CN110350229B

CN110350229B - Modularized solid oxide fuel cell stack

Info

Publication number: CN110350229B
Application number: CN201910662798.9A
Authority: CN
Inventors: 李箭; 杨佳军; 王傲; 颜冬; 贾礼超; 蒲健; 池波
Original assignee: Wuhan Huake Fuelcell New Energy Co ltd
Current assignee: Wuhan Huake Fuelcell New Energy Co ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2020-09-25
Anticipated expiration: 2039-07-22
Also published as: CN110350229A

Abstract

The invention relates to a modularized solid oxide fuel cell stack, wherein a stack module comprises a support frame, a stack core, a fuel distribution pipe, a fuel air outlet cavity, an air flow cavity and a fastening bolt. The support frame provides structural support for the entire module; the fuel distribution pipe is positioned in the center of the support frame and plays a role in uniformly distributing fuel airflow; a plurality of reactor cores are integrated at symmetrical positions of the support frame; the air flow cavity is positioned between two adjacent reactor cores, comprises two independent cavities and is respectively used as a reactor air inlet flow cavity and an air outlet flow cavity; the fastening bolt is used for fixing each airflow cavity. The invention has compact structure, reduces the number of the assembled parts of the electric pile, reduces the volume of the whole module under the condition of ensuring the uniform distribution of air flow, and can realize high-power output by the expansion of the module and the assembly of a plurality of modules.

Description

Modularized solid oxide fuel cell stack

Technical Field

The invention relates to the field of fuel cells, in particular to a modularized solid oxide fuel cell stack.

Background

The solid oxide fuel cell has the advantages of high energy conversion efficiency, environmental protection and the like. The theoretical open circuit voltage of a large-area flat-plate type solid oxide fuel cell unit cell is only about 1.2V at the working temperature, the rated output power is usually lower than 100W, in order to improve the output voltage and power, a plurality of unit cells are usually connected in series by using a metal connector to form a stack, and the metal connector plays the role of a lead in the stack. To separate fuel gas from air, a sealing material is filled between the cell and the connector. As the number of cells increases within the stack, the length of the sealing area increases, and the likelihood of gas leakage within the stack increases, which severely affects the long-term stability of the stack. In addition, the increased number of cells also affects the uniformity of stress and airflow distribution within the stack, which can negatively impact the performance of the stack. Compared with a long stack, the short stack power density is higher, the stability is better, and the power of the system is improved by adopting a series or parallel connection mode of short stacks (hundreds of watts-kilowatt level) in a large commercial solid oxide fuel cell power station.

The galvanic pile modules connected in a straight line lead to overlong whole galvanic pile heat box, the gas transmission distance is increased along with the overlong whole galvanic pile heat box, the heat efficiency of the whole system is low, and the temperature fields around each galvanic pile are not uniformly distributed. Along with the increase of the number of the galvanic piles, the concentration of the gas reaching the downstream galvanic piles is reduced, the condition of insufficient gas supply is easy to occur, and the temperature of the whole system is not easy to control. The existing design that the galvanic pile is arranged in the heat boxes with a plurality of centrosymmetry is adopted, the distribution of the galvanic pile gas is completed at the periphery of the heat box, each galvanic pile is connected through a pipeline, the space utilization rate is low, the pipeline is difficult to insulate heat, and the independent design of the galvanic pile heat box enables the processing cost to be high.

Disclosure of Invention

The invention provides a modularized solid oxide fuel cell stack, which aims at the technical problems in the prior art, relates to the modularized solid oxide fuel cell stack integration technology, is suitable for an integration method of a plurality of solid oxide fuel cell stacks with outflow cavities, and can solve the problems in the existing stack integration aspect.

