CN113629267A - Direct carbon solid oxide fuel cell structure with waste gas recirculation - Google Patents

Direct carbon solid oxide fuel cell structure with waste gas recirculation Download PDF

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CN113629267A
CN113629267A CN202110800713.6A CN202110800713A CN113629267A CN 113629267 A CN113629267 A CN 113629267A CN 202110800713 A CN202110800713 A CN 202110800713A CN 113629267 A CN113629267 A CN 113629267A
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plate
anode
cathode
perforated plate
fuel cell
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CN113629267B (en
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王海林
童鑫
蔡位子
侯俊伟
吴伟创
郭燕宁
黄星凯
符代双
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South China Agricultural University
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South China Agricultural University
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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
    • H01M8/04—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
    • H01M8/02—Details
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
    • 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
    • H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
    • H01M8/0276—Sealing means characterised by their form
    • 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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/2484—Details of groupings of fuel cells characterised by external manifolds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Abstract

The invention discloses a direct carbon solid oxide fuel cell structure with waste gas recirculation, which comprises a heat-insulating shell and an internal electrode, wherein the heat-insulating shell is arranged on the heat-insulating shell; the internal electrode is positioned in the heat-insulation shell and comprises a battery plate, a cathode column and an anode column, the battery plate comprises an anode plate, a cathode plate and an electrolyte plate, and the anode column and the cathode column respectively penetrate out of the heat-insulation shell; be equipped with first perforated plate and second perforated plate in the lagging casing, first perforated plate is located the top of panel, the second perforated plate is located the below of panel, the panel is wavy, the lagging casing, first perforated plate and second perforated plate enclose jointly and establish positive pole chamber and negative pole chamber that the panel formed the interval and set up, first perforated plate and second perforated plate correspond positive pole chamber and negative pole chamber interval respectively and set up a plurality of through-holes, every through-hole and positive pole chamber or negative pole chamber intercommunication, be equipped with self return mechanism on first perforated plate and the second perforated plate respectively, self return mechanism is used for making one and external intercommunication in positive pole chamber and the negative pole chamber, another is sealed.

Description

Direct carbon solid oxide fuel cell structure with waste gas recirculation
Technical Field
The invention relates to the technical field of solid oxide fuel cells, in particular to a direct carbon solid oxide fuel cell structure with waste gas recycling.
Background
The Solid Oxide Fuel Cell (SOFC) belongs to the third generation fuel cell, and is an all-solid-state chemical power generation device capable of efficiently and cleanly converting chemical energy in fuel into electric energy. The fuel cell is composed of a compact electrolyte which is responsible for conducting oxygen ions and isolating two-stage reactants, and a porous anode and a porous cathode which respectively have electrocatalysis effects on fuels and oxidants, and the operating temperature range of the fuel cell is 600-1000 ℃, so that the fuel cell has the advantages of wide fuel use range, high fuel utilization rate and the like. The SOFC is divided into a tubular cell structure and a flat cell structure, the tubular SOFC is firm in structure and good in sealing performance, but the flow collecting path is long and the energy density is low; flat SOFCs are simple in design and high in energy density, but are difficult to achieve high temperature sealing. Due to the difficulty of adding solid fuel and discharging fuel waste in the flat plate structure, flat plate SOFCs are still dominated by gaseous fuels, such as hydrogen and methane. Hydrogen is the most common fuel used by SOFC, but hydrogen is a secondary energy source, cannot be directly obtained from nature, and has the problems of high preparation cost, low volume energy density, poor storage and transportation safety and the like. Hydrocarbon fuels such as methane carry the risk of carbon deposits. In contrast, the solid carbon fuel does not have the above-described problems, and is considered to be a safe fuel that can replace hydrogen. Meanwhile, the solid carbon also has the advantages of high energy density, low price, wide source and the like, and has no safety problem of storage and transportation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a direct carbon solid oxide fuel cell structure with exhaust gas recirculation, and solves the problem that the carbon fuel of a flat-plate solid oxide fuel cell is difficult to fill and discharge. Meanwhile, the invention also designs a device for recycling the gas after reaction, which solves the problem of CO and CO generated by the existing direct carbon solid oxide fuel cell2Especially the direct discharge of CO into the air causes a problem of fuel waste.
