Tubular metal hydride hydrogen storage tank

Abstract

The utility model discloses a tubular metal hydride hydrogen storage tank, which belongs to the technical field of hydrogen storage and comprises a support seat, a central heat exchange tube, an outer winding heat exchange pipeline, a hydrogen storage long tank, a hydrogen inlet and a hydrogen outlet. Supporting seats are fixedly mounted at the two ends of the long hydrogen storage tank respectively, and hydrogen storage alloy powder is filled in the long hydrogen storage tank; the central heat exchange tube is arranged in the hydrogen storage long tank; the outer winding heat exchange pipeline is wound on the outer wall of the long hydrogen storage tank and is propped against the long hydrogen storage tank; the section of the outer winding heat exchange pipeline is semicircular; the winding directions of the adjacent outer winding heat exchange pipelines are opposite; a hydrogen inlet is formed in one end of the hydrogen storage long tank, and a hydrogen outlet is formed in the other end; and a central heat exchange pipe water outlet of the central heat exchange pipe and a winding pipe water inlet of the outer winding heat exchange pipeline are positioned on the same side of the hydrogen storage long tank. By designing the inner and outer heat exchange systems, heat exchange of the hydrogen storage alloy powder is facilitated, and the hydrogen absorption and desorption rate is increased.

Description

Technical Field

[0001] This utility model belongs to the field of hydrogen storage technology, and specifically relates to a tubular metal hydride hydrogen storage tank. Background Technology

[0002] The use of fossil fuels such as coal, oil, and natural gas causes environmental damage, including the greenhouse effect and geological subsidence. Furthermore, fossil fuel reserves are finite and non-renewable. Hydrogen, as a clean and efficient secondary energy source, is considered an ideal alternative to traditional fossil fuels. In hydrogen energy systems, the safe storage of hydrogen is the most critical aspect.

[0003] Hydrogen storage technology, a crucial link in the production and utilization of hydrogen, refers to the technology of storing hydrogen in a stable form of energy for convenient use. The mass energy density of hydrogen is approximately 120 MJ / kg, which is 2.7 times that of gasoline, diesel, and natural gas.

[0004] Hydrogen storage and transportation commonly utilize two methods: high-pressure gaseous storage and cryogenic liquid storage. High-pressure gaseous hydrogen storage is currently the most prevalent method for industrial hydrogen storage and transportation, offering high mass hydrogen storage density, but its high pressure poses significant safety risks. Cryogenic liquid hydrogen storage boasts extremely high mass and volumetric hydrogen storage density, but requires an additional cooling system (cooling to -253°C), consuming substantial energy during the cooling process. Furthermore, liquid hydrogen is highly volatile during storage and transportation, making long-term preservation difficult. From both safety and economic perspectives, both of these hydrogen storage methods require further development. Solid-state hydrogen storage is a novel technology that stores hydrogen in solid storage materials. It offers advantages such as high volumetric hydrogen storage density, convenient storage and transportation, and good safety performance, and is considered the most promising hydrogen storage method. However, existing solid-state hydrogen storage devices are primarily miniaturized, with few large and medium-sized devices, limiting the development of this technology. Simultaneously, the development of solid-state hydrogen storage devices faces challenges such as slow hydrogen storage / desorption rates, low heat exchange efficiency, uneven internal temperature, low storage pressure, and low safety. Therefore, there is an urgent need to develop a new, highly efficient heat exchange hydrogen storage device. Utility Model Content

[0005] To address the aforementioned problems, this utility model discloses a tubular metal hydride hydrogen storage tank, comprising: a support base, a central heat exchange tube, an outer heat exchange pipeline, a long hydrogen storage tank, a hydrogen inlet, and a hydrogen outlet;

[0006] The hydrogen storage tank is fixedly installed with support bases at both ends, and is filled with hydrogen storage alloy powder.

[0007] The central heat exchange tube is installed inside the hydrogen storage tank.

[0008] The external heat exchange pipeline is coiled around the outer wall of the hydrogen storage tank, and the two abut against each other; the cross-section of the external heat exchange pipeline is semi-circular;

[0009] The adjacent external heat exchange pipes are wound in opposite directions;

[0010] The hydrogen storage tank has a hydrogen inlet at one end and a hydrogen outlet at the other end.

