Liquid hydrogen supply system and vehicle

Abstract

The application relates to the technical field of hydrogen energy application, and provides a liquid hydrogen gas supply system and a vehicle. The liquid hydrogen gas supply system comprises a hydrogen storage bottle, and a centralized discharge pipeline in communication with the hydrogen storage bottle; the centralized discharge pipeline can communicate a gas phase space in the hydrogen storage bottle with a hydrogen catalysis system, and a first control part is arranged on the centralized discharge pipeline; the first control part is used for controlling the on-off of fluid in the centralized discharge pipeline. The liquid hydrogen gas supply system disclosed by the application can discharge hydrogen in the gas phase space in the hydrogen storage bottle to the hydrogen catalysis system by adding the centralized discharge pipeline, can reduce external leakage of hydrogen, is beneficial to energy saving, facilitates hydrogen use of the hydrogen catalysis system, and can better reduce the risk of security hidden danger.

Description

Technical Field

[0001] This application relates to the field of hydrogen energy application technology, and in particular to a liquid hydrogen supply system. This application also relates to a vehicle using this liquid hydrogen supply system. Background Technology

[0002] The liquid hydrogen supply system is a hydrogen energy supply solution based on cryogenic liquid hydrogen storage technology. It achieves high energy density and long-lasting hydrogen energy utilization by liquefying hydrogen and storing it in hydrogen storage cylinders.

[0003] In existing liquid hydrogen supply systems, hydrogen is typically released directly through the safety valve after it reaches the discharge pressure, resulting in a large amount of hydrogen leakage. This not only wastes hydrogen but also poses significant safety hazards. Utility Model Content

[0004] In view of this, this application aims to propose a liquid hydrogen supply system that can reduce hydrogen emissions and thus reduce the risk of safety hazards.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A liquid hydrogen supply system includes a hydrogen storage cylinder and a centralized discharge pipeline connected to the hydrogen storage cylinder; The centralized discharge pipeline can connect the gas phase space inside the hydrogen storage cylinder and the hydrogen catalytic system, and a first control unit is provided on the centralized discharge pipeline. The first control unit is used to control the flow of fluid in the centralized discharge pipeline.

[0006] Furthermore, the first control unit includes a first shut-off valve and a pressure relief valve arranged sequentially along the fluid flow direction within the centralized discharge pipeline.

[0007] Furthermore, it also includes a liquid hydrogen filling pipeline and a pressure relief pipeline connected to the hydrogen storage cylinder; The pressure relief pipeline includes a first pressure relief pipeline that connects the hydrogen storage cylinder and the centralized discharge device, and a second pressure relief pipeline that connects the liquid hydrogen filling pipeline and the centralized discharge device. Both the first pressure relief pipeline and the second pressure relief pipeline are equipped with safety valves, and the safety threshold of the safety valve on the first pressure relief pipeline is lower than the safety threshold of the safety valve on the second pressure relief pipeline.

[0008] Furthermore, it also includes a return gas pipeline, which connects the hydrogen storage cylinder and the return gas port, and a second shut-off valve is provided on the return gas pipeline. Furthermore, it also includes a hydrogen supply pipeline that connects the liquid phase space inside the hydrogen storage cylinder to the fuel cell system, and a pressurization pipeline that can pressurize the hydrogen storage cylinder. The pressurization pipeline includes a heating tube located inside the hydrogen storage cylinder, with both ends of the heating tube connected to the upstream and downstream of the vaporizer in the hydrogen supply pipeline, respectively. The hydrogen supply pipeline is equipped with a second control unit, which is capable of controlling the flow rate of the fluid flowing through the hydrogen supply pipeline.

[0009] Furthermore, the second control unit includes a proportional valve disposed on the hydrogen supply pipeline; Along the flow direction of the fluid in the hydrogen supply pipeline, the proportional valve is located downstream of the vaporizer and upstream of the buffer tank in the hydrogen supply pipeline.

[0010] Furthermore, the vaporizer is provided with a first heat exchange tube and a second heat exchange tube; The first heat exchange tube is connected in series with the hydrogen supply pipeline; One end of the heating tube is connected to the section between the first heat exchange tube and the proportional valve in the hydrogen supply pipeline via a pressurized gas inlet pipe. The other end of the heating tube is connected to one end of the second heat exchange tube via a first pressurized gas outlet pipe. The other end of the second heat exchange tube is connected to the downstream of the proportional valve via a second pressurized gas outlet pipe.

[0011] Furthermore, along the flow direction of the fluid within the booster intake pipe, a first solenoid valve and a third shut-off valve are sequentially installed on the booster intake pipe; and / or, The second pressurized outlet pipe is equipped with a third check valve, which can control the flow of fluid in the second heat exchange pipe to the hydrogen supply pipe.

