Flexible capillary hydrogen storage device and manufacturing method thereof

Abstract

The application discloses a flexible capillary hydrogen storage device and a manufacturing method thereof, and is characterized in that device components include a framework, a flexible hydrogen storage capillary and a high-pressure-resistant metal connecting piece; wherein both ends of the flexible hydrogen storage capillary are in an open state. The device manufacturing steps include: flexible hydrogen storage capillary single-pipe drawing, flexible hydrogen storage capillary arrangement and flexible hydrogen storage capillary end sealing. Compared with the prior art, the application can realize higher hydrogen storage pressure and higher mass hydrogen storage density, and the device has the advantages of flexible structure, higher safety, no hydrogen embrittlement and the like.

Description

Technical Field

[0001] This invention relates to the field of gas storage device technology, and in particular to a hydrogen storage device with high safety, high pressure resistance, and high hydrogen storage density.

[0002] A flexible capillary hydrogen storage device and its manufacturing method are disclosed. The flexible capillary hydrogen storage device prepared by this invention can realize customized hydrogen storage devices, overcome the technical problems of hydrogen embrittlement and low hydrogen storage density of traditional high-pressure metal hydrogen storage cylinders, and obtain a hydrogen storage device with adjustable flexible structure, high safety performance, high pressure resistance and high quality hydrogen storage density. It can achieve higher hydrogen storage pressure and higher quality hydrogen storage density, while realizing smaller volume, safer and hydrogen embrittle-free hydrogen storage. Background Technology

[0003] Guided by the "dual carbon" goal, hydrogen energy, as a clean, efficient, safe, and sustainable new energy source, has become one of the mainstays of the low-carbon energy system, with enormous application potential in energy, transportation, and industrial production. The hydrogen energy industry chain mainly includes hydrogen production, storage, transportation, and application, with safe and efficient storage being a key aspect of hydrogen energy applications. High-pressure gaseous hydrogen storage is currently a widely used method, but traditional high-pressure gaseous hydrogen storage cylinders suffer from low storage efficiency, low safety, large size, and high cost, limiting their widespread adoption. Oxide glass is considered a cost-effective, safe, and long-term gaseous hydrogen storage material candidate for high-pressure hydrogen storage. Therefore, flexible glass capillary array hydrogen storage technology, with its high storage efficiency, lightweight and high-pressure resistance, absence of hydrogen embrittlement, rapid hydrogen filling and discharging, high safety, and customizable shape, has become an important development direction for high-pressure gaseous hydrogen storage technology in recent years.

[0004] In summary, there is a current need to propose a hydrogen storage device that has higher hydrogen storage pressure and higher mass hydrogen storage density compared with existing high-pressure hydrogen storage devices, and that has advantages such as flexible and adjustable structure, greater safety, and no hydrogen embrittlement. Summary of the Invention

[0005] This invention discloses a flexible capillary hydrogen storage device and its manufacturing method. The device comprises a frame, a flexible hydrogen storage capillary, and a high-pressure-resistant metal connector. Both ends of the flexible hydrogen storage capillary are open.

[0006] The purpose of this invention is to provide a technology for drawing highly consistent thin-walled flexible capillary tubes from quartz tubes, and then arranging the flexible capillary tubes regularly using a wire-laying machine to prepare a flexible capillary hydrogen storage device. This technology achieves higher hydrogen storage pressure, higher mass hydrogen storage density, and safer, non-embrittlement-free hydrogen storage.

[0007] The technical solution adopted in this invention is:

[0008] 1. Flexible hydrogen storage capillary tube drawing. A quartz tube with an outer diameter of 25 mm and a wall thickness of 0.9 mm is drawn into a hollow structure at a temperature of 1900-2100℃. The internal pore diameter is 0.2-0.4 mm, the diameter of the quartz layer is 0.22-0.42 mm, and the diameter of the coating layer is 0.24-0.44 mm.

[0009] 2. Flexible Hydrogen Storage Capillary Arrangement. To improve the mass hydrogen storage density of the hydrogen storage device, a fiber-winding machine is used to arrange flexible hydrogen storage capillary tubes into a high-density, ordered structure. First, a fiber-winding frame with suitable dimensions and structure is designed according to the actual application scenario. Because flexible hydrogen storage capillary tubes have good strength and toughness, they can be wound onto any frame with a diameter greater than 150mm, depending on the actual application scenario. Then, during the arrangement process, the fiber-winding process parameters (such as fiber-winding speed, tension, etc.) need to be designed to obtain a flexible capillary array with an ordered and consistent structure.

