Micro-tube type solid oxidation fuel cell stack capable of uniformly distributing gas

Abstract

The invention relates to the technical field of fuel cells, and particularly discloses a gas uniformly-distributed micro-tube type solid oxide fuel cell stack, which comprises a shell and a plurality of solid oxide fuel cell tubes, a fuel distributor and a fuel outlet cavity are arranged at the two ends of the shell respectively, and a fluid cavity is formed among the shell, the fuel distributor and the fuel outlet cavity. A fuel gas inlet and a fuel cavity are formed in the fuel distributor; two ends of the solid oxide fuel cell tube are respectively connected with the fuel distributor and the fuel outlet cavity; a guide plate is arranged on the solid oxide fuel cell tube; according to the micro-tube type solid oxidation fuel cell stack capable of uniformly distributing the gas, the structures of the fuel gas side and the air side are optimized, so that the uniform distribution of the fuel gas and the uniform flowing of the gas on the air side are realized, and the problems that the gas in the solid oxidation fuel cell stack is non-uniform in distribution and poor in flowability are solved; and the influence on the performance and the long-term operation stability of the galvanic pile is also avoided.

Description

Technical Field

[0001] The invention relates to the technical field of fuel cells, and in particular to a micro-tubular solid oxidation fuel cell stack with uniform gas distribution. Background Art

[0002] In the operation of solid oxide fuel cell stacks, uniform gas distribution plays a decisive role in their performance. However, at present, many fuel cell stacks generally have the problem of uneven gas distribution. This problem will lead to a series of serious consequences. From the perspective of electrochemical reaction kinetics, the uneven distribution of gas concentration breaks the ideal reaction gas ratio at each reaction site, making it impossible for the reaction to proceed according to the optimal stoichiometric ratio. Insufficient fuel gas distribution will limit the anode oxidation reaction rate and inhibit the generation of electrons; while uneven air distribution will weaken the cathode reduction reaction and reduce the power output and energy conversion efficiency of the battery stack as a whole.

[0003] Whether it is the anode or the cathode, the difference in electrochemical reaction intensity caused by uneven gas distribution will eventually lead to different heat generation in the battery and produce a large temperature gradient. Since the battery stack is usually composed of a variety of different materials, such as ceramic electrolytes, metal electrodes and connectors, these materials have different thermal expansion coefficients. Therefore, when there is a large temperature gradient inside the battery stack, the materials in different temperature zones have different degrees of thermal expansion, which will generate constraint stress, that is, thermal stress, between each other. Under the action of this thermal stress for a long time, the battery components are prone to deformation and cracking, especially at the interface of the material, where the thermal stress concentration is more obvious, which will seriously damage the structural integrity of the battery components and reduce the reliability and service life of the battery stack. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a micro-tubular solid oxide fuel cell stack with uniform gas distribution, which realizes uniform distribution of fuel gas and uniform flow of gas on the air side, thereby solving the impact of uneven gas distribution and poor gas fluidity inside the solid oxide fuel cell stack on the stack performance and long-term operation stability.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A micro-tube solid oxide fuel cell stack with uniform gas distribution comprises: a housing and a plurality of solid oxide fuel cell tubes;

[0007] A fuel distributor and a fuel outlet cavity are respectively disposed at two ends of the shell, and a fluid cavity is formed between the shell, the fuel distributor and the fuel outlet cavity;

[0008] The fuel distributor is provided with a fuel gas inlet and a fuel cavity, and the fuel gas inlet is communicated with the fuel cavity;

[0009] The two ends of the solid oxide fuel cell tube are respectively connected to the fuel distributor and the fuel outlet cavity, and the solid oxide fuel cell tube is not connected to the fluid cavity;

[0010] At least one air inlet and at least one air outlet are respectively provided at two ends of the housing, and the at least one air inlet and the at least one air outlet are both communicated with the fluid cavity;

[0011] The solid oxide fuel cell tube is arranged in the housing, and a guide plate is arranged on the solid oxide fuel cell tube.

[0012] In the micro-tubular solid oxidation fuel cell stack with uniform gas distribution provided in at least one embodiment of the present disclosure, the fuel distributor comprises: an arc plate and a backflow prevention structure;

[0013] The arc plate is used to achieve uniform distribution of fuel gas, the arc plate is located behind the anti-backflow structure, and the arc plate is fixedly connected to the anti-backflow structure;

[0014] The anti-backflow structure is located behind the fuel gas inlet;

[0015] The arc-shaped plate has a first gas port, the first gas port is communicated with the fuel cavity, and the head end of the solid oxide fuel cell tube is connected to the first gas port.

