CN113945098A - Method for synergistically removing mixed smoke CO and NOx of soot replacement heat accumulating type heating furnace - Google Patents
Method for synergistically removing mixed smoke CO and NOx of soot replacement heat accumulating type heating furnace Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 349
- 239000000779 smoke Substances 0.000 title claims abstract description 342
- 239000004071 soot Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000003034 coal gas Substances 0.000 claims abstract description 160
- 238000002485 combustion reaction Methods 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims description 217
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 207
- 239000007789 gas Substances 0.000 claims description 137
- 230000001172 regenerating effect Effects 0.000 claims description 118
- 239000003245 coal Substances 0.000 claims description 111
- 238000010926 purge Methods 0.000 claims description 22
- 238000010792 warming Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 13
- 238000009825 accumulation Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000002195 synergetic effect Effects 0.000 claims description 7
- 239000000284 extract Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 238000010408 sweeping Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 abstract description 7
- 238000005338 heat storage Methods 0.000 abstract description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 3
- 238000004200 deflagration Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010531 catalytic reduction reaction Methods 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention discloses a method for cooperatively removing mixed smoke CO and NOx of a soot replacement heat storage type heating furnace, which comprises the steps of extracting a replacement medium from self-produced smoke, replacing residual coal gas in a soot shared pipeline into smoke before reversing, and simultaneously replacing the residual coal gas in the soot shared pipeline into a hearth for combustion, so that the problem of component volatility of the soot caused by the diffusion of the residual coal gas and the problem of safety caused by the coal gas in the smoke are solved, then mixing the smoke and air smoke, heating and denitrating the mixed smoke, and finally realizing the cooperative removal of CO and NOx.
Description
Technical Field
The invention belongs to a regenerative heating furnace for reducing CO and NOXThe technical field of emission environment protection, in particular to a method for synergistically removing mixed smoke CO and NOx of a soot replacement regenerative heating furnace.
Background
Regenerative heating furnaces are the most widely used heating furnaces in steel mills. The regenerative heating furnace adopts a working mode of periodic reversing combustion, in the working process, a pipeline between the lower part of a gas reversing valve and a nozzle of a gas regenerative burner is a shared pipeline of gas and hearth smoke (hereinafter referred to as a coal smoke shared pipeline), and the coal smoke is defined as a mixture of the hearth smoke discharged from a gas port of the regenerative heating furnace and the residual periodic discharged gas in the coal smoke shared pipeline during reversing. When the heating furnace is reversed every time, reversing residual gas in the combustion side shared pipeline cannot enter a hearth in time, namely, the reversing residual gas flows in a reverse direction and is discharged into the atmosphere along with hearth smoke, so that the problem of periodic residual gas diffusion of the heat accumulating type heating furnace coal smoke is caused, the residual gas is discharged once every 40-180s by a single gas reversing valve, the heat accumulating type heating furnace is generally provided with 6-60 gas reversing valves, so that the problem of high-frequency severe vibration of smoke exhaust components caused by the fact that the reversing residual gas is diffused is caused, and the oscillation frequency and the vibration amplitude are very high. For example, the residual gas diffusion amount is about 3% -6% of the total gas usage amount, and the residual gas diffusion amount of a single heat accumulating type heating furnace is about 1000-2000 ten thousand meters3The coal gas contains about 22% -60% of CO (the CO concentration is one of the most important environmental air pollutant parameters monitored by the state), according to statistics, the peak value of the CO concentration in the flue gas of the existing heat accumulating type heating furnace is up to 50000-80000ppm, the CO concentration in the flue gas of the heat accumulating type heating furnace is violently vibrated at high frequency between 400ppm and 50000-80000ppm, and the CO is directly discharged into the air, thereby not only wasting a large amount of high-quality energy, but also causing serious pollution to the environment. According to estimation, the regenerative heating furnace in the national iron and steel industry diffuses about 60 hundred million of reversing residual gas every year, and the CO is converted and diffused to be about 2.5 hundred million.
In each process of steel production, except a regenerative steel rolling heating furnace, NO is carried outxUltra low emission abatement, NOxThe discharge concentration reaches a lower level. In the heat accumulating type heating furnace, residual coal gas is periodically diffused, the high-frequency violent oscillation of the smoke components of the soot between the smoke and the coal gas causes the concentration of NOx in the smoke to be 60-300mg/Nm3Random between each otherAnd due to certain delay of SCR denitration ammonia injection detection and regulation equipment, the ammonia injection amount is difficult to realize real-time matching with the amount of the NOx which changes violently in the flue gas, and finally the ammonia escape amount in the flue gas is seriously exceeded. According to experimental tests, after SCR denitration is actually applied to a heat accumulating type heating furnace, if the concentration of NOx is stably achieved to reach the ultralow emission standard, NH in flue gas3The concentration is 5-250mg/Nm3Fluctuation with average value of 80mg/Nm3NH in the smoke gas which is seriously beyond the national standard3Escape concentration is not more than 2.5mg/Nm3Is measured. Therefore, the flue gas components of the regenerative heating furnace vibrate violently at high frequency, the SCR denitration technology is difficult to be applied to the regenerative heating furnace, no good method for removing NOx in the flue gas of the regenerative heating furnace is available in the world and the country, and the national standard only can make the emission standard of the flue gas of the regenerative heating furnace set to be very high (the latest standard is 150 mg/Nm)3)。
The residual gas is periodically diffused, so that huge safety risk exists when soot and air smoke are mixed, and the soot and the air smoke have to be respectively provided with an independent discharge flue, a fan and a chimney, which brings difficulty to the arrangement of a denitration system and also leads to high investment and operation cost.
The problems lead to the serious shortage of the regenerative heating furnace flue gas treatment technology, so that the development of a regenerative heating furnace flue gas treatment technology which has good economical efficiency and can simultaneously reduce the emission of CO and NOxThe novel technology for treating the mixed flue gas of the coal smoke and the air smoke of the regenerative heating furnace has great practical significance.
Disclosure of Invention
Aims to solve the problems of serious overproof of CO and serious NO caused by the diffusion of the reversing residual gas of the regenerative heating furnacexAnd NH3The invention aims to provide a synergistic removal method of mixed smoke CO and NOx of a soot replacement heat accumulating type heating furnace, which can not realize the ultra-low emission standard and has the technical problems of high investment and high running cost of a double-denitration system at the same timeAnd burning, so that the problem of component fluctuation caused by the diffusion of residual gas in the soot is solved, the problem of safety caused by the presence of gas in the smoke is solved, then the smoke and the empty smoke are mixed, then the mixed smoke is subjected to temperature rise and denitration, and finally the CO and NOx are removed in a synergistic manner.
The invention also aims to provide a system for realizing the method for cooperatively removing the mixed smoke CO and the NOx of the soot replacement regenerative heating furnace.
It is another object of the present invention to provide a method of using the above system.
The purpose of the invention is realized by the following technical scheme.
A method for removing CO and NOx in a coordinated manner in a soot replacement heat storage type heating furnace is disclosed, wherein N groups of openings are respectively formed on the left side and the right side of a heat storage type heating furnace 1, each group of openings is 1-2 of air ports and 1-1 of gas ports, and the method for removing CO and NOx in the coordinated manner in the soot replacement heat storage type heating furnace comprises the following steps:
the method comprises the following steps of selecting 1 group of openings on the left side and the right side of the regenerative heating furnace 1 respectively, and repeating the steps from the first step to the fourth step, wherein N groups of openings on each side of the regenerative heating furnace 1 are selected in turn:
firstly, sequentially inputting air and coal gas into a heat accumulating type heating furnace 1 through an air port 1-2 and a coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1, wherein the air and the coal gas are combusted in the heat accumulating type heating furnace 1, and air smoke and smoke gas are discharged from the air port 1-2 and the coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1;
continuously inputting air into the heat accumulating type heating furnace 1 through an air port 1-2 on the right side of the heat accumulating type heating furnace 1, stopping inputting coal gas into the heat accumulating type heating furnace 1 through a coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1, continuously keeping the air port 1-2 on the left side of the heat accumulating type heating furnace 1 discharging air smoke and the coal gas port 1-1 discharging smoke, extracting the smoke discharged by the heat accumulating type heating furnace 1 as a replacement medium, and introducing the smoke into a coal smoke shared pipeline shared by coal gas and hearth smoke communicated with the coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1 to replace reversing residual coal gas in the coal smoke shared pipeline;
and thirdly, stopping inputting the replacement medium into the soot common pipeline on the right side of the regenerative heating furnace 1, and stopping inputting air into the regenerative heating furnace 1 through the air port 1-2 on the right side of the regenerative heating furnace 1. Inputting air and coal gas into the heat accumulating type heating furnace 1 through an air port 1-2 and a coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1, combusting the air and the coal gas in the heat accumulating type heating furnace 1, and discharging air smoke and smoke from the air port 1-2 and the coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1;
continuously inputting air into the heat accumulating type heating furnace 1 through the air port 1-2 on the left side of the heat accumulating type heating furnace 1, stopping inputting coal gas into the heat accumulating type heating furnace 1 through the coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1, continuously keeping the air port 1-2 on the right side of the heat accumulating type heating furnace 1 discharging air smoke and the coal gas port 1-1 discharging smoke, extracting the smoke discharged from the heat accumulating type heating furnace 1 as a replacement medium and introducing the smoke into a coal smoke common pipeline communicated with the coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1 to replace reversing residual coal gas in the smoke;
in the processes of the first step to the fourth step, the following steps are carried out simultaneously:
a) mixing the air smoke discharged from an air port 1-2 of a heat accumulating type heating furnace 1 with the smoke discharged from a gas port 1-1 to form low-temperature non-denitrated mixed smoke;
in the step a), the shared pipeline of the furnace smoke and the residual air discharged from the air port 1-2 of the regenerative heating furnace 1 is an air-smoke shared pipeline, and the air smoke is defined as a mixture of the furnace smoke discharged from the air port 1-2 of the regenerative heating furnace 1 and the air which is periodically discharged and remains in the air-smoke shared pipeline during reversing.
