217 results about "Hydrogen transport" patented technology

The invention relates to the technical field of hydrogen transportation monitoring, in particular to a real-time monitoring and positioning method and system for hydrogen leakage of a hydrogen transportation trailer, and the method comprises the steps: automatically generating a signal collection request according to a preset real-time monitoring period, and synchronously obtaining a plurality of original sensing signals in real time through a vehicle-mounted sensor array, the method comprises the following steps: respectively preprocessing a plurality of original sensing signals to obtain a plurality of target quantized data, carrying out feature extraction on the plurality of target quantized data to obtain a feature variable set, carrying out fusion decision on the feature variable set by adopting a preset target decision model to generate a fusion decision result, and performing confidence evaluation on the fusion decision result through a probability threshold comparator, generating an early warning signal when a comprehensive score exceeds a dynamic early warning threshold, sending the early warning signal and target sensing data to a remote monitoring platform, and displaying an early warning trigger position and state of the hydrogen transport trailer on the remote monitoring platform. And the hydrogen trailer transportation safety and the emergency treatment efficiency are improved.

The invention discloses a flexible hydrogen transport PE composite pipe. The flexible hydrogen transport PE composite pipe is of a three-layer structure, raw material selection, carbon fiber pretreatment, filler pulping, coating treatment and co-extrusion forming. The method solves the problems that an existing preparation method is uneven in material mixing and poor in pipe size precision. The invention further discloses the flexible hydrogen transport PE composite pipe, the flexible hydrogen transport PE composite pipe is prepared by the preparation method of the flexible hydrogen transport PE composite pipe, and the mechanical property is also improved while the flame-retardant, antistatic and compact properties are improved.

The invention discloses a non-metal composite hydrogen conveying hose with a multi-form hydrogen blocking layer. The non-metal composite hydrogen conveying hose comprises a non-metal inner pipe, a non-metal fiber reinforcement layer and a non-metal outer protection pipe which are sequentially arranged from inside to outside in a sleeving mode. The non-metal inner pipe sequentially comprises an organic hydrogen-resistant coating, a composite fiber lining pipe and a barrier layer from inside to outside; the non-metal fiber reinforced layer sequentially comprises a fiber pre-impregnated winding layer and a reinforcing rib layer from inside to outside; the non-metal inner pipe and the non-metal fiber reinforced layer are bonded with each other by adopting thermosetting polyurethane; the non-metal fiber reinforcement layer and the non-metal outer protection pipe are connected in a non-bonding mode. The non-metal composite hose has good hydrogen leakage prevention capacity and flexibility and can be used for high-pressure hydrogen conveying.

The invention discloses a static mixing device for uniformly mixing natural gas and hydrogen and a working method, and relates to the field of mixed hydrogen conveying of natural gas pipelines, and torsion and turbulent flow units are fixed at intervals in each runner hole in the device; the torsion unit comprises a plurality of torsion elements which are sequentially and parallelly overlapped and fixed front and back, each torsion element is formed by fixedly overlapping a first torsion sheet and a second torsion sheet in a vertically symmetrical manner along the central axis of the runner hole, and the turbulent flow unit comprises a plurality of turbulent flow elements which are sequentially and fixedly spliced front and back; each turbulent flow element comprises a transverse turbulent flow part and a vertical turbulent flow part, each transverse turbulent flow part comprises an elliptical central transverse turbulent flow layer and auxiliary transverse turbulent flow layers which are symmetrically distributed along the central transverse turbulent flow layer up and down, and each vertical turbulent flow part comprises an elliptical central vertical turbulent flow layer and auxiliary vertical turbulent flow layers which are symmetrically distributed along the central vertical turbulent flow layer up and down; and the mixing effect and the gas uniformity are obviously improved.

