Supercritical liquid hydrogen supply system and method

Abstract

The invention relates to the technical field of liquid hydrogen, in particular to a supercritical liquid hydrogen supply system and method. According to the technical scheme, the storage tank is vertically divided into two independent storage areas (namely the first cavity and the second cavity), so that when the temperature of liquid hydrogen rises due to supercritical transformation, exhaust cooling can be carried out on any independent storage area, and the temperature of the liquid hydrogen is reduced; then through a connecting channel (namely a communicating assembly arranged on a partition plate) of the two storage areas, flowing circulation is carried out spontaneously under driving of temperature difference and dynamic and static mixed flowing, so that cross-area transmission of cooling capacity is achieved, overall cooling of the interior of the storage tank can be achieved, temperature rise caused by supercritical transformation is eliminated, the stability of liquid hydrogen supply is guaranteed, and the service life of the storage tank is prolonged. And the liquid hydrogen supply time is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid hydrogen, and particularly relates to a liquid hydrogen supercritical supply system and method. Background Art

[0002] With the transformation of the global energy structure towards cleaner and lower-carbon directions, liquid hydrogen, with its hydrogen storage density of 70.78 kg / m 3 and transportation efficiency 850 times that of gaseous hydrogen, has become the core energy storage medium in fields such as aerospace, heavy transportation, and hydrogen refueling stations. By 2025, the number of hydrogen refueling stations in China has exceeded a thousand. As a key infrastructure, the pressure control technology of liquid hydrogen storage tanks directly affects the safety and economy of the hydrogen energy system.

[0003] Conventional hydrogen is often in a saturated state of gas-liquid two-phase. When both the temperature and pressure values of liquid hydrogen exceed its critical point (33.145 K, 1.2965 MPa), liquid hydrogen will enter the supercritical state, causing drastic changes in physical properties. In practical applications, especially in scenarios such as the filling system at a space launch site and the rapid refueling device for heavy hydrogen fuel cell vehicles, the supply pressure of the storage tank often needs to be increased to

[0004] 1.5 - 12 MPa to accelerate the transmission efficiency. At the same time, the pressurizing gas usually selects high-pressure hydrogen or helium with a temperature higher than the critical point temperature of 33.145 K. Therefore, when the pressure in the storage tank is higher than 1.2965 MPa, as the high-temperature pressurizing gas above the storage tank heats up the liquid hydrogen, the temperature of the liquid hydrogen will gradually rise. When the temperature also exceeds the critical point temperature of 33.145 K, this part of the liquid hydrogen will turn into supercritical hydrogen. Due to the disappearance of the gas-liquid two-phase, the conventional latent heat of gas-liquid phase change also does not exist, resulting in too fast heat transfer of the high-temperature pressurizing gas. At the same time, after the liquid hydrogen turns into supercritical hydrogen, the density of hydrogen drops sharply, the viscosity increases by 2 - 3 times, and the surface tension weakens. This sudden change in physical properties makes key equipment such as delivery pumps, flow meters, and pressure stabilizing valves designed based on two-phase flow face the risk of failure, which is becoming a bottleneck restricting the in-depth application of hydrogen energy technology.

[0005] Therefore, there is an urgent need to provide a liquid hydrogen supercritical supply system and method to solve the above technical problems. Summary of the Invention

[0006] Embodiments of the present invention provide a liquid hydrogen supercritical supply system and method, which can effectively eliminate the adverse effects of supercritical transformation and ensure the stability of liquid hydrogen supply.

[0007] In the first aspect, embodiments of the present invention provide a liquid hydrogen supercritical supply system, including:

[0008] A storage tank is internally provided with a partition plate. The partition plate is used to divide the internal cavity of the storage tank into a first cavity and a second cavity. The first cavity and the second cavity are used to store the liquid hydrogen to be supplied. A communication component is arranged on the partition plate and is used to selectively communicate the first cavity and the second cavity;

[0009] A pressurization component is arranged at the top of the storage tank and is respectively communicated with the first cavity and the second cavity. The pressurization component is used to introduce pressurized gas into the first cavity and / or the second cavity;

[0010] An exhaust component is arranged at the top of the storage tank and is respectively communicated with the first cavity and the second cavity. The exhaust component is used to discharge the hydrogen medium above the first cavity or the second cavity out of the storage tank;

