Magnesium-based metal solid hydrogen storage device

Abstract

The utility model relates to the technical field of solid hydrogen storage and transportation, in particular to a magnesium-based metal solid hydrogen storage device. In order to solve the technical problems in the prior art, the utility model provides a magnesium-based metal solid hydrogen storage device which is high in mass hydrogen storage density, large in hydrogen storage capacity, high in heat exchange efficiency and good in safety. The hydrogen storage device comprises a tank body and a hydrogen supply pipe, wherein one end of the hydrogen supply pipe is inserted into the tank body, a hole is formed in the pipe wall, and the other end of the hydrogen supply pipe extends out of the tank body; a plurality of U-shaped heat exchange tubes are arranged in the tank body, the vertical parts of all the U-shaped heat exchange tubes are uniformly distributed at intervals in the circumferential direction, the central points of the horizontal parts are located on the axis of the tank body, and two ports of each U-shaped heat exchange tube extend out of the tank body; the U-shaped heat exchange tube is used for adjusting the temperature in the tank body; a plurality of layers of heat exchange fin groups are distributed in the tank body along the axis direction; magnesium-based hydrogen storage alloy is filled in the tank body to serve as a solid hydrogen storage material.

Description

Technical Field

[0001] This utility model relates to the field of solid-state hydrogen storage and transportation technology, and in particular to a magnesium-based metal solid-state hydrogen storage device. Background Technology

[0002] Hydrogen energy, characterized by its cleanliness, efficiency, and greenness, is a crucial carrier for achieving a green and low-carbon transformation in energy consumption. Hydrogen storage and transportation, acting as a bridge between hydrogen production and consumption, is a key link in realizing the large-scale application of hydrogen energy. However, hydrogen storage and transportation technology is becoming a bottleneck and obstacle to the large-scale application of hydrogen energy. Reversible hydrogen storage technology based on metal alloys offers advantages such as high hydrogen storage density, good safety, and abundant resources, making it an ideal medium for large-scale, low-cost hydrogen storage and transportation. Depending on the materials used, hydrogen storage alloys can be categorized into vanadium-based, magnesium-based, rare-earth, and titanium-iron-based alloys. Magnesium-based hydrogen storage alloys (theoretical hydrogen storage density 7.6 wt%) have a higher mass hydrogen storage density compared to rare-earth and titanium-iron-based alloys, making them one of the better hydrogen storage and transportation materials.

[0003] Magnesium-based hydrogen storage alloys have high hydrogen storage density, but their hydrogen absorption and desorption temperatures are high and energy consumption is large. In addition, the uneven heat and mass transfer during the hydrogen absorption and desorption process of magnesium-based hydrogen storage alloys causes the temperature of the alloys to rise or fall sharply, affecting the absorption and desorption rate. Moreover, the volume expansion of magnesium-based hydrogen storage alloys during hydrogenation can be as high as 30%, which will put great stress on the container wall during hydrogen absorption and desorption, and also requires high resistance to hydrogen embrittlement. Furthermore, repeated hydrogen absorption and desorption cycles of magnesium-based hydrogen storage alloys will cause metal pulverization and accumulation, which will reduce the purity of hydrogen and affect the engineering application of solid-state hydrogen storage technology based on magnesium-based hydrogen storage alloys.

[0004] Therefore, current hydrogen storage technologies have not yet effectively met the stringent requirements for comprehensive performance, including high hydrogen storage capacity, simplified structure, efficient heat exchange, and safety. Thus, in-depth research is urgently needed on the material properties, thermal management mechanisms, and cycle stability of magnesium-based hydrogen storage alloys to promote their feasibility and safety in engineering applications, ultimately achieving efficient and safe hydrogen energy storage solutions. Utility Model Content

[0005] In view of this, in order to solve the problems of the prior art, this utility model proposes a magnesium-based solid hydrogen storage device with high hydrogen storage density, large hydrogen storage capacity, high heat exchange efficiency and good safety.

[0006] The hydrogen storage device includes: a tank and a hydrogen supply pipe with one end inserted into the tank and an opening in the pipe wall, and the other end of the hydrogen supply pipe extending out of the tank;

[0007] Several U-shaped heat exchange tubes are arranged inside the tank. The vertical parts of all U-shaped heat exchange tubes are evenly spaced along the circumference, and the center point of the horizontal part is located on the tank axis. Both ends of each U-shaped heat exchange tube extend out of the tank. The U-shaped heat exchange tubes are used to regulate the temperature inside the tank.

