A near-zero carbon emission direct coal fuel cell in-situ reforming system and power generation method

Abstract

The present invention provides a near-zero carbon emission direct coal fuel cell in-situ reforming system and power generation method. The system uses a flat solid oxide fuel cell based on an oxygen ion conductor, and silver nanoparticles are impregnated on the anode, which increases the length of the anode three-phase interface and introduces more stable silver nanoparticles to cover the anode surface, which can effectively improve the electrochemical performance of the battery and achieve efficient and stable output. At the same time, an in-situ reforming technology is adopted, and a bifunctional ceramic membrane is added at the outlet of the direct coal fuel cell, so that the carbon dioxide gas generated during the power generation process of the direct coal fuel cell permeates the bifunctional ceramic membrane, and reforms with methane under the action of high temperature and catalyst, and is converted into carbon monoxide and hydrogen, thereby solving the problem of treating the carbon dioxide gas generated by direct coal fuel cell power generation. The present invention utilizes a direct coal fuel cell coupled with the in-situ reforming of carbon dioxide and methane to achieve a near-zero carbon emission direct coal fuel cell power generation technology.

Description

Technical Field

[0001] The present invention relates to the field of electrochemical technology, and in particular to a near-zero carbon emission direct coal fuel cell in-situ reforming system and a power generation method. Background Art

[0002] As a highly efficient coal-fired power generation device, direct coal fuel cells can integrate and utilize coal, generate CO as fuel gas through the gasification reaction of CO2 and C at high temperature, and achieve efficient electrochemical power generation. They are expected to become an important part of the future energy supply system. At present, a large amount of CO2 is released in the process of electrochemical oxidation of coal for power generation. However, the existing technology does not effectively treat the generated CO2 gas. As the main greenhouse gas, CO2 will aggravate global warming and cause damage to the environment if it is directly discharged into the atmosphere. Therefore, how to achieve in-situ conversion of CO2 and effectively utilize the CO2 generated by electrochemical oxidation of coal for power generation has become an environmental problem that needs to be solved urgently.

[0003] Therefore, the existing technology needs to be improved. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a near-zero carbon emission direct coal fuel cell in-situ reforming system and power generation method, aiming to solve the problem that the large amount of CO2 released by the prior art direct coal fuel cell during the electrochemical oxidation discharge of coal cannot be effectively treated.

[0005] The technical solutions of the present invention are as follows:

[0006] In a first aspect, the present invention provides a near-zero carbon emission direct coal fuel cell in-situ reforming system, wherein the system includes a direct coal fuel cell for generating electricity using carbon-containing fuels, and also includes a bifunctional ceramic membrane for achieving carbon dioxide permeation and completing in-situ reforming with methane; the bifunctional ceramic membrane is connected to the anode gas outlet of the direct coal fuel cell.

[0007] The near-zero carbon emission direct coal fuel cell in-situ reforming system, wherein the direct coal fuel cell is a solid oxide fuel cell based on an oxygen ion conductor, and the anode of the solid oxide fuel cell is a porous anode composite of metallic nickel and electrolyte.

[0008] The near-zero carbon emission direct coal fuel cell in-situ reforming system, wherein silver nanoparticles are deposited on the porous anode composite of metallic nickel and electrolyte.

[0009] In the near-zero carbon emission direct coal fuel cell in-situ reforming system, the electrolyte is made of cationic conductive ceramic.

[0010] In the near-zero carbon emission direct coal fuel cell in-situ reforming system, the bifunctional ceramic membrane is based on an oxygen ion conductor electrolyte and a catalyst complex, and the matrix is impregnated with alkali metal carbonate.

[0011] The near-zero carbon emission direct coal fuel cell in-situ reforming system further includes a gas inlet pipeline.

[0012] In a second aspect, the present invention further provides a method for preparing a near-zero carbon emission direct coal fuel cell in-situ reforming system as described above, wherein the method for preparing the dual-function ceramic membrane comprises the steps of:

[0013] La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ The powder is mixed with an oxygen ion conductor electrolyte to obtain a mixed powder;

[0014] The mixed powder is pressed into a shape and calcined at a high temperature to obtain a dual-function ceramic membrane substrate;

[0015] A layer of alkali metal carbonate is laid on the bifunctional ceramic membrane substrate, and then maintained at 550° C. for 2 hours to obtain the bifunctional ceramic membrane.

