Production method of a liquid hydrogen cylinder and its thermal insulation material

Abstract

The present invention provides a production method of a liquid hydrogen bottle and its thermal insulation material, which relates to the field of cold insulation of liquid hydrogen bottles. It includes an inner container and an outer shell located outside the inner container. A sandwich layer is provided between the outer shell and the inner container. The outer wall of the inner container is coated with a thermal insulation material. One end of the inner container is provided with a fixed seat, and the other end of the inner container is provided with an inner hydrogen discharge pipe. One end of the outer shell close to the inner hydrogen discharge pipe is provided with an outer hydrogen discharge pipe. Heat insulation rings that are slidably installed and adapted are provided on both the inner hydrogen discharge pipe and the fixed seat. A support assembly fixedly connected to the inner wall of the outer shell is provided on the heat insulation ring. An electric telescopic rod is fixedly installed inside the outer shell close to one end of the fixed seat. In the present invention, a separated structure is adopted between the inner container and the outer shell, so that there is no contact between the inner container and the outer shell when the liquid hydrogen bottle of the present invention is in a storage state, thereby effectively reducing heat transfer between the inside and the outside, and further achieving the purpose of keeping the inner container cold.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic insulation for liquid hydrogen cylinders, and particularly to a liquid hydrogen cylinder and a production method of its heat insulation material. Background Art

[0002] Liquid hydrogen cylinders are mainly used to store cryogenic liquid hydrogen. The lowest temperature of the inner liner of the cylinder can reach -253°C. Therefore, in order to store liquid hydrogen in the liquid hydrogen cylinder for a long time, it is necessary to reduce the heat transfer between the liquid hydrogen cylinder and the outside world, so as to achieve the purpose of storing liquid hydrogen for as long as possible.

[0003] A liquid hydrogen cylinder for storing liquid hydrogen usually consists of an outer shell and an inner liner sealed in the cavity of the outer shell. The two end heads of the inner liner are respectively suspended and supported in the cavity of the outer shell through corresponding support structures. A hollow vacuum interlayer is formed between the inner liner and the outer shell. Among them, the support structures at both ends are the main heat transfer structures between the external heat and the inner liner. Therefore, the heat leakage problem caused by the support structures is particularly prominent. Therefore, the present invention proposes a liquid hydrogen cylinder and a production method of its heat insulation material to solve the problems existing in the prior art. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a liquid hydrogen cylinder and a production method of its heat insulation material. The liquid hydrogen cylinder and the production method of its heat insulation material adopt a separated structure between the inner liner and the outer shell, so that there is no contact between the inner liner and the outer shell of the liquid hydrogen cylinder of the present invention in the storage state, thereby effectively reducing the heat transfer between the inner and outer sides, and further achieving the purpose of keeping the inner liner cold.

[0005] To achieve the purpose of the present invention, the present invention is realized through the following technical solutions: A liquid hydrogen cylinder and a production method of its heat insulation material, including an inner liner and an outer shell located outside the inner liner. There is an interlayer between the outer shell and the inner liner. The outer wall of the inner liner is coated with a heat insulation material. One end of the inner liner is provided with a fixed seat, and the other end of the inner liner is provided with an inner hydrogen discharge pipe. One end of the outer shell close to the inner hydrogen discharge pipe is provided with an outer hydrogen discharge pipe. Heat insulation rings are slidably installed on both the inner hydrogen discharge pipe and the fixed seat. A support assembly fixedly connected to the inner wall of the outer shell is provided on the heat insulation ring. An electric telescopic rod is fixed inside the outer shell close to one end of the fixed seat. A sealing joint is provided at the port of the inner hydrogen discharge pipe, and a sealing connection seat is provided at the inner end of the outer hydrogen discharge pipe. The inner diameter of the outer hydrogen discharge pipe is equal to the outer diameter of the inner hydrogen discharge pipe. An electromagnetic valve is provided on the inner hydrogen discharge pipe, and a pipeline valve is provided on the outer hydrogen discharge pipe. A vacuum pump communicating with the interlayer is provided on the outer shell. A controller for controlling the electric telescopic rod, the electromagnetic valve and the vacuum pump is provided on the outer wall of the vacuum pump.

