CN104832945A - Flue gas waste heat utilization system - Google Patents
Flue gas waste heat utilization system Download PDFInfo
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- CN104832945A CN104832945A CN201510226958.7A CN201510226958A CN104832945A CN 104832945 A CN104832945 A CN 104832945A CN 201510226958 A CN201510226958 A CN 201510226958A CN 104832945 A CN104832945 A CN 104832945A
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- heat
- flue gas
- smoke
- utilization system
- waste heat
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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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Abstract
The invention discloses a flue gas waste heat utilization system. The flue gas waste heat utilization system comprises an air preheater, a flue gas heat release device, a dust collector, a desulfurization tower and a flue gas heat absorption device, wherein each of the flue gas heat release device and the flue gas heat absorption device comprises a flue gas side and a heat medium side; the flue gas side of the flue gas heat release device is arranged between an outlet of the air preheater and an inlet of the dust collector and/or an outlet of the dust collector and an inlet of the desulfurization tower; the flue gas side of the flue gas heat absorption device is arranged at an outlet of the desulfurization tower; the heat medium sides of the flue gas heat release device and the flue gas heat absorption device form a heat exchange closed loop together, and the heat exchange closed loop is used for recycling the waste heat of flue gas at the inlet of the dust collector and/or the inlet of the desulfurization tower and raising the temperature of purified flue gas discharged from the desulfurization tower by utilizing the waste heat. A heat medium absorbs flue gas heat through the flue gas heat release device and then transfers the flue gas heat to the flue gas heat absorption device at the outlet of the desulfurization tower to heat the purified flue gas at the outlet of the desulfurization tower, so that the waste heat of the flue gas is fully utilized, the temperature of the purified flue gas is raised, and the phenomenon of gypsum rain can be completely eliminated.
Description
Technical field
The present invention relates to a kind of environment protection energy-saving equipment, particularly a kind of smoke waste heat utilization system being applied to thermal power plant.
Background technology
Along with energy-conserving and environment-protective require day by day to improve, fume afterheat utilizes and prevents smoke stack emission flue-gas temperature excessively low " gypsum rain " from becoming the optimization routine measure in thermal power plant gradually.
The configuration of flue gas system as a Fig. 2, boiler 21 is discharged flue gas and enter deduster 23 dedusting after air preheater 122 heat exchange, and the flue gas after dedusting enters desulfurizing tower 25 by air-introduced machine 24 and purifies further, and final flue gas is disposed to air from chimney 26.But, the flue-gas temperature that usual air preheater 121 exports is between 120 DEG C-150 DEG C, even can be higher, existing flue gas system is not used to the high-temperature flue gas after air preheater 122, and temperature increase measure is not had yet to the neat stress after desulfurization, be difficult to meet energy-conserving and environment-protective requirement, easily form " gypsum rain " phenomenon.
Summary of the invention
Based on this, be necessary for the problems referred to above, a kind of smoke waste heat utilization system utilizing fume afterheat to improve neat stress temperature is provided.
Smoke waste heat utilization system, it comprises air preheater, deduster and desulfurizing tower, flue gas heat-releasing device and flue gas heat sink; Described flue gas heat-releasing device and described flue gas heat sink include fume side and heating agent side; The fume side of described flue gas heat-releasing device is arranged between the outlet of described air preheater and the entrance of described deduster and/or between the entrance of the outlet of described deduster and described desulfurizing tower, and the fume side of described flue gas heat sink is arranged at the exit of described desulfurizing tower; The heating agent side of described flue gas heat-releasing device and described flue gas heat sink forms heat exchange closed-loop path jointly, for reclaiming the fume afterheat of described deduster porch and/or described desulfurizing tower porch and utilizing described waste heat to promote the temperature of the neat stress of being discharged by described desulfurizing tower.
Wherein in an embodiment, described flue gas heat-releasing device comprises one-level smoke heat replacing device and/or secondary smoke heat-exchanger rig, described one-level smoke heat replacing device is arranged between the outlet of described deduster and the entrance of described desulfurizing tower, and described secondary smoke heat-exchanger rig is arranged between the outlet of described air preheater and the entrance of described deduster.