[0016] The preparation method of the near-zero carbon emission direct coal fuel cell in-situ reforming system, wherein the La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ The method for preparing the powder comprises the steps of:

[0017] The nitrate precursor of the perovskite oxide is dissolved in water, and then citric acid and EDTA are added to the solution, and the pH value is adjusted to 7-8 with ammonia water; thereafter, the solution is stirred until it is converted into a sol-gel state, and dried at 160-200°C for 4-6 hours to obtain a black precursor; the black precursor is calcined in air at 900-1000°C for 3.5-4.5 hours to form the La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ Powder.

[0018] The preparation method of the near-zero carbon emission direct coal fuel cell in-situ reforming system, wherein the preparation method of the porous anode composited with metallic nickel and electrolyte comprises the steps of:

[0019] Dissolve silver nitrate in deionized water to prepare a silver nitrate anode impregnation solution;

[0020] Under vacuum conditions, dripping silver nitrate anode impregnation liquid onto the anode surface of the solid oxide fuel cell stack, and after soaking for a predetermined time, removing excess impregnation liquid from the anode surface;

[0021] firing the battery pack impregnated with the impregnation liquid under predetermined conditions;

[0022] The above process was repeated four times, and finally sintered at 900° C. for 2 hours to obtain a porous anode composed of metallic nickel and electrolyte on which silver nanoparticles were deposited.

[0023] In a third aspect, the present invention further provides a method for power generation using a near-zero carbon emission direct coal fuel cell in-situ reforming system as described above, comprising the steps of:

[0024] Power generation using direct coal fuel cells;

[0025] The carbon dioxide gas generated during the direct coal fuel cell power generation process is permeated through the dual-function ceramic membrane;

[0026] In-situ reforming technology is used to reform carbon dioxide gas and methane and convert them into carbon monoxide and hydrogen.

[0027] Beneficial effects: The present invention provides a near-zero carbon emission direct coal fuel cell in-situ reforming system and power generation method. The system uses a flat solid oxide fuel cell based on an oxygen ion conductor, and impregnates silver nanoparticles on the anode, which increases the length of the anode three-phase interface and introduces more stable silver nanoparticles to cover the anode surface, which can effectively improve the electrochemical performance of the battery and achieve efficient and stable output of the direct coal fuel cell. At the same time, an in-situ reforming technology is adopted to add a bifunctional ceramic membrane at the outlet of the direct coal fuel cell, so that the carbon dioxide gas generated during the power generation process of the direct coal fuel cell permeates the bifunctional ceramic membrane and reforms with methane under the action of high temperature and catalyst, so that the carbon dioxide gas is converted into high-value-added synthesis gas (carbon monoxide and hydrogen) through reforming. This solves the problem that the carbon dioxide gas generated by direct coal fuel cell power generation cannot be effectively treated. The present invention utilizes a direct coal fuel cell coupled with an in-situ reforming of carbon dioxide and methane to convert the carbon dioxide generated during the operation of the direct coal fuel cell into a synthesis gas composed of carbon monoxide and hydrogen in situ, truly realizing a near-zero carbon emission direct coal fuel cell power generation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of an in-situ reforming system for a near-zero carbon emission direct coal fuel cell according to an embodiment of the present invention.

[0029] Figure 2Schematic diagram of a preferred process for preparing a porous anode composited with metallic nickel and an electrolyte according to an embodiment of the present invention.

[0030] Figure 3 This is a graph showing the power density test results of a direct coal fuel cell in an embodiment of the present invention.

[0031] Figure 4 This is a preferred flow chart of a power generation method of a near-zero carbon emission direct coal fuel cell in-situ reforming system in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention provides a near-zero carbon emission direct coal fuel cell in-situ reforming system and power generation method. To make the objectives, technical solutions, and effects of the present invention more clear and explicit, the present invention is further described below in detail. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0033] like Figure 1 As shown, the present invention discloses a near-zero carbon emission direct coal fuel cell in-situ reforming system, which includes a quartz tube 10, a direct coal fuel cell 20, and a bifunctional ceramic membrane 30; the direct coal fuel cell 20 is located at the bottom of the quartz tube 10, and the bifunctional ceramic membrane 30 is connected to the anode gas outlet of the direct coal fuel cell 20; the top of the quartz tube 10 also includes a gas inlet pipe 40.

