CN116314976A - Indirect internal reforming solid oxide fuel cell connector - Google Patents

Indirect internal reforming solid oxide fuel cell connector Download PDF

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Publication number
CN116314976A
CN116314976A CN202310392359.7A CN202310392359A CN116314976A CN 116314976 A CN116314976 A CN 116314976A CN 202310392359 A CN202310392359 A CN 202310392359A CN 116314976 A CN116314976 A CN 116314976A
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CN
China
Prior art keywords
plate
reforming
hydrocarbon fuel
flow
gas
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CN202310392359.7A
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Chinese (zh)
Inventor
文魁
刘敏
刘太楷
宋琛
董东东
毛杰
邓春明
邓畅光
周克崧
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Institute of New Materials of Guangdong Academy of Sciences
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Institute of New Materials of Guangdong Academy of Sciences
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Priority to CN202310392359.7A priority Critical patent/CN116314976A/en
Publication of CN116314976A publication Critical patent/CN116314976A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
    • H01M8/0606—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
    • 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
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
    • 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
    • H01M8/02—Details
    • H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
    • 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 invention discloses an indirect internal reforming solid oxide fuel cell connector, and belongs to the technical field of fuel cells. The connecting body comprises an anode plate, a reforming plate and a cathode plate which are sequentially connected, and the three plates are integrally formed. The reforming plate is provided with a porous area for hydrocarbon fuel to flow and for reforming reaction to occur; the gradient of porosity of the porous region decreases in the direction of hydrocarbon fuel flow; the cathode plate, the anode plate and the reforming plate are respectively provided with through holes for the circulation of at least one material of hydrocarbon fuel, reformed synthesis gas and oxidized gas, and the through holes for the circulation of hydrocarbon fuel are communicated with the porous area; one side of the anode plate and the cathode plate, which is far away from the reforming plate, is respectively provided with a first flow channel for the flow of reforming synthesis gas and a second flow channel for the flow of oxygen-supplying gas. The connector can avoid the damage of the cell structure and the deterioration of the cell performance caused by the overlarge local thermal stress due to direct internal reforming.

Description

Indirect internal reforming solid oxide fuel cell connector
Technical Field
The invention relates to the technical field of fuel cells, in particular to an indirect internal reforming solid oxide fuel cell connector.
Background
The solid oxide fuel cell (Solid Oxide Fuel Cells, OFC) is an all-solid reaction device for directly converting chemical energy of fuel into electric energy, has the advantage of flexible fuel use, and can use hydrogen, methane, synthesis gas, ethanol and other hydrocarbon fuels. The energy conversion efficiency can reach more than 85% without being limited by the Carnot cycle, and the power density, the specific power and the specific energy are all higher than those of other types of power generation systems. Therefore, the device can be used as a mobile power supply of traffic vehicles, ships and the like, small-sized family cogeneration, medium-sized distributed power generation and large-sized centralized power stations, and is widely used in various fields of traffic, electric power, cogeneration, space aerospace and the like.
The connector is one of key core components of the SOFC stack, and the performance quality of the connector directly influences the attenuation and the stability of the stack system. In addition to electrically connecting the cells in series, the connector also separates the fuel from the oxidizing gas and provides mechanical support for the cells. In a severe high-temperature strong oxidation and reduction service environment, the thermal expansion coefficient of the connector is matched with other parts of the battery; and it is required to have: the high electronic conductivity and low ionic conductivity, composition and microstructure have strong oxidation-reduction resistance, good air tightness and high mechanical strength, and do not react or interdiffuse with electrode materials.
When hydrocarbon is used as fuel for SOFC, it is generally necessary to useReforming the fuel to obtain CO and H 2 The synthesis gas of the mixture enters the porous electrode to generate electrochemical reaction. From the reforming site, fuel reforming can be classified into external reforming and internal reforming. External reforming is to first produce synthesis gas from hydrocarbon fuel and then to feed the SOFC stack. This reforming increases the volume and complexity of the system and increases the cost. Internal reforming is to add a proper amount of steam into hydrocarbon fuel, and the internal reforming of the fuel is realized by using the high-temperature working environment of SOFC. While the complexity and cost of the external reforming apparatus can be reduced, the internal reforming of the fuel that occurs inside the cell is a very fast, strong endothermic chemical reaction that requires the absorption of a large amount of heat, creating a large temperature gradient inside the cell, and the resulting thermal stresses can easily cause structural failure of the cell and result in reduced performance. When hydrocarbon is selected as fuel, the hydrocarbon is easily cracked by reforming in the high-temperature anode to form carbon deposit which covers the surface of the active site of the anode, and the performance of the battery is greatly reduced. In addition, when the electric pile is preheated and started directly by heating fuel and oxidizing gas or cooled at too high temperature by increasing the flow rate of the oxidizing gas, the methods are to make the air flow medium directly contact with the functional layers of the battery electrode, which increases the temperature gradient of local areas in the battery, causes interface separation of heterogeneous components in the battery, and causes structural damage of the battery.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide an indirect internal reforming solid oxide fuel cell connector, which can avoid the damage of a cell structure and the deterioration of cell performance caused by excessive local thermal stress due to direct internal reforming.
