SOFC anode stack double-stack parallel module

Abstract

The utility model discloses a solid oxide fuel cell (SOFC) anode stack double-stack parallel module, which belongs to the technical field of fuel cells and comprises a gas distribution bottom plate, two groups of pressurizing bolts are arranged on the gas distribution bottom plate in a penetrating manner, and an electric stack is arranged between each group of pressurizing bolts; a guide pressing plate is arranged on the upper surface of the electric pile, a pressurizing plate is arranged above the guide pressing plate, and a spring group is arranged between the pressurizing plate and the guide pressing plate; the pressurizing bolt is in threaded connection with a nut after penetrating through the pressurizing plate; two groups of air holes are formed in the upper surface of the gas distribution bottom plate, the same air holes in the two groups of air holes are connected through corresponding flow channels in the gas distribution bottom plate, and the flow channels are connected with corresponding pipelines at the bottom of the gas distribution bottom plate through corresponding transfer flow channels in the gas distribution bottom plate; the joint of the transfer runner and the runner is located at the middle line of the runner. A plurality of flow channels are arranged in the gas distribution bottom plate and are respectively connected with two groups of gas holes, and a corresponding transfer flow channel is connected in the middle of each flow channel, so that the transfer flow channels are connected with corresponding pipelines, and gas can enter the two groups of gas holes after being uniformly distributed in the flow channels, thereby realizing parallel connection of double galvanic piles.

Description

Technical Field

[0001] This utility model belongs to the field of fuel cell technology, specifically relating to a dual-stacking parallel module of SOFC anode stack. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Solid oxide fuel cells (SOFCs) are a new type of power generation device that is highly efficient and low-pollution. A single stack is the basic unit of a solid oxide fuel cell.

[0004] In the prior art, such as the ignition point battery stack and fuel cell system disclosed in patent CN117117278A, the fuel cell stack includes fuel cell stacks arranged in sequence, and a conductive connection component is provided between two adjacent fuel cell stacks, and the two adjacent fuel cell stacks are electrically connected through the conductive connection component.

[0005] The above scheme has the following problems: the fuel cell stacks are arranged in series, and if one fuel cell stack fails, the entire system may fail, affecting reliability. Utility Model Content

[0006] To address the aforementioned issues, this invention provides a parallel dual-stacking SOFC anode module. Two fuel cells are mounted on a gas distribution base plate, with multiple flow channels connecting to two sets of gas holes. A corresponding transfer channel is connected to the middle of each flow channel, and this transfer channel is connected to a corresponding pipe. This allows the gas to be evenly distributed within the flow channels before entering the two sets of gas holes, achieving parallel operation of the dual fuel cells and preventing the entire module from failing if one fuel cell fails.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A parallel module for dual SOFC anode stacks includes a gas distribution base plate with two sets of pressure bolts passing through it. An electric stack is placed in the rectangular space enclosed between each set of pressure bolts. A guide plate is placed on the upper surface of the electric stack, and a pressure plate is placed above the guide plate. A spring assembly is placed between the pressure plate and the guide plate. The pressure bolts are threaded onto the pressure plate and connected to nuts.

[0009] The upper surface of the gas distribution base plate is provided with two sets of air holes. Each set of air holes includes an air inlet, a fuel inlet, an air outlet, and a fuel outlet. Identical air holes in the two sets of air holes are connected by corresponding flow channels inside the gas distribution base plate. The flow channels are connected to corresponding pipes at the bottom of the gas distribution base plate through corresponding transfer flow channels inside the gas distribution base plate. The connection between the transfer flow channels and the flow channels is located at the center line of the flow channels.

[0010] Preferably, the gas distribution base plate is provided with two sets of threaded holes, and the pressure bolt passes through the threaded holes and is threadedly connected to them. One end of the pressure bolt is fixedly provided with a bolt head, and the diameter of the bolt head is larger than that of the threaded hole.

