11 results about "Hydrogen flux" patented technology

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 invention discloses a compact tensile sample dynamic hydrogen charging test device and a test method. The compact tensile sample dynamic hydrogen charging test device comprises an electrochemical hydrogen charging device, a liquid carrying table, a compact tensile sample and a clamp, a CT sample penetrates through the liquid carrying table through the clamp and is fixed, and the electrochemical hydrogen charging device is connected with the liquid carrying table; and the whole CT sample and the clamp head are positioned in the columnar container and are immersed in the electrolyte of the columnar container. The problems of potential safety hazards, limited hydrogen filling content and hydrogen escape during hydrogen filling of the CT sample are solved; electrochemical hydrogen charging can be carried out while a fracture toughness test or a fatigue test is carried out, so that hydrogen overflow caused from hydrogen pre-charging to an experiment is effectively avoided, and potential safety hazards of experiment problems caused by a conventional hydrogen pre-charging experiment are also avoided; any hydrogen charging current density can be taken, after the surface area of a sample is measured, the hydrogen flux in the experiment process can be strictly controlled by adjusting the current of the direct-current power supply, the gradient hydrogen concentration is obtained by controlling the current and the hydrogen charging time, research is facilitated, and experiment parameters are accurate.

The invention discloses a method for preparing iron phosphate through hydrogen-based micro-reduction roasting reinforced iron ore acid dissolution. The method comprises the following steps that (1) iron ore is pretreated into iron ore powder with D90 smaller than 74 micrometers; (2) hydrogen is introduced into the iron ore powder within the temperature range of 700-900 DEG C for micro-reduction roasting, the hydrogen flux of each kilogram of iron ore is 10-60 L / min, the roasting time is 5-30 min, and micro-reduction iron ore powder is obtained after cooling; (3) adding the micro-reduced iron ore powder into a mixed acid solution, adding a proper amount of a hydrogen peroxide solution, stirring and leaching at a set temperature to obtain a leaching mixed solution, and carrying out solid-liquid separation on the leaching mixed solution to obtain leaching residues and a leaching solution; (4) adjusting the pH value of the leachate, heating to a preset temperature, carrying out auxiliary stirring reaction, aging and filtering to obtain crude iron phosphate; and (5) calcining the crude iron phosphate, and cooling to obtain the battery-grade iron phosphate. By means of the method, the acid dissolution efficiency of the iron ore can be effectively improved, acid consumption and energy consumption are reduced, meanwhile, green production can be achieved, and the requirement for sustainable development is met.

The application relates to the technical field of separation membrane materials, and particularly discloses a high-hydrogen-flux metal film and a preparation process thereof. The application successfully realizes the operation of grain refinement of the metal film material by selecting a suitable nickel-based high-entropy alloy NiCoFeCrMn as a metal film base material and combining processes such as step-by-step deformation, segmented annealing and tempering, and obtains a high-hydrogen-flux metal film which is excellent in performance and high in yield. The technical scheme of the application effectively solves the problems such as great difficulty in thinning the dense layer, great reduction of the yield and dense performance caused by the grain boundary regulation in the technical path of improving the hydrogen flux of the dense metal film in the prior art.

The invention discloses an anti-hydrogen flux-cored wire for a small hydrogen storage tank and a preparation method and a cladding method of the anti-hydrogen flux-cored wire, the anti-hydrogen flux-cored wire for the small hydrogen storage tank comprises a flux core and a welding skin, the flux core is composed of, by mass, 40%-60% of Ni powder, 17.0%-21.0% of Cr powder, 15%-19% of Fe powder, 4.75%-7.45% of Nb powder, 2.8%-4.3% of Mo powder, 5.0%-15.0% of CeO2 powder and 0.02%-0.10% of C powder, and the sum of the mass percentages of the components is 100%. By adjusting the flux core components and optimizing the cladding process, different hydrogen storage tank body materials and welding requirements are met, the problem that in the prior art, the hydrogen permeation resistance is poor is solved, the toughness of the flux-cored wire on a cladding layer of a hydrogen storage tank body is improved, a thinner cladding layer is coated, the surface smoothness is better, and the welding quality is improved. The overall performance and the service life of the hydrogen storage tank body are improved.

This invention discloses a hydrogen-resistant flux-cored welding wire for pipeline steel, consisting of an outer sheath and a flux core. The flux core is composed of the following raw materials by mass percentage: C: 0.10%–0.11%, Mn: 1.50%–2.00%, Si: 0.30%–0.90%, Ni: 1.90%–3.00%, Mo: 0.40%–0.80%, Cr: 0.25%–0.60%, Cu: 0.40%–0.50%, with the balance being Fe. The total content of all the above raw materials is 100%. The outer sheath is made of low-carbon steel strip. This invention also discloses a method for preparing the hydrogen-resistant flux-cored welding wire. The flux-cored welding wire obtained according to this invention exhibits a hydrogen resistance in the weld area that is no less than that of the base metal. After 15 hours of electrochemical hydrogen charging, its hydrogen embrittlement sensitivity can reach 4%–7.2%, which is 1.4–2.2 times that of the base metal, greatly improving the hydrogen resistance of the weld joint in pipeline steel.

