CN107829786B - Near-zero emission coal gasification power generation system with pollutant control function and power generation method - Google Patents
Near-zero emission coal gasification power generation system with pollutant control function and power generation method Download PDFInfo
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- CN107829786B CN107829786B CN201711235325.8A CN201711235325A CN107829786B CN 107829786 B CN107829786 B CN 107829786B CN 201711235325 A CN201711235325 A CN 201711235325A CN 107829786 B CN107829786 B CN 107829786B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
- H01M8/0668—Removal of carbon monoxide or carbon dioxide
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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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
- 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
Abstract
A near zero emission coal gasification power generation system with pollutant control and a power generation method, wherein the system comprises: gasifier, gas cooling tower, dust collector, volatile alkali metal remover, desulfurizing device, water-vapor converter and CO 2 The device comprises a separation device, an expander, a fuel cell, a catalytic combustor, a waste heat boiler, a steam turbine, a solid oxide electrolytic cell, an air separation device and a heat exchanger; the invention also discloses a power generation method of the system; through reasonable arrangement of the units, comprehensive utilization of chemical energy, electric energy and heat energy is realized; the invention can realize the control of main pollutants in the coal gasification power generation system and reach CO 2 The purpose of near zero emission is also realized, the multi-energy complementation is realized, and the comprehensive utilization efficiency of the system energy reaches more than 65 percent.
Description
Technical Field
The invention belongs to the technical field of coal gasification power generation, and particularly relates to a near zero emission coal gasification power generation system with pollutant control and a power generation method.
Background
With the use of fossil energy in modern society, energy and environmental problems are increasingly prominent, and clean utilization of fossil energy is urgent. The energy structure of China is rich in coal, lean in gas and less in oil, and the clean utilization technology development of coal plays an important role in relieving or even solving the environmental problem. The coal gasification technology can effectively control the discharge of various pollutants in coal, is a core technology for clean and efficient utilization of coal, and has important significance for solving the energy environment problem.
In the energy consumption structure of China, the proportion of coal is over 70%, and main pollutants generated in the coal utilization process comprise sulfur, nitrogen, chlorine and the like and trace volatile metal elements (such As Hg, pb, as, se and the like). In addition, the greenhouse gas CO 2 Is also one of the major problems of worldwide concern. At present, china has successfully developed a large-scale coal gasification technology, and China patent CN201610562104.0 discloses a technology capable of realizing CO before combustion 2 Captured integrated gasification fuel cell power generation system "that achieves a majority of the CO 2 Is captured in such a way that CO 2 The emission is reduced by 75%, but the waste gas is discharged, and pollutants such As trace volatile metal elements (such As Hg, pb, as, se and the like) are not controlled. Chinese patent CN201610888933.8 discloses an IGCC-based near zero emission coal-fired power generation system and method capable of realizing 90% CO in emission reduction system 2 But NO is present in the system tail gas X Is not beneficial to environmental protection.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the near zero emission coal gasification power generation system with pollutant control and the power generation method, which not only can realize the control of main pollutants in the coal gasification power generation system, but also realize CO 2 The near zero emission of the system is realized, the multi-energy complementation is realized, and the comprehensive utilization efficiency of the system energy reaches more than 65 percent.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a near zero emission coal gasification power generation system with pollutant control comprises a gasification furnace 1, wherein an inlet of the gasification furnace 1 is communicated with reaction raw material coal dust and H 2 O and O 2 The outlet is communicated with the high-temperature gas outlet of the gasification furnace 1, the inlet of the gas cooling tower 2, the high-temperature steam outlet of the gas cooling tower 2, the inlet of the steam turbine 12, the cooling gas outlet of the gas cooling tower 2, the inlet of the dust removing device 3, and the clean gas outlet of the dust removing device 3 are sequentially communicated with the volatile matterThe alkaline metal removing device 4, the desulfurizing device 5, the water vapor converting device 6, the CO2 separating device 7, the expander 8 and the anode side of the fuel cell 9, hot air passing through the third heat exchanger 17 from the blower 13 is introduced into the cathode side of the fuel cell 9, the anode side high-temperature tail gas outlet of the fuel cell 9 is communicated with the inlet of the catalytic combustor 10, the outlet of the catalytic combustor 10 is divided into two paths, one path is communicated with the inlet of the waste heat boiler 11, the other path is communicated with the inlet of the solid oxide electrolytic cell 18, and the gas outlet of the waste heat boiler 11 is communicated with the first heat exchanger 15.
The coal powder of the reaction raw material entering the inlet of the gasification furnace 1 adopts high pressure N from the air separation device 14 2 And (5) conveying.
O entering the inlet of the gasification furnace 1 2 From the air separation unit 14.