[0011] A supply component is arranged at the bottom of the storage tank and is respectively communicated with the first cavity and the second cavity. The supply component is used to supply liquid hydrogen to an external usage end;

[0012] When the liquid hydrogen turns into supercritical hydrogen, control the pressurization component to stop ventilating the first cavity or the second cavity, and control the exhaust component to exhaust the cavity with the ventilation closed to realize the pressure reduction and temperature reduction of the cavity; after the pressure reduction and temperature reduction are completed, close the exhaust of the cavity and at the same time control the pressurization component to ventilate the cavity until the pressures in the two cavities are equal, and open the communication component to realize the spontaneous mixing of the hydrogen medium in the first cavity and the second cavity.

[0013] In a second aspect, an embodiment of the present invention provides a method for supplying supercritical liquid hydrogen, which is applied to the system described in the above embodiment, and includes:

[0014] Step S1, liquid hydrogen filling stage: Open the first exhaust valve, the second exhaust valve, the liquid hydrogen filling valve, the first communication valve and the second communication valve, adjust the opening degrees of the first regulating valve and the second regulating valve to the fully open state, supply the external liquid hydrogen to the first cavity and the second cavity respectively through the first supply pipeline and the second supply pipeline. When the liquid level heights of the first cavity and the second cavity reach a preset height, stop filling the liquid hydrogen, close the liquid hydrogen filling valve, and adjust the opening degrees of the first regulating valve and the second regulating valve to the fully closed state;

[0015] Step S2, Liquid hydrogen supply stage: Close the first exhaust valve and the second exhaust valve, open the first booster valve, the second booster valve and the liquid hydrogen supply valve, adjust the opening degrees of the first regulating valve and the second regulating valve to 50%, and introduce the external booster gas into the first cavity and the second cavity respectively through the first booster pipeline and the second booster pipeline, so that the liquid hydrogen in the first cavity and the second cavity is supplied to the external usage end through the liquid hydrogen supply valve;

[0016] Step S3, Exhaust and cooling stage: It includes the exhaust and cooling stage for the first cavity and the exhaust and cooling stage for the second cavity, where:

[0017] The exhaust and cooling stage for the first cavity includes: Close the first communication valve and the second communication valve, gradually adjust the opening degree of the first regulating valve from 50% to 0%, gradually adjust the opening degree of the second regulating valve from 50% to 100%, close the first booster valve, open the first exhaust valve, and when the internal pressure of the first cavity is equal to the atmospheric pressure, close the first exhaust valve; Open the first booster valve to boost the pressure of the first cavity, and when the internal pressures of the first cavity and the second cavity are equal, open the first communication valve and the second communication valve to realize the spontaneous mixing of the hydrogen medium in the first cavity and the second cavity, thereby reducing the temperature of the liquid hydrogen in the second cavity; Gradually adjust the opening degree of the first regulating valve from 0% to 50%, gradually adjust the opening degree of the second regulating valve from 100% to 50%, and resume normal liquid supply;

[0018] The exhaust and cooling stage for the second cavity includes: Close the first communication valve and the second communication valve, gradually adjust the opening degree of the second regulating valve from 50% to 0%, gradually adjust the opening degree of the first regulating valve from 50% to 100%, close the second booster valve, open the second exhaust valve, and when the internal pressure of the second cavity is equal to the atmospheric pressure, close the second exhaust valve; Open the second booster valve to boost the pressure of the second cavity, and when the internal pressures of the second cavity and the first cavity are equal, open the first communication valve and the second communication valve to realize the spontaneous mixing of the hydrogen medium in the first cavity and the second cavity, thereby reducing the temperature of the liquid hydrogen in the first cavity; Gradually adjust the opening degree of the second regulating valve from 0% to 50%, gradually adjust the opening degree of the first regulating valve from 100% to 50%, and resume normal liquid supply.

[0019] An embodiment of the present invention provides a liquid hydrogen supercritical supply system and method. By vertically partitioning a storage tank into two independent storage areas (i.e., a first cavity and a second cavity), when the temperature of liquid hydrogen increases due to supercritical transition, exhaust cooling can be performed on any independent storage area. Subsequently, through the connection channels between the two storage areas (i.e., the communication components provided on the partition), spontaneous flow circulation is driven by the temperature difference and the dynamic and static mixed flow to achieve cross-region heat transfer, so as to realize the overall cooling inside the storage tank, eliminate the temperature rise caused by supercritical transition, ensure the stability of liquid hydrogen supply, and extend the liquid hydrogen supply duration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of the liquid hydrogen supercritical supply system provided by an embodiment of the present invention.