The technical scheme of the invention is as follows: a direct carbon solid oxide fuel cell structure with exhaust gas recirculation comprises a heat-insulating shell and an internal electrode;
the internal electrode is positioned in the heat-insulation shell and comprises a battery plate, a cathode column and an anode column, the battery plate comprises an anode plate, a cathode plate and an electrolyte plate, the anode plate comprises a first surface and a second surface, the cathode plate comprises a third surface and a fourth surface, the electrolyte plate comprises a fifth surface and a sixth surface, the first surface is attached to the fifth surface, the third surface is attached to the sixth surface, the cathode column is connected with the cathode plate and the electrolyte plate together, the anode column is connected with the anode plate and the electrolyte plate together, and the anode column and the cathode column respectively penetrate out of the heat-insulation shell;
be equipped with first perforated plate and second perforated plate in the lagging casing, first perforated plate is located the top of panel, the second perforated plate is located the below of panel, the panel is wavy, the lagging casing, first perforated plate and second perforated plate enclose jointly and establish positive pole chamber and negative pole chamber that the panel formed the interval and set up, first perforated plate and second perforated plate correspond positive pole chamber and negative and positive negative chamber interval respectively and set up a plurality of through-holes, every through-hole and positive pole chamber or negative pole chamber intercommunication, be equipped with self return mechanism on first perforated plate and the second perforated plate respectively, self return mechanism is used for making one and external intercommunication in positive pole chamber and the negative pole chamber, another is sealed, the realization adds carbon fuel or the waste material of discharging.
Further, self return mechanism includes arm-tie and extension spring, be equipped with the movable groove on the lagging casing, the size and the arm-tie size matching in movable groove, the arm-tie can be followed the movable groove and stretched out the lagging casing, be equipped with the stopper on the arm-tie, the size of stopper is greater than the movable groove, the stopper is located the lagging casing, extension spring's one end and lagging casing's inner wall connection, the other end is connected with the stopper, the interval sets up a plurality of counterpoint holes on the arm-tie, the pulling arm-tie is up to the inner wall of stopper butt lagging casing, counterpoint hole and positive pole chamber intercommunication this moment, the arm-tie seals the negative pole chamber, the carbon fuel that can add, loosen the arm-tie, at extension spring's effort, the arm-tie return, counterpoint hole and negative pole chamber intercommunication this moment, the arm-tie seals the positive pole chamber. Through setting up the stopper for the arm-tie is when pulling out completely, and the counterpoint hole reaches the effect of adding carbon fuel and discharge waste material with the corresponding in positive pole chamber, and after the completion of packing, extension spring assists the arm-tie and resets, seals the positive pole chamber.
Furthermore, hooks are respectively arranged on the inner wall of the heat-insulating shell and the limiting block, and two ends of the extension spring are respectively connected with the hooks.
Further, the face that arm-tie and first perforated plate or second perforated plate contact bonds and has the quartz wool, through setting up the quartz wool, further guarantees sealing performance.
Furthermore, the end part of the pulling plate is provided with a handle, the handle is positioned outside the heat-insulating shell, and the size of the handle is larger than that of the movable groove.
Further, the gas circulation device comprises a gas storage box, a gas inlet manifold and a gas exhaust manifold, a main pipe of the gas inlet manifold and a main pipe of the gas exhaust manifold are connected with the gas storage box, branch pipes of the gas inlet manifold and the gas exhaust manifold penetrate through the heat preservation shell and are communicated with the anode cavity respectively, a one-way gas inlet valve is arranged on the main pipe of the gas inlet manifold, a one-way gas exhaust valve and a manual valve are arranged on the main pipe of the gas exhaust manifold, and a pressure release valve is arranged on the gas storage box.
Furthermore, the inner wall of the heat-insulating shell is provided with a bearing flange, and the first porous plate and the second porous plate are respectively arranged on the bearing flange.
Further, the anode plate, the cathode plate and the electrolyte plate are respectively connected with the heat preservation shell, the first porous plate and the second porous plate in a sealing mode through silver paste, and the cathode column and the anode column are formed by the silver paste. Silver paste is used as a sealing agent, so that the high-temperature sealing requirement is met, and the current can be collected.
