A hydrogen circulation system for a hydrogen fuel cell

Abstract

The utility model discloses a kind of hydrogen circulation systems of hydrogen fuel cell, comprising: electric pile;Hydrogen ejector;Hydrogen supply component;Hydrogen circulation pump, its input end is communicated with the outlet end of hydrogen ejector, and the output end of hydrogen circulation pump is communicated with the hydrogen import end of electric pile, further comprising: check valve, its positive end is communicated with the outlet end of hydrogen ejector, and the reverse end of check valve is communicated with the hydrogen import end of electric pile, the check valve is parallelly connected with hydrogen circulation pump;Pipeline between the hydrogen ejector and hydrogen outlet end is additionally provided with steam-water separation component. The utility model passes through a kind of hydrogen circulation systems of hydrogen fuel cell, solves the filtration problem of existing steam-water separation device.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell technology, specifically to a hydrogen circulation system for a hydrogen fuel cell. Background Technology

[0002] During fuel cell stack operation, hydrogen enters through the anode inlet, reacts in the catalytic layer, and then exits through the anode outlet as unreacted hydrogen (containing small amounts of water vapor, nitrogen, etc.). Direct discharge not only results in low hydrogen utilization but also poses a safety risk due to excessively high hydrogen concentration in the exhaust gas. A recirculation system returns unreacted hydrogen to the anode inlet, reducing hydrogen consumption costs and effectively improving hydrogen utilization. In existing hydrogen recirculation systems, prioritizing the separation of liquid water from the circulating hydrogen is crucial for ensuring stable system operation, thus preventing liquid water from entering subsequent components and causing safety hazards.

[0003] Traditional gas-water separation devices mostly use non-removable filter structures, such as the fuel cell hydrogen circulation system and its gas-water separator (application number: CN202222539477.X). The drawback of this device is that after long-term use, impurities generated by the operation of the fuel cell may adhere to the surface of the filter element, block the pores, and reduce the hydrophobicity. This can cause liquid water to be carried to the anode of the fuel cell stack by hydrogen, leading to the risk of flooding. In addition, the entire gas-water separation unit needs to be replaced, which greatly increases the cost of use. Utility Model Content

[0004] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0005] To achieve these objectives and other advantages according to the present invention, a hydrogen recirculation system for a hydrogen fuel cell is provided, comprising: a fuel cell stack; a hydrogen ejector, the inlet end of which is connected to the hydrogen outlet end of the fuel cell stack; a hydrogen supply assembly, the gas outlet end of which is connected to the gas inlet end of the hydrogen ejector; and a hydrogen recirculation pump, the input end of which is connected to the outlet end of the hydrogen ejector, and the output end of the hydrogen recirculation pump is connected to the hydrogen inlet end of the fuel cell stack, further comprising:

[0006] A one-way valve, the forward end of which is connected to the outlet end of the hydrogen ejector, and the reverse end of the one-way valve is connected to the hydrogen inlet end of the fuel cell stack, wherein the one-way valve is connected in parallel with the hydrogen circulation pump.

[0007] A vapor-water separation assembly is also installed on the pipeline between the hydrogen ejector and the hydrogen outlet.

[0008] The gas-water separation component consists of a detachable lid and a tank body, and a detachable filter component is installed inside the tank body.

[0009] Preferably, the structure of the gas-water separation component includes:

[0010] The tank body has an inlet pipe and an outlet pipe connected to its two sides respectively. The inlet pipe is connected to the hydrogen outlet end of the fuel cell stack, and the outlet pipe is connected to the inlet end of the ejected fluid. The bottom of the tank body is also provided with a water outlet. The top surface of the tank body is provided with an annular groove and several threaded holes, and a sealing ring is added in the annular groove.

[0011] Baffle I is vertically installed in the upper half of the tank body, opposite to the air inlet pipe;

[0012] Baffle II is located in the lower half of the tank and is arranged opposite to and staggered with baffle I. The top surface of baffle II is provided with an inner groove, and protruding limiting posts are provided on both sides of the inner groove.