The technical scheme for solving the technical problems is as follows:

a modularized solid oxide fuel cell electric pile comprises a supporting frame, a plurality of air flow cavities, a plurality of electric pile reactor cores, a plurality of fuel outlet flow cavities and fuel distribution pipes, wherein the supporting frame comprises a top plate, a middle frame and a bottom plate which are fixedly connected in sequence, the middle frame is in a regular rhombus column shape, each electric pile reactor core is respectively and vertically arranged on one side surface of the middle frame, each air flow cavity is arranged between the adjacent electric pile reactor cores at intervals, a plurality of through holes are formed in the side surface, close to the electric pile reactor cores, of each air flow cavity, a shell of each air flow cavity and the electric pile reactor cores are fixedly arranged on the bottom plate, and the air flow cavities, the electric pile reactor cores and the supporting frame are connected in a sealing mode; an air inlet and an air outlet are arranged on the shell of the air flow cavity; the shell of the fuel gas outlet cavity is arranged on the bottom plate and is hermetically connected with one side, far away from the middle frame, of the reactor core of the electric reactor, and a residual fuel gas outlet is formed in the fuel gas outlet cavity; the fuel distribution pipe is arranged in the middle frame, and the bottom of the fuel distribution pipe penetrates through the bottom plate to be communicated with the outside.

In the working process, preheated fuel gas flows in from the bottom of the fuel distribution pipe and flows into the reactor core through the middle frame of the support frame, preheated air flows into the reactor core from the air inlet of the air flow cavity, after the reaction of the fuel gas and compressed air at the reactor core is completed, reaction residual fuel gas flows to the next procedure through a residual fuel gas outlet on the fuel gas outlet flow cavity, the reaction residual air flows to the next procedure through an air outlet of the air flow cavity, and the support frame provides support for the whole reactor module. According to the technical scheme, the airflow cavity inside the airflow cavity is hermetically connected with the reactor core of the electric reactor, the preheated fuel gas of the fuel distribution pipe passes through the middle frame and directly enters the reaction area of the reactor core of the electric reactor, the middle pipeline connection part is omitted, and the volume of the electric reactor module is greatly reduced while the output power is ensured. Each electric pile in the module is uniformly distributed in a divergence mode relative to the center of the module, so that the uniformity of the flow of gas introduced into the reactor core of each electric pile is ensured; the uniformity of the temperature in the module is ensured by the modularized symmetrical design; the compact sealing design reduces the heat dissipation and improves the overall efficiency of the system; the accumulation of the individual modules can achieve a high power output.

Preferably, the top of the fuel distribution pipe is arranged in a sealing manner, and the pipe wall of the fuel distribution pipe, which is positioned in the middle frame, is provided with a plurality of fuel gas distribution holes which are uniformly distributed. The top of the fuel distribution pipe is sealed, and the pipe wall is provided with a plurality of uniformly distributed fuel gas distribution holes, so that preheated fuel gas uniformly flows to a plurality of symmetrically arranged reactor cores through the fuel gas distribution holes after entering the fuel distribution pipe, the reactor cores of the reactors are balanced in reaction, and the reaction temperature in the module is uniform.

Preferably, the electric pile core is formed by connecting a plurality of cells and a connecting body in series. And arranging a plurality of battery pieces connected in series according to actual needs to increase output power. And the plurality of batteries are arranged in a layered manner, so that the batteries can be in more sufficient contact with gas to be reacted and air, and the reaction efficiency is improved.

Preferably, the housing of the air flow cavity is a hollow mitsubishi cylinder, a longitudinal partition plate is arranged in the air flow cavity, the air flow cavity is divided into an air inlet flow cavity and an air outlet flow cavity by the partition plate, an air inlet is communicated with the air inlet flow cavity, and an air outlet is communicated with the air outlet flow cavity. The air flow cavity is internally provided with an independent air inlet flow cavity and an independent air outlet flow cavity, so that preheated air is prevented from directly flowing out of an air outlet without flowing into a reactor core from an air inlet, the material utilization rate and the reaction efficiency are reduced, and the reaction efficiency of the whole point pair module is influenced. After the independent air inflow cavity and the air outflow cavity are arranged, preheated air flows into the air inflow cavity, then flows through the reactor core, flows into the air outflow cavity of the other adjacent air inflow cavity after reaction, and then flows out to the next procedure through the air outlet connected with the air outflow cavity, so that the material utilization rate and the reaction efficiency are greatly improved. The air inlet flow cavity and the air outlet flow cavity are adjacent, air preheated by the peripheral heat exchanger can further exchange heat with high-temperature gas after the reaction is finished, and the heat efficiency of the system is improved.

