CN116864756A - Methanol solid oxide fuel cell power generation system - Google Patents
Methanol solid oxide fuel cell power generation system Download PDFInfo
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- CN116864756A CN116864756A CN202310486297.6A CN202310486297A CN116864756A CN 116864756 A CN116864756 A CN 116864756A CN 202310486297 A CN202310486297 A CN 202310486297A CN 116864756 A CN116864756 A CN 116864756A
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- fuel cell
- solid oxide
- oxide fuel
- cell stack
- power generation
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 285
- 239000000446 fuel Substances 0.000 title claims abstract description 170
- 239000007787 solid Substances 0.000 title claims abstract description 147
- 238000010248 power generation Methods 0.000 title claims abstract description 65
- 239000007789 gas Substances 0.000 claims abstract description 86
- 239000002737 fuel gas Substances 0.000 claims abstract description 75
- 239000007800 oxidant agent Substances 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 230000001590 oxidative effect Effects 0.000 claims abstract description 18
- 238000003487 electrochemical reaction Methods 0.000 claims abstract description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 238000010438 heat treatment Methods 0.000 claims description 31
- 230000007246 mechanism Effects 0.000 claims description 29
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 23
- 239000001569 carbon dioxide Substances 0.000 claims description 23
- 239000001257 hydrogen Substances 0.000 claims description 22
- 229910052739 hydrogen Inorganic materials 0.000 claims description 22
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 12
- 238000001833 catalytic reforming Methods 0.000 claims description 3
- 239000008400 supply water Substances 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
- 150000002431 hydrogen Chemical class 0.000 description 10
- 239000000047 product Substances 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 239000012528 membrane Substances 0.000 description 8
- 238000003860 storage Methods 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 238000002407 reforming Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- MEUKEBNAABNAEX-UHFFFAOYSA-N hydroperoxymethane Chemical compound COO MEUKEBNAABNAEX-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000010763 heavy fuel oil Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- -1 oxygen ion Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920005597 polymer membrane Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- 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
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1009—Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
- H01M8/1011—Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
-
- 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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04014—Heat exchange using gaseous fluids; Heat exchange by combustion of reactants
-
- 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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04037—Electrical heating
-
- 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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04067—Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
-
- 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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04097—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the reactants
-
- 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
- H01M8/0606—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants
- H01M8/0612—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants from carbon-containing material
- H01M8/0618—Reforming processes, e.g. autothermal, partial oxidation or steam reforming
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Energy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel Cell (AREA)
Abstract
The present disclosure provides a methanol solid oxide fuel cell power generation system comprising: a power generation assembly having an operating condition in which an electrochemical reaction is performed by a gaseous oxidant and a fuel gas to output electric energy; a heat replenishment assembly configured to heat the oxidant and fuel gas to a reaction temperature at which the electrochemical reaction occurs to bring the power generation assembly to an operating condition; an exhaust treatment assembly configured to separate products in the exhaust of the power generation assembly and to deliver a portion of the products into the power generation assembly to adjust operating conditions; the energy cascade utilization is adopted according to the operation conditions of different devices, the high-temperature tail gas heat of the solid oxide fuel cell stack is reasonably distributed, the operation efficiency and the fuel utilization rate of the system are improved, and the efficient cleaning, the rapid response and the stable and durable power supply of the methanol solid oxide fuel cell power generation system can be realized.
Description
Technical Field
The present disclosure relates to the field of fuel cell technology, and more particularly, to a methanol solid oxide fuel cell power generation system.
Background
In the technical field of power generation, the fuel cell technology has been greatly developed in the last two decades, has good results in membrane electrode materials, bipolar plates, packaging, systems and the like, and is gradually put into use in life and production, and especially, the alkaline fuel cell and the proton exchange membrane fuel cell realize commercial development. The solid oxide fuel cell also receives attention from researchers due to its specific advantages, such as no noble metal, higher efficiency, and wide range of fuel applications.
In the application of the fuel cell, the hydrogen is used as the zero-carbon fuel, and compared with other hydrocarbon fuels, the fuel cell has the advantages of no toxicity, no carbon emission, good durability and the like. However, due to the factors of inconvenient storage of hydrogen, inflammability, explosiveness, high storage and transportation cost and the like, the large-scale popularization of the hydrogen fuel cell is influenced to a certain extent. Methanol is used as a low-carbon liquid fuel, has the advantages of easy storage, high energy density, small hydrocarbon ratio, low storage and transportation cost, mature market scale and the like, and has good prospect in production and life as a fuel of a solid oxide fuel cell.
At present, methanol is used as fuel of a solid oxide fuel cell, and a plurality of problems need to be solved. For example, carbon deposition of methanol on the solid oxide fuel cell, coupling of high temperature operation of the solid oxide fuel cell with low temperature pyrolysis of methanol, influence of decomposition products of methanol under different loads on stack performance, and the like.
Disclosure of Invention
In order to solve at least one technical problem of the foregoing and other aspects in the prior art, the present disclosure provides a methanol solid oxide fuel cell power generation system, which heats a fuel gas through a heat supply assembly to realize coupling of high-temperature operation of a solid oxide fuel cell stack and low-temperature pyrolysis of methanol, and fully converts the methanol to reduce the concentration of carbon monoxide in the fuel gas; the tail gas treatment assembly is used for treating the tail gas of the solid oxide fuel cell stack, so that a part of the tail gas is conveyed into the solid oxide fuel cell stack, and the adjustment of the output power of the solid oxide fuel cell stack under different loads is met.