[0011] The outlet of the central heat exchanger tube and the inlet of the outer heat exchanger tube are both located on the same side of the hydrogen storage tank.

[0012] Furthermore, the central heat exchanger tube inlet and the outer heat exchanger tube outlet are both located on the other side of the hydrogen storage tank.

[0013] Furthermore, the central heat exchange tube also includes: a water pipe, a heat exchange tube support ring, and first heat exchange tube fins;

[0014] The water pipe is provided with several heat exchange tube support rings at intervals;

[0015] The outer wall of the water pipe is provided with several first heat exchange tube fins spaced apart circumferentially.

[0016] The first heat exchange tube has plate-shaped fins, which are longitudinal fins.

[0017] Furthermore, the distance between the heat exchanger tube support rings is in the range of 500-1200mm.

[0018] Furthermore, the central heat exchange tube includes multiple water pipes and a second heat exchange tube fin.

[0019] The multiple water pipes are arranged in parallel, forming a ring shape.

[0020] A second heat exchange tube fin is provided on the outer wall of the water pipe;

[0021] The second heat exchange tube has spiral fins.

[0022] Furthermore, the central heat exchange tube includes a circular tube, a third heat exchange tube fin, a fourth heat exchange tube fin, and a support tube;

[0023] The circular tube is installed inside the long hydrogen storage tank, and the outer wall of the circular tube abuts against the inner wall of the long hydrogen storage tank.

[0024] The support tube is located at the center of the circular tube;

[0025] The sidewall of the support tube is provided with a plurality of third heat exchange tube fins spaced apart circumferentially; one side of the third heat exchange tube fins is fixedly installed on the support tube, and the other side is fixedly installed on the inner wall of the circular tube.

[0026] A plurality of fourth heat exchange tube fins are provided at intervals between the third heat exchange tube fins.

[0027] The fourth heat exchange tube fin is fixedly installed on one side of the inner wall of the round tube.

[0028] Furthermore, both the third and fourth heat exchange tube fins are plate-shaped and have the same length;

[0029] The width of the third heat exchange tube fin is greater than the width of the fourth heat exchange tube fin.

[0030] Furthermore, it also includes: a loading port flange;

[0031] The hydrogen storage tank is fixedly equipped with a loading port flange at one end.

[0032] Furthermore, the hydrogen outlet is located on the loading port flange.

[0033] Furthermore, it also includes: valves;

[0034] Both the hydrogen inlet and the hydrogen outlet are equipped with valves.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] 1. This utility model sets up a tubular filling alloy powder unit in the hydrogen storage tank, and the number of hydrogen storage tanks can be adjusted according to the hydrogen storage quality requirements. The stacking device reduces the floor space and can meet the hydrogen storage requirements of different quality specifications.

[0037] 2. This utility model, through the design of an internal and external heat exchange system, facilitates the heat exchange of hydrogen storage alloy powder, improves the hydrogen absorption and desorption rate, and the central heat exchange tube is a single long tube, reducing the risk of pipeline leakage.

[0038] 3. This utility model facilitates the loading and unloading of alloy powder by designing a loading port flange, and the hydrogen outlet and loading port are shared, which reduces the number of tank openings and improves the pressure applicable range of the device.

[0039] 4. This utility model reduces the unevenness of the internal reaction by having the inlet and outlet water of the internal and external heat exchange systems on different sides, thereby increasing the safety and performance of the device.

[0040] 5. It adopts a modular design, which facilitates maintenance and can safely and effectively store more hydrogen.

[0041] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A schematic diagram of the structure of a tubular metal hydride hydrogen storage tank according to an embodiment of the present invention is shown. Figure 1 ;

[0044] Figure 2 A schematic diagram of the structure of a tubular metal hydride hydrogen storage tank according to an embodiment of the present invention is shown. Figure 2 ;

[0045] Figure 3 A front view of a tubular metal hydride hydrogen storage tank according to an embodiment of the present invention is shown;

[0046] Figure 4 A top view of a tubular metal hydride hydrogen storage tank according to an embodiment of the present invention is shown;

[0047] Figure 5 A schematic diagram of the structure of the central heat exchange tube according to an embodiment of the present invention is shown. Figure 1 ;

[0048] Figure 6 A schematic diagram of the structure of the central heat exchange tube according to an embodiment of the present invention is shown. Figure 2 ;

[0049] Figure 7 A schematic diagram of the structure of the central heat exchange tube according to an embodiment of the present invention is shown. Figure 3 .