b) The low-temperature non-denitrated mixed flue gas is heated and then enters a denitration device 13 for denitration reaction.
In the step b), the warming includes: and carrying out primary heating and secondary heating on the low-temperature non-denitrated mixed flue gas to form primary heated non-denitrated mixed flue gas, carrying out secondary heating on the primary heated non-denitrated mixed flue gas to form intermediate-temperature non-denitrated mixed flue gas meeting the denitration reaction temperature requirement, and enabling the intermediate-temperature non-denitrated mixed flue gas to enter a denitration device 13 for denitration reaction to form intermediate-temperature denitration mixed flue gas.
In the technical scheme, the first heating is that the low-temperature non-denitrated mixed flue gas and the medium-temperature denitrated mixed flue gas exchange heat.
In the technical scheme, the secondary heating is to mix the primary heated non-denitrated mixed flue gas with the high-temperature air flue gas/high-temperature flue gas.
In the technical scheme, the high-temperature air smoke is obtained by heating part of air smoke discharged from an air port 1-2 of the heat accumulating type heating furnace 1, and the high-temperature smoke is obtained by heating part of smoke discharged from a gas port 1-1 of the heat accumulating type heating furnace 1.
The system for realizing the method for cooperatively removing the mixed smoke CO and the NOx of the soot replacement regenerative heating furnace comprises the following steps: the system comprises a heat accumulating type heating furnace 1, a flue gas mixer 11, a regenerative heat exchanger 15, an air flue gas warming pipeline 16 and a denitration device 13;
for each set of openings: each air port 1-2 is respectively communicated with an air-smoke shared pipeline, the air-smoke shared pipeline is communicated with an air inlet pipeline 2, an air reversing valve 5 is arranged between the air-smoke shared pipeline and the air inlet pipeline 2, each gas port 1-1 is respectively communicated with a soot shared pipeline, the soot shared pipeline is communicated with a gas inlet pipeline 3, a gas reversing valve 4 is arranged between the soot shared pipeline and the gas inlet pipeline 3, and the middle part of each soot shared pipeline is communicated with a replacement branch pipeline 6;
the other ends of all the replacement branch pipelines 6 are communicated with one end of a flue gas replacement pipeline 7, a valve 21 is installed on each replacement branch pipeline 6, the other end of the flue gas replacement pipeline 7 is communicated with the middle of a coal smoke main pipe 9, one end of the coal smoke main pipe 9 and one end of an empty smoke main pipe 10 are both communicated with an air inlet of a flue gas mixer 11, the other end of the coal smoke main pipe 9 is divided into 2 coal smoke branch pipelines 24, the 2 coal smoke branch pipelines 24 are respectively communicated with coal gas reversing valves 4 on two sides of the heat accumulating type heating furnace 1, a replacement induced draft fan 8 is installed on the flue gas replacement pipeline 7, the other end of the empty smoke main pipe 10 is divided into 2 empty smoke branch pipelines 25, and the two empty smoke branch pipelines 25 are respectively communicated with air reversing valves 5 on two sides of the heat accumulating type heating furnace 1; the gas outlet of the flue gas mixer 11 is communicated with the gas inlet of the denitration device 13 through a first gas mixing pipeline 12, the gas outlet of the denitration device 13 is communicated with one end of a second gas mixing pipeline 14 (the other end of the second gas mixing pipeline 14 is connected with a chimney 22), the heat recovery heat exchanger 15 is installed on the first gas mixing pipeline 12 and the second gas mixing pipeline 14 and is used for exchanging heat of gas in the first gas mixing pipeline 12 and the second gas mixing pipeline 14, one end of the air flue gas warming pipeline 16 is communicated with the air flue gas main pipe 10/coal flue gas main pipe 9, the other end of the air flue gas warming pipeline 16 is communicated with the first gas mixing pipeline 12, and the air flue gas warming pipeline 16 is provided with a warming furnace 17 and an air flue gas circulating fan 18.
In the technical scheme, the gas inlet pipeline 3 positioned on the same side of the regenerative heating furnace 1 is communicated with the same pipeline for introducing gas, and the air inlet pipeline 2 positioned on the same side of the regenerative heating furnace 1 is communicated with the same pipeline for introducing air.
In the above technical solution, the method further comprises: the air smoke exhaust pipeline 19 is characterized in that one end of the air smoke exhaust pipeline 19 is communicated with the air smoke main pipe 10, the other end of the air smoke exhaust pipeline 19 is connected with a chimney 22, and an induced draft fan 23 is installed on the air smoke exhaust pipeline 19.
In the above technical solution, the method further comprises: the device comprises a raw coal smoke discharge pipeline 20, wherein one end of the raw coal smoke discharge pipeline 20 is communicated with a coal smoke main pipe 9, the other end of the raw coal smoke discharge pipeline 20 is connected with a chimney 22, and an induced draft fan 23 is installed on the raw coal smoke discharge pipeline 20.
