CN100436940C - Coal-burning installation based on calcium sulphate oxygen carrier and coal burning method - Google Patents
Coal-burning installation based on calcium sulphate oxygen carrier and coal burning method Download PDFInfo
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- CN100436940C CN100436940C CNB2007100199759A CN200710019975A CN100436940C CN 100436940 C CN100436940 C CN 100436940C CN B2007100199759 A CNB2007100199759 A CN B2007100199759A CN 200710019975 A CN200710019975 A CN 200710019975A CN 100436940 C CN100436940 C CN 100436940C
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Abstract
A coal burner based on calcium sulfate oxygen carrier and relative burning method realizes circulated oxygen carrier and the separation of carbon dioxide. The inventive device is formed by a circular fluid bed, a cyclone separator and a fluid bed into a circular loop. And the method comprises that oxidizing the calcium sulfide with air in the circular fluid bed to generate calcium sulfate, and to be separated by the cyclone separator; then the calcium sulfate is fed into the fluid bed; the coal of fluid bed is reacted with carbon monoxide which can reduce the calcium sulfate to generate the carbon dioxide and calcium sulfide, and the carbon dioxide is discharged via the air outlet of fluid bed; and part of carbon dioxide is extracted and circulated into the fluid bed; the reduced calcium sulfide is feedback to the circular fluid bed to be oxidized with the air. The invention can separate the carbon dioxide from the product without additional energy consumption.
Description
Technical field
The present invention is a kind of combustion system of coal, is specially the coal combustion process of realization based on the circulation oxygen carrier, reaches the device and method of isolating carbon dioxide in combustion process.
Background technology
Carbon dioxide is the greenhouse gases that have the greatest impact in many potential greenhouse gases, and how reducing emission of carbon dioxide has become one of main contents of human kind sustainable development from now on.Conventional combustion technology all is fuel and the direct catalytic combustion of air, and carbon dioxide only accounts for 10～15% in the flue gas of generation, and the subsequent treatment of carbon dioxide (concentrate and purify) cost is too high, and following method is arranged usually:
1. by the molecular film separation method carbon dioxide is separated purification processes, its separative efficiency is low and cost is high, adopts the method that carbon dioxide separation in the flue gas is handled as thermal power plant, can increase by 20% cost of electricity-generating.
2. remove carbon dioxide by biological photosynthesis, seek the high-performance bio algae and remove carbon dioxide on a large scale, the technological break-through of still needing.
3. by effective carbon-dioxide solvent or adsorbent technology separating carbon dioxide, await further research.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of coal-burning installation and coal combustion process, carbon dioxide can be separated from combustion product under the prerequisite of extra energy consumption not having based on the circulation oxygen carrier.
Technical scheme: the coal-burning installation based on calcium sulphate oxygen carrier of the present invention, be made up of recirculating fluidized bed, cyclone separator and fluid bed, calcium sulfide and air carry out oxidation reaction in the recirculating fluidized bed, generate calcium sulfate, after cyclone separator separated, calcium sulfate entered fluid bed; Coal and carbon dioxide carry out gasification reaction in fluid bed, generate carbon monoxide, carbon monoxide and calcium sulfate carry out reduction reaction then, generate carbon dioxide and calcium sulfide, carbon dioxide is discharged from the fluid bed exhaust outlet, extracts wherein that partial CO 2 recirculation enters fluid bed, and the calcium sulfide after the reduction turns back to recirculating fluidized bed, carry out oxidation reaction with air, finish the regenerative process of calcium sulfate.
Its concrete structure is: the top of recirculating fluidized bed is connected with the top of cyclone separator, the dipleg of cyclone separator bottom feeds fluid bed, the bottom of cyclone separator is connected with fluid bed by dipleg, and fluid bed is connected with the bottom of recirculating fluidized bed by refeed line; The bottom of recirculating fluidized bed is provided with air intlet, the top of cyclone separator is the oxygen denuded air gas outlet, and the top of fluid bed is provided with exhaust outlet, and the bottom of fluid bed is provided with air inlet, the exhaust outlet on fluid bed top is communicated with the air inlet of fluid bed bottom, and fluid bed bottom or bottom are provided with coal feeding hole; Material is a calcium sulfate particle in the recirculating fluidized bed, and material is the calcium sulfide particle in the fluid bed.