[0016] In the micro-tubular solid oxidation fuel cell stack with uniform gas distribution provided in at least one embodiment of the present disclosure, the guide plate comprises: a guide portion and a connecting portion;

[0017] The plurality of solid oxide fuel cell tubes are connected via the connecting portion.

[0018] In the micro-tubular solid oxidation fuel cell stack with uniform gas distribution provided in at least one embodiment of the present disclosure, a double-layer sealing structure is provided between the outer shell and the fuel distributor.

[0019] In the micro-tubular solid oxidation fuel cell stack with uniform gas distribution provided in at least one embodiment of the present disclosure, at least three guide plates are provided, and at least three guide plates are distributed at intervals.

[0020] In the micro-tubular solid oxidation fuel cell stack with uniform gas distribution provided in at least one embodiment of the present disclosure, the fuel outlet cavity is arranged in a funnel shape;

[0021] A connector is arranged in the fuel outlet cavity, a second gas port is arranged on the connector, and the end of the solid oxide fuel cell tube is connected to the second gas port.

[0022] In the micro-tube solid oxide fuel cell stack with uniform gas distribution provided in at least one embodiment of the present disclosure, a sealing gasket is provided between the end of the solid oxide fuel cell tube and the second gas port, and the solid oxide fuel cell tube and the second gas port are sealed by the sealing gasket.

[0023] In the micro-tubular solid oxidation fuel cell stack with uniform gas distribution provided by at least one embodiment of the present disclosure, the fuel cavity is formed between the arc plate and the backflow prevention structure.

[0024] In the micro-tubular solid oxidation fuel cell stack with uniform gas distribution provided by at least one embodiment of the present disclosure, the convex surface of the arc plate is located in the fuel cavity, and the concave surface of the arc plate is located in the fluid cavity.

[0025] In the micro-tube solid oxide fuel cell stack with uniform gas distribution provided in at least one embodiment of the present disclosure, there is a gap between adjacent solid oxide fuel cell tubes;

[0026] The central axis of the solid oxide fuel cell tube is parallel to the central axis of the shell.

[0027] The beneficial effects of the present invention are:

[0028] 1. By setting up a fuel distributor, the gas can be evenly distributed. The convex surface of the arc plate faces the fuel gas inlet, so that after the airflow hits the arc plate, most of the gas flows to both sides along the arc line, avoiding the concentration of fuel gas in the central tube bundle, and making the gas more evenly distributed.

[0029] 2. The fuel distributor is equipped with an anti-backflow structure, which guides the airflow path through the structural setting to hinder gas backflow, greatly improving safety. It can not only avoid the danger caused by the backflow of fuel gas and mixing with the outside air, but also prevent the occurrence of back-mixing, ensuring the orderly flow of gas in the fuel cell stack and improving the performance and reliability of the fuel cell stack.

[0030] 3. Use the guide plate to guide the air flow so that the airflow can flow through all the tube bundles, avoiding the performance differences of different battery tube bundles and large temperature gradients caused by uneven flow. In addition, the guide plate can also make the air flow in multiple paths and periodically between the battery tube bundles, promote the contact between the air and the battery tube bundle, enhance the battery electrochemical reaction, and ultimately improve the performance of the battery stack.

[0031] 4. The guide plate can guide air flow and promote the heat transfer efficiency of the battery, reduce the battery temperature gradient, and achieve the effect of reducing battery thermal stress and improving the long-term working stability of the battery.

[0032] 5. The guide plate adopts a partition design, in which the contact position with the solid oxide fuel cell tube is the connection part, which plays the role of connecting the solid oxide fuel cell tube in series, and the periphery of the connection part is the guide part. This partition design makes use of the connection part between the guide plate and the solid oxide fuel cell tube, avoiding the cost loss and space waste caused by adding an additional battery connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.

[0034] Figure 1 This is a three-dimensional diagram of a micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to the present invention.

[0035] Figure 2 This is a cross-sectional view of a micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to the present invention.