Further, the tip of anode plate and negative plate is seted up partially the mistake in vertical direction and horizontal direction and is put for the tip of anode plate and the tip of negative plate are not coplane, prevent that anode plate and negative plate from leading to the fact the short circuit through silver thick liquid connection.
Further, the first porous plate and the second porous plate are both made of insulating ceramic materials.
The working method of the direct carbon solid oxide fuel cell structure with the exhaust gas recirculation comprises the following steps:
step S1: operating an automatic return mechanism on the first porous plate to enable the anode cavity to be communicated with the outside, sealing the cathode cavity at the moment, filling the solid carbon fuel into the anode cavity from the through hole, resetting the automatic return mechanism to enable the anode cavity to be sealed, and enabling the cathode cavity to be communicated with the outside to finish filling;
step S2: when the temperature reaches the working temperature, the battery structure starts to work, and CO are generated in the anode cavity2The air pressure is increased, when the air pressure value exceeds the pressure limit of the one-way air inlet valve, the one-way air inlet valve is opened, and CO are added2Gas enters the gas storage box from the anode cavity through the gas inlet manifold, the gas pressure continues to increase along with the reaction, and in order to prevent the cell structure from being damaged by overlarge gas pressure, the pressure release valve is opened to keep the internal gas pressure stable when the gas pressure value exceeds the limit value of the pressure release valve;
step S3: after the first reaction is finished, pulling open the automatic return mechanism on the second porous plate under the state that the manual valve is closed to enable the anode cavity to be communicated with the outside, sealing the cathode cavity, discharging waste materials in the anode cavity, simultaneously reducing the air pressure to be equal to the atmospheric pressure, resetting the automatic return mechanism to enable the cathode cavity to be communicated with the outside, sealing the anode cavity, and finishing discharging;
step S4: and repeating the step S1 to perform filling, opening the manual valve when the filling completes the second reaction, wherein the air pressure in the air storage box is greater than the air pressure in the anode cavity, and CO in the air storage box2Gas enters the anode cavity through the one-way exhaust valve and the exhaust manifold, and the CO concentration in the anode cavityThe rising is quickly reacted, the starting of the battery structure is accelerated, and CO2CO is generated by reaction with solid carbon, the CO concentration in the anode cavity is further increased, and when the air pressure in the anode cavity exceeds the limit pressure of the one-way air inlet valve, the CO and the CO in the anode cavity2The gas flows into the gas storage tank again to prepare for the next cycle.
Compared with the prior art, the invention has the following beneficial effects:
according to the direct carbon solid oxide fuel cell structure with the waste gas recirculation function, the cell panel is arranged in a wavy shape, the heat preservation shell, the first porous plate and the second porous plate are arranged in a surrounding mode to form the anode cavity and the cathode cavity which are arranged at intervals, and the requirement for adding fuel into the anode cavity of the solid oxide fuel cell and discharging waste materials after reaction can be met through operating the automatic return mechanism.
According to the direct carbon solid oxide fuel cell structure with the waste gas recirculation function, the gas generated by the reaction of the direct carbon solid oxide fuel cell is collected and reused by arranging the gas circulation device, so that the utilization of fuel is improved, and the starting of the direct carbon solid oxide fuel cell is accelerated.
According to the direct carbon solid oxide fuel cell structure with the exhaust gas recirculation, silver paste is used as a sealing agent and a conducting circuit of the cell plate, and an electrode pole is formed outside the shell, so that charge collection is simplified.
Drawings
Fig. 1 is a schematic view showing the construction of an exhaust gas recirculation direct carbon solid oxide fuel cell and the assembly construction of a gas circulation device according to the present invention.
Fig. 2 is a front view of the construction of an exhaust gas recirculation direct carbon solid oxide fuel cell of the present invention.
Fig. 3 is a cross-sectional view taken along line a-a of fig. 2.
Fig. 4 is a top view of the exhaust gas recirculation direct carbon solid oxide fuel cell structure of the present invention.
Fig. 5 is a cross-sectional view taken along line B-B of fig. 4.
Fig. 6 is a schematic view of the assembly of the inner electrode of the present invention with the first and second porous plates.
Fig. 7 is a schematic structural diagram of the automatic return mechanism of the present invention.
