Solid oxide fuel cell stack module and use method thereof

Abstract

The invention relates to an electric pile module of a solid oxide fuel cell (SOFC (Solid Oxide Fuel Cell) for short) and a use method of the electric pile module. Comprising SOFC electric piles, a fuel distribution plate, a three-way metal ceramic connecting piece, a fuel inlet pipe, a fuel tail gas outlet pipe, a sealing insulation gasket, a current-conducting plate, a power leading rod, a module fan cover, a module bottom plate, a module top plate, a pressing screw rod, a nut, a ceramic spring, a pressing plate, an insulation sleeve and a high-temperature-resistant insulation felt, wherein the four SOFC electric piles in the SOFC electric pile module are arranged in a left row and a right row; one fuel distribution plate is arranged between the upper SOFC electric pile and the lower SOFC electric pile, and the left fuel distribution plate and the right fuel distribution plate are connected with the fuel inlet pipe and the fuel tail gas outlet pipe through the three-way metal ceramic connecting piece, so that the fuel is completely and uniformly distributed into the four SOFC electric piles; the uniformity of the temperature field of each SOFC electric pile and the consistency of the fuel utilization rate in the power generation process of the SOFC electric pile module are ensured, and the service life of the SOFC electric pile module is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell systems, and in particular to a solid oxide fuel cell stack module and a method of using the same. Background Art

[0002] Solid Oxide Fuel Cell (SOFC) is the most efficient power generation technology among all power generation equipment. The power generation efficiency of a single unit can reach more than 60%, and the pollutant emission level is low. It is a clean, low-carbon, safe and efficient power generation method. Therefore, it is considered to be a new energy power generation technology with the broadest development and application prospects in the future, and many researchers have devoted themselves to it.

[0003] The SOFC single cell structure currently under development is mainly divided into two basic structures, tubular and flat, according to the geometric shape. Tubular SOFC has currently demonstrated and operated many 100-kilowatt systems in the world, showing good long-term stability and high temperature and high pressure resistance, but its disadvantages are low power density and high preparation cost. The flat SOFC cell structure and preparation process are simpler than tubular SOFC, and the manufacturing cost is lower. The corresponding stack power requirement can be achieved by continuously stacking rectangular cells. For a flat cell, usually a cell can generate a voltage of 0.5-1V. In order to generate a high enough voltage, several cells need to be stacked to form a series structure, namely a SOFC stack. The core of the SOFC power generation system is the SOFC stack. The SOFC stack needs to have good stability and consistency, and the power of the SOFC stack should be as high as possible to achieve a large-scale, high-power power generation system. At present, the power of a single SOFC stack is relatively small, mostly at the kW level. In order to realize a high-power power generation system, multiple SOFC stacks need to be integrated into a SOFC stack module. It is necessary to solve many problems such as uniform distribution of air and fuel gas among multiple SOFC stacks, and conductivity, insulation, and compression between stacks.

[0004] When the SOFC stack module operates under ideal conditions, the cathode and anode gas flows allocated to each SOFC stack and each battery flow channel should be equal. However, in actual operation, since the SOFC stack requires an additional gas distribution structure for gas distribution, different SOFC stack arrangements and corresponding external gas distribution structures have a great impact on the gas distribution inside the SOFC stack. If the flow field distribution inside the SOFC cell is uneven, it will directly lead to uneven electrochemical reactions and affect the power generation efficiency. The uneven electrochemical reaction will also lead to uneven temperature fields. If the temperature difference is too large, it will affect the thermal stress of the solid electrode and electrolyte, thereby affecting the life. To improve the performance and life of SOFC cells and SOFC stacks, it is necessary to optimize the arrangement of the SOFC stack module to meet the external gas distribution structure so that the flow field distribution inside the SOFC is as uniform as possible.