[0008] Several layers of heat exchange fins are arranged along the axial direction inside the tank.

[0009] The tank is filled with a magnesium-based hydrogen storage alloy as a solid hydrogen storage material.

[0010] Preferably, the inner or outer wall of the hydrogen supply pipe is provided with a metal wire mesh.

[0011] Preferably, the hydrogen supply pipe includes a first hydrogen supply pipe and a second hydrogen supply pipe that are coaxially connected;

[0012] The second hydrogen supply pipe is located inside the tank, and one end of the first hydrogen supply pipe is connected to the second hydrogen supply pipe, while the other end extends out of the tank.

[0013] Preferably, the joint ends of the first hydrogen supply pipe and the second hydrogen supply pipe are provided with metal wire mesh.

[0014] Preferably, the heat exchange fin assembly consists of several radial fins, an outer supporting ring fin, and an inner supporting ring fin;

[0015] The outer and inner ring ribs of the support are thin-walled ring structures, and the outer and inner ring ribs of the support are coaxially arranged with the tank body.

[0016] The radial ribs are plate-shaped and are vertically arranged.

[0017] The inner ring rib of the support is connected to several of the U-shaped heat exchange tubes;

[0018] The radial ribs include an inner first radial rib and an outer second radial rib; one end of the first radial rib is connected to the hydrogen supply pipe, and the other end is connected to the U-shaped heat exchange pipe;

[0019] One end of the second radial rib is connected to the side wall of the U-shaped heat exchange tube, and the other end is connected to the supporting outer ring rib.

[0020] Preferably, the top of the tank is provided with an end cap, and the hydrogen supply pipe extends from the end cap;

[0021] The end cap has a threaded structure. Before loading, the end cap is detachably connected to the filling port of the tank through the threaded structure. After loading, the end cap is welded to the tank.

[0022] The hydrogen supply pipe extends from the center of the end cap and is welded to the end cap.

[0023] Preferably, one port of each U-shaped heat exchanger tube is connected to the heat exchange inlet flow distribution coil of the heat exchange inlet, and the other port is connected to the heat exchange outlet flow distribution coil of the heat exchange outlet.

[0024] Both the heat exchanger inlet flow distribution coil and the heat exchanger outlet flow distribution coil are semi-circular pipes and are arranged symmetrically with respect to the center of the tank axis.

[0025] The heat exchanger inlet flow distribution coil is connected to the heat exchanger inlet elbow, and the heat exchanger outlet flow distribution coil is connected to the heat exchanger outlet elbow.

[0026] One end of the heat exchanger inlet elbow is connected to the heat exchanger inlet pipe flange, and the other end is connected to the heat exchanger inlet flow distribution coil.

[0027] One end of the heat exchange outlet elbow is connected to the heat exchange outlet pipe flange, and the other end is connected to the heat exchange outlet flow distribution coil.

[0028] Preferably, the top of the tank is also provided with a temperature measuring blind tube for installing thermocouples to measure the temperature of the solid hydrogen storage material inside the tank.

[0029] Beneficial effects:

[0030] (i) The U-shaped heat exchange tube of this utility model has several tubes. The vertical part of the U-shaped heat exchange tube is evenly distributed along the circumference of the tank, and the center point of the horizontal part is located on the axis of the tank. This design can maximize the heat exchange area inside the tank and uniformly change the temperature inside the tank, which is conducive to the hydrogen storage and release reaction with the hydrogen storage solid material. At the same time, several layers of heat exchange fins are evenly arranged inside the tank along the axial direction to further improve the heat exchange efficiency and the hydrogen storage and release rate inside the tank.

[0031] (II) The two ends of the U-shaped heat exchanger tube of this utility model are respectively equipped with heat exchange inlet flow distribution coils and heat exchange outlet flow distribution coils to evenly distribute the heat transfer oil flowing in and out from the heat exchange inlet and heat exchange outlet, thereby increasing the turbulence of the heat transfer oil in each U-shaped heat exchanger tube, reducing the thickness of the boundary layer, reducing thermal resistance, and improving heat exchange efficiency. (The boundary layer can be understood as the layered flow of heat transfer oil in the pipeline, with the flow velocity being slower closer to the pipe wall and faster closer to the center. This is a steady-state flow, and the heat transfer between different layers is mainly heat conduction, resulting in low heat transfer efficiency and relatively high thermal resistance. After adopting the U-shaped heat dissipation tube in this utility model, the flow direction of the heat transfer oil will change from steady-state flow to turbulent flow. The heat transfer efficiency of turbulent flow is higher than that of steady-state flow. Therefore, the U-shaped heat dissipation tube reduces the boundary layer thickness and reduces thermal resistance.)

