352 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 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 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.

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 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 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 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 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.

The invention discloses a non-metallic material hydrogen permeation capacity testing device, and relates to the field of material hydrogen permeation experiments.The non-metallic material hydrogen permeation capacity testing device comprises a high-pressure side fastening component, a low-pressure side fastening component, a collecting component, a first annular sealing component and a second annular sealing component, and an air inlet channel and an air inlet cavity are sequentially formed in the high-pressure side fastening component from bottom to top; the first annular sealing component is arranged on the upper portion of the high-pressure side fastening component and arranged outside the air inlet cavity in a clearance sleeving mode. An air outlet cavity and an air outlet channel are sequentially formed in the collecting part from bottom to top, the second annular sealing part is arranged on the lower portion of the collecting part, and the air outlet cavity is sleeved with the second annular sealing part in a clearance mode; after the low-pressure side fastening part and the high-pressure side fastening part are installed, the second annular sealing part and the first annular sealing part can abut against the upper side and the lower side of the to-be-detected part. The device for testing the hydrogen permeation capacity of the non-metallic material ensures the sealing performance, and is simple in structure, simple and convenient to operate and accurate in test result.

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

The invention discloses a 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 invention belongs to the technical field of hydrogen-resistant coatings, and particularly relates to a hydrogen-resistant coating as well as a preparation method and application thereof. The hydrogen-resistant coating comprises an alpha-Al-based solid solution layer on the substrate, Al2O3 micro-nano particles and SiO2 micro-nano particles which are dispersed and distributed in the alpha-Al-based solid solution layer, and an Al2O3 thin film layer covering the surface of the alpha-Al-based solid solution layer. The compact structure of the alpha-Al-based solid solution can block the permeation of hydrogen atoms, enhance the interface between phase particles and a matrix, prolong the diffusion path of the hydrogen atoms in the material, increase the diffusion barrier and serve as a trap for capturing hydrogen, and the composite coating has the dual effects of capturing and blocking hydrogen, so that the hydrogen permeability is further reduced. When the coating is slightly damaged, the damaged surface can be oxidized again to form Al2O3, and the self-repairing capacity is achieved. The composite coating is prepared by adopting a braze coating method, and has the advantages of simple preparation method, low cost, capability of realizing industrial batch production and the like.

The invention discloses a hydrogen compatibility simulation test method in a high-pressure environment based on hydrogen diffusion. The method comprises the following steps: S1, preparing a sample; s2, performing a hydrogen permeation test in a high-pressure hydrogen environment; s3, preparing a hydrogen permeation cathode hydrogen filling solution; s4, performing a hydrogen permeation test in a simulated high-pressure hydrogen environment; s5, applying and adjusting cathode hydrogen charging current under simulated high-pressure hydrogen permeation; s6, determining a dynamic hydrogen charging current; s7, performing a smooth slow tensile simulation test in a high-pressure hydrogen environment; s8, carrying out a notch slow tensile simulation test in a high-pressure hydrogen environment; s9, carrying out a fracture toughness test; and S10, performing high-pressure hydrogen embrittlement evaluation based on the results of the smooth slow tensile simulation test and the fracture toughness test. According to the method, the hydrogen embrittlement performance of the material under different hydrogen pressure environments can be obtained, and the influence of the influence factors on the high-pressure hydrogen embrittlement performance of the steel can be analyzed in combination with the process, alloy components and stress states of the steel.

The invention provides a quantitative detection method for the average pressure of hydrogen in a PEM electrolyzed water cathode catalyst layer, and relates to the technical field of hydrogen production by electrolyzed water. The quantitative detection method comprises the following steps: carrying out a hydrolysis reaction in a PEM electrolytic cell, and calculating a hydrogen permeation flux N1 and a corresponding back pressure P1 under an electrolysis working condition; in another PEM electrolytic cell with the same structure, hydrogen is introduced into the cathode side, back pressure is applied to a cathode opening, meanwhile, inert gas is introduced into the anode side, an anode product channel is continuously purged, and the hydrogen permeation flux N2 under the hydrogen introduction working condition is calculated; gradually adjusting the back pressure under the hydrogen feeding working condition, repeating the step of testing the permeation flux under the hydrogen feeding working condition to obtain the hydrogen permeation flux under different back pressures, and drawing an N2-P2 curve; and determining a corresponding hydrogen back pressure value P2 when N1 is equal to N2, and calculating according to a formula deltaP = P2-P1 to obtain the average hydrogen pressure deltaP.

The invention provides a proton exchange membrane which comprises a reinforcing layer and further comprises a dense reinforcing layer and a density reinforcing layer. The reinforcing layer is provided with a catalyst and can be manufactured through electrostatic spinning or 3D printing, due to the low porosity, the compact reinforcing layer can effectively prevent the puncture influence of the anode titanium felt, due to the distribution of the pore structure and the catalyst in the reinforcing layer, the reinforcing layer can reduce hydrogen permeation, and the hydrogen permeation resistance of the anode titanium felt is improved. And a promoting effect is generated on the transportation of protons.

