CN216044043U - IGCC system for preparing synthesis gas components by adopting fuel cell - Google Patents
IGCC system for preparing synthesis gas components by adopting fuel cell Download PDFInfo
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- CN216044043U CN216044043U CN202121776701.6U CN202121776701U CN216044043U CN 216044043 U CN216044043 U CN 216044043U CN 202121776701 U CN202121776701 U CN 202121776701U CN 216044043 U CN216044043 U CN 216044043U
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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
Abstract
The utility model discloses an Integrated Gasification Combined Cycle (IGCC) system for preparing synthesis gas components by adopting a fuel cell, which comprises a gasification furnace, a coal gas cooler, a dust removal unit, a desulfurization unit, a high-temperature fuel cell, a combustion chamber, a turbine, a waste heat boiler and a steam turbine which are connected in sequence; the gasification furnace is filled with steam, coal and pure oxygen. The heat value of the synthesis gas entering the IGCC is reduced through the high-temperature fuel cell, steam or inert gases such as N2 and CO2 are prevented from being injected into the synthesis gas to dilute the heat value of the fuel gas, the net power generation efficiency of the system is improved, and the consumption of water, N2, CO2 and the like is reduced. The H2 content of the syngas entering the IGCC is also reduced, reducing the risk of gas turbine combustor nozzle flashback and the like. Meanwhile, the high-temperature fuel cell has higher power generation efficiency, so that the overall net power generation efficiency of the IGCC system can be further improved; the power generation capacity of the high-temperature fuel cell is smaller than that of the gas turbine, and a smaller part of chemical energy of the synthesis gas can be consumed.
Description
Technical Field
The utility model belongs to the field of coal gasification combined cycle systems, and relates to an Integrated Gasification Combined Cycle (IGCC) system for preparing components of synthesis gas by using a fuel cell.
Background
Coal is an important basic energy source in China and also a main source of CO2 emission in China. An Integrated Gasification Combined Cycle (IGCC) is a high-efficiency power generation technology that organically integrates a clean coal gasification technology and a high-efficiency gas-steam combined cycle power generation technology. China builds and puts into production a first set of IGCC demonstration power station with the scale of 25 ten thousand kilowatts in 2012, the design net efficiency is 41%, the environmental protection performance of the actual operation of the power station can reach or even be superior to that of a natural gas combined cycle power station, and the CO2 capture before combustion is implemented on the basis of the IGCC, so that the CO2 capture with low cost can be realized.
The heat value of the synthesis gas generated by coal gasification in the existing IGCC power station is high, in order to reduce NOx emission, the synthesis gas entering a gas turbine needs to be diluted, and the synthesis gas is generally diluted by inert gases such as water vapor, N2 or CO2, so that the power generation efficiency of the IGCC system is reduced, and the material consumption of the system is increased. IGCC has a high H2 content in the synthesis gas, so that a diffusion combustion mode must be adopted to avoid the risk of tempering a nozzle of a combustion chamber of a gas turbine and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide the IGCC system for preparing the components of the synthesis gas by using the fuel cell, thereby avoiding injecting steam or inert gases such as N2, CO2 and the like into the synthesis gas to dilute the heat value of the fuel gas, improving the net power generation efficiency of the system and reducing the consumption of water, N2, CO2 and the like. The H2 content of the synthetic gas entering the IGCC gas turbine is reduced, and the risk of tempering a nozzle of a combustion chamber of the gas turbine is reduced.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
an IGCC system for preparing synthesis gas components by adopting a fuel cell comprises a gasification furnace, a coal gas cooler, a dust removal unit, a desulfurization unit, a high-temperature fuel cell, a combustion chamber, a turbine, a waste heat boiler and a steam turbine which are connected in sequence;
the gasification furnace is filled with steam, coal and pure oxygen.
Preferably, a preheater is provided between the desulfurization unit and the high-temperature fuel cell.
Further, a cold side inlet of the preheater is connected with the desulfurization unit, and a cold side outlet is connected with the input end of the high-temperature fuel cell; the inlet of the hot side of the preheater is connected with the output end of the high-temperature fuel cell, and the outlet of the hot side of the preheater is connected with the combustion chamber.
Preferably, the combustion chamber is connected to a compressor output.
Further, the high-temperature fuel cell is connected with a heat exchanger, a cold end inlet of the heat exchanger is connected with an output end of the gas compressor, and a cold end outlet of the heat exchanger is connected with an input end of the high-temperature fuel cell; the hot end inlet of the heat exchanger is connected with the output end of the high-temperature fuel cell, and the hot end outlet is connected with the combustion chamber.
Preferably, a low-temperature waste heat recovery unit is arranged between the dust removal unit and the desulfurization unit.
Preferably, the gas outlet of the gas cooler is connected with a waste heat boiler.
Preferably, the pure oxygen is generated using a cryogenic air separation system.
Preferably, the output end of the dust removal unit is connected with the gasification furnace.