[0034] In the prior art, direct coal fuel cells release a large amount of carbon dioxide during the process of generating electricity through the electrochemical oxidation of coal. The large amount of carbon dioxide released as a by-product of power generation is often not effectively treated, causing great harm to the environment (greenhouse effect). In order to solve this technical problem, the embodiment of the present invention adopts in-situ reforming technology, that is, adding a bifunctional ceramic membrane at the outlet of the direct coal fuel cell, so that the carbon dioxide gas generated during the power generation process of the direct coal fuel cell permeates the bifunctional ceramic membrane and reforms with methane under the action of high temperature and catalyst, so that the carbon dioxide gas is converted into high-value-added synthesis gas (carbon monoxide and hydrogen) through reforming, thereby effectively solving the problem that the carbon dioxide gas generated by direct coal fuel cell power generation cannot be effectively treated.

[0035] In some embodiments, the direct coal fuel cell is a solid oxide fuel cell based on an oxygen ion conductor, and the anode of the solid oxide fuel cell is a porous anode composited with metallic nickel and an electrolyte.

[0036] In some preferred embodiments, the direct coal fuel cell is a planar solid oxide fuel cell based on an oxygen ion conductor.

[0037] In some embodiments, silver nanoparticles are deposited on the porous anode of the nickel-electrolyte composite. Impregnation of the anode with silver (Ag) nanoparticles increases the length of the anode three-phase interface and introduces more stable silver nanoparticles covering the anode surface, effectively improving the electrochemical performance of the battery and achieving efficient and stable output of the direct coal fuel cell.

[0038] In some embodiments, the direct coal fuel cell undergoes the following reaction at high temperature:

[0039] Anode reaction: C+2O 2- =CO2+4e - ;

[0040] Cathode zone reaction: 2O2+4e - =2O 2- .

[0041] The above reaction demonstrates that a large amount of CO2 is generated in the anode region of a direct coal fuel cell during the electrochemical oxidation discharge of coal. This CO2 gas diffuses through the anode gas outlet of the direct coal fuel cell to the bifunctional ceramic membrane, where it permeates and reforms, achieving in-situ conversion of carbon dioxide.

[0042] In some embodiments, the preparation method of the porous anode composited with metallic nickel and electrolyte is as follows:

[0043] S10, dissolving silver nitrate in deionized water to prepare a silver nitrate anode impregnation solution;

[0044] S20, under vacuum conditions, dripping a silver nitrate anode impregnation solution onto the anode surface of the solid oxide fuel cell stack, and after soaking for a predetermined time, removing excess impregnation solution from the anode surface;

[0045] S30, firing the battery pack soaked in the impregnation liquid under predetermined conditions;

[0046] S40, the above process is repeated four times, and finally sintered at 900° C. for 2 hours to obtain a porous anode composed of metallic nickel and electrolyte on which silver nanoparticles are deposited.

[0047] Figure 2 The figure shows a schematic flow chart of a method for preparing a porous anode according to an embodiment of the present invention. First, nickel oxide is mixed with YSZ (yttrium-doped zirconia), ball-milled, and then pressed into a shape. The mixture is then calcined and impregnated with a silver nitrate / glycine solution. Finally, the mixture is sintered to obtain a porous anode composed of nickel and electrolyte.

[0048] In some specific embodiments, in step S10, the concentration of the silver nitrate anode impregnation solution is in the range of 0.4-0.6 mol / L, preferably 0.5 mol / L.

[0049] In some specific embodiments, after step S10, an appropriate amount of glycine may be added to the impregnation solution to play a complexing role and promote the formation of a perovskite phase at a lower temperature.

[0050] In some specific embodiments, in step S20, a microliter syringe may be used to drip a silver nitrate anode impregnation solution onto the anode surface of the battery. The predetermined time is, but is not limited to, 5 minutes. The time is sufficient to allow the impregnation solution to penetrate the anode skeleton, and can be appropriately extended or shortened depending on the impregnation conditions.

[0051] In some specific embodiments, in step S30, the predetermined condition is firing at 400°C for 30 minutes with a heating rate of 2°C / minute, but the present invention is not limited thereto.

[0052] In some embodiments, the electrolyte is made of cation conductive ceramic.