[0013] Filter plate I is horizontally located inside the tank and is fixedly connected to baffle I and baffle II to form a right-angled Z-shape;

[0014] Filter plate II has a protruding block on one side that matches the inner groove, and notches on both sides of the protruding block that match the protruding limiting post.

[0015] The palladium catalyst is clamped between filter plate I and filter plate II;

[0016] The can lid has an annular ring on its bottom surface that matches the annular groove, and the can lid is connected to the can body by a threaded screw.

[0017] Preferably, a triangular water guide plate is provided above the water outlet, and the edge of the water guide plate has water inlet holes distributed in a circumferential matrix.

[0018] The side of the baffle I opposite the air inlet pipe has X-shaped water inlet channels arranged in a linear matrix from top to bottom, and the outlet of the lowest end of the water inlet channel I is directly opposite the water inlet hole.

[0019] The side of the baffle II is symmetrically provided with water inlet channels II, which are composed of X-shaped and Y-shaped channels, and the outlet of the lowest end of the water inlet channel II is connected to the water inlet hole.

[0020] Preferably, the hydrogen supply assembly consists of multiple high-pressure hydrogen tanks, and a control valve is installed on the pipeline between the hydrogen supply assembly and the gas inlet of the hydrogen ejector.

[0021] This utility model has at least the following beneficial effects:

[0022] This device passively recovers circulating hydrogen using the kinetic energy of fresh hydrogen via a hydrogen ejector, reducing the load on the hydrogen circulation pump. It also utilizes the hydrogen circulation pump to actively pressurize during periods of high demand, compensating for insufficient pressure from the hydrogen ejector. A one-way valve ensures uninterrupted circulation under low load conditions while blocking reverse flow, maintaining stable system pressure. Furthermore, the detachable structure of the gas-water separation component avoids the risk of flooding caused by liquid water after prolonged use, and replacing only the filter component significantly reduces costs.

[0023] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic cross-sectional view of the gas-water separation component of this utility model;

[0026] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A;

[0027] Figure 4 This is a front sectional view of the gas-water separation component of this utility model;

[0028] The diagram is labeled as follows: 1. Fuel cell stack; 11. Hydrogen outlet; 12. Hydrogen inlet; 2. Hydrogen ejector; 21. Inlet of ejected fluid; 22. Gas inlet; 23. Outlet; 3. Hydrogen supply assembly; 31. Gas output; 4. Hydrogen circulation pump; 41. Input; 42. Output; 5. Check valve; 6. Gas-liquid separator assembly; 61. Tank; 611. Inlet pipe; 612. Outlet pipe. 613. Outlet; 614. Annular groove; 62. Baffle I; 63. Baffle II; 631. Inner groove; 632. Protruding limiting post; 64. Filter plate I; 65. Filter plate II; 651. Protruding block; 652. Notch; 66. Palladium catalyst; 67. Triangular water inlet plate; 671. Water inlet hole; 68. Water inlet groove I; 69. Water inlet groove II; 7. Tank cover; 71. Annular ring; 8. Control valve. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0030] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0031] It should be noted that in the description of this utility model, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] Furthermore, in this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] The present invention will now be described in detail with reference to the accompanying drawings:

[0035] Figure 1-4 This invention discloses a hydrogen recirculation system for a hydrogen fuel cell, comprising: a fuel cell stack 1; a hydrogen ejector 2, the inlet end 21 of which is connected to the hydrogen outlet end 11 of the fuel cell stack 1; a hydrogen supply assembly 3, the gas outlet end 31 of which is connected to the gas inlet end 22 of the hydrogen ejector 2; and a hydrogen recirculation pump 4, the input end 41 of which is connected to the outlet end 23 of the hydrogen ejector 2, and the output end 42 of the hydrogen recirculation pump 4 is connected to the hydrogen inlet end 12 of the fuel cell stack 1, and further comprising:

[0036] One-way valve 5, the forward end of which is connected to the outlet end 23 of hydrogen ejector 2, and the reverse end of one-way valve 5 is connected to the hydrogen inlet end 12 of fuel cell stack 1, and the one-way valve 5 is connected in parallel with hydrogen circulation pump 4.