Fig. 8 is a schematic of the packing for an exhaust gas recirculation direct carbon solid oxide fuel cell configuration of the present invention.
The device comprises a heat preservation shell 1, a first porous plate 11, a second porous plate 12, a through hole 13, an anode pole 21, a cathode pole 22, an anode plate 23, a cathode plate 24, an electrolyte plate 25, an anode cavity 26, a cathode cavity 27, a pulling plate 31, a tension spring 32, a limiting block 33, an alignment hole 34, a handle 35, a gas storage box 41, an air inlet manifold 42, an exhaust manifold 43, a one-way air inlet valve 44, a one-way exhaust valve 45, a manual valve 46 and a pressure release valve 47.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Examples
As shown in fig. 1, the present embodiment provides a structure of an exhaust gas recirculation direct carbon solid oxide fuel cell, which includes a thermal insulation case 1, an internal electrode, and a gas circulation device.
As shown in fig. 2 and 3, the internal electrode is located in the thermal insulation shell, the thermal insulation shell is provided with an anode hole and a cathode hole, the internal electrode comprises a battery plate, an anode column 21 and a cathode column 22, the battery plate comprises an anode plate 23, a cathode plate 24 and an electrolyte plate 25, the anode plate comprises a first surface and a second surface, the cathode plate comprises a third surface and a fourth surface, the electrolyte plate comprises a fifth surface and a sixth surface, the first surface is attached to the fifth surface, the third surface is attached to the sixth surface, the cathode column is connected with the cathode plate and the electrolyte plate, the anode column is connected with the anode plate and the electrolyte plate, and the anode column and the cathode column penetrate out of the thermal insulation shell through the anode hole and the cathode hole respectively.
As shown in fig. 4, fig. 5 and fig. 6, be equipped with first perforated plate 11 and second perforated plate 12 in the heat preservation shell, first perforated plate and second perforated plate all adopt insulating ceramic material to make, the inner wall of heat preservation shell is equipped with bears the flange, first perforated plate and second perforated plate are placed respectively on bearing the flange, first perforated plate is located the top of panel, the second perforated plate is located the below of panel, the panel is wavy, the anode plate, cathode plate and electrolyte board are respectively through silver thick liquid and heat preservation shell, first perforated plate and second perforated plate sealing connection, cathode column and anode column are silver thick liquid and form. Silver paste is used as a sealing agent, can be used for collecting current when meeting the high-temperature sealing requirement, and is also used as a conducting circuit, and finally a cathode column and an anode column are formed at a cathode hole and an anode hole of the heat-insulating shell. The tip of anode plate and negative plate is seted up in the part mistake on vertical direction and horizontal direction and is put for the tip of anode plate and the tip of negative plate are not coplane, prevent that anode plate and negative plate from leading to the fact the short circuit through silver thick liquid connection. Heat preservation housing, first perforated plate and second perforated plate enclose jointly and establish positive pole chamber 26 and the negative pole chamber 27 that the panel formed the interval and set up, first perforated plate and second perforated plate correspond positive pole chamber and negative and positive chamber interval respectively and set up a plurality of through-holes 13, every through-hole and positive pole chamber or negative pole chamber intercommunication, be equipped with self return mechanism on first perforated plate and the second perforated plate respectively, self return mechanism is used for making one in positive pole chamber and the negative pole chamber and external intercommunication, another seals, the realization adds carbon fuel or the waste material of discharging.
As shown in fig. 7 and 8, in this embodiment, the self-return mechanism includes arm-tie 31 and extension spring 32, is equipped with the activity groove on the lagging casing, and the size in activity groove matches with the arm-tie size, and the arm-tie can stretch out the lagging casing along the activity groove, is equipped with stopper 33 on the arm-tie, and the size of stopper is greater than the activity groove, and the stopper is located the lagging casing, is equipped with the couple on the inner wall of lagging casing and the stopper respectively, and extension spring's both ends are connected with the couple respectively. A plurality of alignment holes 34 are arranged on the pulling plate at intervals, quartz cotton is bonded on the surface of the pulling plate, which is in contact with the first porous plate or the second porous plate, and the sealing performance is further ensured by arranging the quartz cotton; the end part of the pulling plate is provided with a handle 35, the handle is positioned outside the heat preservation shell, and the size of the handle is larger than that of the movable groove; pulling arm-tie until stopper butt lagging casing's inner wall, counterpoint hole and positive pole chamber intercommunication this moment, the arm-tie seals the negative pole chamber, and carbon fuel can be added loosens the arm-tie, and at extension spring's effort, the arm-tie return, counterpoint hole and negative pole chamber intercommunication this moment, the anode chamber is sealed to the arm-tie. Through setting up the stopper for the arm-tie is when pulling out completely, and the counterpoint hole reaches the effect of adding carbon fuel and discharge waste material with the corresponding in positive pole chamber, and after the completion of packing, extension spring assists the arm-tie and resets, seals the positive pole chamber.