[0012] Furthermore, it also includes a connecting pipeline, on which an economy valve is provided; Upstream of the vaporizer, along the fluid flow direction in the hydrogen supply pipeline, a first check valve, a fourth shut-off valve, and an overflow valve are sequentially provided. One end of the connecting pipe is connected to the gas phase space inside the hydrogen storage cylinder, and the other end is connected to the hydrogen supply pipe. The connection point between the connecting pipe and the hydrogen supply pipe is located downstream of the first check valve and upstream of the fourth shut-off valve.

[0013] Compared with related technologies, this application has the following advantages: (1) The liquid hydrogen supply system described in this application, by adding a centralized discharge pipeline, allows the hydrogen in the gas phase space inside the hydrogen storage cylinder to be discharged to the hydrogen catalytic system, which facilitates the use of hydrogen in the hydrogen catalytic system, reduces external leakage of hydrogen, helps save energy, and at the same time can better reduce the risk of safety hazards.

[0014] (2) The first control unit includes a first shut-off valve and a pressure relief valve. The first shut-off valve is an active control element that can completely cut off or open the centralized discharge pipeline. Its core function is to control the start and stop of hydrogen discharge as needed. The pressure relief valve is a passive safety device that automatically opens when the pressure in the pipeline exceeds the preset threshold to release excess hydrogen to prevent pipeline overpressure damage. Its action does not require manual intervention and is a line of defense for system pressure safety.

[0015] (3) The pressure relief pipeline includes a first pressure relief pipeline and a second pressure relief pipeline. The safety threshold of the safety valve on the first pressure relief pipeline is less than that on the second pressure relief pipeline. The first pressure relief pipeline, as a primary protection, can release a small amount of hydrogen to stabilize the system pressure and prevent the pressure from accumulating. The second pressure relief pipeline, as a secondary protection, can quickly discharge a large amount of hydrogen to prevent the pipeline or equipment from rupturing due to overpressure, which could lead to hydrogen leakage or explosion. The two pressure relief pipelines work together to cover the safety pressure range requirements, thereby ensuring the safety of the system.

[0016] (4) When the pressure inside the hydrogen storage cylinder increases, such as during the liquid hydrogen filling process, the hydraulic gas supply system can release part of the pressure through the return gas pipeline, thereby increasing the hydrogen storage capacity of the hydrogen storage cylinder.

[0017] (5) The pressurization pipeline can be opened by the second control unit when the pressure inside the hydrogen storage bottle is low, so that the heating tube can heat the hydrogen stored in the hydrogen storage bottle, which can increase the pressure inside the hydrogen storage bottle and facilitate the smooth discharge of hydrogen from the hydrogen storage bottle for use.

[0018] (6) The second control unit adopts a proportional valve, which can continuously adjust the opening degree to facilitate the adjustment of the hydrogen flow direction. When the pressure in the hydrogen storage bottle needs to be increased, the flow rate in the hydrogen supply pipeline can be appropriately reduced and the flow rate in the pressurization pipeline can be increased, so that the air flow in the pressurization pipeline can exchange heat with the hydrogen stored in the hydrogen storage bottle through the heating tube, thereby increasing the pressure in the hydrogen storage bottle.

[0019] (7) A first heat exchange tube and a second heat exchange tube are installed in the gasifier at the same time, and the first heat exchange tube is connected in series in the hydrogen supply pipeline and the second heat exchange tube is connected in series in the pressurization pipeline, so as to facilitate the connection and arrangement of the pipeline.

[0020] (8) A first solenoid valve and a third shut-off valve are installed on the booster intake pipe. The first solenoid valve is used to quickly cut off or open the booster gas supply, and the third shut-off valve can be manually closed to cut off the booster gas supply, which can improve the reliability of the booster intake pipe cut-off.

[0021] (9) Set up connecting pipelines and economic valves. By opening the economic valves, the air in the gas phase space of the hydrogen storage cylinder can be used preferentially, which helps to improve the economy of gas use.

[0022] Another object of this application is to provide a vehicle equipped with a liquid hydrogen supply system as described above.

[0023] To achieve the above objectives, the technical solution of this application is implemented as follows: The vehicle described in this application, by applying the liquid hydrogen supply system described above, can reduce hydrogen emissions, improve the economy of hydrogen use, and reduce the risk of safety hazards. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an exemplary structural diagram of the liquid hydrogen supply system described in an embodiment of this application; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 for Figure 1 A structural diagram from another perspective.

