734 results about "High pressure hydrogen" patented technology

To provide a system, a method, and an application for carbon recovery system for compact type vessel based on connection between methanol reforming and high-efficiency membrane separation.SOLUTION: Propulsive power is supplied to a vessel by using a methanol aqueous solution as a raw material through steps such as reforming, separation of a reformate product, and hydrogen combustion, hydrogen fuel is manufactured through methanol steam reforming, anxiety about safety of high pressure hydrogen storage in a prior art is eliminated, efficient carbon recovery is carried out by storing separated carbon dioxide by compression and liquefying, heat is supplied for methanol steam reforming and preheating of the fuel by using excess heat of discharged flue gas, and comprehensive use of energy is achieved. Use of hydrogen energy is realized by a vessel without requiring storage and transportation of hydrogen, and a shipping industry contributes to green, low carbon, and sustainable development.SELECTED DRAWING: Figure 1

The invention relates to a cathode closed type air-cooled fuel cell for an unmanned aerial vehicle and a working method of the cathode closed type air-cooled fuel cell. The fuel cell comprises a hydrogen supply subsystem, an oxygen supply subsystem, a cooling path subsystem and an electric pile, the hydrogen supply subsystem and the oxygen supply subsystem complete heat exchange between liquid hydrogen and high-temperature air through a liquid hydrogen vaporizer, and the effects of liquid hydrogen vaporization and high-temperature air cooling are achieved. By arranging the first vortex tube to replace a traditional pressure reducing valve, potential energy of vaporized high-pressure hydrogen is recovered by the first vortex tube, the vaporized high-pressure hydrogen is separated into cold flow and hot flow in the first vortex tube, and the hot flow partially enters an end plate of the galvanic pile to heat the end plate, so that the temperature distribution in the galvanic pile is optimized, and the voltage consistency between single cells is improved; therefore, the performance and durability of the stack are improved. When the fuel cell is used for the unmanned aerial vehicle, the fan of the fuel cell is also used as a propeller of the unmanned aerial vehicle, so that the system integration level is increased.

The invention discloses a piston type compressor driven by liquid pressure, which is characterized in that hydraulic and gas compression components are integrated in a cylinder body, a crankshaft rotates to drive a hydraulic piston, then a gas piston is driven by utilizing the characteristic that liquid cannot be compressed, the upper part of the gas piston is filled with sealing liquid, a gap of a sealing ring is filled, and gas leakage is reduced. According to the structure, lubricating and hydraulic media can be combined into a whole, hydraulic oil is stored through the crankcase and serves as the lubricating media, and the equipment size is further reduced in the mode that an oil pump is arranged inside. And meanwhile, a multi-stage compression form can be combined, so that the discharge pressure is further improved. The invention can be used for high-pressure hydrogen filling piston type compressors of gas stations and energy storage stations, and can also be used in the field of other high-pressure and ultrahigh-pressure gas compressors.

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.

The invention belongs to the technical field of metal composite materials and hydrogen storage and transportation materials, and particularly relates to a high-strength hydrogen-embrittlement-resistant layered metal composite material for hydrogen storage and a preparation method and application of the high-strength hydrogen-embrittlement-resistant layered metal composite material. According to the preparation method, the nickel-saving austenitic stainless steel (NEASS) and the 30CrMo steel are alternately overlapped in a multi-layer mode, and the processes of vacuum electron beam welding, high-temperature hot rolling, accumulative ply rolling, multi-stage heat treatment and the like are combined, so that the composite board with the layer number reaching hundreds of layers, firm interface bonding, excellent mechanical performance and good hydrogen embrittlement resistance is prepared; the technical problem that strength, toughness and hydrogen brittleness resistance of an existing metal material in a high-pressure hydrogen environment are difficult to consider at the same time is solved. The obtained composite material has high strength, high plasticity and excellent hydrogen embrittlement resistance, and is suitable for structural materials of high-pressure hydrogen storage tanks, hydrogen conveying pipelines and other key hydrogen energy equipment.

