A liquid hydrogen pressurized hydrogen supply system

Abstract

The present invention discloses a liquid hydrogen pressurized hydrogen supply system, comprising: a liquid hydrogen source connected to the inlet of a double-acting liquid hydrogen booster pump via a liquid hydrogen input pipeline, a first automatic shut-off valve being provided on the liquid hydrogen input pipeline; a liquid phase outlet of the double-acting liquid hydrogen booster pump connected to the inlet of a liquid hydrogen output pipeline via an intermediate delivery pipeline, a second automatic shut-off valve being provided on the liquid hydrogen output pipeline, an inlet of a reflux precooling pipeline connected to both the intermediate delivery pipeline and the liquid hydrogen output pipeline, and an outlet of the reflux precooling pipeline communicating with the inlet of the double-acting liquid hydrogen booster pump; a gas phase outlet of the double-acting liquid hydrogen booster pump connected to the inlet of a first gas hydrogen output pipeline with a third automatic shut-off valve, the outlet of the first gas hydrogen output pipeline connected to the inlet of a first double-tube heat exchanger tube side, the outlet of the first double-tube heat exchanger tube side connected to the inlet of a second gas hydrogen output pipeline, the outlet of the second gas hydrogen output pipeline connected to the inlet of a third gas hydrogen output pipeline, and a fourth automatic shut-off valve being provided on the second gas hydrogen output pipeline. The present invention has the advantage of good energy saving effect.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid hydrogen and gaseous hydrogen supply, and in particular to a liquid hydrogen pressurized hydrogen supply system. Background Art

[0002] In a liquid hydrogen booster supply system, the liquid hydrogen in the liquid hydrogen source is generally pressurized by a liquid hydrogen booster pump and then supplied to the liquid terminal through a liquid hydrogen transmission pipeline. Before the liquid hydrogen booster supply system is pressurized, the entire system (including the liquid hydrogen transmission pipeline and the liquid hydrogen booster pump) must be pre-cooled and cooled using liquid hydrogen. After the pre-cooling is completed, the liquid hydrogen booster pump is used to pressurize and supply the liquid hydrogen to the liquid terminal. The currently used liquid hydrogen booster supply system has the following disadvantages: (1) Liquid hydrogen will produce a large amount of gaseous hydrogen during the pre-cooling and pressurization process. The usual way to deal with gaseous hydrogen is to return the gaseous hydrogen to the liquid hydrogen source or discharge it directly through a vent pipe. Since the gaseous hydrogen brings in heat when returning to the liquid hydrogen source, it is not only not conducive to the storage of liquid hydrogen, but also easily causes the risk of overpressure in the storage tank; and the direct discharge of gaseous hydrogen causes energy waste; (2) The transmission unit of the liquid hydrogen booster pump generates a large amount of heat energy when working. Currently, this part of the heat energy is directly diffused into the atmosphere, resulting in energy waste. Summary of the Invention

[0003] The purpose of the present invention is to provide a liquid hydrogen pressurized hydrogen supply system which is energy-saving and has high operational stability.

[0004] To achieve the above-mentioned object, the present invention adopts the following technical solutions: a liquid hydrogen pressurized hydrogen supply system, comprising a liquid hydrogen source, a double-acting liquid hydrogen booster pump, a reflux precooling pipeline, a liquid hydrogen input pipeline, and a liquid hydrogen output pipeline;

[0005] The liquid hydrogen source is connected to the inlet of the double-acting liquid hydrogen booster pump through a liquid hydrogen input pipeline, and a first automatic shut-off valve, a first one-way valve, a first flow sensor and a first temperature sensor are provided on the liquid hydrogen input pipeline;

[0006] The liquid phase outlet of the double-acting liquid hydrogen booster pump is connected to the inlet of the intermediate delivery pipeline, the outlet of the intermediate delivery pipeline is connected to the inlet of the liquid hydrogen output pipeline, the outlet of the liquid hydrogen output pipeline is used to connect to the liquid terminal, a second automatic shut-off valve is provided on the liquid hydrogen output pipeline, a second temperature sensor is provided on the liquid hydrogen output pipeline before the second automatic shut-off valve, and a third temperature sensor and a second flow sensor are provided on the liquid hydrogen output pipeline after the second automatic shut-off valve;

[0007] The inlet of the reflux precooling pipeline is connected to the outlet of the intermediate delivery pipeline and the inlet of the liquid hydrogen output pipeline. The outlet of the reflux precooling pipeline is connected to the inlet of the double-acting liquid hydrogen booster pump. A second one-way valve and a first automatic regulating valve are provided on the reflux precooling pipeline.