[0025] Explanation of reference numerals in the attached figures: 1. Hydrogen storage cylinder; 2. Centralized emission pipeline; 3. Hydrogen catalytic system; 4. Liquid hydrogen refueling pipeline; 5. First pressure relief pipeline; 6. Second pressure relief pipeline; 7. Return gas pipeline; 8. Centralized emission device; 9. Hydrogen supply pipeline; 10. Pressurization pipeline; 11. Connecting pipeline; 12. Pressure sensor; 13. Pressure transmitter; 14. Liquid level sensor; 15. Flame detector; 16. Gas detector; 17. Audible and visual alarm; 18. Gas alarm control system; 19. Temperature transmitter; 201. First control unit; 2011. First shut-off valve; 2012. Pressure relief valve; 401, Second check valve; 501, First safety valve; 601, Second safety valve; 701, Second shut-off valve; 901. Vaporizer; 902. Buffer tank; 903. Fourth shut-off valve; 904. Overflow valve; 905. Pressure regulating valve; 906. Second solenoid valve; 907. Second control unit; 908. First check valve; 9011, First heat exchange tube; 9012, Second heat exchange tube; 1001, Boost intake pipe; 1002, Heating pipe; 1003, First boost exhaust pipe; 1004, Second boost exhaust pipe; 10011, First solenoid valve; 10012, Third shut-off valve; 10041, Third check valve; 1101, Economic Valve; a. Air return port; b. Filling port. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] An embodiment of the first aspect of this application provides a liquid hydrogen supply system that, by improving the system structure, can reduce hydrogen emissions, thereby reducing the risk of safety hazards.

[0033] In related technologies, the hydrogen energy industry chain is divided into three aspects: upstream hydrogen production, midstream hydrogen storage and transportation, and downstream hydrogen energy application. Liquid hydrogen, as a form of hydrogen, has a larger storage capacity than gaseous hydrogen. Liquid hydrogen supply systems can store liquid hydrogen and vaporize it to supply hydrogen-using equipment such as fuel cells or internal combustion engines.

[0034] Onboard liquid hydrogen supply systems are one of the core technologies in the field of hydrogen energy transportation. They primarily address the high-density hydrogen fuel storage requirements of hydrogen fuel cells, and can be applied to long-range scenarios such as automobiles, heavy trucks, ships, and aviation. Ultra-low temperature storage, lightweighting, and zero-evaporation loss technologies for hydrogen will significantly improve vehicle range and safety performance.

[0035] In existing liquid hydrogen supply systems, hydrogen is directly discharged through the safety valve after it reaches the discharge pressure, resulting in a large amount of hydrogen leakage. This not only wastes hydrogen but also poses a significant safety hazard.

[0036] In view of this, in order to overcome the shortcomings of hydrogen waste in related technologies, the liquid hydrogen supply system of this embodiment combines... Figures 1 to 3 As shown, the overall design includes a hydrogen storage cylinder 1 and a centralized discharge pipeline 2 connected to the hydrogen storage cylinder 1.

[0037] Based on the above general introduction, specifically, the centralized emission pipeline 2 can connect the gas phase space inside the hydrogen storage cylinder 1 and the hydrogen catalytic system 3, and a first control unit 201 is provided on the centralized emission pipeline 2. The first control unit 201 is used to control the flow of fluid in the centralized emission pipeline 2.

[0038] The liquid hydrogen supply system described in this application, by adding a centralized discharge pipeline 2, allows hydrogen in the gas phase space inside the hydrogen storage cylinder 1 to be discharged to the hydrogen catalytic system 3 when the centralized discharge pipeline 2 is connected under the control of the first control unit 201. This facilitates the use of hydrogen by the hydrogen catalytic system 3, reduces external leakage of hydrogen, helps save energy, and also reduces the risk of safety hazards.

[0039] When the centralized emission pipeline 2 is disconnected by the first control unit 201, the hydrogen in the gas phase space inside the hydrogen storage cylinder 1 cannot be emitted to the hydrogen catalytic system 3, and it does not affect the normal use of hydrogen by hydrogen-using equipment such as fuel cell systems.

[0040] Continue to combine Figures 1 to 3 As shown, in some preferred embodiments, the first control unit 201 includes a first shut-off valve 2011 and a pressure relief valve 2012 arranged sequentially along the fluid flow direction in the centralized discharge pipeline 2.

[0041] It should be noted that the first shut-off valve 2011 can be, for example, a Stop Valve or a Globe Valve. The pressure relief valve 2012 can also be called a PRV control valve, short for Pressure Relief Valve.

[0042] Here, the first control unit 201 includes a first shut-off valve 2011 and a pressure relief valve 2012. The first shut-off valve 2011 is an active control element that can completely cut off or open the centralized discharge pipeline 2. Its core function is to control the start and stop of hydrogen discharge as needed. The pressure relief valve 2012 is a passive safety device that automatically opens when the pressure in the pipeline exceeds a preset threshold to release excess hydrogen to prevent pipeline overpressure damage. Its operation does not require manual intervention and is a line of defense for system pressure safety.