The invention discloses a non-metal composite hydrogen conveying hose with a multi-form hydrogen blocking layer. The non-metal composite hydrogen conveying hose comprises a non-metal inner pipe, a non-metal fiber reinforcement layer and a non-metal outer protection pipe which are sequentially arranged from inside to outside in a sleeving mode. The non-metal inner pipe sequentially comprises an organic hydrogen-resistant coating, a composite fiber lining pipe and a barrier layer from inside to outside; the non-metal fiber reinforced layer sequentially comprises a fiber pre-impregnated winding layer and a reinforcing rib layer from inside to outside; the non-metal inner pipe and the non-metal fiber reinforced layer are bonded with each other by adopting thermosetting polyurethane; the non-metal fiber reinforcement layer and the non-metal outer protection pipe are connected in a non-bonding mode. The non-metal composite hose has good hydrogen leakage prevention capacity and flexibility and can be used for high-pressure hydrogen conveying.

The invention relates to a solid oxide electrolytic cell hydrogen production system and an operation method thereof. The solid oxide electrolytic cell hydrogen production system comprises an SOEC galvanic pile module, a fan, an air electric heater, a steam superheater, a deionized water pump, a first preheater, a second preheater, a steam generator, a condenser, a high-pressure hydrogen cylinder, a high-pressure protective gas cylinder, a compressed air cylinder, a first electromagnetic valve and a second electromagnetic valve. Wherein the air electric heater is sequentially connected with the water vapor superheater and the SOEC stack module and can be used for heating air and water vapor at an inlet of the SOEC stack module. According to the embodiment of the invention, heating of air and water vapor at the inlet of the SOEC galvanic pile module is met by adopting the air electric heater, so that waste heat of mixed gas at the outlet of the SOEC galvanic pile module is utilized in a gradient manner, the electrolytic hydrogen production efficiency is effectively improved, meanwhile, the power consumption is effectively reduced, and the system is simple in design structure, convenient to realize low-cost manufacturing and suitable for popularization and application. And the high-efficiency and energy-saving electrolytic hydrogen production requirement can be met.

The invention discloses a hydrogen storage cylinder co-cured by a titanium alloy liner and fiber prepreg and a preparation method thereof, and the preparation method comprises the following steps: preparing a graphene modified PEEK water-based suspension; preparing a graphene modified carbon fiber / PEEK prepreg and a graphene modified glass fiber / PEEK prepreg by using the graphene modified PEEK water-based suspension liquid; the titanium alloy hydrogen storage cylinder inner container is machined and formed, the surface of the titanium alloy hydrogen storage cylinder inner container is anodized, and a uniform and compact titanium oxide film is formed; and sequentially winding the graphene modified carbon fiber / PEEK prepreg and the graphene modified glass fiber / PEEK prepreg on the outer side of the anodized titanium alloy hydrogen storage cylinder liner through a laser winding technology. The hydrogen storage cylinder prepared by the preparation method has the characteristics of high strength, good toughness, high temperature resistance, high flame retardance and the like, can provide long-term reliable safety guarantee in high-pressure hydrogen storage application, and is suitable for hydrogen storage requirements of electric / hydrogen energy hybrid aircrafts.

The invention discloses a high-pressure combustion combined heat and power generation energy storage system and method for hydrogen and oxygen production through electrolysis, and relates to the field of hydrogen energy storage. After the electrolytic cell produces high-pressure hydrogen and oxygen, the high-pressure hydrogen and oxygen are stored in the hydrogen / oxygen storage tank, the system can operate in a hydrogen / oxygen mode, and in the oxygen mode operation, the hydrogen and oxygen steam mixed gas from the oxygen storage tank and the hydrogen / oxygen evaporation compressor are combusted in the high-pressure combustion chamber to generate superheated steam, and then the superheated steam enters the expansion turbine to do work; due to excessive oxygen, dead steam after acting is separated into two working media through a gas-liquid separator, that is, gas enters a cooler to be cooled and then returns to a combustion chamber through a hydrogen / oxygen evaporation compressor, drainage water generated after liquid enters a heat supply heat exchanger is pressurized through a water pump and then enters a high-temperature combustion chamber, and therefore clean utilization of hydrogen energy and cyclic regeneration of the working media are achieved. The system can realize high power generation efficiency and excellent environmental protection performance, and is suitable for regions requiring stable consumption of fluctuating renewable energy sources, power and heat supply and the like.

