Airflow distribution device and module

Abstract

The application discloses a kind of airflow distribution device and module, the airflow distribution device includes main part and isolation device, main part has with waste gas exhaust structure and the first side and second side of relative arrangement, first side is provided with first supply area, second side is provided with second supply area, first supply area and second supply area between being provided with isolation device, to separate first supply area and second supply area, first supply area has first fuel supply structure, the both ends of first fuel supply structure are respectively communicated with the first fuel inlet of first electric pile and fuel source, second supply area has second fuel supply structure, the both ends of second fuel supply structure are respectively communicated with the second fuel inlet of second electric pile and fuel source.The application can effectively reduce the influence of processing error due to manufacturing process on gas distribution, ensure the purity and stability of fuel supply, help to maintain consistency and reliability between each electric pile.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solid oxide fuel cell, in particular to a gas flow distribution device and module. BACKGROUND

[0002] As a kind of high efficiency, environmental protection electrochemical device, solid oxide fuel cell (SOFC) can directly convert the chemical energy stored in fuel and oxidant into electrical energy. Since 1940s, fuel cell technology has experienced four generations of development, among which solid oxide fuel cell (SOFC) as the third generation of fuel cell, with its high power generation efficiency, strong fuel adaptability and high temperature waste heat recycling advantages. The core of SOFC is the stable operation of its stack unit. In order to reduce the temperature gradient between the stack units, and prevent the damage caused by the excessive fuel utilization of part of the stack, the amount of fuel gas supplied to each stack unit needs to be as consistent as possible.

[0003] Currently, the fuel gas distribution in each stack unit usually depends on the fine design of flow channel system, which needs to be closely combined with the stack to ensure that the fuel gas can be evenly distributed to each stack unit. However, in the prior art, due to the close relationship between the processing error between the distribution flow channel and the stack, it is difficult to achieve the expected fuel gas distribution index for the substandard stack within the tolerance limit, which not only affects the performance of the whole module, but also may shorten its service life. SUMMARY

[0004] The purpose of the present application is to provide a gas flow distribution device and module, which can effectively reduce the influence of processing error caused by the manufacturing process on fuel gas distribution, ensure the purity and stability of fuel supply, and help to maintain the consistency and reliability of each stack performance.

[0005] In order to achieve the above purpose, the present application provides a gas flow distribution device for gas flow distribution between a first stack and a second stack arranged in stack, comprising a main body and a separation device, the main body has a waste gas discharge structure and oppositely arranged first side and second side, the waste gas discharge structure is respectively communicated with the first fuel outlet of the first stack and the second fuel outlet of the second stack, the first side is provided with a first supply area, the second side is provided with a second supply area, the first supply area and the second supply area are provided with the separation device to separate the first supply area and the second supply area, the first supply area has a first fuel supply structure, both ends of the first fuel supply structure are respectively communicated with the first fuel inlet of the first stack and the fuel source, the second supply area has a second fuel supply structure, both ends of the second fuel supply structure are respectively communicated with the second fuel inlet of the second stack and the fuel source.

[0006] Further, the first fuel supply structure comprises a first fuel passage and a first fuel chamber, the first fuel chamber is correspondingly arranged with the first fuel inlet, and the first fuel chamber circumscribes the fuel source through the first fuel passage;

[0007] The second fuel supply structure comprises a second fuel passage and a second fuel chamber, the second fuel chamber is correspondingly arranged with the second fuel inlet, and the second fuel chamber circumscribes the fuel source through the second fuel passage.

[0008] Further, the pressure loss difference between the first fuel passage and the second fuel passage is not more than 10%.

[0009] Further, the pressure loss of the first fuel passage is greater than the pressure loss between the first fuel outlet and the first fuel inlet, and the pressure loss of the second fuel passage is greater than the pressure loss between the second fuel outlet and the second fuel inlet.

[0010] Further, the first fuel passage comprises a first inlet section and a first outlet section, the first outlet section communicates with the first fuel chamber, the first inlet section circumscribes the fuel source, and the inner diameter of the first inlet section is greater than the inner diameter of the first outlet section.

[0011] The second fuel passage comprises a second inlet section and a second outlet section, the second outlet section communicates with the second fuel chamber, the second inlet section circumscribes the fuel source, and the inner diameter of the second inlet section is greater than the inner diameter of the second outlet section.

