16 results about "Nitrogen pressure" patented technology

The utility model belongs to hydrogen fuel cell technical field especially relates to a hydrogen pressure reducing device with explosion -proof function. The utility model provides a hydrogen pressure reducing device with explosion -proof function, include: hydrogen delivery pipe, nitrogen delivery pipe, hydrogen pressure reducing valve, nitrogen pressure reducing valve, safety valve, nitrogen purging pipe, emptying pipe and multiple ball valves, pressure gauge and safety pipeline, through hydrogen pressure reducing valve and safety valve overpressure automatic pressure relief function, ensure that system pressure is stable, nitrogen purging pipe and emptying pipe constitute purging system, can remove residual hydrogen in pipeline, avoid the risk of explosion, each ball valve realizes gas source quick opening and closing control, and pressure gauge real -time monitoring pressure state, the device is equipped with check valve to prevent gas backflow, and filter guarantees that gas is pure. The utility model passes through multiple safety design, and the explosion -proof performance and operating safety are improved obviously.

The application discloses a kind of low-aluminum low-sulfur high-chromium high-nitrogen series pressure vessel steel and smelting method, belong to steelmaking technical field, its chemical component and weight percentage are as follows: C:0.06-0.15%, Si:0.2-0.5%, Mn:0.3-0.6%, P≤0.025%, S≤0.003%, Alt 0.005-0.015%, Cr:8.0-13.5%, Mo:0.8-1.2%, V:0.15-0.3%, Nb:0.05-0.1%, N:0.03-0.08%, the balance is Fe and other inevitable impurities.Smelting method is converter smelting, LF refining, RH vacuum treatment and conventional continuous casting.The application does not need to increase equipment, ensures deep desulfurization under low Alt condition, optimizes LF refining parameter, smelts high N high Cr steel using LF furnace, stably controls each component, so that the composition of molten steel meets the requirements.

This invention belongs to the field of blast furnace gas heating furnace operation control technology, specifically disclosing a 2500m 3 The HyCROF gas-fired furnace blast furnace changeover fluctuation solution utilizes high-purity nitrogen instead of traditional decarbonized gas as the pressure equalization medium. It reconstructs a three-stage changeover process: nitrogen purging and inerting, nitrogen pressure equalization, and undisturbed gas switching. Combined with PLC system linkage control and key parameter solidification, this achieves undisturbed operation during the changeover process. This invention fundamentally solves the problems caused by traditional changeover methods, such as drastic fluctuations in gas flow and pressure, disordered gas flow distribution, excessive blast furnace pressure differential, unstable furnace temperature and molten iron quality, and safety hazards. It reduces gas flow fluctuations to ≤5%, blast furnace pressure differential fluctuations to ≤0.003MPa, and increases the smooth operation rate to 99.5%, while simultaneously reducing the fuel ratio, improving gas utilization, and eliminating safety risks.

The utility model relates to the vacuum test field, and specifically is a kind of vacuum leak detection test system for aircraft wastewater system, including air pipe, input pipe, nitrogen pressure reducer, pressure regulating filter, vacuum generator, pressure measuring tube and test tube, and the both ends of air pipe are connected with first quick coupling and second quick coupling respectively, and the both ends of input pipe are connected with second quick coupling and third quick coupling respectively, and third quick coupling is also connected with nitrogen pressure reducer, and the both ends of pressure regulating filter are connected with second quick coupling and vacuum generator respectively, and vacuum generator is connected with silencer and the pipeline of aircraft wastewater system respectively, and the both ends of test tube are connected with adapter and fourth quick coupling respectively, and the both ends of pressure measuring tube are connected with air pipe pipeline and vacuum gauge, and air inlet stop valve, exhaust stop valve and pressure regulating valve are installed on test panel.The product can select gas source according to working condition, reduce use cost, and the size of vacuum degree is accurately regulated by pressure regulating valve, and precise regulation value can be obtained.

The utility model discloses a flow guide type nitrogen heater, including heater box body, the inside installation of heater box body has the flow guide pipe, the flow guide pipe is commonly made of multiple U type structure pipeline, nitrogen pressure regulating mechanism is installed with booster pipeline and pressure relief pipeline respectively, one end of booster pipeline is linked together with the flow guide pipe inside through nitrogen booster mouth, one end of pressure relief pipeline is linked together with the flow guide pipe inside through nitrogen pressure release mouth. The utility model discloses a flow guide pipe that is commonly made of multiple U type structure pipeline and is installed in the inside of heater box body, can be used for guiding nitrogen gas flow direction, prolongs the retention time of gas in the inner chamber, thereby makes gas heat fully, makes gas heating even, improves heat exchange efficiency, is provided with booster pipeline and pressure relief pipeline simultaneously, can be used for the real -time regulation control of flow guide pipe inside gas pressure, guarantees its internal air pressure safety and stability, prevents the security hidden danger problem of flow guide pipe inside.

The utility model discloses an oxygen compressor starting nitrogen gas running stage's air inlet device, the device according to oxygen pressure machine air inlet pressure, flow design value, design air separation device liquid nitrogen gasification equipment output's normal temperature nitrogen gas as oxygen pressure machine starting nitrogen gas running stage's nitrogen gas source, utilize liquid nitrogen pump frequency changer, nitrogen gas pneumatic conveying valve's adjusting function, change liquid nitrogen pump speed, adjust pneumatic nitrogen gas conveying valve opening degree, will liquid nitrogen gasifier export normal temperature nitrogen gas pressure, flow value adjust to oxygen pressure machine air inlet pressure, flow design value, convey to oxygen pressure machine air inlet pipeline, the utility model solves oxygen pressure machine starting nitrogen gas running stage because of using low pressure nitrogen gas, medium pressure nitrogen gas's air inlet technology and produces nitrogen gas air inlet pressure value and oxygen pressure machine air inlet pressure design value do not tally, lead to oxygen pressure machine operating condition deviates problem, has improved oxygen pressure machine starting nitrogen gas running stage's safety stability significantly.

