Liquid hydrogen pressurization system and method

Abstract

The application provides a liquid hydrogen pressurizing system, which comprises a liquid hydrogen storage tank (1), a first throttling liquid hydrogen pipeline (2), a throttle valve (3), a second throttling liquid hydrogen pipeline (4), a supercooling heat exchanger (5), a throttling hydrogen pipeline (6), a liquid hydrogen pressurizing pump (7), a high-pressure low-temperature hydrogen pipeline (9), a low-temperature high-pressure hydrogen application system (10), a hydrogen discharge pipeline (11), a hydrogen discharge system (12), a supercooling liquid hydrogen pipeline (14), a liquid hydrogen pipeline (15), a low-temperature high-pressure one-way valve (16), a discharge one-way valve (17) and a liquid hydrogen storage tank outlet on-off valve (18). A small amount of liquid hydrogen is used for throttling and cooling to supercool the saturated liquid hydrogen entering the inlet of the liquid hydrogen pressurizing pump (7) by 0.5K to 1K, so that the gas content of the liquid hydrogen entering the liquid hydrogen pressurizing pump (7) is greatly reduced, even the liquid hydrogen can be fully sucked, the piston volume efficiency of the liquid hydrogen pressurizing pump (7) is improved, and the compression power consumption is reduced. In addition, the application further provides a liquid hydrogen pressurizing method.

Description

Technical Field

[0001] This application relates to the field of refrigeration and cryogenic technology, and in particular to a liquid hydrogen pressurization system and a liquid hydrogen pressurization method. Background Technology

[0002] Liquid hydrogen is one of the important forms of hydrogen energy utilization. A liquid hydrogen refueling station is a facility that effectively utilizes liquid hydrogen to provide fuel for hydrogen fuel cell vehicles. In mature overseas processes, gaseous hydrogen is typically liquefied at 20K in a liquid hydrogen plant, transported via cryogenic pipelines to liquid hydrogen tank trucks, and then transported to the refueling station. From there, it is again transported via cryogenic pipelines to the station's liquid hydrogen storage tanks for storage. Currently, refueling stations that store liquid hydrogen for gaseous hydrogen refueling require providing hydrogen fuel cell vehicles with high-pressure gaseous hydrogen at 35 / 70MPa. Since liquid compression requires less power than gas compression, liquid hydrogen refueling stations typically use liquid hydrogen booster pumps to pressurize the liquid hydrogen in the storage tanks from 1-3 bar to the required refueling pressure. After vaporization and reheating, the hydrogen reaches the required temperature and pressure for refueling.

[0003] The liquid hydrogen booster pump used in liquid hydrogen refueling stations is a reciprocating piston pump. The liquid hydrogen at the pump inlet is usually saturated and enters the compression chamber directly through the inlet valve. The smaller cross-sectional area at the inlet valve increases the flow velocity, leading to increased dynamic pressure and decreased static pressure. Simultaneously, flow losses cause the pressure entering the compression chamber to fall below the saturation pressure, resulting in partial vaporization of the liquid hydrogen. This reduces the amount of liquid entering the compression chamber, lowering the pump's volumetric efficiency, and in severe cases, preventing the pump from drawing in liquid hydrogen altogether. Summary of the Invention

[0004] Therefore, it is necessary to provide a liquid hydrogen pressurization system and method with high pump volumetric efficiency to address the technical shortcomings of low pump volumetric efficiency in existing technologies.

