Hydrogen supply system based on liquid hydrogen storage and flow adjusting method thereof

Abstract

The invention discloses a hydrogen supply system based on liquid hydrogen storage. The hydrogen supply system comprises a liquid hydrogen storage tank, a liquid hydrogen pipeline, a hydrogen supply main pipeline, a flow rough adjusting assembly and a flow accurate adjusting assembly. The flow rough adjusting assembly comprises a liquid hydrogen pump arranged on the liquid hydrogen pipeline, a first control valve and a gasifier are sequentially arranged on the liquid hydrogen pipeline at the rear end of the liquid hydrogen pump, and a first flow meter and a tee joint used for gathering gaseous hydrogen branch pipelines are arranged on the hydrogen supply main pipeline; the liquid hydrogen pipeline between the liquid hydrogen pump and the first control valve is connected with a backflow pipeline, and a second control valve is arranged on the backflow pipeline; the flow accurate adjusting assembly comprises a gaseous hydrogen branch pipeline, the inlet end of the gaseous hydrogen branch pipeline is connected with the liquid hydrogen storage tank, a third control valve, a low-temperature hydrogen booster pump and a second flow meter are sequentially arranged on the gaseous hydrogen branch pipeline, and the outlet end of the gaseous hydrogen branch pipeline is connected with a tee joint located at the rear end of the first flow meter on the hydrogen supply main pipeline. An emptying pipeline is arranged at the front end of the gaseous hydrogen branch pipeline; and a fourth control valve is arranged on the emptying pipeline.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen supply for hydrogen fuel cells and hydrogen engines using liquid hydrogen storage, and in particular to a hydrogen supply system based on liquid hydrogen storage and a flow regulation method thereof. Background Art

[0002] Liquid hydrogen has a higher storage density and can meet the needs of long-distance driving in multiple scenarios, such as hydrogen heavy trucks, hydrogen ships, hydrogen drones, etc. Since liquid hydrogen is stored in a low-temperature liquid state, it needs to go through phase change, temperature adjustment, pressure adjustment and other steps before hydrogen can be used for fuel cells and engines. Therefore, the realization of various parameters is more complicated than other hydrogen storage methods. Among them, the control of hydrogen supply pressure and flow is one of the core technologies of liquid hydrogen fuel cell hydrogen supply system.

[0003] The flow rate and pressure of hydrogen supply are proportionally adjusted by regulating valves after being gasified by liquid hydrogen to a buffer tank for storage. However, the flow rate adjustment of the liquid hydrogen pump is limited by the response speed of the variable frequency motor, resulting in a slow response of the flow rate of liquid hydrogen pressurization and gasification, and the flow volume of the hydrogen regulating valve is small, which cannot be applied to the rapid response of the flow rate and pressure of hydrogen supply for large-span liquid hydrogen gasification. Therefore, how to make the hydrogen liquefaction speed respond faster and the hydrogen flow rate and pressure supply quickly, so as to realize the rapid adjustment of the engine power of aviation and large ships, is of great significance for the large-scale application of liquid hydrogen storage in aviation and large ships.

[0004] For example, the application document with patent number 202210393332.5 discloses a liquid hydrogen supply system for high-pressure fuel cells, including a thermal compression and boosting system and a heat circulation system for liquid hydrogen gasification. The heat circulation system recycles the waste heat generated by the fuel cell system and is connected to the first-level heat exchanger in the thermal compression and boosting system to provide heat for liquid hydrogen gasification; the thermal compression and boosting system is also connected to the liquid hydrogen supply system and the gaseous hydrogen supply system, wherein the liquid hydrogen flows into a deep-cold high-pressure hydrogen storage container through the liquid hydrogen supply system, and gaseous compressed hydrogen is obtained after heat exchange, and flows into the fuel cell system through the gaseous hydrogen supply system; the gaseous compressed hydrogen can flow back to the liquid hydrogen storage container to provide liquid hydrogen supply pressure.

