411 results about "Hydrogen permeation" patented technology

The invention relates to the technical field of new energy pipelines, in particular to an anti-cracking hydrogen-doped pipeline system and a performance degradation monitoring method thereof. The hydrogen-doped pipeline system comprises a pipeline assembly, a supporting assembly, an operation assembly, a power assembly, a storage battery pack, a system control cabinet and a power generation assembly, the phenomena of hydrogen permeation and gas stratification are effectively inhibited through innovative pipeline structure design and material optimization in the system level, the hydrogen embrittlement risk is reduced from the source, and the energy consumption is reduced. According to the method, the hydrogen atom diffusion tracking and crack initiation prediction are combined, and a multi-scale collaborative monitoring system is constructed, so that the whole-process monitoring from hydrogen atom diffusion tracking to crack initiation prediction is realized, and particularly, a quantum dot marking technology is combined with a traditional sensing network, so that the service life of the pipeline can be effectively prolonged, and the reliability and the maintenance efficiency of safety monitoring are improved.

Provided is a fuel cell aging prediction method, a system thereof and a medium. The method includes the following steps: acquiring operation parameters and calculation parameters of a fuel cell corresponding to each historical moment in a historical time period, where the calculation parameters include a stack voltage, active area and a hydrogen permeation current; carrying out calculation based on the calculation parameters corresponding to the historical moment to obtain a mixed aging index corresponding to the historical moment; taking the operation parameters and the mixed aging index corresponding to each historical moment in the historical time period as inputs, and predicting the mixed aging index corresponding to the prediction moment by a mixed aging index prediction model.

The invention belongs to the field of safe service of hydrogen conveying pipelines, and provides a method for controlling local hydrogen enrichment of a hydrogen conveying pipeline girth welding joint, which provides support for hydrogen embrittlement failure risk management and control of a related hydrogen conveying pipeline girth welding joint area, and comprises the following steps of: establishing a three-dimensional finite element model of the hydrogen conveying pipeline girth welding joint in a ratio of 1: 1 by utilizing ABAQUS simulation software; sequentially calculating a temperature field and a stress field of the ring welding joint; hydrogen permeation parameters of the pipeline base metal and the ring welding joint are obtained through a gas phase hydrogen permeation test; by taking the obtained hydrogen permeation parameters as initial conditions and a stress field as boundary conditions, calculating a full-size hydrogen distribution cloud chart of the ring welding joint of the hydrogen conveying pipeline; local heat treatment is conducted on the ring welding joint, the influence of heat treatment on hydrogen distribution of the full-size pipeline ring welding joint is simulated and calculated, and an optimization strategy for controlling local hydrogen enrichment of the ring welding joint is provided. According to the method, the stress distribution of the ring welding joint is uniform, so that the local hydrogen enrichment degree of the ring welding joint of the hydrogen conveying pipeline is effectively controlled, and the risk of hydrogen induced cracking of the ring welding joint is reduced.

The invention relates to the technical field of computer-aided engineering, in particular to an integrated design method for a three-dimensional simulation model of spare and accessory parts. The method comprises the following steps: obtaining a part structure drawing, and carrying out part interference analysis to obtain part interference data; reconstructing an assembly path according to the part interference data to obtain assembly path data; constructing a part three-dimensional simulation model according to the assembly path data; performing fatigue simulation according to the three-dimensional simulation model of the spare part to obtain fatigue life data; performing fracture area analysis based on the fatigue life data to obtain part fracture area data; performing grain boundary cracking detection according to the part fracture area data to obtain grain boundary cracking data; and performing grain boundary hydrogen permeation detection according to the grain boundary cracking data to obtain grain boundary hydrogen permeation data. Based on the computer-aided engineering technology, the accuracy of part structure design and the reliability of service life prediction are improved.