[0008] The gas phase outlet of the double-acting liquid hydrogen booster pump is connected to the inlet of the first gas-hydrogen output pipeline, a third automatic shut-off valve is provided on the first gas-hydrogen output pipeline, the outlet of the first gas-hydrogen output pipeline is connected to the tube-side inlet of the first double-tube heat exchanger, the tube-side outlet of the first double-tube heat exchanger is connected to the inlet of the second gas-hydrogen output pipeline, the outlet of the second gas-hydrogen output pipeline is connected to the inlet of the third gas-hydrogen output pipeline, the outlet of the third gas-hydrogen output pipeline is used to connect to the gas terminal, a fourth automatic shut-off valve is provided on the second gas-hydrogen output pipeline, and a fourth temperature sensor is provided on the third gas-hydrogen output pipeline;

[0009] A first heat transfer and insulation pipeline is coated on the outside of the transmission unit of the double-acting liquid hydrogen booster pump, one end of the first heat transfer and insulation pipeline is connected to the tube side inlet of the second shell and tube heat exchanger, and the other end of the first heat transfer and insulation pipeline is connected to the tube side outlet of the second shell and tube heat exchanger through the first delivery pump. The first heat transfer and insulation pipeline, the tube side of the second shell and tube heat exchanger and the first delivery pump form a closed first heat exchange circuit, and heat exchange medium flows in the first heat exchange circuit; the shell side outlet of the second shell and tube heat exchanger is connected to the shell side inlet of the first shell and tube heat exchanger through the second delivery pump, and the shell side outlet of the first shell and tube heat exchanger is connected to the shell side inlet of the second shell and tube heat exchanger. The shell side of the first shell and tube heat exchanger, the shell side of the second shell and tube heat exchanger and the second delivery pump form a closed second heat exchange circuit, and heat exchange medium flows in the second heat exchange circuit.

[0010] Furthermore, in the aforementioned liquid hydrogen pressurized hydrogen supply system, the inlet of the fourth gas hydrogen output pipeline is connected to the tube outlet of the first shell and tube heat exchanger, the outlet of the fourth gas hydrogen output pipeline is connected to the inlet of the third gas hydrogen output pipeline, and a fifth automatic shut-off valve, an air-temperature heat exchanger and a sixth automatic shut-off valve are sequentially arranged on the fourth gas hydrogen output pipeline along the gas hydrogen transportation direction.

[0011] Furthermore, in the aforementioned liquid hydrogen pressurized hydrogen supply system, a first pressure sensor is provided on the liquid hydrogen input pipeline.

[0012] Furthermore, in the aforementioned liquid hydrogen pressurized hydrogen supply system, a second pressure sensor is provided on the liquid hydrogen output pipeline before the second automatic shut-off valve.

[0013] Furthermore, in the aforementioned liquid hydrogen pressurized hydrogen supply system, a third pressure sensor is provided on the liquid hydrogen output pipeline after the second automatic shut-off valve.