Wherein in an embodiment, the heating agent side of described flue gas heat sink and the heating agent side of described one-level smoke heat replacing device and/or described secondary smoke heat-exchanger rig heating agent side form heat exchange closed-loop path jointly.
Wherein in an embodiment, the flue-gas temperature in described air-introduced machine exit is reduced to below acid dew point 10 DEG C and the above 20-25 DEG C of water dew point by described one-level smoke heat replacing device.
Wherein in an embodiment, within the flue-gas temperature of described deduster porch is reduced to acid dew point or is low to moderate acid dew point 3 DEG C by described secondary smoke heat-exchanger rig.
Wherein in an embodiment, the secondary smoke heat-exchanger rig that described flue gas heat-releasing device comprises one-level smoke heat replacing device and connects with described one-level smoke heat replacing device, the heating agent side of described flue gas heat sink and the heating agent side of described one-level smoke heat replacing device and described secondary smoke heat-exchanger rig heating agent side form heat exchange closed-loop path jointly.
Wherein in an embodiment, in described heat exchange closed-loop path, be provided with booster pump.
Wherein in an embodiment, smoke waste heat utilization system also comprises auxiliary heating system, described auxiliary heating system comprises auxiliary thermal source, auxiliary heat exchanging device and condenser, and described auxiliary heat exchanging device to be arranged between described auxiliary thermal source with described condenser and to be connected with described heat exchange closed-loop path.
Wherein in an embodiment, described auxiliary thermal source derives from auxiliary steam, heat supply backwater or other thermals source.
Wherein in an embodiment, smoke waste heat utilization system comprises between described house outlet and described desulfurizing tower entrance and is also provided with air-introduced machine, and described air-introduced machine is for the resistance of flue gas that overcomes described deduster and discharge and be introduced in one-level smoke heat replacing device.
In the present invention, heating agent adds the neat stress of thermally desulfurizing outlet by the flue gas heat sink being delivered to desulfurization outlet after flue gas heat-releasing device absorption flue gas heat, so takes full advantage of fume afterheat and improves neat stress temperature, guarantee to eliminate " gypsum rain " phenomenon completely.
Accompanying drawing explanation
Fig. 1 is the structural representation of the smoke waste heat utilization system of one embodiment of the invention;
Fig. 2 is a kind of structural representation of smoke waste heat utilization system.
Detailed description of the invention
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.Preferred embodiment of the present invention is given in accompanying drawing.But the present invention can realize in many different forms, is not limited to embodiment described herein.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present invention more comprehensively thorough.
It should be noted that, when element is called as " being fixed on " another element, directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may there is centering elements simultaneously.Term as used herein " vertical ", " level ", "left", "right" and similar statement are just for illustrative purposes.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
Please refer to Fig. 1, in a preferred embodiment of the present invention, smoke waste heat utilization system is connected with boiler 11, and it comprises and sets gradually air preheater 12, deduster 13 and desulfurizing tower 15, flue gas heat-releasing device 18 and flue gas heat sink 19.Wherein, air preheater 12 is connected with boiler 11, with the pre-heat smoke of the flue gas produced by boiler 11 by obtaining 120 DEG C-150 DEG C after air preheater 12.Flue gas heat-releasing device 18 and flue gas heat sink 19 include the heating agent side of fume side and heat absorption, the fume side of flue gas heat-releasing device 18 is arranged between the outlet of air preheater 12 and the entrance of deduster 13 and/or between the entrance of the outlet of deduster 13 and desulfurizing tower 15, and the fume side of flue gas heat sink 19 is arranged at the exit of desulfurizing tower 15.Flue gas heat-releasing device 18 forms heat exchange closed-loop path jointly with the heating agent side of flue gas heat sink 19, for reclaiming the fume afterheat of deduster 13 porch and/or desulfurizing tower 15 porch and utilizing the waste heat reclaimed to promote the temperature of the neat stress of being discharged by desulfurizing tower 15, flue-gas temperature is reduced and the effect improving neat stress temperature to reach, guarantee to eliminate " gypsum rain " phenomenon completely, realize the high-efficiency environment friendly economical operation of whole generating set.
