An offshore platform hydrogen liquefier and method of use thereof

Abstract

The application discloses a kind of offshore platform hydrogen liquefaction device, comprising: liquid hydrogen container, hydrogen liquefaction unit, gas inlet unit, gas source regulating unit, power supply unit, hydrogen storage unit;External hydrogen is connected to gas inlet unit;Gas inlet unit supplies external hydrogen to gas source regulating unit;Gas source regulating unit distributes hydrogen to hydrogen liquefaction unit, power supply unit, hydrogen storage unit according to distribution setting;Hydrogen storage unit supplies stored hydrogen to hydrogen liquefaction unit and / or power supply unit according to control signal;Hydrogen liquefaction unit liquefies received hydrogen and stores into liquid hydrogen container;Power supply unit converts received hydrogen into electrical energy and supplies each electrical equipment in hydrogen liquefaction unit.The application does not need additional energy, directly uses hydrogen generated by offshore wind energy, photovoltaic hydrogen production site etc., and uses power supply unit as the energy source of each electrical equipment in the device, which is not only convenient to collect, but also environmentally friendly.

Description

Technical Field

[0001] This invention relates to the field of hydrogen liquefaction technology, specifically to a hydrogen liquefaction device for an offshore platform and its usage method. Background Technology

[0002] Currently, my country's utilization of wind and solar energy has extended to the deep sea, but the utilization of deep sea energy faces problems such as long distances and difficulties in energy storage and transportation.

[0003] One current solution to this problem is to produce hydrogen using solar and wind power, and then store and transport it. Hydrogen is environmentally friendly and has high energy density, and has been accepted globally as a clean energy carrier, making it one of the most promising clean energy sources today.

[0004] Studies have shown that liquid hydrogen has a greater cost advantage than gaseous hydrogen for long-distance transportation.

[0005] Currently, research on fluctuating gas sources and effective energy supply methods for hydrogen liquefaction processes has not been considered in hydrogen liquefaction processes. Patent document CN108562111A discloses a hydrogen liquefaction system based on dual-loop circulating hydrogen refrigeration, using hydrogen as a refrigerant for cyclic refrigeration during the hydrogen liquefaction process. Although this system does not require additional refrigerant or phase change refrigeration, reducing energy consumption and increasing efficiency, its own power demand relies on a continuous external supply, making it suitable only for terrestrial environments and not for deep-sea environments. Furthermore, in terrestrial environments, the hydrogen supply is relatively stable, while in deep-sea environments, sea conditions and weather conditions can affect the amount of hydrogen produced, leading to unstable hydrogen supply and preventing the liquefaction process from reaching its optimal state. Summary of the Invention

[0006] This invention provides a hydrogen liquefaction device for offshore platforms and its usage method to solve the problems in the prior art, especially the problems of fluctuation in the hydrogen intake of offshore hydrogen liquefaction devices and the power supply source of hydrogen liquefaction devices.

[0007] The present invention provides a hydrogen liquefaction device for an offshore platform, comprising: an air intake unit, an air source regulation unit, a power supply unit, a hydrogen storage unit, a hydrogen liquefaction unit, and a liquid hydrogen container;

[0008] Externally generated hydrogen is fed into the intake unit; the intake unit supplies the externally generated hydrogen to the gas source regulating unit; the gas source regulating unit distributes the hydrogen to the hydrogen liquefaction unit, the power supply unit, and the hydrogen storage unit according to the distribution settings; the hydrogen storage unit supplies the stored hydrogen to the hydrogen liquefaction unit and / or the power supply unit according to the control signal; the hydrogen liquefaction unit liquefies the received hydrogen and stores it in a liquid hydrogen container; the power supply unit converts the received hydrogen into electrical energy to supply the electrical equipment in the hydrogen liquefaction unit.

[0009] Furthermore, the gas source regulating unit includes: a hydrogen separator and a separator control console;

[0010] The generated hydrogen gas is fed into the inlet of the hydrogen separator through the inlet unit; the separator control console is connected to the controlled end of the hydrogen separator to control the gas output status of the hydrogen separator; the first outlet of the hydrogen separator is connected to the inlet pipeline of the hydrogen liquefaction unit; the second outlet of the hydrogen separator is connected to the inlet pipeline of the hydrogen storage unit; and the third outlet of the hydrogen separator is connected to the inlet pipeline of the power supply unit.