[0014] Through the implementation of the above technical solutions, the beneficial effects of the present invention are: (1) it can effectively recycle and utilize the gaseous hydrogen generated during the pre-cooling and pressurization of liquid hydrogen, and supply the gaseous hydrogen to the gas-using terminal after pressurizing and heating, and no longer return the gaseous hydrogen to the liquid hydrogen source or discharge it directly, which not only reduces energy waste, but also prevents overpressure of the storage tank, and improves the overall stability and safety of the system; (2) it can effectively recycle and utilize the large amount of heat energy generated by the transmission unit of the liquid hydrogen booster pump during operation, and use this part of the heat to heat the gaseous hydrogen generated during the pre-cooling and pressurization of liquid hydrogen, so that the gaseous hydrogen temperature can reach the use requirements of the gas-using terminal more quickly, further reducing energy waste and achieving good energy-saving effects; (3) during the pressurization process, the liquid hydrogen flow rate can be adjusted in real time to avoid the liquid hydrogen flow rate supplied to the liquid-using terminal exceeding the preset safety value, thereby improving the stability and safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structural principle of a liquid hydrogen pressurized hydrogen supply system described in the present invention. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, the liquid hydrogen pressurized hydrogen supply system comprises a liquid hydrogen source 1, a double-acting liquid hydrogen booster pump 2, a reflux precooling pipeline 3, a liquid hydrogen input pipeline 4, and a liquid hydrogen output pipeline 5;

[0018] The liquid hydrogen source 1 is connected to the inlet of the double-acting liquid hydrogen booster pump 2 through a liquid hydrogen input pipeline 4. A first automatic shut-off valve 6, a first one-way valve 7, a first flow sensor 8, a first pressure sensor 9 and a first temperature sensor 10 are provided on the liquid hydrogen input pipeline 4. The first one-way valve 7 only allows the liquid hydrogen in the liquid hydrogen input pipeline 4 to flow from the liquid hydrogen source 1 to the double-acting liquid hydrogen booster pump 2.

[0019] The liquid phase outlet of the double-acting liquid hydrogen booster pump 2 is connected to the inlet of the intermediate delivery pipeline 11, the outlet of the intermediate delivery pipeline 11 is connected to the inlet of the liquid hydrogen output pipeline 5, the outlet of the liquid hydrogen output pipeline 5 is used to connect to the liquid terminal 12, a second automatic shut-off valve 13 is provided on the liquid hydrogen output pipeline 5, a second pressure sensor 14 and a second temperature sensor 15 are provided on the liquid hydrogen output pipeline 5 before the second automatic shut-off valve 13, and a third pressure sensor 16, a third temperature sensor 17 and a second flow sensor 18 are provided on the liquid hydrogen output pipeline 5 after the second automatic shut-off valve 13;

[0020] The inlet of the reflux precooling pipeline 3 is connected to the outlet of the intermediate delivery pipeline 11 and the inlet of the liquid hydrogen output pipeline 5. The outlet of the reflux precooling pipeline 3 is connected to the inlet of the double-acting liquid hydrogen booster pump 2. A second one-way valve 19 and a first automatic regulating valve 20 are provided on the reflux precooling pipeline 3. The second one-way valve only allows the liquid hydrogen in the reflux precooling pipeline 3 to flow from the inlet of the reflux precooling pipeline 3 to the outlet of the reflux precooling pipeline 3.

[0021] The gas phase outlet of the double-acting liquid hydrogen booster pump 2 is connected to the inlet of the first gas-hydrogen output pipeline 21. A third automatic shut-off valve 22 is provided on the first gas-hydrogen output pipeline 21. The outlet of the first gas-hydrogen output pipeline 21 is connected to the tube-side inlet of the first double-tube heat exchanger 23. The tube-side outlet of the first double-tube heat exchanger 23 is connected to the inlet of the second gas-hydrogen output pipeline 24. The outlet of the second gas-hydrogen output pipeline 24 is connected to the inlet of the third gas-hydrogen output pipeline 25. The outlet of the third gas-hydrogen output pipeline 25 is used to connect to the gas terminal 26. A fourth automatic shut-off valve 27 is provided on the second gas-hydrogen output pipeline 24. A fourth temperature sensor 28 is provided on the third gas-hydrogen output pipeline 25.