The invention discloses a safety type damaged state rock hydrogen permeation simulation device and method.The simulation device comprises a box body, a simulation mechanism, a hydrogen injection mechanism and an explosion-proof mechanism, and the simulation mechanism comprises a pressure box, a lower cushion block, a thermal shrinkage sleeve, an upper pressing block, an axial pressure assembly and a confining pressure assembly; and the hydrogen injection mechanism is communicated with the gas inlet hole and the gas outlet hole and is used for injecting gas with preset gas pressure and preset hydrogen concentration into the thermal shrinkable sleeve. The device has the beneficial effects that gas with preset pressure and preset hydrogen concentration is continuously injected into the rock sample in the thermal shrinkable sleeve through the hydrogen injection mechanism, the influence of different hydrogen environments on rock mechanical properties can be simulated, meanwhile, the first hydrogen concentration detection piece continuously monitors the hydrogen concentration in the box body, and if the concentration exceeds a preset safety threshold value, the hydrogen concentration is detected. And the fan is immediately started, and hydrogen in the box body is discharged to an outdoor safe area, so that explosion accidents caused by hydrogen leakage can be avoided, and the safety of an experiment process is improved.

The present invention relates to a membrane electrode for reducing the hydrogen content in oxygen of a PEM water electrolyzer and a preparation method thereof, by simply adding an organic silicone resin solution in the cathode catalyst slurry preparation process, changing the mass transfer and transfer from the catalyst layer to the porous transmission layer after hydrogen is generated in the test process, reducing the hydrogen flux of hydrogen permeating from the cathode to the anode, and thus reducing the hydrogen content in oxygen. The present invention has the advantages of low preparation cost, simple process and easy operation, and excellent performance.

The preparation method of the aluminum oxide hydrogen-resistant coating on the zirconium hydride surface disclosed by the embodiment of the invention comprises the following steps: S1, plating aluminum on the surface of a zirconium hydride matrix in a magnetron sputtering manner, and forming an aluminum film on the surface of the zirconium hydride matrix; and S2, the aluminum film formed on the surface of the zirconium hydride matrix is subjected to micro-arc oxidation to obtain aluminum oxide, and the aluminum oxide hydrogen-resistant coating is obtained. Wherein an aluminum oxide film layer formed on the surface of zirconium hydride is tightly combined with a zirconium hydride matrix, and the thickness of the film layer is 5-80 microns; the aluminum oxide film layer is composed of an inner compact layer with a non-porous structure and an outer loose layer with a closed pore structure, the thickness of the compact layer is 2-15 microns, and the compact layer has a good hydrogen permeation resistance effect; the aluminum oxide film layer on the surface of zirconium hydride can serve as an aluminum oxide hydrogen-resistant coating, the hydrogen-resistant capacity of the zirconium hydride moderator is improved, and the service life of the zirconium hydride moderator is prolonged.

A full-size PE pipeline hydrogen permeation and aging test integrated device disclosed by the present invention comprises a high-temperature aging oven, supporting plates are fixedly installed at the two ends of the bottom of an inner cavity of the high-temperature aging oven, sealing mechanisms for testing are arranged at the tops of the supporting plates, and PE pipe bodies are arranged on the inner side walls of the sealing mechanisms; through cooperative arrangement of the high-temperature aging oven, the sealing mechanism, the air intake and exhaust mechanism, the pressure reading instrument and the gas chromatograph, the hydrogen permeability of the full-size PE pipeline can be tested, and meanwhile, an aging test can be carried out in a hydrogen environment, so that the test effect is improved, and the test cost is reduced. The device has the advantage that the hydrogen permeability coefficient of hydrogen-doped natural gas in the PE pipeline can be measured through a gas chromatograph, so that the requirements of scientific research and engineering application are met, the sealing operation during testing is realized by utilizing the sealing mechanism, and the air intake and exhaust mechanism is used for realizing the air intake and exhaust operation during testing; and the pressure reading instrument and the gas chromatograph are used for analyzing and recording the obtained data.

