Basalt fiber tube hydrogen storage device and manufacturing method

Abstract

The application relates to a basalt fiber tube hydrogen storage device and a manufacturing method, which comprises a shell and a tube bundle in the shell, the tube bundle is formed by the same-direction arrangement of a plurality of hollow basalt fiber tubes, both ends of each basalt fiber tube are open, flange rings are arranged at both ends of the tube bundle, gas pressure sealing treatment is carried out between the flange rings and the tube bundle and between adjacent basalt fiber tubes at the positions of the flange rings, shell flanges and pressure end covers are arranged at both ends of the shell, the flange rings are arranged between the pressure end covers and the shell flanges, the three are fixedly connected, the gap between the flange rings and the shell flanges is subjected to liquid pressure sealing treatment, the gap between the pressure end covers and the flange rings is subjected to gas pressure sealing treatment, and explosion-proof liquid is injected into the shell. The micron-level basalt fiber tube is used for hydrogen storage, the hollow degree and the pressure bearing capacity are higher, the hydrogen storage mass ratio is improved, the economic advantages are obvious, the fiber tube does not need to be subjected to fusion sealing, the manufacturing process is simplified, and the hydrogen storage and transportation safety is high.

Description

Technical Field

[0001] This invention relates to high-pressure hydrogen storage containers, specifically to a basalt fiber tube hydrogen storage device and its manufacturing method. Background Technology

[0002] Hydrogen energy is a secondary energy source because it only produces water during use. Vigorously developing hydrogen energy can mitigate the environmental impact of carbon emissions. However, hydrogen storage has become a bottleneck restricting its development. As the smallest and lightest substance in nature, hydrogen molecules face numerous challenges in various hydrogen storage technologies, including high-pressure gaseous, cryogenic liquid, organic liquid, and metallic solid storage. These challenges include: safety, transportation safety, and storage efficiency of high-pressure gaseous hydrogen storage devices; high energy consumption for hydrogen liquefaction and transportation regulations; extremely low hydrogen mass ratio in metallic solid storage; and the need for process control technologies for organic liquid hydrogen storage. It is particularly important to emphasize that all these hydrogen storage methods suffer from a very low hydrogen storage capacity (hydrogen mass ratio wt%). All these issues limit the large-scale application of hydrogen energy.

[0003] High-pressure gaseous hydrogen storage systems made from micron-sized glass fiber tubes have been developed both domestically and internationally. These glass fiber tubes have a thin-walled, hollow structure with a hollowness rate as high as 90%, thus achieving a hydrogen storage capacity (and can also store other gases) of up to 90%. Simultaneously, the thin-walled structure of the micron-sized glass fiber tubes can withstand pressures up to 140 MPa, and the specific gravity of glass is about one-third that of steel. This results in high hydrogen storage efficiency for hydrogen storage containers made from glass fiber tubes, achieving an excellent hydrogen storage mass ratio of 10.1 wt%. With continuous technological optimization, this figure is expected to reach 15 wt%.

[0004] As is well known, both glass and basalt are silicates in chemical composition, but the physical forms of the solids they form after melting and cooling differ. Glass forms an amorphous solid, while basalt has a crystalline structure. Basalt fiber tubes, with their crystalline structure, have significant advantages over amorphous glass fiber tubes in many physical properties, such as higher mechanical strength and the ability to have thinner walls. Therefore, hydrogen storage systems made from basalt fiber tubes have higher storage capacity, higher storage pressure, and a greater hydrogen mass ratio compared to systems made from glass fiber tubes. Theoretical calculations show that they can withstand pressures greater than 150 MPa and a hydrogen mass ratio approaching 20 wt%.