The use method of the system comprises the following steps:
1) closing a valve 21 of a replacement branch pipeline 6 at the left side of the heat accumulating type heating furnace 1, closing the valve 21 of the replacement branch pipeline 6 at the right side of the heat accumulating type heating furnace 1, and respectively inputting air and coal gas into an air port 1-2 and a coal gas port 1-1 at the right side of the heat accumulating type heating furnace 1 through an air inlet pipeline 2 and a coal gas inlet pipeline 3;
adjusting a coal gas reversing valve 4 on the left side of the regenerative heating furnace 1 to disconnect a coal smoke shared pipeline on the left side of the regenerative heating furnace 1 from a coal gas inlet pipeline 3 and communicate the coal smoke shared pipeline with a coal smoke branch pipeline 24; adjusting an air reversing valve 5 on the left side of the regenerative heating furnace 1 to disconnect an air-smoke shared pipeline on the left side of the regenerative heating furnace 1 from an air inlet pipeline 2 and communicate the air-smoke shared pipeline with an air-smoke branch pipeline 25;
2) make the opening of the left and right both sides of heat accumulation formula heating furnace 1 corresponding, each opening on heat accumulation formula heating furnace 1 right side forms a corresponding group rather than the left opening of corresponding heat accumulation formula heating furnace 1, heat accumulation formula heating furnace 1 has N groups to correspond the group, every group corresponds the group and carries out the right side and sweep and the operation that the side carries out the burning switching-over left:
(1) and (3) purging the right side: the coal gas reversing valve 4 on the right side of the heat accumulating type heating furnace 1 is closed to enable no medium to pass through, coal gas is stopped to be input into a coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1 through a coal gas inlet pipeline 3, air is continuously input into an air port 1-2 on the right side of the heat accumulating type heating furnace 1 through an air inlet pipeline 2, a valve 21 of a replacement branch pipeline 6 on the right side of the heat accumulating type heating furnace 1 is opened, a coal smoke common pipeline on the right side of the heat accumulating type heating furnace 1 is communicated with the replacement branch pipeline 6, and a replacement induced draft fan 8 is started; adjusting a coal gas reversing valve 4 on the left side of the heat accumulating type heating furnace 1 to enable a coal smoke shared pipeline to be communicated with a coal smoke branch pipeline 24 and to be disconnected with a coal gas inlet pipeline 3, closing a valve 21 of a replacement branch pipeline 6 on the left side of the heat accumulating type heating furnace 1, and adjusting an air reversing valve 5 on the left side of the heat accumulating type heating furnace 1 to enable an air smoke shared pipeline to be disconnected with an air inlet pipeline 2 and the air smoke shared pipeline to be communicated with an air smoke branch pipeline 25;
(2) and (3) reversing combustion to the left side: closing a valve 21 of the left side replacement branch pipeline 6 of the heat accumulating type heating furnace 1, closing a valve 21 of the right side replacement branch pipeline 6 of the heat accumulating type heating furnace 1, and inputting air and coal gas into an air port 1-2 and a coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1 through an air inlet pipeline 2 and a coal gas inlet pipeline 3;
adjusting a coal gas reversing valve 4 on the right side of the regenerative heating furnace 1 to disconnect a coal smoke shared pipeline on the right side of the regenerative heating furnace 1 from a coal gas inlet pipeline 3 and communicate the coal smoke shared pipeline with a coal smoke branch pipeline 24; adjusting an air reversing valve 5 on the right side of the regenerative heating furnace 1 to disconnect the air-smoke shared pipeline on the right side of the regenerative heating furnace 1 from the air inlet pipeline 2 and communicate the air-smoke shared pipeline with the air-smoke branch pipeline 25;
3) after the operation of right side sweeping and combustion reversing to the left side is carried out, the operation of left side sweeping and combustion reversing to the right side is carried out for 30-180 s:
(1) and (3) purging on the left side:
closing a coal gas reversing valve 4 on the left side of the heat accumulating type heating furnace 1 to enable no medium to pass through, stopping inputting coal gas into a coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1 through a coal gas inlet pipeline 3, continuously inputting air into an air port 1-2 on the left side of the heat accumulating type heating furnace 1 through an air inlet pipeline 2, opening a valve 21 of a replacement branch pipeline 6 on the left side of the heat accumulating type heating furnace 1, enabling a coal smoke shared pipeline on the left side of the heat accumulating type heating furnace 1 to be communicated with the replacement branch pipeline 6, and starting a replacement induced draft fan 8; adjusting a coal gas reversing valve 4 on the right side of the heat accumulating type heating furnace 1 to enable the coal smoke shared pipeline to be communicated with a coal smoke branch pipeline 24 and to be disconnected with a coal gas inlet pipeline 3, closing a valve 21 of a replacement branch pipeline 6 on the right side of the heat accumulating type heating furnace 1, and adjusting an air reversing valve 5 on the right side of the heat accumulating type heating furnace 1 to enable an air smoke shared pipeline to be disconnected with an air inlet pipeline 2 and the air smoke shared pipeline to be communicated with an air smoke branch pipeline 25;
(2) combustion reversing to the right: closing a valve 21 of the replacement branch pipeline 6 at the right side of the regenerative heating furnace 1, closing the valve 21 of the replacement branch pipeline 6 at the left side of the regenerative heating furnace 1, and inputting air and coal gas into an air port 1-2 and a coal gas port 1-1 at the right side of the regenerative heating furnace 1 through an air inlet pipeline 2 and a coal gas inlet pipeline 3;
adjusting a coal gas reversing valve 4 on the left side of the regenerative heating furnace 1 to disconnect a coal smoke shared pipeline on the left side of the regenerative heating furnace 1 from a coal gas inlet pipeline 3 and communicate the coal smoke shared pipeline with a coal smoke branch pipeline 24; adjusting an air reversing valve 5 on the left side of the regenerative heating furnace 1 to disconnect an air-smoke shared pipeline on the left side of the regenerative heating furnace 1 from an air inlet pipeline 2 and communicate the air-smoke shared pipeline with an air-smoke branch pipeline 25;
in the operation processes of the right side blowing, the left side blowing and the right side burning and reversing, the flue gas of the coal flue gas main pipe 9 and the air flue gas of the air flue gas main pipe 10 are converged into the flue gas mixer 11 to be mixed and form low-temperature non-denitrated mixed flue gas, the flue gas mixer 11 feeds the low-temperature non-denitrated mixed flue gas into the first mixed flue pipe 12 and forms medium-temperature denitrated mixed flue gas after being subjected to first heating, second heating and denitration by the denitration device 13, the medium-temperature denitrated mixed flue gas enters the second mixed flue pipe 14 and is subjected to heat exchange with the low-temperature non-denitrated mixed flue gas in the first mixed flue pipe 12 by the heat regenerator 15 to form first heating, the low-temperature non-denitrated mixed flue gas after the heat exchange forms first heating non-denitrated mixed flue gas, and the medium-temperature denitrated mixed flue gas is cooled to form low-temperature denitrated flue gas; the temperature increasing furnace 17 extracts part of the flue gas in the part of the air-flue gas/coal-flue gas main pipe 9 in the air-flue gas main pipe 10 and increases the temperature to form high-temperature air-flue gas/high-temperature flue gas, and the high-temperature air-flue gas/high-temperature flue gas enters the first mixed flue pipe 12 to perform secondary temperature increase on the primary temperature-increased non-denitrated mixed flue gas and form intermediate-temperature non-denitrated mixed flue gas.
In the technical scheme, in the operation processes of the right side purging and the left side combustion reversing and the operation processes of the left side purging and the right side combustion reversing, the coal smoke shared pipeline is communicated/disconnected with the coal smoke branch pipeline 24 or the coal smoke shared pipeline is communicated/disconnected with the coal gas inlet pipeline 3 or the coal gas reversing valve 4 is disconnected and has no medium passing, and the air smoke shared pipeline is communicated/disconnected with the air smoke branch pipeline 25 or the air inlet pipeline 2 is communicated/disconnected with the air smoke shared pipeline through the air reversing valve 5.
In the technical scheme, when air is input into an air port 1-2 of the regenerative heating furnace 1 through an air inlet pipeline 2, the air inlet pipeline 2 is communicated with an air-smoke shared pipeline and the air-smoke shared pipeline is disconnected with an air-smoke branch pipeline 25 through an air reversing valve 5;
when gas is input into the gas port 1-1 of the regenerative heating furnace 1 through the gas inlet pipeline 3, the coal smoke shared pipeline is communicated with the gas inlet pipeline 3 through the gas reversing valve 4 and is disconnected with the coal smoke branch pipeline 24.
The method for synergistically removing the mixed smoke CO and the NOx in the soot replacement heat storage type heating furnace is applied to reducing the high-frequency violent oscillation of smoke components in the denitration process.
The invention has the following beneficial effects:
1. the invention can ensure that the SCR denitration technology can be stably appliedIn the aspect of denitration of the flue gas of the heat accumulating type heating furnace, the invention can realize efficient and synergistic emission reduction of CO and NOx, NOx and NH3The emission concentration can simultaneously reach the ultra-low emission standard of NOx and NH3The escape emission value can reach 20mg/Nm respectively3、2mg/Nm3The following (NOx, NH)3The emission values required by the national environmental protection standard are respectively 150mg/Nm3、3mg/Nm3) The CO concentration in the flue gas can be reduced to below 1100ppm from 25000-55000 ppm. CO and NOx are cooperatively reduced, the harm of atmospheric pollutants to the environment is reduced to the maximum extent, a large amount of high-quality gas fuel is saved, the comprehensive operation cost of the system is reduced, and the purposes of energy conservation and emission reduction are achieved
2. The technology of replacing residual gas by self-produced flue gas is utilized, the flue gas components are stable, the problem of severe high-frequency vibration of the flue gas components caused by high-frequency residual gas diffusion in the flue gas is fundamentally solved, and the phenomenon that ammonia gas seriously escapes because the ammonia injection amount cannot accurately track the flue gas components in real time in the SCR denitration process is thoroughly avoided (when the existing SCR technology is used for a heat accumulating type heating furnace, the highest concentration of the ammonia gas in the flue gas reaches 250mg/Nm3) Therefore, the invention radically solves the technical problem that the ammonia escape concentration of the regenerative heating furnace exceeds the standard periodically, and breaks through the technical problem which puzzles the atmospheric treatment in the steel process for many years.
3. According to the invention, residual coal gas is replaced by self-produced flue gas, so that high-efficiency coal gasification of the soot is realized, then the flue gas and the empty flue gas are combined by the high-efficiency flue gas mixer, and a set of heat exchange, denitration and smoke exhaust device is adopted, so that the problems of large occupied area, large investment and high operating cost of a flue gas and empty flue gas independent double-denitration system are thoroughly solved, the investment is saved by 30%, and the operating cost is reduced by 20%.
