423 results about "Gaseous hydrogen" patented technology

The invention provides a fuel cell hydrogen supply system and a hydrogen supply method. The fuel cell hydrogen supply system comprises a liquid hydrogen storage tank, a first gas path connected between the liquid hydrogen storage tank and a fuel cell, a second gas path connected in parallel with the first gas path, and a control assembly, a gasification device is arranged on the first gas path, and a gas storage bottle is arranged on the second gas path; the control assembly comprises a controller and a plurality of control valves; the controller controls the plurality of control valves and can respectively control the connection or disconnection of the first gas path and the second gas path, so that the liquid hydrogen in the liquid hydrogen storage tank is conveyed to the fuel cell through the first gas path, and when the pressure of the gaseous hydrogen in the liquid hydrogen storage tank exceeds a first preset pressure threshold value, the gaseous hydrogen is stored in the gas storage bottle through the second gas path; and hydrogen can be supplied to the fuel cell through the second gas path. According to the fuel cell hydrogen supply system, gaseous hydrogen exceeding the first preset pressure threshold in the liquid hydrogen storage tank can be recycled, so that the release of the gaseous hydrogen to the outside is reduced, and the waste of resources is reduced.

Methods and systems providing a process for cooling and liquefying a purified gaseous hydrogen feed stream to a liquid hydrogen stream that may be stored in a liquid hydrogen storage tank, as well as a system wherein ortho-hydrogen (o-H2) contained in the purified gaseous hydrogen feed stream may be converted to para-hydrogen (p-H2) through serial low-temperature catalytic converters along the cooling process from normal ambient temperature (300K) to the liquefied temperature about (20K) of the hydrogen.

The invention discloses a hydrogen supply and energy storage device which comprises a hydrogen storage tank body, a gaseous hydrogen storage tank is installed in the hydrogen storage tank body, a liquid hydrogen storage tank is installed on the hydrogen storage tank body, a supporting plate is fixedly connected to the hydrogen storage tank body, and a cooling liquid storage box is installed at the top end of the supporting plate. A transverse plate is fixedly connected to the side wall of the cooling liquid storage box, metal cooling fins are arranged on the side wall of the transverse plate, and the cooling device further comprises a cooling circulation assembly and an air blowing cleaning assembly. A motor drives a first sector gear to rotate, the first sector gear is alternately engaged with a transmission gear and a driven gear, so that a rotating shaft drives metal heat dissipation fins to rotate for heat dissipation, and meanwhile, the driven gear drives cooling liquid to circularly flow in a sealing pipe, a cooling pipe and a liquid inlet pipe through a connecting rod and a piston rod; and cold airflow generated by the fan is used for dissipating heat of the hydrogen conveying pipe, so that the heat dissipation effect is improved.

The invention relates to a hydrogen supply system and a new energy automobile. The system comprises a liquid hydrogen module and a gas hydrogen module, wherein the liquid hydrogen module and the gas hydrogen module are used for respectively providing hydrogen and high-pressure hydrogen subjected to first pressurization treatment for a pressurization module; the first side of the recovery module is connected with the liquid hydrogen module, and the recovery module is used for receiving recovered gas hydrogen discharged by the liquid hydrogen module and obtaining pressurized recovered gas hydrogen; the second side of the recovery module is connected with the gas hydrogen module and is used for transmitting the pressurized recovered gas hydrogen to the gas hydrogen module; the pressurizing module is used for performing second pressurizing treatment and third pressurizing treatment on the hydrogen subjected to the first pressurizing treatment and the high-pressure hydrogen to obtain pressurized target hydrogen; the buffer module is used for supplying the supercharged target hydrogen to the engine module. By adopting the hydrogen supply system, under the condition of low liquid hydrogen storage pressure, the liquid hydrogen supply pressure can be effectively maintained, stable operation of a fuel cell is guaranteed, meanwhile, evaporated hydrogen of the liquid hydrogen system is recycled, the energy utilization rate is increased, and then the power and cruising ability of a vehicle are guaranteed.