Further, flue gas heat-releasing device 18 comprises one-level smoke heat replacing device 181, one-level smoke heat replacing device 181 is arranged between the outlet of deduster 13 and the entrance of desulfurizing tower 15, purifies further for entering desulfurizing tower 15 after being removed by the waste heat of the flue gas after dedusting.
Flue gas heat-releasing device 18 comprises secondary smoke heat-exchanger rig 182, and secondary smoke heat-exchanger rig 182 is arranged between the outlet of air preheater 12 and the entrance of deduster 13, for the waste heat of the smoke evacuation of recovery boiler to greatest extent flue gas.
Wherein, one-level smoke heat replacing device 181 in above-mentioned flue gas heat-releasing device 18 can also can select one to be wherein arranged in smoke waste heat utilization system with secondary smoke heat-exchanger rig 182 simultaneously, and be arranged at heating agent side in the heating agent side of the one-level smoke heat replacing device 181 in smoke waste heat utilization system and/or the heating agent side of secondary smoke heat-exchanger rig 182 and flue gas heat sink 19 and form heat exchange closed-loop path, with the waste heat of the flue gas by recovery, the neat stress of being discharged by desulfurizing tower 15 is heated, reduce flue-gas temperature to reach and promote neat stress temperature dual effect.
In this specific embodiment, the secondary smoke heat-exchanger rig 182 that flue gas heat-releasing device 18 comprises one-level smoke heat replacing device 181 and connects with one-level smoke heat replacing device 181.In flue gas heat sink 19, the heating agent side of heating agent side and one-level smoke heat replacing device 181 and the heating agent side of secondary smoke heat-exchanger rig 182 form heat exchange closed-loop path jointly.Wherein, in heat exchange closed-loop path, the heating agent rear flank of heating agent side and flue gas heat sink 19 that heating agent successively flows through secondary smoke heat-exchanger rig 182 after being flowed out by the heating agent side of one-level cigarette heat-exchanger rig 181 flows into the heating agent side of one-level cigarette heat-exchanger rig 181 again, so that fume afterheat in one-level smoke heat replacing device 181 fume side and secondary smoke heat-exchanger rig 182 fume side will be absorbed, and utilize the waste-heat absorbed to flow through the neat stress of fume side in flue gas heat sink 19, so prevent from making being expelled to neat stress Yin Wendu in air too low and formed " gypsum rain ".In this specific embodiment, because the flue-gas temperature of section between the outlet of deduster 13 and the entrance of desulfurizing tower 15 is lower than the flue-gas temperature of section between the outlet of air preheater 12 and the entrance of deduster 13, therefore heating agent in heat exchange closed-loop path is first flowed out by one-level cigarette heat-exchanger rig 181 between the outlet and the entrance of desulfurizing tower 15 of deduster 13, be beneficial to the preheating of heating agent in heat exchange closed-loop path.In some other embodiment, in heat exchange closed-loop path heating agent specifically by one-level smoke heat replacing device 181, secondary smoke heat-exchanger rig 182 and flue gas heat sink 19 wherein one first flow out, in this no limit.
Also be provided with air-introduced machine 14 between the outlet of deduster 13 and the entrance of desulfurizing tower 15, air-introduced machine 14 is for overcoming the resistance of the flue gas of deduster 13 discharge and being introduced in one-level smoke heat replacing device 181.From flue gas heat-releasing device 18 and the fume side of flue gas heat sink 19 and the heating agent side of flue gas heat-releasing device 18 and flue gas heat sink 19, smoke waste heat utilization system of the present invention is described in detail respectively below, wherein in this specific embodiment, thermal medium is water, in some other embodiment, thermal medium also can be other lower boiling liquid, such as ethylene glycol.