4. The mixed flue gas adopts a two-stage heating mode, the first-stage heating heat source is the denitrated medium-temperature mixed flue gas, and the second-stage heating heat source is the hot flue gas generated by a gas heating furnace adopting a low-nitrogen combustion technology. The waste heat is utilized thoroughly, and the system has low heat supplementing energy consumption.
5. After the residual gas replacement technology is adopted, the flue gas only contains a trace amount of CO, so that the danger of deflagration and explosion does not exist, and the safety of a denitration system is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a system in embodiment 2 of the present invention.
Wherein, 1: regenerative heating furnace, 1-1: gas port, 1-2: air port, 2: air intake duct, 3: gas inlet pipe, 4: gas reversing valve, 5: air directional control valve, 6: replacement branch pipe, 7: flue gas replacement pipe, 8: replacement induced draft fan, 9: soot header, 10: empty smoke main, 11: flue gas mixer, 12: first smoke mixing pipe, 13: denitration device, 14: second smoke mixing pipe, 15: regenerative heat exchanger, 16: air-smoke warming pipe, 17: warming furnace, 18: air-smoke circulating fan, 19: raw empty smoke discharge pipe, 20: raw soot discharge pipe, 21: valve, 22: chimney, 23: draught fan, 24: soot branch pipe, 25: empty smoke branch duct, 26: common pipe for soot, 27: the empty smoke shares the pipeline.
Detailed Description
The technical scheme of the invention is further explained by combining specific examples.
Example 1
A method for removing CO and NOx in a mixed smoke manner in a soot replacement heat accumulating type heating furnace in a synergic manner is characterized in that N groups of openings are formed on the left side and the right side of a heat accumulating type heating furnace 1 respectively, heat accumulators (not shown in the figure) are arranged inside the left side and the right side of the heat accumulating type heating furnace 1 respectively, each group of openings are 1 air port 1-2 and 1 gas port 1-1 which are opposite, and the method for removing CO and NOx in the mixed smoke manner in the soot replacement heat accumulating type heating furnace in the synergic manner comprises the following steps:
respectively selecting 1 group of openings on the left side and the right side of the regenerative heating furnace 1, wherein the steps performed after selection comprise repeated steps of (i) - (iv), wherein N groups of openings on each side of the regenerative heating furnace 1 are selected in turn (for one side of the regenerative heating furnace 1: after the first opening on the side is selected, the second opening can be selected after the following steps of (i) - (iv) are completed on the first opening, or simultaneously selected in the steps of (i) - (iv):
firstly, sequentially inputting air and coal gas into a heat accumulating type heating furnace 1 through an air port 1-2 and a coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1, wherein the coal gas and the air are respectively preheated to high temperature by a high-temperature heat accumulator on the side and finally enter a hearth of the heat accumulating type heating furnace 1 for combustion, the air and the coal gas are combusted in the heat accumulating type heating furnace 1 and release heat to a heat accumulator on the left side, the air and the coal gas are combusted in the heat accumulating type heating furnace 1 and exhaust air smoke (the air and the coal gas which are not discharged through a reversing air port during the first operation of the heat accumulating type heating furnace 1 are furnace smoke) and the coal gas is discharged from the coal gas port 1-1;
continuously inputting air into the heat accumulating type heating furnace 1 through an air port 1-2 on the right side of the heat accumulating type heating furnace 1, stopping inputting coal gas into the heat accumulating type heating furnace 1 through a coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1, continuously keeping the air port 1-2 on the left side of the heat accumulating type heating furnace 1 discharging air smoke (the air port 1-2 discharging hearth smoke gas which is not reversed when the heat accumulating type heating furnace 1 operates for the first time) and the coal gas port 1-1 discharging smoke gas, extracting the smoke gas discharged from the heat accumulating type heating furnace 1 as a replacement medium, and introducing the smoke gas into a coal smoke shared pipeline 26 shared by the coal gas communicated with the coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1 and the hearth smoke gas to replace reversed residual coal gas therein;
and thirdly, stopping inputting the replacement medium into the soot common pipeline 26 on the right side of the regenerative heating furnace 1, and stopping inputting air into the regenerative heating furnace 1 through the air port 1-2 on the right side of the regenerative heating furnace 1. Inputting air and coal gas into the regenerative heating furnace 1 through an air port 1-2 and a coal gas port 1-1 on the left side of the regenerative heating furnace 1 (stopping exhausting air smoke from the air port 1-2 and exhausting flue gas from the coal gas port 1-1 on the left side of the regenerative heating furnace 1), combusting the air and the coal gas in the regenerative heating furnace 1, and exhausting the air smoke and the coal gas from the air port 1-2 and the coal gas port 1-1 on the right side of the regenerative heating furnace 1;
continuously inputting air into the heat accumulating type heating furnace 1 through the air port 1-2 on the left side of the heat accumulating type heating furnace 1, stopping inputting coal gas into the heat accumulating type heating furnace 1 through the coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1, continuously keeping the air port 1-2 on the right side of the heat accumulating type heating furnace 1 discharging air smoke and the coal gas port 1-1 discharging smoke, extracting the smoke discharged from the heat accumulating type heating furnace 1 as a replacement medium and introducing the smoke into a coal smoke shared pipeline 26 communicated with the coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1 to replace reversing residual coal gas in the smoke;
in the processes of the first step to the fourth step, the following steps are carried out simultaneously:
a) mixing low-temperature air smoke discharged from an air port 1-2 of a heat accumulating type heating furnace 1 with low-temperature smoke with stable components discharged from a gas port 1-1 to form low-temperature non-denitrated mixed smoke; in the step a), the common duct for the furnace flue gas exhausted from the regenerative heating furnace 1 and the residual air during reversing is an air-flue common duct, and the air flue is defined as a mixture of the furnace flue gas exhausted from the air port 1-2 of the regenerative heating furnace 1 and the residual air periodically exhausted during reversing from the air-flue common duct. (when the step (c) is finished and the step (c) is just started and the step (c) is finished, air periodically discharged appears).
b) The low-temperature non-denitrated mixed flue gas is heated and then enters a denitration device 13 for denitration reaction. The temperature increasing comprises the following steps: and carrying out primary heating and secondary heating on the low-temperature non-denitrated mixed flue gas to form primary heated non-denitrated mixed flue gas, carrying out secondary heating on the primary heated non-denitrated mixed flue gas to form intermediate-temperature non-denitrated mixed flue gas meeting the denitration reaction temperature requirement, and enabling the intermediate-temperature non-denitrated mixed flue gas to enter a denitration device 13 for denitration reaction to form intermediate-temperature denitration mixed flue gas. The first heating is that the low-temperature non-denitrated mixed flue gas and the medium-temperature denitrated mixed flue gas exchange heat. And the second heating is to mix the primary heated non-denitrated mixed flue gas with the high-temperature air flue gas/high-temperature flue gas. The high-temperature air smoke is obtained by heating part of air smoke discharged from an air port 1-2 of the heat accumulating type heating furnace 1, and the high-temperature smoke is obtained by heating part of smoke discharged from a gas port 1-1 of the heat accumulating type heating furnace 1.
The flue gas mainly comprises hearth flue gas, the hearth flue gas is influenced by the replacement time, the longer the replacement time is, the more the hearth flue gas accounts for in the flue gas, generally speaking, if the hearth flue gas is replaced for 3-10s, the flue gas discharged by the heat accumulating type heating furnace may also comprise incompletely-replaced residual coal gas (the content is about 5-10%), but the coal gas accounts for a smaller proportion, and the flue gas components do not cause severe high-frequency oscillation in the subsequent denitration process.
Example 2
As shown in fig. 1, a system for implementing the method for cooperatively removing CO and NOx mixed in a soot replacement regenerative heating furnace in embodiment 1, where N is 2, includes: the system comprises a heat accumulating type heating furnace 1, a flue gas mixer 11, a heat regenerative heat exchanger 15, an air flue gas warming pipeline 16 and a denitration device 13 (an SCR denitration reactor);
for each set of openings: each air port 1-2 is respectively communicated with an air-smoke shared pipeline 27, the air-smoke shared pipeline 27 is communicated with an air inlet pipeline 2, an air reversing valve 5 is arranged between the air-smoke shared pipeline 27 and the air inlet pipeline 2, each gas port 1-1 is respectively communicated with a coal-smoke shared pipeline 26, the coal-smoke shared pipeline 26 is communicated with a gas inlet pipeline 3, a gas reversing valve 4 is arranged between the coal-smoke shared pipeline 26 and the gas inlet pipeline 3, and a replacement branch pipeline 6 is communicated with the middle part of each coal-smoke shared pipeline 26; preferably, the air reversing valve 5 and the gas reversing valve 4 are three-way valves.