This utility model relates to the field of shaft seals, particularly shaft seal devices and systems, including mechanical seals. A sealing cavity is provided on the outer side of the mechanical seal, and a material channel is provided on the inner side. The sealing cavity includes an annular channel and an inlet channel and an outlet channel connecting the ends of the annular channel. The sealing fluid contained in the sealing cavity is a trichlorosilane or silicon tetrachloride liquid with the same properties as the process material. An integrated sealing system is formed by the shaft seal device, a pressure stabilizing tank, and two staggered supply and return pipelines. Using a trichlorosilane or silicon tetrachloride liquid with the same properties as the process medium as the sealing fluid, a constant pressure difference is formed between the tank and the sealing cavity through natural circulation, allowing the sealing fluid to continuously lubricate, cool, and isolate the double-end mechanical seal. A level gauge provides real-time feedback on the leakage rate, and a nitrogen pressure regulating valve automatically compensates for the pressure, achieving "internal leakage without external leakage." This allows for online wear monitoring, significantly extends the mechanical seal's lifespan, and reduces the frequency of downtime for the filter cake dryer.

This utility model discloses a continuous casing chemical dosing device, relating to the field of oilfield development technology. It includes a nitrogen cylinder, with a needle valve fixedly connected to the output end of the nitrogen cylinder. A pressure gauge is installed on one side of the needle valve, and a shut-off valve is installed on the other side of the pressure gauge. A chemical tube is installed on one side of the nitrogen cylinder, with an injection valve installed at one end. A regulating valve and a flow meter are sequentially installed on the side of the injection valve, and a check valve is installed on the side of the flow meter. A gate valve is fixedly connected to the check valve. During use, the chemical is stored in the chemical tank by a pump. The nitrogen pressure in the nitrogen cylinder drives the chemical in the tank. The nitrogen pressure in the nitrogen cylinder is always greater than the annular pressure of the casing, and the chemical pressure is also greater than the annular pressure. The chemical can be continuously added to the casing annulus at a set rate to achieve corrosion and scale prevention. This device is simple, requires no power equipment, has a low failure rate, and is inexpensive.

The application relates to the technical field of pipeline fittings, and provides an automatic furnace pressure stabilizing device for an oxidation-free heat treatment furnace, which comprises a supporting seat arranged outside a nitrogen discharge pipe of the heat treatment furnace, a cover plate is installed on the supporting seat through a pin shaft, and the cover plate covers the nitrogen discharge pipe. The application has the characteristics of simple structure, high reliability and the like. When the nitrogen pressure inside a hearth of the heat treatment furnace is greater than the gravity borne by the cover plate, the cover plate is lifted, nitrogen is discharged through the nitrogen discharge pipe, and along with the continuous discharge of the nitrogen, when the nitrogen pressure inside the hearth of the heat treatment furnace is less than the gravity borne by the cover plate, the cover plate covers the nitrogen discharge pipe of the heat treatment furnace, so that the fluctuation of the actual furnace pressure can be effectively stabilized. When the nitrogen pressure inside the hearth of the heat treatment furnace cannot meet the preset discharge condition, the cover plate cannot be lifted, so that the hearth of the heat treatment furnace can be in a cut-off state to a certain extent, and because the nitrogen discharge is threshold discharge, the nitrogen consumption and fuel consumption can be effectively reduced.

A tester apparatus is described of the kind having contact with terminals on a wafer for purposes of testing the wafer. A dielectric gas is used to reduce arcing between the contact. A stationary structure and a portable structure have complimentary gas interfaces that engage when the portable structure engages with the stationary structure. A gas box has a channeling block connected to a dielectric gas pressure regulator and a nitrogen gas pressure regulator and connected to a gas supply passage to selectably provide nitrogen or dielectric gas to the gas supply passage. A tray has a portion that is electrically conductive to make contact with a rear wafer terminal, vacuum passages, and each vacuum passage has an enlarged section to reduce.

The utility model relates to propylene compressor technical field, concretely relates to a propylene compressor dry gas seal gas switching system, through the stable high pressure nitrogen gas of sealing nitrogen import in starting and stopping machine stage provides as the first stage seal gas, avoided the demand of buying professional equipment production first stage seal gas, sealing nitrogen regulating valve and differential pressure transmitter interlock, accurate control nitrogen pressure, ensure the sealing effect while reducing nitrogen consumption, heater and temperature sensor interlock, keep the main seal gas that enters dry gas seal has 20 DEG C superheat, improve seal reliability, the combination design of first bypass switch valve, second bypass switch valve and first connection switch valve, third connection switch valve, outlet check valve, realized after starting completion automatic switching to compressor outlet process gas as first stage seal gas, further reduced the operation cost, the whole system passes through the automatic switching mechanism, effectively solved the technical problem of high cost of user.

The invention relates to the field of fuel rods, in particular to a preparation and verification method of a standard rod for helium pressure nondestructive testing. The method comprises the steps that under the same standard temperature environment temperature, in the welding process, nitrogen is filled, meanwhile, nitrogen pressure is corrected, and standard rods of three specifications are prepared and formed; the appearance is checked; calibrating the standard rod in a stable environment; and the verification confidence coefficient is 0.95. According to the preparation method, calibration is carried out synchronously, and the calibrated standard rod can be matched with helium pressure nondestructive testing equipment, so that subsequent helium pressure nondestructive testing is facilitated.