To provide a hydrogen ion conductive multi-layer composite membrane having excellent durability, ion conductivity, and hydrogen permeation reduction effect.SOLUTION: The present invention provides a hydrogen ion conductive multilayer composite membrane comprising: inner reinforced membranes comprising a porous PTFE layer impregnated with an ionomer composition and outer reinforced membranes positioned on both sides of the inner reinforced membrane, wherein the outer reinforced membranes comprise a porous PTFE layer impregnated with an ionomer composition.SELECTED DRAWING: Figure 1

The invention discloses a SiO2 / alpha-Al2O3 composite hydrogen-resistant coating for a hydrogen conveying pipeline and a preparation method of the SiO2 / alpha-Al2O3 composite hydrogen-resistant coating, and belongs to the technical field of hydrogen resistance of hydrogen conveying pipelines. The composite hydrogen-resistant coating disclosed by the invention is of a sandwich composite structure of a base material, namely SiO2-alpha-Al2O3; a radio frequency magnetron sputtering method is adopted, the composite coating with the related thickness is flexibly prepared by controlling parameters, the preparation method is simple and easy to implement, the preparation cost is low, and according to related experimental results, it is proved that the obtained SiO2 / alpha-Al2O3 composite hydrogen resistance coating for the hydrogen conveying pipeline is compact in structure, bonding between a base material and SiO2 and between SiO2 and alpha-Al2O3 interfaces is tight, and the film-substrate bonding force is 8.5 N; the hydrogen permeation activation energy is 146.2-177.9 kJ. / mol, the hydrogen permeation pressure index is 0.73-0.91, the problems of hydrogen permeation and hydrogen embrittlement of the hydrogen conveying pipeline can be greatly solved, and the service safety of the hydrogen conveying pipeline is guaranteed.

The invention relates to the technical field of hydrogen permeation membranes, in particular to a porous metal tube loaded high-entropy alloy hydrogen permeation membrane as well as a preparation method and application thereof. The preparation method comprises the steps that under the inert atmosphere, molybdenum and copper are subjected to mixed ball milling, then cobalt, chromium, iron and nickel are added for mixed ball milling, molybdenum and copper doped cobalt, chromium, iron and nickel high-entropy alloy powder is obtained, then the molybdenum and copper doped cobalt, chromium, iron and nickel high-entropy alloy powder is sprayed to the surface of a porous metal pipe through a supersonic speed hot spraying film making method, and the porous metal pipe is obtained. And a film layer is formed, and the porous metal tube loaded high-entropy alloy hydrogen permeation film is prepared. The high-entropy alloy hydrogen permeation membrane is high in corrosion resistance and suitable for extracting hydrogen from coke oven gas containing much sulfur / carbon impurity gas, and the problems that a conventional compact metal hydrogen permeation membrane is poor in sulfur / carbon resistance and thermal stability are solved.

The invention belongs to the technical field of petroleum refining, and relates to a high-purity hydrogen recovery process for improving denitrification efficiency based on a PSA (Pressure Swing Adsorption) device, which comprises the following steps: carrying out primary adsorption impurity removal after pretreatment and pressure regulation on raw material gas, carrying out gas-liquid separation, pretreatment and pressure regulation on the obtained hydrogen-rich gas, and then carrying out membrane separation; the generated hydrogen-rich permeated gas is subjected to pressure regulation and then is sequentially input into a second-stage PSA device and a third-stage PSA device for further adsorption and purification, and finally finished hydrogen with the purity not lower than 99.9% is obtained. The membrane separation technology is adopted for selective separation of hydrogen and nitrogen, the membrane separation unit is arranged at the outlet of the first-stage PSA device, nitrogen is removed from the source, meanwhile, desorbed gas of the third-stage PSA device and retention gas of the membrane separation unit are combined for combustion, nitrogen accumulation in the system is avoided, the nitrogen circulation amount in the system is reduced, and the energy consumption of the system is reduced. The hydrogen recovery rate can be effectively improved while the adsorption efficiency is improved, the process is simple, the investment cost is low, the implementation period is short, and remarkable economic benefits and process advantages are achieved.