[0037] A vapor-water separation assembly 6 is also installed on the pipeline between the hydrogen ejector 2 and the hydrogen outlet 11.

[0038] The gas-water separation component 6 consists of a detachable can lid 7 and a can body 61, and a detachable filter component is provided inside the can body 61.

[0039] Working principle:

[0040] Hydrogen gas in fuel cell stack 1 undergoes oxidation at the anode. Unreacted hydrogen gas is discharged from hydrogen outlet 11 and then enters the gas-water separation component 6. The gas-water separation component 6 separates the water in the hydrogen gas. The "dry circulating hydrogen gas" after completion enters the inlet 21 of the hydrogen ejector 2.

[0041] High-pressure hydrogen is supplied to the gas inlet 22 of the hydrogen ejector 2 through the gas output end 31 of the hydrogen supply component 3. The new hydrogen and the circulating hydrogen are fully mixed in the mixing chamber of the hydrogen ejector 2, and the mixed hydrogen is discharged from the outlet end 23 of the hydrogen ejector 2.

[0042] At this point, the mixed hydrogen needs to be returned to the hydrogen inlet 12 of the fuel cell stack 1 through two parallel paths, according to the power requirements of the fuel cell stack 1.

[0043] The first method: When the fuel cell stack 1 is running at high power, the one-way valve 5 is closed, and the hydrogen circulation pump 4 is started. Its input end 41 draws in the mixed hydrogen discharged from the outlet end 23 of the hydrogen ejector 2. After the mixed hydrogen is pressurized in the hydrogen circulation pump 4, it is sent to the hydrogen inlet end 12 through the output end 42 of the hydrogen circulation pump 4.

[0044] At this time, the hydrogen circulation pump 4 provides additional power to compensate for the insufficient pressure boosting capacity of the hydrogen ejector 2, ensuring that sufficient hydrogen flow enters the fuel cell stack 1 and maintains a high-power reaction.

[0045] The second scenario: When fuel cell stack 1 is operating at low power: the pressure of the mixed hydrogen discharged from the hydrogen ejector 2 is close to the inlet pressure requirement of fuel cell stack 1, requiring no additional pressurization. At this time, the one-way valve 5 opens, the hydrogen circulation pump 4 stops operating, and the mixed hydrogen directly enters the hydrogen inlet 12 of fuel cell stack 1 through the one-way valve 5. Under low power conditions, circulation is achieved by the hydrogen ejector 2 and the one-way valve 5, eliminating the need to start the hydrogen circulation pump 4 and reducing additional energy consumption.

[0046] Among them, ① because the hydrogen circulation pump 4 pressurizes the hydrogen during operation, the pressure at the output end 42 of the hydrogen circulation pump 4 will be higher than the pressure at the forward end of the one-way valve 5, and the "high pressure at the outlet" generated by the operation of the hydrogen circulation pump 4 and the "low pressure" at the outlet of the hydrogen ejector 2 form a clear pressure gradient and "reverse pressure difference".

[0047] Therefore, when the hydrogen circulation pump 4 provides pressure, it forces all the mixed hydrogen to flow through the hydrogen circulation pump 4 channel to the fuel cell stack 1, while the one-way valve 5 remains closed due to the reverse pressure difference and does not participate in fluid transport.

[0048] ② By placing the hydrogen circulation pump 4 after the hydrogen ejector 2, this device can utilize the initial pressurization of the hydrogen ejector 2 to reduce the working pressure difference of the hydrogen circulation pump 4 and improve the system's energy efficiency. This avoids the problem of the hydrogen circulation pump 4 being placed before the hydrogen ejector 2, which would require directly drawing in low-pressure circulating hydrogen and then pressing it into the hydrogen ejector 2, resulting in higher pump head requirements and greater energy consumption.

[0049] Meanwhile, the one-way valve 5 is connected in parallel with the hydrogen circulation pump 4 and placed after the hydrogen ejector 2, which can prevent the high-pressure fluid of the hydrogen circulation pump 4 from flowing back into the hydrogen ejector 2.