[0032] (III) The hydrogen supply pipe of this utility model includes a first hydrogen supply pipe and a second hydrogen supply pipe. Since the first hydrogen supply pipe is provided with metal wire mesh on its pipe wall and at the bottom hole, the metal wire mesh on the pipe wall of the second hydrogen supply pipe further filters the pulverized powder, thereby improving the purity of the released hydrogen. Furthermore, by increasing the number of openings in the first and / or second hydrogen supply pipes, the flow rate of hydrogen during the storage and release process can be increased, thereby improving the efficiency of hydrogen storage and release.

[0033] (iv) The radial ribs, outer ring ribs, and inner ring ribs of this utility model are all flat and vertically arranged on their surfaces. Compared with horizontal arrangement, this facilitates the filling of solid hydrogen storage material and increases the filling amount of solid hydrogen storage material, thereby further improving the hydrogen storage and release capacity.

[0034] (V) The heat exchange fin assembly of this utility model includes radial fins, supporting outer ring fins, and supporting inner ring fins. The heat exchange fin assembly has the characteristic of radiating outwards from the tank axis, that is, each layer of heat exchange fin assembly is evenly distributed along the axis inside the tank. The radial fins include a first radial fin and a second radial fin; one end of the first radial fin is connected to the second hydrogen supply pipe, and the other end of the first radial fin is connected to the U-shaped heat exchange pipe; one end of the second radial fin is connected to the side wall of the U-shaped heat exchange pipe, and the other end of the second radial fin is connected to the supporting outer ring fin; the extension line of the line connecting the first radial fin and the second radial fin passes through the second hydrogen supply pipe, and with several layers of heat exchange fin assembly evenly arranged along the tank axis, the heat exchange efficiency inside the tank is further increased, and the hydrogen storage and release rate is improved.

[0035] (vi) The heat exchange fin assembly of this utility model includes an outer supporting ring fin and an inner supporting ring fin, both of which are flat ring structures. Several sets of heat exchange fin assemblies are evenly arranged on the axis of the tank body, which is equivalent to adding two more protective barriers inside the tank body. During the storage and release of hydrogen in the hydrogen storage tank, the stress exerted on the inner wall of the tank by the solid hydrogen storage material is weakened, and the tank body is prevented from brittle fracture under stress, thus ensuring the reliability and safety of the tank body.

[0036] (vii) The top of the tank of this utility model is provided with a temperature measuring blind tube for installing thermocouples, so as to facilitate monitoring the temperature change inside the tank, adjust the temperature of the heat transfer oil, and realize the regulation and control of the hydrogen storage and release process. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a magnesium-based solid-state hydrogen storage device.

[0038] Figure 2 This is a left-side cross-sectional view of a magnesium-based solid-state hydrogen storage device.

[0039] Figure 3 This is a front cross-sectional view of a magnesium-based solid-state hydrogen storage device.

[0040] Figure 4 A schematic diagram of the hydrogen supply pipe structure for a magnesium-based solid-state hydrogen storage device.

[0041] Among them, 1-tank body, 2-hydrogen supply pipe, 21-first hydrogen supply pipe, 22-second hydrogen supply pipe, 3-U-shaped heat exchange pipe, 4-heat exchange inlet, 41-heat exchange inlet pipe flange, 42-heat exchange inlet main elbow, 43-heat exchange inlet flow distribution coil, 5-heat exchange outlet, 51-heat exchange outlet pipe flange, 52-heat exchange outlet main elbow, 53-heat exchange outlet flow distribution coil, 6-heat exchange fin assembly, 61-radial fin, 611-first radial fin, 612-second radial fin, 62-outer supporting ring fin, 63-inner supporting ring fin, 7-temperature measuring blind tube, 8-end cap, 9-magnesium-based hydrogen storage alloy. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be fully described below with reference to the accompanying drawings. All other embodiments obtained by other skilled personnel in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0043] like Figure 1-4 As shown, a magnesium-based solid hydrogen storage device includes: a tank 1 and a hydrogen supply pipe 2 with one end inserted into the tank 1 and the pipe wall having an opening, the other end of the hydrogen supply pipe 2 extending out of the tank 1; the tank 1 is a cylindrical shape made of stainless steel and is used to fill solid hydrogen storage material.

