CN102425789A - Coal-fired fluidized bed micro oxygen rich combustion CO2 emission reduction method and system - Google Patents
Coal-fired fluidized bed micro oxygen rich combustion CO2 emission reduction method and system Download PDFInfo
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- CN102425789A CN102425789A CN2011103434598A CN201110343459A CN102425789A CN 102425789 A CN102425789 A CN 102425789A CN 2011103434598 A CN2011103434598 A CN 2011103434598A CN 201110343459 A CN201110343459 A CN 201110343459A CN 102425789 A CN102425789 A CN 102425789A
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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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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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 coal-fired fluidized bed micro oxygen rich combustion CO2 emission reduction method and a coal-fired fluidized bed micro oxygen rich combustion CO2 emission reduction system for solving the problem of low-cost CO2 emission reduction of an industrialized coal-fired boiler. A micro oxygen rich combustion mode using mixed gas of air, oxygen and recycled smoke as a combustion aid is adopted, wherein the mixed gas contains about 25 percent of oxygen, 30 to 40 percent of recycled smoke and the balance of air; and in the micro oxygen rich combustion mode, the concentration of the CO2 gas in the generated smoke is 30 to 40 percent, and the CO2 in the smoke is removed by adopting a physical adsorption technology. The invention also provides a system device for implementing the method. By considering oxygen making cost, energy consumption and optimal comprehensive effect of separating CO2 by physical adsorption and combining the micro oxygen rich concept and the circulating fluidized bed combustion technology, desulfuration, denitration, decarburization and zero pollution emission at lower cost can be realized. The invention has the advantages of good economic efficiency, simple process, low energy consumption, high automation degree in operation process and the like.
Description
Technical field
The present invention relates to a kind of coal fired power generation technology, particularly coal-fired fluidized bed little oxygen-enriched combusting CO
2Discharge-reducing method and system belong to the boiler combustion technology field.
Background technology
In recent years, Global Greenhouse Effect was serious day by day, had had influence on a lot of national economic life, even threatened the existence problem of the low country in some sea level.The main cause that causes greenhouse effects is CO
2, wherein, the coal-fired CO that is produced
2Account for the annual discharging in whole world CO
2More than 50% of total amount.Therefore, the CO that produces to fire coal
2Reduction of discharging has critical role to slowing down greenhouse effects.The industrialization coal-burning boiler adopts the air-breathing mode at present, promptly with the combustion-supporting medium of air as coal.CO in the flue gas that its burning back generates
2Content is 13%～15%, and all the other overwhelming majority are the N that gets into burner hearth with air
2Want the CO in the flue gas
2Reclaim, necessary elder generation is with the CO of low concentration
2From flue gas, separate.Because burning, coal generates CO in the flue gas under this combustion system
2Concentration very low, therefore adopt existing Chemical Decomposition or physical separation method, the Technological Economy level is all infeasible.As, adopt chemical separation technology to have problems such as separation equipment is complicated, investment operating cost is high, less economical; And at this CO
2Adopt Physical Separation Technology to have problems such as chemical reaction rate is low, separation equipment is huge under the concentration, and the huge exhaust smoke level of thermal power plant's coal-burning boiler cause adopting physisorphtion to divide the CO in the separable flue gas
2Possibly realize hardly.
At the coal-fired CO that occurs at present
2In the emission-reduction technology, oxygen-enriched combustion technology (O
2/ CO
2) for having most one of technology of application prospect.This technology is to utilize purity oxygen to replace the combustion adjuvant of air as coal combustion, adopts the method for flue gas recirculation simultaneously, controls the temperature of stove internal combustion, thereby obtains high concentration (more than 90%, butt) CO
2Gas.This combustion system needn't divide the CO in the separable flue gas earlier down
2, can liquid CO be directly reclaimed in the flue gas compression
2But this combustion system maximum defective be less economical, full factory efficient descends about 8～10% than air burning pattern.This mainly is because pure oxygen that need be a large amount of under the oxygen-enriched combusting mode supplies fuel combustion, and the ASU making oxygen by air separation energy consumption of ability industrial applications is very high at present.In addition, pure oxygen burning needs a large amount of flue gases to participate in recirculation keeping temperature in the stove, thereby needs powerful recirculation blower.Because at present the full factory efficient of power plant is also only about 40%, this makes each power plant be difficult to bear the economy that adopts 8～10% degree that cause after the oxygen-enriched combusting mode to descend.