A hydrogen storage and delivery system delivering storing and dispensing cryogenic liquid and gaseous hydrogen, comprising cryogenic liquid hydrogen storage vessels with heaters 1, 2, 3, ambient tempe

A system and method for hydrogen storage, and delivery. The system includes a hydrogen storage tank, a first pump disposed within the hydrogen storage tank, and a second pump disposed outside of the hydrogen storage tank. The hydrogen storage tank is to store gaseous hydrogen and liquid hydrogen. The first pump is to pump out liquid hydrogen out of the storage tank, producing a low pressure flow. The second pump is to receive this low pressure flow and produces a high pressure flow of liquid hydrogen. The system can also include a thermal device disposed within the hydrogen storage tank to heat gaseous hydrogen when a pressure within the hydrogen storage tank drops below a predetermined minimum pressure. The system can also include a heat exchanger to receive the high pressure flow of liquid hydrogen from the second pump.

The invention relates to a system for storing liquid hydrogen and for distributing gaseous hydrogen, comprising a source of liquid hydrogen (20), at least two gaseous hydrogen tanks (31-35) to be filled and a transfer device comprising: a transfer unit (25) configured to transfer liquid hydrogen from the hydrogen source (20) to any of the tanks, a vapour compressor (10) having a first upstream end and a second downstream end fluidly connected to each of the tanks, a set of valves (51-55), a control device configured to issue a command to transfer the liquid hydrogen and to open and / or close one or more valves (51-55), the compressor (10) being arranged so as to transfer vapours created during filling from any tank to each of the other tanks in succession, by compressing the vapors to a pressure greater than the pressure in the tank during filling.

The invention discloses a solid-gas coupling hydrogen storage system and a flow and pressure coordinated regulation and control method thereof. The system comprises a gaseous hydrogen storage tank, a solid hydrogen storage tank, a hydrogen coupling regulation and control device, a hydrogen buffer tank, a solid hydrogen storage thermal management system, a high-pressure proportional valve, a low-pressure proportional valve, a three-way valve and a hydrogen storage valve. The gaseous hydrogen storage tank is connected with the hydrogen coupling regulation and control device through a pipeline, and high-pressure hydrogen is conveyed to the high-pressure inlet end of the hydrogen coupling regulation and control device. The low-pressure inlet end of the hydrogen coupling regulation and control device is connected with the solid hydrogen storage tank through a pipeline, and the outlet end of the hydrogen coupling regulation and control device is connected with the hydrogen buffer tank through a pipeline; and the pipelines of the gaseous hydrogen storage tank and the solid hydrogen storage tank are simultaneously connected with the three-way valve. According to the system, efficient and safe hydrogen storage and supply are achieved through the synergistic effect of all the components, and reliable technical innovation and support are provided for hydrogen energy application.

According to the gas-liquid mixing hydrogen refueling station system with the cooling capacity recovery and gradient utilization functions, flash steam of the low-temperature liquid hydrogen storage tank is collected and stored in the low-temperature hydrogen storage tank, the cooling capacity of the flash steam is fully utilized, cooling capacity is provided for the heat exchanger, high-pressure hydrogen is cooled, the cooling capacity of the low-temperature flash steam of the liquid hydrogen is fully utilized, and the cooling capacity of the low-temperature flash steam of the liquid hydrogen is fully utilized. Energy gradient utilization of cooling capacity is achieved, and loss of extra energy in the hydrogen refueling station is reduced; the flash steam obtained after heat exchange is further used for hydrogen compression, and reutilization of the low-temperature liquid hydrogen flash steam is achieved; the flash steam after heat exchange is pressurized and then cooled by using the cooling capacity of the high-pressure liquid hydrogen, and meanwhile, the heating gasification of the high-pressure liquid hydrogen is realized, namely the gasification of the pressurized liquid hydrogen in the liquid hydrogen refueling station and the cooling of a gas hydrogen pressurization process in the liquid hydrogen refueling station are coupled for heat exchange, so that the utilization efficiency of the heat and the cooling capacity is greatly improved; an external vaporizer is not needed for high-pressure liquid hydrogen gasification, an external cooler is not needed in the gas-hydrogen pressurization process, and energy consumption is greatly reduced.

The invention discloses a low-temperature quick-start solid hydrogen storage device which comprises an insulating heat preservation shell and further comprises a solid hydrogen storage tank, a gaseous hydrogen storage tank, an air-cooled hydrogen fuel cell, a hydrogen supply mechanism and a heating mechanism, the solid hydrogen storage tank and the gaseous hydrogen storage tank are fixedly arranged in the insulating heat preservation shell, the solid hydrogen storage tank is filled with hydrogen storage alloy powder, and the air-cooled hydrogen fuel cell is arranged in the insulating heat preservation shell. A gas communicating pipe is fixedly arranged between the gaseous hydrogen storage tank and the solid hydrogen storage tank, a one-way valve is arranged in the gas communicating pipe, the air-cooled hydrogen fuel cell is arranged on one side of the insulation heat preservation shell, and the low-temperature quick-start solid hydrogen storage device is used for solving the problem that in the prior art, a solid hydrogen storage bottle is poor in hydrogen desorption performance in a low-temperature environment.

