Single valve basalt fiber pipe hydrogen storage device and manufacturing method

Abstract

The application relates to a single-valve basalt fiber pipe hydrogen storage device and a manufacturing method. A plurality of basalt fiber pipes with one end closed are bundled and placed in a pressure-bearing shell, the open end of the bundle is fixed through a flange ring, gas pressure sealing is performed between the bundle and the flange ring and between each basalt fiber pipe at the position of the flange ring, gas pressure sealing is performed between the flange ring and a pressure end cover, explosion-proof liquid pressure sealing is performed between the flange ring and a shell flange, explosion-proof liquid pressure sealing is performed between a bottom cover plate and the shell flange at a non-gas inlet and outlet end of the shell, explosion-proof liquid is injected into the shell, an interface for mounting a gas inlet and outlet pipe is arranged on the pressure end cover, the gas inlet and outlet pipe is mounted at the interface, and a valve is mounted on the gas inlet and outlet pipe. The application adopts micron-level basalt fiber pipe hydrogen storage, has higher hollow degree and pressure-bearing capacity, is beneficial to improving the hydrogen storage mass ratio, has obvious economic advantages, and has higher hydrogen storage and transportation safety.

Description

Technical Field

[0001] This invention relates to high-pressure hydrogen storage containers, specifically to a single-valve 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." The patent describes a housing with one open end and a sealed end, made of borosilicate glass. An array of glass fiber tubes is inserted into the open end of the housing. Heating the sealed end of the housing causes the end of the glass fiber tube array furthest from the inlet to fuse with the sealed end, forming a closed end. The open end of the housing is sealed using a metal plug and several sealing rings. According to the structure designed in this patent, [further details about the device would follow]. Figure 1 As can be seen, the length of the shell is greater than the length of the glass fiber tube array because space needs to be reserved for the insertion of the metal plug, and there is a certain space between the air inlet end of the glass fiber tube array and the metal plug. This structure has the following drawbacks: (1) One end of the shell is a sealed end, and the other end is also sealed. The shell becomes a completely sealed structure. Once an individual glass fiber tube in the glass fiber tube array breaks, the released hydrogen gas will increase the pressure on the shell. The pressure inside the shell rises and is prone to causing destructive bursts, thereby damaging other intact glass fiber tubes. (2) Both the fiber tubes and the shell for storing hydrogen are silicates. The glass fiber tube array needs to be sealed by heating the sealed end of the shell to melt the two together. This can easily lead to deformation of the sealed end of the shell. Furthermore, if the melted end of an individual fiber tube in the glass fiber tube array is not completely sealed, it is difficult to detect and remedy the situation. 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 designed a single-valve basalt fiber tube hydrogen storage device, which can improve the hydrogen storage mass ratio and enhance the safety of the hydrogen storage device.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A single-valve basalt fiber tube hydrogen storage device includes a cylindrical outer shell open at both ends, a tube bundle placed inside the shell, a pressure end cap placed at the gas inlet and outlet ends of the shell, and a bottom cover plate placed at the non-gas inlet and outlet ends of the shell. The tube bundle is formed by multiple hollow basalt fiber tubes arranged in the same direction. All basalt fiber tubes are open at the gas inlet and outlet ends of the shell and closed at the non-gas inlet and outlet ends. A flange ring is provided on the tube bundle facing the gas inlet and outlet ends of the shell. A shell flange is provided at both ends of the shell. Gas pressure sealing is performed between the tube bundle and the flange ring, as well as between each basalt fiber tube at the flange ring position. The flange ring is located between the pressure end cap and the pressure end cap. Gas pressure sealing is performed between the outer casing flanges at the gas inlet and outlet ends of the outer casing, and between the flange ring and the pressure end cover. Explosion-proof liquid pressure sealing is performed between the flange ring and the outer casing flanges at the gas inlet and outlet ends of the outer casing. The bottom cover plate is an explosion-proof liquid pressure sealing type cover plate. A buffer pad is installed on the inner wall of the bottom cover plate facing the tube bundle. Explosion-proof liquid pressure sealing is performed between the bottom cover plate and the outer casing flanges at the non-gas inlet and outlet ends of the outer casing. Explosion-proof liquid is injected into the inner casing. The filling pressure of the explosion-proof liquid is half of the rated working pressure of the hydrogen storage device. The pressure end cover is provided with an interface for installing gas inlet and outlet pipes. Gas inlet and outlet pipes are installed at the interface, and valves are installed on the gas inlet and outlet pipes.