[0010] 3. Flexible Hydrogen Storage Capillary End Sealing. The flexible hydrogen storage capillary end is a high-pressure-resistant metal connector. One end connects to the filling / discharging equipment, and the other end connects to the open end of the flexible hydrogen storage capillary, enabling convenient and reliable filling and discharging of the hydrogen storage device from the outside environment. The flexible hydrogen storage capillary end and the high-pressure-resistant metal connector are sealed using epoxy resin adhesive.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The preparation process only requires drawing one specification of flexible glass capillary tube, which greatly simplifies the complexity of device preparation and makes the assembly process simple.

[0013] 2. A resin coating material is added to the outside of the glass capillary, which makes it flexible while improving its pressure resistance.

[0014] 3. Flexible capillaries have the characteristic of flexible movement and can be laid in a customized manner according to actual application scenarios, which greatly improves the space utilization rate of limited space.

[0015] 4. The device is flexible in its design and can release hydrogen at any time by adjusting the metal valve.

[0016] 5. The device has a simple structure and a low failure rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a flexible capillary hydrogen storage device.

[0018] Figure 2 This is a schematic cross-sectional view of a flexible capillary hydrogen storage device.

[0019] Figure 3Schematic diagram of flexible hydrogen storage capillary tube drawing;

[0020] Figure 4 This is a schematic diagram of the bottom view of the framework of a flexible capillary hydrogen storage device.

[0021] Figure 5 Schematic diagram of the packaging of a flexible capillary hydrogen storage device;

[0022] in:

[0023] 1-Flexible hydrogen storage capillary, 2-Flexible capillary hydrogen storage device frame, 3-High pressure resistant metal connector, 4-Quartz tube, 5-Micro pressure system, 6-Coating system, 7-Flexible hydrogen storage capillary quartz layer, 8-Flexible hydrogen storage capillary coating layer, 9-Fiber channel, 10-316L stainless steel, 11-Hydrogen, 12-Epoxy resin adhesive. Detailed Implementation

[0024] The invention will be further described below with reference to the accompanying drawings.

[0025] First, quartz tube (4) with an outer diameter of 25 mm and a wall thickness of 0.9 mm is immersed in hydrofluoric acid with a concentration of 10%-30% for 5-10 minutes to reduce defects and impurities on the glass surface.

[0026] like Figure 3 The diagram illustrates the drawing technology for flexible hydrogen storage capillaries. A quartz tube (4) with an outer diameter of 25 mm and a wall thickness of 0.9 mm, after acid washing, is placed in a drawing tower or similar drawing equipment. The drawing temperature is controlled at 1900–2100 °C, and a positive pressure of 30–60 Pa is applied to the quartz tube (4) via a micro-pressure system (5) to control the wall thickness of the quartz layer in the drawn capillary. After the capillary drawing is stable, the drawing tower coating system (6) is opened to add a coating layer to the thin-walled capillary. The coating layer thickness of the flexible capillary is controlled by designing the dimensions of the mold core in the coating system. In this invention, the mold core diameter is 0.27–0.47 mm. Finally, a flexible hydrogen storage capillary with an internal aperture of 0.2–0.4 mm, a quartz layer diameter of 0.22–0.42 mm, and a coating layer diameter of 0.24–0.44 mm is obtained.

[0027] Then, a suitable wire-laying frame with appropriate size and structure is designed according to the actual application scenario. The frame is a disc with a diameter greater than 150mm (in order to improve the hydrogen storage density of the hydrogen storage device, the disc can be made of lightweight materials such as plastic). At the same time, a fiber-carrying groove (9) is set at the bottom of the frame. After the flexible hydrogen storage capillary is wired by the wire-laying machine, the two ends of the flexible hydrogen storage capillary pass through the round hole of the frame bottom plate, pass through the fiber-carrying groove, and finally pass out through the central through hole of the frame. Thus, in practical applications, a higher hydrogen storage quality can be achieved by connecting the frames in parallel.

[0028] Then, a fiber-laying machine is used to arrange the flexible hydrogen storage capillaries in an orderly manner. During the fiber-laying process, the fiber-laying process parameters need to be designed, with a fiber-laying speed of 10-30 r / min and a tension of 20-40 g, in order to obtain a flexible capillary array with an orderly and consistent structure.

[0029] Then, the flexible hydrogen storage capillary tip is effectively sealed. For example... Figure 5 The diagram illustrates the sealing process for the ends of a flexible hydrogen storage capillary. In this invention, epoxy resin adhesive (12) is used to bond the ends of the flexible hydrogen storage capillary (1). The high-pressure-resistant metal connector (3) has a groove with a depth of at least 1 cm inside. After the two ends (1) of the flexible hydrogen storage capillary are inserted into the groove of the metal connector (3), epoxy resin adhesive is poured in to achieve effective sealing of the ends of the flexible hydrogen storage capillary.