[0022] Reference numerals:

[0023] 1 - Storage tank; 2 - First cavity; 3 - Second cavity; 4 - Partition; 5 - Second communication pipeline; 6 - Second communication valve; 7 - First communication pipeline; 8 - First communication valve; 9 - First exhaust pipeline; 10 - First exhaust valve; 11 - Second exhaust pipeline; 12 - Second exhaust valve; 13 - Boosting pipeline; 14 - First boosting valve; 15 - Second boosting valve; 16 - Filling and supply pipeline; 17 - First regulating valve; 18 - Second regulating valve; 19 - Liquid hydrogen filling valve; 20 - Liquid hydrogen supply valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] As Figure 1 shown, an embodiment of the present invention provides a liquid hydrogen supercritical supply system, including:

[0026] The storage tank 1 is internally provided with a partition plate 4. The partition plate 4 is used to divide the internal cavity of the storage tank 1 into a first cavity 2 and a second cavity 3. The first cavity 2 and the second cavity 3 are used to store the liquid hydrogen to be supplied. A communication component is arranged on the partition plate 4 for selectively communicating the first cavity 2 and the second cavity 3;

[0027] The pressurizing component is arranged at the top of the storage tank 1 and is respectively communicated with the first cavity 2 and the second cavity 3. The pressurizing component is used to introduce pressurized gas into the first cavity 2 and / or the second cavity 3;

[0028] The exhaust component is arranged at the top of the storage tank 1 and is respectively communicated with the first cavity 2 and the second cavity 3. The exhaust component is used to discharge the hydrogen medium above the first cavity 2 or the second cavity 3 out of the storage tank 1;

[0029] The supply component is arranged at the bottom of the storage tank 1 and is respectively communicated with the first cavity 2 and the second cavity 3. The supply component is used to supply liquid hydrogen to the external use end;

[0030] When the liquid hydrogen turns into supercritical hydrogen, control the pressurizing component to stop ventilating into the first cavity 2 or the second cavity 3, and control the exhaust component to exhaust the cavity that has closed ventilation to realize the pressure reduction and temperature reduction of the cavity; after the pressure reduction and temperature reduction are completed, close the exhaust of the cavity and control the pressurizing component to ventilate into the cavity until the pressures in the two cavities are equal, and open the communication component to realize the spontaneous mixing of the hydrogen medium in the first cavity 2 and the second cavity 3.

[0031] In this embodiment, by vertically dividing the storage tank 1 into two independent storage areas (i.e., the first cavity 2 and the second cavity 3), when the temperature of the liquid hydrogen rises due to the supercritical transition, any independent storage area can be exhaust-cooled. Subsequently, through the connection channels of the two storage areas (i.e., the communication component arranged on the partition plate 4), under the drive of the temperature difference and the dynamic and static mixing flow, a spontaneous flow cycle is carried out to realize the cross-region transmission of cold energy, so that the overall cooling inside the storage tank 1 can be realized, the temperature rise caused by the supercritical transition can be eliminated, the stability of the liquid hydrogen supply can be ensured, and the liquid hydrogen supply duration can be extended.

[0032] That is to say, the above technical solution divides the conventional storage tank into zones, and when the temperature of the liquid hydrogen rises too fast due to the supercritical transition, exhaust cooling is carried out on any one of the zones (i.e., the first cavity or the second cavity), which can effectively eliminate the adverse effects of the supercritical transition and ensure the stability of the liquid hydrogen supply.