Summary of the invention
The present invention be used to overcome prior art deficiency, a kind of technical simple, economically feasible coal-fired fluidized bed little oxygen-enriched combusting CO is provided
2Discharge-reducing method and system.
The alleged problem of the present invention is solved by following technical scheme:
A kind of coal-fired fluidized bed little oxygen-enriched combusting CO
2Discharge-reducing method; Its special feature is; Its adopts with the gaseous mixture of air, oxygen and the flue gas recycled little oxygen-enriched combusting mode as combustion adjuvant; Wherein oxygen content is 25% in the gaseous mixture, circulating flue gas content is 30%-40%, and surplus is an air: under said little oxygen-enriched combusting mode, generate CO in the flue gas
2Gas concentration is 30%～40%, the CO in the flue gas
2Adopt physical adsorption techniques to remove.
A kind of coal-fired fluidized bed little oxygen-enriched combusting CO
2Emission-reducing system, its special feature is: it comprises making oxygen by air separation device, air-supply arrangement, circulating fluidized bed device, dust arrester and CO
2Retracting device; Wherein, Making oxygen by air separation device separation of air is produced purity oxygen, and oxygen mixes after air-supply arrangement is sent into confession fuel combustion in the recirculating fluidized bed burner hearth through the circulating flue gas that purifies with air and part, and the flue gas that fuel combustion generates is most of CO that gets into after dedusting
2Retracting device, sub-fraction is as in the circulating flue gas recirculation backflowization pool furnace thorax.
Above-mentioned coal-fired fluidized bed little oxygen-enriched combusting CO
2Emission-reducing system; Said circulating fluidized bed device comprises recirculating fluidized bed burner hearth, cyclone separator, returning charge controller, external heat exchanger, afterbody convection current thermoreceptor, gas-to-gas heat exchanger and ash-dregs cooler, and wherein recirculating fluidized bed burner hearth top, cyclone separator, afterbody convection recuperator, gas-to-gas heat exchanger are communicated with successively; Cyclone separator outlet at bottom, returning charge controller, external heat exchanger and recirculating fluidized bed burner hearth bottom link to each other successively; Recirculating fluidized bed burner hearth outlet at bottom is communicated with ash-dregs cooler; The returning charge controller links to each other with the recirculating fluidized bed burner hearth.
Above-mentioned coal-fired fluidized bed little oxygen-enriched combusting CO
2Emission-reducing system; Said air-supply arrangement comprises air-introduced machine, flow control valve, circulating fan, fluidisation blower fan; Wherein, the flue gas that gas-to-gas heat exchanger is seen off is divided into three the tunnel behind flow through successively air-introduced machine, the flow control valve after being purified by dust arrester; Wherein, first via circulating flue gas gets into the gas-to-gas heat exchanger heat exchange and sends into the fluid bed burner hearth with the air after oxygen and the heat exchange after mixing through circulating fan; The second the tunnel sends into external heat exchanger through the fluidisation blower fan; Third Road is sent into CO
2Retracting device.
Above-mentioned coal-fired fluidized bed little oxygen-enriched combusting CO
2Emission-reducing system, said CO
2Retracting device comprises booster fan, the CO that links to each other successively
2Adsorption tower, vavuum pump, middle air accumulator, gas cooler, compressor, liquid CO
2Holding vessel, and each magnetic valve, wherein CO
2Adsorption tower is two parallel CO
2Hocket absorption and take off and inhale operation of adsorption tower A and B, two adsorption towers.
Above-mentioned coal-fired fluidized bed little oxygen-enriched combusting CO
2Emission-reducing system, said making oxygen by air separation device comprises air separator and N
2Recover is by the isolated O of air separator
2Mix the coal-fired fluidized bed little oxygen-enriched combusting of confession with air, circulating flue gas, by the isolated N of air separator
2Send into N
2Recover.