Railroad cars with countermeasure structures that minimize the likelihood of deflagration and detonation hazards in gaseous hydrogen fuel storage and supply component in one or more of the compartments of such railroad cars.

A facility for distributing liquefied hydrogen comprising a source of gaseous hydrogen, a liquefier, at least one means for storing liquid hydrogen, the liquefier comprising an outlet connected to an inlet of the storage means via a liquid circuit the facility comprising a liquid filling circuit provided with a first end connected to the storage means and a second end intended to be removably connected to a first end of a mobile liquid tank 6) to be filled, the facility further comprising a gas recovery circuit provided with a first end intended to be removably connected to a second end of the tank and a second end connected to a receiving member of the facility, the gas recovery circuit comprising a pressure and / or flow-rate regulating member, such as a valve for lowering the pressure in the mobile liquid tank to a determined filling pressure, the facility comprising an electronic control member comprising a microprocessor configured to receive at least one filling request signal from a mobile liquid tank, the pressure and / or flow-rate regulating member being adjustable and the electronic control member being configured to actuate the latter to regulate the pressure level in a mobile liquid tank to a determined filling pressure based on a received filling request signal.

A system and method for operation for cryo-compressed hydrogen storage can include: an inner pressure vessel that includes an inner liner with a defined inner volume configured for para to ortho conversion of gaseous hydrogen before venting; an insulation layer, situated outside the inner pressure vessel; an outer wall; and a support structure situated between the inner pressure vessel and the outer wall.

The invention belongs to the technical field of hydrogen storage, and particularly relates to a sealing device for a gaseous hydrogen storage well. A sealing device is used for sealing any two adjacent casing pipes of a gaseous hydrogen storage well and comprises a plurality of sealing rings which are sequentially arranged in the axial direction, the sealing rings are made of rubber materials with the hydrogen absorption expansion characteristic, and all the sealing rings are arranged to be capable of sequentially absorbing hydrogen to expand for sealing. The risk of hydrogen leakage can be reduced, and safe and efficient storage of hydrogen is achieved.

The present invention relates to an alkaline electrolysis device comprising: - at least one electrolysis cell comprising a reactor chamber which comprises a hydrogen-side reactor chamber region containing the aqueous electrolyte for decomposing the aqueous electrolyte into gaseous hydrogen and an oxygen-side reactor chamber region containing the aqueous electrolyte for decomposing the aqueous electrolyte into gaseous oxygen; - a hydrogen separator connected to the hydrogen-side reactor chamber region for separating the gaseous hydrogen from the aqueous electrolyte introduced into the hydrogen separator; and - an oxygen separator connected to the oxygen-side reactor chamber region for separating the gaseous oxygen from the aqueous electrolyte introduced into the oxygen separator; wherein the hydrogen separator has a first hydrogen separator outlet for removing the aqueous electrolyte having a first hydrogen concentration and a second hydrogen separator outlet for removing the aqueous electrolyte having a second hydrogen concentration that is less than the first hydrogen concentration; and where the first hydrogen separator outlet and the second hydrogen separator outlet are connectable or connected to the reactor chamber.

The invention discloses an SOFC-oriented multistage solid hydrogen storage system and method. The SOFC-oriented multistage solid hydrogen storage system comprises a gaseous hydrogen storage device and an air conveying device, the gaseous hydrogen storage device is connected with the SOFC and the combustion device through the hydrogen heat supplementing device; the air conveying device is connected with an air supply device, the end part of the air supply device is connected with an air heat compensation device through an air heat recovery device, and the air heat compensation device is connected with the SOFC; the hydrogen storage reactors are installed between the gaseous hydrogen storage device and the hydrogen heat supplementing device, the hydrogen storage reactors comprise a TiFe reactor, an Mg2Ni reactor and a TiH2 reactor, and the TiFe reactor, the Mg2Ni reactor and the TiH2 reactor are sequentially communicated. The system provides a safe, high-density and low-cost hydrogen storage function for the SOFC through integration of the SOFC and multi-stage solid hydrogen storage, high-temperature waste heat generated in the SOFC power generation process just provides a driving heat source for solid hydrogen storage and hydrogen desorption, and the defects in the prior art are overcome.