The invention relates to the technical field of airborne fuel cells, in particular to an airborne fuel cell system and a control method. The airborne fuel cell system comprises an electric pile power generation assembly, an air pressurization assembly, a hydrogen conveying assembly and an evaporative cooling assembly. And the air supercharging assembly is communicated with a cathode inlet of the electric pile power generation assembly. And the hydrogen conveying assembly is communicated with an anode inlet of the electric pile power generation assembly. The evaporative cooling assembly comprises a cooling pump, a humidifying unit, a first gas-water separator and a water storage tank, an electrode water drainage and exhaust port of the galvanic pile power generation assembly is communicated with an inlet of the first gas-water separator, and a water outlet of the first gas-water separator is communicated with the water storage tank. An inlet of the cooling pump communicates with the water storage tank, an outlet of the cooling pump communicates with the humidification unit, and the humidification unit communicates with an outlet of the air pressurization assembly. Therefore, the problems that the thermal management scheme of the airborne fuel cell is difficult to cover the whole flight envelope and the working temperature area of the fuel cell is narrow are solved.

The invention belongs to the technical field of co-scheduling of a river water path hydrogen chain and a watershed power system thereof, and particularly relates to a medium and long-term scheduling method of a power system fused with a flexible water path hydrogen chain. Comprising the following steps: establishing THPE operation constraints considering upstream river water level influence; the influence of the seasonal water level of the river channel on HV navigation conditions is considered, and HV space-time energy transfer constraints are constructed; taking the lowest operating cost of the waterway hydrogen chain and the watershed power system thereof as an objective function, and proposing a medium-and-long-term scheduling model of the waterway hydrogen chain watershed power system; the influence of the hydrogen carrying capacity of the hydrogen transport ship on the real-time hydrogen charging and discharging rate is considered, and a precision self-adaptive piecewise linearization method is designed to improve the solving efficiency; processing the nonlinear constraint of the model by adopting a linearization method, and solving the scheduling model to obtain an optimization strategy; according to the optimization strategy, medium-and-long-term cooperative operation of the waterway hydrogen chain and the watershed power system thereof is guided. According to the method, the cooperative scheduling capability and economical efficiency of the hydrogen-electricity system can be remarkably improved.

The invention relates to a self-repairing hydrogen barrier composite coating for a hydrogen storage or transportation device as well as a preparation method and application of the self-repairing hydrogen barrier composite coating, and belongs to the technical field of hydrogen energy storage and transportation materials. The coating is of a double-layer structure and is composed of a bottom coating and a humidity response microcapsule self-repairing barrier layer. The humidity response microcapsule is composed of a capsule core containing a polyurethane prepolymer and a hybrid capsule shell formed by polyurethane and siloxane, and has good hydrogen barrier performance and environmental response characteristics. In a certain humidity environment, the microcapsule is stimulated to release the capsule core material, and in-situ self-repairing is achieved. The problem that a traditional hydrogen-resistant coating is short of repairing capacity is solved, and the hydrogen-resistant coating has a wide application prospect in the aspect of improving the safety of a hydrogen conveying and storage system.

The invention relates to a hydrogen transport flexible pipeline and a hydrogen leakage detection method, the hydrogen transport flexible pipeline comprises a lining layer, an airtight layer, a fiber reinforced layer and an outer protective layer, the lining layer, the airtight layer, the fiber reinforced layer and the outer protective layer are all cylinder structures, the lining layer is made of a non-metal thermoplastic resin material, and the outer protective layer is made of a non-metal thermoplastic resin material. The airtight layer is composed of a graphene / aluminum oxide hydrogen-resistant coating and a metal aluminum layer, the fiber-reinforced layer is made of a non-metal high-strength fiber composite material, the outer protective layer is made of a non-metal thermoplastic resin material, and the fiber-reinforced layer comprises a fiber-reinforced inner layer and a fiber-reinforced outer layer; an airtight layer is wound on the outer side of the lining layer, a fiber reinforced inner layer is wound on the outer side of the airtight layer in the forward direction, a fiber reinforced outer layer is wound on the outer side of the fiber reinforced inner layer in the reverse direction, and an outer protection layer is arranged on the outer side of the fiber reinforced outer layer; a monitoring element is arranged in the outer protection layer and used for monitoring the hydrogen concentration change or the resistance change of the outer protection layer in real time, and the hydrogen protection device can be widely applied to the technical field of new energy development.