[0011] Preferably, multiple insulating sleeves are provided on the pressure bolt. The insulating sleeves are square, and the top of the top insulating sleeve is located at the top of the guide pressure plate. The guide pressure plate needs to be engaged between the insulating sleeves on at least two sides.

[0012] Preferably, a plurality of guide posts are uniformly arranged on the top of the guide plate, and the guide posts are distributed in an array on the top of the guide plate.

[0013] Preferably, the guide plate is connected to the pressure plate via the guide post. Specifically, the pressure plate is provided with a number of guide holes equal to the number of guide posts, and the positions of the guide holes match the positions of the guide posts. The spring assembly includes a number of springs equal to the number of guide posts, with each spring sleeved on a guide post.

[0014] Preferably, the pressure plate is provided with several through holes, and the screw of the pressure bolt passes through the through holes and is threaded to the nut; the bottom of the air distribution base plate is set on the base by a bracket, and the base is used to fix it to the ground or workbench.

[0015] Preferably, the gas distribution base plate is provided with flow channels, namely an air inlet flow channel, a gas inlet flow channel, an air outlet flow channel, and a gas outlet flow channel; the two ends of the air inlet flow channel are connected to air inlet holes, the two ends of the gas inlet flow channel are connected to gas inlet holes, the two ends of the air outlet flow channel are connected to air outlet holes, and the two ends of the gas outlet flow channel are connected to gas outlet holes.

[0016] Preferably, the corresponding pipes installed at the bottom of the gas distribution base plate include an air intake pipe, a gas intake pipe, an air outlet pipe, and a gas outlet pipe.

[0017] Preferably, the corresponding transfer channels include an air intake transfer channel, a gas intake transfer channel, an air outlet transfer channel, and a gas outlet transfer channel.

[0018] Preferably, a set of vents is also provided on the bottom surface of the fuel cell stack, and the position, function, and size of this set of vents on the bottom surface of the fuel cell stack are consistent with each set of vents on the gas distribution base plate.

[0019] Compared with the prior art, the advantages and positive effects of this utility model are:

[0020] This invention achieves parallel operation of two fuel cells by setting two sets of air holes on the gas distribution base plate, with each set corresponding to a set of air holes at the bottom of one of the two fuel cell stacks on the gas distribution base plate. Multiple flow channels are set in the gas distribution base plate to connect the two sets of air holes, and a corresponding transfer flow channel is connected in the middle of each flow channel. The transfer flow channel is connected to the corresponding pipe, so that the gas can be evenly distributed in the flow channel and then enter the two sets of air holes. This enables the parallel operation of two fuel cell stacks and prevents the entire module from failing when one fuel cell stack fails. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0022] Figure 1 This is a schematic diagram of the structure of the dual-stacking parallel module according to an embodiment of the present invention;

[0023] Figure 2 This is a front view of the dual-stacking parallel module according to an embodiment of the present invention;

[0024] Figure 3 This is an internal schematic diagram of the air distribution base plate according to an embodiment of the present utility model;

[0025] Figure 4 This is a top view of the air distribution base plate according to an embodiment of the present utility model;

[0026] In the picture:

[0027] 1. Pressure plate; 2. Spring assembly; 3. Guide plate; 31. Guide post; 4. Fuel cell stack; 5. Gas distribution base plate; 51. Threaded hole; 52. Flow channel; 521. Air intake channel; 522. Gas intake channel; 523. Air outlet channel; 524. Gas outlet channel; 53. Pipe; 531. Air intake pipe; 532. Gas intake pipe; 533. Air outlet pipe; 534. Gas 54. Gas outlet pipe; 541. Transfer channel; 542. Gas inlet transfer channel; 543. Air outlet transfer channel; 544. Gas outlet transfer channel; 55. Gas port; 551. Air inlet port; 552. Gas inlet port; 553. Air outlet port; 554. Gas outlet port; 6. Base; 7. Pressure bolt; 71. Nut; 8. Insulating sleeve; 9. Bracket. Detailed Implementation