[0005] To solve the above problems, this application adopts the following technical solution:

[0006] One objective of this application is to provide a liquid hydrogen pressurization system, comprising: a liquid hydrogen storage tank 1, a throttling liquid hydrogen pipeline 2, a throttling valve 3, a throttling liquid hydrogen pipeline 4, a subcooling heat exchanger 5, a throttling hydrogen pipeline 6, a liquid hydrogen booster pump 7, a high-pressure cryogenic hydrogen pipeline 9, a cryogenic high-pressure hydrogen application system 10, a hydrogen emission pipeline 11, a hydrogen emission system 12, a subcooled liquid hydrogen pipeline 14, a liquid hydrogen pipeline 15, a cryogenic high-pressure check valve 16, an emission check valve 17, and a liquid hydrogen storage tank outlet switch valve 18, wherein:

[0007] The liquid hydrogen stored in the liquid hydrogen storage tank 1 is discharged from the outlet. A portion of the liquid hydrogen enters the subcooling heat exchanger 5 through the liquid hydrogen pipeline 15 and is subcooled liquid hydrogen through heat exchange. The subcooled liquid hydrogen enters the liquid hydrogen booster pump 7 through the subcooled liquid hydrogen pipeline 14 and forms high-pressure low-temperature hydrogen in the liquid hydrogen booster pump 7. The high-pressure low-temperature hydrogen enters the low-temperature high-pressure hydrogen application system 10 through the high-pressure low-temperature hydrogen pipeline 9.

[0008] Another portion of liquid hydrogen enters the throttling valve 3 through the throttling liquid hydrogen pipeline 2 and is throttled to form low-temperature saturated gas-liquid two-phase hydrogen. The gas-liquid two-phase hydrogen enters the subcooling heat exchanger 5. When the subcooling heat exchanger 5 subcools the liquid hydrogen in the liquid hydrogen pipeline 15, the liquid phase hydrogen in the gas-liquid two-phase hydrogen absorbs heat and becomes gaseous hydrogen. After absorbing heat and rising in temperature in the subcooling heat exchanger 5, the gaseous hydrogen enters the throttling hydrogen pipeline 6, and then enters the motor cooling unit of the liquid hydrogen booster pump 7 to cool the motor. After being further heated by the motor cooling unit, the gaseous hydrogen is discharged through the hydrogen discharge pipeline 11 and enters the hydrogen discharge system 12.

[0009] In some embodiments, a booster pump cooling jacket 8 is also included, which is a cooling circuit integrated into the housing of the liquid hydrogen booster pump 7.

[0010] In some embodiments, the gaseous hydrogen absorbs heat and rises in temperature in the subcooled heat exchanger 5 before entering the throttling hydrogen pipeline 6. Subsequently, the gaseous hydrogen enters the booster pump cooling jacket 8 and further absorbs the heat generated by the compression of the liquid hydrogen booster pump 7, thus rising in temperature. It then enters the motor cooling unit of the liquid hydrogen booster pump 7 through the hydrogen pipeline 13.

[0011] In some embodiments, the liquid hydrogen storage tank 1 is a cryogenic storage tank with a vacuum multilayer insulation structure and an operating pressure in the range of 1 to 5 bar.

[0012] In some embodiments, the throttling liquid hydrogen pipeline 2, the throttling liquid hydrogen pipeline 4, the throttling hydrogen gas pipeline 6, the hydrogen gas pipeline 13, the subcooled liquid hydrogen pipeline 14, and the liquid hydrogen pipeline 15 are all cryogenic fluid transmission pipelines with a vacuum multilayer insulation structure.

[0013] In some embodiments, the vacuum multilayer insulation structure cryogenic fluid transmission pipeline is a rigid metal pipe or a flexible metal pipe, and a cryogenic connector can be installed in the middle of the vacuum multilayer insulation structure cryogenic fluid transmission pipeline as needed.

[0014] In some embodiments, the throttle valve 3 is a cryogenic throttle valve that applies the temperature of liquid hydrogen. The cryogenic throttle valve can be manual, pneumatic, or electric, and all are explosion-proof structures that meet the requirements of hydrogen environments.

[0015] In some embodiments, the subcooling heat exchanger 5 is a two-stream low-temperature heat exchanger, which can be plate-fin, shell-and-tube, or sleeve-and-tube type, and the material of the subcooling heat exchanger 5 is aluminum.

[0016] In some embodiments, the liquid hydrogen booster pump 7 is a piston-type single-stage or multi-stage reciprocating booster pump, which can boost the inlet pressure from 1 to 3 bar to various pressures below 90 MPa.