One aspect of an embodiment of the present disclosure provides a methanol solid oxide fuel cell power generation system comprising: a power generation assembly having an operating condition in which an electrochemical reaction is performed by a gaseous oxidant and a fuel gas to output electric energy; a heat replenishment assembly configured to heat the oxidant and the fuel gas to a reaction temperature at which the electrochemical reaction proceeds to bring the power generation assembly to the operating condition; and an exhaust treatment assembly configured to separate products from the exhaust of the power generation assembly and to deliver a portion of the products into the power generation assembly to regulate the operating conditions.
According to some embodiments of the present disclosure, the above-described power generation assembly includes: a solid oxide fuel cell stack; an air supply mechanism configured to be connected to an air inlet end of a cathode of the solid oxide fuel cell stack, and adapted to supply the oxidizing agent to the solid oxide fuel cell stack; a fuel gas supply mechanism configured to be connected to an intake end of an anode of the solid oxide fuel cell stack, and adapted to supply the fuel gas to the solid oxide fuel cell stack; the solid oxide fuel cell stack serves as a means for performing an electrochemical reaction between the oxidant and the fuel gas, and outputs electric power.
According to some embodiments of the disclosure, the air supply mechanism includes: an air source configured to communicate with an air inlet end of a cathode of the solid oxide fuel cell stack, and adapted to supply air serving as the oxidizing agent to the solid oxide fuel cell stack.
According to some embodiments of the present disclosure, the above-described fuel gas supply mechanism includes: a first methanol supply mechanism configured to supply methanol gas; a water supply mechanism configured to supply water vapor; and a reformer, an air inlet end of which is configured to be connected to the first methanol supply means and the water supply means, and an air outlet end of which is configured to be connected to an air inlet end of an anode of the solid oxide fuel cell stack, and which is adapted to cause the catalytic reforming reaction between the methanol gas and the steam to supply the fuel gas to the solid oxide fuel cell stack.
According to some embodiments of the present disclosure, the heat replenishment assembly includes: a heating section serving as a heat source; and a heat exchange unit which is disposed in communication with the heating unit and is adapted to exchange heat between the heat exchange medium heated by the heating unit and the oxidizing agent and/or the fuel gas so that the oxidizing agent and/or the fuel gas is heated to the reaction temperature.
According to some embodiments of the disclosure, the heating portion includes a burner or an electric heater.
According to some embodiments of the disclosure, the heat exchange section includes at least one air preheater; the air supply side of the air preheater is arranged between the air source and the solid oxide fuel cell stack so as to be communicated with the air source and the air inlet end of the cathode of the solid oxide fuel cell stack, and the medium side of the air preheater is arranged to be communicated with the air outlet end of the cathode of the solid oxide fuel cell stack and/or the heating part so as to exchange heat with the air in the air supply side through tail gas generated by the solid oxide fuel cell stack or a heat exchange medium generated by the heating part.
According to some embodiments of the disclosure, a plurality of the air preheaters disposed in sequence between the air source and the solid oxide fuel cell stack are configured to stage heat the air.
According to some embodiments of the present disclosure, the heat exchanging part includes at least one fuel gas heat exchanger; the gas supply side of the fuel gas heat exchanger is disposed between the reformer and the solid oxide fuel cell stack so as to communicate the reformer with the gas inlet end of the anode of the solid oxide fuel cell stack, and the medium side of the fuel gas heat exchanger is disposed so as to communicate with the gas outlet end of the anode of the solid oxide fuel cell stack and/or the heating section so as to exchange heat with the fuel gas in the gas supply side through the exhaust gas generated by the solid oxide fuel cell stack or the heat exchange medium generated by the heating section.
According to some embodiments of the present disclosure, the exhaust gas treatment assembly includes: and a carbon dioxide separator adapted to separate at least a portion of carbon dioxide in the tail gas of the solid oxide fuel cell stack and adjustably deliver the carbon dioxide to the reformer to increase the hydrogen content in the fuel gas.
According to the methanol solid oxide fuel cell power generation system, the fuel gas is heated through the heat supply assembly, so that the coupling between the high-temperature operation of the solid oxide fuel cell and the low-temperature pyrolysis of the methanol is realized, the methanol is fully converted, the concentration of carbon monoxide in the fuel gas is reduced, and the carbon deposition in a solid oxide fuel cell stack is reduced; and the tail gas of the solid oxide fuel cell stack is treated through the tail gas treatment assembly, so that part of the tail gas is conveyed to the solid oxide fuel cell stack, residual fuel gas and water in the tail gas are recovered, and the energy utilization rate of the methanol solid oxide fuel cell power generation system and the cyclic utilization of the water are improved.
Drawings
FIG. 1 is a block diagram of a methanol solid oxide fuel cell power generation system in accordance with an exemplary embodiment of the present disclosure; and
fig. 2 is a block diagram of a methanol solid oxide fuel cell power generation system in accordance with another exemplary embodiment of the present disclosure.