[0012] Further, the first fuel passage is partially exposed to the first fuel chamber to circumscribe the fuel source, and the tail end of the first outlet section is located inside the first fuel chamber.

[0013] The second fuel passage is partially exposed to the second fuel chamber to circumscribe the fuel source, and the tail end of the second outlet section is located inside the second fuel chamber.

[0014] Further, a plurality of precision tubes are further included, the first fuel passage is provided with the precision tubes, one end of the precision tubes away from the first fuel chamber communicates with the fuel source, and the pressure loss of the precision tubes is greater than the pressure loss between the first fuel outlet and the first fuel inlet; and / or,

[0015] The second fuel passage is provided with the precision tubes, one end of the precision tubes away from the second fuel chamber communicates with the fuel source, and the pressure loss of the precision tubes is greater than the pressure loss between the second fuel outlet and the second fuel inlet.

[0016] Further, the precision pipe comprises a third inlet section and a third outlet section, the first fuel chamber and / or the second fuel chamber is in communication with the corresponding third outlet section, the third inlet section circumscribes the fuel source, and the inner diameter of the third inlet section is greater than the inner diameter of the third outlet section.

[0017] Further, the tail end of the third outlet section is located inside the first fuel chamber or the second fuel chamber.

[0018] The length of the precision pipe is greater than or equal to the length of the first fuel channel, and less than the sum of the lengths of the first fuel channel and the first fuel chamber; and / or, the length of the precision pipe is greater than or equal to the length of the second fuel channel, and less than the sum of the lengths of the second fuel channel and the second fuel chamber.

[0019] The application also provides a module comprising a first stack, a second stack and the airflow distribution device as described above, the first stack and the second stack are arranged in a stack, and the airflow distribution device is located between the first stack and the second stack, two ends of the first fuel supply structure are in communication with the first fuel inlet of the first stack and the fuel source respectively, two ends of the second fuel supply structure are in communication with the second fuel inlet of the second stack and the fuel source respectively, and the exhaust gas discharge structure is in communication with the first fuel outlet of the first stack and the second fuel outlet of the second stack respectively.

[0020] Compared with the prior art, the airflow distribution device and the module provided by the application have the following beneficial effects:

[0021] The first supply area and the second supply area are arranged to supply fuel to the first stack and the second stack respectively, so that the first stack and the second stack can obtain the preset amount of fuel, the overall efficiency is improved, the isolation device arranged between the first supply area and the second supply area prevents direct interaction of fuel between the first supply area and the second supply area, so as to prevent the airflow entering the first stack and the second stack from being uneven, the influence of the machining error generated in the manufacturing process on the fuel gas distribution is effectively reduced, the purity and stability of the fuel supply are ensured, and the consistency and reliability of the first stack and the second stack are maintained. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the module provided by the application;

[0023] Figure 2 is a structural schematic diagram of the airflow distribution device provided by the application;

[0024] Figure 3is a sectional view of the air flow distribution device provided by the embodiment of the present application;

[0025] Figure 4 is a structural schematic diagram of the precision pipe provided by the embodiment of the present application;

[0026] In the figure, 1, air flow distribution device; 11, main body part; 111, waste gas discharge structure; 1111, waste gas through hole; 1112, waste gas channel; 112, first side surface; 113, second side surface; 12, isolation device; 13, first supply area; 131, first fuel supply structure; 1311, first fuel channel; 1312, first fuel chamber; 14, second supply area; 141, second fuel supply structure; 1411, second fuel channel; 1412, second fuel chamber; 15, precision pipe; 151, inlet section; 152, outlet section; 2, first electric pile; 3, second electric pile; 31, second fuel outlet; 32, second fuel inlet. DETAILED DESCRIPTION

[0027] The specific implementation of the present application will be further described in detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0028] As Figures 1 to 3 shown, the present application provides a module, including air flow distribution device 1, first electric pile 2 and second electric pile 3, the first electric pile 2 and the second electric pile 3 are stacked, and the air flow distribution device 1 is located between the first electric pile 2 and the second electric pile 3, for air flow distribution between the first electric pile 2 and the second electric pile 3 arranged in stack, the air flow distribution device 1 includes main body part 11 and isolation device 12, the main body part 11 has waste gas discharge structure 111 and oppositely arranged first side surface 112 and second side surface 113, the waste gas discharge structure 111 is communicated with the first fuel outlet (not shown in the figure) of the first electric pile 2 and the second fuel outlet 31 of the second electric pile 3 respectively, to guide the waste gas generated after reaction out, prevent the waste gas from accumulating to cause damage to the first electric pile 2 and the second electric pile 3, at the same time, it is also convenient for subsequent processing or utilizing the waste heat and other resources in these waste gases.