[0011] Furthermore, the hydrogen storage unit includes: a slow-release tank, a first one-way regulating valve, a second one-way regulating valve, a first flow control valve, and a second flow control valve;

[0012] One end of the first one-way regulating valve serves as the inlet of the hydrogen storage unit, and the other end is connected to the inlet pipeline of the slow-release tank; the outlet of the slow-release tank is connected to one end of the pipeline of the second one-way regulating valve; the other end of the second one-way regulating valve is connected to one end of the pipeline of the first flow control valve and one end of the pipeline of the second flow control valve respectively; the other end of the first flow control valve is connected to the inlet pipeline of the hydrogen liquefaction unit; the other end of the second flow control valve is connected to the inlet pipeline of the power supply unit.

[0013] Furthermore, the air intake unit includes: a third gas mixer; the generated hydrogen gas is connected to one air intake port of the third gas mixer; the volatile gas outlet of the liquid hydrogen container is connected to another air intake port of the third gas mixer; and the outlet of the third gas mixer is connected to the air intake pipe of the gas source regulating unit.

[0014] Furthermore, the intake unit also includes: a heat exchanger; the generated hydrogen gas is connected to the heat medium inlet of the heat exchanger, and the heat medium outlet of the heat exchanger is connected to one of the intake pipes of the third gas mixer; the volatile gas outlet of the liquid hydrogen container is connected to the refrigerant inlet of the heat exchanger, and the refrigerant outlet of the heat exchanger is connected to another intake pipe of the third gas mixer.

[0015] Furthermore, the hydrogen liquefaction unit includes: a first gas mixer, a hydrogen compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger, a helium compressor, a helium expander, a JT valve, and a neutral hydrogen catalyst.

[0016] One outlet of the gas source regulating unit is connected to one inlet pipe of the first gas mixer; one outlet of the hydrogen storage unit is connected to another inlet pipe of the first gas mixer; the outlet of the first gas mixer is connected to the inlet pipe of the hydrogen compressor; the outlet of the hydrogen compressor, the heat medium pipe of the first heat exchanger, one heat medium pipe of the fourth heat exchanger, the positive hydrogen catalyst, one heat medium pipe of the fifth heat exchanger, the JT valve, and the inlet of the liquid hydrogen container are connected end to end in sequence to form a passage; the refrigerant pipe of the first heat exchanger... The refrigerant pipeline of the first heat exchanger, the refrigerant pipeline of the second heat exchanger, and the heat medium pipeline of the third heat exchanger are connected end to end in sequence to form a loop; the outlet of the helium compressor, the other heat medium pipeline of the third heat exchanger, the heat medium pipeline of the second heat exchanger, the other heat medium pipeline of the fourth heat exchanger, the other heat medium pipeline of the fifth heat exchanger, the inlet of the helium expander, the outlet of the helium expander, the refrigerant pipeline of the fifth heat exchanger, the refrigerant pipeline of the fourth heat exchanger, the refrigerant pipeline of the third heat exchanger, and the inlet of the helium compressor are connected end to end in sequence to form a loop.

[0017] Furthermore, the power supply unit includes: a second gas mixer and a hydrogen fuel cell;

[0018] One outlet of the gas source regulating unit is connected to one inlet of the second gas mixer; one outlet of the hydrogen storage unit is connected to another inlet of the second gas mixer; the outlet of the second gas mixer is connected to the inlet of the hydrogen fuel cell; the hydrogen fuel cell converts the received hydrogen into electrical energy to supply the electrical equipment in the hydrogen liquefaction unit.