As shown in fig. 1, the gas circulation device includes a gas storage tank 41, an intake manifold 42 and an exhaust manifold 43, the main pipes of the intake manifold and the exhaust manifold are connected with the gas storage tank, the branch pipes of the intake manifold and the exhaust manifold respectively penetrate through the heat preservation shell to be communicated with the anode cavity, the main pipe of the intake manifold is provided with a one-way intake valve 44, the main pipe of the exhaust manifold is provided with a one-way exhaust valve 45 and a manual valve 46, and the gas storage tank is provided with a pressure release valve 47.
The working method of the direct carbon solid oxide fuel cell structure with the exhaust gas recirculation comprises the following steps:
step S1: operating an automatic return mechanism on the first porous plate to enable the anode cavity to be communicated with the outside, sealing the cathode cavity at the moment, filling the solid carbon fuel into the anode cavity from the through hole, resetting the automatic return mechanism to enable the anode cavity to be sealed, and enabling the cathode cavity to be communicated with the outside to finish filling;
step S2: when the temperature reaches the working temperature, the battery structure starts to work, and CO are generated in the anode cavity2The air pressure is increased, when the air pressure value exceeds the pressure limit of the one-way air inlet valve, the one-way air inlet valve is opened, and CO are added2Gas enters the gas storage box from the anode cavity through the gas inlet manifold, the gas pressure continues to increase along with the reaction, and in order to prevent the cell structure from being damaged by overlarge gas pressure, the pressure release valve is opened to keep the internal gas pressure stable when the gas pressure value exceeds the limit value of the pressure release valve;
step S3: after the first reaction is finished, pulling open the automatic return mechanism on the second porous plate under the state that the manual valve is closed to enable the anode cavity to be communicated with the outside, sealing the cathode cavity, discharging waste materials in the anode cavity, simultaneously reducing the air pressure to be equal to the atmospheric pressure, resetting the automatic return mechanism to enable the cathode cavity to be communicated with the outside, sealing the anode cavity, and finishing discharging;
step S4: repeating step S1 to perform packing, and opening the packing when the second reaction is completedA manual valve, at the moment, the air pressure in the air storage box is larger than the air pressure in the anode cavity, and CO in the air storage box2Gas enters the anode cavity through the one-way exhaust valve and the exhaust manifold, the CO concentration in the anode cavity rises to rapidly participate in the reaction, the starting of the battery structure is accelerated, and CO is introduced into the anode cavity2CO is generated by reaction with solid carbon, the CO concentration in the anode cavity is further increased, and when the air pressure in the anode cavity exceeds the limit pressure of the one-way air inlet valve, the CO and the CO in the anode cavity2The gas flows into the gas storage tank again to prepare for the next cycle.
As mentioned above, the present invention can be better realized, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications made according to the present disclosure are intended to be covered by the scope of the claims of the present invention.