In the drawings, the reference numerals have the following meanings:
1. a solid oxide fuel cell stack;
2. an air source;
3. a blower;
4. a first methanol source;
5. a first methanol pump;
6. a first evaporator;
7. a water storage tank;
8. a water pump;
9. a second evaporator;
10. a reformer;
11. a burner;
12. a second methanol source;
13. a second methanol pump;
14. a first air preheater;
15. a second air preheater;
16. a fuel gas heat exchanger;
17. a carbon dioxide separator;
18. a gas-water separator;
19. a hydrogen separator;
20. a three-way valve;
21. a first valve;
22. a second valve;
23. a third valve;
24. a fourth valve;
25. a fifth valve;
26. a sixth valve;
27. a seventh valve;
28. an electric heater;
29. a battery pack;
30. an eighth valve;
31. a ninth valve;
32. a tenth valve;
33. an eleventh valve;
34. a twelfth valve.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. This disclosure may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
For the convenience of those skilled in the art to understand the technical solutions of the present disclosure, the following technical terms will be explained.
Where expressions like at least one of "A, B and C, etc. are used, the expressions should generally be interpreted in accordance with the meaning as commonly understood by those skilled in the art (e.g.," a system having at least one of A, B and C "shall include, but not be limited to, a system having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a formulation similar to at least one of "A, B or C, etc." is used, in general such a formulation should be interpreted in accordance with the ordinary understanding of one skilled in the art (e.g. "a system with at least one of A, B or C" would include but not be limited to systems with a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).
According to the invention conception of one aspect of the disclosure, in order to solve the problem of coupling between high-temperature operation of the solid oxide fuel cell stack and low-temperature pyrolysis of methanol, which is encountered when methanol is used for the solid oxide fuel cell stack, and to improve the energy conversion efficiency and the fuel utilization rate, the invention adopts the heat supply assembly to heat the oxidant and the fuel gas to the reaction temperature for performing the electrochemical reaction so as to enable the power generation assembly to reach the operation working condition, and simultaneously, the heat supply assembly provides additional heat input so that the power generation system of the methanol solid oxide fuel cell is maintained in a good state, the stability and the durability of the power generation system of the methanol solid oxide fuel cell are improved, the products in the tail gas of the power generation assembly are separated through the tail gas treatment assembly, the auxiliary adjustment of the methanol reforming process under different operation working conditions and the recovery of hydrogen and water in the tail gas can be realized, the fuel utilization rate is improved, and the cost is saved.
Fig. 1 is a block diagram of a methanol solid oxide fuel cell power generation system in accordance with an exemplary embodiment of the present disclosure.
According to an embodiment of the present disclosure, as shown in fig. 1, a power generation system of a methanol solid oxide fuel cell includes a power generation assembly, a heat replenishment assembly, and an exhaust gas treatment assembly. The power generation assembly has an operating condition in which electrochemical reactions are performed by gaseous oxidants and fuel gases to output electrical energy. The heat replenishment assembly is configured to heat the oxidant and fuel gas to a reaction temperature at which the electrochemical reaction occurs to bring the power generation assembly to operating conditions. The tail gas treatment assembly is configured to separate products in the tail gas of the power generation assembly and to deliver a portion of the products into the power generation assembly to regulate the operating conditions.
According to an embodiment of the present disclosure, the heat replenishing assembly includes a combustor 11, a second methanol source 12, a second methanol pump 13, a first air preheater 14, a second air preheater 15, and a fuel gas heat exchanger 16.
According to an embodiment of the present disclosure, the tail gas treatment assembly includes a carbon dioxide separator 17, a gas-water separator 18, and a hydrogen separator 19.
According to the power generation system of the methanol solid oxide fuel cell, provided by the embodiment of the disclosure, the heat supply assembly is utilized to heat the oxidant and the fuel gas to the reaction temperature for electrochemical reaction, so that the power generation assembly reaches the operation condition, meanwhile, the heat supply assembly provides additional heat input to enable the power generation system of the methanol solid oxide fuel cell to be maintained in a good state, the stability and durability of the power generation system of the methanol solid oxide fuel cell are improved, products in the tail gas of the power generation assembly are separated through the tail gas treatment assembly, partial products in the tail gas can be recycled to adjust the operation condition of the power generation assembly, the operation efficiency of the power generation system of the methanol solid oxide fuel cell and the utilization ratio of fuel are improved, and the cost is saved. Meanwhile, the high-efficiency cleaning, the quick response and the stable and durable power supply of the methanol solid oxide fuel cell power generation system can be realized.
According to an embodiment of the present disclosure, the power generation assembly includes a solid oxide fuel cell stack 1, an air supply mechanism, and a fuel gas supply mechanism. The air supply mechanism is configured to be connected to an air inlet end of the cathode of the solid oxide fuel cell stack 1, and is adapted to supply an oxidizing agent to the solid oxide fuel cell stack 1. The fuel gas supply mechanism is configured to be connected to an intake end of an anode of the solid oxide fuel cell stack 1, and is adapted to supply the fuel gas to the solid oxide fuel cell stack 1. The solid oxide fuel cell stack 1 serves as a device for performing an electrochemical reaction between an oxidant and a fuel gas, and converts chemical energy into electric energy to output electric energy.