[0030] like Figure 1 The diagram shows the prepared flexible capillary hydrogen storage device. Hydrogen is stored in the flexible hydrogen storage capillary through a high-pressure resistant metal connector (3).

[0031] Implementation Case 1: A quartz tube (4) with an outer diameter of 25 mm and a wall thickness of 0.9 mm was pickled in 10% hydrofluoric acid for 5 min. Then, at a drawing temperature of 1990℃ and a positive pressure of 50 Pa, a thin-walled flexible capillary (1) with an inner diameter of 0.3 mm, a quartz layer diameter of 0.33 mm (7), and a coating layer diameter of 0.36 mm (8) was drawn using a die core with an inner diameter of 0.39 mm. Then, a 1000 m flexible capillary (1) was neatly arranged onto a 160 mm diameter filament frame (2) using a filament ...

[0032] Implementation Case 2: A quartz tube (4) with an outer diameter of 25 mm and a wall thickness of 0.9 mm was pickled in 10% hydrofluoric acid for 5 min. Then, at a drawing temperature of 1980℃ and a positive pressure of 50 Pa, a thin-walled flexible capillary (1) with an inner diameter of 0.32 mm, a quartz layer diameter of 0.345 mm (7), and a coating layer diameter of 0.375 mm (8) was drawn using a die core with an inner diameter of 0.4 mm. Then, a wire arranging machine was used to arrange 1000 m of flexible capillary (1) neatly onto a wire arranging skeleton (2) with a diameter of 160 mm under the conditions of a wire arranging speed of 20 r / min and a tension of 30 g. Then, epoxy resin glue (12) was used to achieve effective sealing of the end of the flexible hydrogen storage capillary. The flexible capillary prepared under these conditions can achieve a pressure resistance of 70 MPa and a mass hydrogen storage density of 6.2%.

Claims

1. A flexible capillary hydrogen storage device, characterized in that: The components include a framework, a flexible hydrogen storage capillary, and high-pressure-resistant metal connectors. Both ends of the flexible hydrogen storage capillary are open.

2. The flexible capillary hydrogen storage device according to claim 1, characterized in that... The flexible hydrogen storage capillary has a hollow internal structure with an internal pore size of 0.2–0.4 mm, a quartz layer diameter of 0.22–0.42 mm, and a coating layer diameter of 0.24–0.44 mm; it is composed of pure quartz glass and resin coating material.

3. The flexible capillary hydrogen storage device according to claim 1, characterized in that... The length of the flexible hydrogen storage capillary is 1 to 1000 m.

4. A flexible capillary hydrogen storage device according to claim 1, characterized in that... This hydrogen storage device can achieve a hydrogen storage density of 1% to 8.6% by mass.

5. A flexible capillary hydrogen storage device according to claim 1, characterized in that... The hydrogen storage device can withstand pressures of 35–100 MPa.

6. A flexible capillary hydrogen storage device according to claim 1, characterized in that... The hydrogen storage device has a 1mm wide pipe channel at the bottom of the frame, which can realize a stable parallel connection between the frames.

7. A method for manufacturing a flexible capillary hydrogen storage device, characterized in that... The flexible hydrogen storage capillary is drawn from a quartz tube with an outer diameter of 25 mm and a wall thickness of 0.9 mm at a drawing temperature of 1900–2100℃.

8. The method for manufacturing a flexible capillary hydrogen storage device according to claim 7, characterized in that... Before drawing, quartz tubes need to be acid-washed in a 10% to 30% hydrofluoric acid solution for 5 to 10 minutes.

9. The method for manufacturing a flexible capillary hydrogen storage device according to claim 7, characterized in that... Positive pressure needs to be applied during the drawing process of flexible capillary tubes, with a positive pressure of 30 to 60 Pa.

10. The method for manufacturing a flexible capillary hydrogen storage device according to claim 7, characterized in that... The coating thickness of the flexible capillary is controlled by the size of the mold core in the coating system. In this invention, the diameter of the mold core is 0.27 to 0.47 mm.

11. The method for manufacturing a flexible capillary hydrogen storage device according to claim 7, characterized in that... After the flexible capillary is drawn, a wire arranging machine is used to arrange the flexible capillary in an orderly manner. The wire arranging speed is 10-30 r / min and the wire arranging tension is 20-40 g.

12. The method for manufacturing a flexible capillary hydrogen storage device according to claim 7, characterized in that... The high-pressure resistant metal connectors in this hydrogen storage device are made of 316L stainless steel.

13. The method for manufacturing a flexible capillary hydrogen storage device according to claim 7, characterized in that... The flexible hydrogen storage capillary is connected to a high-pressure-resistant metal connector by epoxy resin adhesive, serving as the hydrogen inlet.

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