17 results about "Hydrogen valve" patented technology

The invention discloses a hydrogen production system safety linkage control method based on multistage hydrogen concentration threshold values. The method comprises the steps that S1, hydrogen concentration detection values of all areas of a hydrogen production system are collected in real time; s2, threshold value judgment: comparing a detection value with a plurality of preset concentration threshold values; s3, executing a corresponding linkage control action according to a comparison result: when a detection value reaches or exceeds a first-level threshold value, triggering a first-level response, and executing alarm starting and accident exhaust; when the detection value reaches or exceeds a second-level threshold value, triggering a second-level response, executing the action of the first-level response, and additionally cutting off a hydrogen valve in an associated area; when the detection value reaches or exceeds a third-level threshold value, third-level response is triggered, the action of second-level response is executed, and emergency shutdown of the starting system is increased; according to the method, early warning, hierarchical control and emergency protection of the hydrogen leakage risk are achieved, and unnecessary interference on production is reduced on the premise that safety is guaranteed.

The application provides a hydrogen valve flow control method and system, relates to the technical field of high-pressure hydrogen valves, and comprises the following steps: acquiring operation parameters of a valve in real time, including valve core displacement, inlet pressure, outlet pressure and real-time flow passing through the valve; at least one key characteristic parameter of a flow field in the valve under a current state is calculated based on the operation parameters, whether the current position of the valve core is in a key adjustment area is judged; if yes, an optimized motion trajectory instruction for the valve core is dynamically generated based on a model predictive control algorithm, with the goal of minimizing system pressure oscillation and valve core impact; the optimized motion trajectory instruction is executed, the valve core is controlled to move according to the corresponding optimized motion trajectory, and the working state of a flow guide component is adjusted coordinately. The application can generate an optimized valve core motion trajectory before severe pressure oscillation occurs, greatly reduce the dynamic load on the pressure impact and the valve core, and improve the service life and safety of the valve and the pipeline system.

The invention discloses a method for removing a coating on the inner wall of MPCVD equipment, which specifically comprises the following steps: mixing an alcoholic solution and an aqueous solution, and putting the mixture into a bubbling device; closing a door of the cavity of the MPCVD equipment, and vacuumizing the cavity; opening a hydrogen valve on the bubbling device, enabling hydrogen to enter the bubbling device, enabling the hydrogen to carry the volatilized alcohol-water mixed solution to enter a reaction chamber of the MPCVD equipment, placing a molybdenum sheet on a sample table, starting microwaves, and activating plasmas; the temperature of the molybdenum sheet, the microwave power and the pressure are increased; the microwave and hydrogen valves are closed; the temperature of the molybdenum sheet is reduced; the cavity door of the equipment is opened; according to the method, hydrogen is utilized for bubbling, the aqueous solution with certain volatility is brought into the reaction cavity, the bonding strength of the coating and the inner wall of the equipment is remarkably reduced under the high-temperature condition, and the coating on the inner wall of the equipment can be efficiently removed after simple purging of an air gun.

The invention provides a Ni-W-P-graphene gradient chemical plating layer for a 70 MPa hydrogen storage valve body and a preparation method of the Ni-W-P-graphene gradient chemical plating layer, the total thickness of the plating layer is 15-25 microns, and the plating layer adopts a continuous gradient structure of an inner layer high-P region, an outer layer low-P high-W region and a gradient transition region; the outer layer contains 3-7 wt% of P, 6-12 wt% of W and 0.2-1.0 wt% of graphene; and the transition area realizes continuous gradual change of components to eliminate interface stress. A single-groove gradient injection process is adopted for preparation, the inner layer is deposited for 0-60 min, low-P high-W mother liquor and graphene dispersion liquid are injected for 60-75 min, the outer layer is deposited for 75-90 min, and 160-240 DEG C vacuum heat treatment is matched. The hydrogen permeation current density of the plating layer in a 70 MPa pure hydrogen environment is reduced by more than or equal to 90% compared with that of a bare material, the plating layer is free of white rust after salt mist for 1000 h and free of peeling after 1000 times of thermal circulation, the plating layer and the surface of the valve body can construct a gradient protection structure with low hydrogen permeation, high hardness, corrosion resistance and wear resistance, and the long-term service reliability is improved. And the preparation process is compatible with an existing chemical plating line, additional equipment is not needed, and the method is suitable for batch production of high-pressure hydrogen valves.