[0017] In some embodiments, the cryogenic high-pressure hydrogen application system 10 includes a high-pressure vaporizer, a high-pressure gas storage tank, and a hydrogen dispenser; the hydrogen emission pipeline 11 is a single-layer pipeline at room temperature; and the hydrogen emission system 12 is the hydrogen emission system of a liquid hydrogen refueling station.

[0018] The second objective of this application is to provide a method for pressurizing liquid hydrogen in the aforementioned liquid hydrogen pressurization system, comprising the following steps:

[0019] The liquid hydrogen stored in the liquid hydrogen storage tank 1 is discharged from the outlet. A portion of the liquid hydrogen enters the subcooling heat exchanger 5 through the liquid hydrogen pipeline 15 and is subcooled liquid hydrogen through heat exchange. The subcooled liquid hydrogen enters the liquid hydrogen booster pump 7 through the subcooled liquid hydrogen pipeline 14 and forms high-pressure low-temperature hydrogen in the liquid hydrogen booster pump 7. The high-pressure low-temperature hydrogen enters the low-temperature high-pressure hydrogen application system 10 through the high-pressure low-temperature hydrogen pipeline 9.

[0020] Another portion of liquid hydrogen enters the throttling valve 3 through the throttling liquid hydrogen pipeline 2 and is throttled to form low-temperature saturated gas-liquid two-phase hydrogen. The gas-liquid two-phase hydrogen enters the subcooling heat exchanger 5. When the subcooling heat exchanger 5 subcools the liquid hydrogen in the liquid hydrogen pipeline 15, the liquid phase hydrogen in the gas-liquid two-phase hydrogen absorbs heat and becomes gaseous hydrogen. After absorbing heat and rising in temperature in the subcooling heat exchanger 5, the gaseous hydrogen enters the throttling hydrogen pipeline 6, and then enters the motor cooling unit of the liquid hydrogen booster pump 7 to cool the motor. After being further heated by the motor cooling unit, the gaseous hydrogen is discharged through the hydrogen discharge pipeline 11 and enters the hydrogen discharge system 12.

[0021] In some embodiments, the following steps are also included:

[0022] The gaseous hydrogen absorbs heat and rises in temperature in the subcooling heat exchanger 5 before entering the throttling hydrogen pipeline 6. Subsequently, the gaseous hydrogen enters the booster pump cooling jacket 8 and further absorbs the heat generated by the compression of the liquid hydrogen booster pump 7, thus rising in temperature. It then enters the motor cooling unit of the liquid hydrogen booster pump 7 through the hydrogen pipeline 13.

[0023] The present application adopts the above technical solution, and its beneficial effects are as follows:

[0024] The liquid hydrogen boosting system and method provided in this application use a small amount of liquid hydrogen for throttling and cooling to subcool the saturated liquid hydrogen entering the inlet of the liquid hydrogen boosting pump 7 by 0.5K to 1K. This can significantly reduce the gas content in the liquid entering the liquid hydrogen boosting pump 7, or even allow it to be fully liquid-intaken, thereby improving the piston volumetric efficiency of the liquid hydrogen boosting pump 7 and reducing compression power consumption. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the liquid hydrogen pressurization system provided in Embodiment 1 of the present invention.

[0027] Figure 2 This is a schematic diagram of the liquid hydrogen pressurization system provided in Embodiment 2 of the present invention. Detailed Implementation

[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0032] Example 1

[0033] Please see Figure 1 This is a schematic diagram of the liquid hydrogen pressurization system provided in Embodiment 1, including: a liquid hydrogen storage tank 1, a throttling liquid hydrogen pipeline 2, a throttling valve 3, a throttling liquid hydrogen pipeline 4, a subcooling heat exchanger 5, a throttling hydrogen pipeline 6, a liquid hydrogen booster pump 7, a high-pressure cryogenic hydrogen pipeline 9, a cryogenic high-pressure hydrogen application system 10, a hydrogen emission pipeline 11, a hydrogen emission system 12, a subcooled liquid hydrogen pipeline 14, a liquid hydrogen pipeline 15, a cryogenic high-pressure one-way valve 16, an emission one-way valve 17, and a liquid hydrogen storage tank outlet switch valve 18. The connection relationships of each component and their implementation methods are described in detail below.