[0053] In some embodiments, the bifunctional ceramic membrane 30 includes a permeable membrane 301 and a catalyst 302. After passing through the permeable membrane 301, the carbon dioxide gas reacts with the methane under the action of the catalyst 302. However, this is not limiting. In other embodiments, the catalyst may be incorporated into the permeable membrane to form a mixed whole. Figure 1 The above is only one possible combination provided by the embodiment of the present invention and should not be considered as limiting the present invention.

[0054] In some embodiments, the bifunctional ceramic membrane comprises a porous oxygen ion conductor electrolyte and a catalyst composite as a matrix, wherein the matrix is impregnated with an alkali metal carbonate. The oxygen ion conductor electrolyte is rich in pores, which facilitates gas permeation and capture.

[0055] In some embodiments, the method for preparing the dual-function ceramic membrane comprises the steps of:

[0056] S100, La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ The powder is mixed with an oxygen ion conductor electrolyte to obtain a mixed powder;

[0057] S200, pressing the mixed powder into a shape, and calcining it at a high temperature to obtain a dual-function ceramic membrane substrate;

[0058] S300, laying a layer of alkali metal carbonate on the base of the dual-function ceramic membrane, and then maintaining the temperature at 550° C. for 2 hours, and waiting for the molten carbonate to penetrate into the base material, thereby obtaining the dual-function ceramic membrane.

[0059] In some embodiments, the raw materials for preparing the dual-function ceramic membrane substrate are not limited to La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ (LSFN) powder, or any other suitable perovskite catalyst, such as La 0.7 Sr 0.3 Co 0.8 Fe 0.2 O 3-δ (LSCF), La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3-δ Powder.

[0060] Preferably, the oxygen ion conductor uses Sm 0.2 Ce 0.8 O 1.9 (SDC) electrolyte, which has high oxygen ion conductivity. The oxygen ion conductor electrolyte and alkali metal carbonate respectively play the role of conducting oxygen ions and carbonate ions. On the CO2-rich side, CO2 combines with oxygen ions conducted through the SDC electrolyte to form carbonate ions, which are then conducted to the CO2-lean side through the molten carbonate and decomposed into oxygen ions and CO2, thereby achieving gas permeation and capture.

[0061] In some preferred embodiments, the La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ The mass ratio of powder to SDC is 3:7.

[0062] In some preferred embodiments, in step S200, the high-temperature calcination temperature is 1050°C-1150°C, preferably 1100°C. At these temperatures, the resulting dual-function ceramic membrane is rich in pores and possesses good mechanical strength, allowing for sufficient contact between the catalyst and the permeating gas, thereby improving catalytic efficiency. In some embodiments, in step S300, the alkali metal carbonate is a mixture of potassium carbonate and potassium carbonate in a molar volume ratio of 0.5-2:1, preferably 1:1. At these molar ratios, the alkali metal carbonate has a lower melting point and higher carbonate ion conductivity. The process is then maintained at 550°C for 2 hours to fully penetrate the substrate material with the molten carbonate. At these operating temperatures, the molten alkali metal carbonate acts as a carbonate ion conductor: on the CO2-rich side, CO2 combines with oxygen ions conducted through the SDC electrolyte to form carbonate ions, which are then conducted to the CO2-depleted side via the molten carbonate and decomposed into oxygen ions and CO2, thereby enabling gas permeation and capture.

[0063] In some embodiments, the La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ The preparation method of the powder is:

[0064] The nitrate precursor of the perovskite oxide is dissolved in water, and then citric acid and EDTA are added to the solution, and the pH value is adjusted to 7-8 with ammonia water; thereafter, the solution is stirred until it is converted into a sol-gel state, and dried at 160-200°C for 4-6 hours to obtain a black precursor; the black precursor is calcined in air at 900-1000°C for 3.5-4.5 hours to form the La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ Powder.

[0065] In some preferred embodiments, the nitrate of the perovskite oxide is a salt containing La, Sr, Fe, and Ni ions.

[0066] In some embodiments, the near-zero carbon emission direct coal fuel cell in-situ reforming system further includes a gas intake pipeline 40 .

[0067] The gas inlet pipe 40 extends from the top of the quartz tube 10 and leads to the dual-function ceramic membrane 30, so that the gas introduced reacts with carbon dioxide on the dual-function ceramic membrane.