Coal combustion process based on calcium sulphate oxygen carrier of the present invention is: the not direct and air catalytic combustion of coal, but realize the burning of coal process by the alternating oxidation-reduction reaction of calcium sulfate between recirculating fluidized bed and fluid bed, that is: when burning takes place, calcium sulfide and air carry out oxidation reaction in recirculating fluidized bed, generate calcium sulfate particle, calcium sulfate particle is carried by air-flow and enters cyclone separator, carries out gas solid separation, and the calcium sulfate particle that separates enters fluid bed by dipleg; Coal delivers into fluid bed from coal feeding hole, carry out gasification reaction with the carbon dioxide that enters from air inlet in the fluid bed, generate carbon monoxide, carbon monoxide and calcium sulfate carry out reduction reaction then, generate calcium sulfide particle and carbon dioxide, carbon dioxide is discharged from the fluid bed exhaust outlet, extract wherein partial CO 2, enter in the fluid bed from air inlet recirculation, calcium sulfide particle after the reduction turns back to recirculating fluidized bed by refeed line, carry out oxidation reaction with the air that enters from air intlet, finish the regenerative process of calcium sulfate particle; In the combustion reaction process, recirculating fluidized bed is in 1200～900 ℃ of conditions of high temperature, and fluid bed is in 1000～800 ℃ middle temperature state.
Beneficial effect: conventional combustion technology all is fuel and the direct catalytic combustion of air, and carbon dioxide only accounts for 10～15% in the flue gas of generation, and the subsequent treatment of carbon dioxide (concentrate and purify) cost is too high.The invention provides a kind of coal-burning installation and method, carbon dioxide can be separated from combustion product under the condition of energy loss not having based on the circulation oxygen carrier.
The not direct and air catalytic combustion of coal, but realize the burning of coal process by the alternating oxidation-reduction reaction of calcium sulfate between two reactors, promptly under the uniform temperature condition, coal and carbon dioxide carry out gasification reaction, generate carbon monoxide, carbon monoxide and calcium sulfate carry out reduction reaction then, generate calcium sulfide and carbon dioxide, carbon dioxide is directly discharged, can further utilize and handle, calcium sulfide after the reduction contacts with air and carries out oxidation reaction, forms calcium sulfate, finishes the regenerative process of calcium sulfate.
As seen do not having under the prerequisite of energy loss, can isolate carbon dioxide based on the coal indirect burning of calcium sulphate oxygen carrier.How realizing the indirect burning of coal, is the key that realizes coal-fired reducing emission of carbon dioxide, and its device and method has social benefit and prospects for commercial application more widely.
Description of drawings
Fig. 1 is an apparatus structure schematic diagram of the present invention.Recirculating fluidized bed 1 is wherein arranged, calcium sulfate particle 11, cyclone separator 2, dipleg 21, fluid bed 3, calcium sulfide particle 31, refeed line 32, air intlet A, oxygen denuded air gas outlet B, exhaust outlet C, air inlet D, coal feeding hole E.
Specific implementation method
Coal-burning installation based on calcium sulphate oxygen carrier of the present invention connects into a closed circuit by recirculating fluidized bed 1, cyclone separator 2 and fluid bed 3 and is formed.Recirculating fluidized bed 1 top is connected with cyclone separator 2 tops, the bottom of cyclone separator 2 is connected with fluid bed 3 by dipleg 21, fluid bed 3 is connected by the bottom of refeed line 32 with recirculating fluidized bed 1, the bottom of recirculating fluidized bed 1 is provided with air intlet A, the top of cyclone separator 2 is oxygen denuded air gas outlet B, the top of fluid bed 3 is provided with exhaust outlet C, the bottom of fluid bed 3 is provided with air inlet D, the exhaust outlet C on fluid bed 3 tops is communicated with the air inlet D of fluid bed 3 bottoms, and fluid bed 3 bottoms or bottom are provided with coal feeding hole E.