[0006] The heat insulation ring includes a ring body and a group of fiberglass filaments. Four groups of fiberglass filament groups are wound around the ring body in a circular array. The fiberglass filament group is wound by fiberglass filaments.

[0007] A further improvement lies in that: the four groups of the glass fiber filament groups are all arc-shaped, the thickness of the four groups of the glass fiber filament groups is 3-5 mm, and the interval between the four groups of the glass fiber filament groups is 1-1.5 cm.

[0008] A further improvement lies in that: the support assembly includes a support frame, and four groups of the support frames are distributed in a circular array. One ends of the four groups of the support frames are fixedly connected to the outer wall of the ring body at the interval between the support frames and the glass fiber filament groups, and the other ends of the four groups of the support frames are fixedly connected to the inner wall of the housing.

[0009] A further improvement lies in that: the four groups of the support frames are all inclined, and the inclination angle between the four groups of the support frames and the outer wall of the ring body is 26°.

[0010] A further improvement lies in that: the sealing joint includes a first sealing ring and a second sealing ring. The first sealing ring is fixedly connected to the outer wall of the inner hydrogen discharge pipe, and the second sealing ring is vertically arranged on the outer side wall of the first sealing ring.

[0011] A further improvement lies in that: the sealing connection seat includes a first sealing groove and a second sealing groove. A first sealing groove adapted to the first sealing ring is provided at the end face of the inner end of the outer hydrogen discharge pipe, and a second sealing groove adapted to the second sealing ring is vertically arranged in the first sealing groove.

[0012] The production method of the heat insulation material in the above liquid hydrogen bottle includes the following steps;

[0013] S1. Pour graphene, glass fiber cotton and water (white water) into a disperser for dispersion treatment, wherein the dosage of graphene is 0.1-1.0%, and the dosage of glass fiber cotton is 99.9-99%;

[0014] S2. Import the slurry dispersed by the disperser into a batching tank, and add white water thereto to make the concentration of the slurry inside the batching tank 0.05-0.5%;

[0015] S3. Feed the slurry inside the batching tank into a storage tank, and then feed it from the storage tank into a high-level tank. A reflux pipeline is arranged between the high-level tank and the storage tank for the slurry to flow back;

[0016] S4. Feed the slurry inside the high-level tank into a head box, and then discharge it through the head box. At this time, the fiber material is initially formed;

[0017] S5. Perform vacuum dehydration on the formed fiber material. The vacuum degree used for vacuum dehydration is (-0.01)-(-0.05) mpa, and at the same time, apply the discharged white water to S1 and S2;

[0018] S6. Dry the dehydrated fiber material at a drying temperature set between 100°C and 190°C, and then wind up the dried fiber material.

[0019] S7. Finally, laminate the wound limiting material and the aluminum foil to produce the required heat-insulating material.

[0020] The beneficial effects of the present invention are as follows: The present invention adopts a separated structure between the inner container and the outer shell, so that there is no contact between the inner container and the outer shell when the liquid hydrogen bottle of the present invention is in the storage state, thus effectively reducing heat transfer between the inner and outer sides, and further achieving the purpose of keeping the inner container cold. At the same time, when flowing out, the electric telescopic rod is controlled by the controller to push the inner container to move, so that the inner hydrogen discharge pipe is hermetically connected to the outer hydrogen discharge pipe, and then the solenoid valve and the pipeline valve are controlled and manually opened, so that the liquid hydrogen can flow out. When closing, only the inner container, the solenoid valve and the pipeline valve are reset, and then the interlayer is evacuated by the vacuum pump to perform the cold insulation work on the inner container again. At the same time, the outer wall of the inner container is coated with a heat-insulating material, and the heat-insulating material is prepared by combining glass fiber cotton and graphene, and its thermal conductivity is low, further increasing the cold insulation performance of the inner container. Description of the Drawings

[0021] Figure 1 is a cross-sectional view of the present invention.