The invention relates to the technical field of gas permeability testing, in particular to a method and device for measuring the hydrogen permeation rule of nonmetal in the thickness direction, and the device comprises a first supporting seat, a hydrogen filling tank, a sample, a hydrogen measuring hose, a hydrogen concentration detector, a second supporting seat, a hydrogen filling hole, a pressure relief hole, a detection hole, an exhaust window and a sealing O-shaped ring; hydrogen is charged through a hydrogen charging hole in one side of the hydrogen charging tank, the hydrogen permeates in the thickness direction of the sample according to the concentration gradient, and the hydrogen permeates into a detection hole and then enters a hydrogen concentration detector through a hydrogen measuring hose; the device can be used for measuring the hydrogen permeation rule of nonmetal in the thickness direction, and provides experimental support for related hydrogen permeation simulation, so that a basis is provided for research, development and selection of nonmetal materials of a hydrogen conveying system.

A wind turbine comprising a tower, a nacelle mounted rotatably on the tower via a yaw system and a hub carrying one or more wind turbine blades is disclosed. The wind turbine further comprises a generator, an AC / DC converter connected to the generator and an electrolysis system connected to a DC power output of the AC / DC converter for producing hydrogen. The electrolysis system is arranged in an up-tower part of the wind turbine, e.g. in the nacelle. The wind turbine further comprises a hydrogen transport line connected to the electrolysis system for transporting hydrogen produced by the electrolysis system away from the electrolysis system, the hydrogen transport line extending along an exterior surface of the tower from the position of the electrolysis system to a lower part of the tower.

The invention discloses a hydrogen-doped natural gas experiment method based on a fuel gas micro-grid. The method comprises the following steps: providing hydrogen and natural gas; mixing the provided hydrogen and natural gas; compressing the mixed hydrogen and natural gas in a compression area; the compressed hydrogen and the compressed natural gas are respectively conveyed to an urban hydrogen doping experiment area and a terminal user experiment area; pressurizing the hydrogen-doped natural gas in the low-pressure experimental area to the high-pressure experimental area by using a compressor in the urban hydrogen-doped experimental area; the hydrogen-doped natural gas is used by equipment in a terminal user experiment area, and hydrogen is provided by a pure hydrogen pipeline, a hydrogen cylinder group or a hydrogen long pipe trailer; natural gas is provided by a natural gas pipeline, a CNG tank car or an LNG tank car, according to the overall design method of the natural gas hydrogen doping experiment system, the quality of the natural gas hydrogen doping experiment can be systematically improved from multiple aspects of gas source supply, hydrogen doping gas mixing, hydrogen doping flow, hydrogen doping conveying, hydrogen doping pressurization and terminal users, and the natural gas hydrogen doping experiment system has the advantages of being simple in structure, safe, stable and high in functionality.

The invention discloses a steel plate for a pure hydrogen conveying pipeline and a production method of the steel plate. The steel plate comprises the following components in percentage by weight: 0.021 to 0.076 percent of C, 0.07 to 0.21 percent of Si, 0.66 to 0.93 percent of Mn, 0.12 to 0.3 percent of Cr, less than or equal to 0.24 percent of Ni, less than or equal to 0.24 percent of Cu, 0.014 to 0.052 percent of Nb, 0.014 to 0.050 percent of V, 0.009 to 0.019 percent of Ti, 0.015 to 0.045 percent of Al and the balance of iron. The production method comprises the following steps: the starting / finishing rolling temperature of rough rolling is Tnr-Min (TNbC, TNbN and TTiC), the starting / finishing rolling temperature of finish rolling is Ar3-20 DEG C-Ar3 + 10 DEG C, and the finishing rolling temperature is Ar3-(40-20) DEG C; and carrying out water cooling, putting Ar3-(80-30) DEG C into water, and discharging water from Min (TVC, TVN)-300 DEG C to Min (TVC, TVN) + 5 DEG C.

The invention relates to steel for a pure hydrogen conveying pipeline and a preparation method of the steel. The steel for the pure hydrogen conveying pipeline comprises the chemical components of C, Si, Mn, P, S, Nb, Cr, RE and Fe. Wherein the content of C is 0.030%-0.070% by mass, the content of Si is smaller than or equal to 0.20% by mass, the content of Mn is 0.85%-1.25% by mass, the content of P is smaller than or equal to 0.0150% by mass, the content of S is smaller than or equal to 0.0020% by mass, the content of RE is 0.0030%-0.0100% by mass, the content of Nb is 0.010%-0.040% by mass, and the content of Cr is smaller than or equal to 0.30% by mass. The fatigue life of the steel for the pure hydrogen conveying pipeline is prolonged, and the fatigue life of a smooth sample can be prolonged to 300,000 times in a 6.3 MPa gaseous hydrogen charging environment.