[0034] In this embodiment, the liquid hydrogen storage tank 1 is a cryogenic storage tank with a vacuum multilayer insulation structure and a working pressure in the range of 1 to 5 bar.

[0035] In this embodiment, the throttling liquid hydrogen pipeline 2, the throttling liquid hydrogen pipeline 4, the throttling hydrogen gas pipeline 6, the hydrogen gas pipeline 13, the subcooled liquid hydrogen pipeline 14, and the liquid hydrogen pipeline 15 are all cryogenic fluid transmission pipelines with a vacuum multilayer insulation structure.

[0036] In this embodiment, the throttling liquid hydrogen pipeline 2, the throttling valve 3, the throttling liquid hydrogen pipeline 4, the subcooling heat exchanger 5, the throttling hydrogen pipeline 6, and the booster pump cooling jacket 8 constitute the liquid hydrogen booster pump 7 inlet subcooling system, so that the liquid hydrogen inlet of the liquid hydrogen booster pump 7 is subcooled by 0.5K to 1K.

[0037] In this embodiment, the vacuum multilayer insulation structure cryogenic fluid transmission pipeline is a rigid metal pipe or a flexible metal pipe, and a cryogenic connector can be installed in the middle of the vacuum multilayer insulation structure cryogenic fluid transmission pipeline as needed.

[0038] In this embodiment, the throttle valve 3 is a cryogenic throttle valve that applies the temperature of liquid hydrogen. The cryogenic throttle valve can be manual, pneumatic, or electric, and all of them are explosion-proof structures that meet the requirements of hydrogen environment.

[0039] In this embodiment, the subcooling heat exchanger 5 is a two-stream low-temperature heat exchanger, which can be plate-fin, shell-and-tube, or sleeve-and-tube type, and the material of the subcooling heat exchanger 5 is aluminum.

[0040] In this embodiment, the liquid hydrogen booster pump 7 is a piston-type single-stage or multi-stage reciprocating booster pump, which can boost the inlet pressure from 1 to 3 bar to various pressures below 90 MPa.

[0041] In this embodiment, the cryogenic high-pressure hydrogen application system 10 includes a high-pressure vaporizer, a high-pressure gas storage tank, and a hydrogen dispenser. The hydrogen emission pipeline 11 is a single-layer pipeline at room temperature. The hydrogen emission system 12 is the hydrogen emission system of the liquid hydrogen refueling station.

[0042] The liquid hydrogen pressurization system provided in Embodiment 1 of this application operates as follows:

[0043] The liquid hydrogen stored in the liquid hydrogen storage tank 1 is discharged from the outlet. A portion of the liquid hydrogen enters the subcooling heat exchanger 5 through the liquid hydrogen pipeline 15 and is subcooled liquid hydrogen through heat exchange. The subcooled liquid hydrogen enters the liquid hydrogen booster pump 7 through the subcooled liquid hydrogen pipeline 14 and forms high-pressure low-temperature hydrogen in the liquid hydrogen booster pump 7. The high-pressure low-temperature hydrogen enters the low-temperature high-pressure hydrogen application system 10 through the high-pressure low-temperature hydrogen pipeline 9.

[0044] Another portion of liquid hydrogen enters the throttling valve 3 through the throttling liquid hydrogen pipeline 2 and is throttled to form low-temperature saturated gas-liquid two-phase hydrogen. The gas-liquid two-phase hydrogen enters the subcooling heat exchanger 5. When the subcooling heat exchanger 5 subcools the liquid hydrogen in the liquid hydrogen pipeline 15, the liquid phase hydrogen in the gas-liquid two-phase hydrogen absorbs heat and becomes gaseous hydrogen. After absorbing heat and rising in temperature in the subcooling heat exchanger 5, the gaseous hydrogen enters the throttling hydrogen pipeline 6, and then enters the motor cooling unit of the liquid hydrogen booster pump 7 to cool the motor. After being further heated by the motor cooling unit, the gaseous hydrogen is discharged through the hydrogen discharge pipeline 11 and enters the hydrogen discharge system 12.