[0050] ③ Because the hydrogen circulation pump 4 is only responsible for pressurization and delivery, the mixed gas first passes through the hydrogen ejector 2 and then is delivered by the hydrogen circulation pump 4 to ensure that the hydrogen entering the fuel cell stack 1 is uniformly mixed.

[0051] ③ After long-term use, the filter component inside the gas-water separation component 6 can be replaced by directly opening the can lid 7 and the can body 61.

[0052] ⑤ The one-way valve 5 involved in the device can be a commercially available product.

[0053] In summary, this device passively recovers circulating hydrogen using the kinetic energy of fresh hydrogen via the hydrogen ejector 2, reducing the load on the hydrogen circulation pump 4. It also utilizes the hydrogen circulation pump 4 to actively pressurize during periods of high demand, compensating for insufficient pressure from the hydrogen ejector 2. The one-way valve 5 ensures uninterrupted circulation under low load conditions while blocking reverse flow, maintaining stable system pressure. Furthermore, the detachable structure of the gas-water separation component avoids the risk of flooding caused by liquid water after prolonged use, and replacing only the filter component significantly reduces costs.

[0054] As described above, the structure of the gas-water separation component 6 includes:

[0055] The tank body 61 has an inlet pipe 611 and an outlet pipe 612 connected to its two sides respectively. The inlet pipe 611 is connected to the hydrogen outlet end 11 of the fuel cell stack 1, and the outlet pipe 612 is connected to the inlet end 21 of the ejected fluid. The bottom of the tank body 61 is also provided with a water outlet 613. The top surface of the tank body 61 is provided with an annular groove 614 and several threaded holes, and a sealing ring is added in the annular groove 614.

[0056] Baffle I 62 is vertically installed in the upper half of the tank body 61 relative to the air inlet pipe 611;

[0057] Baffle II 63 is located in the lower half of the tank body 61 and is arranged opposite to and staggered with baffle I 62. The top surface of baffle II 63 is provided with an inner groove 631, and protruding limiting posts 632 are provided on both sides of the inner groove 631.

[0058] The filter plate I 64 is horizontally located inside the tank 61 and is fixedly connected to the baffle I 62 and the baffle II 63 to form a right-angled Z-shape.

[0059] The filter plate II 65 has a protruding block 651 on one side that matches the inner groove 631, and notches 652 on both sides of the protruding block 651 that match the protruding limiting post 632.

[0060] Palladium catalyst 66 is clamped between filter plate I 64 and filter plate II 65;

[0061] The can lid 7 has an annular ring 71 on its bottom surface that matches the annular groove 614, and the can lid 7 is connected to the can body 61 by a threaded screw.

[0062] Working principle:

[0063] The mixed gas discharged from the hydrogen outlet 11 of the fuel cell stack 1 enters the tank 61 through the inlet pipe 611. The mixed gas first impacts the vertically set baffle I 62, and the flow velocity decreases, causing larger water droplets to adhere to the surface of the baffle I 62 due to inertia, and then fall to the bottom of the tank 61 under the action of gravity.

[0064] The gas that has been initially separated by baffle I 62 continues to flow. In the lower half of the tank 61, it encounters baffle II 63, which is staggered from baffle I 62. The airflow direction changes, and the remaining small water droplets are further intercepted and slide down the surface of baffle II 63 to the bottom.

[0065] After completing two turns, the airflow passes through the transverse filter plate I 64 and enters the palladium catalyst 66. The palladium catalyst 66 can not only adsorb trace amounts of moisture, but also catalyze the reaction of residual oxygen and hydrogen, reducing impurity gases and further purifying the hydrogen. The purified gas is then further filtered through filter plate II 65 to ensure dryness and purity.

[0066] The dried and purified hydrogen enters the inlet 21 of the hydrogen ejector 2 through the outlet pipe 612 and continues to participate in the circulation; while the liquid water accumulated at the bottom of the tank 61 is discharged through the outlet 613.

[0067] Among them, ① the staggered arrangement of baffle I 62 and baffle II 63 enhances airflow disturbance and improves the steam-water separation effect.