[0043] In some preferred embodiments, the liquid hydrogen supply system of this embodiment further includes a liquid hydrogen filling pipeline 4 and a pressure relief pipeline connected to the hydrogen storage cylinder 1. The pressure relief pipeline includes a first pressure relief pipeline 5 that connects the hydrogen storage cylinder 1 and the centralized emission device 8, and a second pressure relief pipeline 6 that connects the liquid hydrogen filling pipeline 4 and the centralized emission device 8. Both the first pressure relief pipeline 5 and the second pressure relief pipeline 6 are equipped with safety valves. The safety threshold of the safety valve on the first pressure relief pipeline 5 is lower than the safety threshold of the safety valve on the second pressure relief pipeline 6.

[0044] In detail, still refer to Figures 1 to 3 As shown, one end of the liquid hydrogen refueling line 4 is connected to the hydrogen storage cylinder 1, for example, to the aforementioned gas phase space, and the other end is connected to the refueling port b. To prevent fluid diversion, a second check valve 401 is provided on the liquid hydrogen refueling line 4. The second check valve 401 allows the fluid flowing into the liquid hydrogen refueling line 4 from the refueling port b to flow unidirectionally towards the hydrogen storage cylinder 1, but the fluid in the liquid hydrogen refueling line 4 cannot flow in the reverse direction. It should be noted that the liquid hydrogen refueling line 4 is a vacuum line, and the second check valve 401 can use an existing structure.

[0045] The first pressure relief line 5 connects to the hydrogen storage cylinder 1. Its main purpose is to connect to the gas phase space inside the hydrogen storage cylinder 1. For example, during the liquid hydrogen filling process, the pressure inside the hydrogen storage cylinder 1 increases, and the gaseous hydrogen in the gas phase space can be discharged to the centralized discharge device 8 through the first pressure relief line 5, which facilitates increasing the liquid hydrogen storage space inside the hydrogen storage cylinder 1, thereby increasing the hydrogen storage capacity of the hydrogen storage cylinder 1.

[0046] One end of the second pressure relief line 6 is connected to the liquid hydrogen filling line 4, with the connection point located downstream of the second check valve 401. The other end of the second pressure relief line 6 is connected to the centralized discharge device 8. In one example, the other end of the second pressure relief line 6 is connected to the first pressure relief line 5, allowing the second pressure relief line 6 to connect to the centralized discharge device 8. It should be noted that the connection point between the second pressure relief line 6 and the first pressure relief line 5 is located downstream of the safety valve on the first pressure relief line 5. This configuration allows for the release of some pressure through the second pressure relief line 6 during liquid hydrogen filling if the filling pressure is high, thus ensuring the safety and reliability of the liquid hydrogen supply system.

[0047] In the above structure, the pressure relief pipeline includes a first pressure relief pipeline 5 and a second pressure relief pipeline 6. The safety threshold of the safety valve on the first pressure relief pipeline 5 is lower than the safety threshold of the safety valve on the second pressure relief pipeline 6. The first pressure relief pipeline 5 serves as primary protection, releasing a small amount of hydrogen to stabilize the system pressure and prevent continuous pressure accumulation. The second pressure relief pipeline 6 serves as secondary protection, rapidly discharging a large amount of hydrogen to prevent pipelines or equipment from rupturing due to overpressure, which could lead to hydrogen leakage or explosion. The two-stage pressure relief pipelines work together to cover the required safe pressure range, thereby ensuring system safety.

[0048] For ease of description, the safety valve on the first pressure relief line 5 is referred to as the first safety valve 501, and the safety valve on the second pressure relief line 6 is referred to as the second safety valve 601. The safety threshold of the first safety valve 501 is lower than the safety threshold of the second safety valve 601. Both the first safety valve 501 and the second safety valve 601 can use existing structures.

[0049] It should also be noted that the safety threshold of the pressure relief valve 2012 is between the safety threshold of the first safety valve 501 and the safety threshold of the second safety valve 601. When the pressure in the hydrogen storage cylinder 1 is higher than the safety threshold of the first safety valve 501 but lower than the safety threshold of the second safety valve 601, the first shut-off valve 2011 and the pressure relief valve 2012 are opened. The centralized discharge pipeline 2 can be used to pre-discharge hydrogen to the hydrogen catalytic system 3, reduce external hydrogen leakage, and improve the safety of the liquid hydrogen supply system.

