Lossless liquid hydrogen storage system

Abstract

The invention provides a lossless liquid hydrogen storage system. The lossless liquid hydrogen storage system comprises a liquid hydrogen container, a first pipeline, a hydrogen liquefying device, a second pipeline, a liquid hydrogen circulating pump, a third pipeline and a fourth pipeline. One end of the first pipeline is communicated with the top of the liquid hydrogen container. The input end of the hydrogen liquefying device is communicated with the end, away from the liquid hydrogen container, of the first pipeline, and the hydrogen liquefying device is used for converting gaseous hydrogen conveyed by the top gas outlet pipe into liquid hydrogen. And the second pipeline is communicated with the output end of the hydrogen liquefying device. And the input end of the liquid hydrogen circulating pump communicates with the end, away from the hydrogen liquefaction device, of the second pipeline, gaseous hydrogen enters the hydrogen liquefaction device from the first pipeline, is liquefied again and then is conveyed back to the bottom of the liquid hydrogen container through the liquid hydrogen circulating pump, the third pipeline and the fourth pipeline, and therefore waste of hydrogen resources is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen energy storage equipment, and in particular to a loss-free liquid hydrogen storage system. Background Art

[0002] Low-temperature hydrogen storage is one of the ways to store hydrogen. During the storage and application of liquid hydrogen, since liquid hydrogen containers, pipelines, equipment, etc. cannot be completely insulated, the heat in the environment will be introduced into the liquid hydrogen container, causing the inner wall of the liquid hydrogen container and the liquid hydrogen near the liquid surface to be locally heated and the temperature to be high, resulting in local evaporation of liquid hydrogen to form gaseous hydrogen, which leads to an increase in the internal pressure of the liquid hydrogen container. When the pressure in the liquid hydrogen container reaches a safe value, the gaseous hydrogen needs to be discharged through a safety pressure relief device, which will lead to a waste of hydrogen resources and also pose certain safety risks. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a loss-free liquid hydrogen storage system, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems in the prior art.

[0004] The present invention provides a loss-free liquid hydrogen storage system.

[0005] Preferably, a loss-free liquid hydrogen storage system comprises:

[0006] liquid hydrogen container;

[0007] a first pipeline, one end of which is in communication with the top of the liquid hydrogen container;

[0008] A hydrogen liquefaction device, wherein the input end of the hydrogen liquefaction device is connected to an end of the first pipeline away from the liquid hydrogen container, and the hydrogen liquefaction device is used to convert the gaseous hydrogen transported by the top first pipeline into liquid hydrogen;

[0009] a second pipeline, the second pipeline being in communication with an output end of the hydrogen liquefaction device;

[0010] a liquid hydrogen circulation pump, wherein an input end of the liquid hydrogen circulation pump is connected to an end of the second pipeline away from the hydrogen liquefaction device, and the liquid hydrogen circulation pump is used to pump liquid hydrogen;

[0011] a third pipeline, the third pipeline being in communication with an output end of the liquid hydrogen circulation pump and provided with a check valve; and

[0012] a fourth pipeline, one end of which is connected to an end of the third pipeline away from the liquid hydrogen circulation pump, and the other end of which is connected to the bottom of the liquid hydrogen container;

[0013] Control valves are provided on the first pipeline and the fourth pipeline.

[0014] Preferably, it also includes:

[0015] a fifth pipeline, one end of which is in communication with an end of the third pipeline away from the liquid hydrogen circulation pump, and the other end of which is in communication with the top of the liquid hydrogen container;

[0016] The fifth channel is provided with a control valve.

[0017] Preferably, it also includes:

[0018] a sixth pipeline, both ends of which are closed and which is connected to the fourth pipeline;

[0019] a plurality of seventh pipes, one ends of the plurality of seventh pipes being simultaneously connected to the sixth pipe, and the other ends of the plurality of seventh pipes being inserted into the liquid hydrogen container; and

[0020] A plurality of U-shaped tubes, each of the plurality of U-shaped tubes corresponds to the plurality of seventh pipes one by one, and the plurality of U-shaped tubes are arranged in parallel in the liquid hydrogen container, the opening of the U-shaped tube is upward, and the middle portion of the U-shaped tube is connected to an end of the corresponding seventh pipe away from the sixth pipe.