[0028] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0029] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a dual-reactor parallel module for SOFC anode stacks, as shown below. Figure 1 , Figure 2 As shown, the device includes a gas distribution base plate 5, on which two sets of pressure bolts 7 are threaded. An electric fuel cell stack 4 is positioned between each set of pressure bolts 7. A guide plate 3 is positioned on the upper surface of the electric fuel cell stack 4, and a pressure plate 1 is positioned above the guide plate 3. A spring assembly 2 is positioned between the pressure plate 1 and the guide plate 3. The pressure bolts 7 pass through the pressure plate 1 and are threadedly connected to nuts 71. Each set of pressure bolts comprises four bolts forming a rectangular space for placing the electric fuel cell stack 4. It is understood that in other embodiments, six, eight, or more pressure bolts may be used to form a rectangle for placing the corresponding electric fuel cell stack 4.

[0030] like Figure 3 , Figure 4 As shown, the upper surface of the gas distribution base plate 5 is provided with two sets of air holes 55. Each set of air holes includes an air inlet 551, a fuel gas inlet 552, an air outlet 553, and a fuel gas outlet 554. Identical air holes in the two sets of air holes 55 are connected by corresponding flow channels 52 inside the gas distribution base plate 5. The flow channels 52 are connected to corresponding pipes 53 at the bottom of the gas distribution base plate through corresponding transfer flow channels 54 inside the gas distribution base plate 5. The connection point between the transfer flow channel 54 and the flow channel 52 is located at the centerline of the flow channel 52. It should be noted that the bottom surface of the fuel cell stack 4 is also provided with a set of air holes. This set of air holes on the bottom surface of the fuel cell stack 4 has the same position, function, and size as each set of air holes 55 on the gas distribution base plate 5; that is, this set of air holes on the bottom surface of the fuel cell stack 4 can be connected to a corresponding set of air holes on the gas distribution base plate 5.

[0031] like Figure 3 , Figure 4 As shown, two sets of threaded holes 51 are provided on the gas distribution base plate 5 to accommodate the pressure bolts 7. Specifically, in this embodiment, threaded holes 51 are provided at the four corners and on both sides of the center line of the long side of the gas distribution base plate 5, for a total of eight threaded holes 51; on both sides of the center line of the long side, four threaded holes 51 are arranged as a group. The threaded holes 51 are used to pass through the pressure bolts 7 and are threadedly connected to the pressure bolts 7. On both sides of the center line of the long side, four pressure bolts 7 are arranged as a group, forming a rectangle for placing the fuel cell stack 4; as shown Figure 1 , Figure 2 As shown, a bolt head is fixed at one end of the pressure bolt 7, and the diameter of the bolt head is larger than that of the threaded hole 51.

[0032] like Figure 1 , Figure 2As shown, after the pressure bolt 7 passes through the threaded hole 51, multiple insulating sleeves 8 are inserted through the pressure bolt 7. The insulating sleeves 8 are square. After the insulating sleeves 8 are inserted through the pressure bolt 7, the fuel cell stack 4 is placed between the four pressure bolts 7 in the same group, and a guide plate 3 is placed on top of the fuel cell stack 4. The top surface of the uppermost insulating sleeve 8 should be above the top surface of the guide plate 3. The fuel cell stack 4 is clamped between the insulating sleeves 8.

[0033] It should be noted that the guide plate 3 needs to be engaged between the insulating sleeve 8 on at least two sides, such as Figure 1 , Figure 2 As shown, in this embodiment, the long side of the guide plate 3 is positioned between the insulating sleeves 8; its function is that when the guide plate 3 is pressed down, the insulating sleeves 8 can provide a certain guiding effect on the guide plate 3, so that the guide plate 3 can uniformly transmit force downward to the fuel cell stack 4.

