Solid hydrogen and heat storage device

Abstract

The utility model relates to the technical field of hydrogen storage, in particular to a solid hydrogen and heat storage device which comprises a storage tank, a pipe fitting supporting disc, a pipe fitting, a heating component, a solid hydrogen storage material and a phase change material, and a hydrogen inlet and a hydrogen outlet are formed in the storage tank; the pipe fitting supporting disc is arranged in the storage tank, a mounting hole is formed in the pipe fitting supporting disc, the pipe fitting is inserted into the mounting hole, the solid hydrogen storage material is arranged in the pipe fitting, and an opening is formed in the pipe fitting; a phase-change material filling space is formed between the pipe fitting and the storage tank, and the phase-change material is arranged in the phase-change material filling space; the heating component is arranged on the pipe fitting and used for heating the solid hydrogen storage material in the pipe fitting. According to the hydrogen and heat storage device integrating the solid hydrogen storage material and the phase change heat storage material, hydrogen charging and discharging in the same place or in different places can be achieved by using the device, cooling or heating equipment does not need to be additionally arranged, the energy utilization rate of the whole system is effectively increased, and meanwhile the complexity of the system is greatly reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the hydrogen storage field, in particular to a solid-state hydrogen storage and heat storage device. BACKGROUND

[0002] With the global emphasis on reducing carbon emissions and addressing climate change, the world is transitioning to a low-carbon or zero-carbon energy system; hydrogen energy storage technology, as a new energy storage method, has received more and more attention in recent years. Magnesium-based solid-state hydrogen storage technology is a very promising direction in the field of hydrogen energy storage, which mainly uses magnesium (Mg) or magnesium-based alloys to react with hydrogen to generate stable metal hydrides to achieve hydrogen storage. Magnesium-based solid-state hydrogen storage materials have the advantages of low cost, high hydrogen storage density, and easy transportation.

[0003] However, there are still some challenges in practical application: during the hydrogen charging process of magnesium-based materials, a large amount of reaction heat needs to be removed in time, while during the hydrogen discharging process, heat needs to be continuously provided for the hydrogen discharging process, and the reaction heat temperature during the hydrogen charging and discharging processes is relatively high (260℃-400℃). In the traditional solid-state hydrogen storage system, cooling or heating equipment needs to be added in the external system of the solid-state hydrogen storage container to match the heat management of hydrogen charging and discharging, which causes the complexity of the system and causes a large amount of heat energy loss, and the effective utilization rate of heat is low. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the application is to provide a solid-state hydrogen storage and heat storage device, which solves the technical problem of the complexity of the system and the large amount of heat energy loss and the low effective utilization rate of heat in the traditional solid-state hydrogen storage system, which needs to add cooling or heating equipment in the external system of the solid-state hydrogen storage container to match the heat management of hydrogen charging and discharging.

[0005] The application provides a solid-state hydrogen storage and heat storage device, which comprises a storage tank, a pipe support disc, a pipe, a heating component, a solid-state hydrogen storage material and a phase change material; wherein the storage tank is formed with a hydrogen inlet and a hydrogen outlet; the pipe support disc is arranged in the storage tank, the pipe support disc is formed with a mounting hole, the pipe is inserted into the mounting hole, the solid-state hydrogen storage material is arranged in the pipe, and the pipe is formed with an opening;

[0006] The pipe and the storage tank form a phase change material filling space, and the phase change material is arranged in the phase change material filling space; the heating component is arranged in the pipe and is used for heating the solid-state hydrogen storage material in the pipe.

[0007] In the above technical solution, further, the pipe support disc includes a bottom pipe support disc, and is arranged at the bottom of the pipe along the height direction of the pipe, and along the height direction of the storage tank, the bottom pipe support disc divides the inside of the storage tank into a first space and a second space, and the pipe is arranged in the first space; the second space is also provided with the phase change material; the bottom pipe support disc is formed with a communication hole, and the first space and the second space are communicated through the communication hole.

[0008] In any of the above technical solutions, further, the storage tank is formed with a first phase change material discharge port communicated with the first space.

[0009] In any of the above technical solutions, further, the storage tank is formed with a second phase change material discharge port communicated with the second space.

[0010] In any of the above technical solutions, further, along the height direction of the pipe, the opening is formed at the top of the pipe, and a hydrogen distribution space is formed between the top opening of the pipe and the inner top wall of the storage tank.

[0011] In any of the above technical solutions, further, the pipe support disc includes a top pipe support disc, and is arranged at the top of the pipe along the height direction of the pipe.

[0012] In any of the above technical solutions, further, the solid-state hydrogen storage and heat storage device further comprises a heat preservation layer, and the heat preservation layer is arranged outside the storage tank.