[0044] Several U-shaped heat exchange tubes 3 are arranged inside the tank body 1, that is, the U-shaped heat exchange tubes 3 are evenly spaced circumferentially with the axis of the tank body 1 as the center (the vertical parts of all U-shaped heat exchange tubes 3 are evenly spaced circumferentially, and the center point of the horizontal part is located on the axis of the tank body 1). Each U-shaped heat exchange tube 3 has two ends extending out of the tank body 1 through through holes opened at the front end cap. Each through hole corresponds one-to-one with the ends of the U-shaped heat exchange tube 3, and each U-shaped heat exchange tube 3 is welded and fixed to the tank body 1. Heat-conducting oil flows inside the U-shaped heat exchange tubes 3, serving as the heat exchange medium to provide the conditions for the storage and release of hydrogen in the solid hydrogen storage material.

[0045] Several layers of heat exchange fin groups 6 are arranged inside the tank body 1, and the several layers of heat exchange fin groups 6 are evenly spaced along the axial direction of the tank body 1.

[0046] The tank 1 is filled with solid hydrogen storage material, which is a magnesium-based hydrogen storage alloy 9. This magnesium-based metal solid hydrogen storage device achieves the purpose of storing and releasing hydrogen through solid hydrogen storage material.

[0047] As an example, tank 1 is made of S31603 stainless steel with a wall thickness of 8-10 mm, a diameter of 50 cm and a length of 3 m.

[0048] like Figure 4 As shown, regarding the hydrogen supply pipe 2, one end of it inserted into the tank 1 is sealed, and the other end (i.e., the end extending out of the tank 1) is open; the hydrogen supply pipe 2 is located at the center of the tank 1. The hydrogen supply pipe 2 includes a first hydrogen supply pipe 21 and a second hydrogen supply pipe 22 coaxially connected. Several holes are evenly distributed circumferentially and axially on the walls of the first hydrogen supply pipe 21 and the second hydrogen supply pipe 22 to allow hydrogen to flow into or out of the tank 1. The second hydrogen supply pipe 22 is slightly shorter than the length of the tank 1, penetrating the hydrogen storage bed inside the hydrogen storage tank 1, i.e., the area where hydrogen is stored in combination with solid hydrogen storage material, facilitating rapid hydrogen overflow and diffusion. When filling with solid hydrogen storage material, the second hydrogen supply pipe 22 is not withdrawn from the tank 1. One end of the second hydrogen supply pipe 22 inserted into the tank 1 is sealed, and the other end is open. Both ends of the first hydrogen supply pipe 21 are open, one end of which is connected to the open end of the second hydrogen supply pipe 22, and the other end extends out of the tank 1.

[0049] As an example, the hydrogen supply pipe 2 is a stainless steel pipe.

[0050] As an example, four holes are evenly distributed circumferentially on the walls of the first hydrogen supply pipe 21 and the second hydrogen supply pipe 22. Increasing the number of holes in the first hydrogen supply pipe 21 and / or the second hydrogen supply pipe 22 can increase the flow rate of hydrogen during hydrogen storage and release, thereby improving the efficiency of hydrogen storage and release.

[0051] Furthermore, the outer diameter of the first hydrogen supply pipe 21 is smaller than the inner diameter of the open end of the second hydrogen supply pipe 22, facilitating the insertion between the first and second hydrogen supply pipes 21 and 22. Metal mesh is provided on the walls of both the first and second hydrogen supply pipes 21 and 22, and several holes in the walls of both pipes are covered by the metal mesh. Additionally, metal mesh is provided at the bottom hole of the first hydrogen supply pipe 21 (i.e., the end that connects with the second hydrogen supply pipe 22). During hydrogen release, the metal mesh prevents the magnesium-based hydrogen storage alloy 9 powder from overflowing from the tank 1, further improving the purity of the released hydrogen.

[0052] As an example, a filter layer made of pressed metal wire mesh can also be installed on the inner wall of the first hydrogen supply pipe 21 and the second hydrogen supply pipe 22, which can also achieve the effect of filtering metal powder and improving the purity of hydrogen.

[0053] As an example, the diameter of the circular hole on the side wall of the second hydrogen supply pipe 22 is 6 mm.