Fume side flow process: boiler 11 is discharged flue gas and enter secondary smoke heat-exchanger rig 182 after air preheater 12 heat exchange, in the process, the flue-gas temperature of deduster 13 entrance is reduced near acid dew point or within low 3 DEG C by secondary smoke heat-exchanger rig 182, thus makes the SO in flue gas
3the sulfuric acid that condensation is formed also is neutralized by alkaline matters a large amount of in dust, so not only reaches the sulfuric acid corrosion flue utilizing fume afterheat to greatest extent but also prevent low temperature to be formed.Then the flue gas after deduster 13 dedusting enters in one-level smoke heat replacing device 181 by air-introduced machine 14, in the process, the flue-gas temperature that air-introduced machine 14 exports is reduced to below acid dew point 10 DEG C and about the above 20-25 of water dew point DEG C by one-level smoke heat replacing device 181, because the flue-gas temperature of deduster 13 porch is reduced near acid dew point, major part acidic materials are removed by dust, the now SO in air-introduced machine 14 exit
3seldom, and flue-gas temperature is usually high than water dew point 20 DEG C about-25 DEG C, thus effectively prevents water in flue gas from separating out in a large number and to obtain SO with remaining
3form the phenomenon that sulfuric acid causes cold end corrosion, simultaneously because the outlet of one-level smoke heat replacing device 181 is positioned at the porch near desulfurizing tower 15, and the flue of the low-temperature zone of one-level smoke heat replacing device 181 and desulfurizing tower 15 porch all takes anti-corrosion measure process usually, thus effectively prevent the generation of cold end corrosion phenomenon further.Flue gas enters desulfurizing tower 15 and purifies further after being removed by waste heat in one-level smoke heat replacing device 181, the neat stress exporting discharge by desulfurizing tower 15 enters in flue gas heat sink 19 and heats up, final heat up after neat stress be disposed to air by chimney 16.
In above-mentioned fume side flow process, because flue-gas temperature reduces by secondary smoke heat-exchanger rig 182, make the corresponding minimizing of flue gas flow through deduster 13 and air-introduced machine 14, improve the operating efficiency of deduster 13, reduce the power consumption of deduster 13 and air-introduced machine 14; Meanwhile, because one-level smoke heat replacing device 181 reduces desulfurizing tower 15 entrance flue gas temperature, reduce desulfurization water consumption, saved desulfurization water.
Heat medium water effluent journey: heat medium water enters waste heat in one-level smoke heat replacing device 181 and secondary smoke heat-exchanger rig 182 recovered flue gas successively to promote water temperature, then through flue gas heat sink 19 heat release, water temperature is reduced, and the fume afterheat reclaimed is delivered to the neat stress in desulfurizing tower 15 exit, to promote the temperature of neat stress.Wherein, whole heat medium water side forms a heat exchange closed-loop path, and the temperature of the waste-heat back segment neat stress of the flue gas absorbed by the leading portion absorbed, improves the temperature of neat stress while reducing flue-gas temperature, realize energy-efficient ground fume afterheat to utilize, prevent the formation of " gypsum rain ".
Water system resistance is overcome by arranging booster pump 201, to maintain the flowing of heat medium water in cigarette closed-loop path in the heat exchange closed-loop path of above-mentioned heating agent side.
Further, in smoke waste heat utilization system of the present invention, be also provided with the auxiliary equipment of auxiliary heating system as flue gas, be not enough to prevent fume afterheat heat neat stress.Auxiliary heating system comprises auxiliary thermal source 202, auxiliary heat exchanging device 203 and condenser 204.Auxiliary heat exchanging device 203 to be arranged between auxiliary thermal source 202 with condenser 204 and to be connected with heat exchange closed-loop path, for promoting the temperature of heat medium water in auxiliary thermal source 202 and being delivered in heat exchange closed-loop path by the heat medium water after heat exchange.Wherein, auxiliary thermal source 202 can be auxiliary steam, heat supply backwater or other thermals source.Auxiliary steam draws gas from steam turbine, can select high pressure auxiliary steam or low pressure auxiliary steam, and if unit is cogeneration units, heat supply backwater can select the backwater of heat user, the backwater, sugar refinery's technique backwater etc. of such as papermaking user.