The invention discloses a device for measuring an electrochemical hydrogen permeation curve under a cross tensile load based on feedback compensation, and aims to solve the problems that in the prior art, the hydrogen permeation curve of a sample under the cross tensile load cannot be measured, and relaxed stress cannot be compensated during measurement. The device for measuring electrochemical hydrogen permeation under the cross tensile load based on feedback compensation comprises a circular bracket, a stress sensor, a ball joint tensile arm, a clamping assembly, a motor torque-axial force conversion assembly, a PC (Personal Computer), an electrochemical workstation and a sample, the method is applied to the field of electrochemical hydrogen permeation testing.

The invention relates to the technical field of hydrogen energy conveying and material performance testing, in particular to a testing structure for hydrogen permeation testing in a high-pressure gas-phase hydrogen environment and an installation method and application of the testing structure. The testing structure comprises a sample body and an insulation sealing assembly, and the sample body is of a double-step disc structure; the uppermost edge of the first sealing insulation assembly is flush with the upper end face of the cylindrical platform, the sample body is installed on the inner side of the first sealing insulation assembly in a matched mode, the second sealing insulation assembly is in a shape with an upward opening, and the first sealing insulation assembly is installed in the second sealing insulation assembly in a matched mode. The test surface of the sample body of the test structure and the gas main flow keep a consistent flow velocity field, and when the test structure is used for testing, the permeation behavior of the hydrogen flow on the material surface can be truly reflected; all the clamping and conducting structures are arranged outside the pipe wall of the test pipeline or at the left part of the sample body, so that flow field disturbance is prevented from being introduced into a main airflow path.

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 hydrogen-corrosion-resistant coating material for a hydrogen-rich electrolyte environment and a preparation method thereof, and relates to the technical field of hydrogen-corrosion-resistant coating materials, the coating material comprises the following components by weight: a metal matrix reinforcing material: 30%-50% of nickel and 5%-10% of cobalt; the ceramic particles comprise 10%-20% of aluminum oxide and 5%-15% of The coating material disclosed by the invention shows excellent corrosion resistance, wear resistance and hydrogen embrittlement resistance in a hydrogen-rich electrolyte environment. The nickel-cobalt alloy layer is kept stable at high temperature and high pressure, hydrogen permeation is blocked, and material degradation is prevented. Aluminum oxide and silicon carbide improve the hardness and wear resistance of the coating, and the coating is kept intact in temperature circulation. The rare earth elements yttrium oxide and cerium oxide enhance the oxidation resistance and hydrogen embrittlement resistance. And the dispersing agent and the cross-linking agent further improve the uniformity, compactness and adhesion of the coating, so that the coating is suitable for industrial parts in high-pressure and high-stress environments.

According to the efficient and powerful cleaning system and method for the stainless steel cold-rolled steel strip, through cooperation of an electrolytic cleaning unit (the current density is 18-200 A / dm < 2 >), a multi-stage coupling unit (alkali spraying, electrolysis, high-pressure water scrubbing and air purging) and a dynamic control unit (current self-adaption based on roughness Rz), the efficient and powerful cleaning of the stainless steel cold-rolled steel strip is achieved; the oil stain stripping rate is not less than 99%, the hydrogen permeation amount is reduced by 67%, the residual alkali liquor is not more than 0.5 g / m < 2 >, and Ra is not more than 0.5 mu m. And the current efficiency is improved to 85% by adopting a bipolar electrode and a vertical injection design, the surface quality is strengthened by combining a hydrophobic roller and passivating treatment, and the device is suitable for high-speed continuous production.

A high-pressure flow-circulating hydrogen permeation test device and method, including: a base, and an autoclave body and a compressor being fixedly arranged on the base, wherein a side wall of the autoclave body is fixedly provided with a sample clamp, a first end of the sample clamp is clamped with a sample and extends into the interior of the autoclave body, a second end of the sample clamp is fixedly provided with a hydrogen permeation test device, an interior of the sample clamp is communicated with the hydrogen permeation test device, the hydrogen permeation test device contains an electrolyte in contact with the sample, and a gas inlet and a gas outlet of the autoclave body are both connected with the compressor through pipelines.