Preferably, the desulfurization unit is connected with a sulfur recovery unit.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model reduces the heat value of the synthesis gas entering the IGCC gas turbine through the high-temperature fuel cell, avoids injecting steam or inert gases such as N2, CO2 and the like into the synthesis gas to dilute the heat value of the fuel gas, improves the net generating efficiency of the system, and reduces the consumption of water, N2, CO2 and the like. The H2 content of the synthesis gas entering the IGCC gas turbine is also reduced, and the risk of tempering the nozzle of the gas turbine combustion chamber is reduced. Meanwhile, the high-temperature fuel cell has higher power generation efficiency, so that the overall net power generation efficiency of the IGCC system can be further improved; the power generation capacity of the high-temperature fuel cell is smaller than that of the gas turbine, and a smaller part of chemical energy of the synthesis gas can be consumed.
Further, air required by the cathode of the high-temperature fuel cell is extracted from the outlet of the compressor of the gas turbine, and the air is discharged from the cathode and then is injected back into the combustion chamber of the gas turbine, so that the NOx discharge amount of the combustion chamber of the gas turbine can be further reduced.
Furthermore, steam generated by the gas cooler is sent to the waste heat boiler to be overheated continuously and then sent to the steam turbine to generate electricity, so that the generating efficiency of the system is improved.
Furthermore, the output end of the dust removal unit is connected with the gasification furnace, so that the fly ash generated by the dust removal unit can be recycled into the gasification furnace, and the environment pollution caused by the fly ash discharged into the atmosphere is avoided.
Furthermore, the sulfur recovery unit can generate sulfur from the acid gas generated by the desulfurization unit, so that the sulfur is prevented from being discharged into the atmosphere to pollute the environment.
Drawings
FIG. 1 is a schematic diagram of an IGCC system for conditioning syngas components using fuel cells in accordance with the present invention.
Wherein: 1-gasification furnace; 2-cryogenic air separation system; 3-gas cooler; 4-a dust removal unit; 5-a low-temperature waste heat recovery unit; 6-a desulfurization unit; a 7-sulfur recovery unit; 8-a preheater; 9-high temperature fuel cells; 10-a heat exchanger; 11-a combustion chamber; 12-a compressor; 13-turbine; 14-a waste heat boiler; 15-a steam turbine.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the IGCC system for preparing syngas components by using fuel cells according to the present invention includes a gasification furnace 1, a gas cooler 3, a dust removal unit 4, a low-temperature waste heat recovery unit 5, a desulfurization unit 6, a preheater 8, a high-temperature fuel cell 9, a heat exchanger 10, a combustion chamber 11, a turbine 13, a waste heat boiler 14, and a steam turbine 15, which are connected in sequence.
The gasification furnace 1 is communicated with water vapor and coal, the gasification furnace 1 is connected with a cryogenic air separation system 2, and the cryogenic air separation system 2 is used for inputting pure oxygen into the gasification furnace 1.
The gas outlet of the gas cooler 3 is connected with a waste heat boiler, and the steam generated by the gas cooler 3 is sent to the waste heat boiler 14 to be overheated continuously and then sent to the steam turbine 15 to generate electricity, so that the generating efficiency of the system is improved.
The output end of the dust removal unit 4 is connected with the gasification furnace 1, so that the fly ash generated by the dust removal unit 4 can be recycled to the gasification furnace 1, and the environment pollution caused by the fly ash discharged into the atmosphere is avoided.
The desulfurization unit 6 is connected with a sulfur recovery unit 7, and the sulfur recovery unit 7 can generate sulfur from the acidic gas generated by the desulfurization unit 6, so that the environmental pollution caused by the acidic gas discharged into the atmosphere is avoided.
The inlet of the cold side of the preheater 8 is connected with the desulphurization unit 6, and the outlet of the cold side is connected with the input end of the high-temperature fuel cell 9; the inlet of the hot side of the preheater 8 is connected with the output end of the high-temperature fuel cell 9, and the outlet of the hot side is connected with the combustion chamber 11.
The combustion chamber 11 is connected with the output end of a gas compressor 12, the input end of the gas compressor 12 is connected with the atmosphere, the high-temperature fuel cell 9 is connected with a heat exchanger 10, the inlet of the cold end of the heat exchanger 10 is connected with the output end of the gas compressor 12, and the outlet of the cold end is connected with the input end of the high-temperature fuel cell 9; the hot end inlet of the heat exchanger 10 is connected with the output end of the high-temperature fuel cell 9, and the hot end outlet is connected with the combustion chamber 11. Air required by the cathode of the high-temperature fuel cell 9 is extracted from the outlet of the compressor 12 of the gas turbine, and the air is discharged from the cathode and then injected back into the combustion chamber 11, so that the oxygen concentration in the combustion process is reduced, and the NOx emission of the combustion chamber 11 of the gas turbine can be further reduced.