[0019] The present invention also provides a method of using a hydrogen liquefaction device on an offshore platform, comprising:

[0020] When the amount of hydrogen entering the hydrogen separator exceeds the sum of the standard design flow rate of the hydrogen liquefaction unit and the minimum hydrogen intake required by the power supply unit, the first, second, and third channels of the hydrogen separator are all opened; the first one-way regulating valve is opened; the second one-way regulating valve, the first flow control valve, and the second flow control valve are closed. The first channel of the hydrogen separator supplies gas at the standard design flow rate of the hydrogen liquefaction unit; the third channel of the hydrogen separator supplies gas at the minimum hydrogen intake required by the power supply unit; the excess gas is replenished to the slow release tank through the second channel of the hydrogen separator. When the slow release tank is full of hydrogen, the first one-way regulating valve is closed, and the excess gas is distributed to the third channel of the hydrogen separator.

[0021] When the amount of hydrogen entering the hydrogen separator is greater than the minimum design flow rate of the hydrogen liquefaction unit but less than the standard design flow rate of the hydrogen liquefaction unit and the standard hydrogen intake required by the power supply unit, the first path of the hydrogen separator opens, while the second and third paths close. The second one-way regulating valve, the first flow control valve, and the second flow control valve open. The slow-release tank supplements the gas supply of the first path of the hydrogen separator through the first flow control valve, so that the sum of the gas volumes reaches the standard design flow rate of the hydrogen liquefaction unit. The slow-release tank then supplies the power supply unit with the minimum intake gas volume through the second flow control valve.

[0022] When the intake flow of the hydrogen separator is greater than the minimum intake flow required by the power supply unit but less than the standard design flow rate of the hydrogen liquefaction unit, the first passage and the second flow control valve of the hydrogen separator are both closed; the second passage, the third passage, the first one-way regulating valve, the second one-way regulating valve, and the first flow control valve of the hydrogen separator are all open, and the third passage of the hydrogen separator supplies gas at the minimum intake flow required by the power supply unit; excess gas is replenished to the slow release tank through the second passage of the hydrogen separator; the slow release tank is supplied with gas at the standard design flow rate of the hydrogen liquefaction unit through the first flow control valve.

[0023] When the intake volume of the hydrogen separator is less than the minimum intake volume required by the power supply unit, the first and third channels of the hydrogen separator are closed; the second channel, the first one-way regulating valve, the second one-way regulating valve, the first flow control valve, and the second flow control valve of the hydrogen separator are all opened; the slow release tank is supplied with gas at the minimum design flow rate of the hydrogen liquefaction unit through the first flow control valve; the slow release tank is supplied with gas at the minimum intake volume required by the power supply unit through the second flow control valve.

[0024] The beneficial effects of this invention are:

[0025] This invention does not require additional energy; it directly uses hydrogen produced by offshore wind power, photovoltaic hydrogen production sites, etc., and uses the power supply unit as the energy source for the electrical equipment in the device of this invention. It is not only convenient to collect, but also environmentally friendly.

[0026] This invention addresses the unstable hydrogen supply provided by offshore wind power and photovoltaic hydrogen production plants. By optimizing and improving the hydrogen liquefaction process, it transforms the hydrogen supply into a stable and continuous source, enabling the hydrogen liquefaction equipment to operate stably and efficiently for a long period of time.

[0027] This invention mixes the volatile gas from the liquid hydrogen container with the generated hydrogen gas as the supply for the hydrogen separator, effectively improving the utilization rate of hydrogen in a self-sufficient environment and enhancing the stability of the device operation.

[0028] This invention uses a heat exchanger to exchange heat between the generated hydrogen and the volatile gas in the liquid hydrogen container. By utilizing the volatile gas in the cryogenic liquid hydrogen container, the temperature of the generated hydrogen is reduced, which can effectively reduce the power consumption of the hydrogen compressor and improve the energy utilization rate in a self-sufficient environment. Attached Figure Description

[0029] The features and advantages of the invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the invention in any way. In the drawings:

[0030] Figure 1 This is a schematic diagram of the pipeline according to a specific embodiment of the present invention;

[0031] Figure 2 A block diagram showing the direction of hydrogen flow and the direction of electrical energy flow, which is a specific embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the first type of pipeline connection according to a specific embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the second type of pipeline connection according to a specific embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the third type of pipeline connection according to a specific embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the fourth type of pipeline connection according to a specific embodiment of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figure 1 , 2 As shown, an embodiment of the present invention provides a hydrogen liquefaction device for an offshore platform, comprising:

