10results about How to "Avoid hydrogen embrittlement" patented technology

The ultrahigh-pressure axial-flow type gas pressure regulator comprises a left valve body, a middle valve body, a right valve body and a pressure regulating assembly, the left valve body is provided with a gas inlet channel, a valve clack and a guide sleeve are fixed to the right end of the left valve body in a sealed mode, the valve clack is provided with a vent hole, a pressure regulating gas channel is formed between the guide sleeve and the valve clack, and the middle valve body is connected with the left valve body and the right valve body in a sealed mode in a left-right corresponding mode. The pressure adjusting assembly comprises a piston and a valve cylinder, the piston is in sliding sealing fit with the middle valve body, the valve cylinder is fixed to the middle of the piston in a sealing mode, the left half portion of the valve cylinder is in sliding sealing fit with the guide sleeve, the right half portion of the valve cylinder is in sliding sealing fit with the right valve body, and the space between the piston and the left valve body is an inflation cavity. A space between the piston and the right valve body is a feedback cavity which is communicated with the air outlet channel; the left valve body, the middle valve body, the right valve body, the valve clack, the guide sleeve, the piston and the valve cylinder are all made of austenitic stainless steel. The device has the advantages of simple structure, safety, reliability and high practicability.

The present invention belongs to the technical field of gas diffusion materials, and specifically relates to a high-conductivity, high-strength, gradient-structured gas diffusion material and its preparation method and application. The present invention firstly makes metal fibers of a specific size into metal fiber felt, and then presses hydrogenation and dehydrogenation metal powders of a specific particle size into a porous green metal plate, and then presses the two together, and then adopts a composite sintering method to make the interface of the two solid-dissolve to form a composite material, which not only ensures the strength of the material, but also improves the porosity of the material. In the cooling process after sintering, the composite material is nitrided, and the specific process of the nitriding treatment is controlled to form a metal nitride layer on the surface of the composite material, which can improve its conductivity in a strong acid or strong base environment and avoid the formation of an oxide film.

The invention belongs to the technical field of electric heaters, and particularly relates to a preparation method of a long-life high-temperature magnesium oxide powder heating pipe. The method comprises the steps that an electrothermal alloy wire is pre-oxidized for 1-3 h in an oxygen-containing atmosphere at 900-1100 DEG C, a compact oxidation film is generated on the surface of the electrothermal alloy wire, and a pre-oxidized electrothermal alloy wire is obtained; the pre-oxidized electrothermal alloy wire is arranged in the axial direction of a metal protective sleeve, the metal protective sleeve is filled with fused magnesia powder with the purity larger than or equal to 96 wt%, then diameter shrinkage is conducted on the metal protective sleeve, and the fused magnesia powder is compacted and wraps the pre-oxidized electrothermal alloy wire; carrying out curing heat treatment on the reduced metal sheath tube; annealing is carried out on the processed metal protective sleeve; and cleaning the two ends of the annealed metal sheath pipe to obtain the high-temperature magnesium oxide powder heating pipe.

This invention relates to the technical field, specifically a method for laying a flexible, intelligent hydrogen transmission pipeline that enables rapid installation. The pipeline includes a polyethylene pipe, the outer side of which is covered with a second adhesive layer. The polyethylene pipe and the second adhesive layer are bonded together by a fiberglass tape reinforcing layer. The outer side of the second adhesive layer is covered with a first adhesive layer, and the second adhesive layer and the first adhesive layer are bonded together by an aluminum foil layer. The first adhesive layer is then covered with a polyethylene pipe protective sleeve. This invention avoids secondary excavation of the pipeline, does not damage existing roads and facilities, does not harm urban green spaces, avoids road congestion caused by construction, utilizes existing or abandoned pipelines, allows for rapid installation, requires fewer personnel, is unaffected by weather, and shortens the construction period.

The present disclosure relates to a hydro-gasification method, which comprises: (1) using inert gas with a certain pressure to transport coal powder raw material to a gasification reaction device; (2) in the gasification reaction device, the coal powder raw material is subjected to a hydro-gasification reaction with hydrogen. In the hydro-gasification method provided by the present disclosure, the inert gas is used to replace high-pressure hydrogen to transport the coal powder, which can avoid the problem of "hydrogen brittleness" of the conveying pipeline, and can also avoid the problems of spontaneous combustion of the coal powder, explosion caused by static spark and the like; the coal powder raw material is replaced by methanol coal powder as the raw material, which can reduce the demand for hydrogen in the hydro-gasification process; the raw material is transported in a solid state, which can expand the conveying capacity range, reduce the number of reactor nozzles, and reduce the design difficulty of the hydro-gasification reaction device.

The application relates to the field of diaphragm compressors, and discloses a metal diaphragm, a preparation method and application thereof. At least one surface layer of the metal diaphragm is a modified layer with a nanostructured structure and vacancy clusters. The preparation method of the metal diaphragm comprises the following steps: (1) using a projectile to spray the surface of a metal base material diaphragm, so that the obtained metal base material diaphragm has a surface nanostructured layer; and (2) using an ion beam to bombard the surface nanostructured layer of the metal base material diaphragm, so that the metal diaphragm is obtained. The metal diaphragm provided by the application has high hardness and tensile strength and excellent wear resistance, and can limit hydrogen on the surface of the diaphragm and prevent the hydrogen from diffusing into the diaphragm, thereby preventing the occurrence of hydrogen embrittlement.