According to an embodiment of the present disclosure, the air supply mechanism comprises an air source 2. The air source 2 is arranged in communication with the air inlet end of the cathode of the solid oxide fuel cell stack 1 and is adapted to supply air as an oxidant to the solid oxide fuel cell stack 1.
According to an embodiment of the present disclosure, the air supply mechanism further comprises a blower 3, the blower 3 being configured to be connected to the air source 2. The fan 3 is adapted to pressurize and blow out air.
According to an embodiment of the present disclosure, the fuel gas supply mechanism includes a first methanol supply mechanism, a water supply mechanism, and a reformer 10. The first methanol supply mechanism is configured to supply methanol gas. The water supply mechanism is configured to provide water vapor. The gas inlet end of the reformer 10 is configured to be connected to the first methanol supply mechanism and the water supply mechanism, and the gas outlet end of the reformer 10 is configured to be connected to the gas inlet end of the anode of the solid oxide fuel cell stack 1, and is adapted to perform a catalytic reforming reaction of methanol gas and water vapor to supply fuel gas (the fuel gas includes hydrogen and carbon monoxide) to the solid oxide fuel cell stack 1.
According to an embodiment of the present disclosure, the first methanol supply mechanism includes a first methanol source 4, a first methanol pump 5, and a first evaporator 6.
According to an embodiment of the present disclosure, the first methanol pump 5 is configured to be connected to the first methanol source 4, the first evaporator 6 is configured to be connected to the first methanol pump 5, the first evaporator 6 is adapted to heat methanol to a gaseous state at a temperature of 250-400 ℃ and a boiling point of 64.7 ℃ at normal pressure of methanol.
According to an embodiment of the present disclosure, the water supply mechanism includes a water storage tank 7, a water pump 8, and a second evaporator 9.
According to an embodiment of the present disclosure, the water pump 8 is configured to be connected to the water storage tank 7, the second evaporator 9 is configured to be connected to the water pump 8, and the second evaporator 9 is adapted to heat water to a gaseous state at a temperature of 250-400 ℃.
According to the embodiment of the disclosure, air can provide different pressure environments for the power generation system of the methanol oxide fuel cell through the fan 3, the methanol through the first methanol pump 5 and the water through the water pump 8, and the flow rate is controlled through the flowmeter.
According to an embodiment of the present disclosure, the methanol gas and the water vapor are mixed at the three-way valve 20, and the intake port of the reformer 10 receives the mixture of the methanol gas and the water vapor.
According to embodiments of the present disclosure, the methanol gas and steam are reformed in the reformer 10 with some other side reactions, ultimately forming the main product CO 2 、H 2 And small amounts of CO, but also very rare methanol gas. The reaction equation is as follows:
wherein the reaction is a decomposition reaction.
Wherein the reaction is water gas shift.
According to an embodiment of the present disclosure, the Cu-based catalyst Cu/ZnO/Al used in the reformer 10 2 O 3 Cu-based catalyst Cu/ZnO/Al 2 O 3 The three-way catalyst is used for basically and completely converting methanol gas under the conditions that the water-alcohol ratio is 1.43 and the temperature is 230 ℃, the yield of hydrogen is 71% -76%, and the concentration of carbon monoxide can be as low as 0.05%.
In such embodiments, substantially complete conversion of methanol gas may be achieved, reducing the concentration of carbon monoxide, and reducing carbon deposition of methanol on the solid oxide fuel cell.
According to an embodiment of the present disclosure, the single cells of the solid oxide fuel cell stack 1 employ an anode support structure of an oxygen ion conducting electrolyte, and the membrane electrode is NiO-YSZ/CGO/LSCF-CGO.
According to an embodiment of the present disclosure, the methanol reforming mixture enters the heat exchanger 16 to absorb heat and raise the temperature to the reaction temperature level of the solid oxide fuel cell stack 1, and then an electrochemical reduction reaction is performed at the anode of the solid oxide fuel cell stack 1. Air is taken as an oxidant to enter the air inlet end of the cathode of the solid oxide fuel cell stack 1, oxygen is subjected to oxidation reaction at the cathode to obtain electrons sent by an external circuit, and the circuit is closed.
According to an embodiment of the present disclosure, the cathode reaction formula of the solid oxide fuel cell stack 1 is as follows:
O 2 +4e - →2O 2- (3)
The anode reaction formula of the solid oxide fuel cell stack 1 is as follows:
2H 2 +2O 2- →4e - +2H 2 o type (4)
CO+2O 2- →4e - +CO 2 (5)
According to an embodiment of the present disclosure, a heat supplementing assembly includes a heating part and a heat exchanging part. The heating portion serves as a heat source. The heat exchange part is configured to be communicated with the heating part and is suitable for carrying out heat exchange on the heat exchange medium heated by the heating part and the oxidant and/or the fuel gas so as to heat the oxidant and/or the fuel gas to the reaction temperature.