[0029] The first side 112 is provided with a first supply area 13, the second side 113 is provided with a second supply area 14, and the first supply area 13 and the second supply area 14 are provided with a separation device 12 to separate the first supply area 13 and the second supply area 14. The two ends of the first supply area 13 are respectively communicated with the first fuel inlet (not shown in the figure) of the first stack 2 and the fuel source, and the two ends of the second supply area 14 are respectively communicated with the second fuel inlet 32 of the second stack 3 and the fuel source, so as to ensure that the fuel can smoothly enter the first stack 2 and the second stack 3 for reaction. The two independent supply paths ensure that the first stack 2 and the second stack 3 have stable and sufficient fuel supply, and maintain continuous and efficient work.

[0030] The first stack 2 and the second stack 3 of the embodiment are arranged vertically together, and the airflow distribution device 1 is arranged between the first stack 2 and the second stack 3, which is used to adjust and optimize the airflow distribution between the adjacent first stack 2 and the second stack 3, so as to ensure that the first stack 2 and the second stack 3 can obtain uniform and appropriate fuel gas, so as to avoid performance decline or damage caused by uneven fuel gas distribution. It can be understood that by arranging the airflow distribution device 1 between the adjacent two stacks in the parallel connection of multiple stacks, the uniform distribution of the fuel inlet amount of each stack in the large SOFC module system can be realized, and the fuel gas distribution of each stack in the module and the processing error of the stack itself are decoupled.

[0031] Specifically, the first supply area 13 is a delivery area for supplying fuel to the first stack 2 located above, and provides fuel for the first stack 2 to generate chemical reaction to generate electricity. The first supply area 13 has a first fuel supply structure 131, and the first stack 2 is provided with a first fuel inlet at the bottom. The two ends of the first fuel supply structure 131 are respectively communicated with the first fuel inlet of the first stack 2 and the fuel source. The second supply area 14 is a delivery area for supplying fuel to the second stack 3 located below, and provides fuel for the second stack 3 to generate chemical reaction to generate electricity. The second supply area 14 has a second fuel supply structure 141, and the second stack 3 is provided with a second fuel inlet 32 at the top. The two ends of the second fuel supply structure 141 are respectively communicated with the second fuel inlet 32 of the second stack 3 and the fuel source.

[0032] It can be understood that in the air flow distribution device 1, the first supply area 13, the isolation device 12 and the second supply area 14 are sequentially arranged from top to bottom, and the isolation device 12 can isolate the two air flows of the first supply area 13 and the second supply area 14, preventing the air flows of the first supply area 13 and the second supply area 14 from mixing. According to the structure, the fuel amount of the first stack 2 and the second stack 3 can be controlled by controlling the air flow distribution of the first supply area 13 and the second supply area 14, thereby avoiding damage caused by uneven fuel distribution of the first stack 2 and the second stack 3. It should be noted that the isolation device 12 of the embodiment can be a separate component welded with the main body 11, or can be integrally formed with the main body 11, which is not particularly limited here.

[0033] Based on the above structure, by arranging the first supply area 13 and the second supply area 14, the fuel supply amount of the first stack 2 and the second stack 3 can be separately controlled, so that the first stack 2 and the second stack 3 can obtain the preset fuel amount, improve the overall efficiency, and prevent the direct interaction of the fuel between the first supply area 13 and the second supply area 14 by arranging the isolation device 12 between the first supply area 13 and the second supply area 14, so as to prevent the air flow entering the first stack 2 and the second stack 3 from being uneven, which can effectively reduce the influence of the machining error generated in the manufacturing process on the fuel gas distribution, ensure the purity and stability of the fuel supply, and help maintain the consistency and reliability between the first stack 2 and the second stack 3.

[0034] Further, the exhaust gas discharge structure 111 includes exhaust gas through holes 1111 and an exhaust gas passage 1112, the exhaust gas through holes 1111 are respectively connected with the first fuel outlet and the second fuel outlet 31, and the exhaust gas through holes 1111 are communicated with the exhaust gas passage 1112.