Preferably, the bottom plate is provided with a plurality of longitudinal through holes, and the air inlet, the air outlet and the fuel distribution pipe respectively penetrate through the through holes. The air inlet and the air outlet are uniformly arranged on the bottom plate, and the volume of the whole module can be reduced by centralized arrangement.

Preferably, the top of the housing of the airflow chamber is fixedly connected with the top plate of the support frame through a connecting piece, and the bottom of the housing of the airflow chamber is fixedly connected with the bottom plate of the support frame through a connecting piece. The top plate of the supporting frame and the bottom plate of the supporting frame provide effective support and fixation for the air flow cavity, and the air flow cavity is prevented from shifting due to the difference of the internal air pressure and the external air pressure of the modules in the reaction process, so that the airtightness between the air flow cavity and the reactor core of the electric pile is influenced, and energy dissipation is caused.

Preferably, a concave platform is arranged on one surface of the shell of the fuel gas outlet cavity facing the reactor core, the concave platform and the reactor core form the fuel gas outlet cavity, and a residual fuel gas outlet penetrating through the shell of the fuel gas outlet cavity is arranged on the concave platform. In the reactor core of the electric reactor, after the gas among the multi-layer cells is reacted, the reaction residual air flows to the air outlet flow cavity through the reactor core of the electric reactor, and the residual fuel gas is collected in the fuel outlet flow cavity and then flows out of the electric reactor module through the residual fuel gas outlet.

Preferably, the top of the housing of the fuel gas outlet cavity is fixedly connected with the top plate of the support frame through a connecting piece, and the bottom of the housing of the fuel gas outlet cavity is fixedly connected with the bottom plate of the support frame through a connecting piece. The top plate of the supporting frame and the bottom plate of the supporting frame provide effective support and fixation for the fuel gas outlet cavity, and gas leakage caused by the difference of the internal pressure and the external pressure of the module in the reaction process is prevented.

Preferably, the support frame is made of high temperature stainless steel. Because the supporting frame is in a high-temperature environment and is in contact with preheated air, oxygen in the hot air has strong oxidizability and is easy to corrode the supporting frame. The problems can be solved by selecting high-temperature stainless steel with deformation resistance and strong corrosion resistance.

The invention has the beneficial effects that:

the invention adopts the airflow chamber in the airflow chamber to be hermetically connected with the reactor core of the electric reactor, and the preheated fuel gas of the fuel distribution pipe passes through the middle frame to directly enter the reaction area of the reactor core of the electric reactor, thereby omitting the middle pipeline connection part, ensuring the output power and greatly reducing the volume of the electric reactor module. The air inlet flow cavity and the air outlet flow cavity are adjacent, and the preheated air can further exchange heat with high-temperature gas after the reaction is finished, so that the heat efficiency of the system is improved; the reactor cores of the electric reactors in the module are uniformly distributed in a divergence mode relative to the center of the module, so that the uniformity of the flow of gas introduced into the reactor cores of the electric reactors is ensured; the uniformity of the temperature in the module is ensured by the modularized symmetrical design; the compact sealing design reduces the heat dissipation and improves the overall efficiency of the system; the accumulation of the individual modules can achieve a high power output.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention 1;

FIG. 3 is a schematic view of the internal structure of the present invention 2;

FIG. 4 is a schematic view of a fuel rail configuration of the present invention;

FIG. 5 is a schematic view of the air flow chamber of the present invention;

FIG. 6 is a schematic diagram of a fuel outlet flow chamber according to the present invention;