[0033] The principle of reducing the pressure and temperature of the exhaust gas is specifically described as follows: Since the temperature and pressure of the pressurized gas are higher than the supercritical temperature and pressure of liquid hydrogen, a supercritical transformation will occur in the contact area between the pressurized gas and the liquid hydrogen inside the liquid hydrogen storage tank, that is, the liquid hydrogen will turn into supercritical hydrogen. Due to the disappearance of the gas-liquid phase change during the supercritical transformation process, the heat transfer rate of the pressurized gas will increase significantly, thereby affecting the subsequent supply duration. When the amount of liquid hydrogen inside the storage tank cannot meet the set supply time (for example, the supply time can be predicted by setting a prediction model. The input variables of the model can be the initial liquid hydrogen level in the storage tank, the supply flow rate of liquid hydrogen, and the pressure and temperature of the pressurized gas, and the output variable is the supply time of liquid hydrogen. This prediction model will not be elaborated here), an exhaust cooling operation can be performed at this time to eliminate the adverse effects caused by the supercritical transformation of liquid hydrogen. When exhausting the gas from the cavity, the pressure inside the cavity will drop rapidly. When the pressure value is lower than the supercritical pressure of liquid hydrogen, the supercritical hydrogen inside the cavity will disappear. At the same time, part of the supercritical hydrogen will first turn into non-equilibrium liquid hydrogen. Due to the continuous decrease in pressure, this part of the liquid hydrogen in the high saturation state will quickly vaporize, thereby generating cold energy, and thus the pressure reduction and temperature reduction of the exhaust gas are achieved. At this time, the gas-liquid two-phase state is restored in the cavity again. When the temperature of the liquid hydrogen at the interface of the liquid phase region is equal to the liquid hydrogen saturation temperature of 20.28K corresponding to the external atmospheric pressure, it indicates that the cavity has completely eliminated the influence brought by the supercritical transformation.

[0034] In addition, after the exhaust cooling is carried out, the heat transfer rate of the pressurized gas caused by the supercritical transformation is reduced to a certain extent. At this time, the supply time of the liquid hydrogen inside the storage tank can be extended to a certain extent. Therefore, the number of exhaust cooling operations can be determined according to the specific liquid hydrogen supply time. During the specific supply process, since a certain amount of hydrogen loss will occur during the exhaust cooling, the number of exhausts only needs to meet the overall supply requirements.

[0035] It should be noted that in this solution, it is not the case that when one partition is working (i.e., supplying liquid hydrogen), the other partition stops working. Instead, the two partitions can work simultaneously. However, this solution uses the cooling of one partition to achieve the cooling of the overall liquid hydrogen, which is crucial for some special working conditions. For example, during the variable working condition test process, the supply amount of liquid hydrogen needs to be adjusted, and the flow rate adjustment range is relatively large. The former can only achieve a flow rate adjustment of 0 - 50%, while the latter can achieve a flow rate adjustment of 0 - 100%. The essential reason for the difference is to achieve the cooling of the overall liquid hydrogen by using the connecting components set inside the storage tank.

[0036] In an embodiment of the present invention, the partition 4 is a metal partition with fins, so that the cold generated by cooling the supercritical hydrogen exhaust can be quickly transferred to the interior of the storage tank 1, accelerating the response speed of the system cooling. And when the temperature rise of the liquid hydrogen caused by the supercritical transition is small, only the exhaust cooling operation for a single storage area needs to be carried out, reducing the system operation complexity.

[0037] In some embodiments, the fins of the metal partition with fins can be high - thermal - conductivity copper fins, and extend to both sides of the first cavity 2 and the second cavity 3 respectively to further enhance the cooling effect.

[0038] In an embodiment of the present invention, the communication component includes a first communication pipeline 7 arranged on the top of the partition 4 and a second communication pipeline 5 arranged on the bottom of the partition 4. A first communication valve 8 is arranged on the first communication pipeline 7. The first communication pipeline 7 is respectively communicated with the first cavity 2 and the second cavity 3. A second communication valve 6 is arranged on the second communication pipeline 5. The second communication pipeline 5 is respectively communicated with the first cavity 2 and the second cavity 3.

[0039] In this embodiment, the first communication pipeline 7 can realize the circulation of the hydrogen medium (i.e., hydrogen and supercritical hydrogen) at the top of the liquid hydrogen storage tank, and the second communication pipeline 5 can realize the circulation of the hydrogen medium (i.e., liquid hydrogen) at the bottom of the liquid hydrogen storage tank. By setting the first communication valve 8 and the second communication valve 6, independent control and the spontaneous mixing of the hydrogen medium can be effectively realized.

