CN101634449A - Method for reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion - Google Patents
Method for reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion Download PDFInfo
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- CN101634449A CN101634449A CN200910034141A CN200910034141A CN101634449A CN 101634449 A CN101634449 A CN 101634449A CN 200910034141 A CN200910034141 A CN 200910034141A CN 200910034141 A CN200910034141 A CN 200910034141A CN 101634449 A CN101634449 A CN 101634449A
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- flue gas
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Abstract
The invention relates to a method for reducing emission of CO2 by circulating fluidized bed temperature flue gas circulation oxygen combustion, which is a method for realizing CO2 emission reduction applied in a circulating fluidized bed boiler based on the technology of temperature flue gas circulating oxygen combustion. The method comprises the following steps: feeding fuel and desulfurater into the circulating fluidized bed boiler, taking the gas mixture of O2 and circulating flue gas as combustion agent, passing through the heating surface at the tail by the flue gas generated by combustion, heating O2 (concentration is 96.5%-98.5%) from an air separation unit, generating temperature flue gas at the temperature of 140-150 DEG C, taking the gas mixture composed of 30%-70% of the temperature flue gas and O2 as oxidant to delivery to a furnace for combustion, carrying out dedusting by a deduster, multi-level condensation and dehydration and compression on the residual flue gas (volume concentration of CO2 is larger than 95%), and realizing resource utilization or storing in a sealing manner. The circulating glue gas is rich in vapor, entrainment unburned carbon and active desulfurater; the method enhances radiant heat exchange in the furnace, solves the problem of insufficient amount of convection heat transfer, improves combustion efficiency and desulfuration efficiency of the furnace, and can realize near-zero emission of gas pollutant; besides, the method can also lower comprehensive power consumption of space division and CO2 compression, and improve generating efficiency.
Description
Technical field
The present invention relates to a kind of circulating fluidized bed temperature flue gas recirculation oxygen burning and catch CO
2Method, belong to the technical field of energy-saving and environmental protection engineering.
Background technology
The a large amount of greenhouse gases CO that discharge owing to combustion of fossil fuel
2The harm that environment is caused has caused showing great attention to of the whole world.At numerous CO
2In the middle of the separation and collection technology, but the oxygen combustion technology reclaims CO as a kind of novel low-cost separation
2And the combustion system of the brand new ideas that pollutant emission is lower has caused various countries researchers' attention.The recirculating fluidized bed oxygen combustion technology that the clean coal combustion technology of itself and recirculating fluidized bed is combined is with a wide range of applications.It compares advantage with coal-powder boiler oxygen combustion technology three:
1. flue gas recirculation amount can significantly reduce, and boiler volume is corresponding to diminish;
2. can realize SO
2/ NO
xStove in cooperation-removal, do not need the tail flue gas treating apparatus;
3. do not need the development of new burner, or the like.
But also there is certain shortcoming, high O
2The furnace volume that the concentration burning brings diminishes and makes the layout of stove internal heating surface have difficulties; The too high optimum operation that then can depart from CFBB of temperature reduces desulfuration efficiency.
In order to address the above problem, to propose a kind of recirculating fluidized bed oxygen burning and catch CO based on warm flue gas recirculation
2Method.
Summary of the invention
Technical problem: the method that the objective of the invention is to disclose a kind of reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion.This method has been strengthened radiation heat transfer amount in the stove, has improved the efficiency of combustion and the desulfuration efficiency of boiler, can realize the near-zero release of gaseous contaminant, can reduce the energy consumption of air-separating plant and carbon dioxide compression device simultaneously, improves generating efficiency.
Technical scheme: the method for reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion of the present invention is: the desulfurizing agent in fuel in the Bunker and the desulfurizing agent storehouse is added the burning of recirculating fluidized bed burner hearth, the flue gas that is produced is after the back-end surfaces heat exchange, the oxygen that heating is made by the air-separating plant separation of air and then to produce temperature be 140 ℃-150 ℃ warm flue gas, send back to the recirculating fluidized bed burner hearth and carry out circulating combustion with being divided into once oxidation agent and secondary oxidation agent after the warm flue gas of 30%-70% and the heating back oxygen mix, remaining temperature flue gas is sent into the deduster dedusting, dewater and compressor compresses obtains the carbon dioxide of volumetric concentration 95% or more, realization recycling or seal up for safekeeping through the multi-stage condensing device then.