[0045] The liquid hydrogen boosting system provided in Embodiment 1 of this application uses a small amount of liquid hydrogen for throttling and cooling to subcool the saturated liquid hydrogen entering the inlet of the liquid hydrogen boosting pump 7 by 0.5K to 1K. This can significantly reduce the gas content in the liquid entering the liquid hydrogen boosting pump 7, or even allow it to be fully liquid-intaken, thereby improving the piston volumetric efficiency of the liquid hydrogen boosting pump 7 and reducing compression power consumption.

[0046] Example 2

[0047] Please see Figure 2 This is a schematic diagram of the liquid hydrogen pressurization system provided in Embodiment 2 of this application, including: a liquid hydrogen storage tank 1, a throttling liquid hydrogen pipeline 2, a throttling valve 3, a throttling liquid hydrogen pipeline 4, a subcooling heat exchanger 5, a throttling hydrogen pipeline 6, a liquid hydrogen booster pump 7, a booster pump cooling jacket 8, a high-pressure cryogenic hydrogen pipeline 9, a cryogenic high-pressure hydrogen application system 10, a hydrogen emission pipeline 11, a hydrogen emission system 12, a hydrogen pipeline 13, a subcooled liquid hydrogen pipeline 14, a liquid hydrogen pipeline 15, a cryogenic high-pressure one-way valve 16, an emission one-way valve 17, and a liquid hydrogen storage tank outlet switch valve 18. The connection relationships of each component and their implementation methods are described in detail below.

[0048] The difference from Embodiment 1 is that this embodiment also includes a booster pump cooling jacket 8, which is a cooling circuit integrated into the housing of the liquid hydrogen booster pump 7. The specific implementation of other components can be found in Embodiment 1, and will not be repeated here.

[0049] The liquid hydrogen pressurization system provided in Embodiment 2 of this application operates as follows:

[0050] The liquid hydrogen stored in the liquid hydrogen storage tank 1 is discharged from the outlet. A portion of the liquid hydrogen enters the subcooling heat exchanger 5 through the liquid hydrogen pipeline 15 and is subcooled liquid hydrogen through heat exchange. The subcooled liquid hydrogen enters the liquid hydrogen booster pump 7 through the subcooled liquid hydrogen pipeline 14 and forms high-pressure low-temperature hydrogen in the liquid hydrogen booster pump 7. The high-pressure low-temperature hydrogen enters the low-temperature high-pressure hydrogen application system 10 through the high-pressure low-temperature hydrogen pipeline 9.

[0051] Another portion of liquid hydrogen enters the throttling valve 3 through the throttling liquid hydrogen pipeline 2 and forms low-temperature saturated gas-liquid two-phase hydrogen. The gas-liquid two-phase hydrogen enters the subcooling heat exchanger 5. When the subcooling heat exchanger 5 subcools the liquid hydrogen in the liquid hydrogen pipeline 15, the liquid phase hydrogen in the gas-liquid two-phase hydrogen absorbs heat and becomes gaseous hydrogen. After absorbing heat and rising in temperature in the subcooling heat exchanger 5, the gaseous hydrogen enters the throttling hydrogen pipeline 6. Subsequently, the gaseous hydrogen enters the booster pump cooling jacket 8 and further absorbs the heat generated by the compression of the liquid hydrogen booster pump 7, and then rises in temperature. It then enters the motor cooling unit of the liquid hydrogen booster pump 7 through the hydrogen pipeline 13. After being further heated by the motor cooling unit, the gaseous hydrogen is discharged through the hydrogen discharge pipeline 11 and enters the hydrogen discharge system 12.