[0040] In an embodiment of the present invention, the pressurization component includes a first pressurization pipeline communicated with the first cavity 2 and a second pressurization pipeline communicated with the second cavity 3 ( Figure 1 represented by the pressurization pipeline 13 in the figure), a first pressurization valve 14 is arranged on the first pressurization pipeline, and a second pressurization valve 15 is arranged on the second pressurization pipeline.

[0041] In this embodiment, the first pressurization pipeline can achieve the effect of pressurizing the first cavity 2, and the second pressurization pipeline can achieve the effect of pressurizing the second cavity 3.

[0042] In an embodiment of the present invention, the exhaust component includes a first exhaust pipeline 9 communicated with the first cavity 2 and a second exhaust pipeline 11 communicated with the second cavity 3. A first exhaust valve 10 is arranged on the first exhaust pipeline 9, and a second exhaust valve 12 is arranged on the second exhaust pipeline 11.

[0043] In this embodiment, the first exhaust pipeline 9 can exhaust and cool the first cavity 2, the second exhaust pipeline 11 can exhaust and cool the second cavity 3, and both the first exhaust pipeline 9 and the second exhaust pipeline 11 are connected to the hydrogen discharge pipe.

[0044] In an embodiment of the present invention, the supply assembly includes a first supply pipeline communicating with the first cavity 2 and a second supply pipeline communicating with the second cavity 3. A first regulating valve 17 is provided on the first supply pipeline, and a second regulating valve 18 is provided on the second supply pipeline.

[0045] In an embodiment of the present invention, it further includes a filling supply pipeline 16. A liquid hydrogen filling valve 19 and a liquid hydrogen supply valve 20 are provided on the filling supply pipeline 16. The filling supply pipeline 16 is respectively communicated with the first supply pipeline and the second supply pipeline.

[0046] In an embodiment of the present invention, the volumes of the first cavity 2 and the second cavity 3 are the same.

[0047] In this embodiment, by ensuring that the volumes of the first cavity 2 and the second cavity 3 are the same, thus by adjusting the first regulating valve 17 and the second regulating valve 18 to specific opening degrees (for example, gradually adjusting the opening degree of the first regulating valve 17 from 50% to 0%, gradually adjusting the opening degree of the second regulating valve 18 from 50% to 100%, or gradually adjusting the opening degree of the first regulating valve 17 from 0% to 50%, gradually adjusting the opening degree of the second regulating valve 18 from 100% to 50% as described below), the liquid hydrogen supply flow rate can be maintained at a set value, improving the stability of the system.

[0048] In an embodiment of the present invention, the pressurizing gas uses hydrogen or helium with a temperature higher than 33.145 K and a pressure higher than 1.5 MPa.

[0049] In some embodiments, heat insulation materials are provided on the exteriors of components such as the storage tank 1 and the filling supply pipeline 16 to prevent heat leakage.

[0050] In addition, an embodiment of the present invention further provides a method for supercritical supply of liquid hydrogen, which is applied to the system mentioned in any of the above embodiments, including:

[0051] Step S1, liquid hydrogen filling stage: Open the first exhaust valve 10, the second exhaust valve 12, the liquid hydrogen filling valve 19, the first communication valve 8 and the second communication valve 6. Adjust the opening degrees of the first regulating valve 17 and the second regulating valve 18 to the fully open state. Supply the external liquid hydrogen to the first cavity 2 and the second cavity 3 through the first supply pipeline and the second supply pipeline respectively. When the liquid level heights of the first cavity 2 and the second cavity 3 reach the preset heights, stop filling the liquid hydrogen, close the liquid hydrogen filling valve 19, and adjust the opening degrees of the first regulating valve 17 and the second regulating valve 18 to the fully closed state;

[0052] Step S2, liquid hydrogen supply stage: Close the first exhaust valve 10 and the second exhaust valve 12, open the first booster valve 14, the second booster valve 15 and the liquid hydrogen supply valve 20, adjust the opening degrees of the first regulating valve 17 and the second regulating valve 18 to 50%, and introduce the external booster gas into the first cavity 2 and the second cavity 3 through the first booster pipeline and the second booster pipeline respectively, so that the liquid hydrogen in the first cavity 2 and the second cavity 3 is supplied to the external usage end through the liquid hydrogen supply valve 20;