[0038] Air intake unit, air source regulation unit, power supply unit, hydrogen storage unit, hydrogen liquefaction unit, liquid hydrogen container;

[0039] Externally generated hydrogen and volatile hydrogen from the liquid hydrogen container are both fed into the intake unit; the intake unit supplies the externally generated hydrogen to the gas source regulating unit; the gas source regulating unit distributes the hydrogen to the hydrogen liquefaction unit, the power supply unit, and the hydrogen storage unit according to the distribution settings; the hydrogen storage unit supplies the stored hydrogen to the hydrogen liquefaction unit and / or the power supply unit according to the control signal; the hydrogen liquefaction unit liquefies the received hydrogen and stores it in the liquid hydrogen container; the power supply unit converts the received hydrogen into electrical energy to supply the various electrical devices in the hydrogen liquefaction unit.

[0040] The gas intake unit includes: heat exchanger 1 and third gas mixer 2; the gas source regulation unit includes: hydrogen separator 3 and separator control console 29; the hydrogen storage unit includes: slow release tank 17, first one-way regulating valve 16, second one-way regulating valve 18, first flow control valve 19, and second flow control valve 20; the power supply unit includes: second gas mixer 21 and hydrogen fuel cell 22; the hydrogen liquefaction unit includes: first gas mixer 4, hydrogen compressor 5, first heat exchanger 6, second heat exchanger 13, third heat exchanger 15, fourth heat exchanger 7, fifth heat exchanger 8, helium compressor 14, helium expander 9, JT valve 11, and positive hydrogen catalyst 12.

[0041] The generated hydrogen gas m is connected to the inlet of the heat medium G1 of heat exchanger 1, and the outlet of the heat medium G1 of heat exchanger 1 is connected to one inlet I1 of the third gas mixer 2. The vaporizer n output from the evaporator k of liquid hydrogen container 10 is connected to the inlet of the refrigerant G2 of heat exchanger 1, and the outlet of the refrigerant G2 of heat exchanger 1 is connected to another inlet I2 of the third gas mixer 2. The separator control console 29 is connected to the controlled end of hydrogen separator 3 to control the gas output state of hydrogen separator 3. The first outlet o1 of hydrogen separator 3 is connected to one inlet I1 of the first gas mixer 4. The second outlet o2 of hydrogen separator 3 is connected to the inlet pipe of the slow release tank 17. A first one-way regulating valve 16 is connected in series in the pipeline between the two; the third outlet O3 of the hydrogen separator 3 is connected to one inlet I2 of the second gas mixer 21; the outlet of the slow-release tank 17 is connected to one end of the pipeline of the second one-way regulating valve 18; the other end of the second one-way regulating valve 18 is connected to one end of the pipeline of the first flow control valve 19 and one end of the pipeline of the second flow control valve 20; the other end of the first flow control valve 19 is connected to another inlet I2 of the first gas mixer 4; the other end of the second flow control valve 20 is connected to another inlet I1 of the second gas mixer 21; the outlet of the second gas mixer 21 is connected to the hydrogen fuel cell. The inlet pipe of 22 is connected; the hydrogen fuel cell 22 supplies power to the electrical equipment in the device, such as the hydrogen compressor, helium compressor, and helium expander; the outlet of the first gas mixer 4 is connected to the inlet pipe of the hydrogen compressor 5; the outlet of the hydrogen compressor 5, the heat medium pipe A1 of the first heat exchanger 6, one heat medium pipe F1 of the fourth heat exchanger 7, the hydrogen catalyst 12, one heat medium pipe D1 of the fifth heat exchanger 8, the JT valve 11, and the inlet of the liquid hydrogen container 10 are connected end to end in sequence to form a passage for heat exchange and liquefaction of hydrogen, which is then stored in the liquid hydrogen container 10; the refrigerant pipe A2 of the first heat exchanger 6 and the refrigerant pipe B2 of the second heat exchanger 13 are connected. The heat transfer medium pipeline C3 of the third heat exchanger 15 is connected end to end in sequence to form a loop, which is filled with liquid nitrogen. The outlet of the helium compressor 14, the other heat transfer medium pipeline C1 of the third heat exchanger 15, the heat transfer medium pipeline B1 of the second heat exchanger 13, the other heat transfer medium pipeline F2 of the fourth heat exchanger 7, the other heat transfer medium pipeline D2 of the fifth heat exchanger 8, the inlet of the helium expander 9, the outlet of the helium expander 9, the refrigerant pipeline D3 of the fifth heat exchanger 8, the refrigerant pipeline F3 of the fourth heat exchanger 7, the refrigerant pipeline C2 of the third heat exchanger 15, and the inlet of the helium compressor 14 are connected end to end in sequence to form a loop. The loop exchanges heat with nitrogen and hydrogen through helium.