[0034] like Figure 1 , Figure 2 As shown, a plurality of guide posts 31 are evenly arranged on the top of the guide plate 3. In this embodiment, there are six guide posts 31, arranged in an array of two rows and three columns on the top of the guide plate 3. In other embodiments, four, eight, nine or more can be provided, as long as they are evenly distributed in an array on the top surface of the guide plate. The guide plate 3 is connected to the pressure plate 1 through the guide posts 31. Specifically, the pressure plate 1 is provided with guide holes. It can be understood that the number and position of the guide holes match the guide posts 31. The pressure plate 1 is placed above the guide plate 3, so that the multiple guide posts 31 pass through their respective guide holes to complete the connection.

[0035] The pressure plate 1 has several through holes, the number of which is equal to the number of each set of pressure bolts 7 and their positions correspond. For example... Figure 1 , Figure 2 As shown, in this embodiment, through holes are provided at the four corners of the pressure plate 1. The screws of the four pressure bolts 7 in the same group can pass through the through holes. Through the engagement of the threaded screw holes with the pressure bolts 7, and the engagement of the guide post with the guide hole, the pressure plate 1 can move vertically downward to apply pressure to the guide pressure plate 3. The through holes here are smooth through holes.

[0036] like Figure 1 , Figure 2 As shown, a spring assembly 2 is provided between the guide plate 3 and the pressure plate 1. Specifically, the spring assembly 2 includes springs equal in number to the guide posts 31. The springs are sleeved on the guide posts 31, with one end abutting the top surface of the guide plate 3 and the other end abutting the bottom surface of the pressure plate 1. By applying pressure to the pressure plate 1, the spring assembly 2 is compressed, and the spring assembly 2 transmits the pressure to the guide plate 3. Figure 1 , Figure 2As shown, the connection is completed above the pressure plate 1 by tightening the matching nut 71 on the screw of the pressure bolt 7.

[0037] The position of the pressure plate 1 can be adjusted according to the height and pressure requirements of the fuel cell stack. When the fuel cell stack power is high / low, or the number of internal repeating unit layers is large / small, the pressure bolts can be adjusted to ensure the spring assembly reaches the target pressure, and then the pressure plate can be positioned appropriately. Alternatively, the length of the pressure bolts between the pressure plate and the gas distribution base plate can be adjusted according to the pressure requirements to ensure the fuel cell stack is under suitable pressure.

[0038] Specifically, when the nut 71 is tightened on the pressure bolt 7, the space between the pressure plate 1 and the gas distribution base plate 5 will be compressed. The spring assembly 2 can evenly transmit and distribute the pressure of the pressure bolt 7 to the fuel cell stack 4. Compared with rigid transmission, the spring plays a secondary role in the transmission of force, and the fuel cell stack 4 is subjected to more uniform force.

[0039] Understandably, when the pressure plate 1 deforms slightly under stress, if there is no spring assembly 2 between the pressure plate 1 and the guide plate 3, the deformation of the pressure plate 1 will be directly transmitted to the guide plate 3, causing the guide plate 3 to warp under stress, resulting in uneven pressure on the upper surface of the fuel cell stack 4. When the spring assembly 2 is installed in the middle, the pressure is redistributed, and the guide plate 3 is not affected by the deformation of the pressure plate 1. The pressure is transmitted evenly to the guide plate, making the guide plate and the upper surface of the fuel cell stack experience uniform stress.

[0040] The spring assembly between the pressure plate and the guide plate is also important because the spring assembly undergoes significant deformation after assembly at room temperature. When the fuel cell stack 4 operates at high temperatures, the different thermal expansion coefficients of different materials in different areas of the stack 4 can lead to mismatches in thermal deformation at high temperatures. In this case, the spring assembly 2 can be appropriately compressed or expanded to compensate for the difference in overall structural deformation caused by thermal deformation, ensuring that the fuel cell stack still has sufficient pressure to guarantee its normal operation. Without this spring compensation structure, when thermal deformation occurs, relying solely on bolt pressure would result in significant pressure loss.

[0041] like Figure 1 , Figure 2 , Figure 3 As shown, eight air holes 55 are provided on the top surface of the air distribution base plate 5. The eight air holes 55 are divided into two groups with the center line of the long side of the air distribution base plate 5 as the boundary. Each group of air holes 55 includes four holes, namely an air inlet 551, a fuel gas inlet 552, an air outlet 553, and a fuel gas outlet 554.