The application can be realized as follows:
the application provides an indirect internal reforming solid oxide fuel cell connector, which comprises an anode plate and a cathode plate, wherein the anode plate is used for being connected with an anode, the cathode plate is used for being connected with a cathode, the reforming plate is positioned between the anode plate and the cathode plate, and the anode plate, the reforming plate and the cathode plate are sequentially connected and integrally formed;
the reforming plate is provided with a porous area for hydrocarbon fuel to flow and for reforming reaction to occur; the gradient of porosity of the porous region decreases in the direction of hydrocarbon fuel flow;
the cathode plate, the anode plate and the reforming plate are respectively provided with through holes for the circulation of at least one material of hydrocarbon fuel, reformed synthesis gas and oxidized gas, wherein the through holes for the circulation of hydrocarbon fuel are communicated with the porous area;
a first flow passage for the flow of the reformed synthesis gas is arranged on one side of the anode plate, which is far away from the reforming plate, and the first flow passage is connected with a through hole for the flow of the corresponding reformed synthesis gas; and one side of the cathode plate, which is far away from the reforming plate, is correspondingly provided with a second flow passage for flowing the oxygen-supplying gas, and the second flow passage is connected with a through hole for flowing corresponding oxidizing gas.
In an alternative embodiment, the porosity is 50-90%.
In an alternative embodiment, the pore size of each pore in the porous region is 50-1000 μm.
In an alternative embodiment, the porous region includes at least two sub-porous regions in a direction perpendicular to the flow of hydrocarbon fuel, with adjacent two sub-porous regions separated by a solid rib.
In an alternative embodiment, the porous region has a region of polyhedral lattice unit structure.
In an alternative embodiment, all surfaces involved in the porous region are provided with a catalyst for reforming reactions of hydrocarbon fuel.
In an alternative embodiment, a first groove is formed in the surface of one side, far away from the reforming plate, of the anode plate, a first flow channel is arranged in the first groove, and the extending direction of the first flow channel is the flowing direction of the reformed synthetic gas material;
the surface of one side of the cathode plate, which is far away from the reforming plate, is provided with a second groove, a second flow passage is arranged in the second groove, and the extending direction of the second flow passage is the flowing direction of the oxidizing gas material.
In an alternative embodiment, the indirect internal reforming solid oxide fuel cell connector further comprises a gas distribution portion for communicating the gaseous feed with the respective flow channels.
In an alternative embodiment, the through holes comprise reformed syngas through holes for flow-through of reformed syngas and oxidation gas through holes for flow-through of oxygen-supplied gas;
the reformed synthesis gas through hole comprises a reformed synthesis gas inlet and a reformed synthesis gas outlet, and the oxidation gas through hole comprises an oxidation gas inlet and an oxidation gas outlet;
one end of the first runner is connected with the reformed synthesis gas inlet through the gas distribution part, and the other end of the first runner is connected with the reformed synthesis gas outlet; one end of the second runner is correspondingly connected with the oxidizing gas inlet through the gas distribution part, and the other end is connected with the oxidizing gas outlet.
In an alternative embodiment, the through holes further comprise hydrocarbon fuel through holes for circulating hydrocarbon fuel, the hydrocarbon fuel through holes comprise hydrocarbon fuel inlets and hydrocarbon fuel outlets which are oppositely arranged, and the number of the hydrocarbon fuel inlets and the number of the hydrocarbon fuel outlets are equal; the hydrocarbon fuel inlet and the hydrocarbon fuel outlet are both in communication with the porous region.