[0054] Furthermore, the tank body 1 is equipped with an end cap 8 at the top. Before filling, the end cap 8 is detachably connected to the filling port of the tank body 1. For example, the end cap 8 and the filling port are connected by a threaded structure. The first hydrogen supply pipe 21 extends from the center of the end cap 8 and is welded to the end cap 8. When it is necessary to fill the tank body 1 with solid hydrogen storage material, the end cap 8 is unscrewed, and the first hydrogen supply pipe 21 is pulled out of the tank body 1. After the filling operation is completed, the first hydrogen supply pipe 21 is inserted into the second hydrogen supply pipe 22. During pressure testing, the end cap 8 and the filling port are sealed using threads and sealing rings; and the end cap 8 is completely welded to the tank body 1 to improve the sealing effect. In addition, compared with the traditional method of using flange-reinforced end cap 8, this solution has the advantages of occupying less space and facilitating welding operations.

[0055] The top of the tank body 1 is also provided with a heat exchange inlet 4 and a heat exchange outlet 5; wherein the heat exchange inlet 4 includes: a heat exchange inlet pipe flange 41, a heat exchange inlet main elbow 42 and a heat exchange inlet flow distribution coil 43; one end of the heat exchange inlet main elbow 42 is connected to the heat exchange inlet flow distribution coil 43, and the other end is provided with the heat exchange inlet pipe flange 41; the heat exchange outlet 5 includes: a heat outlet pipe flange 51, a heat exchange outlet main elbow 52 and a heat exchange outlet flow distribution coil 53; one end of the heat exchange outlet main elbow 52 is connected to the heat exchange outlet flow distribution coil 53, and the other end is provided with the heat outlet pipe flange 51.

[0056] Regarding the U-shaped heat exchanger tubes 3: one port of each U-shaped heat exchanger tube 3 is connected to the heat exchange inlet flow distribution coil 43 of the heat exchange inlet 4, and the other port is connected to the heat exchange outlet flow distribution coil 53 of the heat exchange outlet 5; both the heat exchange inlet flow distribution coil 43 and the heat exchange outlet flow distribution coil 53 are semi-circular pipes and are symmetrically arranged on the outside of the tank body 1 along the axis of the tank body 1. The inlet and outlet flow distribution coils are used to distribute and collect the flow of heat transfer oil, that is, to ensure that the heat transfer oil flowing to each U-shaped heat exchanger tube 3 is evenly distributed, and that the heat transfer oil flowing out of each U-shaped heat exchanger tube 3 is quickly collected, which can improve the heat exchange efficiency.

[0057] The U-shaped heat exchange tubes 3 are arranged concentrically inside the tank 1, which can ensure a large heat exchange area inside the tank 1. As an example, there are 7 U-shaped heat exchange tubes 3, which are made of 316L stainless steel.

[0058] In addition to the U-shaped heat exchange tubes 3, the heat exchange structure of this magnesium-based solid hydrogen storage device also includes a heat exchange fin assembly 6. The heat exchange fin assembly 6 consists of several radial fins 61, an outer supporting fin 62, and an inner supporting fin 63. The outer and inner supporting fins 62 and 63 are thin-walled annular structures, coaxially arranged with the tank body 1. The radial fins 61 are plate-shaped and vertically arranged (i.e., the surface of the radial fin 61 is parallel to the axis of the tank body 1, with one edge of the radial fin 61 along the radial direction of the tank body 1 and the other edge along the axial direction). The several radial fins 61 are evenly spaced circumferentially around the hydrogen supply tube 2. The inner supporting fin 63 is connected to several of the U-shaped heat exchange tubes 3.

[0059] The radial rib 61 includes an inner first radial rib 611 and an outer second radial rib 612; one end of the first radial rib 611 is connected to the second hydrogen supply pipe 22, so that the second hydrogen supply pipe 22 is fixed inside the tank body 1 by the radial rib 61.

[0060] The other end of the first radial rib 611 is connected to the U-shaped heat exchange tube 3, and one end of the second radial rib 612 is connected to the side wall of the U-shaped heat exchange tube 3, while the other end is connected to the supporting outer ring rib 62. The extension line of the line connecting the first radial rib 611 and the second radial rib 612 passes through the second hydrogen supply pipe 22.

[0061] As an example, the first radial rib 611 and the second radial rib 612 are welded to the U-shaped heat exchange tube 3, and the inner supporting ring rib 63 is welded to the U-shaped heat exchange tube 3 using dissimilar materials.