[0021] Preferably, it also includes a hydrogen discharge control mechanism;

[0022] The U-shaped tube comprises:

[0023] a connecting pipe, a middle portion of which is communicated with the seventh pipeline; and

[0024] Two vertically arranged installation pipes, the lower ends of the two installation pipes are respectively connected to the two ends of the connecting pipe;

[0025] A plurality of groups of hydrogen discharge holes are provided on the side wall of the installation tube; the plurality of groups of hydrogen discharge holes are distributed along the axial direction of the installation tube; each group of hydrogen discharge holes is at the same level; the hydrogen discharge control mechanism can control liquid hydrogen to be discharged from one group of hydrogen discharge holes.

[0026] Preferably, a plurality of support rods are connected to the inner wall of the lower end of the mounting tube, and the plurality of support rods are evenly distributed around the axis of the mounting tube; a coaxial first limiting ring is also connected to the inner wall of the mounting tube; the first limiting ring is located below the plurality of groups of hydrogen discharge holes on the mounting tube;

[0027] The hydrogen discharge control mechanism comprises:

[0028] A plurality of shielding tubes nested in sequence, the plurality of shielding tubes being coaxial, the lower end outer wall of each shielding tube being connected to a coaxial first retaining ring, and the upper end inner wall of each shielding tube being connected to a coaxial second limiting ring;

[0029] A second retaining ring, wherein the second retaining ring is slidably matched with the inner wall of the inner shielding tube, and the second retaining ring can move upward to abut against the second limiting ring on the inner wall of the inner shielding tube;

[0030] a connecting member connected to the second retaining ring; and

[0031] A limiting round block, wherein the limiting round block is slidably matched with the inner wall of the mounting tube, and the lower end of the limiting round block is connected to the connecting piece;

[0032] The first retaining ring on the outer layer of the plurality of shielding tubes is slidably fitted with the inner wall of the mounting tube and can be moved upward to abut against the first limiting ring, and the first retaining ring of the other shielding tubes can be moved upward to abut against the second limiting ring on the adjacent shielding tube; the plurality of support rods can support the lower ends of the plurality of shielding tubes.

[0033] Preferably, each of the seventh pipelines is provided with a control valve to control the opening and closing of the seventh pipeline.

[0034] Preferably, each group of the hydrogen discharge holes on the mounting tube includes a plurality of the hydrogen discharge holes evenly arranged along the circumference of the mounting tube.

[0035] Preferably, two adjacent groups of hydrogen discharge holes on the same mounting tube are staggered.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] In the technology of the present invention, gaseous hydrogen enters the hydrogen liquefaction device from the first pipeline, is re-liquefied, and is transported back to the bottom of the liquid hydrogen container through the liquid hydrogen circulation pump, the third pipeline and the fourth pipeline, thereby avoiding the waste of hydrogen resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0039] Figure 1 It is a process flow diagram of a lossless liquid hydrogen storage system in one embodiment of the present invention;

[0040] Figure 2A three-dimensional diagram of a liquid hydrogen container of a lossless liquid hydrogen storage system in one embodiment of the present invention;

[0041] Figure 3 for Figure 2 Schematic diagram of the internal structure of the liquid hydrogen container;

[0042] Figure 4 for Figure 3 A three-dimensional view of the middle U-tube;

[0043] Figure 5 for Figure 4 Schematic diagram of the internal structure;

[0044] Figure 6 for Figure 5 Enlarged schematic diagram of point S in the middle.

[0045] Reference numerals:

[0046] 10. Liquid hydrogen container;

[0047] 20. First pipeline; 21. Hydrogen liquefaction device; 22. Second pipeline; 23. Liquid hydrogen circulation pump; 24. Third pipeline; 25. Check valve; 26. Fourth pipeline; 27. Control valve; 28. Fifth pipeline; 29. ​​Sixth pipeline; 30. Seventh pipeline; 31. U-shaped pipe; 311. Connecting pipe; 312. Mounting pipe; 313. Hydrogen discharge hole; 32. Support rod; 33. First limiting ring;

[0048] 40. Hydrogen discharge control mechanism; 41. Shielding tube; 42. First retaining ring; 43. Second limiting ring; 44. Second retaining ring; 45. Connecting piece; 46. Limiting round block. DETAILED DESCRIPTION

[0049] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0050] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0053] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] See also Figures 1 to 6 This embodiment provides a loss-free liquid hydrogen storage system, including a liquid hydrogen container 10, a first pipeline 20, a hydrogen liquefaction device 21, a second pipeline 22, a liquid hydrogen circulation pump 23, a third pipeline 24 and a fourth pipeline 26.