[0050] In some preferred embodiments, the liquid hydrogen supply system of this embodiment further includes a return gas pipeline 7, which connects the hydrogen storage cylinder 1 and the return gas port a, and is equipped with a second shut-off valve 701. With this return gas pipeline 7, when the pressure inside the hydrogen storage cylinder 1 increases, such as during liquid hydrogen refueling, the hydraulic supply system can release some pressure through the return gas pipeline 7, preventing the hydrogen storage cylinder 1 from becoming too high to refuel, and thus increasing the hydrogen storage capacity of the hydrogen storage cylinder 1.

[0051] In one example, the return gas line 7 is connected to the gas phase space inside the hydrogen storage cylinder 1, allowing for faster pressure release when the hydrogen storage cylinder 1 needs to be depressurized through the return gas line 7. The structure of the second shut-off valve 701 is the same as that of the first shut-off valve 2011, as described above.

[0052] To simplify the system structure, in one example, the return gas line 7, the first pressure relief line 5, and the centralized discharge line 2 are connected in parallel to one end of the hydrogen storage cylinder 1, which facilitates the connection and arrangement of the lines and allows for easy communication with the gas phase space inside the hydrogen storage cylinder 1.

[0053] In some preferred embodiments, the liquid hydrogen supply system of this embodiment further includes a hydrogen supply pipeline 9 that connects the liquid phase space inside the hydrogen storage cylinder 1 to the fuel cell system, and a pressurization pipeline 10 that can pressurize the hydrogen storage cylinder 1.

[0054] In detail, the pressurization pipeline 10 includes a heating tube 1002 located inside the hydrogen storage cylinder 1. The two ends of the heating tube 1002 are connected to the upstream and downstream of the vaporizer 901 in the hydrogen supply pipeline 9, respectively. The hydrogen supply pipeline 9 is provided with a second control unit 907, which can control the flow rate of the fluid flowing through the hydrogen supply pipeline 9.

[0055] It should be noted that, in a preferred example, in order to ensure a safe and reliable gas supply, along the flow direction of the fluid in the hydrogen supply pipeline 9, that is, the direction from the hydrogen storage cylinder 1 to the fuel cell system, the hydrogen supply pipeline 9 is sequentially equipped with a first check valve 908, a fourth shut-off valve 903, an overflow valve 904, a vaporizer 901, a second control unit 907, a buffer tank 902, a pressure regulating valve 905, and a second solenoid valve 906.

[0056] In one preferred embodiment, the vaporizer 901 uses an existing water bath vaporizer. The pressure regulating valve 905 is also known as a pressure regulating valve.

[0057] To better understand the liquid hydrogen supply system of this embodiment, it should be noted that the water bath vaporizer is a device that indirectly heats a cryogenic liquid gas (such as liquid hydrogen) with hot water to achieve vaporization. Its core function is to convert liquid gas into gas, while providing a stable gas supply and temperature control. Therefore, for ease of description, the hydrogen supply pipeline 9 upstream of the water bath vaporizer can be referred to as the liquid supply pipeline, and the hydrogen supply pipeline 9 downstream of the water bath vaporizer can be referred to as the gas supply pipeline.

[0058] In the above structure, the pressurization pipeline 10 can be adjusted by the second control unit 907 when the pressure in the hydrogen storage cylinder 1 is low or insufficient, so that the heating tube 1002 can heat the hydrogen stored in the hydrogen storage cylinder 1, which can increase the pressure in the hydrogen storage cylinder 1, so that the hydrogen in the hydrogen storage cylinder 1 can be smoothly discharged and used. Moreover, this process does not affect the vaporizer 901, the pressure fluctuation is small, and pressurization can be carried out at any time.

[0059] In some preferred embodiments, the second control unit 907 includes a proportional valve disposed on the hydrogen supply line 9. As can be seen from the foregoing description, the proportional valve is located downstream of the vaporizer 901 along the flow direction of the fluid in the hydrogen supply line 9, and upstream of the buffer tank 902 in the hydrogen supply line 9.

[0060] In the above structure, the second control unit 907 adopts a proportional valve, which can continuously adjust the opening degree to facilitate the adjustment of the hydrogen flow direction. When the pressure in the hydrogen storage cylinder 1 needs to be increased, the gas flow rate in the hydrogen supply pipeline 9 can be appropriately reduced by adjusting the proportional valve. This can increase the gas flow rate in the pressurization pipeline 10, so that the gas flow in the pressurization pipeline 10 can exchange heat with the hydrogen stored in the hydrogen storage cylinder 1 through the heating tube 1002, thereby increasing the pressure in the hydrogen storage cylinder 1.