The other ends of all the replacement branch pipelines 6 are communicated with one end of a flue gas replacement pipeline 7, a valve 21 is installed on each replacement branch pipeline 6, the other end of the flue gas replacement pipeline 7 is communicated with the middle of a coal smoke main pipe 9, one end of the coal smoke main pipe 9 and one end of an empty smoke main pipe 10 are both communicated with an air inlet of a flue gas mixer 11, the other end of the coal smoke main pipe 9 is divided into 2 coal smoke branch pipelines 24, the 2 coal smoke branch pipelines 24 are respectively communicated with coal gas reversing valves 4 on two sides of the heat accumulating type heating furnace 1 (the 2 coal smoke branch pipelines 24 are respectively communicated with a coal gas reversing valve 4 on one side of the heat accumulating type heating furnace 1), a replacement induced draft fan 8 is installed on the flue gas replacement pipeline 7, the other end of the empty smoke main pipe 10 is divided into 2 empty smoke branch pipelines 25, and the two empty smoke branch pipelines 25 are respectively communicated with air reversing valves 5 on two sides of the heat accumulating type heating furnace 1 (the two empty smoke branch pipelines 25 are respectively communicated with the air reversing valves 5 on one side of the heat accumulating type heating furnace 1) Communication); the gas outlet of the flue gas mixer 11 is communicated with the gas inlet of the denitrator 13 through a first mixed gas pipeline 12, the gas outlet of the denitrator 13 is communicated with one end of a second mixed gas pipeline 14, the heat recovery heat exchanger 15 is installed on the first mixed gas pipeline 12 and the second mixed gas pipeline 14 and is used for exchanging heat for the gas in the first mixed gas pipeline 12 and the second mixed gas pipeline 14, one end of an air flue gas warming pipeline 16 is communicated with an air flue gas main pipe 10/a coal flue gas main pipe 9 (not shown in the figure), the other end of the air flue gas warming pipeline 16 is communicated with the first mixed gas pipeline 12, and a warming furnace 17 and an air flue gas circulating fan 18 are installed on the air flue gas warming pipeline 16.
As a further explanation, the temperature increasing furnace 17 is a generating device for generating high-temperature hot flue gas, the safety of mixed flue gas is unfavorable due to too high flue gas temperature, the flue gas/flue gas adding amount is large when the flue gas temperature is too low, and the consumption of the air flue gas circulating fan 18 is too high. The warming furnace 17 is preferably used for extracting air smoke, and when the warming furnace extracts air smoke, the technical characteristics of the warming furnace are as follows: the flame temperature in the heating furnace is controlled below 1250 ℃, and air smoke is used as a circulating medium air source for flue gas circulation, so that the ultralow nitrogen combustion of the heating furnace is realized. The heating furnace fully utilizes the low-temperature waste heat of the air smoke and O contained in the air smoke2Gas (O in air and smoke)2The concentration is as high as 10-16%), the combustion air consumption of the heating furnace is reduced, and the power consumption of the combustion fan is saved. The heating furnace heats the partial smoke firstly, forms hot smoke lower than the ignition temperature of blast furnace gas, and then mixes the hot smoke with the smoke of the first smoke mixing pipeline 12, so as to ensure that the highest temperature of the mixed smoke does not exceed the ignition temperature, avoid the occurrence of deflagration accidents, and ensure the safe operation of the system.
The gas inlet pipeline 3 positioned on the same side of the regenerative heating furnace 1 is communicated with the same pipeline for introducing gas, and 2 pipelines for introducing gas on two sides of the regenerative heating furnace 1 are introduced with gas by the same gas main pipe. The air inlet pipeline 2 positioned on the same side of the regenerative heating furnace 1 is communicated with the same pipeline for introducing air, and the 2 pipelines for introducing air on the two sides of the regenerative heating furnace 1 are introduced with air by the same air main pipe. The state of the air reversing valve 5, the gas reversing valve 4 and the valve 21 is changed to ensure that the pipelines in the system are connected according to different modes, the air main pipe can be always introduced with air, and the gas main pipe can be always introduced with gas.
Further comprising: the air smoke exhaust pipeline 19 is characterized in that one end of the air smoke exhaust pipeline 19 is communicated with the air smoke main pipe 10, the other end of the air smoke exhaust pipeline 19 is connected with a chimney 22, and an induced draft fan 23 is installed on the air smoke exhaust pipeline 19. Further comprising: the device comprises a raw coal smoke discharge pipeline 20, wherein one end of the raw coal smoke discharge pipeline 20 is communicated with a coal smoke main pipe 9, the other end of the raw coal smoke discharge pipeline 20 is connected with a chimney 22, and an induced draft fan 23 is installed on the raw coal smoke discharge pipeline 20. When the denitration system fails, the original air smoke discharge pipeline 19 and the original coal smoke discharge pipeline 20 are started to maintain the normal operation of the heating furnace.
Example 3
The use method of the system comprises the following steps:
1) closing a valve 21 of a replacement branch pipeline 6 on the left side of the heat accumulating type heating furnace 1, closing the valve 21 of the replacement branch pipeline 6 on the right side of the heat accumulating type heating furnace 1, and respectively inputting air and coal gas into an air port 1-2 and a coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1 through an air inlet pipeline 2 and a coal gas inlet pipeline 3 (inputting air into the air port 1-2 on the right side of the heat accumulating type heating furnace 1 through the air inlet pipeline 2, inputting coal gas into the coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1 through the coal gas inlet pipeline 3, and simultaneously inputting air and coal gas);
adjusting the gas reversing valve 4 on the left side of the regenerative heating furnace 1 to disconnect the coal smoke shared pipeline 26 on the left side of the regenerative heating furnace 1 from the gas inlet pipeline 3 and to communicate the coal smoke shared pipeline 26 with the coal smoke branch pipeline 24; adjusting an air reversing valve 5 on the left side of the regenerative heating furnace 1 to disconnect an air-smoke shared pipeline 27 on the left side of the regenerative heating furnace 1 from an air inlet pipeline 2 and to communicate the air-smoke shared pipeline 27 with an air-smoke branch pipeline 25;
2) make the opening of the left and right both sides of heat accumulation formula heating furnace 1 corresponding, each opening on heat accumulation formula heating furnace 1 right side forms a corresponding group rather than the left opening of corresponding heat accumulation formula heating furnace 1, heat accumulation formula heating furnace 1 has N groups to correspond the group, every group corresponds the group and carries out the right side and sweep and the operation that the side carries out the burning switching-over left:
(1) and (3) purging the right side: the coal gas reversing valve 4 on the right side of the heat accumulating type heating furnace 1 is closed and no medium passes through, namely, the coal gas is stopped to be input into the coal gas port 1-1 on the right side of the heat accumulating type heating furnace 1 through the coal gas inlet pipeline 3, the air is continuously input into the air port 1-2 on the right side of the heat accumulating type heating furnace 1 through the air inlet pipeline 2, the valve 21 of the replacement branch pipeline 6 on the right side of the heat accumulating type heating furnace 1 is opened, the coal smoke common pipeline 26 on the right side of the heat accumulating type heating furnace 1 is communicated with the replacement branch pipeline 6, and the replacement induced draft fan 8 is started; adjusting a coal gas reversing valve 4 on the left side of the regenerative heating furnace 1 to enable a coal smoke shared pipeline 26 to be communicated with a coal smoke branch pipeline 24 and the coal smoke shared pipeline 26 to be disconnected with a coal gas inlet pipeline 3, closing a valve 21 of a replacement branch pipeline 6 on the left side of the regenerative heating furnace 1, and adjusting an air reversing valve 5 on the left side of the regenerative heating furnace 1 to enable an air smoke shared pipeline 27 to be disconnected with an air inlet pipeline 2 and the air smoke shared pipeline 27 to be communicated with an air smoke branch pipeline 25; the replacement induced draft fan 8 extracts flue gas as a gas replacement medium, and residual gas is blown into a hearth of the heat accumulating type heating furnace 1 through the replacement flue gas replacement pipeline 7, the replacement branch pipeline 6 (right side) and the coal-smoke shared pipeline 26 (right side), so that residual gas removal, CO emission reduction and residual gas replacement are realized.