[0068] ② After the annular ring 71 is inserted into the annular groove 614, the can lid 7 and the can body 61 are further sealed by bolts connected through the threaded holes. Moreover, the annular ring 71 of the can lid 7 will squeeze the sealing ring in the annular groove 614 of the can body 61 again, further increasing the sealing effect and preventing gas leakage.

[0069] ②The method for replacing the palladium catalyst layer 66 or cleaning filter plate I 64 and filter plate II 65 is as follows:

[0070] After opening the canister lid 7, the operator vertically removes the filter plate II 65 with the notch 652 along the direction of the protruding limiting post 632. At this time, the protruding block 651 will also slide out from the inner groove 631, thus cleaning the filter plate II 65. The palladium catalyst 66 clamped between the filter plate I 64 and the filter plate II 65 is then removed and replaced. Finally, the inner wall of the canister 61, the baffle I 62, the baffle II 63, and the filter plate I 64 are rinsed directly with water.

[0071] After cleaning the impurities inside the tank 61, the new palladium catalyst 66 is placed on the filter plate I 64. Then, the notch 652 of the filter plate II 65 is installed vertically downward along the direction of the protruding limiting post 632 until the protruding block 651 and the inner groove 631 are engaged. After replacing the sealing ring in the tank 61, the annular ring 71 is inserted into the annular groove 614. The tank 61 and the tank cover 7 are sealed by bolt connection. The overall device has a simple structure and is easy to install and replace.

[0072] As described above, a triangular water guide plate 67 is provided above the water outlet, and the edge of the water guide plate is provided with water inlet holes 671 in a circular matrix.

[0073] The side of the baffle I62 opposite to the air inlet pipe 611 has X-shaped water channels I68 arranged in a linear matrix from top to bottom, and the outlet position of the lowest end of the water channel I68 is directly opposite the water inlet hole 671.

[0074] The side of the baffle II 63 is symmetrically provided with water inlet grooves II 69, which are composed of X-shaped and Y-shaped sections, and the outlet of the lowest end of the water inlet groove II 69 is connected to the water inlet hole 671.

[0075] Working principle:

[0076] The mixed gas discharged from the hydrogen outlet 11 of the fuel cell stack 1 enters the tank 61 through the inlet pipe 611. The mixed gas first impacts the vertically set baffle I 62, and the flow velocity decreases, causing larger water droplets to adhere to the surface of the baffle I 62 due to inertia. They then flow directionally along the X-shaped water inlet channel I 68 on the baffle I 62 and finally fall from the lower outlet into the water inlet hole 671 of the water inlet plate, effectively avoiding the risk of being carried away by the gas after direct vertical sliding.

[0077] When the airflow encounters baffle II 63, which is misaligned with baffle I 62, the airflow direction changes and the remaining small water droplets are further intercepted. They flow directionally along the water guide groove II 69 on the surface of baffle II 63 and finally flow obliquely from the tail end of the Y-shape into the water inlet 671 of the water guide plate, effectively avoiding the risk of being carried away by gas after sliding directly vertically.

[0078] Among them, ① the triangular water guide plate 67 uses the inclined surface to guide the fluid to flow to the edge, avoiding the water from flowing back upward. At the same time, a water storage cavity B is formed below the triangular water guide plate 67 to collect liquid water, avoiding direct contact between the water in the water storage cavity B and the separated gas, and preventing the risk of secondary entrainment caused by the gas being sucked back into the gas channel.

[0079] ② The X-shaped water channel Ⅰ68 divides the water droplets attached to the surface of baffle Ⅰ62 into two branches (oblique to the left or oblique to the right). Combined with the linear matrix distribution from top to bottom, water droplets at different heights can quickly converge downwards along the channel, avoiding disorderly flow or stagnation of water droplets on the baffle surface.

[0080] ③ The water channel II69, composed of X-shaped and Y-shaped elements, first guides the small water droplets on the surface to the two openings at the upper end of the Y-shaped element through the X-shaped element. Finally, the droplets converge and flow into the water inlet 671 of the water inlet plate at the middle fork, thus preventing the water droplets from flowing or stagnating disorderly on the surface of the baffle.

