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
- temperature flue
- temperature
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- pulverized coal
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 239000003546 flue gas Substances 0.000 title claims abstract description 128
- 239000003245 coal Substances 0.000 title claims abstract description 31
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title description 8
- 238000009841 combustion method Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 abstract description 14
- 230000023556 desulfurization Effects 0.000 abstract description 14
- 238000001816 cooling Methods 0.000 abstract 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000002817 coal dust Substances 0.000 description 18
- 238000004781 supercooling Methods 0.000 description 14
- 238000000926 separation method Methods 0.000 description 11
- 238000010304 firing Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Classifications
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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
-
- 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
-
- 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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- Combustion Of Fluid Fuel (AREA)
Abstract
一种煤粉锅炉烟气再循环燃烧方法，属于煤粉O2和CO2循环燃烧方法，解决现有燃烧方法热效率低、燃尽性不好的问题。本发明包括(1)点火燃烧步骤：利用循环烟气向炉膛输送煤粉，同时将O2送入炉膛点火燃烧；(2)烟气循环步骤：燃烧产生的高温烟气分两部分，第一部分经冷却、除尘、脱硫压缩成液态CO2；第二部分再分两路：第一路通过高温循环风机送入炉膛入口，与O2混合；第二路经冷却、除尘和脱硫后，通过冷循环风机携带煤粉送入炉膛。本发明用高温烟气调节锅炉汽温，增强对流传热，提高锅炉汽温、锅炉热效率、脱硝率及高温烟气冷却后的CO2含量，降低NOx排放量、CO2捕捉和收集成本；达到国家节能环保标准。
A pulverized coal boiler flue gas recirculation combustion method belongs to the pulverized coal O2 and CO2 circulation combustion method, which solves the problems of low thermal efficiency and poor burnout performance of the existing combustion method. The present invention comprises (1) igniting combustion step: utilize circulating flue gas to convey pulverized coal to furnace, send O2 into furnace simultaneously and ignite and burn; After cooling, dedusting, and desulfurization, it is compressed into liquid CO 2 ; the second part is further divided into two paths: the first path is sent to the furnace inlet through a high-temperature circulating fan, and mixed with O 2 ; The circulating fan carries pulverized coal into the furnace. The invention uses high-temperature flue gas to adjust boiler steam temperature, enhance convective heat transfer, improve boiler steam temperature, boiler thermal efficiency, denitrification rate and CO2 content after cooling high-temperature flue gas, and reduce NOx emissions, CO2 capture and collection costs; Meet the national energy conservation and environmental protection standards.
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)
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 |
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| 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 | Denitrification method using biomass direct combustion and re-combustion and flue gas recirculation process |
| 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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