[0005] In addition, when multiple battery stacks are stacked into a module, good insulation should be maintained between the battery stack and the module cover, top plate, and bottom plate. Different battery stacks have different requirements for clamping force under high temperature conditions. For example, a compression-sealed battery stack uses a sealing gasket for sealing, which requires a higher clamping force to maintain a good sealing effect. Therefore, the optimization of the insulating colorant and battery stack compression scheme in the battery stack module is of great significance to improving the working performance of the battery stack and extending the service life of the battery stack module. Summary of the invention

[0006] The conventional high-power SOFC system adopts a SOFC stack module design that is mainly stacked in a matrix, equipped with a complex gas distribution plate to achieve uniform distribution of gas in each SOFC stack in the SOFC stack module, but the gas distribution plate and pipeline design are complex and heavy, the compression design of the stack in the module is complex, and the material and processing costs are high. In order to solve the uniform distribution of gas in the SOFC stack module of the SOFC system, simplify the gas supply pipeline and stack compression method of the stack in the stack module, extend the service life of the SOFC stack module, optimize the SOFC stack layout, simplify the module design, reduce material and processing costs, etc., the present invention provides the following technical solutions:

[0007] The first object of the present invention is to provide a solid oxide fuel cell stack module, including a SOFC stack, a fuel distribution plate, a three-way metal ceramic connector, a fuel inlet pipe, a fuel exhaust gas outlet pipe, a sealing insulating gasket, a conductive plate, a lead-in rod, a module wind hood, a module bottom plate, a module top plate, a clamping screw, a nut, a ceramic spring, a clamping plate, an insulating sleeve, and a high-temperature resistant insulating felt. The four SOFC stacks in the SOFC stack module are arranged in two columns, left and right. A fuel distribution plate is used between the upper and lower SOFC stacks, and a three-way metal ceramic connector is used between the left and right fuel distribution plates to connect the fuel inlet pipe and the fuel exhaust gas outlet pipe, ensuring that the fuel is completely and evenly distributed to the four SOFC stacks, ensuring the uniformity of the temperature field of each SOFC stack and the consistency of the fuel utilization rate during the power generation process of the SOFC stack module, and helping to extend the service life of the SOFC stack module.

[0008] The four SOFC stacks in the SOFC stack module all adopt an open cathode design, and fresh high-temperature air can directly enter the SOFC stack from the front surface of the SOFC stack to participate in the electrochemical reaction and heat exchange, and the air exhaust directly flows out of the SOFC stack from the rear surface of the SOFC stack; two SOFC stacks in the SOFC stack module adopt A-type stacks and two SOFC stacks adopt B-type stacks, the positive electrode of the A-type stack is located at the top of the stack, the negative electrode is located at the bottom of the stack, and the fuel inlet and outlet are also located at the bottom of the stack, and the positive electrode of the B-type stack is located at the top of the stack, the negative electrode is located at the bottom of the stack, and the fuel inlet and outlet are located at the top of the stack; in the SOFC stack module, the upper left side adopts the A-type stack, the lower left side adopts the B-type stack, the upper right side adopts an inverted B-type stack, and the lower right side adopts an inverted A-type stack.

[0009] The module bottom plate is provided with two long air inlets, two long air outlets, a circular fuel inlet and a circular fuel outlet; fresh air enters the SOFC stack module through the two air inlets on the module bottom plate, and the gaps between the SOFC stack and the module wind hood, the module top plate and the SOFC stacks are filled with the high-temperature resistant insulating felt to prevent air from flowing directly through these gaps without entering the SOFC stack, so as to ensure the normal operation of the SOFC stack.

[0010] The fuel inlet and fuel outlet of the SOFC stack are respectively connected to the fuel port on the fuel distribution plate, and a sealed insulating gasket is used between the stack and the fuel distribution plate to prevent safety risks caused by leakage of combustible gas; the two fuel distribution plates are connected to the fuel inlet pipe, the fuel exhaust outlet pipe, and the three-way ceramic metal connector.

[0011] The three interfaces of the three-way ceramic metal connector are made of high-temperature resistant stainless steel, the middle insulating part is made of ceramic, and the part combining ceramic and high-temperature resistant stainless steel is welded with dissimilar materials to ensure the airtightness of the component at high temperature.

[0012] The upper and lower SOFC stacks are electrically connected by metal wires, the two SOFC stacks in the lower layer of the SOFC stack module are electrically connected through the conductive plate at the bottom, and the two SOFC stacks in the upper layer are respectively connected to the two lead-in rods to realize the current output of the SOFC stack module; the two lead-in rods are sheathed with insulating sleeves on the outside, passing through the module top plate and the clamping plate to prevent insulation short circuit; there are sealed insulating gaskets between the conductive plate and the module bottom plate, and there are sealed insulating gaskets between the two upper SOFC stacks and the clamping plate to prevent insulation short circuit.