The invention relates to the technical field of gas permeability testing, in particular to a method and device for measuring the hydrogen permeation rule of nonmetal in the thickness direction, and the device comprises a first supporting seat, a hydrogen filling tank, a sample, a hydrogen measuring hose, a hydrogen concentration detector, a second supporting seat, a hydrogen filling hole, a pressure relief hole, a detection hole, an exhaust window and a sealing O-shaped ring; hydrogen is charged through a hydrogen charging hole in one side of the hydrogen charging tank, the hydrogen permeates in the thickness direction of the sample according to the concentration gradient, and the hydrogen permeates into a detection hole and then enters a hydrogen concentration detector through a hydrogen measuring hose; the device can be used for measuring the hydrogen permeation rule of nonmetal in the thickness direction, and provides experimental support for related hydrogen permeation simulation, so that a basis is provided for research, development and selection of nonmetal materials of a hydrogen conveying system.

The invention provides an application of a composite coating formed by titanium oxide and chromium oxide in hydrogen resistance, which comprises the following steps: substrate preparation: cutting a metal sample into a metal substrate, pretreating the surface of the metal substrate, polishing, cleaning and drying; cr2O3-10% TiO2 composite powder is adopted, the composite powder is heated to be in a molten or molten state, and under traction of plasma high-speed flame flow, the composite powder impacts the surface of the base body in an accelerated mode and deposits to form the ceramic coating. According to the application of the composite coating formed by the titanium oxide and the chromium oxide in hydrogen resistance, the hydrogen permeation current is reduced, so that the hydrogen resistance of the coating is enhanced.

The invention discloses an anti-hydrogen-permeation composite coating for a hydrogen conveying pipeline and a preparation method of the anti-hydrogen-permeation composite coating, and belongs to the field of physically modified metal corrosion prevention. The method comprises the following steps: step 1, firstly weighing quantitative silicon carbide powder, silicon carbide fiber and modified silicon carbide powder, adding a dispersing agent for dispersing, and uniformly stirring under the action of magnetic stirring; step 2, adding quantitative organic resin and a curing agent thereof in the step 1, further stirring uniformly, defoaming under a vacuum condition, and removing bubbles and a dispersing agent therein; and thirdly, the steel plate is pretreated, then the steel plate is evenly coated with the coating, and the stable coating can be obtained through normal-temperature curing and heating curing. The preparation method of the coating is easy to operate, low in cost and high in hydrogen permeability resistance, the service life of the hydrogen conveying pipeline can be effectively prolonged, and the hydrogen conveying efficiency and the pipeline safety are improved.

The invention relates to a material performance testing technology in a hydrogen environment, and aims to provide a method for acquiring the surface hydrogen concentration of a hydrogen permeation sample by considering a hydrogen trap effect. Comprising the following steps: performing multiple groups of hydrogen permeation experiments on a to-be-tested material; fitting a hydrogen permeation curve by using test data to obtain steady-state hydrogen permeation current density and hysteresis diffusion time under different conditions, and calculating the lattice hydrogen concentration of the hydrogen-filled surface; calculating the hydrogen trap density based on the progressive analysis curve of the hydrogen diffusion kinetic equation and the lattice hydrogen diffusion coefficient of the to-be-detected material; calculating the hydrogen trap binding energy of the to-be-tested material according to a thermal desorption spectrum experiment result; and establishing a balance relationship between lattice hydrogen concentration and trap hydrogen concentration, and obtaining a concentration distribution rule in the hydrogen diffusion direction and the hydrogen concentration on the hydrogen charging surface during steady-state diffusion. According to the method, the nonlinear effect, caused by the hydrogen trap effect in the hydrogen permeation process, of hydrogen distribution in the material during steady-state hydrogen diffusion is considered, and the hydrogen concentration on the surface of the hydrogen permeation experiment material can be obtained more accurately.

