470 results about "High pressure hydrogen" patented technology

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 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 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.

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 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 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 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 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.

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.

The invention discloses a large-duration double-source combined supply emergency security vehicle and a control method thereof.The emergency security vehicle comprises a photovoltaic system, a lithium battery system, a hydrogen production system and a hydrogen storage system, the photovoltaic system is connected with the lithium battery system and the hydrogen production system, and the hydrogen production system is connected with the hydrogen storage system; the lithium battery system comprises a fuel cell and a power lithium battery, and the fuel cell is electrically connected with the power lithium battery; the hydrogen production system comprises a PEM electrolytic bath; the hydrogen storage system comprises a modularized hydrogen cylinder group, the power lithium battery is connected with the PEM electrolytic bath through a DC / DC converter, and the PEM electrolytic bath is connected with the modularized hydrogen cylinder group through a high-pressure hydrogen pipeline; the external hydrogen charging interface is communicated with the modularized hydrogen cylinder group, and the modularized hydrogen cylinder group is communicated with a hydrogen inlet of the fuel cell; the method has the advantages that the power and the cruising ability are improved.

The utility model discloses a hydrogen fuel cell automobile high-pressure hydrogen storage tank pressure energy recovery device which comprises a first-stage hydrogen pressure reduction module, a second-stage hydrogen pressure reduction module, a third-stage hydrogen pressure reduction module and an electric energy storage module which are sequentially connected. The third-stage hydrogen pressure reduction module is communicated with the hydrogen output pipeline; a first hydrogen pressure regulation transmission pipeline is also communicated between the primary hydrogen pressure reduction module and the hydrogen output pipeline; the second-stage hydrogen pressure reduction module is communicated with the hydrogen output pipeline through a second hydrogen pressure regulation transmission pipeline; through the cooperation of the multi-stage hydrogen pressure reduction module and the electric energy storage module, the pressure energy of high-pressure hydrogen in the high-pressure hydrogen storage tank is converted into electrochemical energy to the maximum extent, and the electrochemical energy is stored in the storage battery, so that the waste of the pressure energy in the high-pressure hydrogen storage tank is avoided, and the energy utilization efficiency of the fuel cell automobile is improved; and the comprehensive energy consumption of the automobile is reduced.

The invention relates to a novel frame for a PEM electrolysis cell and for a PEM electrolysis cell stack. The subject matter of the invention is the frame, a PEM electrolysis cell and stack-type PEM electrolysis devices, which comprise the frame according to the invention, preassembled components and methods for producing preassembled components and stack-type PEM electrolysis devices. The frame, PEM electrolysis cell and stack-type PEM electrolysis devices according to the invention are suitable for generating high-pressure hydrogen in combination with the use of thin proton exchange membranes. The invention is based on a novel frame- and sealing-concept. The invention also relates to a cover for stack-type PEM electrolysis devices.

The invention discloses a high-pressure sealing ball valve for hydrogen, and relates to the technical field of ball valves, the high-pressure sealing ball valve comprises a first valve body and a second valve body, the first valve body and the second valve body are detachably and fixedly connected, and a sealing ring is arranged at the joint of the first valve body and the second valve body; the second valve body fixedly communicates with a valve seat, a valve rod is rotationally arranged in the valve seat, and a valve opening and closing mechanism is jointly installed between the first valve body and the second valve body. The valve has the advantages that pressure self-adaptive adjustment and dynamic adaptation to working condition fluctuation are achieved through opening, closing and sealing actions, excessive abrasion of components is avoided while sealing reliability is guaranteed, the instantaneous leakage risk of a traditional valve in the opening and closing stage is reduced, meanwhile, impact damage and operation resistance of the components are remarkably reduced by means of multiple buffering structures and friction optimization, and the service life of the valve is prolonged. The operation and maintenance convenience of equipment is improved, the service life is effectively prolonged, and the harsh working condition requirement of high-pressure hydrogen conveying is met.