[0035] The bottom of the first stack 2 is provided with a first fuel outlet, and the top of the second stack 3 is provided with a second fuel outlet 31, and the first fuel outlet and the second fuel outlet 31 are designed symmetrically; the first fuel outlet is used for discharging the exhaust gas of the first stack 2, and the second fuel outlet 31 is used for discharging the exhaust gas of the second stack 3, and the exhaust gas of the first stack 2 and the second stack 3 is combined through the exhaust gas through holes 1111 and then discharged through the exhaust gas passage 1112, so that the pressure at the first fuel outlet and the second fuel outlet 31 is consistent, the back pressure of the first stack 2 and the second stack 3 is consistent, and the performance and distribution difference of the first stack 2 and the second stack 3 is avoided from being increased.

[0036] It should be noted that the exhaust gas passage 1112 of the embodiment is connected with an exhaust gas pipeline connected with an exhaust gas collecting device.

[0037] Further, the first fuel supply structure 131 comprises a first fuel passage 1311 as a path for fuel to be transmitted from an external fuel source to a first fuel chamber 1312, and the first fuel chamber 1312 is circumscribed by the first fuel passage 1311 and is arranged in correspondence with the first fuel inlet so that fuel is distributed to the first stack 2 through the first fuel chamber 1312; the second fuel supply structure 141 comprises a second fuel passage 1411 as a fuel supply path for the second stack 3, and a second fuel chamber 1412 circumscribed by the second fuel passage 1411 and arranged in correspondence with the second fuel inlet 32 so that fuel is distributed to the second stack 3 through the second fuel chamber 1412.

[0038] The first fuel passage 1311 and the second fuel passage 1411 of the present embodiment are used to provide a buffer path to slow down the speed of fuel gas reaching the first fuel inlet and the second fuel inlet 32, so as to prevent the fuel gas from flowing at too high a speed to cause impact damage to the first stack 2 and the second stack 3. The area of the first fuel chamber 1312 (or the second fuel chamber 1412) can be greater than or equal to the area of the first fuel inlet (or the second fuel inlet 32), and when the area of the first fuel chamber 1312 (or the second fuel chamber 1412) is greater than the area of the first fuel inlet (or the second fuel inlet 32), it not only facilitates the adaptation of stacks of different fuel inlet specifications, but also reduces the gas flow rate due to the large enough area of the first fuel chamber 1312 (or the second fuel chamber 1412), so that the gas can flow smoothly into the internal flow channel of the stack.

[0039] Further, the pressure loss difference between the first fuel passage 1311 and the second fuel passage 1411 is not more than 10%, so as to improve the stability of the module. The fuel gas flows through the first fuel passage 1311 and the second fuel passage 1411, respectively, and then enters the independently separated first fuel chamber 1312 and the second fuel chamber 1412, and finally flows to the first stack 2 and the second stack 3. Preferably, the pressure loss difference between the first fuel passage 1311 and the second fuel passage 1411 is not more than 5%.

[0040] Further, the pressure loss of the first fuel passage 1311 is greater than the pressure loss between the first fuel outlet and the first fuel inlet, and the pressure loss of the second fuel passage 1411 is greater than the pressure loss between the second fuel outlet 31 and the second fuel inlet 32.

[0041] It can be understood that, since the flow rates of the first stack 2 and the second stack 3 in the module need to be consistent, inconsistent flow rates will affect the power generation performance and operation stability of the module or system, but there are inevitable processing errors between the first stack 2 and the second stack 3 or between the modules, resulting in inconsistent flow rates (i.e. inconsistent pressure loss at constant flow rate) between the first stack 2 and the second stack 3. The above pressure loss requirement is set in the embodiment, so that the total pressure loss is large enough to ignore the problem of inconsistent flow rates caused by processing errors between the first stack 2 and the second stack 3 or between the modules.

[0042] It can also be understood that the total pressure loss of the embodiment includes the pressure loss of the first fuel passage 1311 and the pressure loss between the first fuel outlet and the first fuel inlet, the pressure loss of the second fuel passage 1411 and the pressure loss between the second fuel outlet 31 and the second fuel inlet 32.