[0056] One end of the first pipeline 20 is in communication with the top of the liquid hydrogen container 10. The input end of the hydrogen liquefaction device 21 is in communication with the end of the first pipeline 20 away from the liquid hydrogen container 10, and the hydrogen liquefaction device 21 is used to convert the gaseous hydrogen transported by the top first pipeline 20 into liquid hydrogen. The second pipeline 22 is in communication with the output end of the hydrogen liquefaction device 21. The input end of the liquid hydrogen circulation pump 23 is in communication with the end of the second pipeline 22 away from the hydrogen liquefaction device 21, and the liquid hydrogen circulation pump 23 is used to pump liquid hydrogen. The third pipeline 24 is in communication with the output end of the liquid hydrogen circulation pump 23, and a check valve 25 is provided on the third pipeline 24. One end of the fourth pipeline 26 is in communication with the end of the third pipeline 24 away from the liquid hydrogen circulation pump 23, and the other end of the fourth pipeline 26 is in communication with the bottom of the liquid hydrogen container 10. The first pipeline 20 and the fourth pipeline 26 are provided with a control valve 27. Specifically, the liquid hydrogen circulation pump 23 and the hydrogen liquefaction device 21 can adopt existing technologies. In addition, the second pipeline 22 can be provided with a gaseous hydrogen and liquid hydrogen separation device, and the liquid hydrogen flows into the liquid hydrogen circulation pump 23 after separation, while the gaseous hydrogen is transported back to the hydrogen liquefaction device 21 through another pipeline, so that the liquid hydrogen pumped from the liquid hydrogen circulation pump 23 to the liquid hydrogen container 10 is all liquid hydrogen.

[0057] In this embodiment, the gaseous hydrogen enters the hydrogen liquefaction device 21 from the first pipeline 20, is reliquefied, and is transported back to the bottom of the liquid hydrogen container 10 through the liquid hydrogen circulation pump 23, the third pipeline 24, and the fourth pipeline 26, thereby avoiding the waste of hydrogen resources and reducing safety risks. In addition, the reliquefied liquid hydrogen has a low temperature, which can reduce the temperature in the liquid hydrogen container 10, thereby slowing down the evaporation rate of the liquid hydrogen in the liquid hydrogen container 10.

[0058] In one embodiment, the non-loss liquid hydrogen storage system further includes a fifth pipeline 28 .

[0059] One end of the fifth pipeline 28 is communicated with one end of the third pipeline 24 away from the liquid hydrogen circulation pump 23, and the other end of the fifth pipeline 28 is communicated with the top of the liquid hydrogen container 10. A control valve 27 is provided on the fifth channel.

[0060] In this embodiment, the liquid hydrogen pumped by the liquid hydrogen circulation pump 23 can be delivered to the bottom of the liquid hydrogen container 10 from the fourth pipeline 26, or can be delivered from the top of the liquid hydrogen container 10. The liquid hydrogen input from the top of the liquid hydrogen container 10 can be merged with the liquid hydrogen inside the liquid hydrogen container 10, thereby cooling the liquid hydrogen there, and slowing down the evaporation of the liquid hydrogen.

[0061] In one embodiment, the lossless liquid hydrogen storage system further includes a sixth pipe 29 , a plurality of seventh pipes 30 and a plurality of U-shaped pipes 31 .