A method for electrolysis of water using a device having a reversible cell for the production of hydrogen and oxygen is disclosed. The method includes preparing an aqueous alkaline solution of KOH having a concentration of potassium hydroxide (KOH) of between 35% and 55% w / v in a mixer; heating the aqueous alkaline solution to between 150° C. and 374° C.; increasing the pressure to maintain the aqueous alkaline solution in the liquid phase at a minimum pressure condition of between 2.2 bar and 129.1 bar; passing the water through the hydrophobic layer of each electrode and reaching the catalyst layer to catalyse a reduction phase of the hydrogen or an oxidation phase of the oxygen and the porous electrode layer to carry out the reduction and oxidation; and collecting the released gaseous hydrogen and oxygen.

A propulsion system comprises a propulsive hydrogen-burning gas turbine engine, a first tank storing liquid hydrogen with an ullage and a first fuel line including a fuel pump and a vaporiser, the first fuel line providing gaseous hydrogen to the engine during operation of the system. A second tank storing gaseous hydrogen is coupled by a second fuel line to the first fuel line at a position thereon between the vaporiser and the engine, providing for engine start-up (when the vaporiser is inoperative) and power-boosting during operation of the system. A duct connects gaseous hydrogen within the second tank to the ullage in the first tank in order maintain pressure in the first tank as liquid hydrogen within it is depleted, preventing cavitation of liquid hydrogen within the fuel pump.

A H2 defueling system for automating defueling of a hydrogen tank is disclosed. The H2 defueling system comprises: a hydrogen storage tank containing hydrogen; a plurality of electronic valves configured for regulating hydrogen discharge of hydrogen from the hydrogen tank; at least one pressure sensor and at least one temperature sensor; a hydraulic circuit interconnecting the hydrogen tank, the plurality of electronic valves, the at least one pressure sensor and the at least one temperature sensor; and a control unit configured to: receive input from the at least one pressure sensor and the at least one temperature sensor; automatically adjust the flow rate of gaseous hydrogen from the storage tanks based on the input from the sensors to maintain the gaseous hydrogen within pressure limits; modulate operations of the plurality of electronic valves to control hydrogen discharge to control the flow of hydrogen from the hydrogen tank.

A method (100) for producing a synthesis product (6) is proposed, in which gaseous hydrogen (3) is provided by electrolysis (10) of water (1) and is subjected to a reaction (30) with one or more gaseous reactants (4) to form the synthesis product (6), wherein during a first process mode the hydrogen (3) and the one or more reactants (4) are mixed to obtain a reaction mixture (5), and the reaction mixture (5) or a portion thereof is stored under pressure in a storage unit (20), and wherein during a second process mode the reaction mixture (5) stored under pressure in the first process mode or a portion thereof is removed from the storage unit (20) and fed to the reaction (30) to form the synthesis product (6). A corresponding system is also proposed.

The utility model discloses a liquid hydrogen system and a vehicle, the liquid hydrogen system comprises: a liquid hydrogen storage member for storing liquid hydrogen; one end of the evaporation pipeline is communicated with the liquid hydrogen storage part; the other end of the evaporation pipeline is communicated with the buffer part so as to supply gaseous hydrogen to the buffer part, and the buffer part is used for being communicated with a fuel cell so as to supply gaseous hydrogen to the fuel cell; and the pressurizing pipeline is provided with a pressurizing inlet and a pressurizing outlet, the pressurizing inlet is communicated with the buffer piece, and the pressurizing outlet is communicated with the liquid hydrogen storage piece so as to guide the gaseous hydrogen into the liquid hydrogen storage piece. The pressurizing pipeline is arranged between the liquid hydrogen storage piece and the buffering piece, the gaseous hydrogen in the buffering piece is guided into the liquid hydrogen storage piece through the pressurizing pipeline, the pressure in the liquid hydrogen storage piece is increased through the gaseous hydrogen, the whole structure is simple, implementation is easy, and the problem that the pressure in the liquid hydrogen storage piece is insufficient is solved.

A propulsion system comprises a propulsive hydrogen-burning gas turbine engine, a first tank storing liquid hydrogen with an ullage and a first fuel line including a fuel pump and a vaporiser, the first fuel line providing gaseous hydrogen to the engine during operation of the system. A second tank storing gaseous hydrogen is coupled by a second fuel line to the first fuel line at a position thereon between the vaporiser and the engine, providing for engine start-up (when the vaporiser is inoperative) and power-boosting during operation of the system. A duct connects gaseous hydrogen within the second tank to the ullage in the first tank in order maintain pressure in the first tank as liquid hydrogen within it is depleted, preventing cavitation of liquid hydrogen within the fuel pump.