The invention belongs to the technical field of ferrous metallurgy, and relates to high-grade hydrogen transmission pipeline steel and a preparation method thereof.The high-grade hydrogen transmission pipeline steel is prepared from, by mass, 0.02%-0.04% of C, 0.20%-0.30% of Si, 1.20%-1.30% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.0010% of S, 0.015%-0.055% of Alt, smaller than or equal to 0.0020% of N, smaller than or equal to 0.0010% of O, smaller than or equal to 0.0001% of H, 0.90%-1.00% of Cr, 0.40%-0.50% of Mo, 0.020%-0.030% of Ti, 0.05%-0.07% of Nb, 0.40%-0.50% of Ni and the balance iron and inevitable impurities; various performance indexes, especially hydrogen induced crack resistance indexes, of the composite material are outstanding, CSR is equal to 0, CLR is equal to 0, CTR is equal to 0, slow tensile IRA and IEL are smaller than or equal to 20% in a solution A, KIH of a stepped compact tensile sample is larger than or equal to 100 MPa.m < 1 / 2 > in a 6.3 MPa pure hydrogen environment, and the fatigue life is larger than or equal to 500,000 times; according to the method, the technical problems in the research and development process of the steel material for the hydrogen conveying pipeline are solved, the technical scheme is relatively simple and easy to implement, the obtained product is high in performance stability and controllable in cost, and popularization and application in long-distance, large-scale and safe conveying pipeline construction of high-pressure hydrogen are facilitated.

To provide an electrochemical hydrogen booster system in which a regenerated hydrogen gas can be utilized without being discharged to the outside as waste and the decline of a hydrogen production efficiency of the electrochemical hydrogen booster system can be suppressed.SOLUTION: An electrochemical hydrogen booster system 10 comprises: a hydrogen booster stack 16 for releasing a hydrogen gas supplied to an anode electrode as a highly pressured hydrogen gas boosted from a cathode electrode through a polymer electrolyte; a hydrogen supply apparatus 14 for supplying the hydrogen gas to the anode electrode of the hydrogen booster stack 16 through a hydrogen supply flow path 60; a PSA apparatus 22 including multiple adsorption towers 24 for dehumidifying the highly pressurized hydrogen gas released from the hydrogen booster stack 16; and a return flow path 94 for recycling a regenerated hydrogen gas utilized for the regeneration in the adsorption tower 24 into the hydrogen supply flow path 60 or the hydrogen supply apparatus 14.SELECTED DRAWING: Figure 1

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.

The invention relates to a gas-liquid separator with a purification function and an electrolytic hydrogen production system. The gas-liquid separator comprises a pressure electrolytic bath, a circulating tank and three groups of gas-liquid separators, the pressure electrolytic cell electrolyzes water to decompose hydrogen and oxygen through an alkaline solution, the pressure valve controls the cathode liquid outlet to be opened after detecting that the air pressure in the pressure electrolytic cell reaches a high pressure value, and catholyte bubble water enters the circulation tank. The first-stage gas-liquid separator and the second-stage gas-liquid separator are used for receiving the catholyte containing bubbles at the first liquid outlet and the target gas containing more impurities at the third gas outlet, carrying out gas-liquid separation to obtain the target gas containing a small amount of impurities, and discharging the catholyte; target gas containing a small amount of impurities enters the third-stage gas-liquid separator, high pressure generated in the pressure electrolytic cell provides power for the target gas to pass through a separation membrane, the target gas is separated from the remaining impurities, the volume ratio of the target gas in gas exhausted from a first gas outlet of the third-stage gas-liquid separator is larger than 99.999%, and the gas exhausted from a second gas outlet of the third-stage gas-liquid separator is larger than 99.999%. And high-pressure hydrogen can be directly supplied.

The invention provides a novel renewable energy hydrogen energy storage system and an operation method thereof. The hydrogen energy storage system comprises an energy storage cycle unit, an energy release cycle unit, a heat energy utilization unit and the like. The energy storage cycle and the energy release cycle of the system are mutually independent loops, the fuel cell and the gas turbine are utilized in the hydrogen energy storage system to supplement the generating capacity, cooling water is used as a heat exchange medium, heat generated in the operation process of the system is stored, and the energy storage cycle and the energy release cycle of the system are mutually independent loops. And the working capacity of high-pressure hydrogen in front of the expansion machine is improved by utilizing tail gas of the gas turbine and hot water generated by utilizing waste heat of equipment, and consumed power in the hydrogen compression process is recycled by utilizing the hydrogen expansion machine. According to the hydrogen energy storage system, conversion of electric energy, hydrogen energy and heat energy is achieved through multi-stage recovery and utilization of heat energy, the working state of the valve can be adjusted according to the load requirement of a power grid, the operation methods of the hydrogen fuel cell and the gas turbine are switched, and the response flexibility, the energy release power density and the energy circulation efficiency of the system are improved.