Above-mentioned coal-fired fluidized bed little oxygen-enriched combusting CO
2Emission-reducing system, said dust arrester comprises deduster and gas cooler, and said deduster inlet links to each other with gas-to-gas heat exchanger, and the deduster outlet links to each other with gas cooler.
Characteristics of the present invention are following:
1, the inventive method combines little oxygen enrichment and Combustion technology of circulating fluidized, can realize desulfurization more cheaply, denitration, decarburization zero disposal of pollutants.
2, the required pure oxygen amount of the coal combustion of unit mass is than the remarkable reduction of oxygen-enriched combusting under little oxygen-enriched combusting mode, and the energy consumption of making oxygen by air separation also reduces with investment thereupon significantly.
With a 600MW unit is example, and the economy parameter under its conventional air burning, little oxygen-enriched combusting and three kinds of combustion systems of oxygen-enriched combusting compares and sees the following form.
The comparison of economy parameter under three kinds of different atmospheres of table 1 600MW unit:
| Project | Air burning | Little oxygen-enriched combusting | Oxygen-enriched combusting |
| Air capacity (Nm 3/s） | 526.47 | 177.56 | － |
| Amount of oxygen (Nm 3/s） | － | 59.18 | 93.85 |
| Making oxygen by air separation investment (ten thousand yuan) | － | 43666.22 | 70436.78 |
| Making oxygen by air separation energy consumption (MW) | － | 71.04 | 114.6 |
。Can find out that from table 1 the required pure oxygen amount of coal combustion is merely about 60% under the oxygen-enriched combusting mode in little oxygen-enriched combusting following unit interval of mode, this causes investment and the energy consumption of making oxygen by air separation to be compared with oxygen-enriched combusting having reduced about 40%.And the full decrease in efficiency 8%-10% of factory is mainly caused by making oxygen by air separation under the oxygen-enriched combusting.It is thus clear that economy is significantly improved under little oxygen-enriched combusting.
3, than oxygen-enriched combusting, the required flue gas recycled amount of the inventive method greatly reduces.Little oxygen-enriched combusting mode adopts air, oxygen and circulating flue gas to mix the combustion mode.Under the recirculating fluidized bed oxygen-enriched combusting mode, 50%～60% recirculation of exhaust gas volumn is melted down in the thorax to guarantee the fluidisation of material in the stove.Because the air that adds can be used as the effect that the part fluidized wind plays material in the fluidisation stove, therefore, compare with oxygen-enriched combusting under little oxygen-enriched combusting mode, the required amount of circulating gas of little oxygen-enriched combusting mode reduces about 35%.This causes circulating fan power significantly to reduce, from and further improved should technology economy.
4, generate CO in the flue gas under little oxygen-enriched combusting mode of the inventive method
2Gas concentration is between 30%～40%, and this concentration range is to take into account system oxygen cost, energy consumption and physical absorption separation of C O
2Resultant effect is best.Why select this concentration range, be based on following reason.Physisorphtion is handled CO at present
2The maximum bottleneck of technology is: work as CO
2When concentration is low (less than 20%), adsorbents adsorb CO
2Efficient is very low.And under conventional air burning pattern, CO in the flue gas that coal combustion produces
2Concentration about 15%, and the exhaust gas volumn that produces is huge.Therefore, huge this technology that causes of exhaust gas volumn that needs in the low adsorption rate under the air burning mode, unit interval to handle can not be by commercial Application.And under little oxygen-enriched combusting mode CO in the flue gas
2Concentration brings up at 30%～40% o'clock, and the absorption efficiency of adsorbent reaches more than 80%, and 50% under the not enough air burning mode of the exhaust gas volumn of burning generation, and this makes physisorphtion reclaim CO in thermal power plant's smoke evacuation
2Commercial Application become possibility.