[0005] The solenoid valve and pressure reducing valve used in the above scheme are only used to achieve steady-state pressure and flow supply of compressed gas at room temperature, and the configuration of deep-cold high-pressure storage containers increases the volume of system equipment. Within the flow regulation range required by large hydrogen fuel engines for aviation and ships, it is not feasible to achieve flow and pressure regulation of hydrogen supply by configuring large-capacity gas buffer tanks. Summary of the invention

[0006] The purpose of the present invention is to provide a hydrogen supply system based on liquid hydrogen storage and a flow regulation method thereof, so that the hydrogen liquefaction speed responds faster and the hydrogen flow rate and pressure are supplied quickly, thereby realizing rapid regulation of engine power for aviation and large ships, etc., which is of great significance for the large-scale application of liquid hydrogen storage in aviation and large ships.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] A hydrogen supply system based on liquid hydrogen storage, comprising a liquid hydrogen storage tank, a liquid hydrogen pipeline and a hydrogen supply main pipeline, wherein the inlet end of the liquid hydrogen pipeline is connected to the liquid hydrogen storage tank, and the liquid hydrogen entering the liquid hydrogen pipeline is gasified by a gasifier, and then enters the rear end hydrogen supply main pipeline, and is output from an output interface provided at the outlet end of the hydrogen supply main pipeline, wherein the hydrogen supply system comprises a flow rate coarse adjustment component and a flow rate precise adjustment component;

[0009] The rough flow adjustment component includes a liquid hydrogen pump arranged on the liquid hydrogen pipeline, a first control valve and a vaporizer are arranged in sequence on the liquid hydrogen pipeline at the rear end of the liquid hydrogen pump, a return pipeline is connected to the liquid hydrogen pipeline between the liquid hydrogen pump and the first control valve, and a second control valve is arranged on the return pipeline; a hydrogen supply main pipeline is arranged at the rear end of the vaporizer, and a first flow meter and a three-way connector for connecting a gaseous hydrogen branch pipeline are arranged on the hydrogen supply main pipeline;

[0010] The flow precision regulation component includes a gaseous hydrogen branch pipeline, the inlet end of the gaseous hydrogen branch pipeline is connected to the liquid hydrogen storage tank, a third control valve, a low-temperature hydrogen booster pump and a second flow meter are sequentially arranged on the gaseous hydrogen branch pipeline, the outlet end of the gaseous hydrogen branch pipeline is connected to the hydrogen supply main pipeline, a venting pipeline is arranged at the front end of the gaseous hydrogen branch pipeline, and a fourth control valve is arranged on the venting pipeline.

[0011] Furthermore, the liquid hydrogen storage tank is provided with a self-pressurizing pipeline, the inlet and outlet ends of the self-pressurizing pipeline are respectively connected to the liquid hydrogen storage tank, and a first manual valve, a second manual valve, a fifth control valve and a self-boosting device are provided on the self-pressurizing pipeline. The first manual valve, the second manual valve and the fifth control valve are used to control the on-off of the self-pressurizing pipeline, and the self-boosting device is used to convert liquid hydrogen into gaseous hydrogen to stabilize the pressure in the liquid hydrogen storage tank.

[0012] Furthermore, the liquid hydrogen storage tank is provided with a measuring pipeline, the inlet and outlet ends of the measuring pipeline are respectively connected to the liquid hydrogen storage tank, and a combined differential pressure gauge is provided on the measuring pipeline, which is used to measure the pressure difference between the inlet and outlet ends of the liquid hydrogen storage tank.

[0013] Furthermore, the liquid hydrogen storage tank is provided with a liquid inlet pipeline, and a third manual valve is provided at the liquid inlet end of the liquid inlet pipeline.

[0014] A flow regulation method for a hydrogen supply system based on liquid hydrogen storage comprises the following steps:

[0015] The liquid hydrogen pump starts to work, and the liquid hydrogen stored in the liquid hydrogen storage tank is introduced into the liquid hydrogen pipeline. The second control valve located on the reflux pipeline and the first control valve located on the liquid hydrogen pipeline are both kept at a certain opening. At this time, part of the liquid hydrogen flows back to the liquid hydrogen storage tank through the reflux pipeline, and the other part of the liquid hydrogen enters the vaporizer and the first flowmeter at the rear end of the liquid hydrogen pipeline;

[0016] The flow of liquid hydrogen introduced into the liquid hydrogen pipeline is controlled by the variable frequency motor of the liquid hydrogen pump. The displacement of the liquid hydrogen pump is adjusted by changing the speed of the variable frequency motor to achieve the regulation of the liquid hydrogen flow. On this basis, the flow of liquid hydrogen flowing through the reflux pipeline and the liquid hydrogen pipeline is adjusted by adjusting the opening of the second control valve and the first control valve, thereby achieving a rough regulation of the liquid hydrogen flow in the liquid hydrogen pipeline.