The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a production process for producing low-sulfur marine fuel oil through waste rubber tire hydro-liquefaction, which comprises the following steps: (1) mixing oil slurry, waste tire rubber powder and a catalyst to obtain a mixture, enabling the mixture to pass through a swelling preheater, and enabling the mixture and hydrogen to enter a slurry bed reactor for hydro-liquefaction, the liquefied intermediate product passes through a high-pressure separator, hydrogen obtained through separation enters a fixed bed hydrofining device, and obtained liquid enters a rectifying tower through a pressure reducing valve; (2) feeding a liquid product at the bottom of the rectifying tower and hydrogen into a fixed bed hydrofining device; and (3) carrying out gas-liquid separation on the fixed bed hydrofining product, wherein the liquid obtained by the gas-liquid separation is the low-sulfur marine fuel oil. According to the invention, waste tire rubber powder and slurry oil are used as raw materials, the liquefaction of waste rubber tires is realized in high-pressure hydrogen and high-temperature environments, and a fixed bed hydrofining device is combined to further reduce the content of sulfur atoms so as to produce the low-sulfur fuel oil for ships.

The invention relates to hydrogen transmission pipeline steel L245MH and a production method thereof, and belongs to the technical field of production of hot-rolled coil plates for transmission pipelines, and the hydrogen transmission pipeline steel L245MH comprises the following chemical components in percentage by mass: 0.035 to 0.055 percent of C, 0.05 to 0.20 percent of Si, 0.60 to 0.90 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.0010 percent of S, less than or equal to 0.0012 percent of O, 0.020 to 0.040 percent of Als, 0.010 to 0.025 percent of Nb, 0.005 to 0.020 percent of Ti, 0.10 to 0.25 percent of Cr, 0.0045 to 0.0090 percent of Ce, less than or equal to 0.0080 percent of N and the balance of Fe and inevitable impurities. By adopting the component design and combining a Ce alloying process under a vacuum condition and a carbide dispersion precipitation process under accelerated cooling, the obtained pipeline steel L245MH has good high-pressure hydrogen compatibility performance.

The invention discloses a high-pressure hydrogen valve with high sealing performance, and belongs to the technical field of high-pressure hydrogen valves. The high-pressure hydrogen valve with the high sealing performance comprises a connecting valve body, and an auxiliary flow guide plate is arranged and is overturned upwards, so that the pressure at the position of a sealing head is reduced; by arranging the structure of the inner adjusting cylinder, the pressure of the position of the communicating groove is shared, vibration caused by sudden change of the internal pressure is avoided, by arranging the structure of the buffer plate, the pressure of hydrogen impact is changed into elastic potential energy to be absorbed, and meanwhile in the process of pushing the damping push plate, the damping effect is improved. By arranging the structure of the indicating push rod, magnetic repulsive force can horizontally push the magnetic piece and the indicating push rod to move forwards, whether the internal pressure exceeds the safety range or not can be observed according to the moving distance of the indicating push rod, and maintenance is convenient.

The invention belongs to the technical field of metal material and coating performance detection, and particularly relates to a high-pressure hydrogen permeation testing device and method.The testing device comprises a gas phase system and an electrochemical testing system, and the gas phase system comprises a high-pressure kettle, a hydrogen cylinder, a nitrogen cylinder and a vacuum treatment device; the autoclave is sealed and communicated with the hydrogen cylinder, the nitrogen cylinder and the vacuum treatment device; a first test port is formed in the upper part of the autoclave; the electrochemical testing system comprises an electrochemical workstation and an electrolytic tank; the electrolytic tank is connected to the upper part of the autoclave; the electrolytic tank is provided with a reference electrode and an auxiliary electrode, the lower part of the electrolytic tank is provided with a second test port, and the first test port and the second test port are connected with closed rubber rings and jointly clamp a sample to be tested through the closed rubber rings; the electrochemical workstation is electrically connected with the auxiliary electrode, the reference electrode and the to-be-tested sample, so that the service condition of the to-be-tested sample can be accurately simulated, the hydrogen permeation process in the actual working condition can be more truly reflected, and the accuracy of a hydrogen permeation test experiment is improved.