[0013] The SOFC stack module adopts a spring compression method inside, which mainly includes the clamping plate, clamping screw, nut, and ceramic spring. A sealing insulating gasket is arranged between the clamping plate and the SOFC stack. The upper end of the clamping screw passes through the clamping plate, and the lower end is connected to the module bottom plate by a thread, and is connected with the nut and the ceramic spring to clamp the four stacks in the SOFC stack module to prevent the SOFC stack in the SOFC stack module from expanding and leaking at high temperature.

[0014] The fuel distribution plate, compression plate, fuel inlet pipe, fuel exhaust outlet pipe, conductive plate, lead-in rod, compression screw, nut, module hood, module bottom plate, and module top plate should be made of high-temperature resistant metal materials. If necessary, a coating that reduces the volatilization of metal Cr should be provided to reduce the poisoning of the SOFC stack cathode and extend the service life of the SOFC stack module.

[0015] The second object of the present invention is to provide a method for using the above-mentioned solid oxide fuel cell stack module, which includes the following contents: ① If the selected compression screw and nut are made of metal, when the stack module is assembled, the joint surface of the pressure reduction screw and the nut should be coated with high-temperature anti-sintering glue to ensure that the compression screw and the nut will not sinter together at high temperature. According to the needs of stack replacement, the stack module can be disassembled and reassembled; high-temperature resistant non-metallic materials can also be selected; ② According to the compression force requirements of the selected SOFC stack, a ceramic spring with appropriate elastic force is selected to ensure that the SOFC stack maintains an appropriate degree of compression at normal temperature and high temperature. , meet the compression force requirements of the sealing and insulating gasket; ③ The sealing and insulating gaskets selected in the SOFC stack module shall meet the sealing and insulation requirements at room temperature and high temperature at the same time. Vermiculite gaskets of appropriate thickness can be used. After the SOFC stack module is assembled, it shall undergo an airtightness test, and then perform heating, discharging, cooling and other operations in accordance with the SOFC stack manual; ④ According to the flow rate of fuel and air required by the SOFC stack module, select the appropriate diameter of the fuel inlet pipe and the fuel exhaust gas outlet pipe, and select the appropriate external dimensions of the module wind hood to ensure uniform distribution of fuel and air in the upper and lower layers of the SOFC stack module.

[0016] Compared with the prior art, the advantages of the present invention are as follows: the four SOFC stacks in the SOFC stack module are arranged in two left and right columns, a fuel distribution plate is used between the upper and lower SOFC stacks, and the left and right fuel distribution plates are connected to the fuel inlet pipe and the fuel exhaust gas outlet pipe by a three-way metal ceramic connector, thereby ensuring that the fuel is completely and evenly distributed to the four SOFC stacks, ensuring the uniformity of the temperature field of each SOFC stack and the consistency of the fuel utilization rate during the power generation process of the SOFC stack module, and helping to extend the service life of the SOFC stack module; in addition, the use of a clamping screw, a ceramic spring, a clamping plate, an insulating gasket, and an insulating sleeve solves the problem of stack compression and sealing under high temperature conditions of the SOFC stack module; the stack module has a simple overall structure, high space utilization, and is easy to process and manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the SOFC stack module;

[0019] Figure 2 This is an exploded view of the SOFC stack module;

[0020] Figure 3 It is a structural schematic diagram of the fuel distribution plate;

[0021] In the figure, 1. SOFC stack, 2. fuel distribution plate, 3. three-way metal ceramic connector, 4. fuel inlet pipe, 5. fuel exhaust outlet pipe, 6. sealing insulating gasket, 7. conductive plate, 8. lead-in rod, 9. module wind hood, 10. module bottom plate, 11. module top plate, 12. clamping screw, 13. nut, 14. ceramic spring, 15. clamping plate, 16. insulating sleeve, 17. high temperature resistant insulating felt. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0023] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings:

[0024] like Figure 2 As shown, a solid oxide fuel cell stack module includes a SOFC stack 1, a fuel distribution plate 2, a three-way metal ceramic connector 3, a fuel inlet pipe 4, a fuel exhaust outlet pipe 5, a sealing insulating gasket 6, a conductive plate 7, a lead-in rod 8, a module wind hood 9, a module bottom plate 10, a module top plate 11, a clamping screw 12, a nut 13, a ceramic spring 14, a clamping plate 15, an insulating sleeve 16, and a high-temperature resistant insulating felt 17.

