CN101839474B - Method for re-circulating combustion of flue gas of pulverized coal fired boiler - Google Patents
Method for re-circulating combustion of flue gas of pulverized coal fired boiler Download PDFInfo
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- CN101839474B CN101839474B CN2010102048825A CN201010204882A CN101839474B CN 101839474 B CN101839474 B CN 101839474B CN 2010102048825 A CN2010102048825 A CN 2010102048825A CN 201010204882 A CN201010204882 A CN 201010204882A CN 101839474 B CN101839474 B CN 101839474B
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- flue gas
- burner hearth
- temperature flue
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention provides a method for re-circulating combustion of flue gas of a pulverized coal fired boiler, belongs to a method for circulating combustion of oxygen gas (O2) and carbon dioxide (CO2) of pulverized coal, and aims to solve the problems of low heat efficiency and poor burn-out property existing in the conventional combustion method. The method comprises the steps of: 1,igniting and combusting: conveying the pulverized coal to a furnace hearth by using the circulation flue gas, and simultaneously conveying O2 to the furnace hearth for ignition; 2, circulating the flue gas: dividing the high-temperature flue gas generated by combustion into two parts, and performing cooling, dust removal and desulfurization compression on the first part to obtain liquid CO2; dividing the second part into two paths, conveying the first path to an entrance of the furnace hearth by using a high-temperature circulation fan, and mixing the first path of the flue gas and O2; and performing cooling, dust removal and desulfurization on the second path, and conveying the second path carrying the pulverized coal to the furnace hearth by using a cold circulation fan. The method has the advantages of adjusting the steam temperature of the boiler by using the high-temperature flue gas, enhancing convective heat transfer, increasing the steam temperature of the boiler, improving the heat efficiency of the boiler and the denitration rate, increasing the CO2 content after the high-temperature flue gas is cooled, reducing emission load of NOx, lowering CO2 capturing and collecting cost, and meeting the national energy conservation and environmental protection standard.
Description
Technical field
The invention belongs to coal dust O
2And CO
2The circulating combustion method is specifically related to a kind of method for re-circulating combustion of flue gas of pulverized coal fired boiler, is used for power industry CO
2Reduction of discharging and NOx and SOx remove, and improve pulverized-coal fired boiler efficient simultaneously.
Background technology
Coal dust O
2And CO
2The circulating combustion method is a kind of enrichment CO2, reduces carbon emission, also can not only make separated and collected CO to the novel clean combustion technology of pollution that caused by coal burning thing cooperation-removal simultaneously
2, can also reduce the NOx discharging, make things convenient for treatment S O
2Various CO in thermal power plant
2Reduce discharging in the control method, can carry out scale and reduce discharging, Technological Economy is better, and application potential is bigger, obtains the attention of international and domestic research, the research of its technology is also become a big focus of energy industry.Be provided with superheater, reheater, economizer and air preheater successively in the burner hearth rear portion flue of coal-burning boiler, existing coal dust O
2And CO
2The circulating combustion method is applied to coal-burning boiler, comprises ignition step and flue gas recirculation step, the ignition step: utilize cold circulating flue gas to the burner hearth pulverized coal conveying, simultaneously, with O that separation of air obtains
2Send into burner hearth, ignition; The flue gas recirculation step: the flue gas that produces behind the coal dust firing in the burner hearth is after supercooling, dedusting, desulfurization are handled, wherein a part of cooled flue gas is as cold circulating flue gas, cold circulating flue gas is separated into two parts again, and first's cooled flue gas is sent the burner hearth inlet back to by circulating fan; The second portion cooled flue gas is carried coal dust and is sent into burner hearth.Because what adopt is cold flue gas recirculation, from the angle of the thermal efficiency, flue gas is through supercooling, and the temperature that enters burner hearth is low, and the generating efficiency of system is low; Also there are problems such as burnout rate is bad in combustion process.