5, system of the present invention is fit to the transformation of existing boiler.Little oxygen-enriched combusting mode adopts air, oxygen and circulating flue gas to mix the combustion mode, and original combustion system only needs very little change can adopt this combustion system.And the oxygen-enriched combusting mode utilizes oxygen to carry out the combustion-supporting of coal combustion merely, and original wind powder system needs bigger transformation could adopt this combustion system.Therefore, compare with oxygen-enriched combusting, little oxygen-enriched combusting mode is more suitable for the transformation of existing boiler.
6, the fluid bed furnace internal heating surface arranges that compactness and heating surface area significantly reduce more than air burning under little oxygen-enriched combusting mode.This has reduced the metal consumptive material, has reduced power plant's initial cost.
Description of drawings
Fig. 1 is apparatus of the present invention sketch mapes;
Fig. 2 is CO
2The retracting device sketch map.
Each label is represented as follows in the accompanying drawing: 1, recirculating fluidized bed burner hearth; 2, cyclone separator; 3, afterbody convection recuperator; 4, gas-to-gas heat exchanger; 5, dust arrester; 6, gas cooler; 7, air-introduced machine; 8, flow control valve; 9, CO
2Retracting device; 10, returning charge controller; 11, external heat exchanger; 12, ash-dregs cooler; 13, air separator; 14, N
2Recover; 15, circulating fan; 16, fluidisation blower fan; 17, booster fan; 18, CO
2Adsorption tower; 19, vavuum pump; 20, middle air accumulator; 21, gas cooler; 22, CO
2Compressor; 23, liquid CO
2Holding vessel; A-f is a magnetic valve.
The specific embodiment
The inventive method combines coal-fired fluidized bed little oxygen-enriched combusting with physical absorption, constitute industrialization coal-burning boiler CO jointly
2Emission-reduction technology.Said coal-fired fluidized bed little oxygen-enriched combusting be gaseous mixture with air, oxygen and flue gas recycled as combustion adjuvant, oxygen content is about 25% in the said gaseous mixture, flue gas recycled content is 30%-40%, surplus is an air.Under little oxygen-enriched combusting mode, generate CO in the flue gas
2Gas concentration is 30%～40%, the CO in the flue gas
2Adopt physical adsorption techniques to remove.
The coal-fired fluidized bed little oxygen-enriched combusting of the present invention system comprises making oxygen by air separation device, air-supply arrangement, circulating fluidized bed device, dust arrester and CO
2Retracting device, detail said apparatus below in conjunction with accompanying drawing:
Referring to Fig. 1, said circulating fluidized bed device comprises recirculating fluidized bed burner hearth 1, cyclone separator 2, returning charge controller 10, external heat exchanger 11, afterbody convection current thermoreceptor 3, gas-to-gas heat exchanger 4 and ash-dregs cooler 12.The lime-ash that recirculating fluidized bed burner hearth 1 internal combustion generates is discharged by ash-dregs cooler 12 coolings.And wherein the flue gas of burning generation (mainly is CO
2, N
2, H
2O, fly ash granule) is introduced into cyclone separator 2.In cyclone separator 2, most fly ash granule is separated from flue gas.The fly ash granule that separates is under the adjusting of returning charge controller 10, and a part directly turns back in the recirculating fluidized bed burner hearth 1, and another part returns recirculating fluidized bed burner hearth 1 again after external heat exchanger 11 coolings.The flow that utilizes returning charge controller 10 to regulate the fly ash granule that gets into external fluid-bed heat exchanger 11 reaches the purpose of regulating boiler load and fire box temperature.When temperature is too high, increase the temperature that the flying dust amount that gets into external heat exchanger 11 reduces burner hearth through regulating returning charge controller 10; Otherwise,, then reduce the flying dust amount that gets into external heat exchanger 11 if fire box temperature is low excessively.
Still referring to Fig. 1, said air-supply arrangement comprises air-introduced machine 7, flow control valve 8, circulating fan 15, fluidisation blower fan 16.