[0036] Figure 3 A cross-sectional view of the fuel distributor.

[0037] Figure 4 This is a cross-sectional view of the fuel outlet cavity.

[0038] Figure 5 Schematic diagram of the connection between the solid oxide fuel cell tube and the guide plate.

[0039] Figure 6 A three-dimensional diagram of the guide plate.

[0040] Figure 7 Velocity vector distribution diagram of the FLUENT numerical simulation results at the inlet of the micro-tubular solid oxide fuel cell stack with uniform gas distribution in the embodiment (left) and the stack structure without adding an anti-backflow structure (right).

[0041] Figure 8 The pressure cloud diagram of the FLUENT numerical simulation results at the inlet of the micro-tubular solid oxide fuel cell stack with uniform gas distribution in the embodiment (left) and the stack structure without adding an anti-backflow structure (right).

[0042] Fig. 9 Velocity cloud diagram of the FLUENT numerical simulation results of the central cross section of the air side of a micro-tubular solid oxide fuel cell stack with uniform gas distribution in the embodiment (left) and a stack structure without adding a guide plate (right).

[0043] Fig.10Temperature cloud diagram of the FLUENT numerical simulation results of the central cross section of the air side of a microtubular solid oxidation fuel cell stack with uniform gas distribution in the embodiment (left) and a stack structure without adding a guide plate (right).

[0044] In the figure:

[0045] 10. Shell; 11. Fuel distributor; 12. Fuel outlet cavity; 13. Fluid cavity; 14. Air inlet; 15. Air outlet; 111. Fuel gas inlet; 112. Fuel cavity; 113. Arc plate; 114. Backflow prevention structure; 115. First gas port; 121. Connector; 122. Second gas port;

[0046] 20. Solid oxide fuel cell tube;

[0047] 30. guide plate; 31. guide portion; 32. connecting portion. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments, rather than all the embodiments.

[0049] Example 1

[0050] like Figure 1-4 As shown, a micro-tube solid oxide fuel cell stack with uniform gas distribution includes a housing 10 and a plurality of solid oxide fuel cell tubes 20.

[0051] Specifically, a fuel distributor 11 and a fuel outlet cavity 12 are respectively disposed at both ends of the housing 10, and a fluid cavity 13 is formed between the housing 10, the fuel distributor 11 and the fuel outlet cavity 12. A fuel gas inlet 111 and a fuel cavity 112 are disposed on the fuel distributor 11, and the fuel gas inlet 111 is communicated with the fuel cavity 112.

[0052] The fuel gas inlet 111 is made of tubular material, and a sealing gasket (not shown) is used between the fuel gas inlet 111 and the fuel distributor 11 to achieve sealing. The sealing gasket is made of silicon carbide ceramic material. Silicon carbide ceramic material has the characteristics of high hardness and high strength, and can withstand the high-speed impact of fuel gas and the test of high-temperature environment. Its good thermal conductivity helps to evenly dissipate heat during the sealing process and avoid the degradation of sealing material performance due to local overheating. Under long-term actual working conditions, the sealing gasket can maintain stable physical and chemical properties, ensure the sealing of the fuel cavity 112, and effectively prevent fuel gas leakage.

[0053] Specifically, two ends of the solid oxide fuel cell tube 20 are connected to the fuel distributor 11 and the fuel outlet cavity 12 respectively, and the solid oxide fuel cell tube 20 is not connected to the fluid cavity 13 .

[0054] Specifically, the two ends of the housing 10 are respectively provided with an air inlet 14 and an air outlet 15, and both the air inlet 14 and the air outlet 15 are connected to the fluid cavity 13. A plurality of air inlets 14 and air outlets 15 can be provided, and the number of air inlets 14 and air outlets 15 is set according to actual conditions.

[0055] Specifically, the solid oxide fuel cell tube 20 is disposed in the housing 10 , and a guide plate 30 is disposed on the solid oxide fuel cell tube 20 .

[0056] Specifically, a double-layer sealing structure (not shown) is provided between the housing 10 and the fuel distributor 11 to ensure the sealing between the housing 10 and the fuel distributor 11. A double-layer sealing structure (not shown) is adopted at the connection part between the housing 10 and the fuel distributor 11, the inner layer is filled with high-temperature sealant, and the outer layer is wrapped with a nickel-based alloy sealing sleeve to further enhance the sealing effect.