[0013] In any of the above technical solutions, further, the number of mounting holes is multiple, and is uniformly distributed on the pipe support disc.

[0014] The number of pipes is also multiple, and corresponds to the mounting holes one by one.

[0015] In any of the above technical solutions, further, the pipe and the pipe support disc are connected by welding.

[0016] In any of the above technical solutions, further, the pipe support disc and the storage tank are connected by welding.

[0017] In any of the above technical solutions, further, the storage tank includes a tank body and a top cover; wherein the top of the tank body along the height direction thereof is formed with an opening, and the top cover is detachably mounted at the opening end of the tank body; the hydrogen inlet and the hydrogen outlet are formed in the top cover.

[0018] In any of the above technical solutions, further, the solid-state hydrogen storage and heat storage device further comprises a thermocouple, and the thermocouple is fixed to the tank body, and a detection end of the thermocouple extends into the solid-state hydrogen storage material in the pipe.

[0019] In any of the above technical solutions, further, the tank is formed with a phase change material adding port, and the phase change material adding port is provided with a detachable sealing cover; and / or the heating member is arranged on the outer wall of the pipe.

[0020] In any of the above technical solutions, further, the heating member is an electric heating wire.

[0021] In any of the above technical solutions, further, the height direction of the pipe is the same as the height direction of the tank.

[0022] In any of the above technical solutions, further, the hydrogen inlet and the hydrogen outlet are the same opening end.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] The application provides a hydrogen storage and heat storage device integrating solid-state hydrogen storage material such as magnesium-based hydrogen storage material and phase change heat storage material, which can realize hydrogen charging and discharging on the same site or different sites without additional cooling or heating equipment, realizes heat coupling and recycling of hydrogen charging and discharging of the solid-state hydrogen storage material such as magnesium-based hydrogen storage material, effectively improves the energy utilization rate of the whole system, greatly reduces the complexity of the system, and saves the equipment investment and a large amount of operation cost of the system. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0026] Figure 1 The structural schematic diagram of the solid-state hydrogen storage and heat storage device provided by the embodiments of the application is shown in the figure.

[0027] Figure 2 The structural schematic diagram of the pipe support disc provided by the embodiments of the application is shown in the figure.

[0028] Reference signs:

[0029] 1 - tank, 11 - tank body, 12 - top cover, 13 - first space, 14 - second space, 15 - first phase change material discharge port, 16 - second phase change material discharge port, 17 - phase change material addition port, 18 - hydrogen inlet and outlet, 2 - pipe support disc, 21 - bottom pipe support disc, 22 - top pipe support disc, 23 - mounting hole, 3 - pipe, 4 - heating member, 5 - phase change material filling space, 6 - thermal insulation layer, 7 - thermocouple. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments of the present application.

[0031] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application.

[0032] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0035] The solid-state hydrogen storage and heat storage device according to some embodiments of the present application will be described below with reference to Figure 1 and Figure 2

[0036] Referring to Figure 1 ​and Figure 2 As shown in the drawings, the embodiment of the present application provides a solid-state hydrogen storage and heat storage device, which comprises a storage tank 1, a pipe support disc 2, a pipe 3, a heating component 4, a solid-state hydrogen storage material and a phase change material; wherein the storage tank 1 is formed with a hydrogen inlet and a hydrogen outlet; the pipe support disc 2 is arranged in the storage tank 1, the pipe support disc 2 is formed with a mounting hole 23, the pipe 3 is inserted into the mounting hole 23, the solid-state hydrogen storage material is arranged in the pipe 3, and the pipe 3 is formed with an opening.

[0037] The pipe 3 and the storage tank 1 are formed with a phase change material filling space 5, and the phase change material is arranged in the phase change material filling space 5; the heating component 4 is arranged in the pipe 3 and used for heating the solid-state hydrogen storage material in the pipe 3.

[0038] According to the above-described structure, the working process of the solid-state hydrogen storage and heat storage device provided by the present application is as follows:

[0039] In the initial stage of hydrogen charging, an external power supply is turned on, the heating component 4 arranged outside the magnesium-based solid-state hydrogen storage material filling pipe 3, such as an electric heating wire wound outside the magnesium-based solid-state hydrogen storage material filling pipe 3, is used to heat the solid-state hydrogen storage material in the pipe 3, and when the temperature rises to the hydrogen charging temperature, the heating system of the heating component 4, such as the electric heating wire, is turned off, the hydrogen charging to the container is started, the hydrogen enters the inside of the pipe 3 through the opening on the pipe 3, at this time, the solid-state hydrogen storage material, such as the magnesium-based material, in the inside of the pipe 3 starts to store hydrogen while releasing a large amount of heat, the released heat will cause the phase change heat storage material in the phase change material filling space to be heated through heat conduction, when the temperature of the phase change material reaches the phase change point, the phase change material will melt, at this time, the temperature will not rise again, and the phase change latent heat is relatively large, so it will absorb most of the heat released by the solid-state hydrogen storage material during hydrogen charging, and when the phase change material is completely melted, the temperature will rise again.