Send back to is that the warm flue gas that the recirculating fluidized bed burner hearth carries out circulating combustion is rich in steam, carries unburned carbon and active desulfurizing agent secretly.
By the air-separating plant separation of air make oxygen concentration be 96.5%-98.5%.
Beneficial effect:
1. compare with the burning of recirculating fluidized bed cold flue gas (typical temperature＜100 ℃) circulation oxygen, realized the reasonable utilization of energy, boiler thermal output is improved.
2. compare with the burning of recirculating fluidized bed cold flue gas circulation oxygen, the water vapour content in the inner flue gas of the stove composition improves, and has strengthened the radiation heat transfer in the stove.
3. compare with the flue gas recirculation recirculating fluidized bed oxygen burning after the dedusting, realized the recirculation of flying dust in the flue gas, can improve efficiency of combustion and desulfuration efficiency.
4. with other O
2The oxygen burning of concentration is compared, and has reduced system oxygen power consumption and CO
2Compression power consumption has improved generating efficiency.
Description of drawings
Fig. 1 is that the burning of circulating fluidized bed temperature flue gas recirculation oxygen reduces discharging CO
2The schematic diagram of method.
The specific embodiment
Fuel and desulfurizing agent are added burning in circulating fluid bed boiler, the O that heating is made by air-separating plant after the heat exchange of the flue gas that is produced process back-end surfaces
2(concentration is 96.5%-98.5%) produces 140 ℃-150 ℃ warm flue gas, with 30%-70% and the O in the above-mentioned temperature flue gas
2Mixing sends back to as oxidant carries out circulating combustion in the stove, remaining temperature flue gas is sent into the deduster dedusting, dewaters and compression obtains high concentration CO through multi-stage condensing then
2(greater than 95%) is realized recycling or is sealed up for safekeeping.Because radiation heat transfer amount in the stove has effectively been strengthened in the existence of steam in the circulating flue gas, solved the problem of recirculating fluidized bed oxygen combustion boiler heat convection quantity not sufficient in this system; Unburned carbon and the unreacted active desulfurizing agent that carries in the circulating flue gas enters in the stove simultaneously, improved the efficiency of combustion and the desulfuration efficiency of boiler, can realize the near-zero release of gaseous contaminant.The system oxygen concentration is 96.5%-98.5%, has optimized system oxygen power consumption and CO
2Compression power consumption makes system oxygen power consumption and CO
2Compression power consumption sum minimum has reduced station service, has improved generating efficiency.So form the burning of circulating fluidized bed temperature flue gas recirculation oxygen and caught CO
2Method.
CO is caught in circulating fluidized bed temperature flue gas recirculation oxygen burning of the present invention
2The structure of a kind of embodiment of method as shown in Figure 1, Bunker 1, desulfurizing agent storehouse 2 and circulating fluidized bed combustor 3 link to each other, circulating fluidized bed combustor 3 lower ends link to each other with slag cooler 4, the upper end links to each other with cyclone separator 5, cyclone separator 5 lower ends link to each other with external heat exchanger 6 upper ends, external heat exchanger 6 lower ends link to each other with circulating fluidized bed combustor 3, and cyclone separator 5 links to each other back-end surfaces 7 and O in turn with back-end surfaces 7 such as superheater, reheater, economizers
2Preheater 10, deduster 11, flue gas condenser 12 and compressor reducer 14 link to each other in turn, air-separating plant 8 and O
2Preheater 10 links to each other.N
2Recover 9 links to each other with air-separating plant 8, and condensed water recover 13 links to each other with flue gas condenser 12.