The utility model relates to a comprehensive performance test board for a hydrogen subsystem of a hydrogen fuel cell, which relates to the technical field of hydrogen fuel cells and comprises a test loop system. The test loop system comprises a pressure reducing valve, a pilot-operated type electromagnetic valve, a hydrogen ejector / ejector, a containing cavity, a flow adjusting valve, a moisture adjusting mechanism, a hydrogen circulating pump and a second direct-acting type electromagnetic valve which are arranged along a hydrogen conveying path, and the outlet end of the second direct-acting type electromagnetic valve leads to a path between the hydrogen ejector / ejector and the containing cavity; one or more of a pressure transmitter, a mass flow meter, a temperature transmitter and a humidity and temperature sensor is / are arranged near part or all of the hydrogen ejector / ejector, the containing cavity, the flow regulating valve, the humidity regulating mechanism and the hydrogen circulating pump in the pressure reducing valve, the hydrogen ejector / ejector, the containing cavity, the flow regulating valve, the humidity regulating mechanism and the hydrogen circulating pump. The device can be used as an independent system for operation test, can be conveniently transported, even disassembled and assembled, and is convenient for later maintenance and function change.

The utility model discloses a water electrolysis hydrogen production device which comprises a combustion boiler, an alkali liquor circulation pipeline, a heat exchange circulation pipeline and a hydrogen output pipeline. The alkali liquor circulation pipeline is mainly used for leading alkali liquor obtained after hydrogen separation and oxygen separation back to the electrolytic bath; a first heat exchanger and a second heat exchanger located at the downstream of the first heat exchanger are arranged on the heat exchange circulation pipeline, the first heat exchanger and the combustion chamber are arranged in a heat exchange mode, and the second heat exchanger and the alkali liquor circulation pipeline are arranged in a heat exchange mode; the hydrogen output pipeline is arranged on the hydrogen production side of the electrolytic cell and is used for conveying crude hydrogen produced on the hydrogen production side to downstream process equipment; and a fuel inlet of the combustion chamber is connected with the hydrogen output pipeline through a fuel supply pipeline and can be switched into a connected state and a disconnected state. According to the water electrolysis hydrogen production device, the starting efficiency of the water electrolysis hydrogen production process can be greatly improved, and the operation efficiency of the whole device is improved.

Provided is a high-strength steel sheet for a hydrogen transport steel pipe, which has excellent HISC resistance and excellent fatigue crack propagation resistance in a high-pressure hydrogen environment. This high-strength steel sheet for a hydrogen transport steel pipe contains, in mass%, 0.030-0.060% of C, 0.01-0.50% of Si, 0.80-1.80% of Mn, 0.015% or less of P, 0.0015% or less of S, 0.010-0.080% of Al, 0.05-0.50% of Cr, 0.005-0.080% of Nb, 0.005-0.020% of Ti, 0.0020-0.0080% of N, and 0.0005-0.0050% of Ca, the average Vickers hardness value + 3 [sigma] of 0.25 mm below the surface of the steel sheet being 225 HV or less, the upper 20% particle diameter of the center structure of the sheet thickness being 30 [mu] m or less, the fatigue crack propagation rate being less than 2.0 * 10-2 (mm / cycle) when the stress expansion coefficient range ([delta] K) is 45 ( and the tensile strength is 535 MPa or more.

The invention discloses a hydrogen brittleness performance evaluation method for a hydrogen transport pipeline, which comprises the following steps: obtaining the average hydrogen concentration in a sample through a high-pressure hydrogen permeation test of a wafer sample, and obtaining the hydrogen concentration and hydrogen diffusion coefficient of the surface of the sample under a specific electrochemical hydrogen charging condition through an electrochemical hydrogen charging test of the wafer sample; a finite element analysis model of a target sample is established to simulate the change relation of the total amount of hydrogen atoms in the target sample along with time under the electrochemical hydrogen charging condition, and the electrochemical hydrogen charging time equivalent to the high-pressure gaseous hydrogen charging is obtained by comparing the high-pressure gaseous hydrogen charging with the electrochemical hydrogen charging. The target sample is charged with hydrogen through an electrochemical hydrogen charging method, and finally the hydrogen embrittlement performance of the target sample is obtained through a hydrogen embrittlement performance test. According to the method, simple finite element simulation and electrochemical hydrogen charging are combined, high-pressure gaseous hydrogen charging which is complex, low in efficiency and high in danger is replaced, and the detection time of the hydrogen embrittlement performance test of the hydrogen charging pipe is shortened.