[0062] The sixth pipeline 29 is closed at both ends, and the sixth pipeline 29 is connected to the fourth pipeline 26. One end of the plurality of seventh pipelines 30 is simultaneously connected to the sixth pipeline 29, and the other ends of the plurality of seventh pipelines 30 are inserted into the liquid hydrogen container 10. The plurality of U-shaped tubes 31 correspond to the plurality of seventh pipelines 30 one by one, and the plurality of U-shaped tubes 31 are arranged in parallel in the liquid hydrogen container 10, the opening of the U-shaped tube 31 is upward, and the middle part of the U-shaped tube 31 is connected to the end of the corresponding seventh pipeline 30 away from the sixth pipeline 29. The fourth pipeline 26 is connected to the liquid hydrogen container 10 through the sixth channel, the seventh pipeline 30 and the U-shaped tube 31.

[0063] In this embodiment, the liquid hydrogen pumped by the liquid hydrogen circulation pump 23 is transported to the liquid hydrogen container 10 through the sixth pipeline 29, the seventh pipeline 30 and the U-shaped pipe 31. The liquid hydrogen is output from both ends of the U-shaped channel, which can cool the liquid hydrogen in the liquid hydrogen container 10 more evenly, thereby slowing down the evaporation rate of the liquid hydrogen.

[0064] In one embodiment, the non-loss liquid hydrogen storage system further includes a hydrogen discharge control mechanism 40 .

[0065] The U-shaped tube 31 includes a connecting tube 311 and two vertically arranged mounting tubes 312 .

[0066] The middle of the connecting pipe 311 is connected to the seventh pipeline 30. The lower ends of the two installation pipes 312 are respectively connected to the two ends of the connecting pipe 311. Multiple groups of hydrogen discharge holes 313 are opened on the side wall of the installation pipe 312; the multiple groups of hydrogen discharge holes 313 are distributed along the axial direction of the installation pipe 312; each group of hydrogen discharge holes 313 is at the same level; the hydrogen discharge control mechanism 40 can control the liquid hydrogen to be discharged from one group of the hydrogen discharge holes 313.

[0067] In this embodiment, the liquid hydrogen in the connecting pipe 311 is transported to the installation pipes 312 at both ends. Under the control of the hydrogen discharge control mechanism 40, the liquid hydrogen can be discharged from the hydrogen discharge holes 313 at different heights, so that the liquid hydrogen with a lower temperature in the installation pipe 312 is mixed more evenly with the liquid hydrogen in the liquid hydrogen container 10, and the liquid hydrogen in the liquid hydrogen container 10 is cooled more evenly.

[0068] In one embodiment, a plurality of support rods 32 are connected to the inner wall of the lower end of the mounting tube 312, and the plurality of support rods 32 are evenly distributed around the axis of the mounting tube 312; a coaxial first limiting ring 33 is also connected to the inner wall of the mounting tube 312; the first limiting ring 33 is located below the plurality of groups of hydrogen discharge holes 313 on the mounting tube 312.

[0069] The hydrogen discharge control mechanism 40 includes a plurality of shielding tubes 41 , a second blocking ring 44 , a connecting member 45 and a limiting round block 46 which are nested in sequence.

[0070] The plurality of shielding tubes 41 are coaxial, the lower outer wall of each shielding tube 41 is connected with a coaxial first retaining ring 42, and the upper inner wall of each shielding tube 41 is connected with a coaxial second limiting ring 43;

[0071] The second retaining ring 44 is slidably matched with the inner wall of the inner shielding tube 41 , and the second retaining ring 44 can move upward to abut against the second limiting ring 43 on the inner wall of the inner shielding tube 41 .

[0072] The connecting piece 45 is connected to the second baffle ring 44. After the connecting piece 45 and the second baffle ring 44 are connected, a space is left in the middle of the second baffle ring 44 for liquid hydrogen to pass through. The limiting circle 46 is slidably matched with the inner wall of the mounting tube 312, and the lower end of the limiting circle 46 is connected to the connecting piece 45. The first baffle ring 42 on the outer layer of the plurality of shielding tubes 41 is slidably matched with the inner wall of the mounting tube 312 and can be moved up to abut against the first limiting ring 33, and the first baffle ring 42 of the other shielding tubes 41 can be moved up to abut against the second limiting ring 43 on the adjacent shielding tube 41. The plurality of support rods 32 can support the lower ends of the plurality of shielding tubes 41;