According to an embodiment of the present disclosure, the heat exchange section comprises at least one air preheater. The air supply side of the air preheater is arranged between the air source 2 and the solid oxide fuel cell stack 1 to communicate the air source 2 with the air inlet end of the cathode of the solid oxide fuel cell stack 1, and the medium side of the air preheater is configured to communicate with the air outlet end and/or the heating part of the cathode of the solid oxide fuel cell stack 1 to exchange heat with the air in the air supply side through the exhaust gas generated by the solid oxide fuel cell stack 1 or the heat exchange medium generated by the heating part.
According to an embodiment of the present disclosure, a power generation system of a methanol solid oxide fuel cell includes a plurality of air preheaters sequentially disposed between an air source 2 and a solid oxide fuel cell stack 1, configured to heat air in stages.
According to an embodiment of the present disclosure, the air preheater comprises a first air preheater 14 and a second air preheater 15.
According to an embodiment of the present disclosure, as shown in fig. 1, the first air preheater 14 is configured to be connected to the blower 3, and adapted to heat the air to 300-400 ℃. The second air preheater 15 is configured to be connected to the first air preheater 14 and adapted to reheat the air to a temperature of 700 c to 850 c.
In such an embodiment, the air enters the air inlet end of the cathode of the solid oxide fuel cell stack 1 after two-stage heating, the temperature is increased from normal temperature to the operation temperature of the solid oxide fuel cell stack 1, and the two-stage heating avoids the situation that the first air preheater 14 and the second air preheater 15 reduce the durability of the equipment due to thermal stress caused by overlarge temperature difference.
According to an embodiment of the present disclosure, a first valve 21 is provided between the outlet end of the cathode of the solid oxide fuel cell stack 1 and the media side of the second air preheater 15.
According to the embodiment of the disclosure, air enters the air inlet end of the cathode of the solid oxide fuel cell stack 1 after two-stage heating, flows out of the cathode after oxidation reaction of the cathode of the solid oxide fuel cell stack 1, and tail gas flowing out of the cathode of the solid oxide fuel cell stack 1 flows into the first air preheater 14 and the second air preheater 15 through the first valve 21, exchanges heat with air in the air supply side of the first air preheater 14 and the second air preheater 15, provides necessary heat input for temperature rise of the air, and then the tail gas is discharged into the atmosphere.
According to an embodiment of the present disclosure, the heat exchange portion includes at least one fuel gas heat exchanger 16. The gas supply side of the fuel gas heat exchanger 16 is disposed between the reformer 10 and the solid oxide fuel cell stack 1 to communicate the reformer 10 with the gas inlet end of the anode of the solid oxide fuel cell stack 1, and the medium side of the fuel gas heat exchanger 16 is configured to communicate with the gas outlet end and/or the heating portion of the anode of the solid oxide fuel cell stack 1 to exchange heat with the fuel gas in the gas supply side through the heat exchange medium generated by the exhaust gas or the heating portion generated by the solid oxide fuel cell stack 1.
According to an embodiment of the present disclosure, the fuel gas heat exchanger 16 is adapted to heat the fuel gas from a medium low temperature (200 ℃ C. To 350 ℃ C.) to a high temperature state (700 ℃ C. To 850 ℃ C.).
According to an embodiment of the present disclosure, a second valve 22 is provided between the outlet end of the anode of the solid oxide fuel cell stack 1 and the media side of the fuel gas heat exchanger 16.
According to the embodiment of the disclosure, the fuel gas enters the air inlet end of the anode of the solid oxide fuel cell stack 1 after being heated by the fuel gas heat exchanger 16, flows out of the anode after undergoing a reduction reaction at the anode of the solid oxide fuel cell stack 1, and the tail gas flowing out of the anode of the solid oxide fuel cell stack 1 flows into the fuel gas heat exchanger 16 through the second valve 22 to exchange heat with the fuel gas in the air supply side of the fuel gas heat exchanger 16. At the same time, the tail gas also flows into the reformer 10, the first evaporator 6 and the second evaporator 9. The tail gas is used as heat supply to heat the reformer 10, the first evaporator 6 and the second evaporator 9, so that the temperature balance and stable operation of each device are ensured.
According to an embodiment of the present disclosure, the heating part includes a burner 11, a second methanol source 12, and a second methanol pump 13.
According to an embodiment of the present disclosure, as shown in fig. 1, the second methanol pump 13 is configured to be connected to the second methanol source 12, the burner 11 is configured to be connected between the second methanol pump 13 and the solid oxide fuel cell stack 1, and the second methanol source 12 is adapted to directly supply fuel to the burner 11. The burner 11 is only used during the start-up phase and low load phase of the power generation system of the methanol oxide fuel cell, and additional heat supplement is generated by the combustion of methanol to provide heat demand for the plant.
According to an embodiment of the present disclosure, as shown in fig. 1, a third valve 23 is provided between the burner 11 and the second methanol pump 13, a fourth valve 24 is provided between the outlet end of the cathode of the solid oxide fuel cell stack 1 and the burner 11, and a fifth valve 25 is provided between the outlet end of the anode of the solid oxide fuel cell stack 1 and the burner 11.