The invention discloses a shut-down method of a diesel oil liquid phase hydrogenation device, which comprises the following steps: (1) firstly reducing the feeding temperature of a diesel oil raw material, introducing supplementary hydrogen into the diesel oil liquid phase hydrogenation device by a new hydrogen compressor at the same time, stopping feeding the diesel oil raw material after the reaction temperature is reduced, introducing light distillate oil to wash each catalyst bed layer in a reactor, and stopping feeding the light distillate oil after the reaction temperature is reduced; after the washing is finished, stopping injecting the light distillate oil; (2) closing a supplemental hydrogen valve, enabling supplemental hydrogen to pass through the heating furnace and the gas-liquid mixer, enabling the heated supplemental hydrogen to enter from the top of the reactor to perform first purging, then introducing part of fuel gas of the heating furnace into a catalyst bed layer at the lower part of the reactor to perform second purging, stored oil of the lower bed flows out from the bottom of the reactor under the combined action of supplementary hydrogen and fuel gas. According to the method, the oil carrying effect of the catalyst during shutdown is effectively improved, the purging time is shortened, and the shutdown process of the liquid-phase hydrogenation device can be rapidly completed.

The application discloses a hydrogen pipeline venting system deflagration and tempering test system and method, relates to the technical field of pipeline testing, and comprises a premixing and concentration adjusting system, an adjustable release system, an along-path temperature and pressure detection system and a visual tempering detection system. The premixing and concentration adjusting system is arranged to simulate the hydrogen-air premixing state in the venting pipeline caused by hydrogen valve internal leakage. The adjustable release system is arranged to simulate the hydrogen spontaneous combustion state under different release rates. The adjustable release system is arranged to test the influence of different pipe diameter specifications and pipe fitting setting modes on the pressure rise in the deflagration process. The along-path temperature and pressure detection system is arranged to test the spontaneous combustion condition in the venting pipeline and also to test the influence of different pipe diameters and pipe fitting structures of the venting pipeline on the deflagration overpressure. The visual tempering detection system is established to test the tempering scale after ignition and combustion, so as to provide a relief strategy.

The invention provides a hydrogen valve flow control method and system, and relates to the technical field of high-pressure hydrogen valves, and the method comprises the following steps: obtaining operation parameters of a valve in real time, including valve core displacement, inlet pressure, outlet pressure and real-time flow passing through the valve; calculating at least one key characterization parameter of a flow field in the valve in the current state based on the operation parameters, and judging whether the current position of the valve element is in a key adjusting area or not; if yes, an optimized movement track instruction for the valve element is dynamically generated based on a model predictive control algorithm by taking minimization of system pressure oscillation and valve element impact as targets; and executing the optimized motion trail instruction, controlling the valve element to move according to the corresponding optimized motion trail, and cooperatively adjusting the working state of the flow guide component. According to the application, an optimized valve core movement track can be generated before violent pressure oscillation occurs, so that the pressure impact and the dynamic load on the valve core are greatly reduced, the service life of the valve and a pipeline system is prolonged, and the safety of the valve and the pipeline system is improved.

The utility model relates to the technical field of dilute nitric acid production, in particular to a fast hydrogen igniter device of a dilute nitric acid oxidation furnace, which comprises an explosion-proof junction box, a special ignition cable and an igniter, the bottom of the explosion-proof junction box is fixedly connected with the special ignition cable, and the other end of the special ignition cable is fixedly connected with the igniter. A power line is fixedly connected to one side of the bottom of the igniter; one side of the explosion-proof junction box is fixedly connected with a pipeline, one end of the pipeline is fixedly connected with flange plates, and the flange plates are connected through screws. An ignition rod and a hydrogen pipeline which are distributed up and down are arranged in the pipeline, and a hydrogen valve is mounted on the outer side of the hydrogen pipeline; according to the utility model, the igniter is started, the ignition rod is used for ignition, the hydrogen valve is opened, the hydrogen is discharged, and ignition can be carried out in time, so that the hydrogen ignition speed is higher, the oxidation furnace can be ignited more quickly, the gas emptying time is short, and the environmental pollution is smaller.