[0022] The outside of the transmission unit 201 of the double-acting liquid hydrogen booster pump 2 is coated with a first heat transfer and insulation pipeline 29, one end of the first heat transfer and insulation pipeline 29 is connected to the tube side inlet of the second shell and tube heat exchanger 30, and the other end of the first heat transfer and insulation pipeline 29 is connected to the tube side outlet of the second shell and tube heat exchanger 30 through the first delivery pump 31. The first heat transfer and insulation pipeline 29, the second shell and tube heat exchanger tube side and the first delivery pump 31 form a closed first heat exchange circuit, and heat exchange medium flows in the first heat exchange circuit; the shell side outlet of the second shell and tube heat exchanger 30 is connected to the shell side inlet of the first shell and tube heat exchanger 23 through the second delivery pump 32, and the shell side outlet of the first shell and tube heat exchanger 23 is connected to the shell side inlet of the second shell and tube heat exchanger 30. The shell side of the first shell and tube heat exchanger, the shell side of the second shell and tube heat exchanger and the second delivery pump 32 form a closed second heat exchange circuit, and heat exchange medium flows in the second heat exchange circuit.

[0023] In this embodiment, the inlet of the fourth gas-hydrogen output pipeline 33 is connected to the tube outlet of the first double-tube heat exchanger 23, and the outlet of the fourth gas-hydrogen output pipeline 33 is connected to the inlet of the third gas-hydrogen output pipeline 25. A fifth automatic shut-off valve 34, an air-temperature heat exchanger 35, and a sixth automatic shut-off valve 36 are sequentially provided on the fourth gas-hydrogen output pipeline 33 along the gas-hydrogen delivery direction. This can better regulate the temperature of the gas-hydrogen, make it more convenient to use, and further improve the overall stability and safety of the system.

[0024] In this practical application, each valve and sensor is controlled by the control center;

[0025] The working process of this system mainly includes pre-cooling process, pressurization process, liquid hydrogen pressurization flow adjustment process, and double-acting liquid hydrogen booster pump heat utilization process. The working principle of each process is explained one by one below:

[0026] The pre-cooling process works as follows:

[0027] Open the first automatic shut-off valve 6, the first automatic regulating valve 20, the third automatic shut-off valve 22, and the fourth automatic shut-off valve 27, and close the second automatic shut-off valve 13, the fifth automatic shut-off valve 34, and the sixth automatic shut-off valve 36; then start the double-acting liquid hydrogen booster pump 2. At this time, the liquid hydrogen in the liquid hydrogen source 1 first enters the double-acting liquid hydrogen booster pump 2 along the liquid hydrogen input pipeline 4. During the flow of liquid hydrogen along the liquid hydrogen input pipeline 4, a small part of the liquid hydrogen will continuously vaporize into low-temperature gaseous hydrogen. After the liquid hydrogen and low-temperature gaseous hydrogen enter the double-acting liquid hydrogen booster pump 2, the double-acting liquid hydrogen booster pump 2 will pressurize the liquid hydrogen and output it from its liquid phase outlet, and at the same time pressurize the low-temperature gaseous hydrogen and output it from its gas phase outlet; from the double-acting liquid The liquid hydrogen output from the liquid phase outlet of the hydrogen booster pump 2 enters the reflux precooling pipeline 3 through the intermediate transmission pipeline 11, and then enters the double-acting liquid hydrogen booster pump 2 through the reflux precooling pipeline 3, thereby precooling the liquid hydrogen input pipeline 4, the liquid hydrogen output pipeline 5, and the double-acting liquid hydrogen booster pump 2 through direct or indirect cold transfer; the liquid hydrogen will continue to evaporate during the precooling process to produce new low-temperature gaseous hydrogen. After the produced low-temperature gaseous hydrogen enters the double-acting liquid hydrogen booster pump 2 together with the liquid hydrogen, the double-acting liquid hydrogen booster pump 2 will pressurize the gaseous hydrogen and output it from its gas phase outlet to the first gaseous hydrogen output pipeline 21, and then enter the second gaseous hydrogen output pipeline 24 after being heated by the first shell and tube heat exchanger 23, and then enter the third gaseous hydrogen output pipeline 25. The pipeline 25 is transported to the gas terminal 26; and in the pre-cooling process, the control center will collect the temperatures fed back by the first temperature sensor 10, the second temperature sensor 15, the third temperature sensor 17, and the fourth temperature sensor 28 in real time. When the control center judges that the gas hydrogen temperature does not meet the use requirements of the gas terminal 26 through the temperature fed back by the fourth temperature sensor 28, the fifth automatic shut-off valve 34 and the sixth automatic shut-off valve 36 are opened, and the fourth automatic shut-off valve 27 is closed. At this time, the gas hydrogen heated by the first shell and tube heat exchanger 23 will enter the third gas hydrogen output pipeline 25 along the fourth gas hydrogen output pipeline 33. When the gas hydrogen passes through the fourth gas hydrogen output pipeline 33, During the process, the air-temperature heat exchanger 35 on the fourth gas-hydrogen output pipeline 33 will further heat the gas-hydrogen, and after heating the gas-hydrogen to meet the usage requirements of the gas-using terminal 26, it will be output to the third gas-hydrogen output pipeline 25. The third gas-hydrogen output pipeline 25 will then output the gas-hydrogen that meets the usage requirements of the gas-using terminal 26 to the gas-using terminal; when the control center determines through the temperature feedback of the first temperature sensor 10, the second temperature sensor 15, and the third temperature sensor 17 that the liquid hydrogen input pipeline 4, the liquid hydrogen output pipeline 5, and the double-acting liquid hydrogen booster pump 2 have reached the pre-cooling temperature set value, the pre-cooling of the liquid hydrogen input pipeline 4, the liquid hydrogen output pipeline 5, and the double-acting liquid hydrogen booster pump 2 is completed;