[0068] The present invention provides a near-zero carbon emission direct coal fuel cell in-situ reforming system. This system utilizes a direct coal fuel cell coupled with a bifunctional ceramic membrane. A planar solid oxide fuel cell based on an oxygen ion conductor is used, and silver nanoparticles are impregnated on the anode. A bifunctional ceramic membrane is added at the outlet of the direct coal fuel cell. This allows the carbon dioxide generated during the direct coal fuel cell power generation process to permeate the bifunctional ceramic membrane and be reformed in situ to convert it into high-value-added synthesis gas. Performance testing of the direct coal fuel cell power generation system was conducted. Figure 3 Shown is the power density data of the battery. Figure 3 It can be seen that the battery has a large power density, which shows that the direct coal fuel cell can output efficiently and stably, which also proves the feasibility of the above device in practice.

[0069] The embodiment of the present invention also provides a method for generating electricity from the above-mentioned near-zero carbon emission direct coal fuel cell in-situ reforming system, such as Figure 4 As shown, the steps include:

[0070] S1000, using direct coal fuel cells for power generation;

[0071] S2000, permeating carbon dioxide gas generated during direct coal fuel cell power generation through a dual-function ceramic membrane;

[0072] S3000 uses in-situ reforming technology to reform carbon dioxide gas and methane and convert them into carbon monoxide and hydrogen.

[0073] In some embodiments, in step S1000, the reaction for generating electricity using a direct coal fuel cell is:

[0074] Anode reaction: C+2O 2- =CO2+4e - ;

[0075] Cathode zone reaction: 2O2+4e - =2O 2- .

[0076] After the reaction is completed, a large amount of CO2 is produced in the anode region of the direct coal fuel cell stack.

[0077] In some embodiments, the CO2 gas generated in step S1000 diffuses to the bifunctional ceramic membrane via the anode gas outlet of the direct coal fuel cell, and completes CO2 permeation on the bifunctional ceramic membrane.

[0078] In some embodiments, in step S3000, carbon dioxide gas is reformed with methane and converted into carbon monoxide and hydrogen by the reaction formula:

[0079] CO2+CH4=CO+2H2;

[0080] The gas inlet pipe at the top of the quartz tube is fed with gas, the main component of which is methane (CH4). After the methane reaches the dual-function ceramic membrane, it is directly reformed with the permeated carbon dioxide gas on the dual-function ceramic membrane, and the carbon dioxide gas is converted in situ into a synthesis gas composed of carbon monoxide and hydrogen, thereby truly realizing the in-situ reforming of carbon dioxide. Compared with the prior art, the dual-function ceramic membrane provided by the embodiment of the present invention combines the two functions of permeation and reforming into one, and realizes dual functions at the same time, truly achieving the in-situ conversion of carbon dioxide. This is the first time that this has been achieved in the processing technology of carbon dioxide, a product of direct coal fuel cells. It not only reduces the complexity of the device, reduces the cost and energy consumption for carbon dioxide capture and conversion, but also effectively prevents the escape of carbon dioxide gas, improves the conversion efficiency, and can almost achieve zero emissions of carbon dioxide, committed to achieving the global goal of carbon neutrality.

[0081] In some embodiments, in step S3000, the carbon dioxide gas is reformed with methane under the action of a high temperature and a catalyst.

[0082] In some preferred embodiments, the reaction temperature is 600°C-1000°C, preferably 1100°C.

[0083] In some preferred embodiments, the catalyst is LSFN (La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ ) perovskite catalyst, but is not limited thereto, and can also be any other suitable catalyst.

[0084] The power generation method of the near-zero carbon emission direct coal fuel cell in-situ reforming system described in the embodiment of the present invention utilizes the coupling of the direct coal fuel cell with the carbon dioxide methane reforming to convert the carbon dioxide generated by the direct coal fuel cell during operation into a synthesis gas composed of carbon monoxide and hydrogen in situ, truly realizing the near-zero carbon emission direct coal fuel cell power generation technology.