The present application belongs to the hydrogen / hydrogen valve processing technology field, and specifically relates to a hydrogen / hydrogen valve butt joint end processing technology, comprising the following steps: step a, selecting a valve body material, and forming a valve body blank by integral die forging processing; step b, finishing the surface of the valve body blank to form a valve body; step c, processing the butt joint end of the valve body according to the prefabricated size; and step d, extruding the butt joint end of the valve body by an extrusion die. The integral die forging valve butt joint end extrusion variable diameter forming process adopted by the present application is a brand new valve manufacturing technology, and the integral valve extrusion variable diameter forming manufacturing process is adopted to overcome the traditional hydrogen / hydrogen valve butt joint welding joint process, to solve the problems of valve sealing leakage, hydrogen corrosion cracking of the welding seam and the like, and to improve the valve quality and avoid the hazards caused by hydrogen leakage.

The invention relates to the technical field of hydrogen storage, in particular to a hydrogen valve with an anti-leakage function, which comprises a valve body, a valve core and a valve rod, the valve core is fixed at one end of the valve rod and positioned in the valve body, the other end of the valve rod extends out of the valve body and is in threaded fit with the valve body, and the hydrogen valve further comprises a sealing shell, a hydrogen sensor and an operating device; the sealing shell is arranged on the valve body, a sealing operation cavity is formed in the sealing shell, and the end, away from the valve element, of the valve rod extends into the sealing operation cavity. The hydrogen sensor is arranged in the sealed operation cavity and used for detecting hydrogen leaking into the sealed operation cavity from the valve body along the valve rod. The operating device extends into the sealing operation cavity and is used for operating the valve rod to rotate. By means of the sealed operation cavity arranged in a sealed mode, a small amount of leaked hydrogen can be sealed in a concentrated mode, the hydrogen is prevented from directly entering air, after the hydrogen is concentrated, a hydrogen sensor can conveniently and accurately detect hydrogen leakage, and therefore more time is won for users to deal with the hydrogen leakage problem.

The application discloses a physical heat storage type solid-state hydrogen storage device, which comprises a hydrogen storage cavity and a circulating cavity, a high-thermal-conductivity sealing shell and a heating structure are arranged in the hydrogen storage cavity, a hydrogen storage alloy is arranged in the high-thermal-conductivity sealing shell, a hydrogen pipeline is connected to the front end of the hydrogen storage alloy, and a hydrogen valve is arranged on the hydrogen pipeline. In the hydrogen filling stage, the hydrogen storage alloy is forced to conduct convection cooling by using external air, and the hydrogen storage capacity of the hydrogen storage alloy is greatly improved. In the hydrogen releasing stage, the hydrogen storage alloy is heated by using a phase change heat storage module with constant temperature heat release characteristics, so that the hydrogen is smoothly released, the safety hidden danger of the electric heating mode is eliminated, and the safety and the storage ratio parameters of the solid-state hydrogen storage device are greatly improved. The radiation-proof plate with the gas switch function and the circulating pump are arranged, a large range of heating power can be adjusted, the hydrogen releasing rate can be accurately controlled, the operation is simple and fast, and the applicability of the solid-state hydrogen storage device is improved.

A work machine (100) has a fuel cell stack (22), a hydrogen tank (21), a hydrogen valve (24), a body (11), and a controller (30). The fuel cell stack (22) generates electricity by causing oxygen and hydrogen to react. The hydrogen tank (21) supplies hydrogen to the fuel cell stack (22). The hydrogen valve (24) opens and closes a hydrogen flow path from the hydrogen tank (21) to the fuel cell stack (22). The body (11) supports each of the fuel cell stack (22) and the hydrogen tank (21). The controller (30) controls the opening and closing of the hydrogen valve (24) on the basis of the inclination angle of the body (11).

Disclosed herein is an apparatus for testing liquefied hydrogen valve that can configure the test valve to environmental conditions of a temperature below 20K by using only low-cost helium gas without using liquefied hydrogen or liquid helium as the test fluid. This helps companies developing liquefied hydrogen valves to safely and conveniently perform valve leakage and performance tests. In accordance with the present invention, the apparatus for testing liquefied hydrogen valve includes a test vessel in which a valve body of a test valve is inserted into a vacuum-exhausted inside and sealed with a vessel cover so that an operating part of the test valve protrudes to an outside; an inlet pipe, one end of which is connected to an inlet port of the valve body; an outlet pipe, one end of which is connected to an outlet port of the valve body; a helium tank connected to the other end of the inlet pipe to supply helium gas to the inlet port of the valve body; a cryogenic refrigerator in which a cold head part that cools to a temperature below 20K is inserted into the test vessel, and a gas compression part that suctions, compresses and discharges a refrigerant gas is sealed so that it protrudes out of the vessel cover; a heat conductor, one end of which is coupled to the cold head part of the cryogenic refrigerator and the other end of which is coupled to the valve body of the test valve, and which cools the valve body of the test valve to a temperature below 20K; and a pressure sensor and a flow sensor installed on the inlet pipe and the outlet pipe to measure pressure and flow rate, respectively.