[0061] In some preferred embodiments, the vaporizer 901 is provided with a first heat exchange tube 9011 and a second heat exchange tube 9012. The first heat exchange tube 9011 is connected in series in the hydrogen supply line 9. One end of the heating tube 1002 is connected to the part between the first heat exchange tube 9011 and the proportional valve in the hydrogen supply line 9 through the booster inlet pipe 1001. The other end of the heating tube 1002 is connected to one end of the second heat exchange tube 9012 through the first booster outlet pipe 1003. The other end of the second heat exchange tube 9012 is connected to the downstream of the proportional valve through the second booster outlet pipe 1004.

[0062] It should be noted that the connection point between the second pressurized outlet pipe 1004 and the hydrogen supply pipe 9 is preferably located upstream of the buffer tank 902 to better ensure hydrogen safety. A first heat exchange pipe 9011 and a second heat exchange pipe 9012 are simultaneously installed within the vaporizer 901, with the first heat exchange pipe 9011 connected in series in the hydrogen supply pipe 9 and the second heat exchange pipe 9012 connected in series in the pressurized pipe 10, facilitating pipe connection and arrangement.

[0063] In one example, the liquid hydrogen supply system of this embodiment further includes a temperature transmitter 19, which is connected to the hydrogen supply pipeline 9. The connection point is located downstream of the first heat exchange tube 9011 and upstream of the proportional valve, so as to monitor the temperature of the gas flow from the vaporizer 901.

[0064] In some preferred embodiments, a first solenoid valve 10011 and a third shut-off valve 10012 are sequentially provided on the booster intake pipe 1001 along the flow direction of the fluid within the pipe. The first solenoid valve 10011 is used to quickly cut off or open the supply of boosted gas, while the third shut-off valve 10012 can be manually closed to cut off the supply of boosted gas, thus improving the reliability of the shut-off function of the booster intake pipe 1001.

[0065] In some examples, a third check valve 10041 is provided on the second pressurized outlet pipe 1004. The third check valve 10041 can control the fluid in the second heat exchange tube 9012 to flow unidirectionally to the hydrogen supply pipe 9 and prevent fluid backflow.

[0066] Continue to refer to Figures 1 to 3 As shown, in some preferred embodiments, the liquid hydrogen supply system of this embodiment further includes a connecting pipe 11, on which an economic valve 1101 is provided.

[0067] For example, in a preferred embodiment, upstream of the vaporizer 901, a first check valve 908, a fourth shut-off valve 903, and an overflow valve 904 are sequentially arranged along the fluid flow direction in the hydrogen supply pipeline 9. One end of the connecting pipeline 11 is connected to the gas phase space in the hydrogen storage cylinder 1, and the other end is connected to the hydrogen supply pipeline 9. The connection point between the connecting pipeline 11 and the hydrogen supply pipeline 9 is located downstream of the first check valve 908 and upstream of the fourth shut-off valve 903.

[0068] A connecting pipe 11 is installed here, and an economy valve 1101 is installed. When the pressure inside the hydrogen storage cylinder 1 is higher than the working pressure, the hydrogen in the gas phase space of the hydrogen storage cylinder 1 can be preferentially utilized by opening the economy valve 1101, which helps to improve the economy of gas use.

[0069] Finally, it should be noted that, to ensure hydrogen safety, the liquid hydrogen supply system in this embodiment also includes a pressure sensor 12, a pressure transmitter 13, and a level sensor 14. The pressure transmitter 13 and the level sensor 14 are also connected to the vehicle controller. Furthermore, the pressure sensor 12, pressure transmitter 13, and level sensor 14 are all connected to the first pressure relief line 5 to facilitate monitoring of the pressure and level within the hydrogen storage tank 1.

[0070] In addition, the liquid hydrogen supply system of this embodiment also includes a flame detector 15, a gas detector 16, an audible and visual alarm 17, and a gas alarm control system 18. In one example, the flame detector 15, the gas detector 16, and the audible and visual alarm 17 are respectively connected to the gas alarm control system 18, and the gas alarm control system 18 is connected to the vehicle controller. The arrangement of each component can refer to the prior art.

[0071] It should also be noted that the aforementioned first solenoid valve 10011, second solenoid valve 906, pressure transmitter 13 and proportional valve are respectively connected to the vehicle controller.

[0072] It is worth noting that, regarding the liquid hydrogen supply system of this embodiment, based on the above exemplary implementations, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 3 As shown, the liquid hydrogen supply system includes a hydrogen storage cylinder 1 and a centralized discharge pipeline 2 connected to the hydrogen storage cylinder 1.

[0073] The centralized emission pipeline 2 can connect the gas phase space inside the hydrogen storage cylinder 1 and the hydrogen catalytic system 3. A first shut-off valve 2011 and a pressure relief valve 2012 are provided on the centralized emission pipeline 2. The first shut-off valve 2011 and the pressure relief valve 2012 are arranged sequentially along the fluid flow direction inside the centralized emission pipeline 2.