[0057] Specifically, there is a gap between adjacent solid oxide fuel cell tubes 20, and the central axis of the solid oxide fuel cell tube 20 is parallel to the central axis of the housing 10. There is a gap between adjacent tubes to ensure that air can flow through; each solid oxide fuel cell tube 20 is connected by a guide plate to achieve battery series connection; the solid oxide fuel cell tube 20 is connected to the fuel gas outlet cavity, and the two are tightly fitted through a sealing gasket (not shown) to form a closed cavity, and the sealing gasket is also made of silicon carbide ceramic material

[0058] Exemplarily, there are twenty solid oxide fuel cell tubes 20 , and the twenty solid oxide fuel cell tubes 20 are distributed in a rectangular array.

[0059] When in use, fuel gas enters from the fuel gas inlet 111 and is evenly distributed to the multiple solid oxide fuel cell tubes 20 by the fuel distributor 11. The fuel gas is then discharged from the multiple solid oxide fuel cell tubes 20 to the fuel outlet chamber 12 for subsequent processing.

[0060] The structure of the fuel distributor will be further described below with reference to the accompanying drawings.

[0061] like Figure 2 and 3 As shown, the fuel distributor 11 includes an arc plate 113 and an anti-backflow structure 114. After the fuel gas enters the fuel distributor, the fuel gas is evenly distributed through the arc plate 113; in this process, the anti-backflow structure serves to reduce the backflow.

[0062] The arc plate 113 is located behind the backflow prevention structure 114, and the arc plate 113 is fixedly connected to the backflow prevention structure 114; the backflow prevention structure is located behind the fuel gas inlet 111;

[0063] The arc plate 113 has a first gas port 115 , which is communicated with the fuel cavity 112 , and the head end of the solid oxide fuel cell tube 20 is connected to the first gas port 115 .

[0064] The fuel chamber 112 is formed between the arc plate 113 and the backflow prevention structure 114 .

[0065] The convex surface of the arc plate 113 is located in the fuel cavity 112 , and the concave surface of the arc plate 113 is located in the fluid cavity 13 .

[0066] During use, after the fuel gas enters the fuel distributor 11, it is evenly distributed to each solid oxide fuel cell tube 20 through the arc plate 113; during this process, the collision of the airflow and the arc plate 113 will cause some gas to flow back, and this part of the gas will be blocked by the anti-backflow structure 114, which can not only avoid the danger of fuel gas backflow and mixing with the outside air, but also prevent the occurrence of back mixing caused by gas reflux, thereby improving the performance and reliability of the fuel cell stack.

[0067] The arc plate 113 is made of cordierite ceramics, which has a low thermal expansion coefficient. This enables it to maintain good dimensional stability in a fuel cell stack environment with large temperature changes, preventing the orifice plate from deforming due to thermal expansion and contraction, which would affect the distribution of the fuel gas. The anti-backflow structure is made of nickel-based alloy, which has excellent high-temperature strength and corrosion resistance, ensuring the long-term stable operation of the structure.

[0068] The structure of the guide plate will be further described below with reference to the accompanying drawings.

[0069] like Figure 5 and 6 As shown, the guide plate 30 includes a guide portion 31 and a connection portion 32; a plurality of solid oxide fuel cell tubes 20 are connected via the connection portion 32. Each solid oxide fuel cell tube 20 is connected via the connection portion 32, so that the solid oxide fuel cell tubes 20 are connected in series.

[0070] The connecting portion 32 connects the solid oxide fuel cell tubes 20 to realize the series connection of the cells. The flow guide portion 31 guides the gas flow at the periphery of the connecting portion 32 to realize the return flow of the gas.

[0071] At least three guide plates 30 are provided, and the at least three guide plates 30 are distributed at intervals.

[0072] The guide plate 30 is used in the fluid cavity 13 to guide the gas flow, thereby reducing the dead zone of the flow in the fluid cavity 13 and improving the uniformity of the gas flow. In addition, the guide plate 30 can also guide the air to flow in multiple paths and periodically between the solid oxide fuel cell tubes 20, thereby enhancing the electrochemical reaction of the battery and improving the overall performance of the battery stack.

[0073] The structure of the fuel outlet cavity will be further described below with reference to the accompanying drawings.