This invention discloses a low-hydrogen flux-cored welding wire based on two-dimensional MXene surface self-assembly modification, its preparation method, and its application, belonging to the field of welding materials technology. The low-hydrogen flux-cored welding wire comprises a steel strip outer sheath and a flux core filled within it, the flux core being composed of metal alloy powder and modified composite flux core powder. Its preparation method includes: preparing a two-dimensional MXene colloidal dispersion using a chemical etching method; cationically modifying the insulating slag-forming powder; mixing the two and electrostatically self-assembling and coating them; after drying, mixing with the metal alloy powder; filling the steel strip; and rolling and drawing into shape. This invention constructs a three-dimensional continuous conductive network within the flux core through the MXene layer, improving arc stability; simultaneously, the MXene shell forms a physically water-blocking labyrinth, endowing the welding wire with ultra-low hydrogen characteristics; the active titanium released by the decomposition of MXene at high welding temperatures can refine the weld grains and improve mechanical properties. This welding wire can be widely used in automated gas-shielded welding processes for high-strength steel.

The invention belongs to the technical field of welding materials, and specifically provides an ultra-low hydrogen flux-cored welding wire, comprising an outer skin and a flux core filled in the outer skin, wherein the outer skin is a steel strip; in terms of mass percentage, the flux core comprises 40-48% TiO2, 1.5-4.5% fluoride, 3-6% SiO2, 16-24% Mn, 2-6% Si, 3-6% Mg, 0.5-3% Ti, 2-6% arc stabilizer, and the balance is iron powder. The ultra-low hydrogen flux-cored welding wire provided by the invention has excellent welding process performance and mechanical properties, good weld formation, Akv≥100J under -20°C conditions, the diffused hydrogen content of the deposited metal is reduced to an ultra-low hydrogen level (≤4ml / 100g, mercury method), and the weld has good cold crack resistance.

This invention specifically relates to a hydrogen purification system based on the synergistic application of adsorption and membrane separation, encompassing the field of hydrogen purification technology. The system includes: a feed gas pretreatment module; a pressure swing adsorption (PSA) primary purification module; a membrane separation deep purification module; a truncation gas pulse regeneration control module; and a tail gas recovery and energy allocation module. In this invention, the deep synergy between the two core units, PSA and membrane separation, achieves a dual improvement in hydrogen purification accuracy and system operational stability. The design of the radial flow adsorption tower combined with a gradient composite adsorbent bed optimizes the gas flow field distribution and mass transfer efficiency, enabling the cascaded and targeted removal of different types of impurities in the feed gas, ensuring stable and efficient operation of the primary purification stage. The optimized design of the asymmetric composite palladium-silver alloy membrane tube balances hydrogen permeation flux and long-term operational reliability, achieving deep removal of trace toxic impurities from hydrogen and stably producing ultra-high purity hydrogen suitable for high-end hydrogen applications.

The present application relates to the field of electrochemical engineering, and specifically discloses a kind of PEM electrolytic water hydrogen production system energy efficiency online monitoring method, comprising: by full working condition permeation characteristic experiment, the physical residual network soft measurement model with Fick diffusion law and Henry law hard constraint is constructed, it is converted into.onnx format and deployed to edge gateway;Secondly, real-time acquisition multi-channel working condition signal, after filtering, down-sampling and normalization processing form standardized input vector, online output transient hydrogen permeation flux;Again, according to Faraday's law, hydrogen permeation flux is equivalent to virtual current component, and the effective electrolysis current of real participation electrolysis is obtained after deduction;Subsequently, an external closed loop calibration mechanism is established, and the true value is obtained by a micro gas chromatograph, and only the model output bias is adjusted to correct drift;Finally, based on the effective electrolysis current calculation theoretical hydrogen production rate, combined with the measured value, the real Faraday efficiency is obtained by eliminating the interference of permeation;Real-time monitoring of the real energy efficiency of PEM electrolytic water hydrogen production system is realized.

The invention relates to the technical field of separation membrane materials, and particularly discloses a high-hydrogen-flux metal membrane and a preparation process thereof. According to the method, the appropriate nickel-based high-entropy alloy NiCoFeCrMn is selected as a metal film base material, the processes of step-by-step deformation, step-by-step annealing, tempering and the like are combined, the operation of grain refinement on the metal film material is successfully achieved, and the high-hydrogen-flux metal film which is excellent in performance and high in yield is obtained. By means of the technical scheme, the problems that in the technical path of hydrogen flux improvement of a dense metal film in the prior art, the thinning difficulty of a dense layer is large, and the yield and the compactness can be greatly reduced through grain boundary regulation and control are effectively solved.