[0040] When hydrogen needs to be released, the solid-state hydrogen storage material will be lowered in temperature due to the release of hydrogen, at this time, the phase change material will gradually solidify when the temperature of the phase change material is lowered to the phase change point through heat conduction, but the temperature change is not large, which is particularly important for temperature control during hydrogen release, so that the phase change material can continuously release the heat required by the solid-state hydrogen storage material during hydrogen release, while the temperature is basically not reduced too much, which can ensure that the hydrogen release rate is maintained at a relatively high level.

[0041] It can be seen that the application provides a hydrogen storage and heat storage device integrating a solid-state hydrogen storage material such as a magnesium-based hydrogen storage material and a phase change heat storage material. The device can be used to charge and discharge hydrogen on the same site or different sites without the need of additional cooling or heating equipment, heat coupling and recycling of the solid-state hydrogen storage material such as the magnesium-based hydrogen storage material, effectively improving the energy utilization rate of the whole system, greatly reducing the complexity of the system, and saving the equipment investment and a large amount of operation cost of the system.

[0042] Further, preferably, the number of mounting holes 23 is multiple, and the number of pipe fittings 3 is also multiple and corresponds to the multiple mounting holes 23 one by one, so as to improve the heat exchange efficiency and the amount of hydrogen charging and discharging. Of course, it is not limited to this, and only one mounting hole 23 and one pipe fitting 3 can be provided, or the number of mounting holes 23 is greater than the number of pipe fittings 3, etc., which is selected according to actual needs.

[0043] Further, preferably, the height direction of the pipe fitting 3 is the same as the height direction of the storage tank 1, which will be described below. Of course, it is not limited to this, and the height direction of the pipe fitting 3 can form an acute angle with the height direction of the storage tank 1, etc., which is designed according to actual needs.

[0044] Further, preferably, the pipe fitting 3 is a container with a hollow inside and an open top, of course, it is not limited to this, and it can also be a structure with a completely closed top and bottom and an open side, etc., which is selected according to actual needs.

[0045] In this embodiment, preferably, as shown in Figure 1 and Figure 2 , the pipe fitting support disc 2 comprises a bottom pipe fitting support disc 21, and the bottom pipe fitting support disc 21 has the aforementioned mounting holes 23; along the height direction of the pipe fitting 3, the bottom pipe fitting support disc 21 is arranged at the bottom of the pipe fitting 3, and along the height direction of the storage tank 1, the bottom pipe fitting support disc 21 divides the inside of the storage tank 1 into a first space 13 and a second space 14, and the pipe fitting 3 is arranged in the first space 13; the second space 14 also has phase change material arranged therein; the bottom pipe fitting support disc 21 is formed with a communication hole, and the first space 13 and the second space 14 are communicated through the communication hole.

[0046] According to the structure described above, the bottom pipe fitting support disc 21 plays a role in supporting the pipe fitting 3, so that the pipe fitting 3 is more stable as a whole; the second space 14 is arranged below the first space 13, which on the one hand increases the contact area of the phase change material with the solid-state hydrogen storage material, and on the other hand, the volume of the phase change material expands when it melts, and the second space 14 can accommodate the expansion amount of the phase change material in the first space 13, increasing the flowability of the material.

[0047] Further, preferably, the pipe 3 is connected to the bottom pipe support disc 21 by welding, but is not limited to this, and can be fixedly connected by interference fit or by adhesive.

[0048] Further, preferably, the bottom pipe support disc 21 is connected to the storage tank 1 by welding, but is not limited to this, and can be connected by adhesive or by bolts.

[0049] In this embodiment, preferably, as shown in FIG. 1, the storage tank 1 is formed with a first phase change material discharge port 15 communicating with the first space 13. Figure 1

[0050] According to the above-described structure, the phase change material in the first space 13 can be discharged from the tank body 11 through the first phase change material discharge port 15, thereby facilitating replacement of the first phase change material in the tank body 11.

[0051] Further, preferably, the first phase change material discharge port 15 is formed in the side wall of the storage tank 1.

[0052] Further, preferably, the first phase change material discharge port 15 is disposed close to the bottom of the first space 13 in the height direction of the storage tank 1.