After flue gas that dust arrester purifies is through flow control valve 8, be divided into three the tunnel; Wherein, First via circulating flue gas gets into gas-to-gas heat exchanger 4 heat exchange and mixes with air in getting into gas-to-gas heat exchanger 4 through circulating fan 15, after seeing off by gas-to-gas heat exchanger 4 then again with oxygen mix.The gaseous mixture that circulating flue gas, air and oxygen are formed is divided into primary and secondary air to be sent in the recirculating fluidized bed burner hearth 1, and wherein a wind mainly plays the effect of material in the fluidisation burner hearth as fluidized wind; Secondary wind then is the oxygen that abundance is provided for the completing combustion of coal dust in the burner hearth.The second the tunnel sends into external heat exchanger 11 through fluidisation blower fan 16, and this part fluidized wind mainly is in order to guarantee the fluidisation of materials in the external heat exchanger 11.Third Road is sent into CO
2Retracting device 9.
Still referring to Fig. 1, said making oxygen by air separation device comprises air separator 13 and N
2Recover 14.The preparation process of the required pure oxygen of little oxygen-enriched combusting is accomplished in air separator 13.Not Tong Guo Qi – gas heat exchanger 4 heating of the pure oxygen of producing by air separator 13; But with after the air after Qi – gas heat exchanger 4 heating and circulating flue gas mix, directly send into burner hearth, this has been avoided the problem of purity oxygen Jing Qi – gas heat exchanger 4 gas leakage in heating process.And by air separator 13 isolated N
2Send into N
2Recover 14 is so that further utilize.
Still referring to Fig. 1, said dust arrester comprises deduster 5 and gas cooler 6.Successively through afterbody convection current thermoreceptor 3 Ji Qi – gas heat exchangers 4, in deduster 5, carry out dust removal process through the flue gas after cyclone separator 2 separation then.The existence of water vapour can reduce adsorbent to CO in the flue gas
2Adsorption capacity, and the too high adsorption capacity that also can influence adsorbent of the temperature of system in the adsorption process.Therefore, need to be cooled to below the water dew point to remove the moisture in the flue gas through gas cooler 6 through the flue gas of dedusting, flue gas gets into flow control valves 8 through air-introduced machine 7 then.
Referring to Fig. 1, Fig. 2, the 60%-70% that fuel combustion generates flue gas gets into CO after dedusting
2Retracting device 9 is accomplished CO in the flue gas
2Removal process.Said CO
2Retracting device comprises booster fan 17, the CO that links to each other successively
2 Adsorption tower 18, vavuum pump 19, middle air accumulator 20, gas cooler 21, compressor 22, liquid CO
2Holding vessel 23, and magnetic valve a, b, c, d, e, f.CO wherein
2Adsorption tower is two parallel CO
2Adsorption tower A and B are CO in the tower
2Adsorbent.When one of them tower carried out adsorption operations, another tower then takes off inhaled operation, to guarantee running without interruption of whole operation system.When getting into the A tower and adsorb from the flue gas of booster fan 17, magnetic valve a, d, e open, and b, c, f close.Flue gas gets in the A tower through magnetic valve a, the CO in the flue gas
2Gas is adsorbed, and the N that is not adsorbed
2Directly discharge through valve e Deng gas.When adsorbing in the A tower, in the B tower gas that has adsorbed reduced pressure to take off and inhale operation.The B tower reduces pressure and takes off when inhaling, and magnetic valve a, d, e open, and b, c, f keep shut.Carry out vacuum pumping through 19 pairs of B towers of vavuum pump, the CO that is adsorbed when vacuum is 4 KPa-6 KPa in the B tower
2Gas is adsorbed agent and discharges again.And open as magnetic valve b, c, f, a, d, when closing, e carries out adsorption operations for the B tower, and the A tower takes off inhales operation.The CO after the suction is taken off in decompression
2Gas is through vavuum pump 19, middle air accumulator 20 to gas cooler 21.In gas cooler 21, be cooled to (CO below 25 ℃
2Critical-temperature is 31.4 ℃) CO
2Gas gets in the high-pressure compressor 22 and compresses and liquefies the CO after the liquefaction
2Be stored in CO
2In the holding vessel 23.