[0053] Step S3, exhaust cooling stage: It includes an exhaust cooling stage for the first cavity 2 and an exhaust cooling stage for the second cavity 3, where:

[0054] The exhaust cooling stage for the first cavity 2 includes: Close the first communication valve 8 and the second communication valve 6, gradually adjust the opening degree of the first regulating valve 17 from 50% to 0%, gradually adjust the opening degree of the second regulating valve 18 from 50% to 100%, close the first booster valve 14, open the first exhaust valve 10, and when the internal pressure of the first cavity 2 is equal to the atmospheric pressure, close the first exhaust valve 10; Open the first booster valve 14 to boost the pressure of the first cavity 2, and when the internal pressures of the first cavity 2 and the second cavity 3 are equal, open the first communication valve 8 and the second communication valve 6 to realize the spontaneous mixing of the hydrogen medium in the first cavity 2 and the second cavity 3, thereby reducing the temperature of the liquid hydrogen in the second cavity 3; Gradually adjust the opening degree of the first regulating valve 17 from 0% to 50%, gradually adjust the opening degree of the second regulating valve 18 from 100% to 50%, and resume normal liquid supply;

[0055] The exhaust cooling stage for the second cavity 3 includes: Close the first communication valve 8 and the second communication valve 6, gradually adjust the opening degree of the second regulating valve 18 from 50% to 0%, gradually adjust the opening degree of the first regulating valve 17 from 50% to 100%, close the second booster valve 15, open the second exhaust valve 12, and when the internal pressure of the second cavity 3 is equal to the atmospheric pressure, close the second exhaust valve 12; Open the second booster valve 15 to boost the pressure of the second cavity 3, and when the internal pressures of the second cavity 3 and the first cavity 2 are equal, open the first communication valve 8 and the second communication valve 6 to realize the spontaneous mixing of the hydrogen medium in the first cavity 2 and the second cavity 3, thereby reducing the temperature of the liquid hydrogen in the first cavity 2; Gradually adjust the opening degree of the second regulating valve 18 from 0% to 50%, gradually adjust the opening degree of the first regulating valve 17 from 100% to 50%, and resume normal liquid supply.

[0056] It can be understood that the method embodiment and the system embodiment provided by the present invention are based on the same inventive concept, and they have the same beneficial effects. Therefore, the beneficial effects of the method embodiment will not be elaborated here.

[0057] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising said element.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid hydrogen supercritical supply system, characterized in that: include: A storage tank, wherein a partition is provided inside, the partition is used to divide the internal cavity of the storage tank into a first cavity and a second cavity, the first cavity and the second cavity are used to store liquid hydrogen to be supplied, and the partition is provided with a connecting component for selectively connecting the first cavity and the second cavity; A booster assembly, disposed at the top of the storage tank and connected to the first cavity and the second cavity respectively, and the booster assembly is used to pass pressurized gas into the first cavity and / or the second cavity; An exhaust component is disposed on the top of the storage tank and is connected to the first cavity and the second cavity respectively, and the exhaust component is used to discharge the hydrogen medium above the first cavity or the second cavity out of the storage tank; A supply assembly is disposed at the bottom of the storage tank and is communicated with the first cavity and the second cavity respectively, and the supply assembly is used to supply liquid hydrogen to an external user end; When the liquid hydrogen is converted into supercritical hydrogen, the boost component is controlled to stop venting to the first cavity or the second cavity, and the exhaust component is controlled to exhaust the cavity whose ventilation has been closed, so as to achieve pressure reduction and temperature reduction of the cavity; after the pressure reduction and temperature reduction are completed, the exhaust of the cavity is closed and the boost component is controlled to vent to the cavity until the pressures in the two cavities are equal, and the connecting component is opened to achieve spontaneous mixing of the hydrogen medium in the first cavity and the second cavity.

2. The system according to claim 1, characterized in that The partition is a metal partition with fins.

3. The system according to claim 2, characterized in that The connecting component includes a first connecting pipeline arranged at the top of the partition and a second connecting pipeline arranged at the bottom of the partition, the first connecting pipeline is provided with a first connecting valve, the first connecting pipeline is respectively connected to the first cavity and the second cavity, the second connecting pipeline is provided with a second connecting valve, the second connecting pipeline is respectively connected to the first cavity and the second cavity.