[0005] Patent CN114811426B discloses a "High-Pressure Hydrogen Storage Device Based on Micro / Nano Glass Fiber Tubes." In this patent, the casing is open at one end and sealed at the other, and is made of borosilicate glass. An array of glass fiber tubes is inserted into the open end of the casing. By heating the sealed end of the casing, the end of the glass fiber tube array furthest from the gas inlet fuses with the sealed end of the casing, forming a closed end. This structural design is prone to deformation of the sealed end of the casing. Furthermore, if the sealed end of any individual fiber tube in the array is not completely sealed, hydrogen leakage will occur. The escaped hydrogen increases the pressure on the casing, and the resulting pressure rise can easily lead to a destructive burst, damaging other intact glass fiber tubes. Moreover, the need for fusion sealing at one end of the glass fiber tube increases the manufacturing difficulty, and the reduced length of the fused-sealed fiber tube affects the hydrogen storage capacity, hindering cost reduction. Summary of the Invention

[0006] Given that there is room for further optimization in both the structural design of the hydrogen storage device and the selection of fiber tube materials in the existing technology, the inventors have designed a basalt fiber tube hydrogen storage device, which can improve the hydrogen storage mass ratio, improve the safety of hydrogen storage and transportation, simplify the manufacturing process of the hydrogen storage device, and has better economic efficiency.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A basalt fiber tube hydrogen storage device is characterized by comprising a cylindrical outer shell with two open ends and a tube bundle placed inside the outer shell. The tube bundle is formed by multiple hollow basalt fiber tubes arranged in the same direction. Each basalt fiber tube in the tube bundle has open ends. Flange rings for binding and fixing the basalt fiber tubes are respectively provided at both ends of the tube bundle. The gap between the flange ring and the tube bundle, as well as the gap between adjacent basalt fiber tubes at the flange ring location, are gas pressure sealed. Both ends of the outer shell are provided with an outer shell flange and a pressure end cap. The flange ring located on the same side is located between the pressure end cap and the outer shell flange. The pressure end cap, flange ring, and outer shell flange are fixedly connected. The gap between the flange ring and the outer shell flange is liquid pressure sealed, and the gap between the pressure end cap and the flange ring is gas pressure sealed. The outer shell is an explosion-proof liquid-sealed outer shell with an explosion-proof liquid injection port. Explosion-proof liquid is injected into the outer shell, and the filling pressure of the explosion-proof liquid injected into the outer shell is half of the rated working pressure of the hydrogen storage device.

[0008] Furthermore, the outer shell is assembled from two hollow semi-cylinders, and the joint is sealed by liquid pressure.

[0009] Furthermore, the diameter of the basalt fiber tube is ≤10 micrometers, and the hollow area of ​​the basalt fiber tube accounts for ≥90%.

[0010] Furthermore, the hollow area of ​​the basalt fiber tube accounts for 90% to 95%.

[0011] Furthermore, the pressure end cap at one end of the outer casing is provided with an interface for installing an inlet / outlet air pipe, the inlet / outlet air pipe is installed at the interface, and a valve is installed on the inlet / outlet air pipe.

[0012] Furthermore, the pressure end cap with inlet and outlet pipes has an outwardly raised basin-shaped structure, and the cavity inside the pressure end cap located at the basin-shaped structure is equipped with a gas impurity filter device or filled with gas impurity filter material.

[0013] Furthermore, the pressure end caps at both ends of the outer shell are respectively provided with interfaces, and an air pipe is installed at each interface, and a valve is installed on each air pipe.

[0014] Furthermore, the pressure end caps at both ends of the outer shell are provided with outwardly raised basin-shaped structures, and the cavity inside the basin-shaped structure of each pressure end cap is provided with a gas impurity filtering device or filled with gas impurity filtering material.