Summary of the invention
The invention provides a kind of method for re-circulating combustion of flue gas of pulverized coal fired boiler, solve existing coal dust O
2And CO
2The problem that the circulating combustion method thermal efficiency is low, burnout rate is bad.
A kind of method for re-circulating combustion of flue gas of pulverized coal fired boiler of the present invention is applied to pulverized-coal fired boiler, comprises ignition step and flue gas recirculation step successively, is provided with superheater, reheater, economizer and air preheater successively in the burner hearth rear portion flue of pulverized-coal fired boiler; It is characterized in that:
The ignition step: utilize circulating flue gas to the burner hearth pulverized coal conveying, simultaneously, with O that separation of air obtains
2Send into burner hearth, ignition;
The flue gas recirculation step: the high-temperature flue gas that produces behind the coal dust firing in the burner hearth is divided into two parts, and first's high-temperature flue gas recompresses into liquid CO after supercooling, dedusting, desulfurization
2The second portion high-temperature flue gas is as circulating flue gas;
The second portion high-temperature flue gas is further divided into two-way: first via high-temperature flue gas is sent into the burner hearth inlet by the high temperature circulation blower fan, with O
2Enter burner hearth after the mixing; The second road high-temperature flue gas carries coal dust by cold circulating fan and sends into burner hearth after supercooling, dedusting and desulfurization.
Described method for re-circulating combustion of flue gas of pulverized coal fired boiler is characterized in that:
The volume ratio of first's high-temperature flue gas and second portion high-temperature flue gas is 3: 7～6: 4;
The volume ratio of the described first via high-temperature flue gas and the second road high-temperature flue gas is 6: 4～8: 2;
Described flue gas recirculation step enters the O of burner hearth
2With the volume ratio of second portion high-temperature flue gas be 3: 7～2.8: 7.2.
Described method for re-circulating combustion of flue gas of pulverized coal fired boiler is characterized in that:
In the described flue gas recirculation step, first via high-temperature flue gas is extracted out from the economizer rear portion in the flue of burner hearth rear portion, sends the burner hearth inlet back to by the high temperature circulation blower fan.
The present invention recycles with the economizer rear portion high-temperature flue gas in the burner hearth back-end ductwork and regulates Steam Temperature for Boiler, with O
2/ CO
2Circulating combustion and high-temperature flue gas recycle burning combine, because the rising of furnace outlet gas temperature has strengthened convection heat transfer' heat-transfer by convection, thereby improve Steam Temperature for Boiler.Compare with the tradition burning, boiler thermal output is increased to 98% from 89%; The NOx discharge capacity is reduced to 2500mg/kg coal from 5250mg/kg coal, and the denitration rate has improved 75% than traditional combustion; Simultaneously, improve the cooled CO of first's high-temperature flue gas
2Content makes CO in the flue gas
2Concentration reduces CO up to more than 91%
2Catch and compiling costs; Reach national energy-conserving and environment-protective standard.
Description of drawings
Fig. 1 is a schematic flow sheet of the present invention;
The specific embodiment
As shown in Figure 1, the present invention comprises ignition step and flue gas recirculation step successively,
The ignition step: utilize circulating flue gas to the burner hearth pulverized coal conveying, simultaneously, with O that separation of air obtains
2Send into burner hearth, ignition;
The flue gas recirculation step: the high-temperature flue gas that produces behind the coal dust firing in the burner hearth is divided into two parts, and first's high-temperature flue gas recompresses into liquid CO after supercooling, dedusting, desulfurization
2The second portion high-temperature flue gas is as circulating flue gas;
The second portion high-temperature flue gas is further divided into two-way: first via high-temperature flue gas is sent into the burner hearth inlet by the high temperature circulation blower fan, with O
2Enter burner hearth after the mixing; The second road high-temperature flue gas carries coal dust by cold circulating fan and sends into burner hearth after supercooling, dedusting and desulfurization.
