CN211789285U - Purge gas utilization system based on fuel cell combined power generation - Google Patents
Purge gas utilization system based on fuel cell combined power generation Download PDFInfo
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- CN211789285U CN211789285U CN202020286445.1U CN202020286445U CN211789285U CN 211789285 U CN211789285 U CN 211789285U CN 202020286445 U CN202020286445 U CN 202020286445U CN 211789285 U CN211789285 U CN 211789285U
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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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Abstract
The utility model discloses a purge gas utilizes system based on fuel cell cogeneration, including solid oxide fuel cell electricity generation subsystem and supercritical carbon dioxide cycle electricity generation subsystem, solid oxide fuel cell electricity generation subsystem, including pre-heater, air compressor, air pre-heater, solid oxide fuel cell, dc-to-ac converter, combustion chamber and exhaust-heat boiler, supercritical carbon dioxide cycle electricity generation subsystem, including turbine, regenerator, precooler, compressor and generator. The solid oxide fuel cell power generation subsystem converts the Gibbs free energy in the chemical energy of the combustible gas in the purge gas into electric energy, the unreacted combustible gas is combusted and then generates power through the supercritical carbon dioxide Brayton cycle, and the tail gas is used for preheating the purge gas and air.
Description
Technical Field
The utility model relates to a purge gas utilizes technical field, in particular to purge gas utilizes system based on fuel cell cogeneration.
Background
The purge gas is gas which does not participate in the reaction in the chemical production or gas which is accumulated in chemical equipment or pipelines because the grade is too low and cannot be utilized. Since the purge gas affects the heat transfer effect of the equipment, affects the reaction speed and progress, lowers the production efficiency, etc., the purge gas must be periodically discharged. The purge gas generally contains raw material gas for chemical production, most of the purge gas is combustible gas, the treatment modes of the purge gas are generally three, one is to extract the raw material gas components in the purge gas by pressure swing adsorption or membrane separation, the chemical production is continued after extraction, the process is complex, the second is to produce steam and the like after being directly used as fuel gas to be combusted, the efficiency is lower, and the third is to discharge the purge gas after treatment.
The solid oxide fuel cell has strong adaptability to fuels, can operate under the condition that various fuels comprise carbon-based fuels, can provide high-quality waste heat, realizes cogeneration, and has high fuel utilization rate which reaches about 80 percent.
At present, no report on the utilization of the purge gas with high efficiency by using the solid oxide fuel cell is available.
Disclosure of Invention
In order to overcome the defects of the prior art, the present invention provides a purge gas utilization system based on fuel cell combined power generation, which can realize the efficient utilization of purge gas.
In order to realize the purpose, the utility model discloses a technical scheme is:
a purge gas utilization system based on fuel cell combined power generation comprises a solid oxide fuel cell power generation subsystem and a supercritical carbon dioxide cycle power generation subsystem;
the solid oxide fuel cell power generation subsystem comprises a preheater 1 and an air compressor 2, the cold side outlet of the preheater 1 is communicated with the anode inlet of the solid oxide fuel cell 4, the anode outlet of the solid oxide fuel cell 4 is communicated with the combustion chamber 6, the outlet of the air compressor 2 is communicated with the cold side inlet of the air preheater 3, the cold side outlet of the air preheater 3 is communicated with the cathode inlet of the solid oxide fuel cell 4 to enter, the cathode outlet of the solid oxide fuel cell 4 is communicated with the combustion chamber 6, the outlet of the combustion chamber 6 is communicated with the hot side inlet of the waste heat boiler 7, the hot side outlet of the waste heat boiler 7 is communicated with the hot side inlet of the preheater 1, the hot side outlet of the preheater 1 is communicated with the hot side inlet of the air preheater 3, and the anode electrode and the cathode electrode of the solid oxide fuel cell 4 are communicated;
the supercritical carbon dioxide cycle power generation subsystem comprises a turbine 8, a cold side outlet of a waste heat boiler 7 is communicated with an inlet of the turbine 8, an outlet of the turbine 8 is communicated with a hot side inlet of a heat regenerator 9, a hot side outlet of the heat regenerator 9 is communicated with a hot side inlet of a precooler 10, a hot side outlet of the precooler 10 is communicated with an inlet of a compressor 11, an outlet of the compressor 11 is communicated with a cold side inlet of the heat regenerator 9, a cold side outlet of the heat regenerator 9 is communicated with a cold side inlet of the waste heat boiler 7, and the turbine 8 is connected with the compressor 11 and a generator 12 through a coupler.