FIG. 7 is a schematic view of a reactor core of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the fuel gas distribution device comprises a supporting frame, 101, a top plate, 102, a middle frame, 103, a bottom plate, 1031, a through hole, 1032, a boss, 2, an air flow cavity, 201, an air inlet flow cavity, 202, an air outlet flow cavity, 203, an air inlet, 204, an air outlet, 3, a reactor core, 4, a fuel outlet flow cavity, 401, a residual fuel gas outlet, 402, a concave platform, 5, a fuel distribution pipe, 501, a fuel gas distribution hole, 6, a first fastening bolt, 7, a second fastening bolt, 8 and a third fastening bolt.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 to 3, a modularized solid oxide fuel cell stack comprises a support frame 1, three air flow chambers 2, three stack cores 3, three fuel outlet flow chambers 4, and fuel distribution pipes 5, wherein the support frame 1 comprises a top plate 101, a middle frame 102, and a bottom plate 103, which are fixedly connected in sequence, each side of the middle frame 102 is hollowed out, the top plate 101 is parallel to the bottom plate 103, and the edge of the bottom plate 103 extends outwards and transversely. The middle frame 102 is in a regular triangular prism shape, the reactor cores 3 are in a cuboid structure, each reactor core 3 is respectively perpendicular to one side face of the middle frame 102, and the two side faces of the reactor cores 3, which are in mutual contact with the middle frame 102, are the same in shape and size. The shell of the air flow cavities 2 is in a shape of a rhomboid column, each air flow cavity 2 is arranged between adjacent reactor cores 3 at intervals, and a plurality of through holes are formed in the side surfaces, close to the reactor cores 3, of the air flow cavities 2. The housing of the airflow cavity 2 and the reactor core 3 are fixedly mounted on the bottom plate 103, and the airflow cavity 2, the reactor core 3 and the support frame 1 are hermetically connected through a sealing material; the bottom of the shell of the air flow chamber 2 is provided with an air inlet 203 and an air outlet 204, and the air inlet 203 and the air outlet 204 penetrate through the bottom plate 103; the outer shell of the fuel gas outlet cavity 4 is vertically installed on the bottom plate 103, the outer shell of the fuel gas outlet cavity 4 is hermetically connected with one side, far away from the middle frame 102, of the reactor core 3, and a residual fuel gas outlet 401 is formed in the outer shell of the fuel gas outlet cavity 4; the fuel distribution pipe 5 is installed in the middle frame 102, and the bottom of the fuel distribution pipe 5 is communicated with the outside through the bottom plate 103.

In the working process, preheated fuel gas flows in from the bottom of the fuel distribution pipe 5 and flows into the reactor core 3 through the space inside the middle frame 102 of the support frame 1, preheated air flows in the reactor core 3 from the air inlet 203 of the air flow cavity 2, after the reaction of the fuel gas and the air at the reactor core 3 is completed, reaction residual fuel gas flows to the next process through a residual fuel gas outlet 401 on the fuel gas outlet flow cavity 4, and the reaction residual air flows to the next process through an air outlet 204 of the air flow cavity 2, and the support frame 1 provides support for the whole reactor module. The embodiment utilizes the airflow cavity formed in the airflow cavity 2 to be closely connected with the reactor core 3, and the preheated fuel gas of the fuel distribution pipe 5 passes through the middle frame 102 to directly enter the reaction area of the reactor core 3, so that the middle pipeline connecting part in the prior art is omitted, and the volume of the reactor module is greatly reduced while the output power is ensured. Each electric pile in the module is uniformly distributed in a divergence mode relative to the center of the module, so that the uniformity of the flow of gas introduced into the reactor core of each electric pile is ensured; the uniformity of the temperature in the module is ensured by the modularized symmetrical design; the compact sealing design reduces the heat dissipation and improves the overall efficiency of the system; the accumulation of multiple modules can achieve high power output.

As shown in fig. 4, the top of the fuel distribution pipe 5 is hermetically disposed, and a plurality of gas distribution holes 501 are formed in a pipe wall of the fuel distribution pipe 5 located in the middle frame 102, and the plurality of gas distribution holes 501 are uniformly distributed. The top of the fuel distribution pipe 5 is sealed, and the pipe wall is provided with a plurality of uniformly distributed fuel gas distribution holes 501, so that preheated fuel gas uniformly flows to a plurality of anode runners inside the symmetrically arranged reactor core 3 through the fuel gas distribution holes 501 to perform electrochemical reaction after entering the fuel distribution pipe 5, the reaction of the reactor core 3 is balanced, and the reaction temperature in the module is uniform.