In the present invention, heat medium water adds the neat stress of thermally desulfurizing outlet by the flue gas heat sink being delivered to desulfurization outlet after two-stage smoke heat replacing device absorption flue gas heat, so take full advantage of fume afterheat and improve neat stress temperature, guarantee to eliminate " gypsum rain " phenomenon completely.In addition, when fume afterheat can not meet heating neat stress heat, adopt auxiliary heating mode, realize the high-efficiency environment friendly economical operation of unit.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make multiple distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. smoke waste heat utilization system, is characterized in that: comprise air preheater, deduster and desulfurizing tower, flue gas heat-releasing device and flue gas heat sink; Described flue gas heat-releasing device and described flue gas heat sink include fume side and heating agent side; The fume side of described flue gas heat-releasing device is arranged between the outlet of described air preheater and the entrance of described deduster and/or between the entrance of the outlet of described deduster and described desulfurizing tower, and the fume side of described flue gas heat sink is arranged at the exit of described desulfurizing tower; The heating agent side of described flue gas heat-releasing device and described flue gas heat sink forms heat exchange closed-loop path jointly, for reclaiming the fume afterheat of described deduster porch and/or described desulfurizing tower porch and utilizing described waste heat to promote the temperature of the neat stress of being discharged by described desulfurizing tower.
2. smoke waste heat utilization system according to claim 1, it is characterized in that: described flue gas heat-releasing device comprises one-level smoke heat replacing device and/or secondary smoke heat-exchanger rig, described one-level smoke heat replacing device is arranged between the outlet of described deduster and the entrance of described desulfurizing tower, and described secondary smoke heat-exchanger rig is arranged between the outlet of described air preheater and the entrance of described deduster.
3. smoke waste heat utilization system according to claim 2, is characterized in that: the heating agent side of described flue gas heat sink and the heating agent side of described one-level smoke heat replacing device and/or described secondary smoke heat-exchanger rig heating agent side form heat exchange closed-loop path jointly.
4. smoke waste heat utilization system according to claim 2, is characterized in that: the flue-gas temperature in described air-introduced machine exit is reduced to below acid dew point 10 DEG C and the above 20-25 DEG C of water dew point by described one-level smoke heat replacing device.
5. smoke waste heat utilization system according to claim 2, is characterized in that: within the flue-gas temperature of described deduster porch is reduced to acid dew point or is low to moderate acid dew point 3 DEG C by described secondary smoke heat-exchanger rig.
6. smoke waste heat utilization system according to claim 1, it is characterized in that: the secondary smoke heat-exchanger rig that described flue gas heat-releasing device comprises one-level smoke heat replacing device and connects with described one-level smoke heat replacing device, the heating agent side of described flue gas heat sink and the heating agent side of described one-level smoke heat replacing device and described secondary smoke heat-exchanger rig heating agent side form heat exchange closed-loop path jointly.
7. smoke waste heat utilization system according to claim 6, is characterized in that: be provided with booster pump in described heat exchange closed-loop path.
8. smoke waste heat utilization system according to claim 1, it is characterized in that: also comprise auxiliary heating system, described auxiliary heating system comprises auxiliary thermal source, auxiliary heat exchanging device and condenser, and described auxiliary heat exchanging device to be arranged between described auxiliary thermal source with described condenser and to be connected with described heat exchange closed-loop path.
9. smoke waste heat utilization system according to claim 8, is characterized in that: described auxiliary thermal source derives from auxiliary steam, heat supply backwater or other thermals source.
10. smoke waste heat utilization system according to claim 2, it is characterized in that: comprise between described house outlet and described desulfurizing tower entrance and be also provided with air-introduced machine, described air-introduced machine is for overcoming the resistance of the flue gas of described deduster discharge and being introduced in one-level smoke heat replacing device.
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| CN201510226958.7A CN104832945A (en) | 2015-05-05 | 2015-05-05 | Flue gas waste heat utilization system |
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Cited By (3)
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| CN105351955A (en) * | 2015-11-05 | 2016-02-24 | 武汉烽火兴业节能环保科技有限公司 | Intelligent detection system and method for flue gas dust removal |
| CN107261794A (en) * | 2017-07-19 | 2017-10-20 | 乌海昊华高科节能技术有限公司 | A kind of reclamation of stack gas afterheat and the integrated apparatus and technique of desulfurization |
| JP2019100612A (en) * | 2017-12-01 | 2019-06-24 | 株式会社Ihi | Heat exchanger for boiler exhaust gas |
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