When burning takes place, calcium sulfide and air carry out oxidation reaction in recirculating fluidized bed 1, generate calcium sulfate particle 11, and calcium sulfate particle is carried by air-flow and enters cyclone separator 2, carry out gas solid separation, the calcium sulfate particle that separates enters fluid bed 3 by dipleg 21; Coal delivers into fluid bed 3 from coal feeding hole E, carry out gasification reaction with the carbon dioxide that enters from air inlet D in the fluid bed 3, generate carbon monoxide, carbon monoxide and calcium sulfate carry out reduction reaction then, generate calcium sulfide particle 31 and carbon dioxide, carbon dioxide is discharged from fluid bed exhaust outlet C, extract wherein partial CO 2, enter in the fluid bed 3 from air inlet D recirculation, calcium sulfide particle 31 after the reduction turns back to recirculating fluidized bed 1 by refeed line 32, carry out oxidation reaction with air, finish the regenerative process of calcium sulfate particle; In the combustion reaction process, recirculating fluidized bed 1 is in 1200～900 ℃ of conditions of high temperature, and fluid bed 3 is in 1000～800 ℃ middle temperature state.
Claims (2)
1. coal-burning installation based on calcium sulphate oxygen carrier, comprise recirculating fluidized bed (1), cyclone separator (2) and fluid bed (3), the top that it is characterized in that recirculating fluidized bed (1) is connected with the top of cyclone separator (2), the dipleg (21) of cyclone separator (2) bottom feeds fluid bed (3), the bottom of cyclone separator (2) is connected with fluid bed (3) by dipleg (21), and fluid bed (3) is connected by the bottom of refeed line (32) with recirculating fluidized bed (1); The bottom of recirculating fluidized bed (1) is provided with air intlet (A), the top of cyclone separator (2) is oxygen denuded air gas outlet (B), the top of fluid bed (3) is provided with exhaust outlet (C), the bottom of fluid bed (3) is provided with air inlet (D), the exhaust outlet (C) on fluid bed (3) top is communicated with the air inlet (D) of fluid bed (3) bottom, and fluid bed (3) bottom or bottom are provided with coal feeding hole (E); The interior material of recirculating fluidized bed (1) is calcium sulfate particle (11), and the interior material of fluid bed (3) is calcium sulfide particle (31).
2, a kind of coal combustion process of the coal-burning installation based on calcium sulphate oxygen carrier as claimed in claim 1, it is characterized in that the not direct and air catalytic combustion of coal, but realize the burning of coal process by the alternating oxidation-reduction reaction of calcium sulfate between recirculating fluidized bed (1) and fluid bed (3), that is: when burning takes place, calcium sulfide and air carry out oxidation reaction in recirculating fluidized bed (1), generate calcium sulfate particle (11), calcium sulfate particle is carried by air-flow and enters cyclone separator (2), carry out gas solid separation, the calcium sulfate particle that separates enters fluid bed (3) by dipleg (21); Coal delivers into fluid bed (3) from coal feeding hole (E), carry out gasification reaction with the carbon dioxide that enters from air inlet (D) in the fluid bed (3), generate carbon monoxide, carbon monoxide and calcium sulfate carry out reduction reaction then, generate calcium sulfide particle (31) and carbon dioxide, carbon dioxide is discharged from fluid bed exhaust outlet (C), extract wherein partial CO 2, enter in the fluid bed (3) from air inlet (D) recirculation, calcium sulfide particle (31) after the reduction turns back to recirculating fluidized bed (1) by refeed line (32), carry out oxidation reaction with the air that enters from air intlet (A), finish the regenerative process of calcium sulfate particle; In the combustion reaction process, recirculating fluidized bed (1) is in 1200～900 ℃ of conditions of high temperature, and fluid bed (3) is in 1000～800 ℃ middle temperature state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100199759A CN100436940C (en) | 2007-02-05 | 2007-02-05 | Coal-burning installation based on calcium sulphate oxygen carrier and coal burning method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100199759A CN100436940C (en) | 2007-02-05 | 2007-02-05 | Coal-burning installation based on calcium sulphate oxygen carrier and coal burning method |
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| Publication Number | Publication Date |