The beneficial effects of this application include:
the reforming plate is arranged between the anode plate and the cathode plate, and is provided with a porous area for hydrocarbon fuel to flow and reforming reaction to occur; the porosity gradient of the porous region decreases in the direction of hydrocarbon fuel flow.
The fuel is reformed by adopting the internal reforming mode in the mode, so that the defects of large system volume, complex system, high cost and the like caused by the external reforming mode are avoided. In addition, the solid oxide fuel cell connector provided by the application is beneficial to avoiding the generation of larger temperature gradient in the cell caused by the reforming process by setting the porosity of the porous region as a gradient reduction mode, reducing the formed thermal stress and avoiding the damage to the cell structure. In addition, the solid oxide fuel cell connector not only can avoid the phenomenon that carbon deposition formed by hydrocarbon fuel covers the surface of an anode active site to greatly reduce the cell performance, but also can avoid the phenomenon that a heterogeneous interface in the cell is separated to damage the structure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of the structure of an anode plate in an indirect internal reforming solid oxide fuel cell connector provided herein;
FIG. 2 is a schematic view of the structure of a reforming plate in an indirect internal reforming solid oxide fuel cell connector provided herein;
FIG. 3 is an enlarged view of the porous region of FIG. 2;
fig. 4 is a schematic structural view of a cathode plate in an indirect internal reforming solid oxide fuel cell connector provided herein.
Icon: 10-anode plate; 11-a first groove; 12-a first flow channel; 20-reforming plates; 30-a cathode plate; 31-porous region; a 32-sub-porous region; 35-solid ribs; 36-polyhedral lattice unit structure; 411-reformed syngas inlet; 412-a reformed synthesis gas outlet; 421-oxidant gas inlet; 422-oxidizing gas outlet; 431-hydrocarbon fuel inlet; 432-hydrocarbon fuel outlet; 50-an air distribution part; 51-a first side; 52-a second side; 53-a third side; 54-fourth side.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Examples
Referring to fig. 1 to 4, the present application proposes an indirect internal reforming solid oxide fuel cell connector comprising an anode plate 10 for connection to an anode and a cathode plate 30 for connection to a cathode, which are disposed opposite to each other, and a reforming plate 20 disposed between the anode plate 10 and the cathode plate 30.
The anode plate 10, the reforming plate 20, and the cathode plate 30 are sequentially connected and integrally formed to form a self-sealing dense region (also understood as a solid region).
For reference, the anode plate 10, the reforming plate 20 and the cathode plate 30 are maintained in a uniform size and shape, and may be set according to actual needs. More specifically, the positions and sizes of the through holes provided in the anode plate 10, the reforming plate 20, and the cathode plate 30, respectively, are maintained to be uniform.
The cathode plate 30, the anode plate 10 and the reforming plate 20 are respectively provided with through holes for passing at least one of hydrocarbon fuel, reformed synthesis gas and oxidizing gas. That is, according to actual needs, only a through hole for flowing hydrocarbon fuel (simply referred to as "hydrocarbon fuel through hole") or a through hole for flowing reformed synthesis gas (simply referred to as "reformed synthesis gas through hole") or a through hole for flowing oxygen-supplied gas (simply referred to as "oxygen gas through hole") may be provided; the through holes for the hydrocarbon fuel and the reformed synthesis gas may be provided simultaneously, or the through holes for the hydrocarbon fuel and the oxygen supply gas may be provided simultaneously, or the through holes for the reformed synthesis gas and the oxygen supply gas may be provided simultaneously, or the through holes for the hydrocarbon fuel, the reformed synthesis gas and the oxygen supply gas may be provided simultaneously.
Specifically, the reformed synthesis gas through-hole includes a reformed synthesis gas inlet 411 and a reformed synthesis gas outlet 412, the oxidizing gas through-hole includes an oxidizing gas inlet 421 and an oxidizing gas outlet 422, the hydrocarbon fuel through-hole includes a hydrocarbon fuel inlet 431 and a hydrocarbon fuel outlet 432 which are disposed opposite to each other, and both the hydrocarbon fuel inlet 431 and the hydrocarbon fuel outlet 432 are in communication with the porous region 31.
Further, a first flow channel 12 for flowing the reformed synthesis gas is provided on the side of the anode plate 10 away from the reforming plate 20, and the first flow channel 12 is connected to a through hole for flowing the corresponding gas material. The cathode plate 30 is provided with a second flow passage (not shown) for the flow of the oxygen-supplying gas at a side away from the reforming plate 20, and the second flow passage is connected to the through hole for the flow of the corresponding gas material.