[0073] In this embodiment, Figure 6 , the space between the limiting circular block 46 and the plurality of shielding cylinders 41 is connected to the horizontal hydrogen discharge hole 313. When the liquid hydrogen flows upward from the innermost shielding cylinder 41 and impacts the limiting circular block 46, the liquid hydrogen is discharged from the hydrogen discharge hole 313 there. Once the flow speed of the liquid hydrogen is accelerated and the pressure is increased, the limiting circular block 46 is driven to move upward, and part of the shielding cylinder 41 is driven to move upward, and the shielding cylinder 41 blocks the hydrogen discharge hole 313 on the outside. The liquid hydrogen in the shielding cylinder 41 will not be discharged from the blocked hydrogen discharge hole 313, but will be discharged from the hydrogen discharge hole 313 that is not blocked above and is located below the limiting circular block 46. This makes it possible to adjust the pressure of the liquid hydrogen in the shielding tube 41 as needed, thereby controlling the height of the limiting circle 46, so that the liquid hydrogen in the shielding tube 41 is discharged from the hydrogen discharge holes 313 at different heights, so that the lower temperature liquid hydrogen in the shielding tube 41 is mixed more evenly with the liquid hydrogen in the liquid hydrogen container 10, thereby reducing the overall temperature of the liquid hydrogen in the liquid hydrogen container 10.

[0074] In one embodiment, each of the seventh pipelines 30 is provided with a control valve 27 to control the opening and closing of the seventh pipeline 30. When the liquid hydrogen on the upper part of the liquid hydrogen container 10 needs to be cooled quickly, part of the seventh pipeline 30 is closed, and the liquid hydrogen delivered by the liquid hydrogen circulation pump 23 is discharged only from one or a few U-shaped tubes 31, thereby increasing the liquid hydrogen pressure in the U-shaped tube 31, so that the limiting round block 46 can move upward, and then the liquid hydrogen in the installation tube 312 is discharged from the hydrogen discharge hole 313 at the upper end of the installation tube 312, and the upper layer of liquid hydrogen in the liquid hydrogen container 10 is cooled.

[0075] In one embodiment, each group of the hydrogen discharge holes 313 on the mounting tube 312 includes a plurality of hydrogen discharge holes 313 evenly arranged along the circumference of the mounting tube 312 , so that the liquid hydrogen in the mounting tube 312 can be evenly mixed with the liquid hydrogen in the liquid hydrogen container 10 when discharged from the hydrogen discharge holes 313 .

[0076] In one embodiment, two adjacent groups of hydrogen discharge holes 313 on the same mounting tube 312 are staggered so that the liquid hydrogen in the mounting tube 312 can be discharged in more directions, so that the liquid hydrogen in the mounting tube 312 can be further evenly mixed with the liquid hydrogen in the liquid hydrogen container 10.

[0077] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A loss-free liquid hydrogen storage system, characterized in that: include: Liquid hydrogen container (10); a first pipeline (20), one end of which is in communication with the top of the liquid hydrogen container (10); a hydrogen liquefaction device (21), wherein an input end of the hydrogen liquefaction device (21) is connected to an end of the first pipeline (20) away from the liquid hydrogen container (10), and the hydrogen liquefaction device (21) is used to convert the gaseous hydrogen transported by the top first pipeline (20) into liquid hydrogen; a second pipeline (22), the second pipeline (22) being in communication with an output end of the hydrogen liquefaction device (21); a liquid hydrogen circulation pump (23), wherein an input end of the liquid hydrogen circulation pump (23) is connected to an end of the second pipeline (22) away from the hydrogen liquefaction device (21), and the liquid hydrogen circulation pump (23) is used to pump liquid hydrogen; a third pipeline (24), the third pipeline (24) being in communication with an output end of the liquid hydrogen circulation pump (23), and the third pipeline (24) being provided with a check valve (25); and a fourth pipeline (26), one end of the fourth pipeline (26) being in communication with an end of the third pipeline (24) away from the liquid hydrogen circulation pump (23), and the other end of the fourth pipeline (26) being in communication with the bottom of the liquid hydrogen container (10); Control valves (27) are provided on the first pipeline (20) and the fourth pipeline (26).

2. A loss-free liquid hydrogen storage system as claimed in claim 1, characterized in that: Also includes: a fifth pipeline (28), one end of the fifth pipeline (28) being in communication with an end of the third pipeline (24) away from the liquid hydrogen circulation pump (23), and the other end of the fifth pipeline (28) being in communication with the top of the liquid hydrogen container (10); The fifth channel is provided with a control valve (27).