The invention belongs to the technical field of hydrogen sulfide stress corrosion resistance detection of oil well pipes, and particularly relates to a method for testing the influence of anodic dissolution in saturated hydrogen sulfide on stress corrosion fracture of an oil well pipe, which comprises the following steps: respectively carrying out slow strain rate tensile tests in a saturated hydrogen sulfide environment and a nitrogen environment to obtain a stress-strain curve of an oil well pipe sample; measuring a hydrogen permeation curve of the oil well pipe sample in the saturated hydrogen sulfide environment; carrying out fast and slow sweep potential polarization curve test and hydrogen permeation curve test on the oil well pipe, and carrying out hydrogen charging-slow stretching test on the oil well pipe under the cathode hydrogen charging potential corresponding to the steady-state hydrogen permeation current density; and according to the damage degree of the saturated hydrogen sulfide environment to the mechanical properties of the oil well pipe, the minimum influence degree of hydrogen in the saturated hydrogen sulfide environment to the stress corrosion fracture of the oil well pipe is determined by combining the damage degree of hydrogen separated out from the cathode reaction to the mechanical properties of the oil well pipe. The device has the advantages of simplicity in operation and accurate measurement result.

The invention relates to the field of composite materials, and discloses a composite coating as well as a preparation method and application thereof, and raw materials for preparing the composite coating comprise epoxy resin, carboxyl-terminated liquid nitrile rubber, a polyurethane prepolymer, a hydrophobic material and a hydrogen-resistant material. The method for preparing the composite coating comprises the following steps: (1) mixing epoxy resin, carboxyl-terminated liquid nitrile rubber, a diluent and a polyurethane prepolymer to obtain a mixed solution; (2) mixing a hydrophobic material, a hydrogen-resistant material and the mixed solution to obtain a dispersion solution; and (3) mixing the dispersion liquid with a curing agent. The composite coating disclosed by the invention can be used for retarding the occurrence of a metal hydrogen embrittlement phenomenon by inhibiting remarkable hydrogen permeation.

The invention relates to the technical field of natural gas transportation safety, in particular to a hydrogen embrittlement risk online monitoring system and method for a hydrogen-doped natural gas pipeline based on multi-parameter fusion, and the system comprises a sentry sensing unit which adopts a metal short pipe which is the same as a to-be-monitored hydrogen-doped natural gas main pipeline in property, material, process, wall thickness and service history, an internal circulating medium is kept consistent with the main pipeline; the risk sensor is provided with a multi-parameter sensor to obtain risk sensing parameters including hydrogen permeation current, pipe wall micro-strain and temperature signal parameters; the signal processing unit is connected with the sentry sensing unit, receives the risk sensing parameters and analyzes and generates hydrogen embrittlement risk indexes through a risk analysis model; and the risk warning unit is connected with the signal processing unit, and triggers a danger prompt signal when the hydrogen embrittlement risk index is greater than a preset safety index. The method has the effect of meeting the danger monitoring effectiveness of safe operation of the hydrogen-doped natural gas pipeline.

The invention provides a high-pressure-resistant low-permeability hydrogen rubber sealing material and a preparation method thereof, and the sealing material comprises the following components by weight: 100 parts of ethylene propylene rubber; 4-8 parts of an active agent; 1-3 parts of an anti-aging agent; 20 to 50 parts of a nanometer material; 50 to 60 parts of a filling reinforcing agent; 2-5 parts of a coupling agent; 3-4 parts of a vulcanizing agent dicumyl peroxide; 1 to 2 parts of trialkenyl triisourea serving as an auxiliary vulcanizing agent; 3-8 parts of vulcanized resin; the invention also provides a preparation method of the high-pressure-resistant low-permeability hydrogen rubber sealing material. The preparation method comprises the following steps: pre-mixing, feeding and mixing, adding cross-linking components, standing and curing, hot-pressing and vulcanizing, post-curing and the like. The sealing material disclosed by the invention realizes high-level balance in the aspects of hydrogen permeation barrier, high-pressure burst resistance, wide-temperature interval tolerance and the like, and can effectively meet the sealing requirements of a hydrogen storage system and a high-pressure hydrogen conveying pipeline of a current hydrogen fuel automobile; the material has great advantages in the aspects of raw material cost, manufacturing process and performance stability.