In this embodiment, the reactor core 3 of the electric pile is formed by connecting a plurality of batteries in series with a connector, and the series connection of the plurality of batteries is the prior art and is not described herein again. And arranging a plurality of battery pieces connected in series according to actual needs to increase output power. The whole reactor core 3 of the electric reactor is arranged in a cuboid shape (the whole shape of the reactor core 3 of the electric reactor is shown in figure 7), and the plurality of batteries are arranged in a layered mode, so that the batteries can be in more sufficient contact with gas to be reacted and air, and the reaction efficiency is improved.

In this embodiment, the housing of the air flow chamber 2 is a hollow mitsubishi cylinder, an included angle between two side surfaces of the air flow chamber 2 close to the reactor core 3 is 120 °, the two side surfaces are provided with a plurality of uniformly arranged vent holes, a longitudinal partition plate is arranged in the air flow chamber 2, the partition plate uniformly partitions the air flow chamber 2 into an air inlet flow chamber 201 and an air outlet flow chamber 202, the air inlet 203 is communicated with the air inlet flow chamber 201, and the air outlet 204 is communicated with the air outlet flow chamber 202. The air flow chamber 2 is internally provided with an independent air inlet flow chamber 201 and an independent air outlet flow chamber 202 which are used for inputting preheated air and outputting unreacted air for two adjacent electric reactors respectively, so that the preheated air is prevented from flowing into the reactor core 3 from the air inlet 203 and directly flowing out from the air outlet 204, the material utilization rate and the reaction efficiency are reduced, and the reaction efficiency of the whole point pair module is influenced. After the independent air inflow cavity 201 and the independent air outflow cavity 202 are arranged, preheated air flows into the air inflow cavity 201, then flows through the reactor core 3, flows into the air outflow cavity 202 of the other adjacent air outflow cavity 2 after reaction, and then flows out to the next process through the air outlet 204 connected with the air outflow cavity, so that the material utilization rate and the reaction efficiency are greatly improved.

As shown in fig. 3, a plurality of longitudinal through holes 1031 are provided on the bottom plate 103, and the air inlet 203, the air outlet 204, and the fuel distribution pipe 5 respectively pass through the through holes 1031. The air inlet and the air outlet are uniformly arranged on the bottom plate 103, and the volume of the whole electric pile module can be reduced by centralized arrangement, and the interference between other devices can also be reduced.

In this embodiment, the top of the housing of the airflow chamber 2 is fixedly connected to the top plate 101 of the support frame 1 through a connector, and the bottom of the housing of the airflow chamber 2 is fixedly connected to the bottom plate 103 of the support frame 1 through a connector. In this embodiment, the bottom plate 103 is configured as a regular hexagon, a circle of boss 1032 is disposed at the edge of the bottom plate 103, each edge of the regular hexagon boss 1032 has a plurality of threaded holes therethrough, and a plurality of third fastening bolts 8 pass through the threaded holes to fixedly connect the bottom of the air flow cavity 2 with the regular hexagon boss 1032. The pressure exerted by the third tightening bolt 8 is the interaction force formed between the outer wall of the airflow chamber 2 and the regular hexagonal boss 1032 during rotation of the screw. As shown in fig. 5, the top of the housing of each airflow chamber 2 is provided with a longitudinal mounting plate, which is provided with through holes; as shown in fig. 1, a plurality of mounting bars parallel to each side of the regular hexagonal boss 1032 are disposed on the top plate 101 of the supporting frame 1, each mounting bar is provided with a through hole, and the second fastening bolt 7 passes through the through hole to fixedly connect the top of the housing of the airflow cavity 2 with the top plate 101 of the supporting frame 1. The top plate 101 of the support frame 1 and the bottom plate 103 of the support frame 1 provide effective support and fixation for the housing of the air flow cavity 2, and prevent the displacement of the housing of the air flow cavity 2 caused by the difference between the internal air pressure and the external air pressure of the module in the reaction process, thereby influencing the tightness between the air flow cavity and the reactor core 3 and causing energy dissipation.