[0028] The supercharging process works as follows:

[0029] After the pre-cooling process is completed, the first automatic shut-off valve 6, the second automatic shut-off valve 13, the third automatic shut-off valve 22, and the fourth automatic shut-off valve 27 are opened, and the first automatic regulating valve 20, the fifth automatic shut-off valve 34 and the sixth automatic shut-off valve 36 are closed; then the double-acting liquid hydrogen booster pump 2 is started. At this time, the liquid hydrogen in the liquid hydrogen source 1 will enter the double-acting liquid hydrogen booster pump 2 along the liquid hydrogen input pipeline 4. During the flow of liquid hydrogen along the liquid hydrogen input pipeline 4, a small part of the liquid hydrogen will continuously vaporize into low-temperature gaseous hydrogen. After the liquid hydrogen and low-temperature gaseous hydrogen enter the double-acting liquid hydrogen booster pump 2, the double-acting liquid hydrogen booster pump 2 will pressurize the liquid hydrogen and output it from its liquid phase outlet to the intermediate transmission pipeline 11, and at the same time, pressurize the low-temperature gaseous hydrogen and output it from its gas phase outlet to the first gas hydrogen output pipeline 21, and then heat it through the first shell and tube heat exchanger 23 and input it into the second gas hydrogen output pipeline 24, and then transport it to the gas terminal 26 through the third gas hydrogen output pipeline 25; and during the pressurization process, The control center will collect the temperatures fed back by the first temperature sensor 10, the second temperature sensor 15, the third temperature sensor 17, and the fourth temperature sensor 28 in real time. When the control center determines that the gas hydrogen temperature does not meet the usage requirements of the gas terminal 26 based on the temperature fed back by the fourth temperature sensor 28, the fifth automatic shut-off valve 34 and the sixth automatic shut-off valve 36 are opened, and the fourth automatic shut-off valve 27 is closed. At this time, the gas hydrogen heated by the first shell and tube heat exchanger 23 will enter the third gas hydrogen output pipeline 25 along the fourth gas hydrogen output pipeline 33. In the process of the gas hydrogen passing through the fourth gas hydrogen output pipeline 33, the air-temperature heat exchanger 35 on the fourth gas hydrogen output pipeline 33 will further heat the gas hydrogen. After the gas hydrogen is heated to meet the usage requirements of the gas terminal 26, it is output to the third gas hydrogen output pipeline 25. The third gas hydrogen output pipeline 25 then outputs the gas hydrogen that meets the usage requirements of the gas terminal 26 to the gas terminal.