4. The system according to claim 3, characterized in that The boost assembly includes a first boost pipeline communicating with the first cavity and a second boost pipeline communicating with the second cavity. A first boost valve is disposed on the first boost pipeline, and a second boost valve is disposed on the second boost pipeline.

5. The system according to claim 4, characterized in that The exhaust assembly includes a first exhaust pipeline communicating with the first cavity and a second exhaust pipeline communicating with the second cavity. A first exhaust valve is disposed on the first exhaust pipeline, and a second exhaust valve is disposed on the second exhaust pipeline.

6. The system according to claim 5, characterized in that The supply assembly includes a first supply pipeline communicating with the first cavity and a second supply pipeline communicating with the second cavity. A first regulating valve is disposed on the first supply pipeline, and a second regulating valve is disposed on the second supply pipeline.

7. The system according to claim 6, characterized in that It also includes a filling supply pipeline, on which a liquid hydrogen filling valve and a liquid hydrogen supply valve are arranged, and the filling supply pipeline is connected to the first supply pipeline and the second supply pipeline respectively.

8. The system according to claim 6, characterized in that The first cavity and the second cavity have the same volume.

9. The system according to claim 8, characterized in that The pressurized gas is hydrogen or helium with a temperature higher than 33.145K and a pressure higher than 1.5MPa.

10. A method for supplying supercritical liquid hydrogen, characterized in that: The system as claimed in claim 9, comprising: Step S1, liquid hydrogen filling stage: open the first exhaust valve, the second exhaust valve, the liquid hydrogen filling valve, the first connecting valve and the second connecting valve, adjust the openings of the first regulating valve and the second regulating valve to a fully open state, supply external liquid hydrogen to the first cavity and the second cavity through the first supply pipeline and the second supply pipeline respectively, and when the liquid level heights of the first cavity and the second cavity reach a preset height, stop filling with liquid hydrogen, close the liquid hydrogen filling valve, and adjust the openings of the first regulating valve and the second regulating valve to a fully closed state; Step S2, liquid hydrogen supply stage: close the first exhaust valve and the second exhaust valve, open the first boost valve, the second boost valve and the liquid hydrogen supply valve, adjust the opening of the first regulating valve and the second regulating valve to 50%, and pass the external pressurized gas into the first cavity and the second cavity through the first boost pipeline and the second boost pipeline respectively, so that the liquid hydrogen in the first cavity and the second cavity is supplied to the external use end through the liquid hydrogen supply valve; Step S3, exhaust cooling stage: including the exhaust cooling stage for the first cavity and the exhaust cooling stage for the second cavity, wherein: The exhaust temperature reduction stage for the first cavity includes: closing the first connecting valve and the second connecting valve, gradually adjusting the opening of the first regulating valve from 50% to 0%, gradually adjusting the opening of the second regulating valve from 50% to 100%, closing the first boosting valve, opening the first exhaust valve, and when the internal pressure of the first cavity is equal to the atmospheric pressure, closing the first exhaust valve; opening the first boosting valve to pressurize the first cavity, and when the internal pressures of the first cavity and the second cavity are equal, opening the first connecting valve and the second connecting valve to achieve spontaneous mixing of hydrogen media in the first cavity and the second cavity, thereby reducing the temperature of liquid hydrogen in the second cavity; gradually adjusting the opening of the first regulating valve from 0% to 50%, and gradually adjusting the opening of the second regulating valve from 100% to 50%, and resuming normal liquid supply; The exhaust temperature reduction stage for the second cavity includes: closing the first connecting valve and the second connecting valve, gradually adjusting the opening of the second regulating valve from 50% to 0%, gradually adjusting the opening of the first regulating valve from 50% to 100%, closing the second boost valve, opening the second exhaust valve, and when the internal pressure of the second cavity is equal to the atmospheric pressure, closing the second exhaust valve; opening the second boost valve to pressurize the second cavity, and when the internal pressure of the second cavity is equal to the internal pressure of the first cavity, opening the first connecting valve and the second connecting valve to achieve spontaneous mixing of hydrogen media in the first cavity and the second cavity, thereby reducing the temperature of liquid hydrogen in the first cavity; gradually adjusting the opening of the second regulating valve from 0% to 50%, and gradually adjusting the opening of the first regulating valve from 100% to 50%, and resuming normal liquid supply.

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