In the present embodiment, as shown in fig. 6, a concave 402 is provided on a surface of the fuel outlet cavity 4 facing the reactor core 3, the concave 402 and the reactor core 3 constitute the fuel outlet cavity 4, and the concave 402 is provided with a residual fuel gas outlet 401 penetrating through a casing of the fuel outlet cavity 4. After the gas between the multiple layers of cells in the reactor core 3 is reacted, the reaction residual air flows to the air outlet flow cavity 202 through the reactor core 3, and the residual fuel gas is collected in the fuel outlet flow cavity and then flows out of the reactor module through the residual fuel gas outlet 401.

In this embodiment, the top of the housing of the fuel outlet flow chamber 4 is fixedly connected to the top plate 101 of the support frame 1 through a connecting member, and the bottom of the housing of the fuel outlet flow chamber 4 is fixedly connected to the bottom plate 103 of the support frame 1 through a connecting member. In this embodiment, the bottom plate 103 is arranged in a regular hexagon, a circle of boss 1032 is arranged at the edge of the bottom plate 103, each edge of the regular hexagon boss 1032 has a plurality of threaded holes therethrough, and a plurality of third fastening bolts 8 pass through the threaded holes to fixedly connect the bottom of the housing of the fuel outlet flow cavity 4 with the regular hexagon boss 1032. The pressure applied by the third fastening bolt 8 is the interaction force formed between the outer wall of the fuel outlet flow chamber 4 and the regular hexagonal boss 1032 during rotation of the screw. The top of the outer shell of each fuel gas outlet flow cavity 4 is provided with a longitudinal mounting plate, the mounting plate is provided with a through hole, the top plate 101 of the support frame 1 is provided with a plurality of mounting strips parallel to each edge of the regular hexagon boss 1032, each mounting strip is provided with a through hole, and the first fastening bolt 6 penetrates through the through hole to fixedly connect the top of the outer shell of the fuel gas outlet flow cavity 4 with the top plate 101 of the support frame 1. The top plate 101 of the support frame 1 and the bottom plate 103 of the support frame 1 provide effective support and fixation for the housing of the fuel outlet cavity 4, and prevent displacement of the housing of the fuel outlet cavity 4 caused by the difference between the internal and external pressures of the modules in the reaction process, thereby affecting the tightness between the fuel outlet cavity 4 and the reactor core 3 and causing energy dissipation.

The first and

second fastening bolts

6 and 7 are preferably made of a high-temperature low-expansion alloy, and the third fastening bolt 8 is preferably made of a high-temperature high-expansion alloy.

In this embodiment, the support frame 1 is made of high temperature stainless steel, such as 310S stainless steel. Because the supporting frame 1 is in a high-temperature environment and is in contact with the preheated air, oxygen in the hot air has strong oxidizing property and is easy to corrode the supporting frame 1. The problems can be solved by selecting high-temperature stainless steel with deformation resistance and strong corrosion resistance.

The number of the reactor cores 3 of the electric reactor can be three, four, five, six and the like according to actual needs, the number of the corresponding air flow cavities 2 is equal to that of the reactor cores 3, and the number of the corresponding edges of the bottom surface of the middle frame 102 is equal to that of the reactor cores 3. Assuming that the angle a between the two sides of each air flow chamber 2 facing the intermediate frame 102 is equal to 360 °, the angles a of all the air flow chambers 2 are added.

The system fuel is preheated and then is introduced into the fuel distribution pipe 5, and is uniformly distributed into the three reactor cores 3 for electrochemical reaction, and the electric energy generated by the reaction is led out by the anode and the cathode of the reactor cores 3. The unreacted fuel gas enters a fuel gas outlet cavity formed by the concave platform 402 and the reactor core 3 of the electric reactor, and is conveyed to a peripheral system combustion chamber through a residual fuel gas outlet 401. The air preheating of the system is similar to the process, except that the air inlet flow cavity 201 and the air outlet flow cavity 202 are adjacent, the air preheated by the peripheral heat exchanger can further exchange heat with the high-temperature gas after the reaction is finished, and the heat efficiency of the system is improved.