[0030] The working principle of the liquid hydrogen boost flow regulation process is as follows:

[0031] During the liquid hydrogen pressurization process, the control center will collect the flow rates fed back by the first flow sensor 8 and the second flow sensor 18 in real time, monitor the flow rate of the liquid hydrogen input pipeline 4 through the first flow sensor 8, and monitor the flow rate of the liquid hydrogen output pipeline 5 through the second flow sensor 18. When the control center determines that the flow rate of the liquid hydrogen output pipeline 5 has reached the flow rate setting value, it will open the first automatic regulating valve 20. At this time, part of the liquid hydrogen pressurized and output by the double-acting liquid hydrogen booster pump 2 will be input into the liquid hydrogen output pipeline 5 through the intermediate transmission pipeline 11, and the other part will flow back to the inlet of the double-acting liquid hydrogen booster pump 2 through the reflux precooling pipeline 3. The size of the liquid hydrogen reflux amount can be adjusted by the first automatic regulating valve 20, thereby completing the regulation of the liquid hydrogen flow rate;

[0032] The working principle of the heat utilization process of the double-acting liquid hydrogen booster pump is as follows:

[0033] During the pre-cooling process, the pressurization process, and the liquid hydrogen pressurization flow rate regulation process, the first delivery pump 31 will continuously flow the heat exchange medium in the first heat exchange circuit through the transmission unit 201 of the double-acting liquid hydrogen booster pump 2, thereby taking away the heat energy generated during the operation of the transmission unit 201 of the double-acting liquid hydrogen booster pump 2 and transferring the heat to the heat exchange medium in the shell side of the second shell-tube heat exchanger 30. Then the second delivery pump 32 will continuously flow the heat exchange medium in the shell side of the second shell-tube heat exchanger 30 along the second heat exchange circuit through the shell side of the first shell-tube heat exchanger 23. At this time, The heat exchange medium entering the shell side of the first shell and tube heat exchanger 23 will transfer heat to the low-temperature gaseous hydrogen flowing through the tube side of the first shell and tube heat exchanger through the tube side of the first shell and tube heat exchanger, thereby utilizing the heat energy generated during the operation of the transmission unit 201 of the double-acting liquid hydrogen booster pump 2 to heat the gaseous hydrogen, reducing energy waste. In addition, through the secondary heat exchange structure, the transmission unit 201 of the double-acting liquid hydrogen booster pump 2 can also be prevented from directly contacting the low-temperature hydrogen, thereby preventing the transmission unit 201 of the double-acting liquid hydrogen booster pump 2 from freezing due to overcooling, thereby further improving the stability and safety of use.

[0034] The advantages of the present invention are: (1) it can effectively recycle and utilize the gaseous hydrogen generated during pre-cooling and pressurization of liquid hydrogen, and supply the gaseous hydrogen to the gas-using terminal after pressurizing and heating, and no longer return the gaseous hydrogen to the liquid hydrogen source or discharge it directly, which not only reduces energy waste, but also prevents overpressure of the storage tank, thereby improving the overall stability and safety of the system; (2) it can effectively recycle and utilize the large amount of heat energy generated by the transmission unit of the liquid hydrogen booster pump during operation, and use this part of the heat to heat the gaseous hydrogen generated during pre-cooling and pressurization of liquid hydrogen, so that the temperature of the gaseous hydrogen can reach the use requirements of the gas-using terminal more quickly, further reducing energy waste and achieving good energy-saving effects; (3) during the pressurization process, the liquid hydrogen flow rate can be adjusted in real time to avoid the liquid hydrogen flow rate supplied to the liquid-using terminal exceeding the preset safety value, thereby improving the stability and safety of the system.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any modification or equivalent change made according to the technical essence of the present invention shall still fall within the scope of protection required by the present invention.