[0042] This invention rationally distributes the generated and volatilized hydrogen, and combines the hydrogen supply with the replenishment of the slow-release tank. Under the premise of ensuring liquid hydrogen production, the power supply unit consumes part of the hydrogen to generate electricity to power various electrical devices, forming a self-sufficient working environment that can be fully adapted to the deep-sea environment.

[0043] This invention also provides a method of using a specific embodiment of a hydrogen liquefaction device for offshore platforms, which is divided into four different operating modes based on the amount of hydrogen intake, including:

[0044] The specific operation of Mode 1 is as follows: When the amount of hydrogen entering the hydrogen separator 3 is greater than the sum of the standard design flow rate of the hydrogen liquefaction unit and the minimum hydrogen intake required by the power supply unit, the first, second, and third channels of the hydrogen separator 3 are all opened; the first one-way regulating valve 16 is opened; the second one-way regulating valve 18, the first flow control valve 19, and the second flow control valve 20 are closed. According to the hydrogen intake ratio set on the separator control panel 29, the first channel of the hydrogen separator 3 supplies gas at the standard design flow rate of the hydrogen liquefaction unit; the third channel of the hydrogen separator 3 supplies gas at the minimum hydrogen intake required by the power supply unit to ensure a continuous supply of electrical energy to the liquefaction unit; excess gas is replenished to the slow release tank 17 through the second channel of the hydrogen separator 3. When the slow release tank 17 is full of hydrogen, the first one-way regulating valve 16 is closed, and the second one-way regulating valve 18 and the second flow control valve 20 are opened to distribute the excess gas to the third channel of the hydrogen separator 3. The pipeline connection method is as follows: Figure 3 As shown;

[0045] The specific operation of Mode 2 is as follows: When the amount of hydrogen entering the hydrogen separator 3 is greater than the minimum design flow rate of the hydrogen liquefaction unit but less than the standard design flow rate of the hydrogen liquefaction unit and the standard hydrogen intake required by the power supply unit, the first path of the hydrogen separator 3 opens, and the second and third paths of the hydrogen separator 3 close; the second one-way regulating valve 18, the first flow control valve 19, and the second flow control valve 20 open; the slow-release tank 17 supplements the gas supply of the first path of the hydrogen separator 3 through the first flow control valve 19, so that the sum of the gas volumes reaches the standard design flow rate of the hydrogen liquefaction unit; the slow-release tank 17 provides the power supply unit with the minimum intake gas volume through the second flow control valve 20, so that it meets the power requirements for continuous supply of liquefaction unit. The pipeline connection method is as follows: Figure 4 As shown;

[0046] The specific operation of Mode 3 is as follows: When the gas intake of hydrogen separator 3 is greater than the minimum gas intake required by the power supply unit but less than the standard design flow rate of the hydrogen liquefaction unit, the first passage and the second flow control valve 20 of hydrogen separator 3 are both closed; the second and third passages, the first one-way regulating valve 16, the second one-way regulating valve 18, and the first flow control valve 19 of hydrogen separator 3 are all opened. The third passage of hydrogen separator 3 supplies gas at the minimum gas intake required by the power supply unit to meet the power requirements for continuous supply of liquefaction unit; excess gas is replenished to the slow release tank 17 through the second passage of hydrogen separator 3; the slow release tank 17 is supplied gas at the standard design flow rate of the hydrogen liquefaction unit through the first flow control valve 19. The pipeline connection method is as follows: Figure 5 As shown;