The outlet of the cold side of the preheater 1 is communicated with the inlet of the combustion chamber 6.
The cooling medium of the precooler 10 is circulating cooling water.
The air entering the air compressor 2 is in excess with respect to the purge air entering the preheater 1.
The turbine 8 drags the compressor 11 and the generator 12 to rotate through the coupler, the compressor 11 compresses carbon dioxide, and the generator 12 outputs electric power.
A method for utilizing purge gas based on fuel cell cogeneration, comprising the steps of;
the purge gas enters the anode of the solid oxide fuel cell 4 after being preheated by the cold side of the preheater 1, the air enters the cathode of the solid oxide fuel cell 4 after being pressurized by the air compressor 2 and preheated by the air preheater 3, the purge gas and the air react in the solid oxide fuel cell 4, the reacted gas enters the combustion chamber 6 for combustion, if the content of combustible gas in the reacted purge gas is too low to support the combustion, a part of the purge gas directly enters the combustor 6 from the cold side of the preheater 1 to ensure the stable combustion in the combustor 6, the cathode electrode and the anode electrode of the solid oxide fuel cell 4 output power to the inverter 5, the combusted flue gas enters the hot side of the waste heat boiler 7 to heat carbon dioxide at the cold side, the heat-exchanged flue gas enters the preheater 1 to preheat the purge gas and then enters the air preheater 3 to preheat the air, then tail gas is removed for treatment;
the carbon dioxide on the cold side of the waste heat boiler 7 enters the turbine 8 after being heated, the turbine 8 is pushed to do work in a rotating mode, the carbon dioxide which does work enters the hot side of the heat regenerator 9 and exchanges heat with the carbon dioxide on the cold side, the carbon dioxide enters the hot side of the precooler 10 to be further cooled, the cooled carbon dioxide enters the compressor 11 to be pressurized, the pressurized carbon dioxide enters the cold side of the heat regenerator 9 to exchange heat with the carbon dioxide on the hot side, the heated carbon dioxide enters the cold side of the waste heat boiler 7 to be further heated, the heated carbon dioxide enters the turbine 8, and circulation is completed.
The purge gas is preheated to 500 ℃ by a preheater 1, the air is pressurized to 5MPa by an air compressor 2 and preheated to 500 ℃ by an air preheater 3.
The utility model has the advantages that:
the utility model discloses a purge gas utilization system and method based on fuel cell cogeneration when concrete operation, because solid oxide fuel cell converts the gibbs free energy part in the chemical energy of combustible gas in the purge gas into the electric energy through electrochemical reaction, do not receive the restriction of carnot cycle effect, therefore efficient; after unreacted combustible gas in the purge gas is combusted, the supercritical carbon dioxide Brayton cycle is used for generating electricity, when the combustible gas is insufficient, the purge gas can be led to a combustion chamber from the cold side of a preheater, the combustion is ensured, the tail gas is used for preheating the purge gas and air, and the purge gas is fully utilized.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a preheater, 2 is an air compressor, 3 is an air preheater, 4 is a solid oxide fuel cell, 5 is an inverter, 6 is a combustion chamber, 7 is a waste heat boiler, 8 is a turbine, 9-bit regenerator, 10 is a precooler, 11 is a compressor, and 12 is a generator.
Detailed Description
The present invention will be described in further detail with reference to examples.
As shown in fig. 1, the synthetic methanol purge gas, which has a pressure of 5MPa and a temperature of 50 ℃, contains combustible gases such as hydrogen and methane, is preheated to 500 ℃ by a preheater 1, enters an anode of a solid oxide fuel cell 4, air is pressurized to 5MPa by an air compressor 2, is preheated to 500 ℃ by an air preheater 3, enters a cathode of the solid oxide fuel cell 4, the purge gas and the air react in the solid oxide fuel cell 4, the anode electrode and the cathode electrode transmit power to an inverter 5, a certain amount of combustible gases remain in the purge gas after the reaction, a certain amount of oxygen remains in the air after the reaction, the purge gas and the air after the reaction enter a combustion chamber 6, the purge gas burns and releases heat in the combustion chamber 6, if the content of the combustible gases in the purge gas after the reaction is too low to support the combustion, a part of the purge gas directly enters the combustor 6 from a cold side of the preheater 1, the stable combustion in the combustor 6 is guaranteed, the flue gas after combustion enters the hot side of the waste heat boiler 7 to heat the carbon dioxide on the cold side, the flue gas after heat exchange enters the preheater 1 to preheat purge gas, and after preheating purge gas, the flue gas enters the air preheater 3 to preheat air, and then the flue gas is treated by removing tail gas.