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| CN101012929A CN101012929A (en) | 2007-08-08 |
| CN100436940C true CN100436940C (en) | 2008-11-26 |
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| CNB2007100199759A Expired - Fee Related CN100436940C (en) | 2007-02-05 | 2007-02-05 | Coal-burning installation based on calcium sulphate oxygen carrier and coal burning method |
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| CN101713535B (en) * | 2009-11-30 | 2011-05-18 | 重庆大学 | Burning method of gas fuel with ultra-low concentration |
| CN103017155B (en) * | 2012-12-15 | 2015-04-15 | 华中科技大学 | Method and device for desulfurization and decarburization combustion of coal |
| CN103398386B (en) * | 2013-07-08 | 2015-08-26 | 东南大学 | A kind of device and method based on burning chemistry chains disposing sludge |
| CN103353110A (en) * | 2013-07-29 | 2013-10-16 | 东南大学 | Chemical looping combustion method capable of inhibiting oxygen carrier sintering and reducing heat loss |
| CN105126794B (en) * | 2015-07-29 | 2018-02-09 | 昆明理工大学 | A kind of application for the method and the carrier of oxygen that the carrier of oxygen is prepared using wastewater sludge |
| CN111701853B (en) * | 2020-06-23 | 2022-07-01 | 新奥科技发展有限公司 | Fine powder separation device and chemical chain coal gasification system and method |
| CN116425123B (en) * | 2023-04-13 | 2024-09-20 | 中国科学院过程工程研究所 | Device system and method for preparing calcium sulfide by utilizing industrial byproduct gypsum |
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| US4102989A (en) * | 1974-05-15 | 1978-07-25 | Iowa State University Research Foundation, Inc. | Simultaneous reductive and oxidative decomposition of calcium sulfate in the same fluidized bed |
| US5662051A (en) * | 1994-04-13 | 1997-09-02 | Gec Alsthom Stein Industrie | Method of treating solid residue resulting from combustion of a sulfur-containing fuel, and heat treatment apparatus for implementing the method |
| CN1493814A (en) * | 2003-09-08 | 2004-05-05 | 东南大学 | Coal fired serial fluidized bed indirect burning device and method |
| WO2004097297A1 (en) * | 2003-04-29 | 2004-11-11 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Natural Resources | In-situ capture of carbon dioxide and sulphur dioxide in a fluidized bed combustor |
| CN1546905A (en) * | 2003-12-12 | 2004-11-17 | 东南大学 | Indirect combustion apparatus and method for fuel gas circulating fluidized bed |
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| US20050095190A1 (en) * | 2003-06-23 | 2005-05-05 | Anthony Edward J. | Regeneration of calcium oxide or calcium carbonate from waste calcium sulphide |
| CN1702374A (en) * | 2005-06-15 | 2005-11-30 | 东南大学 | Apparatus and process for separating carbon dioxide by coal replacement combustion based on calcium sulfate |
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2007
- 2007-02-05 CN CNB2007100199759A patent/CN100436940C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4102989A (en) * | 1974-05-15 | 1978-07-25 | Iowa State University Research Foundation, Inc. | Simultaneous reductive and oxidative decomposition of calcium sulfate in the same fluidized bed |
| US5662051A (en) * | 1994-04-13 | 1997-09-02 | Gec Alsthom Stein Industrie | Method of treating solid residue resulting from combustion of a sulfur-containing fuel, and heat treatment apparatus for implementing the method |
| WO2004097297A1 (en) * | 2003-04-29 | 2004-11-11 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Natural Resources | In-situ capture of carbon dioxide and sulphur dioxide in a fluidized bed combustor |
| US20050095190A1 (en) * | 2003-06-23 | 2005-05-05 | Anthony Edward J. | Regeneration of calcium oxide or calcium carbonate from waste calcium sulphide |
| CN1493814A (en) * | 2003-09-08 | 2004-05-05 | 东南大学 | Coal fired serial fluidized bed indirect burning device and method |
| CN1546905A (en) * | 2003-12-12 | 2004-11-17 | 东南大学 | Indirect combustion apparatus and method for fuel gas circulating fluidized bed |
| CN1560511A (en) * | 2004-03-04 | 2005-01-05 | 东南大学 | Indirect burning separating carbon dioxide device and method for coal-fired circultating fluidized bed |
| CN1702374A (en) * | 2005-06-15 | 2005-11-30 | 东南大学 | Apparatus and process for separating carbon dioxide by coal replacement combustion based on calcium sulfate |
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| CN101012929A (en) | 2007-08-08 |
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Granted publication date: 20081126 Termination date: 20120205 |