6results about How to "Avoid hydrogen embrittlement" patented technology

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.