[0008] Furthermore, the diameter of the basalt fiber tube is ≤10 micrometers, and the hollow area of ​​the basalt fiber tube accounts for ≥90%.

[0009] Furthermore, the hollow area of ​​the basalt fiber tube accounts for 90% to 95%.

[0010] Furthermore, the pressure end cap 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 filtering device or filled with gas impurity filtering material.

[0011] Furthermore, the outer casing is made of metal.

[0012] Furthermore, a pressure gauge is installed on the pressure end cap.

[0013] Furthermore, the contact surface between the flange ring and the pressure end cover is provided with a gas sealing ring, and the pressure end cover, flange ring, and outer flange are fixedly connected by fasteners.

[0014] Furthermore, the bottom cover plate is fixedly connected to the outer flange at the non-air inlet / outlet end of the outer casing by fasteners.

[0015] The present invention also discloses a method for manufacturing the above-mentioned single-valve basalt fiber tube hydrogen storage device, comprising the following: 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) Melt and seal one end of each basalt fiber tube, leaving the other end open; Step 3) Arrange the required number of basalt fiber tubes in the same direction to form a tube bundle, with the closed end of each basalt fiber tube facing the same side. Set a flange ring on one side of the open end of the basalt fiber tube 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 each adjacent basalt fiber tube in the tube bundle at the location of the flange ring. Step 4) Insert the tube bundle completed in Step 3) into the shell with both ends open, so that the flange ring fits against the shell flange at the air inlet and outlet ends of the shell, and set the pressure end cap on the outside of the flange ring. Fix the pressure end cap, flange ring and shell flange with fasteners. Step 5) Perform explosion-proof liquid pressure sealing treatment on the gap between the flange ring and the outer flange, and perform gas pressure sealing treatment on the gap between the pressure end cap and the flange ring. Step 6) Place the bottom cover plate on the non-air inlet / outlet end of the housing and fix the bottom cover plate to the housing flange on the non-air inlet / outlet end of the housing with fasteners. Then, perform explosion-proof liquid pressure sealing treatment on the gap between the bottom cover plate and the housing flange. Step 7) Check the sealing of the casing. If the sealing is qualified, inject explosion-proof liquid into the casing.

[0016] Furthermore, in step 4), when installing the pressure end cap, a gas impurity filter device or gas impurity filter material is added to the internal space of the basin-shaped structure of the pressure end cap.

[0017] This invention utilizes micron-sized basalt fiber tubes bundled into tubes, cut to appropriate lengths, and placed within a pressure-bearing outer shell. The other end of the tube bundle is then melt-sealed. Using basalt fiber tubes for hydrogen storage achieves a porosity of nearly 95%, and the micron-sized basalt fiber tubes can withstand pressures up to 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 performance of carbon fiber-wound aluminum alloy-lined hydrogen storage containers. Compared to carbon fiber, the inexpensive basalt material offers significant economic advantages. Besides the superior material selection, the structural design of this invention allows the outer shell to bear only half of the rated pressure of the hydrogen storage device. The rated hydrogen storage pressure is borne solely by the basalt fiber tubes, allowing the outer shell to be made relatively thin. This significantly reduces the weight of the container shell, contributing to a higher hydrogen storage mass ratio and better economic efficiency. Furthermore, to improve the safety of hydrogen storage, the outer shell and bottom cover of this invention adopt an explosion-proof liquid pressure sealing structure. Even if individual basalt fiber tubes rupture and cause hydrogen leakage, the leakage will only enter the explosion-proof liquid inside the shell, 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 will not affect the normal operation of the entire hydrogen storage system. 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 design of the explosion-proof liquid prevents the pressure rise inside the shell 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

[0018] Figure 1 This is a cross-sectional view of the single-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 for Figure 1 Enlarged view of a section at point B in the middle; Figure 4 This is a cross-sectional view of a hydrogen storage device with a cylindrical outer shell. Figure 5 This is a cross-sectional view of a hydrogen storage device with a rectangular casing.

[0019] Explanation of icon numbers: 1. Valve; 2. Pressure end cap; 3. Filter material; 4. Flange ring; 5. Outer flange; 6. Outer shell; 7. Sealing layer; 8. Tube bundle; 9. Buffer pad; 10. Bottom cover plate; 11. Sealing ring; 12. Connecting bolts. Detailed Implementation

[0020] 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.