The invention provides an experimental device and method for testing the performance of a non-metal hydrogen conveying pipeline, and relates to the technical field of hydrogen conveying, in the experimental device, hydrogen enters a second non-metal hydrogen conveying testing pipeline, a third non-metal hydrogen conveying testing pipeline and a fourth non-metal hydrogen conveying testing pipeline after being cyclically pressurized and boosted through a cyclic compression unit; after the pressure is regulated and reduced by the pressure regulating and metering unit, the hydrogen is returned to the circulating and pressurizing module through the first non-metal hydrogen conveying test pipeline or the hydrogen conveying pipeline provided with the first valve to be circulated so as to drive the hydrogen conveying circulating loop, then the performance test of each non-metal hydrogen conveying test pipeline is carried out, and the hydrogen permeation test is carried out through the hydrogen permeation monitoring unit; and a joint hydrogen leakage test is carried out through the flange joint leakage monitoring unit. Therefore, hydrogen transportation circulation is realized through the experimental device constructed by the nonmetal hydrogen transportation test pipeline, and performance test, hydrogen permeation detection and joint leakage monitoring of the nonmetal hydrogen transportation pipeline are carried out in the hydrogen transportation circulation process, so that in-situ measurement simulation is realized.

The invention relates to the technical field of steel smelting, in particular to a pipeline steel plate for a hydrogen embrittlement-resistant high-pressure pure hydrogen conveying pipeline and a smelting method of the pipeline steel plate. The smelting process comprises the steps of converter smelting, CAS refining, LF refining, RH refining and continuous casting. In LF refining, oxygen is determined after molten steel arrives at a station, silicon iron is added for deoxidation, and the oxygen content of the molten steel is stabilized to be 20-80 ppm; 0.10-0.35 kg of ferrozirconium is added for each ton of steel in the LF refining process, and 0.50-0.80 kg of ferrotitanium is added for each ton of steel after heating is conducted for 5-10 min. Under the equipment condition of a conventional smelting mode, through a special deoxidation mode without adding aluminum, ferrozirconium, ferrotitanium and rare earth alloy materials are added according to a specific process, and the whole process of the smelting process is optimized, so that the purity of molten steel is improved, the morphology of inclusions is improved, absorption and diffusion of hydrogen are inhibited, and a structure refining and hydrogen trap system is stably formed; the prepared pipeline steel plate shows higher hydrogen embrittlement resistance in a high-hydrogen environment, and is particularly suitable for long-term service requirements in high-pressure, variable-load and water-containing hydrogen environments.

The invention relates to a method for installing a tank in a nacelle for a hydrogen-powered aircraft and an intermediate structure for the installation method. The invention relates to a method for mounting a compartment (2) containing at least a part of the equipment required to deliver dihydros to the engine of an aircraft, referred to as a hydrogen compartment, comprising the step of positioning the hydrogen compartment (2) in the cabin by means of a chassis (4) fixed to the cabin (1) and / or at least one track of the hydrogen compartment (2).

The utility model relates to the technical field of fluidized bed reactors, in particular to a cold hydrogen disc structure for an up-flow fluidized bed reactor, which comprises a reinforced vertical pipe, a cold hydrogen delivery pipe, a cold hydrogen ring pipe and a plurality of cold hydrogen distributors. Each cold hydrogen distributor comprises a gas inlet pipe communicated with the cold hydrogen ring pipe, a first distribution net transversely fixed in the middle of the gas inlet pipe, a one-way valve plate hinged to the inner side wall of the middle of the gas inlet pipe, a seal head fixed at the top of the gas inlet pipe and an anti-impact cover covering the outer side of the seal head; a second distribution net is fixed on the side wall of the upper part of the gas inlet pipe corresponding to the inner side of the anti-scour cover; a hydrogen outlet is formed in the bottom of the anti-scour cover. According to the hydrogen cooling disc structure, the overhigh temperature of raw materials or incompletely reacted raw materials can be reduced, and meanwhile, the problems of catalyst pulverization, deactivation, short service life and equipment damage caused by overlarge temperature difference between the upper part and the lower part and between the left part and the right part of a catalyst bed layer in the process are solved.