[0022] Figure 2 is a three-dimensional view of the internal structure of the outer shell of the present invention.

[0023] Figure 3 is a three-dimensional view of the heat-insulating ring of the present invention.

[0024] Figure 4 is a three-dimensional view of the sealing joint of the present invention.

[0025] Figure 5 is a three-dimensional view of the sealing connection seat of the present invention.

[0026] Wherein: 1. Inner container; 2. Outer shell; 3. Interlayer; 4. Heat-insulating material; 5. Fixed seat; 6. Inner hydrogen discharge pipe; 7. Outer hydrogen discharge pipe; 8. Heat-insulating ring; 9. Electric telescopic rod; 10. Sealing joint; 11. Sealing connection seat; 12. Solenoid valve; 13. Pipeline valve; 14. Vacuum pump; 15. Ring body; 16. Glass fiber filament group; 17. Support frame; 18. First sealing ring; 19. Second sealing ring; 20. First sealing groove; 21. Second sealing groove. Detailed Embodiments

[0027] In order to deepen the understanding of the present invention, the following will further describe the present invention in detail with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0028] According toFigure 1 , 2 As shown in Figures 3, 4, and 5, in this embodiment, a production method of a liquid hydrogen bottle and its thermal insulation material is proposed, including an inner liner 1 and an outer shell 2 located outside the inner liner 1. A sandwich layer 3 is provided between the outer shell 2 and the inner liner 1. By evacuating the sandwich layer 3, the sandwich layer 3 is in a vacuum environment, thereby reducing the heat flow from the outside to the inner liner 1. The outer wall of the inner liner 1 is coated with a thermal insulation material 4. By coating the thermal insulation material 4 on the outer wall of the inner liner 1, the cold insulation effect of the inner liner 1 itself is enhanced. One end of the inner liner 1 is provided with a fixing seat 5, and the other end of the inner liner 1 is provided with an inner hydrogen discharge pipe 6. One end of the outer shell 2 close to the inner hydrogen discharge pipe 6 is provided with an outer hydrogen discharge pipe 7. Heat insulation rings 8 that are adapted to each other are slidably installed on both the inner hydrogen discharge pipe 6 and the fixing seat 5. A support assembly fixedly connected to the inner wall of the outer shell 2 is provided on the heat insulation ring 8. An electric telescopic rod 9 is fixedly installed inside the outer shell 2 close to one end of the fixing seat 5. A sealing joint 10 is provided at the port of the inner hydrogen discharge pipe 6, and a sealing connection seat 11 is provided at the inner end of the outer hydrogen discharge pipe 7. The inner diameter of the outer hydrogen discharge pipe 7 is equal to the outer diameter of the inner hydrogen discharge pipe 6. An electromagnetic valve 12 is provided on the inner hydrogen discharge pipe 6, and a pipeline valve 13 is provided on the outer hydrogen discharge pipe 7. A vacuum pump 14 communicating with the sandwich layer 3 is provided on the outer shell 2. The vacuum pump 14 is a micro vacuum pump 14. A controller for controlling the electric telescopic rod 9, the electromagnetic valve 12, and the vacuum pump 14 is provided on the outer wall of the vacuum pump 14.

[0029] In the present invention, the inner liner 1 inside the outer shell 2 is supported by using the heat insulation ring 8 in cooperation with the support assembly. At the same time, an inner hydrogen discharge pipe 6 and an outer hydrogen discharge pipe 7 are respectively provided on the inner liner 1 and the outer shell 2, so that when the liquid hydrogen bottle stores liquid hydrogen, there is no direct connection relationship between the inner liner 1 and the outer shell 2, thereby achieving the purpose of reducing heat transfer, increasing the cold insulation performance of the inner liner 1. When in use, only need to start the electric telescopic rod 9 to push the liquid hydrogen bottle to move, so that the inner hydrogen supply pipe and the outer hydrogen discharge pipe 7 are clamped and sealed, and the electromagnetic valve 12 and the pipeline valve 13 are opened, so that the stored liquid hydrogen can be discharged. If there is still liquid hydrogen inside the inner liner 1 after the hydrogen discharge process ends, at this time, the electromagnetic valve 12 needs to be closed first, and then the pipeline valve 13 is closed. Then start the electric telescopic rod 9 to reset the inner liner 1. Then start the vacuum pump 14 to evacuate the sandwich layer 3, so as to continue to keep the inner liner 1 cold.