The replacement system extracts part of low-temperature flue gas in the heat accumulating type heating furnace 1 as a replacement medium to replace residual coal gas before reversing the heat accumulating type heating furnace 1, and the residual coal gas is blown into the heat accumulating type heating furnace 1 to be combusted, so that the coal gas is prevented from being directly diffused into the atmosphere, and CO emission reduction is realized. After the reversing residual gas is removed, the residual gas in the soot shared pipeline 26 is replaced by the flue gas, the components of the flue gas treated by adopting the residual gas replacement technology do not have the problem of high-frequency violent oscillation between the flue gas and the gas any more, the components are very stable, the problem of large fluctuation of the soot components is fundamentally eliminated, and meanwhile, the risk of gas deflagration is eliminated after the residual gas is eliminated.
(2) And (3) reversing combustion to the left side: closing a valve 21 of the left side replacement branch pipeline 6 of the heat accumulating type heating furnace 1, closing a valve 21 of the right side replacement branch pipeline 6 of the heat accumulating type heating furnace 1, and inputting air and coal gas into an air port 1-2 and a coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1 through an air inlet pipeline 2 and a coal gas inlet pipeline 3; (air is input into an air port 1-2 at the left side of the regenerative heating furnace 1 through an air inlet pipeline 2, coal gas is input into a coal gas port 1-1 at the left side of the regenerative heating furnace 1 through a coal gas inlet pipeline 3, and the air and the coal gas are input simultaneously);
adjusting the coal gas reversing valve 4 on the right side of the regenerative heating furnace 1 to disconnect the coal smoke common pipeline 26 on the right side of the regenerative heating furnace 1 from the coal gas inlet pipeline 3 and to communicate the coal smoke common pipeline 26 with the coal smoke branch pipeline 24; adjusting an air reversing valve 5 on the right side of the regenerative heating furnace 1 to disconnect an air-smoke shared pipeline 27 on the right side of the regenerative heating furnace 1 from the air inlet pipeline 2 and to communicate the air-smoke shared pipeline 27 with the air-smoke branch pipeline 25;
3) after the operation of right side purging and left side combustion reversing is carried out, the operation of left side purging and right side combustion reversing is carried out after 30-180 s (combustion period):
(1) and (3) purging on the left side:
the coal gas reversing valve 4 on the left side of the heat accumulating type heating furnace 1 is closed and no medium passes through, namely, the coal gas is stopped to be input into the coal gas port 1-1 on the left side of the heat accumulating type heating furnace 1 through the coal gas inlet pipeline 3, the air is continuously input into the air port 1-2 on the left side of the heat accumulating type heating furnace 1 through the air inlet pipeline 2, the valve 21 of the replacement branch pipeline 6 on the left side of the heat accumulating type heating furnace 1 is opened, the coal smoke shared pipeline 26 on the left side of the heat accumulating type heating furnace 1 is communicated with the replacement branch pipeline 6, and the replacement induced draft fan 8 is started; adjusting a coal gas reversing valve 4 on the right side of the regenerative heating furnace 1 to enable a coal smoke shared pipeline 26 to be communicated with a coal smoke branch pipeline 24 and the coal smoke shared pipeline 26 to be disconnected with a coal gas inlet pipeline 3, closing a valve 21 of a replacement branch pipeline 6 on the right side of the regenerative heating furnace 1, and adjusting an air reversing valve 5 on the right side of the regenerative heating furnace 1 to enable an air smoke shared pipeline 27 to be disconnected with an air inlet pipeline 2 and the air smoke shared pipeline 27 to be communicated with an air smoke branch pipeline 25;
(2) combustion reversing to the right: closing a valve 21 of the replacement branch pipeline 6 at the right side of the regenerative heating furnace 1, closing the valve 21 of the replacement branch pipeline 6 at the left side of the regenerative heating furnace 1, and inputting air and coal gas into an air port 1-2 and a coal gas port 1-1 at the right side of the regenerative heating furnace 1 through an air inlet pipeline 2 and a coal gas inlet pipeline 3;
adjusting the gas reversing valve 4 on the left side of the regenerative heating furnace 1 to disconnect the coal smoke shared pipeline 26 on the left side of the regenerative heating furnace 1 from the gas inlet pipeline 3 and to communicate the coal smoke shared pipeline 26 with the coal smoke branch pipeline 24; the air change valve 5 on the left side of the regenerative heating furnace 1 is adjusted so that the air-smoke common duct 27 on the left side of the regenerative heating furnace 1 is disconnected from the air intake duct 2 and the air-smoke common duct 27 is communicated with the air-smoke branch duct 25.
During the operation of the right side purge and the operation of the combustion reversal to the left side and the operation of the left side purge and the operation of the combustion reversal to the right side, the flue gas of the coal flue gas main pipe 9 and the air flue gas of the air flue gas main pipe 10 are converged into a flue gas mixer 11 to be mixed and form low-temperature non-denitrated mixed flue gas, the flue gas mixer 11 introduces the low-temperature non-denitrated mixed flue gas into a first mixed flue gas pipe 12 and forms medium-temperature denitrated mixed flue gas after being subjected to first heating, second heating and denitration by a denitration device 13, the medium-temperature denitrated mixed flue gas enters a second mixed flue gas pipe 14 and is subjected to heat exchange with the low-temperature non-denitrated mixed flue gas in the first mixed flue gas pipe 12 through a regenerative heat exchanger 15 to form first heating, the low-temperature non-denitrated mixed flue gas after the heat exchange forms first heating non-denitrated mixed flue gas, and the medium-temperature denitrated mixed flue gas is cooled to form low-temperature denitrated flue gas (the temperature is the flue gas discharge temperature); the temperature increasing furnace 17 extracts part of the flue gas in the part of the air-flue gas/coal-flue gas main pipe 9 in the air-flue gas main pipe 10 and increases the temperature to form high-temperature air-flue gas/high-temperature flue gas, and the high-temperature air-flue gas/high-temperature flue gas enters the first mixed flue pipe 12 to perform secondary temperature increase on the primary temperature-increased non-denitrated mixed flue gas and form intermediate-temperature non-denitrated mixed flue gas. The quantity of air smoke extracted from the air smoke main pipe 10 by the temperature increasing furnace 17 is determined by the SCR denitration catalysis temperature, and the heat distribution proportion of the first temperature increase and the second temperature increase is determined according to the specific conditions of the regenerative heating furnace. The denitration device 13 can be low-temperature catalysis or medium-temperature catalysis, the flue gas temperature requirement before denitration is not lower than the denitration reaction temperature required by the catalyst, and the mixed flue gas meets the denitration requirement after secondary temperature rise. The SCR denitration process is essentially a chemical process for selective catalytic reduction of NOx.
The multiple groups of corresponding groups of the regenerative heating furnace 1 alternately perform the operations of right-side purging and left-side purging and combustion reversing to the right side, and generally, the latter corresponding group may start the operations of right-side purging and combustion reversing to the left side and the operations of left-side purging and combustion reversing to the right side when the former corresponding group is finished or not finished, but simultaneously allow the multiple groups of corresponding groups (the number of the corresponding groups does not exceed 60% of the total number of the corresponding groups) to simultaneously perform the same action.
As a further explanation, during the operation of the right-side purge and the operation of the combustion reversal to the left side and the operation of the left-side purge and the operation of the combustion reversal to the right side, the coal and smoke shared line 26 is connected/disconnected with the coal and smoke branch line 24 or the coal and smoke shared line 26 is connected/disconnected with the gas inlet line 3 or the gas reversal valve 4 is closed to pass no medium, and the air and smoke shared line 27 is connected/disconnected with the air and smoke branch line 25 or the air inlet line 2 is connected/disconnected with the air and smoke shared line 27 through the air reversal valve 5.
As a further explanation, when air is supplied into the air port 1-2 of the regenerative heating furnace 1 through the air intake duct 2, the air intake duct 2 is made to communicate with the air-smoke shared duct 27 through the air direction changing valve 5 (the air-smoke shared duct 27 is disconnected from the air-smoke branch duct 25); when gas is input into the gas port 1-1 of the regenerative heating furnace 1 through the gas inlet pipeline 3, the coal smoke common pipeline 26 is communicated with the gas inlet pipeline 3 through the gas reversing valve 4 (the coal smoke common pipeline 26 is disconnected with the coal smoke branch pipeline 24).