[0062] like Figure 2 As shown, the heat exchange fins are arranged radially, and several layers of heat exchange fins are uniformly arranged along the axis of the tank 1, further improving the heat exchange efficiency and hydrogen storage and release rate within the tank 1. Furthermore, the outer supporting ribs 62, the inner supporting ribs 63, and the radial ribs 61 uniformly distribute the solid hydrogen storage material inside the tank 1, preventing uneven accumulation of the solid hydrogen storage material within the tank 1 that could lead to increased expansion stress or even deformation of the tank 1.

[0063] During the first hydrogen filling process, the magnesium-based hydrogen storage alloy 9 will experience volume expansion. The large expansion stress can damage the tank body 1. By using the outer ring rib 62 and the inner ring rib 63 to constrain the expansion of the magnesium-based hydrogen storage alloy 9 to a smaller scale, the outer ring rib 62 and the inner ring rib 63 are equivalent to adding two protective barriers inside the tank body 1. During the hydrogen storage and release process of the tank body 1, these barriers are used to reduce the stress exerted by the solid hydrogen storage material on the inner wall of the tank body 1, preventing the tank body 1 from undergoing brittle fracture under stress, and ensuring the reliability and safety of the tank body 1.

[0064] As an example, the heat exchange fin assembly 6 is made of copper.

[0065] As an example, a temperature-measuring blind tube 7 is welded to the front end of the tank 1 for inserting a thermocouple, such as a multi-point thermocouple. A typical thermocouple has its measuring point at the end and can only measure the temperature at one location. However, the multi-point thermocouple in this design has multiple measuring points along its length on the side wall, allowing for the measurement of temperature values ​​at different heights within the hydrogen storage tank 1. The temperature of the heat transfer oil can be adjusted based on these temperature changes, thus achieving regulation and control of the hydrogen storage and release process.

[0066] As an example, a lifting ring is welded to the front end of the tank 1 for installation and transportation of the tank 1.

[0067] Working principle:

[0068] Filling with magnesium-based hydrogen storage alloy 9: Use a crane to place tank 1 vertically on the vibrating filling table and unscrew the end cap 8; slowly inject magnesium-based hydrogen storage alloy 9 particles using a hopper, first injecting 30% of the total filling volume, adjust the position of tank 1, and turn on the vibrating table to vibrate for 2 minutes; turn off the vibrating table, fix tank 1, continue to fill 20%, vibrate for 3 minutes, and turn off the vibrating table; continue filling until tank 1 reaches 80% of its total volume, turn on the vibrating table to vibrate for 5 minutes, and turn off the vibrating table; install the end cap 8 of the filling port, weld the filling port to the end cap 8, check the airtightness, and complete the filling of solid hydrogen storage material.

[0069] Activation of magnesium-based hydrogen storage alloy 9: Helium was used to check the airtightness of tank 1. Tank 1 was evacuated to 100 Pa. Heat the magnesium-based hydrogen storage alloy 9 inside tank 1 using 250°C heat transfer oil until its temperature reached 200°C. The hydrogen valve was opened, and the hydrogen pressure was maintained at 3 MPa. The hydrogen flow rate was recorded. After tank 1 began to absorb hydrogen and reached saturation, hydrogen was released at 300°C. Repeating the hydrogen storage and release operation 3-5 times completes the activation of the magnesium-based hydrogen storage alloy 9.

[0070] Experimental results show that the magnesium-based solid-state hydrogen storage device is simple to operate, has a large hydrogen storage capacity, and high safety. After 1500 hydrogen storage and release operations, its hydrogen storage and release capacity and rate did not change significantly. The activated magnesium-based hydrogen storage alloy 9 can be used as a high-purity hydrogen source in various fields.

[0071] Regarding the magnesium-based hydrogen storage alloy 9, its main component is magnesium hydride, and it also contains cerium and nickel, with cerium accounting for 0.1%-0.5% and nickel accounting for 0.3%-0.8%, respectively. The magnesium-based hydrogen storage alloy 9 is made into a tablet shape, which facilitates filling and ensures the flow of hydrogen in the porous structure formed by the tablet.