The invention discloses a nested high-pressure hydrogen pressure reduction and relief integrated device and a use method, and relates to the technical field of high-pressure gas pressure reduction and relief, the nested high-pressure hydrogen pressure reduction and relief integrated device comprises a valve shell, a gland, a valve body, a porous hedging throttling element and a gas outlet pressure control element, the top of the first hedging channel and the top of the second hedging channel are oppositely arranged, so that hydrogen flowing out of the first hedging channel and hydrogen flowing out of the second hedging channel form gas hedging to depressurize high-pressure hydrogen and reduce the flow rate and kinetic energy of the hydrogen; when the pressure of hydrogen entering the communicating cavity is smaller than the designed pressure, the gas outlet pressure control piece enables the valve body to abut against the top of the valve shell so as to close the pressure relief openings, and when the pressure of hydrogen entering the communicating cavity is larger than the designed pressure, the gas outlet pressure control piece enables the valve body to abut against the top of the valve shell so as to close the pressure relief openings. The valve body slides downwards and slides to the position where the pressure relief opening is opened so that part of hydrogen can flow out of the pressure relief opening to relieve the air pressure of the communicating cavity, the structure is simple, the space utilization rate is effectively increased, and cost is effectively reduced.

The invention discloses a high-pressure hydrogen pressure reducing valve with a spiral flow channel structure. The high-pressure hydrogen pressure reducing valve comprises a valve body, a sealing end cover, a needle-shaped valve element and an inlet end cover. A through cavity is formed in the center of the valve body in the axial direction. The sealing end cover, the needle-shaped valve element and the inlet end cover are sequentially and coaxially assembled and connected into the cavity of the valve body from top to bottom. A gas outlet channel is arranged on the side wall of the valve body and located between the sealing end cover and the needle-shaped valve element, a gas inlet channel is arranged at the bottom of the inlet end cover, and gas enters from the gas inlet channel and is exhausted through the gas outlet channel. The needle valve has the advantages of being simple in structure and long in service life, and the two spiral flow channel notches are evenly distributed in the outer surface of the needle valve element; due to the design of the spiral flow channel, the hydrodynamic performance is effectively improved, the reliability of the system is enhanced, and meanwhile the energy utilization rate and the impact resistance are improved; in addition, the pressure of hydrogen at the outlet of the valve body can be effectively controlled through the design of the adjusting channel, and the pressure is still kept relatively stable under extreme conditions.

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 relates to a high-pressure hydrogen nano-pore permeability testing device and method based on double-chamber pressure balance, and belongs to the technical field of unconventional oil gas. The device comprises a high-pressure gas source, a pressurization module, a double-layer nested core reaction kettle module and a high-frequency data acquisition and safety monitoring module; by constructing a double-layer nested structure that inner cavity hydrogen is actively wrapped by outer cavity nitrogen and cooperating with an all-metal knife edge hard sealing device and a different flow pattern permeability calculation method, accurate measurement of the Ndarcy grade permeability of the compact cover rock is successfully achieved, the industrial pain point that a traditional device is inaccurate in measurement, unstable in measurement and unsafe is thoroughly solved, and the method is suitable for large-scale popularization and application. And key experimental technology guarantee and scientific data support are provided for closure evaluation of underground hydrogen storage engineering and exploration and development of natural hydrogen resources.