[0015] This invention also discloses a method for manufacturing the above-mentioned basalt fiber tube hydrogen storage device, comprising the following steps: Step 1) Determine the outer shell size, the number and length of basalt fiber tubes required in the tube bundle based on the hydrogen storage capacity and storage pressure design requirements; Step 2) Arrange the required number of basalt fiber tubes in the same direction to form a tube bundle. Fit flange rings at both ends of the tube bundle to bind and fix each basalt fiber tube. Perform gas pressure sealing treatment on the gap between the flange ring and the tube bundle, as well as between adjacent basalt fiber tubes in the tube bundle at the location of the flange ring. Step 3) Disassemble the outer shell into two half shells. First, put the tube bundle from step 2) into one half shell, and fit the flange ring with the outer shell flange. Then, assemble the other half shell. Step 4) Install a pressure end cap at each end of the assembled shell, and fit the edge of the pressure end cap with the flange ring. Secure the pressure end cap, flange ring, and shell flange together with fasteners. Step 5) Perform explosion-proof liquid pressure sealing treatment on the gap between the flange ring and the outer shell flange, perform gas pressure sealing treatment on the gap between the pressure end cap and the flange ring, and perform explosion-proof liquid pressure sealing treatment on the splice of the outer shell. Step 6) Check the sealing of the casing. If the sealing is qualified, inject explosion-proof liquid into the casing.

[0016] Furthermore, in step 4), air pipes, valves, and pressure gauges are installed on the pressure end caps at both ends of the outer shell. Before installing the pressure end caps on each side, a gas impurity filter device or gas impurity filter material is first installed in the space between the pressure end cap and the tube bundle; or in step 4), air pipes, valves, and pressure gauges are only installed on the pressure end cap at one end of the outer shell, and before installing the pressure end cap on that side, a gas impurity filter device or gas impurity filter material is first installed in the space between the pressure end cap and the tube bundle.

[0017] This invention utilizes micron-sized basalt fiber tubes bundled into tube bundles, eliminating the need for molten sealing of the basalt fiber tubes within the bundles, thus simplifying the manufacturing process and reducing technical difficulty. Using basalt fiber tubes for hydrogen storage achieves a porosity of nearly 95%, and the micron-sized basalt fiber tubes have a pressure resistance exceeding 150 MPa. Basalt's specific gravity is one-third that of steel; when used as a container to store hydrogen, its hydrogen storage mass ratio is expected to reach 20 wt%, far exceeding the specifications of carbon fiber-wound aluminum alloy-lined hydrogen storage containers. Furthermore, basalt, being a cheaper material than carbon fiber, offers significant economic advantages. In addition to its superior material selection, this invention's structural design allows the outer shell to withstand only half the rated hydrogen storage pressure, with the hydrogen storage pressure borne solely by the basalt fiber tubes and pressure end caps. This allows for a relatively thin outer shell, significantly reducing its mass and contributing to a higher hydrogen storage mass ratio, resulting in better economic efficiency.

[0018] Furthermore, to improve the safety of hydrogen storage, the outer casing of this invention adopts an explosion-proof liquid pressure sealing structure. Even if individual basalt fiber tubes rupture and cause hydrogen leakage, the leakage will only occur in the explosion-proof liquid inside the casing, preventing it from leaking to the outside and mixing with oxygen to form a hazard. Although the pressure of the explosion-proof liquid will rise, the gas leakage rate is very slow due to the small size of a single basalt fiber tube, and the pressure rise rate of the explosion-proof liquid is also very slow, which helps to deal with leakage accidents in a timely manner. The explosion-proof liquid design prevents the pressure rise inside the casing from causing a destructive burst that could damage other intact fiber tubes. Therefore, the safety problem of hydrogen storage and transportation is fundamentally solved. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the dual-valve basalt fiber tube hydrogen storage device in the embodiment; Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle; Figure 3 This is a cross-sectional view of a hydrogen storage device with a cylindrical outer shell. Figure 4 This is a cross-sectional view of a hydrogen storage device with a rectangular casing. Figure 5This is a cross-sectional view of the single-valve basalt fiber tube hydrogen storage device in the embodiment.