The carbon dioxide on the cold side of the waste heat boiler 7 enters the turbine 8 after being heated, the turbine 8 is pushed to rotate to do work, the turbine 8 drags the compressor 11 and the generator 12 to rotate through the coupler, the compressor 11 compresses the carbon dioxide, the generator 12 outputs electric power, the carbon dioxide after doing work enters the hot side of the heat regenerator 9 to exchange heat with the carbon dioxide on the cold side, the carbon dioxide on the hot side enters the hot side of the precooler 10 to be further cooled to exchange heat with circulating cooling water on the cold side, the cooled carbon dioxide enters the compressor 11 to be pressurized, the pressurized carbon dioxide enters the cold side of the heat regenerator 9 to exchange heat with the carbon dioxide on the hot side, the heated carbon dioxide enters the cold side of the waste heat boiler 7 to be further heated, the heated carbon dioxide enters the turbine. The turbine 8 drags the compressor 11 and the generator 12 to rotate through the coupler, the compressor 11 compresses carbon dioxide, and the generator 12 outputs electric power.
Claims (5)
1. A purge gas utilization system based on fuel cell combined power generation is characterized by comprising a solid oxide fuel cell power generation subsystem and a supercritical carbon dioxide cycle power generation subsystem;
the solid oxide fuel cell power generation subsystem comprises a preheater (1) and an air compressor (2), a cold side outlet of the preheater (1) is communicated with an anode inlet of a solid oxide fuel cell (4), an anode outlet of the solid oxide fuel cell (4) is communicated with a combustion chamber (6), an outlet of the air compressor (2) is communicated with a cold side inlet of the air preheater (3), a cold side outlet of the air preheater (3) is communicated with a cathode inlet of the solid oxide fuel cell (4), a cathode outlet of the solid oxide fuel cell (4) is communicated with the combustion chamber (6), an outlet of the combustion chamber (6) is communicated with a hot side inlet of a waste heat boiler (7), a hot side outlet of the waste heat boiler (7) is communicated with a hot side inlet of the preheater (1), a hot side outlet of the preheater (1) is communicated with a hot side inlet of the air preheater (3), the anode electrode and the cathode electrode of the solid oxide fuel cell (4) are communicated with an inverter (5);
the supercritical carbon dioxide cycle power generation subsystem comprises a turbine (8), a cold side outlet of a waste heat boiler (7) is communicated with an inlet of the turbine (8), an outlet of the turbine (8) is communicated with a hot side inlet of a heat regenerator (9), a hot side outlet of the heat regenerator (9) is communicated with a hot side inlet of a precooler (10), a hot side outlet of the precooler (10) is communicated with an inlet of a compressor (11), an outlet of the compressor (11) is communicated with a cold side inlet of the heat regenerator (9), a cold side outlet of the heat regenerator (9) is communicated with a cold side inlet of the waste heat boiler (7), and the turbine (8) is connected with the compressor (11) and a generator (12) through a coupler.
2. The purge gas utilization system based on fuel cell cogeneration according to claim 1, wherein said cold side outlet of the preheater (1) is in communication with the inlet of the combustor (6).
3. The purge gas utilization system based on fuel cell cogeneration according to claim 1, wherein the cooling medium of said precooler (10) is circulating cooling water.
4. A purge gas utilization system based on fuel cell cogeneration according to claim 1, wherein said air compressor (2) enters in excess of the purge gas entering the preheater (1).
5. The purge gas utilization system based on fuel cell cogeneration according to claim 1, wherein said turbine (8) drives a compressor (11) and a generator (12) to rotate through a coupling, the compressor (11) compresses carbon dioxide, and the generator (12) outputs electric power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020286445.1U CN211789285U (en) | 2020-03-10 | 2020-03-10 | Purge gas utilization system based on fuel cell combined power generation |
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| CN202020286445.1U CN211789285U (en) | 2020-03-10 | 2020-03-10 | Purge gas utilization system based on fuel cell combined power generation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114132469A (en) * | 2021-11-29 | 2022-03-04 | 哈尔滨工程大学 | Novel hybrid power device combining Brayton cycle and SOFC |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114132469A (en) * | 2021-11-29 | 2022-03-04 | 哈尔滨工程大学 | Novel hybrid power device combining Brayton cycle and SOFC |
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