Claims (10)

1. A direct carbon solid oxide fuel cell structure with exhaust gas recirculation is characterized by comprising a heat-insulating shell and an internal electrode;
the internal electrode is positioned in the heat-insulation shell and comprises a battery plate, a cathode column and an anode column, the battery plate comprises an anode plate, a cathode plate and an electrolyte plate, the anode plate comprises a first surface and a second surface, the cathode plate comprises a third surface and a fourth surface, the electrolyte plate comprises a fifth surface and a sixth surface, the first surface is attached to the fifth surface, the third surface is attached to the sixth surface, the cathode column is connected with the cathode plate and the electrolyte plate together, the anode column is connected with the anode plate and the electrolyte plate together, and the anode column and the cathode column respectively penetrate out of the heat-insulation shell;
be equipped with first perforated plate and second perforated plate in the lagging casing, first perforated plate is located the top of panel, the second perforated plate is located the below of panel, the panel is wavy, the lagging casing, first perforated plate and second perforated plate enclose jointly and establish positive pole chamber and negative pole chamber that the panel formed the interval and set up, first perforated plate and second perforated plate correspond positive pole chamber and negative and positive negative chamber interval respectively and set up a plurality of through-holes, every through-hole and positive pole chamber or negative pole chamber intercommunication, be equipped with self return mechanism on first perforated plate and the second perforated plate respectively, self return mechanism is used for making one and external intercommunication in positive pole chamber and the negative pole chamber, another is sealed, the realization adds carbon fuel or the waste material of discharging.
2. The exhaust gas recirculation direct carbon solid oxide fuel cell structure of claim 1, it is characterized in that the automatic return mechanism comprises a pulling plate and an extension spring, a movable groove is arranged on the heat preservation shell, the size of the movable groove is matched with that of the pulling plate, the pulling plate can extend out of the heat preservation shell along the movable groove, a limiting block is arranged on the pulling plate, the size of the limiting block is larger than that of the movable groove, the limiting block is positioned in the heat preservation shell, one end of the extension spring is connected with the inner wall of the heat preservation shell, the other end of the extension spring is connected with the limiting block, a plurality of alignment holes are arranged on the pulling plate at intervals, the pulling plate is pulled until the limiting block is abutted against the inner wall of the heat preservation shell, the alignment holes are communicated with the anode cavity at the moment, the pulling plate seals the cathode cavity, carbon fuel can be added, the pulling plate is loosened, and under the action force of the extension spring, the pulling plate returns, the alignment hole is communicated with the cathode cavity, and the pulling plate seals the anode cavity.
3. The exhaust gas recirculation direct carbon solid oxide fuel cell structure according to claim 2, wherein hooks are respectively provided on the inner wall of the thermal insulation casing and the limiting block, and both ends of the extension spring are respectively connected with the hooks.
4. The exhaust gas recirculation direct carbon solid oxide fuel cell structure according to claim 2, wherein the surface of the pulling plate in contact with the first porous plate or the second porous plate is bonded with quartz wool.
5. The exhaust gas recirculation direct carbon solid oxide fuel cell structure according to claim 2, wherein the end of the pulling plate is provided with a handle, the handle is positioned outside the thermal insulation casing, and the size of the handle is larger than that of the movable groove.
6. The direct carbon solid oxide fuel cell structure of claim 1, further comprising a gas circulation device, wherein the gas circulation device comprises a gas storage tank, a gas inlet manifold and a gas outlet manifold, the main pipes of the gas inlet manifold and the gas outlet manifold are connected with the gas storage tank, the branch pipes of the gas inlet manifold and the gas outlet manifold respectively penetrate through the heat preservation shell to be communicated with the anode cavity, the main pipe of the gas inlet manifold is provided with a one-way gas inlet valve, the main pipe of the gas outlet manifold is provided with a one-way gas outlet valve and a manual valve, and the gas storage tank is provided with a pressure release valve.
7. The exhaust gas recirculation direct carbon solid oxide fuel cell structure according to claim 1, wherein the inner wall of the thermal insulation housing is provided with a bearing flange, and the first porous plate and the second porous plate are respectively placed on the bearing flange.
8. The exhaust gas recirculation direct carbon solid oxide fuel cell structure according to claim 1, wherein the anode plate, the cathode plate and the electrolyte plate are hermetically connected to the thermal insulation housing, the first porous plate and the second porous plate by silver paste, respectively, and the cathode pillar and the anode pillar are formed of silver paste.
9. The exhaust gas recirculation direct carbon solid oxide fuel cell structure according to claim 8, wherein the ends of the anode plate and the cathode plate are partially staggered in a vertical direction and a horizontal direction such that the ends of the anode plate and the ends of the cathode plate are not coplanar.
10. The exhaust gas recirculation direct carbon solid oxide fuel cell structure according to claim 1, wherein the first porous plate and the second porous plate are both made of an insulating ceramic material.
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