The invention relates to the technical field of fuel cell monitoring and life prediction, in particular to a fuel cell life prediction method combining mechanism and data driving, which comprises the following steps: calculating reversible potential of a fuel cell through a Nernst equation, and establishing a theoretical output voltage model by combining three voltage losses of activation, concentration difference and ohm; acquiring historical data of voltage attenuation under actual operation conditions, and determining a life end voltage threshold value; training historical data by using a time sequence algorithm, identifying an aging rule function of key parameters (ohmic impedance, hydrogen permeation current density, exchange current density and limiting current density), and evaluating parameter identification precision through RMSE; and substituting the parameter aging function into the voltage model to predict future voltage, and when a predicted value is lower than a life end threshold for the first time, calculating the remaining service life. According to the method, the electrochemical mechanism and the data driving technology are fused, and the prediction accuracy is remarkably improved.

The invention provides an experimental device and method for testing the performance of a non-metal hydrogen conveying pipeline, and relates to the technical field of hydrogen conveying, in the experimental device, hydrogen enters a second non-metal hydrogen conveying testing pipeline, a third non-metal hydrogen conveying testing pipeline and a fourth non-metal hydrogen conveying testing pipeline after being cyclically pressurized and boosted through a cyclic compression unit; after the pressure is regulated and reduced by the pressure regulating and metering unit, the hydrogen is returned to the circulating and pressurizing module through the first non-metal hydrogen conveying test pipeline or the hydrogen conveying pipeline provided with the first valve to be circulated so as to drive the hydrogen conveying circulating loop, then the performance test of each non-metal hydrogen conveying test pipeline is carried out, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit; and a joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit. Therefore, hydrogen transportation circulation is realized through the experimental device constructed by the nonmetal hydrogen transportation test pipeline, and performance test, hydrogen permeation detection and joint leakage monitoring of the nonmetal hydrogen transportation pipeline are carried out in the hydrogen transportation circulation process, so that in-situ measurement simulation is realized.

The invention provides a method and a device for testing hydrogen doping of a buried steel pipe under a cathode protection condition. The method and the device solve the technical problem that an internal hydrogen permeation-external hydrogen adsorption synergistic effect mechanism faced by a buried pipeline cannot be reflected in an existing test. The method comprises the following steps: establishing a dual test environment under a cathode protection condition, forming a control group and an experimental group of a corrosion test piece to be tested, deploying the control group in a single soil environment, and deploying the experimental group in internal and external hydrogen environments; the power-on potential and the power-off potential are continuously monitored in the dual test process; quantitative comparison of key parameters of the control group and the experimental group is formed according to the double test periods; and constructing a multiple regression model according to the key parameters in combination with potential correction data to quantify the correlation between the corrosion rate and the hydrogen embrittlement sensitivity. The double-environment coupling effect in the actual operation of the pipeline is synchronously simulated, and the diffusion path difference of hydrogen atoms in metal lattices and the influence of double-environment superposition on the corrosion rate are more truly reflected.

The utility model relates to the field of electrolyzed water, and provides a catalyst coated membrane structure, a membrane electrode and a device for producing hydrogen by electrolyzing water, the catalyst coated membrane structure comprises a proton exchange membrane, a cathode catalyst layer and an anode catalyst layer, the cathode catalyst layer and the anode catalyst layer are respectively arranged on two sides of the proton exchange membrane, and the anode catalyst layer is arranged on the proton exchange membrane. And a hydrophobic hydrogen-resistant layer is arranged between the proton exchange membrane and the cathode catalyst layer. The method has the advantages that the hydrogen transmittance is reduced, so that the concentration of hydrogen in anode side oxygen is reduced, the explosion risk is reduced, and the safety coefficient during operation of the electrolytic cell is improved. In addition, expensive metal and metal oxide catalysts are not used in the scheme, so that the cost of the catalyst coating film is reduced while the hydrogen resistance effect is achieved. And when the hydrogen passing ability is reduced, normal proceeding of other mass transfer is guaranteed, the water electrolysis hydrogen production device still has high performance under the condition that the hydrogen content in the anode side oxygen is low, and the safety of an electrolytic cell during operation is improved.

Provided are: a hydrogen separation filter which has a high hydrogen permeation rate and which prevents or reduces separation between layers; and a method for producing the hydrogen separation filter. The hydrogen separation filter includes a porous substrate and a palladium layer provided on the porous substrate. The grain boundary number density observed in a cross-sectional secondary electron image of the palladium layer is 1-5 grains / [mu] m. A method for manufacturing a hydrogen separation filter includes forming a palladium layer on a porous base material by a sputtering method while keeping the temperature of the porous base material at 300-600 DEG C.