The invention discloses a method, a system, a medium and equipment for predicting hydrogen in oxygen of an alkaline electrolysis system, and the method comprises the steps: obtaining a total calculation formula for predicting hydrogen in oxygen of the alkaline electrolysis system based on the contribution of dissolved hydrogen which is not separated by a gas-liquid separator, gaseous hydrogen which is not separated by the gas-liquid separator, electrolytic bath saturation diffusion and electrolytic bath supersaturation diffusion mechanisms to hydrogen in oxygen of the system; according to experimental data of the alkaline electrolysis system under different alkaline liquid circulation flow working conditions, calibrating a to-be-fitted coefficient; according to experimental data of the alkaline electrolysis system under different system pressure working conditions, calibrating a to-be-fitted coefficient; according to experimental data of the alkaline electrolysis system under different working current working conditions, calibrating a to-be-fitted coefficient; according to experimental data of the alkaline electrolysis system under different temperature working conditions, a to-be-fitted coefficient sum is calibrated; and inputting temperature, pressure, alkali liquor circulation flow and current experiment data of the alkaline electrolysis system, and calculating hydrogen in oxygen of the alkaline electrolysis system so as to output system HTO under different operation conditions in real time.

The application relates to the technical field of hydrogen energy transportation and material performance testing, and relates to a test structure for hydrogen permeation testing under a high-pressure gaseous hydrogen environment, a mounting method and application thereof. The test structure comprises a sample body and an insulating sealing assembly, and the sample body is in a double-stage disc structure. The uppermost edge of the first sealing insulating assembly is flush with the upper end surface of the cylindrical platform, and the sample body is matched with the inner side of the first sealing insulating assembly for installation. The second sealing insulating assembly is in an open-upward shape, and the first sealing insulating assembly is matched with the second sealing insulating assembly for installation. The test surface of the sample body of the test structure is kept consistent with the flow field of the gas main stream, and when the test structure is used for testing, the permeation behavior of the hydrogen flow to the material surface can be truly reflected. All clamping and conducting structures are arranged on the outer part of the pipe wall of the test pipeline or the left part of the sample body, so that flow field disturbance is avoided in the main path of the gas flow.

The invention discloses a multi-rotor hydrogen energy unmanned aerial vehicle which comprises an unmanned aerial vehicle body, a gaseous hydrogen storage bottle, a plurality of arm spans and a plurality of propeller pile fusion type structures. The gaseous hydrogen storage bottle is arranged on the unmanned aerial vehicle body, and the plurality of arm spans are uniformly arranged on the side surface of the unmanned aerial vehicle body; the propeller pile fusion type structure is arranged at the end, away from the unmanned aerial vehicle body, of the arm extension, and the propeller pile fusion type structure and the arm extension are arranged in a matched mode. According to the structure, the air-cooled reactor is arranged below the blades of the unmanned aerial vehicle to form a propeller-reactor fused structure, high-speed airflow generated by the propeller blade thruster is directly used for air inlet reaction and cooling of the air-cooled reactor, and the heat dissipation performance of a battery loaded on the unmanned aerial vehicle can be greatly improved on the basis that the structure of the unmanned aerial vehicle is not changed; and the requirements of actual use are well met.

The invention relates to the technical field of hydrogenation, and discloses a hydrogen derivative in-station hydrogen production and refueling station and an operation method.The hydrogen derivative in-station hydrogen production and refueling station is composed of a hydrogen derivative hydrogen production end, a buffer boosting system, a low-pressure storage tank, a high-pressure compressor, a multi-stage high-pressure storage tank, a pre-cooling system and a filling module; the invention further discloses an operation method of the hydrogen derivative in-station hydrogen production and refueling station. The operation method comprises the steps that information intercommunication is conducted between the hydrogen fuel cell vehicle and the refueling station; forming a future refueling demand curve of the hydrogen refueling station based on the vehicle information and the station arrival refueling time which can be selected by the hydrogen fuel cell vehicle; the hydrogen refueling station combines the formed future refueling demand curve to carry out in-station hydrogen production feedback production; the in-station control system controls boosting storage; and when the vehicle arrives at the station, the filling module performs graded gas taking and filling. High-pressure gaseous hydrogen in the station is in a fixed range, the remaining amount of gaseous hydrogen in the station is reduced, the safety level of the hydrogen refueling station is guaranteed, and the cost of a storage tank in the station and compression energy consumption are reduced.