[0074] The liquid hydrogen supply system also includes a liquid hydrogen filling pipeline 4 connected to the hydrogen storage cylinder 1, a first pressure relief pipeline 5 that connects the hydrogen storage cylinder 1 and the centralized emission device 8, and a second pressure relief pipeline 6 that connects the liquid hydrogen filling pipeline 4 and the centralized emission device 8. The first pressure relief pipeline 5 is equipped with a first safety valve 501, and the second pressure relief pipeline 6 is equipped with a second safety valve 601. The safety threshold of the first safety valve 501 is lower than the safety threshold of the second safety valve 601.

[0075] The liquid hydrogen supply system also includes a return gas pipeline 7, which connects the hydrogen storage cylinder 1 and the return gas port a, and a second shut-off valve 701 is provided on the return gas pipeline 7. The liquid hydrogen supply system also includes a hydrogen supply pipeline 9 that connects the liquid phase space inside the hydrogen storage tank 1 to the fuel cell system, and a pressurization pipeline 10 that can pressurize the hydrogen storage tank 1.

[0076] The hydrogen supply line 9 is sequentially equipped with a first check valve 908, a fourth shut-off valve 903, an overflow valve 904, a vaporizer 901, a second control unit 907, a buffer tank 902, a pressure regulating valve 905, and a second solenoid valve 906. The vaporizer 901 is equipped with a first heat exchange tube 9011 and a second heat exchange tube 9012. The first heat exchange tube 9011 is connected in series in the hydrogen supply line 9, and the second heat exchange tube 9012 is connected in series in the pressurization line 10.

[0077] Specifically, the pressurization pipeline 10 includes a heating tube 1002 located inside the hydrogen storage cylinder 1, as well as a pressurization inlet pipe 1001, a first pressurization outlet pipe 1003, and a second pressurization outlet pipe 1004. One end of the heating tube 1002 is connected to the section between the first heat exchanger pipe 9011 and the proportional valve in the hydrogen supply pipeline 9 through the pressurization inlet pipe 1001. The other end of the heating tube 1002 is connected to one end of the first pressurization outlet pipe 1003 and the second heat exchanger pipe 9012. The other end of the second heat exchanger pipe 9012 is connected downstream of the proportional valve through the second pressurization outlet pipe 1004.

[0078] Along the flow direction of the fluid in the booster intake pipe 1001, a first solenoid valve 10011 and a third shut-off valve 10012 are sequentially provided on the booster intake pipe 1001; a third check valve 10041 is provided on the second booster outlet pipe 1004, and the third check valve 10041 can control the unidirectional flow of the fluid in the second heat exchange tube 9012 to the hydrogen supply pipeline 9.

[0079] The liquid hydrogen supply pipeline also includes a connecting pipeline 11, which is equipped with an economic valve 1101. One end of the connecting pipeline 11 is connected to the gas phase space inside the hydrogen storage cylinder 1, and the other end is connected to the hydrogen supply pipeline 9. The connection point between the connecting pipeline 11 and the hydrogen supply pipeline 9 is located downstream of the first check valve 908 and upstream of the fourth shut-off valve 903.

[0080] In the above preferred embodiments, hydrogen emissions can be reduced by setting up a centralized emission pipeline 2, thereby lowering the risk of safety hazards and improving the economic efficiency of gas use. By adjusting the gas flow rate in the hydrogen supply pipeline 9 and the booster pipeline 10 through a proportional valve, the two pipelines work together to ensure that the total amount of hydrogen flowing out of the gasified gas outlet is basically consistent with the amount of hydrogen flowing into the fuel cell system, which makes it less likely to cause pressure fluctuations.

[0081] Finally, it should be noted that for the above implementation methods, the outer front end cap of the hydrogen storage unit adopts a protective ring structure. Within the protective ring, the liquid hydrogen filling pipeline 4, the liquid supply pipeline 7, the centralized exhaust pipeline 2, and valves and instruments are integrated. The liquid hydrogen filling pipeline 4 and the liquid supply pipeline use vacuum pipelines, while the return pipeline 7 and the centralized exhaust pipeline 2 do not require insulation and can be arranged using conventional pipelines. This results in a highly integrated liquid hydrogen supply system within the protective ring, significantly reducing manufacturing processes and costs.

[0082] An embodiment of the second aspect of this application provides a vehicle equipped with the liquid hydrogen supply system described above.

[0083] The vehicle described in this embodiment, by applying the liquid hydrogen supply system, can reduce hydrogen emissions, improve the economy of hydrogen use, and reduce the risk of safety hazards, thus having good practicality.