The utility model relates to the technical field of coal chemical industry, in particular to a device for simulating scaling stability in a coal-oil slurry transportation process. Comprising a coal-oil slurry stirring tank connected with a high-pressure hydrogen pipe, the coal-oil slurry stirring tank is connected with one end of a simulation conveying pipe through a feeding pipe, the other end of the simulation conveying pipe is connected with a coal-oil slurry buffer tank through a discharging pipe, the coal-oil slurry buffer tank is connected with the coal-oil slurry stirring tank through a circulating pipe, and a coal-oil slurry circulating pump is arranged on the circulating pipe; an oil-coal-slurry conveying pump is arranged on the feeding pipe, the feeding pipe is connected with a plurality of feeding branch pipes, each feeding branch pipe is provided with a branch pipe valve and a branch pipe flowmeter, the discharging pipe is connected with a plurality of discharging branch pipes, and the two ends of a plurality of simulation conveying pipes with different inner diameters are connected with the feeding pipe and the discharging pipe through the feeding branch pipes and the discharging branch pipes respectively. A plurality of pressure gauges are arranged on the simulation conveying pipe at intervals, and a heat tracing sleeve is arranged outside the simulation conveying pipe. The device is reasonable in structural arrangement, and is favorable for mastering the scaling risk of the coal-oil slurry in advance in the production process so as to carry out response treatment in time.

The invention discloses a treatment process method for improving the strength and plasticity of a hydrogen isolation diaphragm and the hydrogen isolation diaphragm. The treatment process method comprises the following steps: S1, carrying out high-frequency vibration and static pressure coupling treatment on the hydrogen isolation diaphragm; and S2, the hydrogen isolation diaphragm is subjected to snakelike line rolling treatment. The hydrogen isolation diaphragm is treated by the treatment process method. According to the treatment process method, high-frequency vibration and static pressure coupling treatment is carried out on the hydrogen isolation diaphragm, and a gradient nanostructure and residual compressive stress are introduced into the surface layer of the hydrogen isolation diaphragm, so that the strength and plasticity of the hydrogen isolation diaphragm are remarkably improved, and the hydrogen embrittlement sensitivity is reduced; therefore, the service life of the hydrogen isolation diaphragm in the high-pressure hydrogen diaphragm compressor is prolonged, and the safety and reliability of equipment are improved.

The invention discloses a bio-oil enhanced hydrodenitrogenation method, which comprises the following steps: adding bio-oil, a catalyst, formic acid and deionized water into a reaction kettle, uniformly stirring to obtain a mixed solution, continuously stirring for reaction, and after the reaction is finished, carrying out suction filtration and distillation to obtain reformed bio-oil. The preparation method of the catalyst comprises the following steps: mixing corn straw and ammonium molybdate, adding deionized water after mixing, stirring and dipping, and then carrying out vacuum drying and calcining to obtain the catalyst. In the catalytic reforming process, formic acid is innovatively introduced to serve as a hydrogen source, the gas-liquid interface transmission resistance of a traditional gaseous hydrogen source is eliminated through the homogeneous hydrogen supply characteristic of liquid formic acid, the flammable and explosive risk of high-pressure hydrogen is avoided, the process safety is improved, meanwhile, formic acid is subjected to in-situ decomposition on the surface of the catalyst to generate active hydrogen species, and the catalytic reforming efficiency is improved. And a synergistic catalysis mechanism is formed with a platinum-like active site of the catalyst, so that the kinetic advantage of the hydrodenitrification reaction is enhanced, and an efficient, safe and environment-friendly bio-oil hydrodenitrification process system is constructed.

The invention provides a device and a method for reducing exhaust loss by using the pressure of a liquid hydrogen storage tank, and relates to the technical field of liquid hydrogen storage and transportation safety. The device comprises an adsorption storage assembly, a desorption recovery assembly and an adsorption enhancement assembly which are arranged in a gas pillow of the liquid hydrogen storage tank. The adsorption and storage assembly is communicated with the air pillow through a one-way mechanical low-temperature valve, is internally provided with a solid adsorption material and a vacuum heat insulation cylinder, and is used for adsorbing and storing evaporation gas and reducing the tank pressure when the tank pressure is increased; the adsorption enhancing assembly comprises a low-temperature hydrogen regulating valve and a low-temperature heat exchanger, and the throttling effect of high-pressure hydrogen in the tank is used for refrigerating an adsorption material, so that the adsorption capacity of the adsorption material is improved; the desorption recovery assembly heats an adsorption material through an intermediate heater, and controllable release of hydrogen is achieved. According to the invention, the active management of the pressure of the liquid hydrogen storage tank and the efficient recovery of the boil-off gas are realized, the exhaust period is obviously prolonged, the hydrogen loss is reduced, and the storage and transportation economy and safety are improved.