[0025] The four SOFC stacks 1 in the SOFC stack module are arranged in two left and right columns, a fuel distribution plate 2 is used between the upper and lower SOFC stacks 1, and the left and right fuel distribution plates 2 are connected with the fuel inlet pipe 4 and the fuel exhaust gas outlet pipe 5 by a three-way metal ceramic connector 3, thereby ensuring that the fuel is completely and evenly distributed to the four SOFC stacks 1, ensuring the uniformity of the temperature field of each SOFC stack 1 and the consistency of the fuel utilization rate during the power generation process of the SOFC stack module, and helping to extend the service life of the SOFC stack module.

[0026] The four SOFC stacks 1 in the SOFC stack module all adopt an open cathode design, and fresh high-temperature air can directly enter the SOFC stack 1 from the front surface of the SOFC stack 1 to participate in the electrochemical reaction and heat exchange, and the air exhaust directly flows out of the SOFC stack 1 from the rear surface of the SOFC stack 1; two SOFC stacks in the SOFC stack module adopt A-type stacks, and two SOFC stacks adopt B-type stacks, the positive electrode of the A-type stack is located at the top of the stack, the negative electrode is located at the bottom of the stack, and the fuel inlet and outlet are also located at the bottom of the stack, and the positive electrode of the B-type stack is located at the top of the stack, the negative electrode is located at the bottom of the stack, and the fuel inlet and outlet are located at the top of the stack; in the SOFC stack module, the upper left side adopts the A-type stack, the lower left side adopts the B-type stack, the upper right side adopts an inverted B-type stack, and the lower right side adopts an inverted A-type stack.

[0027] The module bottom plate 10 is provided with two long air inlets, two long air outlets, a circular fuel inlet and a circular fuel outlet; fresh air enters the SOFC stack module through the two air inlets on the module bottom plate 10, and the gaps between the SOFC stack 1 and the module wind hood 9, the module top plate 11, and the SOFC stacks 1 are filled with the high-temperature resistant insulating felt 17 to prevent air from directly flowing through these gaps without entering the SOFC stack 1, so as to ensure the normal operation of the SOFC stack 1.

[0028] The fuel inlet and fuel outlet of the SOFC stack 1 are respectively connected to the fuel port on the fuel distribution plate 2. A sealed insulating gasket is used between the SOFC stack 1 and the fuel distribution plate 2 to prevent safety risks caused by leakage of combustible gas. The two fuel distribution plates 2 are connected to the fuel inlet pipe, the fuel exhaust outlet pipe, and the three-way ceramic metal connector.

[0029] The three interfaces of the three-way ceramic-metal connector 3 are made of high-temperature resistant stainless steel, the middle insulating part is made of ceramic, and the part combining ceramic and high-temperature resistant stainless steel is welded with dissimilar materials to ensure the airtightness of the component at high temperatures.

[0030] The upper and lower SOFC stacks 1 are electrically connected by metal wires. The two SOFC stacks 1 in the lower layer of the SOFC stack module are electrically connected through the conductive plate 7 at the bottom. The two SOFC stacks 1 in the upper layer are respectively connected to two lead-in rods 8 to achieve current output of the SOFC stack module. An insulating sleeve 16 is sleeved on the outer side 8 of the two lead-in rods, passing through the module top plate 11 and the clamping plate 15 to prevent insulation short circuit. A sealing insulating gasket 6 is provided between the conductive plate 7 and the module bottom plate 10, and a sealing insulating gasket 6 is provided between the two upper SOFC stacks and the clamping plate to prevent insulation short circuit.

[0031] The SOFC stack module adopts spring compression inside, mainly including the clamping plate 15, the clamping screw 12, the nut 13, and the ceramic spring 14. A sealing insulating gasket 6 is arranged between the clamping plate 15 and the SOFC stack 1. The upper end of the clamping screw 12 passes through the clamping plate 15, and the lower end is connected to the module bottom plate 10 by a thread, and is connected with the nut 13 and the ceramic spring 14 to clamp the four stacks in the SOFC stack module to prevent the SOFC stack 1 in the SOFC stack module from expanding and leaking at high temperature.