The invention discloses a high-pressure hydrogen pressure reducing valve combined by a multi-layer labyrinth sleeve and an opposite flushing type valve core structure. The high-pressure hydrogen pressure reducing valve comprises a valve body, a valve cover, a valve core rod, a valve seat and the labyrinth sleeve, an air inlet and an air outlet are formed in the surface of the valve body, and an air channel is formed in the valve body and communicates with the air inlet and the air outlet; valve covers are buckled at the two ends of the valve body; the valve core rod comprises a first valve core rod and a second valve core rod; the first valve element rod and the second valve element rod are arranged at the two ends in the valve body respectively. The surface of the second valve core rod is provided with a hedging type runner groove; the valve seat comprises a first valve seat and a second valve seat; the first valve seat and the second valve seat are both arranged in the valve body, the first valve seat is arranged outside the first valve element rod in a sleeving mode, and the second valve seat is arranged outside the second valve element rod in a sleeving mode. A plurality of labyrinth sleeves are arranged and are overlapped and sleeved with one another; a continuous labyrinth channel is formed in the surface of the labyrinth sleeve; the multiple labyrinth sleeves are arranged outside the first valve element rod in a sleeving mode after being stacked. The pressure reducing valve is good in pressure reducing effect, and the outlet pressure can be stabilized.

A lightweight depressurization hydrogen supply device suitable for a hydrogen energy handheld torch is provided. The device is configured to connect a gas cylinder to a combustor in the torch and includes a cylinder opening valve, a pressure reducing valve, a switch assembly, a switch actuating component, and a gas cylinder cap. The pressure reducing valve is configured to perform depressurization of high pressure hydrogen, and is provided with three butting ports. A lower butting port is connected to the gas cylinder cap, an upper butting port is connected to the combustor, a side butting port is provided with the switch assembly, and the switch actuating component and the cylinder opening valve are installed in the gas cylinder cap. The switch assembly is configured to control the switch actuating component to open or close the cylinder opening valve. The cylinder opening valve is connected to a cylinder opening of the gas cylinder and configured to open or close the gas cylinder.

The hydrogen transmission pipeline steel comprises the following chemical components in percentage by mass: 0.020%-0.045% of C, 0.11%-0.19% of Si, 1.45%-1.65% of Mn, less than or equal to 0.0010% of S, less than or equal to 0.008% of P, 0.015%-0.045% of Al, 0.040%-0.060% of Nb, 0.020%-0.035% of Ti, 0.30%-0.50% of Cr, 0.0040%-0.0080% of RE, less than or equal to 0.004% of N, less than or equal to 0.0015% of O, less than or equal to 0.0001% of H and the balance of Fe and other inevitable impurities, the conditions that the carbon equivalent Ceq = C + Mn / 6 + (Cr) / 5 is less than or equal to 0.35%, the Nb / Ti = the rare earth element is selected from at least one of lanthanum, cerium and neodymium. The invention aims to solve the technical problems that the existing hydrogen transmission pipeline steel is easy to generate hydrogen embrittlement, short in fatigue life and high in production cost in a high-pressure hydrogen environment, and meets the core requirements of hydrogen energy long-distance transmission pipeline engineering on high strength, high hydrogen embrittlement resistance, high fatigue performance and low cost of materials.

The invention discloses a hydrogen deep hypothermia three-loop refrigeration device and method, and relates to the technical field of hydrogen liquefaction. The device comprises a raw material hydrogen supply system, an ortho-parahydrogen conversion system, a three-loop hydrogen refrigerating system, a liquid hydrogen collecting and supercooling system and a gas recycling system. Wherein the raw material hydrogen is sequentially cooled by the pre-cooling cold box and the multi-stage heat exchanger and then enters the ortho-parahydrogen converter to be converted into parahydrogen, and then the parahydrogen is subjected to flash separation to obtain a liquid hydrogen product. The three-loop refrigerating system adopts three modes of high-pressure hydrogen expansion, medium-pressure liquid hydrogen throttling and low-pressure flash steam recovery to supply cold synergistically, and precise matching of the cold capacity of different temperature zones is achieved. Hydrogen is adopted as a refrigerant, the refrigerant cost is low, the heat exchange temperature difference is reduced through three-loop collaborative refrigeration, the flash evaporation loss is reduced, meanwhile, the system stability and the liquid hydrogen quality are improved through expansion work recovery and full parahydrogen conversion, and the system is suitable for large-scale liquid hydrogen preparation.