Embodiment 1
The ignition step: utilize circulating flue gas to the burner hearth pulverized coal conveying, simultaneously, with O that separation of air obtains
2Send into burner hearth, ignition;
The flue gas recirculation step: the high-temperature flue gas that produces behind the coal dust firing in the burner hearth is divided into two parts, and first's high-temperature flue gas accounts for 30% of whole high-temperature flue gas volumes, after supercooling, dedusting, desulfurization, recompresses into liquid CO
2The second portion high-temperature flue gas accounts for 70% of whole high-temperature flue gas volumes, as circulating flue gas;
The second portion high-temperature flue gas is further divided into two-way: first via high-temperature flue gas accounts for 60% of circulating flue gas volume, after extracting out from burner hearth afterbody economizer rear portion, sends into the burner hearth inlet by the high temperature circulation blower fan, with separation of air gained O
2Enter burner hearth after the mixing, mix back O
2Volume accounts for and mixes 30% of back gas volume; The second road high-temperature flue gas accounts for 40% of circulating flue gas volume, successively by cooler and electric cleaner, after supercooling, dedusting and desulfurization, carries coal dust by cold circulating fan and sends into burner hearth.
Embodiment 2
The ignition step: utilize circulating flue gas to the burner hearth pulverized coal conveying, simultaneously, with O that separation of air obtains
2Send into burner hearth, ignition;
The flue gas recirculation step: the high-temperature flue gas that produces behind the coal dust firing in the burner hearth is divided into two parts, and first's high-temperature flue gas accounts for 30% of whole high-temperature flue gas volumes, after supercooling, dedusting, desulfurization, recompresses into liquid CO
2The second portion high-temperature flue gas accounts for 70% of whole high-temperature flue gas volumes, as circulating flue gas;
The second portion high-temperature flue gas is further divided into two-way: first via high-temperature flue gas accounts for 80% of circulating flue gas volume, after extracting out from burner hearth afterbody economizer rear portion, sends into the burner hearth inlet by the high temperature circulation blower fan, with separation of air gained O
2Enter burner hearth after the mixing, mix back O
2Volume accounts for and mixes 30% of back gas volume; The second road high-temperature flue gas accounts for 20% of circulating flue gas volume, successively by cooler and electric cleaner, after supercooling, dedusting and desulfurization, carries coal dust by cold circulating fan and sends into burner hearth.
Embodiment 3
The ignition step: utilize circulating flue gas to the burner hearth pulverized coal conveying, simultaneously, with O that separation of air obtains
2Send into burner hearth, ignition;
The flue gas recirculation step: the high-temperature flue gas that produces behind the coal dust firing in the burner hearth is divided into two parts, and first's high-temperature flue gas accounts for 60% of whole high-temperature flue gas volumes, after supercooling, dedusting, desulfurization, recompresses into liquid CO
2The second portion high-temperature flue gas accounts for 40% of whole high-temperature flue gas volumes, as circulating flue gas;
The second portion high-temperature flue gas is further divided into two-way: first via high-temperature flue gas accounts for 60% of circulating flue gas volume, after extracting out from burner hearth afterbody economizer rear portion, sends into the burner hearth inlet by the high temperature circulation blower fan, with separation of air gained O
2Enter burner hearth after the mixing, mix back O
2Volume accounts for and mixes 28% of back gas volume; The second road high-temperature flue gas accounts for 40% of circulating flue gas volume, successively by cooler and electric cleaner, after supercooling, dedusting and desulfurization, carries coal dust by cold circulating fan and sends into burner hearth.