[0020] Explanation of icon numbers: 1. Inlet valve; 2. Outlet valve; 3. Filter material; 4. Flange ring; 5. Outer flange; 6. Outer shell; 7. Sealing layer; 8. Tube bundle; 9. Pressure end cap; 10. Connecting bolts; 11. Gas sealing ring. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] This embodiment discloses a basalt fiber tube hydrogen storage device, which can be designed as follows: Figure 1 The dual-valve hydrogen storage device shown (i.e., the inlet and outlet are located at opposite ends of the outer casing 6) can also be designed as follows: Figure 5 The single-valve hydrogen storage device shown (i.e., both the inlet and outlet are located at the same end of the outer casing 6). For example... Figure 1 and Figure 2 As shown, the entire hydrogen storage device mainly consists of an outer shell 6, a tube bundle 8 placed inside the outer shell 6, and pressure end caps 9 placed at both ends of the outer shell 6.

[0023] The outer shell 6 is a cylindrical structure with openings at both opposite ends; the outer shell 6 can be a cylindrical body (such as...). Figure 3 (As shown), a rectangular cylinder (such as) can also be used. Figure 4 The shape of the outer casing 6 is not limited to the shape shown (or other shapes). The outer casing 6 in this invention is an explosion-proof liquid-sealed casing. The two open ends of the outer casing 6 form an explosion-proof liquid pressure-sealed structure. An explosion-proof liquid injection port is provided on the outer casing 6, and explosion-proof liquid is injected into the casing 6. The filling pressure of the injected explosion-proof liquid is half of the rated working pressure of the hydrogen storage device. Therefore, in this embodiment, the outer casing 6 only bears half of the rated hydrogen storage pressure of the hydrogen storage device, and the rated hydrogen storage pressure is only borne by each fiber tube in the tube bundle 8 and the pressure end cap 9. Therefore, the outer casing 6 can be made relatively thin. Given that the outer casing 6 needs to withstand a certain pressure, the outer casing 6 is preferably made of metal. To facilitate the connection between the outer casing 6 and the pressure end cap 9, outer casing flanges 5 are respectively provided on the outer walls of both ends of the outer casing 6.

[0024] The tube bundle 8 is formed by bundling together multiple hollow basalt fiber tubes arranged in the same direction. The length of each basalt fiber tube is cut according to the external dimensions of the hydrogen storage container. Each basalt fiber tube in the tube bundle 8 is open at both ends, eliminating the need for melt sealing. To secure all the basalt fiber tubes, flange rings 4 are provided at both ends of the tube bundle 8. The gaps between the tube bundle 8 and the flange rings 4, as well as the gaps between adjacent basalt fiber tubes at the flange rings 4, are sealed by gas pressure (e.g., ...). Figure 2 The sealing layer 7 shown ensures that hydrogen can only be filled into the basalt fiber tubes within the tube bundle 8. The number of basalt fiber tubes in the tube bundle 8 is calculated and determined based on the design dimensions of the outer shell 6, maximizing the number to improve hydrogen storage capacity. The basalt fiber tubes are micron-sized, with a diameter ≤10 micrometers. While finer basalt fiber tubes have higher hollowness, their pressure-bearing capacity decreases. Therefore, a diameter of 8-10 micrometers is preferred, and the hollow area ratio of the basalt fiber tubes should be ≥90%, ideally close to 95%.

[0025] The tube bundle 8 formed above is installed into the outer shell 6. To facilitate the filling of the tube bundle 8, the outer shell 6 in this embodiment is assembled with a split structure, that is, the cylindrical outer shell 6 is divided into two semi-cylinders, and the entire outer shell 6 is formed by splicing the two semi-cylinders. After the tube bundle 8 is put into the outer shell 6, the splicing part of the outer shell 6 needs to be sealed with liquid pressure.