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. A method for removing CO and NOx in a coordinated manner in a soot replacement heat accumulating type heating furnace is characterized in that the method for removing CO and NOx in a coordinated manner in a soot replacement heat accumulating type heating furnace comprises the following steps:
the method comprises the following steps of selecting 1 group of openings on the left side and the right side of the regenerative heating furnace (1), and repeating the steps from the first step to the fourth step, wherein N groups of openings on each side of the regenerative heating furnace (1) are selected in turn:
sequentially inputting air and coal gas into the heat accumulating type heating furnace (1) through an air port (1-2) and a coal gas port (1-1) on the right side of the heat accumulating type heating furnace (1), wherein the air and the coal gas are combusted in the heat accumulating type heating furnace (1) and the air smoke and the flue gas are discharged from the air port (1-2) on the left side of the heat accumulating type heating furnace (1);
continuously inputting air into the heat accumulating type heating furnace (1) through an air port (1-2) on the right side of the heat accumulating type heating furnace (1), stopping inputting coal gas into the heat accumulating type heating furnace (1) through a coal gas port (1-1) on the right side of the heat accumulating type heating furnace (1), continuously keeping the air port (1-2) on the left side of the heat accumulating type heating furnace (1) to discharge air smoke and the coal gas port (1-1) to discharge smoke, extracting the smoke discharged by the heat accumulating type heating furnace (1) as a replacement medium, and introducing the smoke into a coal smoke shared pipeline (26) shared by coal gas communicated with the coal gas port (1-1) on the right side of the heat accumulating type heating furnace (1) and hearth smoke so as to replace reversing residual coal gas in the smoke;
thirdly, inputting a replacement medium into the coal and smoke shared pipeline (26) on the right side of the heat accumulating type heating furnace (1), stopping inputting air into the heat accumulating type heating furnace (1) through the air port (1-2) on the right side of the heat accumulating type heating furnace (1), inputting air and coal gas into the heat accumulating type heating furnace (1) through the air port (1-2) on the left side of the heat accumulating type heating furnace (1) and the coal gas port (1-1), combusting the air and the coal gas in the heat accumulating type heating furnace (1), and discharging the air smoke and the coal gas from the air port (1-2) on the right side of the heat accumulating type heating furnace (1);
continuously inputting air into the heat accumulating type heating furnace (1) through an air port (1-2) on the left side of the heat accumulating type heating furnace (1), stopping inputting coal gas into the heat accumulating type heating furnace (1) through a coal gas port (1-1) on the left side of the heat accumulating type heating furnace (1), continuously keeping the air port (1-2) on the right side of the heat accumulating type heating furnace (1) to discharge air smoke and the coal gas port (1-1) to discharge smoke, extracting the smoke discharged by the heat accumulating type heating furnace (1) as a replacement medium, and introducing the smoke into a coal smoke shared pipeline (26) communicated with the coal gas port (1-1) on the left side of the heat accumulating type heating furnace (1) to replace reversing residual coal gas in the smoke;
in the processes of the first step to the fourth step, the following steps are carried out simultaneously:
a) mixing air smoke discharged from an air port (1-2) of a heat accumulating type heating furnace (1) with smoke discharged from a gas port (1-1) to form low-temperature non-denitrated mixed smoke;
b) the low-temperature non-denitrated mixed flue gas is heated and then enters a denitration device (13) for denitration reaction.
2. The method for the synergistic removal of CO and NOx mixed with flue gas of a soot replacement regenerative furnace according to claim 1, wherein in the step a), the common duct for furnace flue gas and residual air exhausted from the regenerative furnace (1) is a common duct for empty flue gas (27), and the empty flue gas is defined as a mixture of furnace flue gas exhausted from the air port (1-2) of the regenerative furnace (1) and air which is periodically exhausted and remained in the common duct for empty flue gas (27) during the reversal;
in the step b), the warming includes: the method comprises the steps of carrying out primary heating and secondary heating on low-temperature non-denitration mixed flue gas to form primary heated non-denitration mixed flue gas, carrying out secondary heating on the primary heated non-denitration mixed flue gas to form intermediate-temperature non-denitration mixed flue gas meeting the denitration reaction temperature requirement, and enabling the intermediate-temperature non-denitration mixed flue gas to enter a denitration device (13) to carry out denitration reaction to form intermediate-temperature denitration mixed flue gas.
3. The method for synergistically removing CO and NOx from mixed smoke of a soot replacement regenerative heating furnace according to claim 1, wherein the first temperature rise is a heat exchange between low-temperature non-denitrated mixed smoke and medium-temperature denitrated mixed smoke; and the second heating is to mix the primary heated non-denitrated mixed flue gas with the high-temperature air flue gas/high-temperature flue gas.
4. The method for removing CO and NOx in a coordinated manner by using soot to replace regenerative heating furnace according to claim 3, wherein the high-temperature air smoke is obtained by heating a part of air smoke discharged from an air port (1-2) of the regenerative heating furnace (1), and the high-temperature smoke is obtained by heating a part of smoke discharged from a gas port (1-1) of the regenerative heating furnace (1).
5. The system for realizing the method for the synergistic removal of the mixed smoke CO and the NOx in the soot replacement regenerative heating furnace according to claim 1 is characterized by comprising the following steps of: the system comprises a heat accumulating type heating furnace (1), a flue gas mixer (11), a regenerative heat exchanger (15), an air flue gas warming pipeline (16) and a denitration device (13);
for each set of openings: each air port (1-2) is communicated with an air-smoke shared pipeline (27), the air-smoke shared pipeline (27) is communicated with an air inlet pipeline (2), an air reversing valve (5) is arranged between the air-smoke shared pipeline (27) and the air inlet pipeline (2), each gas port (1-1) is communicated with a coal-smoke shared pipeline (26), the coal-smoke shared pipeline (26) is communicated with a gas inlet pipeline (3), a gas reversing valve (4) is arranged between the coal-smoke shared pipeline (26) and the gas inlet pipeline (3), and the middle part of each coal-smoke shared pipeline (26) is communicated with a replacement branch pipeline (6);
the other ends of all the replacement branch pipelines (6) are communicated with one end of a flue gas replacement pipeline (7), each replacement branch pipeline (6) is provided with a valve (21), the other end of the smoke replacement pipeline (7) is communicated with the middle part of a soot main pipe (9), one end of the soot main pipe (9) and one end of an empty smoke main pipe (10) are both communicated with an air inlet of a smoke mixer (11), the other end of the soot main pipe (9) is divided into 2 soot branch pipelines (24), the 2 soot branch pipelines (24) are respectively communicated with coal gas reversing valves (4) on two sides of a heat accumulating type heating furnace (1), a replacement induced draft fan (8) is installed on the flue gas replacement pipeline (7), the other end of the main air flue gas pipeline (10) is divided into 2 main air flue gas branch pipelines (25), and the two main air flue gas branch pipelines (25) are respectively communicated with air reversing valves (5) on two sides of the regenerative heating furnace (1); the gas outlet of the flue gas mixer (11) is communicated with the gas inlet of the denitration device (13) through a first gas mixing pipeline (12), the gas outlet of the denitration device (13) is communicated with one end of a second gas mixing pipeline (14), the heat recovery heat exchanger (15) is installed on the first gas mixing pipeline (12) and the second gas mixing pipeline (14) and is used for exchanging heat of gas in the first gas mixing pipeline (12) and the second gas mixing pipeline (14), one end of the air flue gas heating pipeline (16) is communicated with the air flue gas main pipe (10) and/or the coal flue gas main pipe (9), the other end of the air flue gas heating pipeline (16) is communicated with the first gas mixing pipeline (12), and the air flue gas heating pipeline (16) is provided with a heating furnace (17) and an air flue gas circulating fan (18).
6. The system according to claim 5, characterized in that the gas inlet ducts (3) located on the same side of the regenerative heating furnace (1) are in communication with the same duct for introducing gas, and the air inlet ducts (2) located on the same side of the regenerative heating furnace (1) are in communication with the same duct for introducing air.
7. The system of claim 5, further comprising: the device comprises a raw air smoke discharge pipeline (19), wherein one end of the raw air smoke discharge pipeline (19) is communicated with an air smoke main pipe (10), the other end of the raw air smoke discharge pipeline (19) is connected with a chimney (22), and an induced draft fan (23) is installed on the raw air smoke discharge pipeline (19);
further comprising: the device comprises a raw coal smoke discharge pipeline (20), wherein one end of the raw coal smoke discharge pipeline (20) is communicated with a coal smoke main pipe (9), the other end of the raw coal smoke discharge pipeline (20) is connected with a chimney (22), and an induced draft fan (23) is installed on the raw coal smoke discharge pipeline (20).