[0017] When the system is working, the liquid hydrogen storage tank will generate gaseous hydrogen, which will be introduced into the gaseous hydrogen branch pipeline, and the flow entering the hydrogen supply main pipeline will be adjusted by the third control valve and the fourth control valve arranged on the gaseous hydrogen branch pipeline, so as to realize the precise adjustment of the liquid hydrogen flow in the hydrogen supply main pipeline;

[0018] During the rough and precise adjustment of the liquid hydrogen flow, the first flow meter and the second flow meter will respectively send the real-time flow through the hydrogen supply main pipeline and the gaseous hydrogen branch pipeline to the control system. The control system will feedback the control signal to the first control valve, the second control valve and the third control valve according to the real-time flow to realize automatic control of the flow.

[0019] In summary, the present invention has the following beneficial effects:

[0020] The liquid hydrogen in the liquid hydrogen storage tank flows through the liquid hydrogen pipeline, and the first flowmeter on the liquid hydrogen pipeline feeds back the flow signal to the control system. The gaseous hydrogen evaporated from the liquid hydrogen storage tank flows to the hydrogen supply main pipeline through the gaseous hydrogen branch pipeline. The control system obtains the flow signal of the second flowmeter on the gaseous hydrogen branch pipeline. The control system combines the flow signals of the first flowmeter and the second flowmeter as well as the target flow value, and feeds back the opening signal to the first control valve, the second control valve and the third control valve to achieve rough and precise regulation of the flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the hydrogen supply system based on liquid hydrogen storage according to the present invention. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with diagrams and specific embodiments.

[0023] like Figure 1 As shown, a hydrogen supply system based on liquid hydrogen storage proposed in the present invention comprises a liquid hydrogen storage tank 1, a liquid hydrogen pipeline 5 and a hydrogen supply main pipeline, wherein the inlet end of the liquid hydrogen pipeline 5 is connected to the liquid hydrogen storage tank 1, and the liquid hydrogen entering the liquid hydrogen pipeline 5 is gasified by the gasifier 54, and then enters the rear end hydrogen supply main pipeline, and is output from the output interface 7 provided at the outlet end of the hydrogen supply main pipeline, and the hydrogen supply system comprises a flow rate coarse adjustment component and a flow rate precise adjustment component;

[0024] The rough flow control assembly includes a liquid hydrogen pump 52 arranged on the liquid hydrogen pipeline 5, a first control valve 53 and a vaporizer 54 are sequentially arranged on the liquid hydrogen pipeline 5 at the rear end of the liquid hydrogen pump 52, a reflux pipeline 8 is connected to the liquid hydrogen pipeline 5 between the liquid hydrogen pump 52 and the first control valve 53, and a second control valve 51 is arranged on the reflux pipeline 8; a hydrogen supply main pipeline is arranged at the rear end of the vaporizer 54, and a first flow meter 55 and a three-way connector for connecting the gaseous hydrogen branch pipeline 2 are arranged on the hydrogen supply main pipeline;

[0025] The flow precision regulation component includes a gaseous hydrogen branch pipeline 2, the inlet end of the gaseous hydrogen branch pipeline 2 is connected to the liquid hydrogen storage tank 1, and a third control valve 21, a low-temperature hydrogen booster pump 23 and a second flow meter 24 are sequentially arranged on the gaseous hydrogen branch pipeline 2, and the outlet end of the gaseous hydrogen branch pipeline 2 is connected to the hydrogen supply main pipeline. A venting pipeline 22 is arranged at the front end of the gaseous hydrogen branch pipeline 2, and a fourth control valve 22 is arranged on the venting pipeline 22.