[0085] In summary, the present invention provides a near-zero carbon emission direct coal fuel cell in-situ reforming system and power generation method. The system uses a flat solid oxide fuel cell based on an oxygen ion conductor and impregnates silver nanoparticles on the anode, increases the length of the anode three-phase interface and introduces more stable silver nanoparticles to cover the anode surface, which can effectively improve the electrochemical performance of the battery and achieve efficient and stable output of the direct coal fuel cell. At the same time, an in-situ reforming technology is adopted to add a bifunctional ceramic membrane at the outlet of the direct coal fuel cell so that the carbon dioxide gas generated during the power generation process of the direct coal fuel cell permeates the bifunctional ceramic membrane and reforms with methane under the action of high temperature and catalyst, so that the carbon dioxide gas is converted into high value-added synthesis gas (carbon monoxide and hydrogen) through reforming. This solves the problem that the carbon dioxide gas generated by direct coal fuel cell power generation cannot be effectively treated. The present invention utilizes a direct coal fuel cell coupled with a carbon dioxide methane in-situ reforming phase to convert the carbon dioxide generated during the operation of the direct coal fuel cell into a synthesis gas composed of carbon monoxide and hydrogen in situ, truly realizing a near-zero carbon emission direct coal fuel cell power generation technology.

[0086] It should be understood that the application of the present invention is not limited to the above examples. For those skilled in the art, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A direct coal fuel cell in-situ reforming system, characterized in that: The system includes a direct coal fuel cell for generating electricity using a carbon-containing fuel, and also includes a bifunctional ceramic membrane for achieving carbon dioxide permeation and completing in-situ reforming with methane; the bifunctional ceramic membrane is connected to the anode gas outlet of the direct coal fuel cell; The dual-function ceramic membrane uses a porous oxygen ion conductor electrolyte and a catalyst complex as a matrix, and the matrix is immersed in alkali metal carbonate; the catalyst is a perovskite catalyst.

2. The direct coal fuel cell in-situ reforming system according to claim 1, characterized in that: The direct coal fuel cell is a solid oxide fuel cell based on an oxygen ion conductor, and the anode of the solid oxide fuel cell is a porous anode composite of metal nickel and electrolyte.

3. The direct coal fuel cell in-situ reforming system according to claim 2, characterized in that: Silver nanoparticles are deposited on the porous anode composited with metallic nickel and electrolyte.

4. The direct coal fuel cell in-situ reforming system according to claim 2, characterized in that: The electrolyte is made of cation conductor ceramics.

5. The direct coal fuel cell in-situ reforming system according to claim 1, characterized in that: The system also includes a gas intake pipe.

6. A method for preparing a direct coal fuel cell in-situ reforming system according to any one of claims 2 to 4, characterized in that: The preparation method of the dual-function ceramic membrane comprises the following steps: La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ The powder is mixed with an oxygen ion conductor electrolyte to obtain a mixed powder; The mixed powder is pressed into a shape and calcined at a high temperature to obtain a dual-function ceramic membrane substrate; A layer of alkali metal carbonate is laid on the bifunctional ceramic membrane substrate, and then maintained at 550° C. for 2 hours to obtain the bifunctional ceramic membrane.

7. The method for preparing a direct coal fuel cell in-situ reforming system according to claim 6, characterized in that: The La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ The method for preparing the powder comprises the steps of: The nitrate precursor of the perovskite oxide is dissolved in water, and then citric acid and EDTA are added to the solution, and the pH value is adjusted to 7-8 with ammonia water; thereafter, the solution is stirred until it converts to a sol-gel state, and dried at 160-200°C for 4-6 hours to obtain a black precursor; the black precursor is calcined in air at 900-1000°C for 3.5-4.5 hours to form the La 0.7 Sr 0.3 Fe 0.8 Ni 0.2 O 3-δ Powder.

8. The method for preparing a direct coal fuel cell in-situ reforming system according to claim 6, characterized in that: The method for preparing the porous anode composited with metallic nickel and electrolyte comprises the following steps: Dissolve silver nitrate in deionized water to prepare a silver nitrate anode impregnation solution; Under vacuum conditions, dripping silver nitrate anode impregnation solution onto the anode surface of the solid oxide fuel cell, soaking for a predetermined time, and then removing excess impregnation solution from the anode surface; firing the solid oxide fuel cell impregnated with the impregnation liquid under predetermined conditions; The above process was repeated four times, and finally sintered at 900°C for 2 hours to obtain a porous anode composed of metallic nickel and electrolyte with silver nanoparticles deposited thereon.

9. A method for power generation according to any one of claims 1 to 5, wherein: Including steps: Power generation using direct coal fuel cells; The carbon dioxide gas generated during the direct coal fuel cell power generation process is permeated through the dual-function ceramic membrane; In-situ reforming technology is used to reform carbon dioxide gas and methane and convert them into carbon monoxide and hydrogen.

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