Claims (7)
1. coal-fired fluidized bed little oxygen-enriched combusting CO
2Discharge-reducing method; It is characterized in that its adopts with the gaseous mixture of air, oxygen and the flue gas recycled little oxygen-enriched combusting mode as combustion adjuvant, wherein oxygen content is 25% in the gaseous mixture, circulating flue gas content is 30%-40%; Surplus is an air: under said little oxygen-enriched combusting mode, generate CO in the flue gas
2Gas concentration is 30%～40%, the CO in the flue gas
2Adopt physical adsorption techniques to remove.
2. coal-fired fluidized bed little oxygen-enriched combusting CO
2Emission-reducing system is characterized in that: it comprises making oxygen by air separation device, air-supply arrangement, circulating fluidized bed device, dust arrester and CO
2Retracting device; Wherein, Making oxygen by air separation device separation of air is produced purity oxygen, and oxygen mixes after air-supply arrangement is sent into confession fuel combustion in the recirculating fluidized bed burner hearth through the circulating flue gas that purifies with air and part, and the flue gas that fuel combustion generates is most of CO that gets into after dedusting
2Retracting device.
3. coal-fired fluidized bed little oxygen-enriched combusting CO according to claim 2
2Emission-reducing system; It is characterized in that: said circulating fluidized bed device comprises recirculating fluidized bed burner hearth (1), cyclone separator (2), returning charge controller (10), external heat exchanger (11), afterbody convection current thermoreceptor (3), gas-to-gas heat exchanger (4) and ash-dregs cooler (12), and wherein recirculating fluidized bed burner hearth top, cyclone separator, afterbody convection recuperator, gas-to-gas heat exchanger are communicated with successively; Cyclone separator outlet at bottom, returning charge controller, external heat exchanger and recirculating fluidized bed burner hearth bottom link to each other successively; Recirculating fluidized bed burner hearth outlet at bottom is communicated with ash-dregs cooler; The returning charge controller links to each other with the recirculating fluidized bed burner hearth.
4. coal-fired fluidized bed little oxygen-enriched combusting CO according to claim 3
2Emission-reducing system; It is characterized in that: said air-supply arrangement comprises air-introduced machine (7), flow control valve (8), circulating fan (15), fluidisation blower fan (16); Wherein, after the flue gas that gas-to-gas heat exchanger (4) is seen off was purified by dust arrester, the air-introduced machine (7) of flowing through successively, flow control valve were divided into three the tunnel after (8); Wherein, first via circulating flue gas gets into gas-to-gas heat exchanger (4) heat exchange and sends into the fluid bed burner hearth with the air after oxygen and the heat exchange after mixing through circulating fan (15); The second the tunnel through the sulfuration blower fan (16) send into external heat exchanger (11); Third Road is sent into CO
2Retracting device.
5. coal-fired fluidized bed little oxygen-enriched combusting CO according to claim 4
2Emission-reducing system is characterized in that: said CO
2Retracting device comprises booster fan (17), the CO that links to each other successively
2Adsorption tower (18), vavuum pump (19), middle air accumulator (20), gas cooler (21), compressor (22), liquid CO
2Holding vessel (23), and each magnetic valve, wherein CO
2Adsorption tower is two parallel CO
2Hocket absorption and take off and inhale operation of adsorption tower A and B, two adsorption towers.
6. coal-fired fluidized bed little oxygen-enriched combusting CO according to claim 5
2Emission-reducing system is characterized in that: said making oxygen by air separation device comprises air separator (13) and N
2Recover (14) is by the isolated O of air separator
2Mix the coal-fired fluidized bed little oxygen-enriched combusting of confession with air, circulating flue gas, by the isolated N of air separator
2Send into N
2Recover.
7. coal-fired fluidized bed little oxygen-enriched combusting CO according to claim 6
2Emission-reducing system is characterized in that: said dust arrester comprises deduster (5) and gas cooler (6), and said deduster inlet links to each other with gas-to-gas heat exchanger (4), and the deduster outlet links to each other with gas cooler.
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