[0084] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A liquid hydrogen supply system, characterized in that: Includes a hydrogen storage cylinder (1) and a centralized discharge pipeline (2) connected to the hydrogen storage cylinder (1); The centralized discharge pipeline (2) can connect the gas phase space inside the hydrogen storage cylinder (1) and the hydrogen catalytic system (3), and a first control unit (201) is provided on the centralized discharge pipeline (2). The first control unit (201) is used to control the flow of fluid in the centralized discharge pipeline (2).

2. The liquid hydrogen supply system according to claim 1, characterized in that: The first control unit (201) includes a first shut-off valve (2011) and a pressure relief valve (2012) arranged sequentially along the fluid flow direction in the centralized discharge pipeline (2).

3. The liquid hydrogen supply system according to claim 1, characterized in that: It also includes a liquid hydrogen filling pipeline (4) and a pressure relief pipeline connected to the hydrogen storage cylinder (1); The pressure relief pipeline includes a first pressure relief pipeline (5) that can connect the hydrogen storage cylinder (1) and the centralized discharge device (8), and a second pressure relief pipeline (6) that can connect the liquid hydrogen filling pipeline (4) and the centralized discharge device (8). Safety valves are provided on both the first pressure relief pipeline (5) and the second pressure relief pipeline (6). The safety threshold of the safety valve on the first pressure relief pipeline (5) is less than the safety threshold of the safety valve on the second pressure relief pipeline (6).

4. The liquid hydrogen supply system according to claim 3, characterized in that: It also includes a return gas pipeline (7), which can connect the hydrogen storage cylinder (1) and the return gas port (a), and a second shut-off valve (701) is provided on the return gas pipeline (7).

5. The liquid hydrogen supply system according to any one of claims 1-4, characterized in that: It also includes a hydrogen supply pipeline (9) that can connect the liquid phase space inside the hydrogen storage cylinder (1) and the fuel cell system, and a pressurization pipeline (10) that can pressurize the hydrogen storage cylinder (1). The pressurization pipeline (10) includes a heating tube (1002) located inside the hydrogen storage cylinder (1), and the two ends of the heating tube (1002) are respectively connected to the upstream and downstream of the vaporizer (901) in the hydrogen supply pipeline (9); The hydrogen supply pipeline (9) is provided with a second control unit (907), which is capable of controlling the flow rate of the fluid flowing through the hydrogen supply pipeline (9).

6. The liquid hydrogen supply system according to claim 5, characterized in that: The second control unit (907) includes a proportional valve provided on the hydrogen supply line (9); Along the flow direction of the fluid in the hydrogen supply line (9), the proportional valve is located downstream of the vaporizer (901) and upstream of the buffer tank (902) in the hydrogen supply line (9).

7. The liquid hydrogen supply system according to claim 6, characterized in that: The vaporizer (901) is provided with a first heat exchange tube (9011) and a second heat exchange tube (9012). The first heat exchange tube (9011) is connected in series in the hydrogen supply pipeline (9); One end of the heating tube (1002) is connected to the section between the first heat exchange tube (9011) and the proportional valve in the hydrogen supply pipeline (9) through the booster gas inlet pipe (1001). The other end of the heating tube (1002) is connected to one end of the second heat exchange tube (9012) through the first booster gas outlet pipe (1003). The other end of the second heat exchange tube (9012) is connected to the downstream of the proportional valve through the second booster gas outlet pipe (1004).

8. The liquid hydrogen supply system according to claim 7, characterized in that: Along the flow direction of the fluid within the booster intake pipe (1001), a first solenoid valve (10011) and a third shut-off valve (10012) are sequentially provided on the booster intake pipe (1001); and / or, The second pressurized gas outlet pipe (1004) is provided with a third check valve (10041), which can control the fluid in the second heat exchange tube (9012) to flow unidirectionally to the hydrogen supply pipe (9).

9. The liquid hydrogen supply system according to claim 8, characterized in that: It also includes a connecting pipe (11), on which an economic valve (1101) is provided. Upstream of the vaporizer (901), a first check valve (908), a fourth shut-off valve (903), and an overflow valve (904) are sequentially provided along the fluid flow direction in the hydrogen supply pipeline (9). One end of the connecting pipe (11) is connected to the gas phase space inside the hydrogen storage cylinder (1), and the other end is connected to the hydrogen supply pipe (9). The connection point between the connecting pipe (11) and the hydrogen supply pipe (9) is located downstream of the first check valve (908) and upstream of the fourth shut-off valve (903).

10. A vehicle, characterized in that: The vehicle is equipped with a liquid hydrogen supply system as described in any one of claims 1-9.

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