According to embodiments of the present disclosure, when the system is started, each device is at normal temperature, requiring additional heat to heat the system to the normal operating temperature range. The first methanol pump 5 and the water pump 8 are kept off, the blower 3 is turned on, air enters the air inlet end of the cathode of the solid oxide fuel cell stack 1 through two-stage heating and flows to the burner 11, and the second methanol pump 13, the third valve 23, the fourth valve 24 and the fifth valve 25 are turned on. Methanol is injected into the burner 11 and combusted with air therein to produce high temperature flue gas. The high-temperature flue gas flows from the gas outlet end of the burner 11 to the air preheater and the fuel gas heat exchanger 16 respectively, and exchanges heat with air in the gas supply side of the air preheater and air in the gas supply side of the fuel gas heat exchanger 16 respectively. At the same time, the high temperature flue gas flows to the reformer 10, the first evaporator 6 and the second evaporator 9, and the reformer 10, the first evaporator 6 and the second evaporator 9 are preheated to the operating temperature. After each plant has reached operating temperature, the burner 11 and the second methanol pump 13 are turned off.
In such an embodiment, the increase or decrease of the load of the power generation system of the methanol solid oxide fuel cell controls the reaction rate and the output power of the solid oxide fuel cell stack 1 mainly by the injection amount of methanol, but the decrease of methanol causes the decrease of the exhaust amount of the solid oxide fuel cell stack 1, the decrease of the heat input to each device causes the decrease of the device temperature, the deterioration of the effect of the methanol reforming process also causes the increase of the amount of methanol entering the solid oxide fuel cell stack 1, the carbon poisoning of the solid oxide fuel cell stack 1 caused by long-time operation, and the like, shortening the service life of the system. Therefore, the burner 11 can be started to provide necessary heat supplement, the temperature stability of each device of the system is maintained, and finally, the stable output is realized as soon as possible under the condition of changing working conditions.
According to an embodiment of the present disclosure, the tail gas treatment assembly comprises a carbon dioxide separator 17. The tail gas treatment assembly is arranged behind the heat exchange part, the air inlet end of the carbon dioxide separator 17 is configured to be connected with the second evaporator 9, the air outlet end of the carbon dioxide separator 17 is configured to be connected with the air inlet end of the reformer 10, and the tail gas treatment assembly is suitable for separating at least part of carbon dioxide in the tail gas of the solid oxide fuel cell stack 1 and adjustably conveying the carbon dioxide to the reformer 10 so as to improve the hydrogen content in fuel gas.
According to the embodiment of the present disclosure, the carbon dioxide separator 17 adopts a membrane separation technology, and the separation membrane adopts an organic polymer membrane, so that the carbon dioxide separator has better carbon dioxide selectivity and permeability in a low-temperature environment.
According to the embodiment of the present disclosure, the carbon dioxide gas in the carbon dioxide separator 17 needs to adjust the recovery utilization amount of carbon dioxide according to the system load and the factors of the temperature, the methanol content, the water vapor content, and the like in the reformer 10.
According to an embodiment of the present disclosure, a sixth valve 26 is provided between the carbon dioxide separator 17 and the inlet end of the reformer 10.
In such an embodiment, when the system needs to be reduced, due to the thermal inertia of the system high Wen Guyou, the sixth valve 26 is opened to remove CO from the carbon dioxide separator 17 2 Blowing into the reformer 10, the reforming process of the methanol gas and the water vapor is slowed down, so that the density of the hydrogen entering the solid oxide fuel cell stack 1 is reduced, the output power of the system is reduced, and the aim of reducing the working condition is fulfilled.
The exhaust gas treatment assembly further includes a gas-water separator 18 and a hydrogen separator 19 according to embodiments of the present disclosure.
According to an embodiment of the present disclosure, the gas-water separator 18 is configured to be connected between the second evaporator 9 and the carbon dioxide separator 17, the gas-water separator 18 being adapted to dehydrate the exhaust gas generated by the anode. The gas inlet end of the hydrogen separator 19 is configured to be connected to the carbon dioxide separator 17, the gas outlet end of the hydrogen separator 19 is configured to be connected between the reformer 10 and the fuel gas heat exchanger 16, and the hydrogen separator 19 is adapted to separate hydrogen from the dehydrated tail gas. A seventh valve 27 is provided between the hydrogen separator 19 and the gas supply side of the fuel gas heat exchanger 16.
According to the embodiment of the present disclosure, the gas-water separator 18 adopts a cyclone gas-water separator, and the dehydrated water is transferred to the water storage tank 7 to recycle the water generated in the reduction reaction of the fuel gas of the anode of the solid oxide fuel cell stack 1.
In the embodiment, the water in the power generation system of the methanol solid oxide fuel cell can be recycled, so that water resources are saved, and the cost is reduced.
According to embodiments of the present disclosure, the hydrogen separator 19 uses membrane separation techniques, with the separation membranes employing high molecular polymer membranes, such as polyimide and polysulfone.
According to the embodiment of the present disclosure, the hydrogen in the hydrogen separator 19 can be fully recycled, so that the pumping flow of the methanol needs to be reasonably planned according to the fuel utilization rate of the solid oxide fuel cell stack 1, the system load condition data, and the like.
In the embodiment, unreacted hydrogen in the tail gas generated by the anode can enter the anode of the solid oxide fuel cell stack 1 through the fuel gas heat exchanger 16 again to participate in the reduction reaction, and then the tail gas is discharged into the atmosphere, so that the fuel utilization rate of the system is improved, and the fuel cost is reduced.