According to the power generation method of the near-zero emission coal gasification power generation system with pollutant control, the reaction raw materials of coal dust and H are introduced into the inlet of the gasification furnace 1 2 O and O 2 The reaction raw material coal powder adopts high pressure N from the air separation device 14 2 Transport, O 2 The high-temperature gas generated by the reaction from the air separation device 14 enters the gas cooling tower 2 from the outlet of the gasification furnace 1, high-temperature steam is generated at the top outlet of the gas cooling zone tower 3 and enters the steam turbine 12 to generate power, the cooled gas enters the dust removal device 3, clean gas from the outlet of the dust removal device 3 enters the volatile alkali metal removal device 4 to remove Hg, pb, as and Se pollutants, the gas after removing the volatile alkali metals enters the desulfurization device 5 to complete desulfurization and sulfur recovery, the gas from the desulfurization device 5 enters the water vapor conversion device 6, the CO content in the converted gas is less than 1%, and the converted hydrogen-rich gas enters the CO 2 A separation device 7 for separating CO 2 Collecting CO 2 The hydrogen-rich gas from the separation device 7 is sent to the anode side of the fuel cell device 9 for power generation after passing through the expander 8, hot air passing through the third heat exchanger 17 from the blower 13 is introduced into the cathode side of the fuel cell, electric energy is transmitted to a power grid, high-temperature tail gas from the anode of the fuel cell 9 enters the catalytic combustor 10, and hydrogen which is not fully reacted and O from the air separation device 14 enter the catalytic combustor 2 To react, CO exiting the catalytic burner 10 2 And steamingPart of the gas mixture enters the waste heat boiler 11 to drive the steam turbine 12 to generate electric energy and is transmitted to a power grid, and the other part enters the solid oxide electrolytic cell 18 to generate CO and H 2 The fuel can be used as fuel or for processing other chemicals, and the electric energy of the electrolytic cell is derived from solar energy or wind energy; the gas coming out of the waste heat boiler 11 passes through the first heat exchanger 15 and then is subjected to CO 2 And (5) capturing.
The invention can realize the control of main pollutants in the coal gasification power generation system and reach CO 2 The purpose of near zero emission is also realized, the multi-energy complementation is realized, and the comprehensive utilization efficiency of the system energy reaches more than 65 percent.
Drawings
FIG. 1 is a schematic diagram of a near zero emission coal gasification power generation system with pollutant control in accordance with the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in FIG. 1, the invention provides a near zero emission coal gasification power generation system with pollutant control.
Example 1: in the embodiment, the near zero emission coal gasification power generation system with pollutant control comprises a gasification furnace 1, wherein an inlet of the gasification furnace 1 is communicated with reaction raw material coal dust and H 2 O and O 2 The outlet, the high temperature gas outlet of gasifier 1 communicates the entry of gas cooling tower 2, the high temperature steam outlet of gas cooling tower 2 communicates the entry of steam turbine 12, the cooling gas outlet of gas cooling tower 2 communicates dust collector 3 entry, dust collector 3's clean gas outlet communicates the easy volatile alkali metal removal device 4 in proper order, desulfurization device 5, water vapor shift device 6, CO2 separator 7, expander 8 and the positive pole side of fuel cell 9, the negative pole side of fuel cell 9 lets in the hot air that comes to air-blower 13 through third heat exchanger 17, the positive pole side high temperature tail gas outlet of fuel cell 9 communicates catalytic burner 10 entry, catalytic burner 10's export divides two ways, the waste heat boiler 11 entry of one way intercommunication, the solid oxide electrolysis cell 18 entry of another way, waste heat boiler 11's gas outlet intercommunication first heat exchanger 15..
The reaction raw material coal powder is introduced into the inlet of the gasification furnace 1,H 2 O and O 2 The reaction raw material coal powder adopts high pressure N from the air separation device 14 2 Transport, O 2 The high-temperature gas generated by the reaction from the air separation device 14 enters the gas cooling tower 2 from the outlet of the gasification furnace 1, high-temperature steam is generated at the top outlet of the gas cooling zone and enters the steam turbine 12 to generate power, the cooled gas enters the dust removal device 3, clean gas from the outlet of the dust removal device 3 enters the volatile alkali metal removal device 4 to remove Hg, pb, as, se and other pollutants, the gas after the volatile alkali metal removal enters the desulfurization device 5 to complete desulfurization and sulfur recovery, the gas from the desulfurization device 5 enters the water vapor conversion device 6, the CO content in the converted gas is less than 1%, and the converted hydrogen-rich gas enters the CO 2 A separation device 7 for separating CO 2 Collecting CO 2 The hydrogen-rich gas from the separation device 7 is sent to the anode side of the fuel cell device 9 for power generation after passing through the expander 8, hot air passing through the third heat exchanger 17 from the blower 13 is introduced into the cathode side of the fuel cell, electric energy is transmitted to a power grid, high-temperature tail gas from the anode of the fuel cell 9 enters the catalytic combustor 10, and hydrogen which is not fully reacted and O from the air separation device 14 enter the catalytic combustor 2 To react, CO exiting the catalytic burner 10 2 Part of the mixed gas with the water vapor enters the waste heat boiler 11 to drive the steam turbine 12 to generate electric energy and is transmitted to a power grid, and the other part enters the solid oxide electrolytic cell 18 to generate CO and H 2 Can be used as fuel or for processing other chemicals, and the electric energy of the electrolytic cell is derived from solar energy or wind energy. The gas coming out of the waste heat boiler 11 passes through the first heat exchanger 15 and then is subjected to CO 2 And (5) capturing.