[0030] The heat insulation ring 8 includes a ring body 15 and a glass fiber filament group 16. Four groups of glass fiber filament groups 16 are wound around the ring body 15 in a circular array. The glass fiber filament group 16 is formed by winding glass fiber filaments. By winding four groups of glass fiber filament groups 16 on the ring body 15, the outer walls of the fixed seat 5 and the inner hydrogen discharge pipe 6 do not directly contact the inner wall of the ring body 15, but contact the glass fiber filament group 16. Since the glass fiber filaments have a low conduction coefficient, the fixed seat 5 and the hydrogen discharge pipe in contact with the glass fiber filament group 16 can reduce the heat conduction to the inner container 1, achieving the purpose of keeping the connection end of the inner container 1 cold.

[0031] The four groups of glass fiber filament groups 16 are all arc-shaped. The thickness of the four groups of glass fiber filament groups 16 is 3 - 5 mm. The distance between the four groups of glass fiber filament groups 16 is 1 - 1.5 cm. The thickness of the glass fiber filament group 16 determines the distance between the inner wall of the ring body 15 and the outer walls of the fixed seat 5 and the inner hydrogen discharge pipe 6. The optimal thickness of the glass fiber group is 5 mm.

[0032] The support assembly includes a support frame 17. Four groups of support frames 17 are distributed in a circular array. One end of the four groups of support frames 17 is fixedly connected to the outer wall of the ring body 15 at the interval between the glass fiber filament groups 16, and the other end of the four groups of support frames 17 is fixedly connected to the inner wall of the outer shell 2. By supporting the ring body 15 through the support frame 17, the inner container 1 is further supported.

[0033] The four groups of support frames 17 are all inclined. The inclination angle between the four groups of support frames 17 and the outer wall of the ring body 15 is 26°. The inclined support frame 17 has a better supporting effect on the ring body 15, and at the same time its load-bearing capacity is also greater, ensuring that the inner container 1 can be stably located in the outer shell 2.

[0034] The sealing joint 10 includes a first sealing ring 18 and a second sealing ring 19. The first sealing ring 18 is fixedly connected to the outer wall of the inner hydrogen discharge pipe 6, and the second sealing ring 19 is vertically arranged on the outer side wall of the first sealing ring 18.

[0035] The sealing connection seat 11 includes a first sealing groove 20 and a second sealing groove 21. A first sealing groove 20 adapted to the first sealing ring 18 is provided at the end face of the inner end of the outer hydrogen discharge pipe 7, and a second sealing groove 21 adapted to the second sealing ring 19 is vertically arranged in the first sealing groove 20. By inserting the first sealing ring 18 into the first sealing groove 20 and simultaneously inserting the second sealing ring 19 into the second sealing groove 21, and then cooperating with the pressure provided by the electric telescopic rod 9, a double seal is formed, thereby ensuring the sealing performance at the connection between the sealing joint 10 and the sealing connection seat 11 and preventing hydrogen from overflowing when flowing out.

[0036] The production method of the heat insulation material 4 in the above liquid hydrogen bottle includes the following steps:

[0037] S1. Pour graphene, glass fiber cotton, and white water into a disperser for dispersion. The dosage of graphene is 0.1 - 1.0%, and the dosage of glass fiber cotton is 99.9 - 99%.

[0038] S2. Import the slurry dispersed by the disperser into a batching tank, and add white water to it to make the slurry concentration inside the batching tank 0.05 - 0.5%.

[0039] S3. Send the slurry inside the batching tank into a storage tank, and then send it from the storage tank to a high - level tank. A reflux pipeline is set between the high - level tank and the storage tank for the slurry to flow back.

[0040] S4. Send the slurry inside the high - level tank into a headbox, and then discharge it through the headbox. At this time, the fiber material is initially formed.