[0081] The Y-shaped inclined section is directly connected to the water inlet 671 to form a closed water guiding channel. When the water flows into the water inlet 671 along the inclined surface, it directly avoids contact with the surrounding airflow, reducing the risk of entrainment.

[0082] In summary, the X+Y combined structure of the water inlet channel II69 addresses the problem of difficulty in collecting small water droplets after separation, and eliminates the risk of secondary entrainment through a closed path.

[0083] In the above scheme, the hydrogen supply component 3 is composed of multiple high-pressure hydrogen tanks, and a control valve 8 is installed on the pipeline between the hydrogen supply component 3 and the gas inlet of the hydrogen ejector 2.

[0084] Working principle:

[0085] When the system requires hydrogen, control valve 8 is opened. Hydrogen in the high-pressure hydrogen tank, relying on its own pressure difference, is supplied to the hydrogen ejector 2 through gas output terminal 31, providing a stable hydrogen source for the system. Control valve 8 is designed to prevent high-pressure hydrogen from directly impacting the hydrogen ejector 2, effectively regulating the pressure of the output hydrogen.

[0086] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A hydrogen circulation system for a hydrogen fuel cell, comprising: fuel cell stack; The hydrogen ejector has its inlet end connected to the hydrogen outlet end of the fuel cell stack. A hydrogen supply assembly, the gas output end of which is connected to the gas inlet end of a hydrogen ejector; a hydrogen circulation pump, the input end of which is connected to the outlet end of the hydrogen ejector, and the output end of the hydrogen circulation pump being connected to the hydrogen inlet end of the fuel cell stack, characterized in that it further includes: A one-way valve, the forward end of which is connected to the outlet end of the hydrogen ejector, and the reverse end of the one-way valve is connected to the hydrogen inlet end of the fuel cell stack, wherein the one-way valve is connected in parallel with the hydrogen circulation pump. A vapor-water separation assembly is also installed on the pipeline between the hydrogen ejector and the hydrogen outlet. The gas-water separation component consists of a detachable lid and a tank body, and a detachable filter component is installed inside the tank body.

2. The hydrogen circulation system of a hydrogen fuel cell according to claim 1, characterized by, The steam-water separation component includes: The tank body has an inlet pipe and an outlet pipe connected to its two sides respectively. The inlet pipe is connected to the hydrogen outlet end of the fuel cell stack, and the outlet pipe is connected to the inlet end of the ejected fluid. The bottom of the tank body is also provided with a water outlet. The top surface of the tank body is provided with an annular groove and several threaded holes, and a sealing ring is added in the annular groove. Baffle I is vertically installed in the upper half of the tank body, opposite to the air inlet pipe; Baffle II is located in the lower half of the tank and is arranged opposite to and staggered with baffle I. The top surface of baffle II is provided with an inner groove, and protruding limiting posts are provided on both sides of the inner groove. Filter plate I is horizontally located inside the tank and is fixedly connected to baffle I and baffle II to form a right-angled Z-shape; Filter plate II has a protruding block on one side that matches the inner groove, and notches on both sides of the protruding block that match the protruding limiting post. The palladium catalyst is clamped between filter plate I and filter plate II; The can lid has an annular ring on its bottom surface that matches the annular groove, and the can lid is connected to the can body by a threaded screw.

3. The hydrogen circulation system of a hydrogen fuel cell according to claim 2, characterized by A triangular water guide plate is provided above the water outlet, and the edge of the water guide plate has water inlet holes distributed in a circular matrix. The side of the baffle I opposite the air inlet pipe has X-shaped water inlet channels arranged in a linear matrix from top to bottom, and the outlet of the lowest end of the water inlet channel I is directly opposite the water inlet hole. The side of the baffle II is symmetrically provided with water inlet channels II, which are composed of X-shaped and Y-shaped channels, and the outlet of the lowest end of the water inlet channel II is connected to the water inlet hole.

4. The hydrogen circulation system of a hydrogen fuel cell according to claim 1, characterized by, The hydrogen supply assembly consists of multiple high-pressure hydrogen tanks, and a control valve is installed on the pipeline between the hydrogen supply assembly and the gas inlet of the hydrogen ejector.

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