The invention discloses an in-situ metallurgical submerged-arc welding method for hydrogen storage / transportation material bypass high-nickel cold wires, and relates to the field of submerged-arc welding. The problem that hydrogen embrittlement and hydrogen induced cracking are prone to occurring in a hydrogen conveying pipe welding joint is solved. The frame body is fixed to a sliding plate of a submerged arc welding gun, the wire feeding wheel set is installed on the frame body and inputs high-nickel cold wires into a stable area of a molten pool in a stepless speed change mode, the Hall sensor detects the wire feeding speed in real time and feeds back speed signals to the servo driver of the wire feeding wheel set, and therefore closed-loop control over the wire feeding speed is achieved. According to the submerged-arc welding method, in the welding process, the bypass high-nickel cold wire is introduced, quantitative regulation and control over the nickel element content in a weld joint and accurate control over heat input of the weld joint are achieved by adjusting the wire feeding speed of the bypass high-nickel cold wire, and then the hydrogen embrittlement resistance of the weld joint is improved. The method is used for hydrogen storage / transportation material welding.

The invention discloses a nonmetal composite hydrogen conveying hose with a multi-form hydrogen blocking layer, and belongs to the technical field of hydrogen conveying hoses, the nonmetal composite hydrogen conveying hose comprises an external pipe, the bottom end of the external pipe is connected with a butt-joint pipe, the bottom end of the butt-joint pipe is connected with a composite hose, the bottom end of the butt-joint pipe is connected with a first sleeve in a penetrating mode, and the top end of the butt-joint pipe is connected with a second sleeve in a penetrating mode; the first sleeve is sleeved on the outer wall of the composite hose, the second sleeve is sleeved on the outer wall of the external pipe, a cavity is arranged in the butt-joint pipe, and a sealing measuring assembly is slidably connected in the cavity of the butt-joint pipe. A complete hydrogen conveying structure is integrally formed by a composite hose, a butt joint pipe and an external pipe, the butt joint pipe is fixedly connected with the composite hose and the external pipe in a sleeving mode through a first sleeve and a second sleeve, an inner cavity provides an installation and sliding space for a test sealing assembly, and the composite hose is of a multi-layer composite structure of a hydrogen conveying pipe, a first hydrogen blocking layer and a second hydrogen blocking layer. And a multi-form hydrogen blocking system with double hydrogen blocking layers and a hydrogen transporting base layer is formed.

The invention discloses a (FeNiMnCrV) Nx multilayer structure hydrogen resistance coating of a skin-like structure, and the (FeNiMnCrV) Nx multilayer structure hydrogen resistance coating is sequentially divided into a FeNiMnCrV sputtering layer, a (FeNiMnCrV) Nx foundation layer, a CrN middle layer, a (FeNiMnCrV) Nx-CrN circulation layer and a (FeNiMnCrV) Nx capping layer from bottom to top on the surface of a base material, hydrogen traps are generated between the interfaces, so that a large number of hydrogen atoms can be captured; obvious potential energy difference exists at different positions, and a rough energy rugged landscape is generated during hydrogen migration, so that hydrogen migration can be greatly inhibited; and the electron interaction between hydrogen and different metal elements is utilized to generate a remarkable local capture effect and limit long-range hydrogen transportation, so that most of hydrogen atoms are prevented from continuously permeating downwards, hydrogen absorption and hydrogen resistance are combined, and the hydrogen permeability is greatly reduced.

Methods and apparatus for hydrogen aircraft with cryogenic compressed storage are disclosed. An example fuel distribution system includes a vacuum vessel, a cryogenic vessel positioned within the vacuum vessel, the cryogenic vessel being part of a cryogenic compressed hydrogen delivery assembly, and at least one of a heater or a thermosyphon loop to maintain pressure of the cryogenic vessel.