[0026] For assembly Figure 1 The dual-valve hydrogen storage device shown has the following structural configuration: Pressure end caps 9 are respectively installed at both ends of the outer shell 6. Each pressure end cap 9 has an outwardly convex basin-shaped structure. Interfaces for installing auxiliary devices such as gas pipes, valves, and pressure gauges are provided on the basin-shaped structure. These auxiliary devices are installed onto the pressure end caps 9 through these interfaces. A gas impurity filter device or a gas impurity filter material 3 can be installed inside the basin-shaped structure. The filter material 3 filters impurities from the incoming gas, preventing impurities in the gas from clogging the basalt fiber tubes and thus affecting the normal operation of the hydrogen storage device. As a dual-valve hydrogen storage device, the inlet and outlet ends are designed on opposite sides of the outer shell 6. Therefore, each pressure end cap 9 needs to be equipped with accessories such as gas pipes, valves, and pressure gauges. The two ends of the outer shell 6 are designed with a symmetrical structure, allowing for the selection of either side as the inlet end and the other as the outlet end as needed (e.g., ...). Figure 1 In the diagram, the valve on the left side of the air pipe is the inlet valve 1, and the valve on the right side is the outlet valve 2. Since the outer casing 6 has a symmetrical structure on both sides, for simplicity, the assembly of the pressure end cap 9 on one side will be used as an example. The flange ring 4 fits against the outer casing flange 5, and the edge of the pressure end cap 9 fits against the gas pressure sealing surface of the flange ring 4. A gas sealing groove is provided on the gas pressure sealing surface of the flange ring 4, and a gas sealing ring 11 is installed in the gas sealing groove. The pressure end cap 9, flange ring 4, and outer casing flange 5 are fixed together using connecting bolts 10. A liquid pressure seal is applied to the gap between the flange ring 4 and the outer casing flange 5, and a gas pressure seal is applied to the gap between the pressure end cap 9 and the flange ring 4.

[0027] For assembly Figure 5The single-valve hydrogen storage device shown is structurally similar to the aforementioned double-valve hydrogen storage device, except that it only requires the installation of inlet / outlet pipes, inlet / outlet valves, and pressure gauges on one end of the pressure cap 9. The inlet and outlet ends are located on the same end of the outer casing 6. Figure 5 As shown, the left side of the outer casing 6 serves as both the inlet and outlet. It is sufficient to install a gas impurity filter device or fill the gas impurity filter material 3 into the internal space of the basin-shaped structure of the pressure end cover 9 on the left side. The installation method of the pressure end covers 9 at both ends of the outer casing 6 and the sealing treatment at each location can refer to the corresponding design of the dual-valve hydrogen storage device described above. Repeated explanations are omitted here.

[0028] The hydrogen storage device structure designed in this invention is suitable not only for hydrogen storage but also for the storage of other high-pressure gases. The entire outer shell 6 employs a liquid-sealed structure, and the interior of the shell 6 is filled with an explosion-proof liquid. Even if a few basalt fiber tubes in the tube bundle 8 rupture, causing a small amount of hydrogen leakage, the leaked hydrogen is minimal and can only leak into the explosion-proof liquid. This process is very slow, and the pressure rise of the explosion-proof liquid inside the shell 6 is slow; the entire process may take several hours. During this time, the hydrogen storage device can continue to operate stably without affecting the normal operation of the entire hydrogen storage system, and it also provides valuable time for handling the leakage accident. The aforementioned explosion-proof liquid leakage handling design also avoids damage to other intact basalt fiber tubes, thereby reducing potential losses and improving the safety of hydrogen storage and transportation.

[0029] The basalt fiber tube hydrogen storage device described above shall be manufactured according to the following steps. Unless otherwise specified, the assembly shall be carried out in the order given in the manufacturing process.