[0053] In this embodiment, preferably, as shown in FIG. 1, the storage tank 1 is formed with a second phase change material discharge port 16 communicating with the second space 14. Figure 1

[0054] According to the above-described structure, the phase change material in the second space 14 can be discharged from the tank body 11 through the second phase change material discharge port 16, thereby facilitating replacement of the first phase change material in the tank body 11.

[0055] Further, preferably, the second phase change material discharge port 16 is formed in the side wall of the storage tank 1, but is not limited to this, and can be formed in the bottom wall of the storage tank 1.

[0056] Further, preferably, the second phase change material discharge port 16 is disposed close to the bottom of the second space 14 in the height direction of the storage tank 1.

[0057] In this embodiment, preferably, as shown in FIG. 1, an opening is formed in the top of the pipe 3 in the height direction of the pipe 3, and a hydrogen gas distribution space is formed between the top opening of the pipe 3 and the inner top wall of the storage tank 1. Figure 1

[0058] ​​​As can be seen from the structure described above, external hydrogen first enters the hydrogen distribution space, and then is evenly distributed into each pipe 3 by the hydrogen distribution space, which plays the role of buffering and evenly distributing hydrogen.

[0059] Further, preferably, such as Figure 1 As shown, the hydrogen inlet and outlet share the same opening, which can be named hydrogen inlet / outlet 18. This satisfies the requirements for gas intake and exhaust while facilitating processing and manufacturing. Of course, the hydrogen inlet and outlet can also be independent structures, which will not be discussed in detail here.

[0060] Furthermore, preferably, the number of hydrogen inlet and outlet 18 is one, but of course, it is not limited to this and can also be multiple, etc.

[0061] It should be noted that: this hydrogen distribution space may not be set up. Instead, multiple hydrogen inlets and outlets 18 can be set directly on the top of the storage tank 1, and the multiple hydrogen inlets and outlets 18 can be set up one-to-one with multiple pipe fittings 3 and connected to each other. The specific choice depends on the actual needs.

[0062] In this embodiment, preferably, as follows: Figure 1 As shown, the pipe support plate 2 includes a top pipe support plate 22, and the top pipe support plate 22 has the aforementioned mounting hole 23, and the top pipe support plate 22 is disposed on the top of the pipe 3 along the height direction of the pipe 3.

[0063] As can be seen from the structure described above, the top pipe support plate 22 fixes the top of the pipe 3, and the bottom pipe support plate 21 fixes the bottom of the pipe 3, making the pipe 3 more solid and stable as a whole, and preventing it from tilting.

[0064] Furthermore, preferably, the pipe fitting 3 and the top pipe fitting support plate 22 are connected by welding. Of course, this is not the only option; the two can also be fixedly connected by interference fit or by adhesive bonding.

[0065] Furthermore, preferably, the top pipe support plate 22 is connected to the storage tank 1 by welding. Of course, it is not limited to this, the top pipe support plate 22 and the storage tank 1 can also be connected by adhesive or bolts.

[0066] It should be noted that this solid-state hydrogen storage and thermal storage device may include only the top pipe support plate 22, only the bottom pipe support plate 21, or both the top pipe support plate 22 and the bottom pipe support plate 21, depending on the actual needs.

[0067] In this embodiment, preferably, as follows: Figure 1 As shown, the solid hydrogen storage and thermal storage device also includes an insulation layer 6, which is located on the outside of the storage tank 1.

[0068] According to the above description, the heat preservation layer 6 can adopt a nano aerogel material with low thermal conductivity, thereby ensuring that the container has small heat loss to the outside. Of course, the material of the heat preservation layer 6 is not limited to this, but can also be designed according to actual needs.

[0069] In this embodiment, preferably, as shown in Figure 1 The storage tank 1 includes a tank body 11 and a top cover 12; the top of the tank body 11 along the height direction thereof is formed with an opening, and the top cover 12 is detachably mounted at the opening end of the tank body 11; a hydrogen inlet and a hydrogen outlet are formed in the top cover 12.

[0070] According to the above description, the top cover 12 can be freely opened, thereby facilitating the filling of phase change materials and the like into the tank body 11, and in addition, facilitating the maintenance of other structures in the storage tank 1 and the like. Of course, it is not limited to this, and some openings can also be provided at the top of the storage tank 1, and a detachable sealing plug is mounted in the opening. When it is necessary to fill phase change materials into the inside, the sealing plug can be opened, and after the filling is completed, the sealing plug is reinstalled into the opening to play a sealing role.