[0026] The liquid hydrogen storage tank 1 is provided with a self-pressurizing pipeline 3, the inlet end and the outlet end of the self-pressurizing pipeline 3 are respectively connected to the liquid hydrogen storage tank 1, and a first manual valve 31, a second manual valve 34, a fifth control valve 32 and a self-pressurizer 33 are provided on the self-pressurizing pipeline 3. The first manual valve 31, the second manual valve 34 and the fifth control valve 32 are used to control the on-off of the self-pressurizing pipeline 3, and the self-pressurizer 33 is used to convert liquid hydrogen into gaseous hydrogen to stabilize the pressure in the liquid hydrogen storage tank 1.

[0027] The liquid hydrogen storage tank 1 is provided with a measuring pipe 4, the inlet end and the outlet end of the measuring pipe 4 are respectively connected to the liquid hydrogen storage tank 1, and a combined differential pressure gauge 41 is provided on the measuring pipe 4, which is used to measure the pressure difference between the inlet end and the outlet end of the liquid hydrogen storage tank 1.

[0028] The liquid hydrogen storage tank 1 is provided with a liquid inlet pipeline 6 , and a third manual valve 61 is provided at the liquid inlet end of the liquid inlet pipeline 6 .

[0029] A flow regulation method for a hydrogen supply system based on liquid hydrogen storage comprises the following steps:

[0030] 1) The liquid hydrogen pump 52 starts to work, and the liquid hydrogen stored in the liquid hydrogen storage tank 1 is introduced into the liquid hydrogen pipeline 5. The second control valve 51 located on the reflux pipeline and the first control valve 53 located on the liquid hydrogen pipeline 5 are both kept at a certain opening. At this time, part of the liquid hydrogen flows back to the liquid hydrogen storage tank 1 through the reflux pipeline, and the other part of the liquid hydrogen enters the vaporizer 54 at the rear end of the liquid hydrogen pipeline 5 and the first flowmeter 55 on the hydrogen supply main pipe;

[0031] 2) The flow rate of liquid hydrogen introduced into the liquid hydrogen pipeline 5 is controlled by the variable frequency motor of the liquid hydrogen pump 52. The displacement of the liquid hydrogen pump 52 is adjusted by changing the speed of the variable frequency motor to achieve the regulation of the liquid hydrogen flow rate. On this basis, the flow rate of liquid hydrogen flowing through the reflux pipeline and the liquid hydrogen pipeline 5 is adjusted by adjusting the opening of the second control valve 51 and the first control valve 53, thereby achieving a rough regulation of the liquid hydrogen flow rate of the liquid hydrogen pipeline 5.

[0032] 3) When the system is working, the liquid hydrogen storage tank 1 will generate gaseous hydrogen, which will be introduced into the gaseous hydrogen branch pipeline 2, and the flow rate entering the liquid hydrogen pipeline 5 will be adjusted by the third control valve 21 and the fourth control valve 22 arranged on the gaseous hydrogen branch pipeline 2, so as to realize the precise adjustment of the liquid hydrogen flow rate of the liquid hydrogen pipeline 5;

[0033] 4) During the rough and precise adjustment of the liquid hydrogen flow rate, the first flow meter 55 and the second flow meter 24 will respectively send the real-time flow rate flowing through the hydrogen supply main pipe and the gaseous hydrogen branch pipe 2 to the control system. The control system will feedback the control signal to the first control valve 53, the second control valve 51 and the third control valve 21 according to the real-time flow rate to realize automatic control of the flow rate.

[0034] Example

[0035] Taking aircraft engines as an example, they generally go through the process of ignition-slow-takeoff-flight-slow-to-stop. As shown in Table 1, during the entire engine start-up to stop stage, the required hydrogen flow rate adjustment is about 5%-100% of the maximum flow rate. The following is a detailed description of the control method based on the hydrogen flow requirements of each stage:

[0036]

[0037] Table 1

[0038] Working condition 1: The ignition stage requires a small flow rate of hydrogen supply. The liquid hydrogen pump 52 is started and the power of the liquid hydrogen pump variable frequency motor is adjusted to set the hydrogen flow rate required in the slow-running stage, and the opening of the control valve 51 is increased or fully opened, and the opening of the control valve 53 is reduced or fully closed, so that more liquid hydrogen flows back to the liquid hydrogen storage tank. At the same time, the control valve 21 is opened and the low-temperature hydrogen booster pump 23 is started. With the start of the hydrogen booster pump, the pressure in the storage tank will gradually decrease. At this time, the control system detects the pressure drop in the storage tank through the combined differential pressure gauge 41, thereby increasing the opening of the control valve 32 and increasing the speed of the self-pressurization gasification of the storage tank.