Claims

1. A liquid hydrogen pressurized hydrogen supply system, characterized by: Including liquid hydrogen source, double-acting liquid hydrogen booster pump, reflux pre-cooling pipeline, liquid hydrogen input pipeline, liquid hydrogen output pipeline; The liquid hydrogen source is connected to the inlet of the double-acting liquid hydrogen booster pump through a liquid hydrogen input pipeline, and a first automatic shut-off valve, a first one-way valve, a first flow sensor and a first temperature sensor are provided on the liquid hydrogen input pipeline; The liquid phase outlet of the double-acting liquid hydrogen booster pump is connected to the inlet of the intermediate delivery pipeline, the outlet of the intermediate delivery pipeline is connected to the inlet of the liquid hydrogen output pipeline, the outlet of the liquid hydrogen output pipeline is used to connect to the liquid terminal, a second automatic shut-off valve is provided on the liquid hydrogen output pipeline, a second temperature sensor is provided on the liquid hydrogen output pipeline before the second automatic shut-off valve, and a third temperature sensor and a second flow sensor are provided on the liquid hydrogen output pipeline after the second automatic shut-off valve; The inlet of the reflux precooling pipeline is connected to the outlet of the intermediate delivery pipeline and the inlet of the liquid hydrogen output pipeline. The outlet of the reflux precooling pipeline is connected to the inlet of the double-acting liquid hydrogen booster pump. A second one-way valve and a first automatic regulating valve are provided on the reflux precooling pipeline. The gas phase outlet of the double-acting liquid hydrogen booster pump is connected to the inlet of the first gas-hydrogen output pipeline, a third automatic shut-off valve is provided on the first gas-hydrogen output pipeline, the outlet of the first gas-hydrogen output pipeline is connected to the tube-side inlet of the first double-tube heat exchanger, the tube-side outlet of the first double-tube heat exchanger is connected to the inlet of the second gas-hydrogen output pipeline, the outlet of the second gas-hydrogen output pipeline is connected to the inlet of the third gas-hydrogen output pipeline, the outlet of the third gas-hydrogen output pipeline is used to connect to the gas terminal, a fourth automatic shut-off valve is provided on the second gas-hydrogen output pipeline, and a fourth temperature sensor is provided on the third gas-hydrogen output pipeline; A first heat transfer and insulation pipeline is coated on the outside of the transmission unit of the double-acting liquid hydrogen booster pump, one end of the first heat transfer and insulation pipeline is connected to the tube side inlet of the second shell and tube heat exchanger, and the other end of the first heat transfer and insulation pipeline is connected to the tube side outlet of the second shell and tube heat exchanger through the first delivery pump. The first heat transfer and insulation pipeline, the tube side of the second shell and tube heat exchanger and the first delivery pump form a closed first heat exchange circuit, and heat exchange medium flows in the first heat exchange circuit; the shell side outlet of the second shell and tube heat exchanger is connected to the shell side inlet of the first shell and tube heat exchanger through the second delivery pump, and the shell side outlet of the first shell and tube heat exchanger is connected to the shell side inlet of the second shell and tube heat exchanger. The shell side of the first shell and tube heat exchanger, the shell side of the second shell and tube heat exchanger and the second delivery pump form a closed second heat exchange circuit, and heat exchange medium flows in the second heat exchange circuit.

2. A liquid hydrogen pressurized hydrogen supply system according to claim 1, characterized in that: The inlet of the fourth gas-hydrogen output pipeline is connected to the tube outlet of the first shell-and-tube heat exchanger, and the outlet of the fourth gas-hydrogen output pipeline is connected to the inlet of the third gas-hydrogen output pipeline. A fifth automatic shut-off valve, an air-temperature heat exchanger and a sixth automatic shut-off valve are sequentially arranged on the fourth gas-hydrogen output pipeline along the gas-hydrogen transmission direction.

3. A liquid hydrogen pressurized hydrogen supply system according to claim 1, characterized in that: A first pressure sensor is provided on the liquid hydrogen input pipeline.

4. A liquid hydrogen pressurized hydrogen supply system according to claim 1, characterized in that: A second pressure sensor is provided on the liquid hydrogen output pipeline in front of the second automatic shut-off valve.

5. The liquid hydrogen pressurized hydrogen supply system according to claim 1, characterized in that: A third pressure sensor is provided on the liquid hydrogen output pipeline after the second automatic shut-off valve.

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