Disclosed is a liquid hydrogen-based power pack integrated thermal management system comprising: a fuel cell which is supplied with gaseous hydrogen and oxygen and causes a reaction between the gaseous hydrogen and oxygen to generate electric energy; a hydrogen fuel tank which stores and supplies liquid hydrogen; a heat exchanger which heats and vaporizes the liquid hydrogen supplied from the hydrogen fuel tank via a first hydrogen line and supplies the vaporized hydrogen to the fuel cell via a second hydrogen line, and which supplies cooling water for keeping the fuel cell within a normal operating range temperature by reducing, via a first refrigerant line, the heat load on the fuel cell generated during the operation of the fuel cell, wherein a shell storing the cooling water is connected to the fuel cell via a second refrigerant line, and a spiral heat transfer tube connected at both ends to the first and second hydrogen lines is embedded in the shell; and a control module for overall control of the operation, pressure, and temperature of the system.

A hydrogen fuel system for a work machine is disclosed. The hydrogen fuel system comprises a hydrogen storage tank containing hydrogen, the hydrogen being at least one of a liquid hydrogen or a gaseous hydrogen; a hydrogen power unit configured to consume the hydrogen from the hydrogen storage tank, the hydrogen power unit including at least one of a plurality of fuel cells or a hydrogen combustion engine; a boil-off pressure relief valve in fluid communication with the hydrogen storage tank; and a tank pressure sensor in communication with the boil-off pressure relief valve. The boil-off pressure relief valve is configured to, when the tank pressure sensor detects a pressure inside the hydrogen storage tank that exceeds a boil-off pressure threshold, vent the gaseous hydrogen to a boil-off fuel line fluidly connected to the hydrogen power unit.

The invention discloses a hydrogen brittleness performance evaluation method for a hydrogen transport pipeline, which comprises the following steps: obtaining the average hydrogen concentration in a sample through a high-pressure hydrogen permeation test of a wafer sample, and obtaining the hydrogen concentration and hydrogen diffusion coefficient of the surface of the sample under a specific electrochemical hydrogen charging condition through an electrochemical hydrogen charging test of the wafer sample; a finite element analysis model of a target sample is established to simulate the change relation of the total amount of hydrogen atoms in the target sample along with time under the electrochemical hydrogen charging condition, and the electrochemical hydrogen charging time equivalent to the high-pressure gaseous hydrogen charging is obtained by comparing the high-pressure gaseous hydrogen charging with the electrochemical hydrogen charging. The target sample is charged with hydrogen through an electrochemical hydrogen charging method, and finally the hydrogen embrittlement performance of the target sample is obtained through a hydrogen embrittlement performance test. According to the method, simple finite element simulation and electrochemical hydrogen charging are combined, high-pressure gaseous hydrogen charging which is complex, low in efficiency and high in danger is replaced, and the detection time of the hydrogen embrittlement performance test of the hydrogen charging pipe is shortened.

The present application discloses a piston liquid hydrogen pump and a hydrogen fueling system. In the piston liquid hydrogen pump, a first piston is provided in a driving cavity, a first driving liquid inlet / outlet is formed in a first driving cavity, and a second driving liquid inlet / outlet is formed in a second driving cavity; a liquid passing hole making the first driving cavity and the second driving cavity communicated with each other is formed in the first piston, and a mushroom valve assembly is movably provided in the liquid passing hole and seals the liquid passing hole when moving to openings of the liquid passing hole; a second piston is provided in a hydraulic cavity; a piston rod is sealingly connected between the first piston and the second piston, and a liquid hydrogen one-way inlet and a liquid hydrogen one-way outlet are formed in a second hydraulic cavity. The hydrogen fueling system comprises a liquid hydrogen storage tank, a vaporizer, a buffer tank, a liquid hydrogen pipe, a gaseous hydrogen fueling machine, and the piston liquid hydrogen pump. According to the piston liquid hydrogen pump and the hydrogen fueling system provided by the present application, the start and stop of the pistons are mechanically controlled by means of the mushroom valve assembly, so that the failure rate is low, and the stability and the reliability are achieved; and the mushroom valve assembly has a low mass, so that the response speed can be increased, and the control precision can be improved.