[0039] Working condition 2: During the ignition-slow-speed stage, it is necessary to switch instantly from a small hydrogen supply flow rate to a larger flow rate, and the control valve 21 is fully opened to keep the low-temperature hydrogen booster pump 23 running. The power of the variable frequency motor of the liquid hydrogen pump 52 is adjusted to be set at the hydrogen flow rate required during the take-off stage. At the same time, the opening of the control valve 53 is increased, and the opening of the control valve 51 is adjusted proportionally, so that more liquid hydrogen flows toward the outlet and the excess flow is returned to the liquid hydrogen storage tank 1.

[0040] Working condition three: During the slow-start-takeoff phase, the hydrogen flow supply needs to be instantly switched to a larger flow rate, the control valve 21 is fully opened, the low-temperature hydrogen booster pump 23 is kept running, and the power of the variable frequency motor of the liquid hydrogen pump 52 is adjusted to maintain the hydrogen flow rate required during the takeoff phase. At the same time, the opening of the control valve 53 is increased, and the opening of the control valve 51 is adjusted proportionally, so that more liquid hydrogen flows toward the outlet while the excess flow is returned to the liquid hydrogen storage tank 1.

[0041] Working condition 4: During the navigation-slow stage, the hydrogen supply flow rate is instantaneously switched to a smaller flow rate, the control valve 21 is fully opened, the low-temperature hydrogen booster pump 23 is kept running, and the power of the variable frequency motor of the liquid hydrogen pump 52 is adjusted to be set at the hydrogen flow rate required in the slow stage. At the same time, the opening of the control valve 53 is reduced, and the opening of the control valve 51 is increased, so that less liquid hydrogen flows toward the outlet.

[0042] Working condition five: During the slow-speed vehicle-stopping stage, the hydrogen supply flow rate needs to be gradually switched to 0, the control valve 21 is closed, the low-temperature hydrogen booster pump 23 stops running, the power of the variable frequency motor of the liquid hydrogen pump 52 is set to 0, and the opening of the control valve 53 is 0. The opening of the control valve 51 is increased, so that the liquid hydrogen output during the shutdown stage of the liquid hydrogen pump flows back to the liquid hydrogen storage tank 1. The reflux of liquid hydrogen will increase the evaporation in the hydrogen storage tank 1. At this time, the opening of the control valve 22 is automatically adjusted according to the pressure in the liquid hydrogen storage tank 1.

[0043] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of expressing the technical solutions and the convenience of description, and therefore should not be understood as limitations of the present invention.

[0044] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydrogen supply system based on liquid hydrogen storage, comprising a liquid hydrogen storage tank (1), a liquid hydrogen pipeline (5) and a hydrogen supply main pipeline, wherein the inlet end of the liquid hydrogen pipeline (5) is connected to the liquid hydrogen storage tank (1), and the liquid hydrogen entering the liquid hydrogen pipeline (5) is gasified by a gasifier (54), and then enters the rear end of the hydrogen supply main pipeline, and is output from an output interface (7) provided at the outlet end of the hydrogen supply main pipeline, characterized in that: The hydrogen supply system includes a rough flow regulating component and a precise flow regulating component; The rough flow control component comprises a liquid hydrogen pump (52) arranged on a liquid hydrogen pipeline (5); a first control valve (53) and a vaporizer (54) are sequentially arranged on the liquid hydrogen pipeline (5) at the rear end of the liquid hydrogen pump (52); a return pipeline (8) is connected to the liquid hydrogen pipeline (5) between the liquid hydrogen pump (52) and the first control valve (53); a second control valve (51) is arranged on the return pipeline (8); a hydrogen supply main pipeline is arranged at the rear end of the vaporizer (54); a first flow meter (55) and a three-way connector for connecting to a gaseous hydrogen branch pipeline (2) are arranged on the hydrogen supply main pipeline; The flow precision regulation component comprises a gaseous hydrogen branch pipeline (2), the inlet end of the gaseous hydrogen branch pipeline (2) is connected to the liquid hydrogen storage tank (1), a third control valve (21), a low-temperature hydrogen booster pump (23) and a second flow meter (24) are sequentially arranged on the gaseous hydrogen branch pipeline (2), the outlet end of the gaseous hydrogen branch pipeline (2) is connected to the hydrogen supply main pipeline, a venting pipeline (22) is arranged at the front end of the gaseous hydrogen branch pipeline (2), and a fourth control valve (22) is arranged on the venting pipeline (22).