The invention discloses an operation method and system of a liquid-gas dual-mode liquid hydrogen refueling station, the system realizes the switching of a refueling route through a plurality of liquid hydrogen control valves and a control switch of a gas hydrogen control valve, liquid hydrogen output from a liquid hydrogen storage tank is primarily pressurized through a first liquid hydrogen booster pump, and in the liquid hydrogen refueling route, the liquid hydrogen output from the liquid hydrogen storage tank is pressurized through a second liquid hydrogen booster pump. The liquid hydrogen pressurized for the first time is in a supercooled state and is not easy to evaporate, the generation of BOG is greatly inhibited, the leakage amount of the liquid hydrogen in a liquid-liquid filling process can be reduced, the filling efficiency is improved, in a high-pressure hydrogen filling route, the liquid hydrogen in a supercritical state can also effectively reduce the cavitation problem of a pump during secondary pressurization, waste of liquid hydrogen cold energy is reduced, and the production cost is reduced. High volume efficiency can be effectively guaranteed, and durability of equipment and efficient operation of the hydrogen refueling station are guaranteed.

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 application relates to the technical field of steel production, in particular to a hydrogen embrittlement resistant pipeline steel and a preparation method and application thereof. The metallographic structure of the pipeline steel comprises a tempered sorbite structure and nano precipitate particles; the tempered sorbite structure comprises a ferrite matrix and carbide; the grain size of the ferrite is greater than or equal to 10 levels, and the volume fraction of the carbide is less than or equal to 10%; the diameter of the nano precipitate particles is less than or equal to 20 nm. The application solves the technical problem that the existing pipeline steel is prone to hydrogen damage in a high-pressure hydrogen environment, avoids the contradiction between high strength and hydrogen embrittlement resistance, and makes the hydrogen conveying pipeline steel have high strength, high toughness, low hardness and excellent hydrogen embrittlement resistance, so that the hydrogen conveying pipeline steel can meet the use requirements of high-pressure (greater than or equal to 10 MPa) hydrogen conveying.

The utility model discloses a metal material constant load testing device suitable for a hydrogen environment, which comprises a high-pressure gas storage bin, the high-pressure gas storage bin is hermetically connected with an upper bin cover and a lower bin cover, the upper bin cover is provided with a gas inlet pipeline, the lower bin cover is provided with a gas outlet pipeline, the high-pressure gas storage bin is filled with hydrogen, the upper bin cover is provided with an upper loading rod, and the lower bin cover is provided with a lower loading rod. The upper end of an upper loading rod is connected with a loading head, the lower end of the loading rod extends into the high-pressure gas storage bin, a load sensor is installed on the upper loading rod, a lower loading rod is arranged on the lower bin cover, the upper end of the lower loading rod extends into the high-pressure gas storage bin, the lower end of the lower loading rod is connected with a base, the lower end of the upper loading rod is provided with an upper connector, and the upper connector is connected with a lower connector. A lower connector is arranged at the upper end of the lower loading rod, a constant-load sample is connected between the upper connector and the lower connector, an extensometer is mounted on the constant-load sample, and a temperature sensor and a pressure sensor are mounted in the high-pressure gas storage bin. According to the utility model, a high-pressure hydrogen test environment can be effectively provided, and the performance test of a metal material under a constant load is realized.

To produce high-purity, high-pressure hydrogen while aiming to improve energy efficiency.SOLUTION: An electrolysis system includes: an electrolysis module comprising a solid oxide electrolytic cell that produces hydrogen by water vapor electrolysis and a thermal insulation housing container that accommodates the electrolytic cell; a water vapor feed line that supplies water vapor to the electrolytic cell; and an electrochemical pump accommodated in the housing container. The electrochemical pump has a pump cell including a solid electrolyte, an anode, and a cathode, and is connected to the electrolytic cell so as to direct off-gas containing hydrogen produced in the electrolytic cell and unreacted water vapor into the inlet of the anode. The electrochemical pump is connected to a hydrogen recovery line to output pressurized hydrogen from the cathode outlet to the outside of the housing container, and is connected to a hydrogen supply line to output the remaining hydrogen and water vapor from the anode outlet to the water vapor feed line inside the housing container.SELECTED DRAWING: Figure 1