[0021] This embodiment discloses a single-valve basalt fiber tube hydrogen storage device, such as... Figure 1 As shown, it mainly consists of an outer shell 6, a tube bundle 8 placed inside the outer shell 6, a pressure end cap 2, a bottom cover plate 10, and a valve 1. The outer shell 6 is a thin-walled metal cylindrical structure with open ends on both sides. The outer shell 6 can be a cylindrical body (such as...) Figure 4 (As shown), a rectangular cylinder (such as) can also be used. Figure 5 (as shown) or other shapes, the shape of the housing 6 is not limited. The housing 6 in this invention only bears half of the rated hydrogen storage pressure of the hydrogen storage device, and the rated hydrogen storage pressure is borne only by each fiber tube in the tube bundle 8. Therefore, the housing 6 can be made relatively thin, and the two open ends of the housing 6 form an explosion-proof liquid pressure seal structure.

[0022] The tube bundle 8 is formed by 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. Since the inlet and outlet ends of the hydrogen storage device designed in this invention are both on the same side of the outer shell 6, and valve 1 is used to control both hydrogen inlet and outlet, the non-inlet / outlet ends of the hydrogen storage device need to be sealed accordingly. This invention employs a melting and sealing process on the end of each basalt fiber tube in the tube bundle 8 furthest from the inlet / outlet end of the outer shell 6, leaving only the side facing the inlet / outlet end open. To fix the individual basalt fiber tubes in the tube bundle 8, a flange ring 4 is installed near the inlet / outlet end of the tube bundle 8, sealing the gap between the tube bundle 8 and the flange ring 4, as well as the gaps between the individual basalt fiber tubes at the flange ring 4 location, with gas pressure sealing (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%.

[0023] The aforementioned tube bundle 8 is installed into the outer casing 6. The open end of the outer casing 6 near the opening of the tube bundle 8 is called the air inlet / outlet end, and the open end of the outer casing 6 near the closed end of the tube bundle 8 is called the non-air inlet / outlet end. Figures 1 to 3As shown, to facilitate the closure of the two open ends of the outer casing 6, outer casing flanges 5 are provided circumferentially on the outer walls of both the inlet / outlet and non-inlet / outlet ends of the outer casing 6. A pressure end cap 2 is provided at the inlet / outlet end of the outer casing 6, and a bottom cover plate 10 is provided at the non-inlet / outlet end. The shape of the bottom cover plate 10 is designed to match the cross-sectional shape of the non-inlet / outlet end of the outer casing 6, and the outer circumferential edge of the bottom cover plate 10 can align with the outer casing flange 5 at the non-inlet / outlet end of the outer casing 6. A flexible buffer pad 9 (such as a rubber pad) is provided on the inner wall of the bottom cover plate 10 (i.e., the side wall near the closed end of the tube bundle 8). The buffer pad 9 protects the closed end of the basalt fiber tube. Figure 3 As shown, the outer edge of the bottom cover plate 10 is fitted against the outer flange 5 of the non-inlet / outlet end of the housing, and the bottom cover plate 10 is fixedly connected to the housing 6 with fasteners (connecting bolts 12). The gap between the bottom cover plate 10 and the outer flange 6 of the non-inlet / outlet end of the housing 6 is sealed with explosion-proof liquid pressure. The explosion-proof liquid pressure seal connection between the bottom cover plate 10 and the housing 6 also facilitates the inspection of the closed end status of the basalt fiber tubes in the tube bundle 8. If a problem is found in the closed end of an individual basalt fiber tube, it can be remedied in time. The bottom cover plate 10 in this invention is an explosion-proof liquid pressure seal type cover plate, which only bears half of the rated pressure of the hydrogen storage device.

[0024] like Figure 1 and Figure 2 As shown, the sealing structure design for the inlet and outlet ends of the outer casing 6 is as follows: A flange ring 4 is positioned between the pressure end cap 2 and the outer casing flange 5 at the inlet and outlet ends. One side of the flange ring 4 is fitted with the outer casing flange 5, and the other side is fitted with the pressure end cap 2. The pressure end cap 2, flange ring 4, and outer casing flange 5 at the inlet and outlet ends are fixedly connected by fasteners (such as connecting bolts 12). A gas sealing ring 11 is provided on the contact surface between the flange ring 4 and the pressure end cap 2, creating a gas pressure seal between the flange ring 4 and the pressure end cap 2. The gap between the flange ring 4 and the outer casing flange 5 at the inlet and outlet ends of the outer casing 6 is treated with an explosion-proof liquid pressure seal, but this gap only withstands half the working pressure of the hydrogen storage device, while the gas pressure seal must be able to withstand the highest test pressure of the hydrogen storage device. After this sealing treatment, the high-pressure hydrogen gas introduced into the outer casing 6 from the inlet and outlet ends is stored only in each basalt fiber tube.