[0043] Further, the first fuel passage 1311 includes a first inlet section and a first outlet section, the first outlet section communicates with the first fuel chamber 1312, the first inlet section is externally connected to the fuel source, and the inner diameter of the first inlet section is greater than that of the first outlet section; fuel of the embodiment enters from the first inlet section and then is output from the first outlet section until it is output to the first fuel chamber 1312. It can be understood that, by setting a transition section with a larger inner diameter at the first inlet section, the deformation error caused by welding or other connection methods at the connection when communicating with the fuel source is alleviated. In addition, by making the inner diameter of the first inlet section greater than that of the second outlet section, a welding avoidance is provided to prevent overheating during welding from causing deformation and affecting the flow accuracy of the first fuel passage 1311, wherein the length of the first inlet section is not designed to meet the welding requirements.

[0044] Similarly, the second fuel passage 1411 includes a second inlet section and a second outlet section, the second outlet section communicates with the second fuel chamber 1412, the second inlet section is externally connected to the fuel source, and the inner diameter of the second inlet section is greater than that of the second outlet section, to provide a welding avoidance to prevent overheating during welding from causing deformation and affecting the flow accuracy of the second fuel passage 1411.

[0045] Further, the first fuel passage 1311 is partially exposed to the first fuel chamber 1312 to externally connect to the fuel source, and the tail end of the first outlet section is located inside the first fuel chamber 1312, and the first outlet section is not directly close to the inner wall of the first fuel chamber 1312, to prevent the gas passage from being blocked due to thermal expansion or processing errors at high temperature.

[0046] Similarly, the second fuel passage 1411 is partially exposed to the second fuel chamber 1412 to externally connect the fuel source, and the tail end of the second outlet section is located inside the second fuel chamber 1412, and the second outlet section is not directly close to the inner wall of the second fuel chamber 1412, so as to prevent the gas path from being blocked due to thermal expansion or processing errors at high temperatures.

[0047] Further, as shown in Figure 3 and Figure 4 Also include a plurality of precision tubes 15, the first fuel passage 1311 is provided with the precision tube 15, and the end of the precision tube 15 away from the first fuel chamber 1312 is in communication with the fuel source, and / or, the second fuel passage 1411 is provided with the precision tube 15, and the end of the precision tube 15 away from the second fuel chamber 1412 is in communication with the fuel source. It should be noted that the precision tube 15 can be provided only in the first fuel passage 1311 or the second fuel passage 1411, as long as the first fuel passage 1311 or the second fuel passage 1411 without the precision tube 15 meets the above requirements for pressure loss. Of course, the precision tube 15 can also be provided in the first fuel passage 1311 and the second fuel passage 1411, and preferably, the first fuel passage 1311 and the second fuel passage 1411 of the present embodiment are provided with the precision tube 15.

[0048] The air intake amount of the first stack 2 and the second stack 3 of the present embodiment is controlled by the precision tube 15, and the first supply area 13 and the second supply area 14 are isolated by the isolation device 12, so that the air intake amount of the first stack 2 and the second stack 3 is independently controlled by the precision tube 15, avoiding uneven flow distribution. It should be noted that the first stack 2 is an inverted stack; that is, the first fuel inlet and the first fuel outlet of the first stack 2 are at the bottom, and the second fuel inlet 32 and the second fuel outlet 31 of the second stack 3 are at the top. The inverted arrangement of the first stack 2 enables the first stack 2 and the second stack 3 to share one air flow distribution device 1, greatly reducing material costs. The positive and negative electrodes of the inverted first stack 2 and the non-inverted second stack 3 face the same direction, and are connected in series to output voltage.

[0049] It can be understood that the precision tube 15 is a replaceable component, and users can design precision tubes 15 with different inner diameters according to the flow, pressure drop and other requirements to achieve pre-control of flow and pressure loss, thereby reducing the problem of mismatch after product molding and reducing manufacturing costs. In addition, the precision tube 15 of the present embodiment refers to a steel pipe made of a material (for example, titanium alloy-military alloy) that is resistant to high temperature, has small thermal cycle deformation, has no side reaction with high-temperature fuel gas, and has no volatile toxic substances, which can adapt to changes in the high-temperature environment of the fuel cell, reduce environmental errors, and improve the precision of fuel input.

[0050] In actual application, the first fuel inlet has two, the two first fuel inlets are symmetrically designed relative to the first fuel chamber 1312, and the internal flow channel design of the first stack 2 needs to ensure the fuel gas distribution in the single-layer cell. If the number of first fuel inlets is too large, the sealing of the first fuel inlet is difficult, and if the number of first fuel inlets is too small, the design difficulty of the single-layer cell distribution flow channel is large. The two first fuel inlets of the embodiment can reduce the processing difficulty and improve the space utilization. Similarly, the second fuel inlet 32 has two, and the two second fuel inlets 32 are symmetrically designed relative to the second fuel chamber 1412.