Compositions and processes for forming barrier coatings to prevent hydrogen embrittlement of an underlying material are disclosed. The coating can be made up of composite structures of metal and oxide that are alternately deposited onto a substrate for creating a multilayer coated substrate. Such multilayer coating can be incorporated into many contexts in which hydrogen permeation prevention is desired, such as pipelines and manufacture of advanced automotive steels. The process involves depositing a metal layer onto the substrate followed by a metal oxide layer thereon. The interface of the metal layer and the oxide layer can form space-charge zones that decrease hydrogen permeability therethrough.

The invention discloses a hydrogen pipe permeation testing system and method. The hydrogen pipe permeation testing system comprises a hydrogen permeation collecting device, a testing pipeline, a temperature adjusting module, a hydrogen supply module, an air exhaust module, a humidifying module and a circulating power element. The hydrogen permeation collecting device is used for installing a detected hydrogen pipe so as to collect hydrogen permeated from the detected hydrogen pipe, the hydrogen permeation collecting device is provided with a hydrogen concentration sensor, and the hydrogen permeation characteristic of the detected hydrogen pipe can be calculated according to the hydrogen concentration detected by the hydrogen concentration sensor. The test pipeline is communicated with the hydrogen pipe to be tested to form a test loop, and the actual application working condition of the hydrogen pipe to be tested can be simulated in the test loop through the hydrogen supply module, the air exhaust module, the humidifying module, the temperature adjusting module and the circulating power element. The hydrogen permeation amount of the tested hydrogen pipe is tested under the hydrogen condition with the same pressure, temperature and humidity as the actual application working condition of the fuel cell system, so that the hydrogen permeation characteristics of rubber pipes made of different materials are judged.

The invention relates to the technical field of gas permeability testing, in particular to a method and a device for testing hydrogen permeability of a high-pressure flexible composite pipe under tensile load. The device comprises a hydrogen concentration detection sensor, a nut, a thrust bearing, a pull rod, a stress monitoring sensor, a blind flange, a flange, an organic glass tube and a clamping plate, wherein the blind flange can seal gas in the tube; the clamping plate is used for axially positioning the composite pipe; axial prestress can be applied to the composite pipe by screwing the nut, and the stress monitoring sensor can record a stress value; the hydrogen concentration detection sensor can detect the gas concentration in the organic glass tube. Compared with the existing closest technology, the method has the advantages that the influence of the tensile load on the hydrogen permeability of the full-size high-pressure flexible composite pipe is considered, the test result is closer to the actual working condition, and technical support can be provided for selection and research and development of the hydrogen energy conveying high-pressure flexible composite pipe material.

The invention belongs to the technical field of PEM water electrolysis hydrogen production, and provides a control method and system of PEM water electrolysis hydrogen production equipment. The method comprises the following steps: extracting a differential pressure oscillation signal and analyzing to obtain a differential pressure unbalance area; through associated risk modeling of the pressure difference and the permeability, outputting a risk level for predicting hydrogen permeation; executing a differential intervention strategy, extracting effective inhibition characteristics, and constructing a two-dimensional evaluation domain to judge whether hydrogen permeation is completely inhibited or not; and if the hydrogen is not completely inhibited, extracting and screening a hydrogen reverse migration path to obtain a response isolation path and a permeation duration coefficient, and triggering equipment safety isolation and inerting response control according to the permeation duration coefficient. The control system comprises an unbalance analysis module, a penetration analysis module, an inhibition judgment module, a path extraction module and a response control module. According to the invention, risk assessment and efficient safety control of the PEM water electrolysis hydrogen production equipment can be realized, and the safety and stability of equipment operation are improved.