[0074] like Figure 4 As shown, the fuel outlet cavity 12 is arranged in a funnel shape; a connector 121 is arranged in the fuel outlet cavity 12 , a second gas port 122 is arranged on the connector 121 , and the end of the solid oxide fuel cell tube 20 is connected to the second gas port 122 .

[0075] A sealing gasket (not shown) is provided between the end of the solid oxide fuel cell tube 20 and the second gas port 122. The solid oxide fuel cell tube 20 and the second gas port 122 are also sealed by a sealing gasket, and the two are tightly fitted through the sealing gasket, which is also made of silicon carbide ceramic material.

[0076] The effectiveness of the backflow prevention structure in the embodiment will be verified using computational fluid dynamics methods.

[0077] The model was established using SpaceClaim software. To simplify the calculation, only the inlet was simply modeled and a certain amount of equal-scale enlargement was performed to better demonstrate the structural effect. The model was imported into Fluent Meshing to divide the mesh, and the mesh was a combination of polyhedron and hexahedron. The divided mesh was imported into Fluent for numerical simulation.

[0078] Fuel gas velocity: V = 10m / s, using the turbulence equation k-ω model. Simulate and calculate the flow in the fuel gas flow field. The fuel gas inlet is the uniformly distributed velocity inlet boundary, the fuel gas outlet is the pressure outlet boundary, the outlet gauge pressure is 0Pa, and the operating pressure is 101325Pa.

[0079] The overall height of the model is 370mm, the width is 420mm, the inlet diameter is 80mm, the backflow prevention structure is 68mm high and 232mm wide; the porous arc orifice plate is 82mm high, 380mm wide and 5mm thick.

[0080] Available from Figure 7 It can be seen that the anti-backflow structure plays a role in guiding the gas flow. The anti-backflow structure is constructed based on the anti-backflow principle of the Tesla valve. By guiding the flow path of the backflow, the backflow branch and the backflow main flow collide to achieve the purpose of reducing the backflow. Figure 8 From the pressure distribution, it can be seen that compared with the original inlet without the anti-backflow structure, the internal pressure of the structure is significantly reduced after using the anti-backflow structure, which shows that its flow stability is stronger, the backflow is greatly reduced, and the loss caused by the backflow is greatly reduced.

[0081] The computational fluid dynamics method will be used below to verify the effect of the guide plate structure in the embodiment on improving flow uniformity.

[0082] By modeling an actual 100-watt 4×5 tubular fuel cell stack, the fluid flow characteristics are studied. To simplify the calculation, only the air side fluid domain of the fuel cell stack is extracted, and a certain proportional enlargement is performed to better demonstrate the structural effect. The model is built using SpaceClaim software and imported into Fluent Meshing to divide the mesh. The mesh is a combination of polyhedron and hexahedron. The divided mesh is imported into Fluent for numerical simulation.

[0083] Air velocity: V = 30m / s, using the turbulence equation k-ω model. Simulate and calculate the flow in the air flow field. The air inlet is a uniformly distributed velocity inlet boundary, the air outlet is a pressure outlet boundary, the outlet gauge pressure is 0Pa, and the operating pressure is 101325Pa.

[0084] The overall height of the model is 2000mm, the length × width is 400mm × 400mm, the inlet and outlet diameter is 50mm, the guide plate is 360mm long and 5mm thick.

[0085] Available from Fig. 9 It can be seen that the guide plate plays a role in guiding the gas flow. The guide plate guides the gas flow path to reduce the unevenness of the gas flow. Fig. 9 From the velocity distribution, it can be seen that compared with the fuel cell stack without adding guide plates, after using the guide plates, the low-speed area (dark blue area less than 1m / s) is significantly reduced, the velocity distribution of the fuel cell stack is more uniform, and it can be seen that the guide plates realize the periodic return flow of gas in the fuel cell stack.

[0086] The computational fluid dynamics method will be used below to verify the effect of the guide plate structure in the embodiment on reducing the temperature gradient.

[0087] By modeling an actual 100-watt 4×5 tube-type battery stack, the fluid flow characteristics and heat conduction characteristics are studied. To simplify the calculation, the battery tube bundle is simplified into a hollow tube, and the battery stack is enlarged to a certain extent to better demonstrate the structural effect. The model is built using SpaceClaim software and imported into Fluent Meshing to divide the mesh. The mesh is a combination of polyhedron and hexahedron. The divided mesh is imported into Fluent for numerical simulation.