[0051] In the embodiment, the pressure loss of the first fuel channel 1311 and the second fuel channel 1411 is consistent, the pressure loss of the first stack 2 and the second stack 3 is consistent, the stability of the module is improved, the fuel gas passes through two precision pipes 15, and then enters the independently separated first fuel chamber 1312 and second fuel chamber 1412, and finally enters the first stack 2 and the second stack 3.

[0052] It can be understood that, since the geometric size of the precision pipe 15 determines the pressure loss of the entire first fuel channel 1311 and second fuel channel 1411, and the fuel gas flow rate in the precision pipe 15 is fast and the inner diameter is small, the embodiment controls the geometric size of the two precision pipes 15 and symmetrically sets the two precision pipes 15, so that under the condition of tolerance, the pressure loss of the first fuel channel 1311 and the second fuel channel 1411 meets the consistency.

[0053] Further, the first fuel channel 1311 is located on the central axis of the first fuel chamber 1312; and the second fuel channel 1411 is located on the central axis of the second fuel chamber 1412.

[0054] The first fuel inlet of the embodiment is symmetrically designed relative to the first fuel chamber 1312, the second fuel inlet 32 is symmetrically designed relative to the second fuel chamber 1412, and the first fuel channel 1311 is located on the central axis of the first fuel chamber 1312, and the second fuel channel 1411 is located on the central axis of the second fuel chamber 1412, which can ensure that the fuel gas entering the first fuel chamber 1312 and the second fuel chamber 1412 is evenly distributed to the left and right two first fuel inlets of the first stack 2 and the left and right two second fuel inlets 32 of the second stack 3.

[0055] Further, the pressure loss of the precision pipe 15 is greater than the pressure loss between the first fuel outlet and the first fuel inlet, and / or the pressure loss of the precision pipe 15 is greater than the pressure loss between the second fuel outlet 31 and the second fuel inlet 32.

[0056] Understandably, since the flow rates to the first fuel cell stack 2 and the second fuel cell stack 3 in the module must be consistent, inconsistencies in flow rates will affect the power generation performance and operational stability of the system. However, unavoidable manufacturing errors exist between the first fuel cell stack 2 and the second fuel cell stack 3, or between the modules, resulting in inconsistent flow rates allocated to the first fuel cell stack 2 and the second fuel cell stack 3 (i.e., inconsistent pressure loss at constant flow rate temperature). In this embodiment, a precision tube 15 is installed in the first fuel channel 1311 or the second fuel channel 1411 to increase the total pressure loss. When the total pressure loss is sufficiently large, the problem of inconsistent flow rates caused by manufacturing errors between the first fuel cell stack 2 and the second fuel cell stack 3, or between the modules, can be ignored.

[0057] It can also be understood that the total pressure loss includes the pressure loss of the precision tube 15, the compression between the first fuel outlet and the first fuel inlet, and / or the pressure loss between the second fuel outlet 31 and the second fuel inlet 32. When the pressure loss of the precision tube 15 is much greater than the pressure loss between the first fuel outlet and the first fuel inlet of the first fuel cell stack 2, the magnitude of the total pressure loss depends on the pressure loss of the precision tube 15, making the pressure loss difference caused by the processing error between the first fuel cell stacks 2 negligible. Similarly, when the pressure loss of the precision tube 15 is much greater than the pressure loss between the second fuel outlet 31 and the second fuel inlet 32 ​​of the second fuel cell stack 3, the magnitude of the total pressure loss depends on the pressure loss of the precision tube 15, making the pressure loss difference caused by the processing error between the second fuel cell stacks 3 negligible. In this embodiment, the pressure loss of the precision tube 15 is greater than the pressure loss between the first fuel outlet and the first fuel inlet, and the pressure loss of the precision tube 15 is greater than the pressure loss between the second fuel outlet 31 and the second fuel inlet 32. In some embodiments, if the precision tube 15 is only provided in the first fuel passage 1311 or the second fuel passage 1411, it is sufficient that the first fuel passage 1311 or the second fuel passage 1411 without the precision tube 15 meets the above-mentioned pressure loss requirements.