[0050] Reference numerals in the attached diagram: 1. Support base; 2. Central heat exchange tube; 21. Central heat exchange tube inlet; 22. Central heat exchange tube outlet; 23. Heat exchange tube support ring; 24. First heat exchange tube fin; 3. Outer heat exchange pipeline; 31. Outer tube inlet; 32. Outer tube outlet; 4. Hydrogen storage tank; 5. Hydrogen inlet; 6. Hydrogen outlet; 7. Loading port flange; 8. Water pipe; 9. Second heat exchange tube fin; 10. Circular tube; 11. Third heat exchange tube fin; 12. Fourth heat exchange tube fin; 13. Support tube. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0052] Figure 1 A schematic diagram of the structure of a tubular metal hydride hydrogen storage tank according to an embodiment of the present invention is shown. Figure 1 .like Figure 1 and Figure 2 As shown, the present invention proposes a tubular metal hydride hydrogen storage tank, comprising: a support base 1, a central heat exchange tube 2, an outer heat exchange pipeline 3, a long hydrogen storage tank 4, a hydrogen inlet 5, and a hydrogen outlet 6.

[0053] The hydrogen storage tank 4 is fixedly installed with support bases 1 at both ends; the hydrogen storage tank 4 has a hydrogen storage alloy storage space inside, which is filled with hydrogen storage alloy powder; for example, the hydrogen storage tank 4 is welded to the support base 1.

[0054] For example, the two support bases 1 bear the weight of the hydrogen storage tank 4 and the hydrogen storage alloy inside. The support bases 1 are provided with positioning holes on their sides, which can realize convenient docking and integration of multiple hydrogen storage tanks 4.

[0055] The central heat exchange tube 2 is installed inside the hydrogen storage tank 4 to remove heat when the hydrogen storage alloy absorbs hydrogen and to provide heat to the hydrogen storage alloy when it releases hydrogen. One end of the central heat exchange tube 2 is provided with a central heat exchange tube inlet 21 and the other end is provided with a central heat exchange tube outlet 22.

[0056] The external heat exchange pipeline 3 is coiled around the outer wall of the hydrogen storage tank 4, and the two abut against each other; the cross-section of the external heat exchange pipeline 3 is semi-circular, with a coiled inlet 31 at one end and a coiled outlet 32 ​​at the other end.

[0057] The outer heat exchange pipes 3 of adjacent tanks are wound in opposite directions; for example, the outer heat exchange pipes 3 on one hydrogen storage tank 4 are wound clockwise, and the outer heat exchange pipes 3 on adjacent hydrogen storage tanks 4 are wound counterclockwise. The opposite winding direction of the outer heat exchange pipes 3 on both sides can make the inlet and outlet tee pipes of the outer heat exchange pipes 3 located in the middle of the adjacent tanks, which simplifies the difficulty of pipe layout and facilitates pipe assembly.

[0058] The hydrogen storage tank 4 is provided with a hydrogen inlet 5 at one end and a hydrogen outlet 6 at the other end.

[0059] like Figure 3As shown, the central heat exchanger outlet 22 of the central heat exchanger 2 and the inlet 31 of the outer heat exchanger 3 are both located on the left side of the hydrogen storage tank 4.

[0060] like Figure 4 As shown, the central heat exchanger tube inlet 21 of the central heat exchanger tube 2 and the outer heat exchanger tube outlet 32 ​​are both located on the right side of the hydrogen storage tank 4.

[0061] In the outer heat exchanger pipe 3, water flows from the inlet 31 to the outlet 32, while in the central heat exchanger pipe 2, water flows from the inlet 21 to the outlet 22. The water flow directions of the inner and outer heat exchanger pipes are opposite.