Two airflow chambers inside the airflow chamber 2 are hermetically connected with the reactor core 3, and the preheated fuel gas of the fuel distribution pipe 5 passes through the middle frame 102 and directly enters the reaction area of the reactor core 3, so that a middle pipeline connection part is omitted, and the volume of the reactor module is greatly reduced while the output power is ensured. The reactor cores 3 of the electric reactors in the module are uniformly distributed in a divergence mode relative to the center of the module, so that the uniformity of the flow of gas introduced into the reactor cores 3 of the electric reactors is ensured; the uniformity of the temperature in the module is ensured by the modularized symmetrical design; the compact sealing design reduces the heat dissipation and improves the overall efficiency of the system; the accumulation of the individual modules can achieve a high power output.

The pressurization of the upper portion of the reactor core 3 is not discussed in the present invention.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A modularized solid oxide fuel cell electric pile is characterized by comprising a supporting frame (1), a plurality of air flow cavities (2), a plurality of electric pile cores (3), a plurality of fuel outlet flow cavities (4) and a fuel distribution pipe (5), wherein the supporting frame (1) comprises a top plate (101), a middle frame (102) and a bottom plate (103) which are fixedly connected in sequence, the middle frame (102) is in a regular rhombus column shape, each electric pile core (3) is respectively arranged perpendicular to one side surface of the middle frame (102), each air flow cavity (2) is arranged between the adjacent electric pile cores (3), a plurality of through holes are formed in the side surface of each air flow cavity (2) close to the electric pile cores (3), and the shells of the air flow cavities (2) and the electric pile cores (3) are fixedly installed on the bottom plate (103), the air flow cavity (2), the reactor core (3) and the support frame (1) are hermetically connected; the shell of the air flow cavity (2) is a hollow rhombus cylinder, a longitudinal partition plate is arranged in the air flow cavity (2), the partition plate divides the air flow cavity (2) into an air inlet flow cavity (201) and an air outlet flow cavity (202), the air inlet (203) is communicated with the air inlet flow cavity (201), and the air outlet (204) is communicated with the air outlet flow cavity (202); an air inlet (203) and an air outlet (204) are arranged on the shell of the air flow cavity (2); the shell of the fuel gas outlet cavity (4) is installed on the bottom plate (103) and is hermetically connected with one side, far away from the middle frame (102), of the reactor core (3), and a residual fuel gas outlet (401) is formed in the fuel gas outlet cavity (4); the fuel distribution pipe (5) is installed in the middle frame (102), and the bottom of the fuel distribution pipe (5) passes through the bottom plate (103) to be communicated with the outside.

2. The modular solid oxide fuel cell stack as claimed in claim 1, wherein the top of the fuel distribution pipe (5) is sealed, and the wall of the fuel distribution pipe (5) in the middle frame (102) is provided with a plurality of gas distribution holes (501), and the plurality of gas distribution holes (501) are uniformly distributed.

3. The modular solid oxide fuel cell stack of claim 1, wherein the bottom plate (103) is provided with a plurality of longitudinal through holes (1031), and the air inlet (203), the air outlet (204) and the fuel distribution pipe (5) respectively pass through the through holes (1031).

4. The modular solid oxide fuel cell stack of claim 1, wherein the top of the housing of the air flow chamber (2) is fixedly connected to the top plate (101) of the support frame (1) by a connector, and the bottom of the housing of the air flow chamber (2) is fixedly connected to the bottom plate (103) of the support frame (1) by a connector.

5. The modular solid oxide fuel cell stack as claimed in claim 1, wherein a concave platform (402) is provided on a surface of the outer shell of the fuel outlet flow cavity (4) facing the stack core (3), the concave platform (402) and the stack core (3) form the fuel outlet flow cavity, and a residual fuel gas outlet (401) penetrating through the outer shell of the fuel outlet flow cavity (4) is provided on the concave platform (402).

6. The modular solid oxide fuel cell stack of claim 1, wherein the top of the housing of the fuel outlet chamber (4) is fixedly connected with the top plate (101) of the support frame (1) by a connector, and the bottom of the housing of the fuel outlet chamber (4) is fixedly connected with the bottom plate (103) of the support frame (1) by a connector.

7. The modular solid oxide fuel cell stack of claim 1, wherein the support frame (1) is made of high temperature stainless steel.