[0025] As described above, the pressure end cap 2 has an outwardly convex basin-shaped structure. Interfaces for installing auxiliary devices such as inlet / outlet pipes, valves, and pressure gauges are provided on this basin-shaped structure. These auxiliary devices are installed onto the pressure end cap 2 through these interfaces. A gas impurity filtration device or gas impurity filtration material 3 can be installed within the internal space of the basin-shaped structure. The filtration 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.

[0026] Further design optimization considers the possibility of minor hydrogen leakage due to ruptures in individual basalt fiber tubes. To prevent the leaked hydrogen from mixing with oxygen and forming a hazard, this invention incorporates an explosion-proof liquid injection port on the outer shell 6. Explosion-proof liquid is injected into the shell 6 through this port, with the filling pressure being half the rated operating pressure of the hydrogen storage device. The entire outer shell 6 employs a liquid-sealed structure, ensuring that the leaked hydrogen is minimal and can only leak into the explosion-proof liquid. This process is very slow, with the pressure rise of the explosion-proof liquid inside the shell 6 occurring gradually. The entire process may take several hours, during which time the hydrogen storage device can continue to operate stably without affecting the normal operation of the entire hydrogen storage system, providing valuable time for handling any leaks. This explosion-proof liquid leakage handling design also prevents damage to other intact basalt fiber tubes, thereby reducing potential losses and improving the safety of hydrogen storage and transportation.

[0027] The hydrogen storage device structure designed in this invention is not only suitable for hydrogen storage, but also for the storage of other high-pressure gases.

[0028] The hydrogen storage device with the above structure 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.

[0029] 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) Seal one end of each basalt fiber tube by high-temperature melting, while leaving the other end open to allow hydrogen to be filled into the fiber tube; Step 3) Arrange the required number of basalt fiber tubes in the same direction to form a tube bundle 8. When arranging, make the closed end of each basalt fiber tube face the same side. Set a flange ring 4 on one side of the open end of the basalt fiber tube and tie and fix each basalt fiber tube with the flange ring 4. Then, perform gas pressure sealing treatment on the gap between the flange ring 4 and the tube bundle 8 and between each adjacent basalt fiber tube in the tube bundle 8 at the location of the flange ring 4. Step 4) Insert the tube bundle 8 (completed in step 3) into the outer shell 6, which is open at both ends, and make the flange ring 4 fit against the outer shell flange 5 at the air inlet and outlet ends of the outer shell 6. Set a pressure end cap 2 with interfaces for auxiliary devices such as air inlet and outlet pipes, valve 1, and pressure gauge on the outside of the flange ring 4. Install a gas impurity filter device or fill the internal space of the basin-shaped structure of the pressure end cap 2 with gas impurity filter material 3. Then fix the pressure end cap 2, flange ring 4, and outer shell flange 5 with connecting bolts 12. In this step, the auxiliary device can be installed on the pressure end cover 2 first, and then the pressure end cover 2 can be installed, or the pressure end cover 2 can be installed first, and then the auxiliary device can be installed on the pressure end cover 2. In actual production, the appropriate production process should be followed.

[0030] Step 5) Perform explosion-proof liquid pressure sealing treatment on the gap between flange ring 4 and outer flange 5, and perform gas pressure sealing treatment on the gap between pressure end cap 2 and flange ring 4. Step 6) Place the bottom cover plate 10 at the non-inlet / outlet end of the housing 6, with the side of the bottom cover plate 10 with the buffer pad 9 facing the closed end of the tube bundle 8. Fit the outer edge of the bottom cover plate 10 with the housing flange 5 at the non-inlet / outlet end of the housing 6, and fix the bottom cover plate 10 to the housing flange 5 at the non-inlet / outlet end of the housing 6 with the connecting bolts 12. Then, perform explosion-proof liquid pressure sealing treatment on the gap between the bottom cover plate 10 and the housing flange 5. Step 7) After assembling all the components, finally check the sealing of the outer casing 6. If the sealing is qualified, inject explosion-proof liquid into the inner casing 6. The pressure of the explosion-proof liquid is half of the rated working pressure of the hydrogen storage device.