2. The hydrogen supply system based on liquid hydrogen storage according to claim 1, characterized in that: The liquid hydrogen storage tank (1) is provided with a self-pressurizing pipeline (3), the inlet end and the outlet end of the self-pressurizing pipeline (3) are respectively connected to the liquid hydrogen storage tank (1), and a first manual valve (31), a second manual valve (34), a fifth control valve (32) and a self-pressurizer (33) are provided on the self-pressurizing pipeline (3), the first manual valve (31), the second manual valve (34) and the fifth control valve (32) are used to control the on-off of the self-pressurizing pipeline (3), and the self-pressurizer (33) is used to convert liquid hydrogen into gaseous hydrogen to stabilize the pressure in the liquid hydrogen storage tank (1).

3. The hydrogen supply system based on liquid hydrogen storage according to claim 1, characterized in that: The liquid hydrogen storage tank (1) is provided with a measuring pipe (4), the inlet end and the outlet end of the measuring pipe (4) are respectively connected to the liquid hydrogen storage tank (1), and a combined differential pressure gauge (41) is provided on the measuring pipe (4) for measuring the pressure difference between the inlet end and the outlet end of the liquid hydrogen storage tank (1).

4. The hydrogen supply system based on liquid hydrogen storage according to claim 1, characterized in that: The liquid hydrogen storage tank (1) is provided with a liquid inlet pipeline (6), and a third manual valve (61) is provided at the liquid inlet end of the liquid inlet pipeline (6).

5. A flow regulation method for a hydrogen supply system based on liquid hydrogen storage, characterized in that: The steps include: 1) The liquid hydrogen pump (52) starts to work, and the liquid hydrogen stored in the liquid hydrogen storage tank (1) is introduced into the liquid hydrogen pipeline (5). The second control valve (51) located on the reflux pipeline (8) and the first control valve (53) located on the liquid hydrogen pipeline (5) are both kept at a certain opening. At this time, part of the liquid hydrogen flows back to the liquid hydrogen storage tank (1) through the reflux pipeline (8), and the other part of the liquid hydrogen enters the vaporizer (54) and the first flow meter (55) at the rear end of the liquid hydrogen pipeline (5); 2) The flow rate of liquid hydrogen introduced into the liquid hydrogen pipeline (5) is controlled by the variable frequency motor of the liquid hydrogen pump (52), and the displacement of the liquid hydrogen pump 52 is adjusted by changing the rotation speed of the variable frequency motor to achieve the regulation of the liquid hydrogen flow rate; on this basis, the flow rate of liquid hydrogen flowing through the return pipeline (8) and the liquid hydrogen pipeline (5) is adjusted by adjusting the opening of the second control valve (51) and the first control valve (53), thereby achieving a rough regulation of the liquid hydrogen flow rate of the liquid hydrogen pipeline (5); 3) When the system is working, the liquid hydrogen storage tank (1) generates gaseous hydrogen, which is introduced into the gaseous hydrogen branch pipeline (2), and the flow rate of the gaseous hydrogen entering the hydrogen supply main pipeline is adjusted by the third control valve (21) and the fourth control valve (22) arranged on the gaseous hydrogen branch pipeline (2), thereby realizing accurate adjustment of the flow rate of liquid hydrogen in the hydrogen supply main pipeline; 4) When roughly adjusting and precisely adjusting the liquid hydrogen flow rate, the first flow meter (55) and the second flow meter (24) will respectively send the real-time flow rate flowing through the hydrogen supply main pipeline and the gaseous hydrogen branch pipeline (2) to the control system, and the control system will feedback the control signal to the first control valve (53), the second control valve (51) and the third control valve (21) according to the real-time flow rate to realize automatic control of the flow rate.

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