[0032] The fuel distribution plate 2, the pressing plate 15, the fuel inlet pipe 4, the fuel exhaust gas outlet pipe 5, the conductive plate 7, the lead rod 8, the pressing screw 12, the nut 13, the module wind cover 9, the module bottom plate 10, and the module top plate 11 should be made of high-temperature resistant metal materials. If necessary, a coating that reduces the volatilization of metal Cr should be provided to reduce the poisoning of the cathode of the SOFC stack 1 and extend the service life of the SOFC stack module.

[0033] The second purpose of the present invention is to provide a method for using the above-mentioned solid oxide fuel cell stack module, which includes the following contents: ① If the selected compression screw 12 and nut 13 are made of metal, when the stack module is assembled, the joint surface of the pressure reduction screw 12 and the nut 13 should be coated with high-temperature anti-sintering glue to ensure that the compression screw 12 and the nut 13 will not sinter together at high temperature. According to the requirements of stack replacement, the stack module can be disassembled and reassembled; high-temperature resistant non-metallic materials can also be selected; ② According to the clamping force requirements of the selected SOFC stack 1, a ceramic spring 14 with appropriate elastic force is selected to ensure that the SOFC stack 1 maintains appropriate pressure at room temperature and high temperature. The degree of compression meets the compression force requirements of the sealing insulating gasket 6; ③ The sealing insulating gasket 6 selected in the SOFC stack module shall meet the sealing and insulation requirements at room temperature and high temperature at the same time. Vermiculite gaskets of appropriate thickness can be used. After the SOFC stack module is assembled, it shall undergo an airtightness test, and then perform heating, discharging, cooling and other operations in accordance with the SOFC stack 1 manual; ④ According to the flow rate of fuel and air required by the SOFC stack module, select the appropriate diameter of the fuel inlet pipe 4 and the fuel exhaust gas outlet pipe 5, and select the appropriate appearance size of the module wind hood 9 to ensure the uniform distribution of fuel and air in the upper and lower layers of the SOFC stack module.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solid oxide fuel cell stack module, comprising a SOFC stack, a fuel distribution plate, a three-way metal ceramic connector, a fuel inlet pipe, a fuel exhaust outlet pipe, a sealing insulating gasket, a conductive plate, a lead-in rod, a module hood, a module bottom plate, a module top plate, a clamping screw, a nut, a ceramic spring, a clamping plate, an insulating sleeve, and a high-temperature resistant insulating felt. The four SOFC stacks in the SOFC stack module are arranged in two left and right columns, a fuel distribution plate is used between the upper and lower SOFC stacks, and a three-way metal ceramic connector is used between the left and right fuel distribution plates to connect the fuel inlet pipe and the fuel exhaust outlet pipe, thereby ensuring that the fuel is completely and evenly distributed to the four SOFC stacks, ensuring the uniformity of the temperature field of each SOFC stack and the consistency of the fuel utilization rate during the power generation process of the SOFC stack module, and helping to extend the service life of the SOFC stack module.

2. The solid oxide fuel cell stack module according to claim 1, characterized in that: The four SOFC stacks in the SOFC stack module all adopt an open cathode design, and fresh high-temperature air can directly enter the SOFC stack from the front surface of the SOFC stack to participate in the electrochemical reaction and heat exchange, and the air exhaust directly flows out of the SOFC stack from the rear surface of the SOFC stack; two SOFC stacks in the SOFC stack module adopt A-type stacks and two SOFC stacks adopt B-type stacks, the positive electrode of the A-type stack is located at the top of the stack, the negative electrode is located at the bottom of the stack, and the fuel inlet and outlet are also located at the bottom of the stack, and the positive electrode of the B-type stack is located at the top of the stack, the negative electrode is located at the bottom of the stack, and the fuel inlet and outlet are located at the top of the stack; in the SOFC stack module, the upper left side adopts the A-type stack, the lower left side adopts the B-type stack, the upper right side adopts an inverted B-type stack, and the lower right side adopts an inverted A-type stack.