Fig. 2 is a block diagram of a methanol solid oxide fuel cell power generation system in accordance with another exemplary embodiment of the present disclosure.
According to an embodiment of the present disclosure, the heating portion includes an electric heater 28.
According to an embodiment of the present disclosure, as shown in fig. 2, the electric heater 28 is configured to be connected between the blower 3 and the air intake end of the cathode of the solid oxide fuel cell stack 1.
According to an embodiment of the present disclosure, the heating part further includes a battery pack 29.
According to an embodiment of the present disclosure, as shown in fig. 2, an input of the battery pack 29 is configured to be connected with the solid oxide fuel cell stack 1, and an output of the battery pack 29 is configured to be connected with the electric heater 28. The battery pack 29 is adapted to provide an electrical power output for the electric heater 28, while the solid oxide fuel cell stack 1 can charge the battery pack 29 when the battery pack 29 is short of power.
In such an embodiment, the power output of the solid oxide fuel cell stack 1 can be adjusted during the charging and discharging process of the battery pack 29, and the surplus power is consumed and stored for providing power to the electric heater 28 under the condition of ensuring the power demand, so that the flexibility, the power generation efficiency and the stability of the system are improved.
According to the embodiment of the present disclosure, an eighth valve 30 is provided between the blower 3 and the electric heater 28, a ninth valve 31 is provided between the blower 3 and the first air preheater 14, a tenth valve 32 is provided between the air outlet end of the anode of the solid oxide fuel cell stack 1 and the air supply side of the fuel gas heat exchanger 16, an eleventh valve 33 is provided between the second air preheater 15 and the air inlet end of the cathode of the solid oxide fuel cell stack 1, and a twelfth valve 34 is provided between the air outlet end of the cathode of the solid oxide fuel cell stack 1 and the air supply side of the fuel gas heat exchanger 16.
According to the embodiment of the disclosure, before the power generation system of the methanol solid oxide fuel cell is started, air output by the fan 3 enters the electric heater 28 through the eighth valve 30, is heated by the electric heater 28 and enters the air inlet end of the cathode of the solid oxide fuel cell stack 1, the ninth valve 31 is opened, high-temperature air heats the solid oxide fuel cell stack 1 and flows out of the air outlet end of the cathode to be split into two paths, one path is conveyed to the first air preheater 14 and the second air preheater 15 so as to exchange heat with air in the air supply sides of the first air preheater 14 and the second air preheater 15, and the other path is conveyed to the air supply side of the fuel gas heat exchanger 16 through the twelfth valve 34 so as to exchange heat between the high-temperature air and the air in the air supply side of the fuel gas heat exchanger 16. At the same time, the high temperature air flows to the reformer 10, the first evaporator 6 and the second evaporator 9, and the reformer 10, the first evaporator 6 and the second evaporator 9 are preheated to the operating temperature. After each device is heated to a normal operating condition, the electric heater 28 may be turned off.
According to the embodiment of the present disclosure, after the power generation system of the methanol solid oxide fuel cell is started, the air heated in two stages by the first air preheater 14 and the second air preheater 15 and the air heated by the electric heater 28 are mixed at the eleventh valve 33, and the mixed air enters the air inlet end of the cathode of the solid oxide fuel cell stack 1 to perform an electrochemical reaction.
According to the embodiment of the present disclosure, the exhaust gas flowing out of the cathode of the solid oxide fuel cell stack 1 is delivered to the first air preheater 14 and the second air preheater 15 so as to exchange heat with the air in the air supply side of the first air preheater 14 and the second air preheater 15, to provide necessary heat input for temperature rise of the air, and then the exhaust gas is discharged into the atmosphere. The exhaust gas flowing out of the anode of the solid oxide fuel cell stack 1 is sent to the fuel gas heat exchanger 16, and exchanges heat with the fuel gas in the gas supply side of the fuel gas heat exchanger 16. At the same time, the tail gas also flows into the reformer 10, the first evaporator 6 and the second evaporator 9, and the tail gas is used as heat supply to heat the reformer 10, the first evaporator 6 and the second evaporator 9, so that the temperature balance and stable operation of all devices are ensured.
According to the embodiment of the disclosure, during the load changing process, if additional heat input is required to meet the stable operation temperature of each device of the system, the electric heater 28 and the eighth valve 30 are required to be opened, the temperature condition of the solid oxide fuel cell stack 1 is ensured by inputting additional high-temperature air, if the temperature of the exhaust gas flowing out of the anode of the solid oxide fuel cell stack 1 is insufficient to heat the heat exchanger 16, the reformer 10, the first evaporator 6 and the second evaporator 9 under the required condition, the twelfth valve 34 can be opened, and the high-temperature air and the exhaust gas flowing out of the anode are mixed to heat the heat exchanger 16, the reformer 10, the first evaporator 6 and the second evaporator 9 together.
It should be further noted that, the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the drawings, and are not intended to limit the scope of the present disclosure. Like elements are denoted by like or similar reference numerals throughout the drawings. In the event that an understanding of the present disclosure may be made, conventional structures or constructions will be omitted, and the shapes and dimensions of the various parts in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure.