Embodiment 4
The ignition step: utilize circulating flue gas to the burner hearth pulverized coal conveying, simultaneously, with O that separation of air obtains
2Send into burner hearth, ignition;
The flue gas recirculation step: the high-temperature flue gas that produces behind the coal dust firing in the burner hearth is divided into two parts, and first's high-temperature flue gas accounts for 60% of whole high-temperature flue gas volumes, after supercooling, dedusting, desulfurization, recompresses into liquid CO
2The second portion high-temperature flue gas accounts for 40% of whole high-temperature flue gas volumes, as circulating flue gas;
The second portion high-temperature flue gas is further divided into two-way: first via high-temperature flue gas accounts for 80% of circulating flue gas volume, after extracting out from burner hearth afterbody economizer rear portion, sends into the burner hearth inlet by the high temperature circulation blower fan, with separation of air gained O
2Enter burner hearth after the mixing, mix back O
2Volume accounts for and mixes 28% of back gas volume; The second road high-temperature flue gas accounts for 20% of circulating flue gas volume, successively by cooler and electric cleaner, after supercooling, dedusting and desulfurization, carries coal dust by cold circulating fan and sends into burner hearth.
Claims (3)
1. a method for re-circulating combustion of flue gas of pulverized coal fired boiler comprises ignition step and flue gas recirculation step successively, is provided with superheater, reheater, economizer and air preheater successively in the burner hearth rear portion flue of pulverized-coal fired boiler; It is characterized in that:
Ignition step: utilize circulating flue gas to the burner hearth pulverized coal conveying, simultaneously, separation of air is obtained 0
2Send into burner hearth, ignition;
The flue gas recirculation step: the high-temperature flue gas that produces behind the coal dust firing in the burner hearth is divided into two parts, and first's high-temperature flue gas recompresses into liquid CO after supercooling, dedusting, desulfurization
2The second portion high-temperature flue gas is as circulating flue gas;
The second portion high-temperature flue gas is further divided into two-way: first via high-temperature flue gas is sent into the burner hearth inlet by the high temperature circulation blower fan, with 0
2Enter burner hearth after the mixing; The second road high-temperature flue gas carries coal dust by cold circulating fan and sends into burner hearth after supercooling, dedusting and desulfurization.
2. method for re-circulating combustion of flue gas of pulverized coal fired boiler as claimed in claim 1 is characterized in that:
The volume ratio of first's high-temperature flue gas and second portion high-temperature flue gas is 3:7～6:4;
The volume ratio of the described first via high-temperature flue gas and the second road high-temperature flue gas is 6:4～8:2;
Described flue gas recirculation step enters 0 of burner hearth
2With the volume ratio of second portion high-temperature flue gas be 3:7～2.8:7.2.
3. method for re-circulating combustion of flue gas of pulverized coal fired boiler as claimed in claim 1 or 2 is characterized in that:
In the described flue gas recirculation step, the first via high-temperature flue gas of second portion high-temperature flue gas is extracted out from the economizer rear portion in the flue of burner hearth rear portion.
?
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102048825A CN101839474B (en) | 2010-06-22 | 2010-06-22 | Method for re-circulating combustion of flue gas of pulverized coal fired boiler |
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|---|---|---|---|
| CN2010102048825A CN101839474B (en) | 2010-06-22 | 2010-06-22 | Method for re-circulating combustion of flue gas of pulverized coal fired boiler |
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| CN101839474A CN101839474A (en) | 2010-09-22 |
| CN101839474B true CN101839474B (en) | 2011-05-18 |
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| JPH07119954A (en) * | 1993-10-29 | 1995-05-12 | Mitsui Eng & Shipbuild Co Ltd | Apparatus for liquifying carbon dioxide gas in discharged gas from boiler |
| US5906806A (en) * | 1996-10-16 | 1999-05-25 | Clark; Steve L. | Reduced emission combustion process with resource conservation and recovery options "ZEROS" zero-emission energy recycling oxidation system |
| CN2436805Y (en) * | 2000-07-31 | 2001-06-27 | 黑龙江双锅锅炉股份有限公司 | Dust and smoke purifier for boiler |
| CN100491822C (en) * | 2007-03-14 | 2009-05-27 | 哈尔滨工业大学 | Method of denitration utilizing biomass direct burning and smoke gas recirculating technology |
| CN101639227B (en) * | 2009-08-31 | 2011-01-05 | 华北电力大学（保定） | High oxygen concentration oxygen-enriched pulverized coal fractional combustion method and device therefor |
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