This invention relates to the field of energy-saving combustion technology for furnaces and kilns in the metallurgical industry, specifically to a combined hydrogen-mixed low-carbon combustion device and its control method. The invention mainly includes a hydrogen valve assembly, a gas valve assembly, an air valve assembly, a burner, an igniter, and a baffle plate. The hydrogen valve assembly includes a hydrogen regulating valve and a hydrogen flow meter; the gas valve assembly includes a gas regulating valve, a gas flow meter, and an online gas composition analyzer, wherein the online gas composition analyzer is installed on the gas pipeline; the air valve assembly includes an air regulating valve and an air flow meter. This invention achieves hydrogen-mixed combustion by mixing hydrogen into the existing heating furnace combustion device during fuel combustion. Through the coordination between the various valve assemblies, the flow control valve controls the intake air volume, and the temperature monitoring device monitors the intake air temperature, achieving the effects of reducing pollutant emissions and increasing energy utilization.

The presently disclosed invention relates to a hydrogen valve having a valve housing with a fluid inlet and a fluid outlet. The hydrogen valve includes a valve main body which is configured to be transferable between an open position, in which a volumetric flow connection is established between the fluid inlet and the fluid outlet, and a closed position, in which the valve main body is arranged in a main sealing seat fixed to the housing and the volumetric flow connection between the fluid inlet and the fluid outlet is closed. Also included is a pilot control valve device having a pilot member which is transferable by way of an actuator between an open position in which a throttle bore is exposed through the valve main body and connects the fluid inlet and the fluid outlet to each other and a closed position, in which the pilot member rests in a pilot control valve seat arranged on the valve main body and closes the throttle bore.

The utility model relates to hydrogen valve technical field discloses a variable cross section hydrogen valve, including valve body, the valve body inside is equipped with valve seat, the valve body top is fixedly installed with the valve cover through bolt, the valve cover inside is fixedly installed with sealing element through bolt, the valve cover top is equipped with the adjusting mechanism, the valve cover top fixedly connected with the mount, the mount inside screw thread connection has the threaded column, the threaded column top fixedly bushed with the runner, the utility model discloses when needing to change the flow cross section, through the setting of runner, threaded column, mount, lifting piece and adjusting cylinder, when adjusting cylinder ascends, the gas outlet groove width of the valve seat notch is from narrow to wide transition, and the flow cross section continuously increases, when descending, the exposed gas outlet groove width is from wide to narrow transition, and the flow cross section continuously reduces, thereby realizing the purpose that the flow cross section changes, and the operation mode is simple and easy to understand, can realize the continuous, accurate regulation of the flow cross section, satisfies different hydrogen flow demand.

This invention discloses a system and method for photovoltaic hydrogen production for boiler catalytic denitrification and green hydrogen co-firing. The system includes: a distributed photovoltaic power generation system, a power grid, a power distribution unit, a water electrolysis hydrogen production and control unit, a hydrogen valve (first type), a boiler, a hydrogen valve (second type), an oxygen valve, a blower, and a main fuel module. The power distribution unit transmits electricity from the photovoltaic system and the power grid to the water electrolysis hydrogen production and control unit. The hydrogen and oxygen generated by this unit do not require storage containers and are immediately fed into the boiler for use. Specifically, hydrogen is preferentially fed into the boiler denitrification device as a reducing agent, replacing traditional ammonia injection and completely solving the ammonia escape problem; excess hydrogen is then co-fired in the combustion system. Oxygen is fed into the boiler as a combustion aid via a blower. This invention eliminates the complex green ammonia synthesis and storage process, achieving on-demand production and use of green hydrogen, effectively improving photovoltaic absorption capacity, and significantly reducing system investment and operating costs.