3. The solid oxide fuel cell stack module according to claim 1, characterized in that: The module bottom plate is provided with two long air inlets, two long air outlets, a circular fuel inlet and a circular fuel outlet; fresh air enters the SOFC stack module through the two air inlets on the module bottom plate, and the gaps between the SOFC stack and the module wind hood, the module top plate and the SOFC stacks are filled with the high-temperature resistant insulating felt to prevent air from flowing directly through these gaps without entering the SOFC stack, so as to ensure the normal operation of the SOFC stack.

4. The solid oxide fuel cell stack module according to claim 1, characterized in that: The fuel inlet and fuel outlet of the SOFC stack are respectively connected to the fuel port on the fuel distribution plate, and a sealed insulating gasket is used between the stack and the fuel distribution plate to prevent safety risks caused by leakage of combustible gas; the two fuel distribution plates are connected to the fuel inlet pipe, the fuel exhaust outlet pipe, and the three-way ceramic metal connector.

5. The solid oxide fuel cell stack module according to claim 1, characterized in that: The three interfaces of the three-way ceramic metal connector are made of high-temperature resistant stainless steel, the middle insulating part is made of ceramic, and the part combining ceramic and high-temperature resistant stainless steel is welded with dissimilar materials to ensure the airtightness of the component at high temperature.

6. The solid oxide fuel cell stack module according to claim 1, characterized in that: The upper and lower SOFC stacks are electrically connected by metal wires, the two SOFC stacks in the lower layer of the SOFC stack module are electrically connected through the conductive plate at the bottom, and the two SOFC stacks in the upper layer are respectively connected to the two lead-in rods to realize the current output of the SOFC stack module; the two lead-in rods are sheathed with insulating sleeves on the outside, passing through the module top plate and the clamping plate to prevent insulation short circuit; there are sealed insulating gaskets between the conductive plate and the module bottom plate, and there are sealed insulating gaskets between the two upper SOFC stacks and the clamping plate to prevent insulation short circuit.

7. The solid oxide fuel cell stack module according to claim 1, characterized in that: The SOFC stack module adopts a spring compression method inside, which mainly includes the clamping plate, clamping screw, nut, and ceramic spring. A sealing insulating gasket is arranged between the clamping plate and the SOFC stack. The upper end of the clamping screw passes through the clamping plate, and the lower end is connected to the module bottom plate by a thread, and is connected with the nut and the ceramic spring to clamp the four stacks in the SOFC stack module to prevent the SOFC stack in the SOFC stack module from expanding and leaking at high temperature.

8. The solid oxide fuel cell stack module according to claim 1, characterized in that: The fuel distribution plate, compression plate, fuel inlet pipe, fuel exhaust outlet pipe, conductive plate, lead-in rod, compression screw, nut, module hood, module bottom plate, and module top plate should be made of high-temperature resistant metal materials. If necessary, a coating that reduces the volatilization of metal Cr should be provided to reduce the poisoning of the SOFC stack cathode and extend the service life of the SOFC stack module.

9. The method for using the solid oxide fuel cell stack module according to any one of claims 1 to 8, characterized in that: It includes the following: (1) If the selected compression screw and nut are made of metal, when assembling the stack module, the joint surface of the pressure drop screw and nut should be coated with high-temperature anti-sintering glue to ensure that the compression screw and nut will not sinter together at high temperature. The stack module can be disassembled and reassembled according to the needs of stack replacement; high-temperature resistant non-metallic materials can also be selected; (2) According to the compression force requirements of the selected SOFC stack, a ceramic spring with appropriate elastic force is selected to ensure that the SOFC stack maintains an appropriate degree of compression at room temperature and high temperature and meets the compression force requirements of the sealing insulation gasket; (3) The sealing and insulating gaskets used in the SOFC stack module should meet the sealing and insulation requirements at both room temperature and high temperature. Vermiculite gaskets of appropriate thickness can be used. After the SOFC stack module is assembled, it should undergo an airtightness test, and then the heating, discharging, and cooling operations should be carried out in accordance with the SOFC stack manual; (4) According to the fuel and air flow rates required by the SOFC stack module, select the appropriate diameters of the fuel inlet pipe and the fuel exhaust outlet pipe, and the appropriate external dimensions of the module air hood to ensure uniform distribution of fuel and air in the upper and lower layers of the SOFC stack module.

Images