[0042] like Figure 3 As shown, the gas distribution base plate 5 has internal flow channels 52, namely air intake channel 521, gas intake channel 522, air outlet channel 523, and gas outlet channel 524; as Figure 3As shown, the air intake channel 521 is connected to the air intake port 551 at both ends. Similarly, the gas intake channel 522 is connected to the gas intake port 552 at both ends. The air outlet channel 523 is connected to the air outlet port 553 at both ends. The gas outlet channel 524 is connected to the gas outlet port 554 at both ends.

[0043] like Figure 4 As shown, the bottom of the gas distribution base plate 5 is provided with corresponding pipes 53 connected to each flow channel 52, namely air intake pipe 531, gas intake pipe 532, air outlet pipe 533, and gas outlet pipe 534. Specifically, the connection between each pipe 53 and the corresponding flow channel 52 is achieved through a corresponding transfer flow channel 54. Specifically, the transfer flow channel 54 includes air intake transfer flow channel 541, gas intake transfer flow channel 542, air outlet transfer flow channel 543, and gas outlet transfer flow channel 544; wherein, one end of the transfer flow channel 54 is connected to the corresponding pipe 53, and the other end is connected to the corresponding flow channel 52.

[0044] It should be noted that the connection between the intermediate flow channel 54 and the corresponding flow channel 52 is located at the centerline of the flow channel. The reason for this design is to ensure that the air intake and exhaust of each flow channel are uniform.

[0045] Understandably, the bottom of the fuel cell stack 4 also has corresponding vents of the same size and function. The fuel cell stack 4 is placed on top of the gas distribution base plate 5, aligning the vents of the fuel cell stack 4 with those on the gas distribution base plate. The guide pressure plate 3, spring assembly 2, and pressure plate 1 are then installed in sequence, and the nuts 71 are tightened to provide pressure for the seal between the fuel cell stack and the gas distribution base plate. Next, the air intake pipe 531 and the gas intake pipe 532 are opened to supply gas. Air or gas is evenly distributed through the corresponding flow channels 52 inside the gas distribution base plate, and then enters the two fuel cell stacks 4 through the corresponding air intake holes on the plate surface. After the reaction is completed inside the fuel cell stack, the gas returns to the gas distribution base plate through the corresponding exhaust holes on the plate, and finally exits through the air exhaust pipe 533 or the gas exhaust pipe 534.

[0046] In this embodiment, when the transfer channel 54 of the gas distribution base plate 5 is connected to the channel 52, the connection position is located in the middle of the channel 52, which can uniformly distribute the gas; in the working state, the air side flow rate deviation of the two fuel cell stacks 4 is 0.009%, the gas side flow rate deviation is 0.07%, and the working conditions of the two fuel cell stacks are the same.

[0047] By setting two sets of air holes on the gas distribution base plate, each set of air holes corresponds to a set of air holes at the bottom of the two fuel cell stacks on the gas distribution base plate; multiple flow channels are set in the gas distribution base plate to connect the two sets of air holes respectively, and a corresponding transfer flow channel is connected in the middle of each flow channel, so that the transfer flow channel is connected to the corresponding pipe, so that the gas can be evenly distributed in the flow channel and then enter the two sets of air holes, ensuring that the two fuel cell stacks operate under the same conditions, thereby realizing the parallel connection of the two fuel cell stacks and preventing the failure of the entire module when one fuel cell stack fails.

[0048] like Figure 1 , Figure 2 As shown, the bottom of the air distribution base plate 5 is mounted on the base 6 via a bracket 9. The base 6 is used to fix it to the ground or workbench. The top of the bracket 9 is a support frame, consisting of... Figure 1 , Figure 2 As can be seen, the support frame is used to support the air distribution base plate 5, and the connection between the support frame and the air distribution base plate 5 is a fixed connection. The fixed welding method can be to weld the support frame to the bottom of the air distribution base plate 5; or it can be connected with ordinary bolts. It is understood that when the support frame and the air distribution base plate 5 are connected with ordinary bolts, the ordinary bolts should avoid the flow channel 52 and the intermediate flow channel 54; the base 6 can be fixedly connected to the bracket 9 by welding. This ensures stable support for the air distribution base plate 5.