[0088] Air velocity: V = 30m / s, using the turbulence equation k-ω model. Simulate and calculate the flow in the air flow field. The air inlet is a uniformly distributed velocity inlet boundary, the air outlet is a pressure outlet boundary, the outlet gauge pressure is 0Pa, the operating pressure is 101325Pa, and the temperature is set to 973K. Each tube is set with a heat source of 8.5W to simulate the actual battery heating.

[0089] The overall height of the model is 2000mm, the length × width is 400mm × 400mm, the inlet and outlet diameter is 50mm, the guide plate is 360mm long and 5mm thick. The outer diameter of the pipe is 30mm and the inner diameter is 20mm.

[0090] Available from Fig.10 It can be seen that the guide plate plays a role in reducing the temperature gradient of the battery tube bundle. Fig. 9 The comparison of temperature distribution shows that compared with the battery stack without the guide plate, after using the guide plate, the temperature gradient of each battery tube bundle is reduced (from the original 20K temperature gradient to 13K), and the temperature distribution is more uniform (the color is more uniform than the original battery stack).

[0091] Although the embodiments of the present application have been shown and described above, the scope of protection of the present invention is not limited thereto, and any changes or substitutions that are not conceivable through creative work should be included in the scope of protection of the present invention; unless explicitly stated, any elements, actions or instructions used in this document should not be interpreted as critical or necessary.

Claims

1. A micro-tubular solid oxidation fuel cell stack with uniform gas distribution, characterized in that: include: a housing and a plurality of solid oxide fuel cell tubes; A fuel distributor and a fuel outlet cavity are respectively disposed at two ends of the shell, and a fluid cavity is formed between the shell, the fuel distributor and the fuel outlet cavity; The fuel distributor is provided with a fuel gas inlet and a fuel cavity, and the fuel gas inlet is communicated with the fuel cavity; The two ends of the solid oxide fuel cell tube are respectively connected to the fuel distributor and the fuel outlet cavity, and the solid oxide fuel cell tube is not connected to the fluid cavity; At least one air inlet and at least one air outlet are respectively disposed at two ends of the housing, and the at least one air inlet and the at least one air outlet are both communicated with the fluid cavity; The solid oxide fuel cell tube is arranged in the housing, and a guide plate is arranged on the solid oxide fuel cell tube.

2. The micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to claim 1, characterized in that: The fuel distributor comprises: Curved plates and backflow prevention structures; The arc plate is used to achieve uniform distribution of fuel gas, the arc plate is located behind the anti-backflow structure, and the arc plate is fixedly connected to the anti-backflow structure; The anti-backflow structure is located behind the fuel gas inlet; The arc-shaped plate has a first gas port, the first gas port is communicated with the fuel cavity, and the head end of the solid oxide fuel cell tube is connected to the first gas port.

3. The micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to claim 1, characterized in that: The guide plate comprises: Guides and connections; The plurality of solid oxide fuel cell tubes are connected via the connecting portion.

4. The micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to claim 3, characterized in that: A double-layer sealing structure is arranged between the shell and the fuel distributor.

5. The micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to claim 1, characterized in that: At least three guide plates are provided, and at least three guide plates are distributed at intervals.

6. The micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to claim 2, characterized in that: The fuel outlet cavity is arranged in a funnel shape; A connector is arranged in the fuel outlet cavity, a second gas port is arranged on the connector, and the end of the solid oxide fuel cell tube is connected to the second gas port.

7. The micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to claim 6, characterized in that: A sealing gasket is provided between the end of the solid oxide fuel cell tube and the second gas port, and the solid oxide fuel cell tube and the second gas port are sealed by the sealing gasket.

8. The micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to claim 2, characterized in that: The fuel chamber is formed between the arc plate and the backflow prevention structure.

9. The micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to claim 2, characterized in that: The convex surface of the arc-shaped plate is located in the fuel cavity, and the concave surface of the arc-shaped plate is located in the fluid cavity.

10. The micro-tubular solid oxidation fuel cell stack with uniform gas distribution according to claim 1, characterized in that: There is a gap between adjacent solid oxide fuel cell tubes; The central axis of the solid oxide fuel cell tube is parallel to the central axis of the shell.

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