[0041] S5. Perform vacuum dewatering on the formed fiber material. The vacuum degree used for vacuum dewatering is (-0.01) - (-0.05) mpa, and at the same time, apply the discharged white water to S1 and S2.

[0042] S6. Dry the dewatered fiber material. The drying temperature is set at 100°C - 190°C, and then wind up the dried fiber material.

[0043] S7. Finally, laminate the wound - up limiting material with aluminum foil to produce the required thermal insulation material 4.

[0044] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above - mentioned embodiments. What is described in the above - mentioned embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid hydrogen bottle, comprising an inner liner (1) and an outer shell (2) located outside the inner liner (1), characterized in that: A sandwich layer (3) is provided between the outer shell (2) and the inner tank (1). The outer wall of the inner tank (1) is coated with a heat-insulating material (4). One end of the inner tank (1) is provided with a fixed seat (5), and the other end of the inner tank (1) is provided with an inner hydrogen discharge pipe (6). One end of the outer shell (2) close to the inner hydrogen discharge pipe (6) is provided with an outer hydrogen discharge pipe (7). Heat-insulating rings (8) that are adapted to each other are slidably installed on both the inner hydrogen discharge pipe (6) and the fixed seat (5). A support assembly fixedly connected to the inner wall of the outer shell (2) is provided on the heat-insulating ring (8). An electric telescopic rod (9) is fixed inside one end of the outer shell (2) close to the fixed seat (5). A sealing joint (10) is provided at the port of the inner hydrogen discharge pipe (6). A sealing connection seat (11) is provided at the inner end of the outer hydrogen discharge pipe (7). The inner diameter of the outer hydrogen discharge pipe (7) is equal to the outer diameter of the inner hydrogen discharge pipe (6). An electromagnetic valve (12) is provided on the inner hydrogen discharge pipe (6), and a pipeline valve (13) is provided on the outer hydrogen discharge pipe (7). A vacuum pump (14) communicating with the sandwich layer (3) is provided on the outer shell (2). A controller for controlling the electric telescopic rod (9), the electromagnetic valve (12), and the vacuum pump (14) is provided on the outer wall of the vacuum pump (14); The heat-insulating ring (8) includes a ring body (15) and a glass fiber filament group (16). Four groups of glass fiber filament groups (16) are wound around the ring body (15) in a circular array. The glass fiber filament group (16) is wound by glass fiber filaments.

2. The hydrogen liquid bottle according to claim 1, wherein: The four groups of glass fiber filament groups (16) are all arc-shaped. The thickness of the four groups of glass fiber filament groups (16) is 3-5 mm, and the interval between the four groups of glass fiber filament groups (16) is 1-1.5 cm.

3. The hydrogen liquid bottle according to claim 2, wherein: The support assembly includes a support frame (17). Four groups of support frames (17) are distributed in a circular array. One end of the four groups of support frames (17) is fixedly connected to the outer wall of the ring body (15) at the interval between the glass fiber filament groups (16), and the other end of the four groups of support frames (17) is fixedly connected to the inner wall of the outer shell (2).

4. A liquid hydrogen cylinder according to claim 3, characterized in that: The four groups of support frames (17) are all inclined. The inclination angle between the four groups of support frames (17) and the outer wall of the ring body (15) is 26°.

5. A liquid hydrogen cylinder according to claim 1, characterized in that: The sealing joint (10) includes a first sealing ring (18) and a second sealing ring (19). The first sealing ring (18) is fixedly connected to the outer wall of the inner hydrogen discharge pipe (6), and the second sealing ring (19) is vertically arranged on the outer side wall of the first sealing ring (18).

6. A liquid hydrogen cylinder according to claim 5, characterized in that: The sealing connection seat (11) includes a first sealing groove (20) and a second sealing groove (21). A first sealing groove (20) adapted to the first sealing ring (18) is provided at the end face of the inner end of the outer hydrogen discharge pipe (7), and a second sealing groove (21) adapted to the second sealing ring (19) is vertically arranged in the first sealing groove (20).

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