Specifically, a side surface (upper surface) of the anode plate 10 remote from the reforming plate 20 is provided with a first recess 11 downward, the upper surface of the anode plate 10 is for connection with an external anode, and the lower surface of the anode plate 10 is for connection with the reforming plate 20. The first flow channel 12 is disposed in the first groove 11, and the extending direction of the first flow channel 12 is the flowing direction of the gas material (reformed synthesis gas).
Similarly, a side surface (lower surface) of the cathode plate 30 remote from the reforming plate 20 is provided with an upward second groove (not shown), the lower surface of the cathode plate 30 is for connection with an external cathode, and the upper surface of the cathode plate 30 is for connection with the reforming plate 20. The second flow channel is arranged in the second groove, and the extending direction of the second flow channel is the flowing direction of the gas material (oxidizing gas).
One specific embodiment is listed below:
taking the anode plate 10, the reforming plate 20 and the cathode plate 30 as four sides (such as rectangle) as examples, the three plates respectively correspond to a first side 51, a second side 52, a third side 53 and a fourth side 54 which are connected end to end in sequence, wherein the first side 51 and the third side 53 are oppositely arranged, and the second side 52 and the fourth side 54 are oppositely arranged.
The reformed synthesis gas inlet 411 is provided at least at a position of the anode plate 10 close to the first side 51 and penetrates the upper and lower surfaces of the plate, and the reformed synthesis gas outlet 412 is provided at least at a position of the anode plate 10 close to the third side 53 and penetrates the upper and lower surfaces of the plate.
The oxidizing gas inlets 421 are disposed at least at a position of the cathode plate 30 near the third side surface 53 and penetrate the upper and lower surfaces of the plate, and the oxidizing gas outlets 422 are disposed at least at a position of the cathode plate 30 near the first side surface 51 and penetrate the upper and lower surfaces of the plate.
The hydrocarbon fuel inlet 431 is disposed at least at a location of the reforming plate 20 adjacent to the second side 52 and extends through the upper and lower surfaces of the plate, and the hydrocarbon fuel outlet 432 is disposed at least at a location of the reforming plate 20 adjacent to the fourth side 54 and extends through the upper and lower surfaces of the plate.
In some embodiments, the respective positions of each plate (anode plate 10, reforming plate 20, and cathode plate 30) are provided with a reformed syngas inlet 411, a reformed syngas outlet 412, an oxidizing gas inlet 421, an oxidizing gas outlet 422, a hydrocarbon fuel inlet 431, and a hydrocarbon fuel outlet 432.
Illustratively, the number of reformed syngas inlets 411 and oxidant inlets 421 may each be 2, and the number of reformed syngas outlets 412 and oxidant outlets 422 may each be 1. The positional relationship of the 2 reformed syngas inlets 411 provided to the anode plate 10 near the first side 51 area and the 1 reformed syngas outlets 412 provided to the anode plate 10 near the third side 53 area may be: the projection of the reformed synthesis gas outlet 412 onto the first side 51 of the anode plate 10 is located in the middle of the 2 reformed synthesis gas inlets 411. Similarly, the positional relationship of the 2 oxidizing gas inlets 421 provided to the region of the cathode plate 30 near the third side surface 53 and the 1 oxidizing gas outlets 422 provided to the region of the cathode plate 30 near the first side surface 51 may be: the projection of the oxidant gas outlet 422 onto the third side 53 of the cathode plate 30 is located in the middle of the 2 oxidant gas inlets 421.
In other embodiments, the number and positional relationship of the through holes may be appropriately adjusted as needed, and are not limited thereto.
In this application, the indirect internal reforming solid oxide fuel cell connector further includes a gas distribution portion 50 for communicating the gaseous material with the corresponding flow channels.
For reference, one end of the first flow channel 12 may be connected to an inlet of a gas material (specifically, a reformed synthesis gas inlet 411 provided to the anode plate 10) through the gas distribution portion 50, and the other end is connected to a corresponding outlet of the gas material (specifically, a reformed synthesis gas outlet 412 provided to the anode plate 10); similarly, one end of the second runner may be connected to an inlet of the gas material (specifically, the oxidizing gas inlet 421 of the cathode plate 30) through the gas distribution portion 50, and the other end is connected to a corresponding outlet of the gas material (specifically, the oxidizing gas outlet 422 of the cathode plate 30). The gas distribution part 50 may be provided with a plurality of gas distribution strips so that gas distribution is more uniform.