[0052] The liquid hydrogen boosting system provided in Embodiment 2 of this application uses a small amount of liquid hydrogen for throttling and cooling, subcooling the saturated liquid hydrogen entering the inlet of the liquid hydrogen boosting pump 7 by 0.5K to 1K. This significantly reduces the gas content in the liquid entering the liquid hydrogen boosting pump 7, and may even allow for full liquid intake, thereby improving the piston volumetric efficiency of the liquid hydrogen boosting pump 7 and reducing compression power consumption. It is understood that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0053] The above are merely preferred embodiments of this application, and only specifically describe the technical principles of this application. These descriptions are only for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, as well as other specific embodiments of this application that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of this application.

Claims

1. A liquid hydrogen pressurization system, characterized in that, include: Liquid hydrogen storage tank (1), first throttling liquid hydrogen pipeline (2), throttling valve (3), second throttling liquid hydrogen pipeline (4), subcooling heat exchanger (5), throttling hydrogen pipeline (6), liquid hydrogen booster pump (7), high-pressure cryogenic hydrogen pipeline (9), cryogenic high-pressure hydrogen application system (10), hydrogen discharge pipeline (11), hydrogen discharge system (12), subcooled liquid hydrogen pipeline (14), liquid hydrogen pipeline (15), cryogenic high-pressure check valve (16), discharge check valve (17), and liquid hydrogen storage tank outlet switch valve (18), wherein: The liquid hydrogen stored in the liquid hydrogen storage tank (1) is discharged from the outlet. A portion of the liquid hydrogen enters the subcooling heat exchanger (5) through the liquid hydrogen pipeline (15) and is subcooled liquid hydrogen through heat exchange. The subcooled liquid hydrogen enters the liquid hydrogen booster pump (7) through the subcooled liquid hydrogen pipeline (14) and forms high-pressure low-temperature hydrogen in the liquid hydrogen booster pump (7). The high-pressure low-temperature hydrogen enters the low-temperature high-pressure hydrogen application system (10) through the high-pressure low-temperature hydrogen pipeline (9). Another portion of liquid hydrogen enters the throttling valve (3) through the first throttling liquid hydrogen pipeline (2) and forms low-temperature saturated gas-liquid two-phase hydrogen. The gas-liquid two-phase hydrogen enters the subcooling heat exchanger (5). When the subcooling heat exchanger (5) subcools the liquid hydrogen in the liquid hydrogen pipeline (15), the liquid phase hydrogen in the gas-liquid two-phase hydrogen absorbs heat and becomes gaseous hydrogen. After absorbing heat and rising in temperature in the subcooling heat exchanger (5), the gaseous hydrogen enters the throttling hydrogen pipeline (6) and then enters the motor cooling unit of the liquid hydrogen booster pump (7) to cool the motor. After the gaseous hydrogen is further heated by the motor cooling unit, it is discharged through the hydrogen discharge pipeline (11) into the hydrogen discharge system (12). It also includes a booster pump cooling jacket (8), which is a cooling circuit integrated into the housing of the liquid hydrogen booster pump (7). The gaseous hydrogen absorbs heat and rises in temperature in the subcooling heat exchanger (5) and then enters the throttling hydrogen pipeline (6). Subsequently, the gaseous hydrogen enters the booster pump cooling jacket (8) and further absorbs the heat generated by the compression of the liquid hydrogen booster pump (7) and rises in temperature. Then, it enters the motor cooling unit (19) of the liquid hydrogen booster pump (7) through the hydrogen pipeline (13).

2. The liquid hydrogen pressurization system as described in claim 1, characterized in that, The liquid hydrogen storage tank (1) is a cryogenic storage tank with a vacuum multilayer insulation structure and a working pressure in the range of 1 to 5 bar.

3. The liquid hydrogen pressurization system as described in claim 1, characterized in that, The first throttling liquid hydrogen pipeline (2), the second throttling liquid hydrogen pipeline (4), the throttling hydrogen pipeline (6), the hydrogen pipeline (13), the subcooled liquid hydrogen pipeline (14), and the liquid hydrogen pipeline (15) are all cryogenic fluid transmission pipelines with a vacuum multilayer insulation structure.