[0031] 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.

[0032] 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 single-valve basalt fiber tube hydrogen storage device, characterized in that: The system includes a cylindrical outer shell open at both ends, a tube bundle placed inside the shell, a pressure end cap at the inlet and outlet ends of the shell, and a bottom cover plate at the non-inlet and outlet ends of the shell. The tube bundle is formed by multiple hollow basalt fiber tubes arranged in the same direction. All basalt fiber tubes are open at the inlet and outlet ends of the shell and closed at the non-inlet and outlet ends. A flange ring is provided on the tube bundle facing the inlet and outlet ends of the shell. Shell flanges are provided at both ends of the shell. Gas pressure sealing is performed between the tube bundle and the flange ring, as well as between each basalt fiber tube at the flange ring location. The flange ring is located between the pressure end cap and the inlet and outlet ends of the shell. Gas pressure sealing is performed between the outer flanges and between the flange ring and the pressure end cap. Explosion-proof liquid pressure sealing is performed between the flange ring and the outer flanges at the gas inlet and outlet ends of the outer casing. The bottom cover plate is an explosion-proof liquid pressure sealing type cover plate. A buffer pad is installed on the inner wall of the bottom cover plate facing the tube bundle. Explosion-proof liquid pressure sealing is performed between the bottom cover plate and the outer flanges at the non-gas inlet and outlet ends of the outer casing. Explosion-proof liquid is injected into the outer casing. The filling pressure of the explosion-proof liquid is half of the rated working pressure of the hydrogen storage device. The pressure end cap is provided with an interface for installing gas inlet and outlet pipes. Gas inlet and outlet pipes are installed at the interface, and valves are installed on the gas inlet and outlet pipes.

2. The single-valve 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%.

3. A single-valve basalt fiber tube hydrogen storage device according to claim 2, characterized in that: The hollow area of ​​the basalt fiber tube is between 90% and 95%.

4. The single-valve basalt fiber tube hydrogen storage device according to claim 1, characterized in that: The pressure end cap 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 filtering device or filled with gas impurity filtering material.

5. A single-valve basalt fiber tube hydrogen storage device according to claim 1, characterized in that: The outer shell is made of metal.

6. A single-valve basalt fiber tube hydrogen storage device according to claim 1, characterized in that: A pressure gauge is installed on the pressure end cap.

7. A single-valve basalt fiber tube hydrogen storage device according to claim 1, characterized in that: The contact surface between the flange ring and the pressure end cover is provided with a gas sealing ring, and the pressure end cover, flange ring, and outer flange are fixedly connected by fasteners.

8. A single-valve basalt fiber tube hydrogen storage device according to claim 1, characterized in that: The bottom cover plate is fixedly connected to the outer flange at the non-air inlet / outlet end of the outer casing by fasteners.

9. The method for manufacturing a single-valve basalt fiber tube hydrogen storage device as described in any one of claims 1-8, characterized in that, Includes the following: 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) Melt and seal one end of each basalt fiber tube, leaving the other end open; Step 3) Arrange the required number of basalt fiber tubes in the same direction to form a tube bundle, with the closed end of each basalt fiber tube facing the same side. Set a flange ring on one side of the open end of the basalt fiber tube 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 each adjacent basalt fiber tube in the tube bundle at the location of the flange ring. Step 4) Insert the tube bundle completed in Step 3) into the shell with both ends open, so that the flange ring fits against the shell flange at the air inlet and outlet ends of the shell, and set the pressure end cap on the outside of the flange ring. Fix the pressure end cap, flange ring and shell flange with fasteners. Step 5) Perform explosion-proof liquid pressure sealing treatment on the gap between the flange ring and the outer flange, and perform gas pressure sealing treatment on the gap between the pressure end cap and the flange ring. Step 6) Place the bottom cover plate on the non-air inlet / outlet end of the housing and fix the bottom cover plate to the housing flange on the non-air inlet / outlet end of the housing with fasteners. Then, perform explosion-proof liquid pressure sealing treatment on the gap between the bottom cover plate and the housing flange. Step 7) Check the sealing of the casing. If the sealing is qualified, inject explosion-proof liquid into the casing.

10. The manufacturing method according to claim 9, characterized in that: In step 4), when installing the pressure end cap, a gas impurity filter device or gas impurity filter material is added to the internal space of the basin-shaped structure of the pressure end cap.

Images