The invention discloses a manufacturing method of high-sulfur, high-strength and free-cutting 316L stainless steel for a high-pressure hydrogen energy pipe connecting piece. The manufacturing method comprises the following steps: smelting and forging according to design components to obtain a bar; preheating is conducted at the temperature of 800-950 DEG C, primary induction heating, chambering and secondary induction heating are conducted at the temperature of 1100-1150 DEG C, hot extrusion is conducted at the temperature of 1000-1150 DEG C to form a round pipe, and slow cooling is conducted; the extruded round pipe is subjected to solution treatment at the temperature of 1010-1080 DEG C, heat preservation is conducted for 1 h, and then acid pickling and finishing are conducted; the round pipe is subjected to cold rolling, the size phi of the round pipe subjected to secondary cold rolling is 22 mm, and the thickness of the round pipe is 5 mm; and finally cold drawing is circulated, and the final size of the obtained circular pipe is phi 20 mm and the thickness is 5 mm. The performance of the manufactured 316L pipe connecting piece is as follows: the tensile strength is larger than or equal to 830 MPa, the yield strength is larger than or equal to 680 MPa, the ductility is larger than or equal to 20%, and the HRC is smaller than or equal to 30. And the use condition of the high-pressure hydrogen energy pipe connector can be met.

The invention discloses an experimental device for testing the performance of a liquid hydrogen valve, and relates to the technical field of refrigeration and low-temperature engineering. Comprising a low-temperature medium storage system, a high-pressure purified gas storage device, a temperature measurement system, a valve test module, a vacuumizing device, a rewarming device, a gas recovery system, a leakage rate measurement system and a data acquisition system, and the low-temperature medium storage system is used for storing a low-temperature cooling medium. The temperature zone of the liquid helium can cover the liquid hydrogen, the safety of the liquid helium is far higher than that of the liquid hydrogen, the test safety is improved, the supply of the low-temperature medium can be accurately controlled, the reliable test of the valve at the preset temperature is ensured, the test requirement of the temperature range of 20K-300K is met, the application range is wider, and the application range is wider. The valve testing device can support a low-temperature environment from 20K to 300K, provides a high-pressure hydrogen condition, and meets various valve testing requirements.

The invention discloses a vibration suppression hydrogen valve. A vibration mode is monitored in real time through a high-precision acceleration sensor array, an anti-phase excitation signal is generated through a self-adaptive control algorithm, mechanical resonance caused by high-pressure hydrogen flow is suppressed, the vibration amplitude is reduced, the service life of the valve is prolonged, and meanwhile, noise and energy loss of a hydrogen system are reduced. The vibration mode is monitored in real time through the high-precision acceleration sensor array, an anti-phase excitation signal is generated through a self-adaptive control algorithm, mechanical resonance caused by high-pressure hydrogen flowing is restrained, the vibration amplitude is reduced, the service life of a valve is prolonged, and meanwhile the noise and energy loss of a hydrogen system are reduced.

The present invention provides a method for preparing a high-strength, hydrogen-damage-resistant medium-entropy alloy, a medium-entropy alloy, and its application, belonging to the technical field of metal alloy materials. The method comprises the following steps: 1) weighing Cr, Co, Ni, Mo, and W by atomic percentage, uniformly mixing, smelting, and casting to obtain an alloy ingot A; 2) subjecting the alloy ingot A described in step 1) to a high-temperature solution heat treatment to obtain an alloy ingot B; 3) rolling the alloy ingot B described in step 2) to obtain a rolled sample; and 4) subjecting the rolled sample described in step 3) to a recrystallization heat treatment to obtain a medium-entropy alloy. The method of the present invention, which utilizes W and Mo alloying to optimize the yield strength and hydrogen embrittlement resistance of a Cr-Co-Ni-based medium-entropy alloy, has the advantages of a wide composition range and an easy-to-operate preparation method. The prepared Cr-Co-Ni-W-Mo-based medium-entropy alloy has high strength and excellent resistance to high-pressure hydrogen damage.