[0058] like Figure 4 As shown, the precision tube 15 includes a third inlet section 151 and a third outlet section 152. The first fuel chamber 1312 and / or the second fuel chamber 1412 are connected to the corresponding third outlet section 152. The third inlet section 151 is connected to an external fuel source. The inner diameter of the third inlet section 151 is larger than the inner diameter of the third outlet section 152.

[0059] In this embodiment, fuel enters from the third inlet section 151 and exits from the third outlet section 152 until it reaches the first fuel chamber 1312 or the second fuel chamber 1412. It is understood that an airflow distribution device 1 is provided with at least two precision tubes 15, at least one precision tube 15 is annularly welded in the first fuel passage 1311, and at least one precision tube 15 is annularly welded in the second fuel passage 1411. A transition section with a larger inner diameter is provided at the inlet of the precision tube 15 to mitigate deformation errors caused by welding.

[0060] It can also be understood that, in order to fix the precision pipe 15 in the first fuel passage 1311 or the second fuel passage 1411, the embodiment adopts the welding method, so that the precision pipe 15 is fixed, and only one end is welded in the first fuel passage 1311 or the second fuel passage 1411; since the first fuel chamber 1312 and the second fuel chamber 1412 are narrow, the third outlet section 152 is inconvenient to weld, and the embodiment adopts the welding method for the third inlet section 151, and the inner diameter of the third inlet section 151 is greater than the inner diameter of the third outlet section 152, so as to serve as a welding avoidance, prevent overheating caused by welding from causing deformation, and affect the flow passage precision of the precision pipe 15, wherein the length of the third inlet section 151 is not designed, and can meet the welding requirement. Therefore, the precision pipe 15 has an inner diameter and an outer diameter, and the outer diameter of the precision pipe 15 is less than or equal to the inner diameter of the first fuel passage 1311 (the second fuel passage 1411), and the inner diameter of the precision pipe 15 is designed according to the required fuel flow and the stack pressure drop tolerance under the standard high-temperature operating condition of the stack, and different inner diameter specifications can be selected according to the actual application requirement and the stack specification in use.

[0061] Further, the tail end of the third outlet section 152 is located inside the first fuel chamber 1312 or the second fuel chamber 1412; the length of the precision pipe 15 is greater than or equal to the length of the first fuel passage 1311, and is less than the sum of the lengths of the first fuel passage 1311 and the first fuel chamber 1312; or, the length of the precision pipe 15 is greater than or equal to the length of the second fuel passage 1411, and is less than the sum of the lengths of the second fuel passage 1411 and the second fuel chamber 1412.

[0062] The tail end of the third outlet section 152 of the precision pipe 15 of the embodiment is kept inside the first fuel chamber 1312 or the second fuel chamber 1412, and does not directly close to the inner wall of the fuel chamber, so as to prevent the gas passage from being blocked due to thermal expansion or processing error at high temperature. At the same time, the length of the precision pipe 15 is limited as described above, so as to avoid that the precision pipe 15 is too short, the pressure drop generated by the gas flowing through the precision pipe 15 is too small, and the influence caused by the stack pressure drop tolerance cannot be compensated, and the distribution target cannot be achieved; it should be noted that even if the design is modified, the same level of pressure drop is maintained in the case that the precision pipe 15 is too short, the flow rate in the pipe is too fast, the fluid characteristics tend to be compressible fluid when the sound velocity is close to the sound velocity, and the shock wave and interference are difficult to control.

[0063] In summary, the embodiment of the present application provides a kind of airflow distribution device 1 and module, by setting first supply area 13 and second supply area 14 respectively fuel to first electric pile 2 and second electric pile 3, and using isolation device 12 to separate first supply area 13 and second supply area 14, the uniform distribution of fuel intake of first electric pile 2 and second electric pile 3 can be realized;In addition, by welding replaceable precision tube 15 in first fuel channel 1311 (second fuel channel 1411), precision pressure loss pipe is welded at the inlet, so that the flow resistance of gas is similar after entering the module due to the precision tube, the pressure drop before and after the precision tube is similar, so as to be evenly distributed to first electric pile 2 and second electric pile 3, without specially processing complex distribution flow channel at the end plate of electric pile or the gas inlet of electric pile, reduce the complexity of process and the cost of electric pile preparation.