[0047] The specific operation of Mode 4 is as follows: When the intake volume of hydrogen separator 3 is less than the minimum intake volume required by the power supply unit, the first and third channels of hydrogen separator 3 are closed; the second channel of hydrogen separator 3, the first one-way regulating valve 16, the second one-way regulating valve 18, the first flow control valve 19, and the second flow control valve 20 are all opened; the slow-release tank 17 is supplied with gas through the first flow control valve 19 at the minimum design flow rate of the hydrogen liquefaction unit; the slow-release tank 17 is supplied with gas through the second flow control valve 20 at the minimum intake volume required by the power supply unit, so as to meet the power energy required for continuous supply of the liquefaction unit. The pipeline connection method is as follows: Figure 6 As shown.

[0048] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An offshore platform hydrogen liquefier comprising: A liquid hydrogen container and a hydrogen liquefaction unit, characterized in that they further include: an inlet unit, a gas source regulation unit, a power supply unit, and a hydrogen storage unit; Externally generated hydrogen is fed into the intake unit; the intake unit supplies the externally generated hydrogen to the gas source regulating unit; the gas source regulating unit distributes the hydrogen to the hydrogen liquefaction unit, the power supply unit, and the hydrogen storage unit according to the distribution settings; the hydrogen storage unit supplies the stored hydrogen to the hydrogen liquefaction unit and / or the power supply unit according to the control signal; the hydrogen liquefaction unit liquefies the received hydrogen and stores it in a liquid hydrogen container; the power supply unit converts the received hydrogen into electrical energy to supply the electrical equipment in the hydrogen liquefaction unit. The gas source regulation unit includes: a hydrogen separator and a separator control console; The generated hydrogen gas is fed into the inlet of the hydrogen separator through the inlet unit; the separator control console is connected to the controlled end of the hydrogen separator to control the gas output status of the hydrogen separator; the first outlet of the hydrogen separator is connected to the inlet pipeline of the hydrogen liquefaction unit; the second outlet of the hydrogen separator is connected to the inlet pipeline of the hydrogen storage unit; and the third outlet of the hydrogen separator is connected to the inlet pipeline of the power supply unit. The hydrogen storage unit includes: a slow-release tank, a first one-way regulating valve, a second one-way regulating valve, a first flow control valve, and a second flow control valve; One end of the first one-way regulating valve serves as the inlet of the hydrogen storage unit, and the other end is connected to the inlet pipeline of the slow-release tank; the outlet of the slow-release tank is connected to one end of the pipeline of the second one-way regulating valve; the other end of the second one-way regulating valve is connected to one end of the pipeline of the first flow control valve and one end of the pipeline of the second flow control valve; the other end of the first flow control valve is connected to the inlet pipeline of the hydrogen liquefaction unit; the other end of the second flow control valve is connected to the inlet pipeline of the power supply unit. The intake unit includes a third gas mixer and a heat exchanger; the generated hydrogen is fed into the heat medium inlet of the heat exchanger, and the heat medium outlet of the heat exchanger is connected to one of the intake pipes of the third gas mixer; the volatile gas outlet of the liquid hydrogen container is fed into the refrigerant inlet of the heat exchanger, and the refrigerant outlet of the heat exchanger is connected to another intake pipe of the third gas mixer; the outlet of the third gas mixer is connected to the intake pipe of the gas source regulating unit. The power supply unit includes: a second gas mixer and a hydrogen fuel cell; One outlet of the gas source regulating unit is connected to one inlet of the second gas mixer; one outlet of the hydrogen storage unit is connected to another inlet of the second gas mixer; the outlet of the second gas mixer is connected to the inlet of the hydrogen fuel cell; the hydrogen fuel cell converts the received hydrogen into electrical energy to supply the electrical equipment in the hydrogen liquefaction unit.