[0062] This water circuit design can reduce the uneven temperature of the metal alloy powder inside the hydrogen storage tank 4, thereby reducing the unevenness of the internal reaction, increasing the safety and performance of the device, ensuring the heat exchange required for hydrogen absorption / desorption by the metal alloy powder inside the hydrogen storage tank 4, and thus improving the rate of hydrogen absorption / desorption.

[0063] Preferably, the single hydrogen storage tank 4 has a sealable structure, with a circulating heat exchange system connection, inlet and outlet gas pipelines, and finally a pipeline junction.

[0064] Preferably, the hydrogen inlet 5 and the hydrogen outlet 6 are connected by separate gas pipelines; when filling with hydrogen, the hydrogen outlet 6 valve is closed; when releasing hydrogen, the hydrogen inlet 5 valve is closed.

[0065] This utility model's tubular metal hydride hydrogen storage tank achieves high hydrogen storage density while allowing for long-term use in a hydrogen atmosphere. It can withstand temperature changes caused by hydrogen absorption and desorption, bear its own weight to prevent significant deformation during use, and can be designed for high pressure operation, enabling long-term hydrogen absorption and desorption cycles under varying hydrogen pressures, maintaining safety, reliability, and sustainability. The tubular design provides a new approach for future large-scale solid-state hydrogen storage devices.

[0066] This invention incorporates a tubular filling alloy powder unit within the hydrogen storage tank. The number of hydrogen storage tanks 4 can be adjusted according to the required hydrogen storage quality. The stacking device reduces the floor space required, enabling the storage of hydrogen of different quality specifications. The modular design facilitates maintenance and allows for the safe and efficient storage of more hydrogen.

[0067] like Figure 5 As shown, in some embodiments, the central heat exchange tube 2 further includes: a water pipe 8, a heat exchange tube support ring 23, and a first heat exchange tube fin 24;

[0068] The water pipe 8 is located at the center of the hydrogen storage tank 4.

[0069] The water pipe 8 is provided with several heat exchange tube support rings 23 at intervals to reduce the risk of the central heat exchange tube 2 being squeezed and deformed by alloy powder; for example, three heat exchange tube support rings 23 are provided.

[0070] The outer wall of the water pipe 8 is provided with a plurality of first heat exchange tube fins 24 spaced apart in the circumferential direction; for example, eight first heat exchange tube fins 24 are provided.

[0071] The first heat exchange tube fin 24 is plate-shaped and longitudinally oriented. The length direction of the first heat exchange tube fin 24 is parallel to the axial direction of the central heat exchange tube 2.

[0072] In some embodiments, the distance between the heat exchanger tube support ring 23 and the heat exchanger tube support ring 24 is in the range of 500-1200 mm. Preferably, the distance between the heat exchanger tube support ring 23 and the heat exchanger tube support ring 24 is 900 mm.

[0073] like Figure 6 As shown, in some other design configurations, the central heat exchange tube 2 includes multiple water pipes 8 and a second heat exchange tube fin 9.

[0074] Multiple water pipes 8 are arranged in parallel and parallel to each other, forming a ring shape; one end of the multiple water pipes 8 converges to form the central heat exchange pipe inlet 21, and the other end converges to form the central heat exchange pipe outlet 22; for example, five water pipes 8 are arranged in parallel.

[0075] The outer wall of the water pipe 8 is provided with a second heat exchange tube fin 9;

[0076] The second heat exchange tube fin 9 is spiral-shaped, which can prevent the accumulation of hydrogen storage alloy powder inside the hydrogen storage tank, reduce the impact of hydrogen absorption and expansion of the hydrogen storage alloy powder on the central heat exchange tube 2, reduce the risk of the central heat exchange tube 2 being damaged due to the expansion and compression of the hydrogen storage alloy powder, and improve the operational stability of the hydrogen storage tank.

[0077] The central heat exchanger tube 2 is designed with multiple water pipes 8, which can improve the efficiency of heat exchange and heating.

[0078] like Figure 7 As shown, in some other design configurations, the central heat exchange tube 2 includes a circular tube 10, a third heat exchange tube fin 11, a fourth heat exchange tube fin 12, and a support tube 13.

[0079] The circular tube 10 is installed inside the hydrogen storage tank 4, and the outer wall of the circular tube 10 abuts against the inner wall of the hydrogen storage tank 4.