The present invention relates to a conductive separator plate with a gas-liquid distribution flow field structure and a processing method thereof, wherein functional partitions such as a sealant wire trough, a guide trough, a gas channel, and a liquid channel are integrated into the same component and formed in one piece. Compared with traditional conductive separator plates, the conductive separator plate of the present invention reduces the number of processing times and the difficulty of processing, so that the manufacturing of the conductive separator plate, the assembly quality of the battery stack, and the positioning accuracy are all guaranteed. The conductive separator plate of the present invention does not require separate reinforcement of the sealant wire trough, and can ensure the operating stability of the electrolytic cell under the condition of producing high-pressure hydrogen (>3.5MPa). Compared with the prior art, the conductive separator plate of the present invention has a simple structure, is easy and reliable to install, reduces the processing steps, and improves the structural reliability.

The invention relates to the technical field of hydrogen energy safety experiments, in particular to a PIV (particle image velocimetry)-based high-pressure hydrogen jet flow and hydrogen-present component coupling visualization system and a PIV-based high-pressure hydrogen jet flow and hydrogen-present component coupling visualization method. The system comprises a hydrogen source, a nitrogen source, a tracer particle containing box, a hydrogen storage tank, a pinhole nozzle, a hydrogen-contacting component, a data acquisition assembly and a processing platform, the hydrogen source and the nitrogen source are communicated with the tracer particle containing box through valves, the hydrogen storage tank is communicated with the tracer particle containing box and the pinhole nozzle, the hydrogen-contacting component directly faces the pinhole nozzle, and the data acquisition assembly is connected with the data acquisition assembly. The pinhole nozzle and the hydrogen-contacting component are both positioned in the experiment module; the data acquisition assembly comprises a foil type resistance strain gauge which is pasted on the side, away from the pinhole nozzle, of the hydrogen-contacting component and a high-speed camera array which is used for shooting movement of tracer particles carried by high-pressure hydrogen jet sprayed from the pinhole nozzle to the hydrogen-contacting component from a plurality of visual angles. According to the invention, the PIV technology is utilized to capture the fluid-structure interaction process between the high-pressure hydrogen jet flow and the hydrogen-contacting component, so that the visual research of the fluid-structure interaction process is realized.

Provided is a polyamide resin composition which has high fluidity and excellent hydrogen barrier properties when formed into a molded article, and which does not impair flexibility in a low-temperature environment. A polyamide resin composition for a molded article that is in contact with high-pressure hydrogen gas, the polyamide resin composition containing (A) an aliphatic homopolymerized polyamide resin, (B) an aliphatic copolymerized polyamide resin, and (C) at least one compound selected from the group consisting of C18-32 fatty acids and derivatives thereof as an optional component, the polyamide resin composition does not substantially contain a polyolefin resin. The relative viscosity of (A) is 1.80-2.70, the relative viscosity of (B) is 2.90-4.20, the relative viscosity of a mixture of (A) and (B) is 2.30-3.60, the total of (A) and (B) is 93.0-100% by mass, (C) is 0-2.0% by mass, and other components are 0-5.0% by mass, and the ratio of (A) to (B) is 50: 50-90: 10 on a mass basis.

The utility model provides a water storage and supply device for an underwater fuel cell system. The water storage and supply device sequentially comprises a high-pressure hydrogen cylinder, a built-in rubber capsule and a shell from inside to outside, the tail end of the high-pressure hydrogen cylinder is sleeved with a round sleeve with a cap, and the head end of the high-pressure hydrogen cylinder is fixedly connected with an air inlet and outlet metal nozzle. The inner side of the tail end of the built-in rubber capsule is in wedge connection with the capped round sleeve, the outer side of the tail end of the built-in rubber capsule abuts against the shell, and the capped round sleeve is fixedly connected with the shell; the inner side of the head end of the built-in rubber bag is in wedge connection with the air inlet and outlet metal nozzle, the outer side of the head end of the built-in rubber bag abuts against the shell, and the metal nozzle locking piece is fixedly connected with the air inlet and outlet metal nozzle and abuts against the shell. A variable gas storage cavity is formed between the built-in rubber bag and the high-pressure hydrogen cylinder, a variable water storage cavity is formed between the shell and the built-in rubber bag, a water outlet is formed in the shell, a low-pressure gas flow channel in the gas inlet and outlet metal nozzle is communicated with the variable gas storage cavity, and a high-pressure gas flow channel in the gas inlet and outlet metal nozzle is communicated with an inner cavity of the high-pressure hydrogen cylinder.