Desulfurizing agent in fuel in the Bunker 1 and the desulfurizing agent storehouse 2 is added circulating fluidized bed combustor 3 by charger burn, the heat heating water generates steam that fuel combustion produces is generated electricity; The end slag that produces is discharged in the stove through slag cooler 4 cooling backs; Desulfurizing agent is caught the SO that fuel combustion produces in stove
2Realize desulfuration in furnace, desulfurization product is also discharged in the stove with end slag; The flue gas that produces carries flying dust and enters cyclone separator 5, and a large amount of solid particle enters external heat exchanger 6 heat exchange under separated in cyclone separator 5, and the solid particle after the heat exchange reenters circulating fluidized bed combustor 3 and burns; The flue gas that cyclone separator 5 comes out is successively through entering O after back-end surfaces 7 heat exchange such as superheater, reheater, economizer
2Preheater 10, the O that heating is made by air-separating plant 8 separation of air 8-1
2Behind the 8-2 (concentration is about 97.5%) produce 140 ℃-150 ℃ warm flue gas, with the 30%-70%10-2 in the described temperature flue gas with the O after heating
210-1 mix to divide and to make once oxidation agent 3-1 and secondary oxidation agent 3-2 and get back to and carry out circulating combustion in the CFBC device 3, and remaining temperature flue gas 10-3 is through deduster 11 dedustings, flue gas condenser 12 in by the electric power plant circulating water cooling de-watering, the interior CO of flue gas this moment
2Concentration can reach more than 95%.Use CO
2Compressor reducer 14 will be rich in CO
2Flue gas compression 14-1 be used to improve recycling such as oil field oil recovery or squeeze into discarded gas field or the seabed is sealed up for safekeeping.So form the burning of circulating fluidized bed temperature flue gas recirculation oxygen and caught CO
2Method.
N
2Recover 9 is used for reclaiming the N that air separator produces
2Condenser recover 13 is used for reclaiming the condensed water that flue gas condenser produces.
Claims (3)
1. the method for a reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion, it is characterized in that fuel in the Bunker (1) and the desulfurizing agent in desulfurizing agent storehouse (2) are added recirculating fluidized bed burner hearth (3) burning, the flue gas that is produced is after back-end surfaces (7) heat exchange, the oxygen (8-2) that heating is made by air-separating plant (8) separation of air (8-1) and then to produce temperature be 140 ℃-150 ℃ warm flue gas, with the warm flue gas (10-2) of 30%-70% be divided into once oxidation agent (3-1) and secondary oxidation agent (3-2) after heating back oxygen (10-1) mixes and send back to recirculating fluidized bed burner hearth (3) and carry out circulating combustion, remaining temperature flue gas (10-3) is sent into deduster (11) dedusting, dewater and compressor reducer (14) compression obtains the carbon dioxide (14-1) of volumetric concentration 95% or more realization recycling or seal up for safekeeping then through multi-stage condensing device (12).
2. the method for reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion as claimed in claim 1, it is characterized in that sending back to is that the warm flue gas (10-2) that recirculating fluidized bed burner hearth (3) carries out circulating combustion is rich in steam, carries unburned carbon and active desulfurizing agent secretly.
3. the method for reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion as claimed in claim 1, it is characterized in that by air-separating plant (8) separation of air (8-1) make oxygen (8-2) concentration be 96.5%-98.5%.
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|---|---|---|---|
| CN200910034141A CN101634449A (en) | 2009-09-01 | 2009-09-01 | Method for reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion |
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| CN200910034141A CN101634449A (en) | 2009-09-01 | 2009-09-01 | Method for reducing emission of carbon dioxide by circulating fluidized bed temperature flue gas circulation oxygen combustion |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012037212A (en) * | 2010-08-12 | 2012-02-23 | Ihi Corp | Oxygen flow combustion device in circulating fluidized bed system |