[0071] In this embodiment, preferably, as shown in Figure 1 The solid-state hydrogen storage and heat storage device further includes a thermocouple 7, and the thermocouple 7 is fixed to the tank body 11, and the detection end of the thermocouple 7 extends into the solid-state hydrogen storage material in the pipe 3.

[0072] According to the above description, the thermocouple 7 detects the temperature of the phase change material at all times, thereby helping to achieve precise temperature control.

[0073] It should be noted that: in this embodiment, a plurality of thermocouples 7 can be arranged, which can be uniformly arranged, and it is not necessary to provide one thermocouple 7 for each pipe 3, and the specific selection can be made according to actual needs.

[0074] In this embodiment, preferably, as shown in Figure 1 The storage tank 1 is formed with a phase change material adding port 17, and the phase change material adding port 17 is provided with a detachable sealing cover.

[0075] According to the above description, the sealing cover is opened, thereby facilitating the addition of phase change materials into the storage tank 1, that is, there are two ways to add phase change materials into the storage tank 1, one is to open the top cover 12 of the storage tank 1 and then add phase change materials into the storage tank 1, and the other is to add phase change materials through the phase change material adding port 17.

[0076] In this embodiment, preferably, as shown in Figure 1As shown, the heating member 4 is arranged on the outer wall of the pipe 3, does not occupy the space inside the pipe 3, and ensures the loading amount of the solid-state hydrogen storage material. Of course, it is not limited to this, and the heating member 4 can also be arranged inside the pipe 3, etc.

[0077] In this embodiment, preferably, as shown, ​ As shown, the heating member 4 is an electric heating wire, has a large contact area with the pipe 3, increases the heating area, and can be designed according to actual needs, which can be spirally wound on the outer wall of the pipe 3, or arranged along the height direction of the pipe 3, etc. In addition, the heating member 4 is not limited to the electric heating wire, and can also be other heating structures, etc.

[0078] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A solid state hydrogen storage and heat storage device, characterized by, The solid-state hydrogen storage and heat storage device comprises a tank, a pipe support disc, pipes, a heating component, a solid-state hydrogen storage material and a phase change material. The tank is provided with a hydrogen inlet and a hydrogen outlet. The pipe support disc is provided in the tank and is provided with mounting holes.

2. The solid-state hydrogen storage heat reservoir of claim 1, wherein, The pipes are inserted into the mounting holes.

3. The solid-state hydrogen storage heat reservoir of claim 2, wherein, The pipes and the tank are provided with a phase change material filling space. The phase change material is provided in the phase change material filling space.

4. The solid state hydrogen storage and heat reservoir of claim 1, wherein, The heating component is provided in the pipes and is used for heating the solid-state hydrogen storage material in the pipes.

5. The solid state hydrogen storage heat reservoir of claim 1, wherein, The pipe support disc comprises a bottom pipe support disc.

6. The solid state hydrogen storage heat reservoir of claim 1, wherein, The bottom pipe support disc is provided at the bottom of the pipes along the height direction of the pipes.

7. The solid-state hydrogen storage heat reservoir of claim 1, wherein, The bottom pipe support disc divides the inside of the tank into a first space and a second space. The pipes are provided in the first space.

8. The solid-state hydrogen storage heat reservoir of claim 1, wherein, The second space is also provided with the phase change material.

9. The solid-state hydrogen storage heat reservoir of claim 1, wherein, The tank is provided with a first phase change material outlet communicating with the first space.

10. The solid-state hydrogen storage heat reservoir of any one of claims 1 to 9, wherein, The tank is provided with a second phase change material outlet communicating with the second space. The opening is provided at the top of the pipes along the height direction of the pipes. The pipe support disc comprises a top pipe support disc. The top pipe support disc is provided at the top of the pipes along the height direction of the pipes. The solid-state hydrogen storage and heat storage device further comprises an insulation layer. The insulation layer is provided outside the tank. The mounting holes are uniformly distributed on the pipe support disc. The pipes are also provided in plurality and correspond to the mounting holes one by one. The pipes and the pipe support disc are connected by welding. The pipe support disc and the tank are connected by welding. The tank comprises a tank body and a top cover. The top cover is detachably mounted on the opening end of the tank body. The hydrogen inlet and the hydrogen outlet are provided on the top cover. The solid-state hydrogen storage and heat storage device further comprises a thermocouple. The thermocouple is fixed on the tank body. The detection end of the thermocouple extends into the solid-state hydrogen storage material in the pipes. The tank is provided with a phase change material adding port. The phase change material adding port is provided with a detachable sealing cover. The heating component is provided on the outer wall of the pipes. The heating component is an electric heating wire. The height direction of the pipes is the same as the height direction of the tank. The hydrogen inlet and the hydrogen outlet are the same opening end.

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