4. The liquid hydrogen pressurization system as described in claim 3, characterized in that, The vacuum multilayer insulation structure cryogenic fluid transmission pipeline is a rigid metal pipe or a flexible metal pipe, and a cryogenic connector can be installed in the middle of the vacuum multilayer insulation structure cryogenic fluid transmission pipeline as needed.

5. The liquid hydrogen pressurization system as described in claim 1, characterized in that, The throttle valve (3) is a cryogenic throttle valve that applies the temperature of liquid hydrogen. The cryogenic throttle valve can be manual, pneumatic or electric, and all of them are explosion-proof structures that meet the requirements of hydrogen environment.

6. The liquid hydrogen pressurization system as described in claim 1, characterized in that, The subcooling heat exchanger (5) is a two-stream low-temperature heat exchanger, which can be plate-fin, shell-and-tube, or sleeve-and-tube type, and the material of the subcooling heat exchanger (5) is aluminum.

7. The liquid hydrogen pressurization system as described in claim 1, characterized in that, The liquid hydrogen booster pump (7) is a piston-type single-stage or multi-stage reciprocating booster pump, which can boost the inlet pressure from 1 to 3 bar to various pressures below 90 MPa.

8. The liquid hydrogen pressurization system as described in claim 1, characterized in that, The low-temperature high-pressure hydrogen application system (10) includes a high-pressure vaporizer, a high-pressure gas storage tank and a hydrogen refueling machine. The hydrogen emission pipeline (11) is a single-layer pipeline at room temperature. The hydrogen emission system (12) is the hydrogen emission system of the liquid hydrogen refueling station.

9. A method for pressurizing liquid hydrogen in a liquid hydrogen pressurization system as described in claim 1, characterized in that, Includes the following steps: The liquid hydrogen stored in the liquid hydrogen storage tank (1) is discharged from the outlet. A portion of the liquid hydrogen enters the subcooling heat exchanger (5) through the liquid hydrogen pipeline (15) and is subcooled liquid hydrogen through heat exchange. The subcooled liquid hydrogen enters the liquid hydrogen booster pump (7) through the subcooled liquid hydrogen pipeline (14) and forms high-pressure low-temperature hydrogen in the liquid hydrogen booster pump (7). The high-pressure low-temperature hydrogen enters the low-temperature high-pressure hydrogen application system (10) through the high-pressure low-temperature hydrogen pipeline (9). Another portion of liquid hydrogen enters the throttling valve (3) through the first throttling liquid hydrogen pipeline (2) and forms low-temperature saturated gas-liquid two-phase hydrogen. The gas-liquid two-phase hydrogen enters the subcooling heat exchanger (5). When the subcooling heat exchanger (5) subcools the liquid hydrogen in the liquid hydrogen pipeline (15), the liquid phase hydrogen in the gas-liquid two-phase hydrogen absorbs heat and becomes gaseous hydrogen. After absorbing heat and rising in temperature in the subcooling heat exchanger (5), the gaseous hydrogen enters the throttling hydrogen pipeline (6) and then enters the motor cooling unit of the liquid hydrogen booster pump (7) to cool the motor. After being further heated by the motor cooling unit, the gaseous hydrogen is discharged through the hydrogen discharge pipeline (11) and enters the hydrogen discharge system (12).

10. The liquid hydrogen pressurization method of the liquid hydrogen pressurization system as described in claim 9, characterized in that, It also includes the following steps: The gaseous hydrogen absorbs heat and rises in temperature in the subcooling heat exchanger (5) before entering the throttling hydrogen pipeline (6). Subsequently, the gaseous hydrogen enters the booster pump cooling jacket (8) and further absorbs the heat generated by the compression of the liquid hydrogen booster pump (7) before rising in temperature. Then, it enters the motor cooling unit of the liquid hydrogen booster pump (7) through the hydrogen pipeline (13).

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