This utility model discloses a dust removal and cooling device for high-dust, high-concentration, ultra-high-temperature hydrogen gas, used for dust removal and cooling of the cracked gas produced by methane cracking for hydrogen production. It includes a dust collector and a cooling device. The dust collector comprises a gravity dust collection box and a water tank, with the gravity dust collection box nested within the water tank. The gravity dust collection box is used to deposit carbon powder in the cracked gas and has an ash hopper at its bottom. The water tank cools the gas entering the gravity dust collection box by supplying circulating water. The cooling device cools the cracked gas after dust removal by supplying circulating water. This dust removal and cooling device effectively solves the technical problems existing in the current methane cracking for hydrogen production process, such as difficulty in carbon-hydrogen separation under high dust, high concentration, and ultra-high temperature conditions, carbon powder blockage during hydrogen cooling, and difficulty in collecting carbon powder after high-temperature dust removal. The cracked gas undergoes subsequent cooling treatment only after a large amount of carbon powder is removed and after initial cooling and deceleration, which reduces the risk of blockage in the cooler.

This invention discloses a pre-combustion chamber auxiliary stabilization system based on a sealed microcavity flare and its operation method. The pre-combustion chamber auxiliary stabilization system includes a flare stabilization microcavity, an oxygen-enriched pre-combustion chamber, a fuel-enriched pre-combustion chamber, an oxidizer storage tank, and a liquid ammonia storage tank. The flare stabilization microcavity, the oxygen-enriched pre-combustion chamber, and the fuel-enriched pre-combustion chamber are each connected to the oxidizer storage tank via an oxidizer supply channel assembly. The flare stabilization microcavity, the oxygen-enriched pre-combustion chamber, and the fuel-enriched pre-combustion chamber are each connected to the liquid ammonia storage tank via a fuel supply channel assembly. The flare stabilization microcavity is connected to the oxygen-enriched pre-combustion chamber and the fuel-enriched pre-combustion chamber via a flare stabilization channel. The oxygen-enriched pre-combustion chamber and the fuel-enriched pre-combustion chamber are each connected to the thrust chamber. This invention is applied to the field of propulsion systems, enabling propulsion systems to possess excellent combustion stability margins throughout the entire process from cold start to rated operating conditions and across a wide operating range.

The present invention discloses a renewable heat-treatment-free integrated die-cast aluminum alloy and a preparation method thereof, belonging to the technical field of aluminum alloy materials. The weight percentage of each component in the die-cast aluminum alloy is Mg: 5.0-8.0%, Si: 2.0-3.8%, Mn: 1.0-1.5%, Zn: 0.1-0.5%, Be: 0.003-0.005%, Nb: 0.02-0.08%, Ti: 0.0175-0.07%, Mo: 0.005-0.02%, Fe<0.2%, the total amount of other impurities is ≤0.5%, and the balance is Al. The die-cast aluminum alloy phase includes a matrix α-Al solid solution, Mg 2 Si and BCC phase, BCC phase is evenly distributed in the grain boundary area of ​​die-cast aluminum alloy, the high melting point BCC phase has a hydrogen adsorption capacity of >150ml / g in the temperature range of 20-700℃, and it does not melt when heated to 1980℃ and kept for 2h, the hydrogen content of aluminum liquid is ≤0.05ml / 100g Al, and the slag content is ≤0.01mm 2 / kg, the obtained heat-treatment-free integrated die-casting aluminum alloy has high resistance to hydrogen embrittlement and excellent strength and toughness.

The present invention discloses a high-strength and tough die-cast aluminum alloy material without heat treatment and a preparation method thereof, belonging to the technical field of aluminum alloy materials. The weight percentage of each component in the die-cast aluminum alloy is Si: 6.0-12%, Mg: 0.1-0.45%, Mn: 0.3-0.85%, Cr: 0.05-0.2%, Sr: 0.05-0.15%, Zr: 0.05-0.12%, Ni: 0.03-0.07%, Fe<0.2%, the total amount of other impurities is ≤0.5%, and the balance is Al. The die-cast aluminum alloy phase includes a matrix α-Al solid solution, Si and ZrNi phases; the ZrNi phase is uniformly distributed near the grain boundary of the die-cast aluminum alloy, and has a strength of 5×10 ‑4 Pa hydrogen absorption equilibrium pressure and hydrogen adsorption capacity exceeding 200ml / g, and no melting occurs when heated to 1010℃, the hydrogen content of aluminum liquid is ≤0.04ml / 100g Al, and the slag content is ≤0.008mm 2 / kg, the obtained heat-treatment-free die-casting aluminum alloy has excellent strength and toughness and high resistance to hydrogen embrittlement.