| CN102410552A (en) * | 2011-09-21 | 2012-04-11 | 西安交通大学 | Large-scale centralized preparation system for pulverized coal and distribution method |
| CN102425789A (en) * | 2011-11-03 | 2012-04-25 | 华北电力大学（保定） | Coal-fired fluidized bed micro oxygen rich combustion CO2 emission reduction method and system |
| CN102434357A (en) * | 2011-10-21 | 2012-05-02 | 华北电力大学（保定） | System for generating power employing condensed water of flue gases in supercharged oxygen-enriched coal burning boiler |
| CN102563657A (en) * | 2011-12-02 | 2012-07-11 | 华北电力大学（保定） | Refuse incineration system and refuse incineration method for zero emission of flue gas pollutants |
| CN103216937A (en) * | 2013-04-03 | 2013-07-24 | 清华大学 | Circulating bed organic heat carrier furnace capable of co-producing hot oil and water vapour |
| CN103566712A (en) * | 2012-08-07 | 2014-02-12 | 中国石油化工股份有限公司 | Flue gas carbon dioxide trapping process |
| CN104501176A (en) * | 2014-11-15 | 2015-04-08 | 北京交通大学 | Harmless disposal system for refuse and method for refuse disposal by harmless disposal system |
| CN105525275A (en) * | 2016-01-15 | 2016-04-27 | 上海弘枫实业有限公司 | Carbon-carbon coating device for fluidized-bed furnace |
| CN105864755A (en) * | 2016-03-30 | 2016-08-17 | 中国科学院工程热物理研究所 | Circulating fluidized bed oxygen-enriched combustion device and method |
| CN111237744A (en) * | 2020-01-22 | 2020-06-05 | 王玉琨 | Pure oxygen combustion technology |
| CN113007700A (en) * | 2021-03-24 | 2021-06-22 | 华北电力大学 | Oxygen-enriched combustion system and method for biomass circulating fluidized bed |
| CN117663812A (en) * | 2024-01-31 | 2024-03-08 | 唐山高炬科技开发有限公司 | Efficient enthalpy-increasing power generation method and system for sintering flue gas |
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2009
- 2009-09-01 CN CN200910034141A patent/CN101634449A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012037212A (en) * | 2010-08-12 | 2012-02-23 | Ihi Corp | Oxygen flow combustion device in circulating fluidized bed system |
| CN102410552A (en) * | 2011-09-21 | 2012-04-11 | 西安交通大学 | Large-scale centralized preparation system for pulverized coal and distribution method |
| CN102410552B (en) * | 2011-09-21 | 2013-12-11 | 西安交通大学 | Large-scale centralized preparation system for pulverized coal and distribution method |
| CN102434357A (en) * | 2011-10-21 | 2012-05-02 | 华北电力大学（保定） | System for generating power employing condensed water of flue gases in supercharged oxygen-enriched coal burning boiler |
| CN102425789A (en) * | 2011-11-03 | 2012-04-25 | 华北电力大学（保定） | Coal-fired fluidized bed micro oxygen rich combustion CO2 emission reduction method and system |
| CN102563657A (en) * | 2011-12-02 | 2012-07-11 | 华北电力大学（保定） | Refuse incineration system and refuse incineration method for zero emission of flue gas pollutants |
| CN103566712B (en) * | 2012-08-07 | 2016-03-30 | 中国石油化工股份有限公司 | A kind of smoke carbon dioxide capture technique |
| CN103566712A (en) * | 2012-08-07 | 2014-02-12 | 中国石油化工股份有限公司 | Flue gas carbon dioxide trapping process |
| WO2014161396A1 (en) * | 2013-04-03 | 2014-10-09 | 清华大学 | Circulating bed organic heat carrier furnace for co-producing hot oil and water vapour |
| CN103216937A (en) * | 2013-04-03 | 2013-07-24 | 清华大学 | Circulating bed organic heat carrier furnace capable of co-producing hot oil and water vapour |
| CN104501176A (en) * | 2014-11-15 | 2015-04-08 | 北京交通大学 | Harmless disposal system for refuse and method for refuse disposal by harmless disposal system |
| CN104501176B (en) * | 2014-11-15 | 2016-09-14 | 北京交通大学 | A kind of rubbish processing to be harmless system and the method utilizing this system process rubbish |
| CN105525275A (en) * | 2016-01-15 | 2016-04-27 | 上海弘枫实业有限公司 | Carbon-carbon coating device for fluidized-bed furnace |
| CN105525275B (en) * | 2016-01-15 | 2018-08-17 | 上海弘枫实业有限公司 | Fluid bed furnace carbon carbon coating unit |
| CN105864755A (en) * | 2016-03-30 | 2016-08-17 | 中国科学院工程热物理研究所 | Circulating fluidized bed oxygen-enriched combustion device and method |
| CN111237744A (en) * | 2020-01-22 | 2020-06-05 | 王玉琨 | Pure oxygen combustion technology |
| CN113007700A (en) * | 2021-03-24 | 2021-06-22 | 华北电力大学 | Oxygen-enriched combustion system and method for biomass circulating fluidized bed |
| CN117663812A (en) * | 2024-01-31 | 2024-03-08 | 唐山高炬科技开发有限公司 | Efficient enthalpy-increasing power generation method and system for sintering flue gas |
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Open date: 20100127 |