[0072] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A magnesium-based metal solid-state hydrogen storage device, characterized by, It includes a tank (1) and a hydrogen supply pipe (2) with one end inserted into the tank (1) and the pipe wall having an opening, and the other end of the hydrogen supply pipe (2) extends out from the tank (1); Several U-shaped heat exchange tubes (3) are arranged inside the tank (1). The vertical parts of all U-shaped heat exchange tubes (3) are evenly spaced along the circumference, and the center point of the horizontal part is located on the axis of the tank (1). Both ends of each U-shaped heat exchange tube (3) extend out of the tank (1). The U-shaped heat exchange tubes (3) are used to regulate the temperature inside the tank (1). Several layers of heat exchange fin groups (6) are arranged along the axial direction inside the tank body (1); The tank (1) is filled with magnesium-based hydrogen storage alloy (9) as a solid hydrogen storage material.

2. The magnesium-based metal solid hydrogen storage device of claim 1, wherein, The inner or outer wall of the hydrogen supply pipe (2) is provided with a metal wire mesh.

3. The magnesium-based metal solid hydrogen storage device of claim 1, wherein, The hydrogen supply pipe (2) includes a first hydrogen supply pipe (21) and a second hydrogen supply pipe (22) that are coaxially connected; The second hydrogen supply pipe (22) is located inside the tank (1), and one end of the first hydrogen supply pipe (21) is connected to the second hydrogen supply pipe (22), while the other end extends out of the tank (1).

4. The magnesium-based metal solid hydrogen storage device of claim 3, wherein, Metal mesh is provided at the joint end of the first hydrogen supply pipe (21) and the second hydrogen supply pipe (22).

5. A magnesium-based metal solid state hydrogen storage device according to any one of claims 1 to 4, wherein the magnesium-based metal solid state hydrogen storage device is a magnesium-based metal hydride. The heat exchange fin assembly (6) consists of several radial fins (61), a supporting outer ring fin (62), and a supporting inner ring fin (63); The outer ring rib (62) and the inner ring rib (63) are thin-walled ring structures, and the outer ring rib (62) and the inner ring rib (63) are coaxially arranged with the tank body (1); The radial rib (61) is plate-shaped and is vertically arranged; The inner ring rib (63) of the support is connected to a plurality of the U-shaped heat exchange tubes (3); The radial rib (61) includes an inner first radial rib (611) and an outer second radial rib (612); one end of the first radial rib (611) is connected to the hydrogen supply pipe (2), and the other end is connected to the U-shaped heat exchange pipe (3); One end of the second radial rib (612) is connected to the side wall of the U-shaped heat exchange tube (3), and the other end is connected to the supporting outer ring rib (62).

6. A magnesium-based metal solid state hydrogen storage device according to any one of claims 1 to 4, wherein the magnesium-based metal solid state hydrogen storage device is a magnesium-based metal hydride. The tank body (1) is provided with an end cap (8) at the top, and the hydrogen supply pipe (2) extends from the end cap (8); The end cap (8) has a threaded structure. Before loading, the end cap (8) is detachably connected to the filling port of the tank (1) through the threaded structure. After loading, the end cap (8) is welded to the tank (1). The hydrogen supply pipe (2) extends from the center of the end cap (8) and is welded to the end cap (8).

7. A magnesium-based metal solid state hydrogen storage device according to any one of claims 1 to 4, wherein the magnesium-based metal solid state hydrogen storage device is a magnesium-based metal hydride. One port of each U-shaped heat exchange tube (3) is connected to the heat exchange inlet flow distribution coil (43) of the heat exchange inlet (4), and the other port is connected to the heat exchange outlet flow distribution coil (53) of the heat exchange outlet (5). The heat exchange inlet flow distribution coil (43) and the heat exchange outlet flow distribution coil (53) are both semi-circular pipelines and are arranged symmetrically with respect to the center of the tank body (1). The heat exchange inlet flow distribution coil (43) is connected to the heat exchange inlet elbow (42), and the heat exchange outlet flow distribution coil (53) is connected to the heat exchange outlet elbow (52). One end of the heat exchanger inlet elbow (42) is connected to the heat exchanger inlet pipe flange (41), and the other end is connected to the heat exchanger inlet flow distribution coil (43). One end of the heat exchange outlet elbow (52) is connected to the heat exchange outlet pipe flange (51), and the other end is connected to the heat exchange outlet flow distribution coil (53).

8. A magnesium-based metal solid state hydrogen storage device according to any one of claims 1 to 4, wherein, The top of the tank (1) is also provided with a temperature measuring blind tube (7) for installing thermocouples to measure the temperature of the solid hydrogen storage material inside the tank (1).

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