The reforming plate 20 is provided with a porous region 31 for hydrocarbon fuel to flow and reforming reactions to occur. In some alternative embodiments, the middle region of the reforming plate 20 is provided with the porous region 31.
The through holes for circulating hydrocarbon fuel communicate with the above-mentioned porous region 31. That is, the hydrocarbon fuel through holes provided in the second side 52 and the fourth side 54 of the reforming plate 20 are each in communication with the porous region 31.
In this application, the porosity gradient of the porous region 31 decreases in the direction of hydrocarbon fuel flow.
The internal reforming of fuel occurring inside the battery is a strong endothermic chemical reaction with very fast rate, and needs to absorb a large amount of heat. In addition, the mode can not only avoid the phenomenon that carbon deposition formed by hydrocarbon fuel covers the surface of an anode active site to greatly reduce the performance of the battery, but also avoid the phenomenon that a separation and other damage structures are generated at a heterogeneous interface inside the battery.
Preferably, the porosity of the porous region 31 is reduced in a gradient in the range of 50% -90% (the minimum porosity and the maximum porosity are changed in a gradient between 50% and 90%), for example, the gradient may be set to 1%, 2%, 5%, 10%, 15%, 20%, 25% or 30%, etc.
It should be noted that, if the porosity of the porous region 31 is lower than 50%, a larger pressure drop of flowing hydrocarbon fuel is easily generated in the porous region, so as to increase the energy loss of the fuel pump; above 90%, the area of the area where the reforming reaction takes place is reduced, resulting in insufficient reforming reaction of hydrocarbon fuel.
For reference, the pore diameter of each pore in the porous region 31 may be 50 to 1000 μm, such as 50 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm or 1000 μm, or the like, or may be any other value in the range of 50 to 1000 μm.
If the pore diameter of each pore in the porous region 31 is smaller than 50 μm, the fuel gas flow resistance is increased, which is not advantageous in reducing the pressure loss; if the thickness is more than 1000 μm, the area of the reforming reaction region is reduced, the mechanical strength of the porous region is lowered, and the thickness of the connecting body is increased.
In some embodiments, the number of porous regions 31 may be only 1. In other embodiments, the porous region 31 includes at least two sub-porous regions 32 in a direction perpendicular to the flow of hydrocarbon fuel. For example, the porous region 31 may be collectively formed from 2, 3, 4, 5, or more sub-porous regions 32.
Accordingly, the number of hydrocarbon fuel inlets 431 and hydrocarbon fuel outlets 432 in the hydrocarbon fuel through hole is equal to the number of sub-porous regions 32, that is, each sub-porous region 32 corresponds to 1 hydrocarbon fuel inlet 431 and 1 hydrocarbon fuel outlet 432, respectively. For example, each of the sub-porous regions 32 communicates at both ends with a hydrocarbon fuel inlet 431 near the second side 52 of the reforming plate 20 and a hydrocarbon fuel outlet 432 near the fourth side 54 of the reforming plate 20, respectively.
When the porous region 31 includes at least two sub-porous regions 32, adjacent two sub-porous regions 32 are separated by a solid rib 35. The porous region 31 is a region having a polyhedral lattice unit structure 36, and the polyhedron may be, for example, a hexahedron or an octahedron.
Further, all the surfaces involved in the above porous region 31 are provided with a catalyst for reforming reaction of hydrocarbon fuel. All of the above surfaces include the surface of the porous frame structure and all of the surfaces surrounding the porous region 31.
For reference, the catalyst may be generated in situ by the design of the linker material, or may be supported to the surface of the porous region 31 by impregnation or the like.
The catalyst may be a material having high catalytic activity and may include, by way of example and not limitation, al 2 O 3 、NiO、CeO 2 And La (La) 2 O 3 At least one of them.
The specific manner of loading the catalyst in the present application is not limited as long as it can be loaded on all the surfaces involved in the porous region 31.