[0049] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A parallel module for dual anode reactors in SOFC, characterized in that, It includes a gas distribution base plate, on which two sets of pressure bolts are installed. An electric stack is set in the rectangular space enclosed between each set of pressure bolts. A guide plate is set on the upper surface of the electric stack. A pressure plate is set above the guide plate. A spring assembly is set between the pressure plate and the guide plate. The pressure bolts are threaded to nuts after passing through the pressure plate. The upper surface of the gas distribution base plate is provided with two sets of air holes. Each set of air holes includes an air inlet, a fuel inlet, an air outlet, and a fuel outlet. Identical air holes in the two sets of air holes are connected by corresponding flow channels inside the gas distribution base plate. The flow channels are connected to corresponding pipes at the bottom of the gas distribution base plate through corresponding transfer flow channels inside the gas distribution base plate. The connection between the transfer flow channels and the flow channels is located at the center line of the flow channels.

2. The SOFC anode stack dual-stall parallel module as described in claim 1, characterized in that, The gas distribution base plate is provided with two sets of threaded holes. The pressure bolt passes through the threaded holes and is threadedly connected to them. One end of the pressure bolt is fixed with a bolt head, the diameter of which is larger than that of the threaded hole.

3. The SOFC anode stack dual-stall parallel module as described in claim 1, characterized in that, Multiple insulating sleeves are inserted through the pressure bolt. The insulating sleeves are square, and the top of the top insulating sleeve is located at the top of the guide plate. The guide plate needs to be clamped between the insulating sleeves on at least two sides.

4. The SOFC anode stack dual-stall parallel module as described in claim 1, characterized in that, Multiple guide posts are evenly arranged on the top of the guide plate, and the guide posts are distributed in an array on the top of the guide plate.

5. A parallel module for anode reactors of SOFC as described in claim 4, characterized in that, The guide plate is connected to the pressure plate through the guide post. Specifically, the pressure plate is provided with a number of guide holes equal to the number of guide posts, and the position of the guide holes matches the position of the guide posts. The spring assembly includes a number of springs equal to the number of guide posts, and each spring is sleeved on a guide post.

6. The SOFC anode stack dual-stall parallel module as described in claim 1, characterized in that, The pressure plate is provided with several through holes, and the screw of the pressure bolt passes through the through holes and is threaded to the nut; the bottom of the air distribution base plate is set on the base by a bracket, and the base is used to fix it to the ground or workbench.

7. A parallel module for dual anode reactors of SOFC as described in claim 1, characterized in that, The gas distribution base plate is provided with flow channels, namely an air inlet flow channel, a gas inlet flow channel, an air outlet flow channel, and a gas outlet flow channel; the two ends of the air inlet flow channel are connected to air inlet holes, the two ends of the gas inlet flow channel are connected to gas inlet holes, the two ends of the air outlet flow channel are connected to air outlet holes, and the two ends of the gas outlet flow channel are connected to gas outlet holes.

8. A parallel module for dual anode reactors of SOFC as described in claim 1, characterized in that, The corresponding pipes installed at the bottom of the gas distribution base plate include air intake pipes, gas intake pipes, air outlet pipes, and gas outlet pipes.

9. A parallel module for dual anode reactors of SOFC as described in claim 1, characterized in that, The corresponding transfer channels include an air intake transfer channel, a gas intake transfer channel, an air outlet transfer channel, and a gas outlet transfer channel.

10. A parallel module for anode reactors of SOFC as described in claim 1, characterized in that, A set of vents is also provided on the bottom surface of the fuel cell stack. The position, function, and size of this set of vents on the bottom surface of the fuel cell stack are consistent with each set of vents on the gas distribution base plate.

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