8. The method of using the system of claim 5, comprising:
1) closing a valve (21) of a replacement branch pipeline (6) at the left side of the heat accumulating type heating furnace (1), closing a valve (21) of the replacement branch pipeline (6) at the right side of the heat accumulating type heating furnace (1), and respectively inputting air and coal gas into an air port (1-2) and a coal gas port (1-1) at the right side of the heat accumulating type heating furnace (1) through an air inlet pipeline (2) and a coal gas inlet pipeline (3);
adjusting a coal gas reversing valve (4) on the left side of the heat accumulating type heating furnace (1) to disconnect a coal smoke shared pipeline (26) on the left side of the heat accumulating type heating furnace (1) from a coal gas inlet pipeline (3) and connect the coal smoke shared pipeline (26) with a coal smoke branch pipeline (24); adjusting an air reversing valve (5) on the left side of the heat accumulating type heating furnace (1) to disconnect an air and smoke shared pipeline (27) on the left side of the heat accumulating type heating furnace (1) from an air inlet pipeline (2) and connect the air and smoke shared pipeline (27) with an air and smoke branch pipeline (25);
2) make the opening of the left and right both sides of heat accumulation formula heating furnace (1) corresponding, each opening on heat accumulation formula heating furnace (1) right side forms a corresponding group rather than the left opening of corresponding heat accumulation formula heating furnace (1), heat accumulation formula heating furnace (1) has N to organize and corresponds the group, every group corresponds the group and carries out the right side and sweep and carry out the operation that the burning was commuted to the left side:
(1) and (3) purging the right side: closing a coal gas reversing valve (4) on the right side of the heat accumulating type heating furnace (1) to enable no medium to pass through, continuously inputting air to an air port (1-2) on the right side of the heat accumulating type heating furnace (1) through an air inlet pipeline (2), opening a valve (21) of a replacement branch pipeline (6) on the right side of the heat accumulating type heating furnace (1), enabling a coal and smoke shared pipeline (26) on the right side of the heat accumulating type heating furnace (1) to be communicated with the replacement branch pipeline (6), and starting a replacement induced draft fan (8); adjusting a coal gas reversing valve (4) on the left side of the heat accumulating type heating furnace (1) to enable a coal smoke shared pipeline (26) to be communicated with a coal smoke branch pipeline (24) and the coal smoke shared pipeline (26) to be disconnected with a coal gas inlet pipeline (3), closing a valve (21) of a replacement branch pipeline (6) on the left side of the heat accumulating type heating furnace (1), and adjusting an air reversing valve (5) on the left side of the heat accumulating type heating furnace (1) to enable an air smoke shared pipeline (27) to be disconnected with an air inlet pipeline (2) and the air smoke shared pipeline (27) to be communicated with an air smoke branch pipeline (25);
(2) and (3) reversing combustion to the left side: closing a valve (21) of a replacement branch pipeline (6) at the left side of the heat accumulating type heating furnace (1), closing a valve (21) of the replacement branch pipeline (6) at the right side of the heat accumulating type heating furnace (1), and inputting air and coal gas into an air port (1-2) and a coal gas port (1-1) at the left side of the heat accumulating type heating furnace (1) through an air inlet pipeline (2) and a coal gas inlet pipeline (3);
adjusting a coal gas reversing valve (4) on the right side of the regenerative heating furnace (1) to disconnect a coal smoke shared pipeline (26) on the right side of the regenerative heating furnace (1) from a coal gas inlet pipeline (3) and connect the coal smoke shared pipeline (26) with a coal smoke branch pipeline (24); adjusting an air reversing valve (5) on the right side of the regenerative heating furnace (1) to disconnect an air and smoke shared pipeline (27) on the right side of the regenerative heating furnace (1) from an air inlet pipeline (2) and connect the air and smoke shared pipeline (27) with an air and smoke branch pipeline (25);
3) after the operation of right side sweeping and combustion reversing to the left side is carried out, the operation of left side sweeping and combustion reversing to the right side is carried out for 30-180 s:
(1) and (3) purging on the left side:
closing a coal gas reversing valve (4) on the left side of the heat accumulating type heating furnace (1) to enable no medium to pass through, continuously inputting air to an air port (1-2) on the left side of the heat accumulating type heating furnace (1) through an air inlet pipeline (2), opening a valve (21) of a replacement branch pipeline (6) on the left side of the heat accumulating type heating furnace (1), enabling a coal and smoke shared pipeline (26) on the left side of the heat accumulating type heating furnace (1) to be communicated with the replacement branch pipeline (6), and starting a replacement induced draft fan (8); adjusting a coal gas reversing valve (4) on the right side of the heat accumulating type heating furnace (1) to enable a coal smoke shared pipeline (26) to be communicated with a coal smoke branch pipeline (24) and the coal smoke shared pipeline (26) to be disconnected with a coal gas inlet pipeline (3), closing a valve (21) of a replacement branch pipeline (6) on the right side of the heat accumulating type heating furnace (1), and adjusting an air reversing valve (5) on the right side of the heat accumulating type heating furnace (1) to enable an air smoke shared pipeline (27) to be disconnected with an air inlet pipeline (2) and the air smoke shared pipeline (27) to be communicated with an air smoke branch pipeline (25);
(2) combustion reversing to the right: closing a valve (21) of a replacement branch pipeline (6) at the right side of the regenerative heating furnace (1), closing a valve (21) of the replacement branch pipeline (6) at the left side of the regenerative heating furnace (1), and inputting air and coal gas into an air port (1-2) and a coal gas port (1-1) at the right side of the regenerative heating furnace (1) through an air inlet pipeline (2) and a coal gas inlet pipeline (3);
adjusting a coal gas reversing valve (4) on the left side of the heat accumulating type heating furnace (1) to disconnect a coal smoke shared pipeline (26) on the left side of the heat accumulating type heating furnace (1) from a coal gas inlet pipeline (3) and connect the coal smoke shared pipeline (26) with a coal smoke branch pipeline (24); adjusting an air reversing valve (5) on the left side of the heat accumulating type heating furnace (1) to disconnect an air and smoke shared pipeline (27) on the left side of the heat accumulating type heating furnace (1) from an air inlet pipeline (2) and connect the air and smoke shared pipeline (27) with an air and smoke branch pipeline (25);
during the operation of the right side purge and the operation of the combustion reversal to the left side and the operation of the left side purge and the operation of the combustion reversal to the right side, the method comprises the following steps that flue gas of a coal smoke main pipe (9) and air smoke of an air smoke main pipe (10) are converged into a flue gas mixer (11) to be mixed to form low-temperature non-denitration mixed flue gas, the low-temperature non-denitration mixed flue gas is introduced into a first mixed flue pipe (12) by the flue gas mixer (11) and is subjected to first temperature rise, second temperature rise and denitration by a denitration device (13) to form medium-temperature denitration mixed flue gas, the medium-temperature denitration mixed flue gas enters a second mixed flue pipe (14) and is subjected to heat exchange with the low-temperature non-denitration mixed flue gas in the first mixed flue pipe (12) through a heat recovery heat exchanger (15) to form first temperature rise, the low-temperature non-denitration mixed flue gas after heat exchange forms first temperature rise non-denitration mixed flue gas, and the medium-temperature denitration mixed flue gas is cooled to form low-temperature denitration flue gas; the heating furnace (17) extracts part of flue gas in a part of air flue gas/coal flue gas main pipe (9) in the air flue gas main pipe (10) and heats the part of flue gas to form high-temperature air flue gas/high-temperature flue gas, and the high-temperature air flue gas/high-temperature flue gas enters the first flue gas mixing pipe (12) to carry out secondary heating on the primary heated non-denitrated mixed flue gas and form medium-temperature non-denitrated mixed flue gas.
9. The method of use according to claim 8, characterized in that during the operation of the right-hand purge and the operation of the combustion reversal to the left and the operation of the left-hand purge and the operation of the combustion reversal to the right, the common soot duct (26) is connected/disconnected to/from the branch soot duct (24) or the common soot duct (26) is connected/disconnected to/from the gas inlet duct (3) or the gas reversal valve (4) is disconnected from the medium passage, and the common air-smoke duct (27) is connected/disconnected to/from the branch air-smoke duct (25) or the air inlet duct (2) is connected/disconnected from the common air-smoke duct (27) by the air reversal valve (5).
10. Use according to claim 8, characterized in that when air is fed into the air ports (1-2) of the regenerative heating furnace (1) through the air inlet duct (2), the air inlet duct (2) is connected to the air-smoke common duct (27) and the air-smoke common duct (27) is disconnected from the air-smoke branch duct (25) by means of the air diverter valve (5);
when gas is input into a gas port (1-1) of the regenerative heating furnace (1) through a gas inlet pipeline (3), a coal smoke shared pipeline (26) is communicated with the gas inlet pipeline (3) through a gas reversing valve (4), and the coal smoke shared pipeline (26) is disconnected with a coal smoke branch pipeline (24).
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