In summary, the solid oxide fuel cell connector provided by the application reforms fuel in an internal reforming mode, so that the defects of large system volume, complex system, high cost and the like caused by an external reforming mode are avoided. In addition, the solid oxide fuel cell connector is beneficial to avoiding the generation of larger temperature gradient in the cell in the reforming process, reducing the formed thermal stress and avoiding the damage to the cell structure. In addition, the solid oxide fuel cell connector not only can avoid the phenomenon that carbon deposition formed by hydrocarbon fuel covers the surface of an anode active site to greatly reduce the cell performance, but also can avoid the phenomenon that a heterogeneous interface in the cell is separated to damage the structure.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. An indirect internal reforming solid oxide fuel cell connector comprising an anode plate for connection to an anode and a cathode plate for connection to a cathode disposed opposite each other, and a reforming plate between the anode plate and the cathode plate; the anode plate, the reforming plate and the cathode plate are sequentially connected and integrally formed;
the reforming plate is provided with a porous area for hydrocarbon fuel to flow and for reforming reaction to occur; the porosity gradient of the porous region decreases in the direction of hydrocarbon fuel flow;
the cathode plate, the anode plate and the reforming plate are respectively provided with through holes for the circulation of at least one material of hydrocarbon fuel, reformed synthesis gas and oxidizing gas, wherein the through holes for the circulation of hydrocarbon fuel are communicated with the porous area;
a first runner for circulating reforming synthesis gas is arranged on one side of the anode plate, which is far away from the reforming plate, and the first runner is connected with a through hole for circulating corresponding gas materials; and one side of the cathode plate, which is far away from the reforming plate, is correspondingly provided with a second flow passage for the circulation of the oxygen-supplying gas, and the second flow passage is connected with a through hole for the circulation of corresponding gas materials.
2. The indirect internal reforming solid oxide fuel cell connector of claim 1, wherein the porosity is 50-90%.
3. The indirect internal reforming solid oxide fuel cell connector of claim 2, wherein the pore size of each pore in the porous region is 50-1000 μm.
4. An indirect internal reforming solid oxide fuel cell connector according to any one of claims 1 to 3, wherein the porous region comprises at least two sub-porous regions separated by a solid rib between adjacent two of the sub-porous regions in a direction perpendicular to the flow of hydrocarbon fuel.
5. An indirect internal reforming solid oxide fuel cell connector according to any one of claims 1 to 3, wherein the porous region is a region having a polyhedral lattice unit structure.
6. An indirect internal reforming solid oxide fuel cell connector according to any one of claims 1 to 3, wherein all surfaces involved in the porous region are provided with a catalyst for reforming reactions of hydrocarbon fuel.
7. The indirect internal reforming solid oxide fuel cell connector of claim 1, wherein a side surface of the anode plate remote from the reforming plate is provided with a first groove, the first flow channel is arranged in the first groove, and the extending direction of the first flow channel is the flow direction of reformed synthesis gas material;
the surface of one side of the cathode plate, which is far away from the reforming plate, is provided with a second groove, the second flow passage is arranged in the second groove, and the extending direction of the second flow passage is the flowing direction of the oxidizing gas material.
8. The indirect internal reforming solid oxide fuel cell connector of claim 1, further comprising a gas distribution portion for communicating the gaseous material with the respective flow channels.
9. The indirect internal reforming solid oxide fuel cell connector of claim 8, wherein the through-holes comprise a reformed syngas through-hole for flow-through of reformed syngas and an oxidizing gas through-hole for flow-through of oxygenated gas;
the reformed synthesis gas through hole comprises a reformed synthesis gas inlet and a reformed synthesis gas outlet, and the oxidation gas through hole comprises an oxidation gas inlet and an oxidation gas outlet;
one end of the first runner is connected with the reformed synthesis gas inlet through a gas distribution part, and the other end of the first runner is connected with the reformed synthesis gas outlet; one end of the second flow channel is correspondingly connected with the oxidizing gas inlet through the gas distribution part, and the other end of the second flow channel is connected with the oxidizing gas outlet.
10. The indirect internal reforming solid oxide fuel cell connector of claim 9, wherein the through-hole further comprises a hydrocarbon fuel through-hole for the circulation of hydrocarbon fuel, the hydrocarbon fuel through-hole comprises a hydrocarbon fuel inlet and a hydrocarbon fuel outlet which are oppositely arranged, and the number of the hydrocarbon fuel inlets and the number of the hydrocarbon fuel outlets are equal; the hydrocarbon fuel inlet and the hydrocarbon fuel outlet are both in communication with the porous region.
CN202310392359.7A 2023-04-12 2023-04-12 Indirect internal reforming solid oxide fuel cell connector Pending CN116314976A (en)

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