[0030] Step 1) First, based on the hydrogen storage capacity and storage pressure design requirements, determine the length and diameter of the outer shell 6, determine the number of basalt fiber tubes required in the tube bundle 8, and determine the length of the basalt fiber tubes based on the length of the outer shell 6. Step 2) Arrange the required number of basalt fiber tubes in the same direction to form a tube bundle 8. Fit flange rings 4 at both ends of the tube bundle 8 to bind and fix each basalt fiber tube. Then, perform gas pressure sealing treatment on the gap between the flange rings 4 and the tube bundle 8, as well as between adjacent basalt fiber tubes in the tube bundle 8 at the location of the flange rings 4. Step 3) Given that the basalt fiber tubes used in the tube bundle 8 in this embodiment do not need to be melt-sealed at both ends, and both ends of the tube bundle 8 are bound and fixed by the flange ring 4, in order to facilitate the insertion of the tube bundle 8 into the shell 6, the shell 6 in this embodiment is assembled with a split structure. Therefore, before inserting the tube bundle 8, the shell 6 is first split into two half shells, and then the tube bundle 8 in step 2) is inserted into one half shell, so that the flange ring 4 fits and connects with the shell flange 5, and then the other half shell is assembled. Step 4) Install a pressure end cap 9 at each end of the assembled shell 6, install a gas sealing ring 11 on the gas sealing surface of the flange ring 4, then make the edge of the pressure end cap 9 fit and mate with the flange ring 4 on the same side, and fix the pressure end cap 9, flange ring 4 and shell flange 5 together with connecting bolts 10. In this step, if the manufactured hydrogen storage device is a dual-valve hydrogen storage device, the assembly method of the pressure end cap 9 is as follows: Gas pipes, valves, and pressure gauges are installed on the pressure end caps 9 at both ends of the outer shell 6. The auxiliary devices can be installed on the pressure end caps 9 first, and then the pressure end caps 9 can be installed on the outer shell 6; alternatively, the pressure end caps 9 can be assembled first, and the auxiliary devices installed last. The actual production process will determine the appropriate method. Before installing the pressure end caps 9 on each side, a gas impurity filter device or gas impurity filter material 3 is installed or filled into the space between the pressure end cap 9 and the tube bundle 8.

[0031] In this step, if the manufactured hydrogen storage device is a single-valve hydrogen storage device, the assembly method of the pressure end cap 9 is as follows: only auxiliary devices such as gas pipes, valves and pressure gauges are installed on the pressure end cap 9 at one end of the outer shell 6, and no auxiliary devices are required on the pressure end cap 9 at the other end. Before installing the pressure end cap 9 with auxiliary devices, a gas impurity filter device or gas impurity filter material 3 is added or filled into the space between the pressure end cap 9 and the tube bundle 8.

[0032] Step 5) Perform explosion-proof liquid pressure sealing treatment on the gap between flange ring 4 and outer shell flange 5, perform gas pressure sealing treatment on the gap between pressure end cap 9 and flange ring 4, and perform explosion-proof liquid pressure sealing treatment on the splice of outer shell 6. Step 6) After assembling all the components, finally check the sealing of the outer shell 6. If the sealing is qualified, inject explosion-proof liquid into the inner shell 6. The pressure of the explosion-proof liquid is half of the rated working pressure of the hydrogen storage device.

[0033] Step 7) Conduct a series of routine tests on the assembled hydrogen storage device in accordance with the requirements of standards and specifications. Only after passing the tests can the device be shipped from the factory.

[0034] Step 8) Before filling with hydrogen or other gases, in order to ensure the purity of the gas, the inside of the hydrogen storage device should be evacuated to remove the air inside the device before the gas can be filled.

[0035] During the manufacturing process of the aforementioned hydrogen storage device, each step involving sealing must be inspected and tested after the sealing process is completed to ensure that the sealing performance meets the design requirements for the highest pressure of the hydrogen storage device.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A basalt fiber tube hydrogen storage device, characterized in that: The device comprises a cylindrical outer shell with two open ends and a tube bundle placed inside the shell. The tube bundle is formed by multiple hollow basalt fiber tubes arranged in the same direction. Each basalt fiber tube in the tube bundle is open at both ends. Each end of the tube bundle is provided with a flange ring for binding and fixing the basalt fiber tube. The gap between the flange ring and the tube bundle, as well as the gap between adjacent basalt fiber tubes at the flange ring location, are all gas pressure sealed. Both ends of the outer shell are provided with an outer shell flange and a pressure end cap. The flange ring located on the same side is located between the pressure end cap and the outer shell flange. The pressure end cap, flange ring, and outer shell flange are fixedly connected. The gap between the flange ring and the outer shell flange is liquid pressure sealed, and the gap between the pressure end cap and the flange ring is gas pressure sealed. The outer shell is sealed with explosion-proof liquid and is provided with an explosion-proof liquid injection port. Explosion-proof liquid is injected into the outer shell, and the filling pressure of the explosion-proof liquid injected into the outer shell is half of the rated operating pressure of the hydrogen storage device.