The energy of the main material flow of the system is mainly converted from chemical energy stored in coal into electric energy, the electric energy is converted from two parts, one part is used for generating electricity by a high-temperature fuel cell, and the other part is used for generating electricity by a steam turbine. The power generation efficiency of the high-temperature fuel cell reaches 51%, the heat source of the steam turbine is used for heat exchange of the gas cooling tower 2 on one hand, the power generation efficiency of the waste heat boiler 11 after the catalytic combustor 10 is 31%, the equipment consumption is deducted, and the comprehensive power generation efficiency is 65%. In addition, the system also adopts renewable energy sourcesSolar energy is used as input energy source of solid oxide electrolytic cell, tail waste gas (CO 2 +H 2 O) producing high added value chemicals, realizing multi-energy complementation and achieving the comprehensive utilization efficiency of energy reaching more than 65 percent.
Claims (2)
1. A near zero emission coal gasification power generation system with pollutant control is characterized in that: comprises a gasification furnace (1), wherein the inlet of the gasification furnace (1) is communicated with reaction raw material coal dust and H 2 O and O 2 The outlet is communicated with the inlet of a gas cooling tower (2), the high-temperature steam outlet of the gas cooling tower (2) is communicated with the inlet of a steam turbine (12), the cooling gas outlet of the gas cooling tower (2) is communicated with the inlet of a dust removing device (3), and the clean gas outlet of the dust removing device (3) is sequentially communicated with a volatile alkali metal removing device (4), a desulfurizing device (5), a water vapor conversion device (6) and CO 2 The device comprises a separation device (7), an expander (8) and an anode side of a fuel cell (9), wherein hot air passing through a third heat exchanger (17) from a blower (13) is introduced into a cathode side of the fuel cell (9), a high-temperature tail gas outlet of the anode side of the fuel cell (9) is communicated with an inlet of a catalytic combustor (10), an outlet of the catalytic combustor (10) is divided into two paths, one path is communicated with an inlet of a waste heat boiler (11), the other path is communicated with an inlet of a solid oxide electrolytic cell (18), and a gas outlet of the waste heat boiler (11) is communicated with a first heat exchanger (15);
the reaction raw material coal powder entering the inlet of the gasification furnace (1) adopts high pressure N from an air separation device (14) 2 Conveying;
o entering the inlet of the gasification furnace (1) 2 Is derived from an air separation unit (14).
2. The power generation method of the near zero emission coal gasification power generation system with pollutant control of claim 1, which is characterized by comprising the following steps: the reaction raw material coal dust and H are introduced into the inlet of the gasification furnace (1) 2 O and O 2 The high-temperature gas generated by the reaction enters a gas cooling tower (2) from an outlet of a gasification furnace (1), high-temperature steam generated at the top outlet of the gas cooling tower (2) enters a steam turbine (12) to generate power, the cooled gas enters a dust removing device (3), and clean gas from the outlet of the dust removing device (3) enters volatile alkali metalThe method belongs to a removing device (4), hg, pb, as and Se pollutants are removed, the gas after removing volatile alkali metal enters a desulfurizing device (5) to complete desulfurization and sulfur recovery, the gas coming out of the desulfurizing device (5) enters a water vapor converting device (6), the CO content in the converted gas is less than 1%, and the converted hydrogen-rich gas enters CO 2 A separation device (7) for separating CO 2 Collecting CO 2 The hydrogen-rich gas from the separation device (7) is sent to the anode side of the fuel cell device (9) to generate electricity after passing through the expander (8), hot air from the blower (13) through the third heat exchanger (17) is introduced to the cathode side of the fuel cell, electric energy is transmitted to a power grid, high-temperature tail gas from the anode side of the fuel cell (9) enters the catalytic combustor (10), and hydrogen which is not fully reacted and O from the air separation device (14) enter the catalytic combustor 2 To react, CO coming out of the catalytic burner (10) 2 Part of the mixed gas with the water vapor enters a waste heat boiler (11) to drive a steam turbine (12) to generate electric energy and convey the electric energy to a power grid, and the other part of the mixed gas enters a solid oxide electrolytic cell (18) to generate CO and H 2 The fuel can be used as fuel or for processing other chemicals, and the electric energy of the electrolytic cell is derived from solar energy or wind energy; the gas coming out of the waste heat boiler (11) passes through the first heat exchanger (15) and then is subjected to CO 2 And (5) capturing.
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| CN109301283B (en) * | 2018-09-28 | 2023-09-22 | 中国华能集团清洁能源技术研究院有限公司 | With CO 2 Captured integrated gasification fuel cell system |
| CN109148919B (en) * | 2018-10-11 | 2023-06-09 | 中国华能集团清洁能源技术研究院有限公司 | Integrated coal gasification fuel cell power generation system and method utilizing gas high-temperature sensible heat |
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| CN110156047B (en) * | 2019-05-27 | 2020-10-23 | 福州大学化肥催化剂国家工程研究中心 | Solid oxide electrolysis/fossil fuel ammonia synthesis coupling ammonia synthesis method |
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