2. The offshore platform hydrogen liquefier of claim 1, wherein, The hydrogen liquefaction unit includes: a first gas mixer, a hydrogen compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger, a helium compressor, a helium expander, a JT valve, and a neutral hydrogen catalyst. One outlet of the gas source regulating unit is connected to one inlet pipe of the first gas mixer; one outlet of the hydrogen storage unit is connected to another inlet pipe of the first gas mixer; the outlet of the first gas mixer is connected to the inlet pipe of the hydrogen compressor; the outlet of the hydrogen compressor, the heat medium pipe of the first heat exchanger, one heat medium pipe of the fourth heat exchanger, the positive hydrogen catalyst, one heat medium pipe of the fifth heat exchanger, the JT valve, and the inlet of the liquid hydrogen container are connected end to end in sequence to form a passage; the refrigerant pipe of the first heat exchanger... The refrigerant pipeline of the first heat exchanger, the refrigerant pipeline of the second heat exchanger, and the heat medium pipeline of the third heat exchanger are connected end to end in sequence to form a loop; the outlet of the helium compressor, the other heat medium pipeline of the third heat exchanger, the heat medium pipeline of the second heat exchanger, the other heat medium pipeline of the fourth heat exchanger, the other heat medium pipeline of the fifth heat exchanger, the inlet of the helium expander, the outlet of the helium expander, the refrigerant pipeline of the fifth heat exchanger, the refrigerant pipeline of the fourth heat exchanger, the refrigerant pipeline of the third heat exchanger, and the inlet of the helium compressor are connected end to end in sequence to form a loop.

3. A method of use of a hydrogen liquefier on an offshore platform, suitable for use with a hydrogen liquefier on an offshore platform as claimed in claim 1 or 2, characterised in that, The method of using the offshore platform hydrogen liquefaction unit includes: When the amount of hydrogen entering the hydrogen separator exceeds the sum of the standard design flow rate of the hydrogen liquefaction unit and the minimum hydrogen intake required by the power supply unit, the first, second, and third channels of the hydrogen separator are all opened; the first one-way regulating valve is opened; the second one-way regulating valve, the first flow control valve, and the second flow control valve are closed. The first channel of the hydrogen separator supplies gas at the standard design flow rate of the hydrogen liquefaction unit; the third channel of the hydrogen separator supplies gas at the minimum hydrogen intake required by the power supply unit; the excess gas is replenished to the slow release tank through the second channel of the hydrogen separator. When the slow release tank is full of hydrogen, the first one-way regulating valve is closed, and the excess gas is distributed to the third channel of the hydrogen separator. When the amount of hydrogen entering the hydrogen separator is greater than the minimum design flow rate of the hydrogen liquefaction unit but less than the standard design flow rate of the hydrogen liquefaction unit and the standard hydrogen intake required by the power supply unit, the first path of the hydrogen separator opens, while the second and third paths close. The second one-way regulating valve, the first flow control valve, and the second flow control valve open. The slow-release tank supplements the gas supply of the first path of the hydrogen separator through the first flow control valve, so that the sum of the gas volumes reaches the standard design flow rate of the hydrogen liquefaction unit. The slow-release tank then supplies the power supply unit with the minimum intake gas volume through the second flow control valve. When the intake flow of the hydrogen separator is greater than the minimum intake flow required by the power supply unit but less than the standard design flow rate of the hydrogen liquefaction unit, both the first and second flow control valves of the hydrogen separator are closed; the second and third flows, the first one-way regulating valve, the second one-way regulating valve, and the first flow control valve of the hydrogen separator are all open, and the third flow of the hydrogen separator supplies gas at the minimum intake flow required by the power supply unit; excess gas is replenished to the slow-release tank through the second flow of the hydrogen separator; the slow-release tank is supplied gas at the standard design flow rate of the hydrogen liquefaction unit through the first flow control valve. When the intake volume of the hydrogen separator is less than the minimum intake volume required by the power supply unit, the first and third channels of the hydrogen separator are closed; the second channel, the first one-way regulating valve, the second one-way regulating valve, the first flow control valve, and the second flow control valve of the hydrogen separator are all opened; the slow release tank is supplied with gas at the minimum design flow rate of the hydrogen liquefaction unit through the first flow control valve; the slow release tank is supplied with gas at the minimum intake volume required by the power supply unit through the second flow control valve.

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