2. The basalt fiber tube hydrogen storage device according to claim 1, characterized in that: The outer shell is assembled from two hollow semi-cylinders, and the joint is sealed by liquid pressure.

3. The basalt fiber tube hydrogen storage device according to claim 1, characterized in that: The diameter of the basalt fiber tube is ≤10 micrometers, and the hollow area of ​​the basalt fiber tube accounts for ≥90%.

4. A basalt fiber tube hydrogen storage device according to claim 3, characterized in that: The hollow area of ​​the basalt fiber tube is between 90% and 95%.

5. A basalt fiber tube hydrogen storage device according to claim 1, characterized in that: The pressure end cap at one end of the outer casing is provided with an interface for installing an inlet / outlet air pipe. An inlet / outlet air pipe is installed at the interface, and a valve is installed on the inlet / outlet air pipe.

6. A basalt fiber tube hydrogen storage device according to claim 5, characterized in that: The pressure end cap with inlet and outlet pipes has a basin-shaped structure that bulges outward. The cavity inside the pressure end cap located at the basin-shaped structure is equipped with a gas impurity filter device or filled with gas impurity filter material.

7. A basalt fiber tube hydrogen storage device according to claim 1, characterized in that: The pressure end caps at both ends of the outer shell are respectively provided with interfaces, and an air pipe is installed at each interface, and a valve is installed on each air pipe.

8. A basalt fiber tube hydrogen storage device according to claim 7, characterized in that: The pressure end caps at both ends of the outer shell are provided with outwardly raised basin-shaped structures, and the cavity inside the basin-shaped structure of each pressure end cap is provided with a gas impurity filtering device or filled with gas impurity filtering material.

9. A method for manufacturing a basalt fiber tube hydrogen storage device as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1) Determine the outer shell size, the number of basalt fiber tubes required in the tube bundle, and their length based on the hydrogen storage capacity and storage pressure design requirements; Step 2) Arrange the required number of basalt fiber tubes in the same direction to form a tube bundle. Fit flange rings at both ends of the tube bundle to bind and fix each basalt fiber tube. Perform gas pressure sealing treatment on the gap between the flange ring and the tube bundle, as well as between adjacent basalt fiber tubes in the tube bundle at the location of the flange ring. Step 3) Disassemble the outer shell into two half shells. First, put the tube bundle from step 2) into one half shell, and fit the flange ring with the outer shell flange. Then, assemble the other half shell. Step 4) Install a pressure end cap at each end of the assembled shell, and fit the edge of the pressure end cap with the flange ring. Secure the pressure end cap, flange ring, and shell flange together with fasteners. Step 5) Perform explosion-proof liquid pressure sealing treatment on the gap between the flange ring and the outer shell flange, perform gas pressure sealing treatment on the gap between the pressure end cap and the flange ring, and perform explosion-proof liquid pressure sealing treatment on the splice of the outer shell. Step 6) Check the sealing of the casing. If the sealing is qualified, inject explosion-proof liquid into the casing.

10. The method for manufacturing a hydrogen storage device according to claim 9, characterized in that: In step 4), gas pipes, valves and pressure gauges are installed on the pressure end caps at both ends of the outer shell. Before installing the pressure end caps on each side, a gas impurity filter device or gas impurity filter material is added to the space between the pressure end cap and the tube bundle. Alternatively, in step 4), the gas pipe, valve, and pressure gauge are installed only on the pressure end cap at one end of the housing, and before installing the pressure end cap on that side, a gas impurity filter device or gas impurity filter material is added to the space between the pressure end cap and the tube bundle.

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