3. A loss-free liquid hydrogen storage system as claimed in claim 1, characterized in that: Also includes: a sixth pipeline (29), the sixth pipeline (29) being closed at both ends and being in communication with the fourth pipeline (26); a plurality of seventh pipes (30), one ends of the plurality of seventh pipes (30) being simultaneously connected to the sixth pipe (29), and the other ends of the plurality of seventh pipes (30) being inserted into the liquid hydrogen container (10); and A plurality of U-shaped tubes (31), wherein the plurality of U-shaped tubes (31) correspond one to one with the plurality of seventh pipes (30), and the plurality of U-shaped tubes (31) are arranged in parallel in the liquid hydrogen container (10), the opening of the U-shaped tube (31) is upward, and the middle portion of the U-shaped tube (31) is connected to an end of the corresponding seventh pipe (30) away from the sixth pipe (29).

4. A lossless liquid hydrogen storage system as claimed in claim 3, characterized in that: Also included is a hydrogen discharge control mechanism (40); The U-shaped tube (31) comprises: a connecting pipe (311), the middle portion of which is in communication with the seventh pipeline (30); and Two vertically arranged installation pipes (312), the lower ends of the two installation pipes (312) being respectively connected to the two ends of the connecting pipe (311); A plurality of groups of hydrogen discharge holes (313) are provided on the side wall of the installation tube (312); the plurality of groups of hydrogen discharge holes (313) are distributed along the axial direction of the installation tube (312); each group of hydrogen discharge holes (313) is at the same level; and the hydrogen discharge control mechanism (40) can control liquid hydrogen to be discharged from one group of the hydrogen discharge holes (313).

5. A loss-free liquid hydrogen storage system as claimed in claim 4, characterized in that: A plurality of support rods (32) are connected to the inner wall of the lower end of the mounting tube (312), and the plurality of support rods (32) are evenly distributed around the axis of the mounting tube (312); a coaxial first limiting ring (33) is also connected to the inner wall of the mounting tube (312); the first limiting ring (33) is located below the plurality of groups of hydrogen discharge holes (313) on the mounting tube (312); The hydrogen discharge control mechanism (40) comprises: A plurality of shielding tubes (41) nested in sequence, the plurality of shielding tubes (41) being coaxial, the lower end outer wall of each shielding tube (41) being connected to a coaxial first retaining ring (42), and the upper end inner wall of each shielding tube (41) being connected to a coaxial second limiting ring (43); A second retaining ring (44), the second retaining ring (44) being slidably matched with the inner wall of the inner shielding tube (41), the second retaining ring (44) being capable of moving upwards and abutting against the second limiting ring (43) on the inner wall of the inner shielding tube (41); A connecting member (45), the connecting member (45) being connected to the second retaining ring (44); and A limiting round block (46), wherein the limiting round block (46) is slidably matched with the inner wall of the mounting tube (312), and the lower end of the limiting round block (46) is connected to the connecting piece (45); The first retaining ring (42) on the outer layer of the plurality of shielding tubes (41) is slidably matched with the inner wall of the mounting tube (312) and can be moved upward to abut against the first limiting ring (33); the first retaining ring (42) of the other shielding tubes (41) can be moved upward to abut against the second limiting ring (43) on the adjacent shielding tube (41); and the plurality of support rods (32) can support the lower ends of the plurality of shielding tubes (41).

6. A loss-free liquid hydrogen storage system as claimed in claim 5, characterized in that: Each of the seventh pipelines (30) is provided with a control valve (27) to control the opening and closing of the seventh pipeline (30).

7. A loss-free liquid hydrogen storage system as claimed in claim 6, characterized in that: Each group of hydrogen discharge holes (313) on the mounting tube (312) includes a plurality of hydrogen discharge holes (313) uniformly arranged along the circumference of the mounting tube (312).

8. A loss-free liquid hydrogen storage system as claimed in claim 7, characterized in that: Two adjacent groups of hydrogen discharge holes (313) on the same installation tube (312) are arranged in a staggered manner.

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