Unless otherwise known, numerical parameters in this specification and the appended claims are approximations that may vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". In general, the meaning of expression is meant to include a variation of + -10% in some embodiments, a variation of + -5% in some embodiments, a variation of + -1% in some embodiments, and a variation of + -0.5% in some embodiments by a particular amount.
The use of ordinal numbers such as "first," "second," "third," etc., in the description and the claims to modify a corresponding element does not by itself connote any ordinal number of elements or the order of manufacturing or use of the ordinal numbers in a particular claim, merely for enabling an element having a particular name to be clearly distinguished from another element having the same name.
Furthermore, unless specifically described or steps must occur in sequence, the order of the above steps is not limited to the list above and may be changed or rearranged according to the desired design. In addition, the above embodiments may be mixed with each other or other embodiments based on design and reliability, i.e. the technical features of the different embodiments may be freely combined to form more embodiments.
While the foregoing is directed to embodiments of the present disclosure, other and further details of the invention may be had by the present application, it is to be understood that the foregoing description is merely exemplary of the present disclosure and that no limitations are intended to the scope of the disclosure, except insofar as modifications, equivalents, improvements or modifications may be made without departing from the spirit and principles of the present disclosure.
Claims (10)
1. A methanol solid oxide fuel cell power generation system comprising:
a power generation assembly having an operating condition in which an electrochemical reaction is performed by a gaseous oxidant and a fuel gas to output electric energy;
a heat makeup assembly configured to heat the oxidant and the fuel gas to a reaction temperature at which the electrochemical reaction occurs to bring the power generation assembly to the operating condition;
an exhaust treatment assembly configured to separate products in the exhaust of the power generation assembly and to deliver a portion of the products into the power generation assembly to regulate the operating conditions.
2. The power generation system of claim 1, the power generation assembly comprising:
a solid oxide fuel cell stack;
an air supply mechanism configured to be connected to an air inlet end of a cathode of the solid oxide fuel cell stack, adapted to supply the oxidant to the solid oxide fuel cell stack;
a fuel gas supply mechanism configured to be connected to an intake end of an anode of the solid oxide fuel cell stack, adapted to supply the fuel gas to the solid oxide fuel cell stack;
wherein the solid oxide fuel cell stack serves as a means for performing an electrochemical reaction between the oxidant and the fuel gas, and outputs electric power.
3. The power generation system of claim 2, the air supply mechanism comprising:
an air source configured to communicate with an air inlet end of a cathode of the solid oxide fuel cell stack, adapted to supply air for use as the oxidant to the solid oxide fuel cell stack.
4. A power generation system according to claim 3, the fuel gas supply mechanism comprising:
a first methanol supply mechanism configured to supply methanol gas;
a water supply mechanism configured to supply water vapor;
a reformer, an air inlet end of which is configured to be connected with the first methanol supply mechanism and the water supply mechanism, and an air outlet end of which is configured to be connected with an air inlet end of an anode of the solid oxide fuel cell stack, adapted to cause the methanol gas and the water vapor to undergo a catalytic reforming reaction to supply the fuel gas to the solid oxide fuel cell stack.
5. The power generation system of claim 4, the heat replenishment assembly comprising:
a heating section serving as a heat source;
and a heat exchange portion configured to communicate with the heating portion and adapted to exchange heat between the heat exchange medium heated by the heating portion and the oxidizing agent and/or the fuel gas so that the oxidizing agent and/or the fuel gas is heated to the reaction temperature.
6. The power generation system of claim 5, the heating portion comprising a burner or an electric heater.
7. The power generation system of claim 5, the heat exchange portion comprising at least one air preheater;
the air supply side of the air preheater is arranged between the air source and the solid oxide fuel cell stack so as to be communicated with the air inlet end of the cathode of the solid oxide fuel cell stack, and the medium side of the air preheater is configured to be communicated with the air outlet end of the cathode of the solid oxide fuel cell stack and/or the heating part so as to exchange heat with the air in the air supply side through tail gas generated by the solid oxide fuel cell stack or a heat exchange medium generated by the heating part.
8. The power generation system of claim 7, comprising a plurality of the air preheaters disposed in sequence between the air source and the solid oxide fuel cell stack configured to stage heat the air.
9. The power generation system of claim 5, the heat exchange portion comprising at least one fuel gas heat exchanger;
the gas supply side of the fuel gas heat exchanger is arranged between the reformer and the solid oxide fuel cell stack so as to be communicated with the gas inlet end of the anode of the solid oxide fuel cell stack, and the medium side of the fuel gas heat exchanger is configured to be communicated with the gas outlet end of the anode of the solid oxide fuel cell stack and/or the heating part so as to exchange heat with the fuel gas in the gas supply side through tail gas generated by the solid oxide fuel cell stack or a heat exchange medium generated by the heating part.
10. The power generation system of claim 5, the exhaust treatment assembly comprising:
a carbon dioxide separator adapted to separate at least a portion of the carbon dioxide in the tail gas of the solid oxide fuel cell stack and adjustably deliver the carbon dioxide to the reformer to increase the hydrogen content in the fuel gas.
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| CN202310486297.6A CN116864756A (en) | 2023-04-28 | 2023-04-28 | Methanol solid oxide fuel cell power generation system |
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