[0064] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present application, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. An air flow distribution device for air flow distribution between a first cell stack and a second cell stack arranged in a stack, characterized in that, The main body part has a waste gas exhaust structure and oppositely arranged first and second sides, the waste gas exhaust structure is in communication with the first fuel outlet of the first fuel cell and the second fuel outlet of the second fuel cell respectively, the first side is provided with a first supply area, the second side is provided with a second supply area, the first supply area and the second supply area are separated by the isolation device, the first supply area has a first fuel supply structure, the two ends of the first fuel supply structure are in communication with the first fuel inlet of the first fuel cell and the fuel source respectively, and the second supply area has a second fuel supply structure, the two ends of the second fuel supply structure are in communication with the second fuel inlet of the second fuel cell and the fuel source respectively.

2. The airflow distribution arrangement of claim 1, wherein, The first fuel supply structure comprises a first fuel channel and a first fuel chamber, the first fuel chamber is arranged correspondingly with the first fuel inlet, and the first fuel chamber circumscribes the fuel source through the first fuel channel; The second fuel supply structure comprises a second fuel channel and a second fuel chamber, the second fuel chamber is arranged correspondingly with the second fuel inlet, and the second fuel chamber circumscribes the fuel source through the second fuel channel.

3. The airflow distribution arrangement of claim 2, wherein, The pressure loss difference between the first fuel channel and the second fuel channel is not more than 10%.

4. The airflow distribution arrangement of claim 2 or 3, wherein, The pressure loss of the first fuel channel is greater than the pressure loss between the first fuel outlet and the first fuel inlet, and the pressure loss of the second fuel channel is greater than the pressure loss between the second fuel outlet and the second fuel inlet.

5. The airflow distribution arrangement of claim 4, wherein, The first fuel channel comprises a first inlet section and a first outlet section, the first outlet section is in communication with the first fuel chamber, the first inlet section circumscribes the fuel source, and the inner diameter of the first inlet section is greater than the inner diameter of the first outlet section; The second fuel channel comprises a second inlet section and a second outlet section, the second outlet section is in communication with the second fuel chamber, the second inlet section circumscribes the fuel source, and the inner diameter of the second inlet section is greater than the inner diameter of the second outlet section.

6. The airflow distribution arrangement of claim 5, wherein, The first fuel channel is partially exposed to the first fuel chamber to circumscribe the fuel source, and the tail end of the first outlet section is located inside the first fuel chamber; The second fuel channel is partially exposed to the second fuel chamber to circumscribe the fuel source, and the tail end of the second outlet section is located inside the second fuel chamber.

7. The airflow distribution arrangement of claim 2, wherein, Further comprising a plurality of precision tubes, the first fuel channel is provided with the precision tubes, one end of the precision tubes away from the first fuel chamber is in communication with the fuel source, and the pressure loss of the precision tubes is greater than the pressure loss between the first fuel outlet and the first fuel inlet; and / or, The second fuel channel is provided with the precision tubes, one end of the precision tubes away from the second fuel chamber is in communication with the fuel source, and the pressure loss of the precision tubes is greater than the pressure loss between the second fuel outlet and the second fuel inlet.

8. The airflow distribution arrangement of claim 7, wherein, The precision pipe comprises a third inlet section and a third outlet section, the first fuel chamber and / or the second fuel chamber is in communication with the corresponding third outlet section, the third inlet section circumscribes the fuel source, and the inner diameter of the third inlet section is greater than that of the third outlet section.

9. The airflow distribution arrangement of claim 8, wherein, The tail end of the third outlet section is located inside the first fuel chamber or the second fuel chamber. The length of the precision pipe is greater than or equal to the length of the first fuel passage, and less than the sum of the lengths of the first fuel passage and the first fuel chamber; or, the length of the precision pipe is greater than or equal to the length of the second fuel passage, and less than the sum of the lengths of the second fuel passage and the second fuel chamber.

10. A module characterized by The application further provides a fuel cell stack, which comprises a first fuel cell, a second fuel cell, and the gas flow distribution device as claimed in any one of claims 1-9, the first fuel cell and the second fuel cell are arranged in a stack, and the gas flow distribution device is located between the first fuel cell and the second fuel cell, two ends of the first fuel supply structure are in communication with a first fuel inlet of the first fuel cell and a fuel source respectively, two ends of the second fuel supply structure are in communication with a second fuel inlet of the second fuel cell and the fuel source respectively, and the exhaust gas discharge structure is in communication with a first fuel outlet of the first fuel cell and a second fuel outlet of the second fuel cell respectively.

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