[0080] The support tube 13 is located at the center of the circular tube 10;

[0081] The side wall of the support tube 13 is provided with a plurality of third heat exchange tube fins 11 spaced apart in the circumferential direction; one side of the third heat exchange tube fin 11 is fixedly installed on the support tube 13, and the other side is fixedly installed on the inner wall of the circular tube 10.

[0082] A plurality of fourth heat exchange tube fins 12 are provided at intervals between the third heat exchange tube fins 11 and the third heat exchange tube fins 11.

[0083] The fourth heat exchange tube fin 12 is fixedly installed on one side of the inner wall of the round tube 10.

[0084] The internal heat is transferred to the circular tube 10 through the third heat exchange tube fin 11 and the fourth heat exchange tube fin 12, and then the circular tube 10 transfers the heat to the hydrogen storage tank 4, thereby removing the internal heat.

[0085] The elimination of the central water pipe 8 completely avoids the impact of alloy powder expansion on the water pipe 8, preventing the pipe 8 from rupturing due to expansion and pressure, causing circulating water to flow into the tank and resulting in the failure of the hydrogen storage alloy powder. At the same time, to compensate for the loss of heat exchange caused by the elimination of the central water pipe 8, the third heat exchange tube fins 11 are extended into the support tube 13, so that the heat in the central part can be conducted to the circular tube 10, enhancing the heat exchange efficiency. Meanwhile, the support tube 13 can also prevent the central hydrogen storage alloy powder from accumulating and can also be used as a central vent pipe to increase the contact area between hydrogen and hydrogen storage alloy powder.

[0086] Although the above description uses the three structures of the central heat exchange tube 2 as examples, this utility model is not limited to these. The structure of the central heat exchange tube 2 can be designed in various forms, such as spiral fins, spiral coils, composite heat exchange structures, etc. The heat exchange structure can be modified according to actual use needs to improve the adaptability of the device to application scenarios.

[0087] In some embodiments, the third heat exchange tube fin 11 and the fourth heat exchange tube fin 12 are both plate-shaped and have the same length;

[0088] The width of the third heat exchange tube fin 11 is greater than the width of the fourth heat exchange tube fin 12.

[0089] like Figure 2 As shown, in some embodiments, the tubular metal hydride hydrogen storage tank further includes: a filling port flange 7;

[0090] The hydrogen storage tank 4 has a loading port flange 7 fixedly installed at one end.

[0091] In some embodiments, the hydrogen outlet 6 is located on the loading port flange 7.

[0092] The loading port and hydrogen outlet 6 are designed with flange structures. After the hydrogen storage alloy powder is filled, the flange is connected to seal the chamber of the long hydrogen storage tank 4. The loading port flange 7 is designed to facilitate the loading and unloading of alloy powder, and the hydrogen outlet 6 is shared with the loading port, which reduces the number of openings in the tank and improves the pressure range applicable to the device.

[0093] In some embodiments, the tubular metal hydride hydrogen storage tank further includes: a valve;

[0094] Both the hydrogen inlet 5 and the hydrogen outlet 6 are equipped with valves.

[0095] A method for storing hydrogen in a tubular metal hydride hydrogen storage tank includes the following steps:

[0096] Hydrogen absorption process: Open hydrogen inlet 5 and close hydrogen outlet 6. Hydrogen enters the hydrogen storage tank 4 through hydrogen inlet 5 and reacts fully with the hydrogen storage alloy until the hydrogen storage tank 4 is full.

[0097] During hydrogen absorption, cooled circulating medium is introduced into the central heat exchange tube inlet 21 and the external coil inlet 31 to remove the heat released by the hydrogen storage alloy during hydrogen absorption.

[0098] Hydrogen release process: Close hydrogen inlet 5 and open hydrogen outlet 6. The gaseous hydrogen stored in the hydrogen storage tank is released first. Hot water is introduced into the circulating heat exchange system to heat the hydrogen storage alloy powder, and the hydrogen in the metal hydride begins to be released.

[0099] During hydrogen release, heated circulating medium is introduced into the central heat exchange tube inlet 21 and the external winding tube inlet 31 to meet the heat absorption requirements of the hydrogen storage alloy.