The working process of the IGCC system for preparing the components of the synthesis gas by using the fuel cell in this embodiment is as follows:
coal is pretreated to be sent into a gasification furnace 1, a stream of water vapor is used as a raw material of gasification reaction and is sent into the gasification furnace 1, the coal is gasified and reacted with the water vapor and industrial pure oxygen generated by a cryogenic air separation system 2 in the gasification furnace 1 to generate crude synthesis gas, and ash slag generated in the gasification process is discharged from the gasification furnace 1. The raw synthesis gas is cooled in the gas cooler 3, while steam is produced, which is sent to the waste heat boiler 14 for further superheating and then to the steam turbine 15 for power generation.
The cooled raw synthesis gas passes through the dust removal unit 4 and then is sent to the low-temperature waste heat recovery unit 5, and fly ash generated by the dust removal unit 4 is recycled to the gasification furnace 1. The cooled synthetic gas is sent to a desulfurization unit 6, the acid gas generated by the desulfurization unit 6 is sent to a sulfur recovery unit 7 to generate sulfur, the clean synthetic gas generated by the desulfurization unit 6 is heated in the cold side of a preheater 8 and then is sent to a high-temperature fuel cell 9 as fuel gas to generate power, and the synthetic gas at the outlet of the high-temperature fuel cell 9 enters the hot side of the preheater 8 and then is sent to a combustion chamber 11 of a gas turbine. The compressor 12 of the gas turbine sucks air from the atmosphere, and a share of generated high-pressure air is used as air required by the cathode of the high-temperature fuel cell 9, sent to the cold end of the heat exchanger 10 for preheating and temperature rise, and then sent to the high-temperature fuel cell 9 for reaction. After leaving the high temperature fuel cell 9, the cathode air is sent to the hot end of the heat exchanger 10 to recover heat and then injected into the combustion chamber 11 of the gas turbine. The other air at the outlet of the compressor 12 of the gas turbine is sent into a combustion chamber 11 of the gas turbine, and is combusted with the synthesis gas to generate high-temperature flue gas which is sent into a turbine 13 of the gas turbine to generate power.
The flue gas with higher temperature at the outlet of the turbine 13 of the gas turbine is sent to a waste heat boiler 14, and the steam generated by the waste heat boiler 14 is sent to a steam turbine 15 for power generation.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (5)
1. An IGCC system for preparing synthesis gas components by adopting a fuel cell is characterized by comprising a gasification furnace (1), a gas cooler (3), a dust removal unit (4), a desulfurization unit (6), a high-temperature fuel cell (9), a combustion chamber (11), a turbine (13), a waste heat boiler (14) and a steam turbine (15) which are connected in sequence; a low-temperature waste heat recovery unit (5) is arranged between the dust removal unit (4) and the desulfurization unit (6);
a preheater (8) is arranged between the desulfurization unit (6) and the high-temperature fuel cell (9); the cold side inlet of the preheater (8) is connected with the desulfurization unit (6), and the cold side outlet is connected with the input end of the high-temperature fuel cell (9); the hot side inlet of the preheater (8) is connected with the output end of the high-temperature fuel cell (9), and the hot side outlet is connected with the combustion chamber (11);
the combustion chamber (11) is connected with the output end of a gas compressor (12); the high-temperature fuel cell (9) is connected with a heat exchanger (10), the inlet of the cold end of the heat exchanger (10) is connected with the output end of the air compressor (12), and the outlet of the cold end is connected with the input end of the high-temperature fuel cell (9); the hot end inlet of the heat exchanger (10) is connected with the output end of the high-temperature fuel cell (9), and the hot end outlet is connected with the combustion chamber (11);
the gasification furnace (1) is injected with steam, coal and pure oxygen.
2. An IGCC system for synthesis gas composition with fuel cells according to claim 1, characterised in that the gas outlet of the gas cooler (3) is connected to a waste heat boiler (14).
3. An IGCC system with fuel cell conditioning syngas components according to claim 1, characterized in that pure oxygen is generated with a cryogenic air separation system (2).
4. An IGCC system for conditioning syngas components with fuel cells according to claim 1, characterized in that the output of the dust removal unit (4) is connected to the gasifier (1).
5. An IGCC system for the conditioning of synthesis gas components with fuel cells according to claim 1, characterized in that the desulphurization unit (6) is connected with a sulphur recovery unit (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121776701.6U CN216044043U (en) | 2021-07-30 | 2021-07-30 | IGCC system for preparing synthesis gas components by adopting fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121776701.6U CN216044043U (en) | 2021-07-30 | 2021-07-30 | IGCC system for preparing synthesis gas components by adopting fuel cell |
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| Publication Number | Publication Date |
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| CN216044043U true CN216044043U (en) | 2022-03-15 |
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| CN202121776701.6U Active CN216044043U (en) | 2021-07-30 | 2021-07-30 | IGCC system for preparing synthesis gas components by adopting fuel cell |
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2021
- 2021-07-30 CN CN202121776701.6U patent/CN216044043U/en active Active
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