[0100] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tubular metal hydride hydrogen storage tank, characterized in that, include: Support base (1), central heat exchange tube (2), outer heat exchange pipeline (3), hydrogen storage tank (4), hydrogen inlet (5) and hydrogen outlet (6); The hydrogen storage tank (4) is fixedly installed with support bases (1) at both ends, and is filled with hydrogen storage alloy powder. The central heat exchange tube (2) is installed inside the hydrogen storage tank (4); The external heat exchange pipeline (3) is coiled around the outer wall of the hydrogen storage tank (4), and the two abut against each other; the cross-section of the external heat exchange pipeline (3) is semi-circular; The adjacent external heat exchange pipes (3) are wound in opposite directions; The hydrogen storage tank (4) is provided with a hydrogen inlet (5) at one end and a hydrogen outlet (6) at the other end; The central heat exchange tube outlet (22) of the central heat exchange tube (2) and the inlet (31) of the outer heat exchange tube (3) are both located on the same side of the hydrogen storage tank (4).

2. The tubular metal hydride hydrogen storage tank according to claim 1, characterized in that, The central heat exchanger inlet (21) of the central heat exchanger (2) and the outer heat exchanger outlet (32) of the outer heat exchanger (3) are both located on the other side of the hydrogen storage tank (4).

3. The tubular metal hydride hydrogen storage tank according to claim 1 or 2, characterized in that, The central heat exchange tube (2) also includes: a water pipe (8), a heat exchange tube support ring (23), and a first heat exchange tube fin (24); Several heat exchange tube support rings (23) are provided at intervals on the water pipe (8); The outer wall of the water pipe (8) is provided with a number of first heat exchange tube fins (24) spaced apart in the circumferential direction; The first heat exchange tube fin (24) is plate-shaped and is a longitudinal fin.

4. The tubular metal hydride hydrogen storage tank according to claim 3, characterized in that, The distance between the heat exchange tube support ring (23) and the heat exchange tube support ring (23) is in the range of 500-1200mm.

5. The tubular metal hydride hydrogen storage tank according to claim 1, characterized in that, The central heat exchange tube (2) includes multiple water pipes (8) and a second heat exchange tube fin (9); Multiple water pipes (8) are arranged in parallel, forming a ring shape; The water pipe (8) is provided with a second heat exchange tube fin (9) on its outer wall; The second heat exchange tube fins (9) are spiral-shaped.

6. The tubular metal hydride hydrogen storage tank according to claim 1, characterized in that, The central heat exchange tube (2) includes a circular tube (10), a third heat exchange tube fin (11), a fourth heat exchange tube fin (12), and a support tube (13); The circular tube (10) is installed inside the hydrogen storage tank (4), and the outer wall of the circular tube (10) abuts against the inner wall of the hydrogen storage tank (4); The support tube (13) is located at the center of the circular tube (10); The sidewall of the support tube (13) is provided with a plurality of third heat exchange tube fins (11) spaced apart in the circumferential direction; one side of the third heat exchange tube fins (11) is fixedly installed on the support tube (13), and the other side is fixedly installed on the inner wall of the round tube (10); A plurality of fourth heat exchange tube fins (12) are provided at intervals between the third heat exchange tube fins (11); The fourth heat exchange tube fin (12) is fixedly installed on one side of the inner wall of the round tube (10).

7. The tubular metal hydride hydrogen storage tank according to claim 6, characterized in that, The third heat exchange tube fin (11) and the fourth heat exchange tube fin (12) are both plate-shaped and have the same length; The width of the third heat exchange tube fin (11) is greater than the width of the fourth heat exchange tube fin (12).

8. The tubular metal hydride hydrogen storage tank according to claim 1, characterized in that, Also includes: Filling port flange (7); A loading port flange (7) is fixedly installed at one end of the hydrogen storage tank (4).

9. The tubular metal hydride hydrogen storage tank according to claim 8, characterized in that, The hydrogen outlet (6) is located on the loading port flange (7).

10. The tubular metal hydride hydrogen storage tank according to claim 1, characterized in that, Also includes: valve; Both the hydrogen inlet (5) and the hydrogen outlet (6) are equipped with valves.

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