The utility model relates to the technical field of mixed hydrogen conveying of natural gas pipelines, in particular to a static mixer for mixing natural gas and hydrogen, which comprises a mixer body, and a plurality of runner grooves are formed in the outer wall of the mixer body along the radial direction; the adjacent runner grooves are communicated through a plurality of runner holes; a plurality of first air inlet holes and second air inlet holes are formed in the mixer body in the radial direction, and the section shapes of the first air inlet holes and the second air inlet holes are different. Wherein the flow channel groove is used for guiding airflow; the runner holes are used for enabling inlet gas to generate a complex flow field; the first gas inlet hole and the second gas inlet hole can enable gas to generate different turbulent flows and disturbances; the static mixer is of an integrated structure and is simple in structure, low in machining cost, free of other movable parts, low in maintenance cost and easy to install. The problems that in the prior art, a static mixer is complex in structure, high in cost and poor in mixing effect are solved.

The application provides a smelting method of L245MH hydrogen conveying pipeline steel, and belongs to the field of steelmaking. The method comprises the following steps: performing KR pretreatment on molten iron, then performing twice deslagging treatment to obtain desulfurized molten iron; performing double-slag converter smelting on the desulfurized molten iron to obtain first molten steel; performing converter tapping on the first molten steel, and adding premelted slag into the molten steel to perform slag washing desulfurization treatment, thereby obtaining second molten steel; adding Al-Fe deoxidizer to the slag surface of the second molten steel, and controlling the ladle slag layer thickness of the second molten steel, thereby obtaining third molten steel; performing LF deep desulfurization refining on the third molten steel to obtain fourth molten steel; performing RH refining on the fourth molten steel, and controlling the circulating time after the last batch of materials is added, thereby obtaining fifth molten steel with a set Mn / Si mass ratio; using high-alkalinity tundish covering agent to cast the fifth molten steel, thereby obtaining a casting billet for L245MH hydrogen conveying pipeline steel. The content of S, P elements and inclusions in the steel is controlled.

The invention provides a leakage monitoring device for a hydrogen conveying composite pipeline, and relates to the field of hydrogen conveying pipes. The hydrogen conveying composite pipeline leakage monitoring device comprises a conveying pipe, a detection mechanism is arranged in the middle of the outer wall of the conveying pipe, the detection mechanism comprises a fixing strip and a cavity, data lines are fixedly connected to the interiors of the front end and the rear end of the fixing strip, a plurality of supporting blocks are fixedly connected to the interior of the cavity, and the supporting blocks are fixedly connected to the interior of the cavity. A first mounting cylinder is fixedly connected to the rear end of the middle of the upper surface of the fixing strip, and a gas sensor is arranged at the upper end in the first mounting cylinder. According to the splicing mechanism of the hydrogen conveying composite pipeline, the splicing pipes and the splicing rings are arranged, under connection of the splicing rings, a user can adjust the number of the conveying pipes between the splicing pipes according to requirements, and therefore the distance between the pipelines needing to be closed and isolated is adjusted; and therefore, the application range and the use convenience of the device are improved.

The invention discloses a pure steel smelting method for pure hydrogen conveying pipeline steel L245M. The adopted smelting process route comprises the steps of blast furnace-KR desulfurization-converter-LF refining-RH vacuum treatment-slab continuous casting. The pure hydrogen conveying pipeline steel L245M comprises the following chemical components in percentage by mass: 0.04 to 0.06 percent of C, 0.08 to 0.15 percent of Si, 0.90 to 1.15 percent of Mn, less than or equal to 0.013 percent of P, less than or equal to 0.0010 percent of S, 0.025 to 0.045 percent of Alt, 0.008 to 0.015 percent of Nb, less than or equal to 20ppm of O, less than or equal to 50ppm of N, less than or equal to 1.5 ppm of H and the balance of iron and inevitable impurities. The invention aims to meet the requirements of ultra-low S and P control and ultra-purity inclusion control of pure hydrogen conveying pipeline steel.

A spiral submerged arc welded pipe for a hydrogen transport pipeline, and a preparation method therefor. The preparation method comprises: (1) uncoiling an X52MS hot-rolled plate coil to obtain a steel strip, wherein the X52MS hot-rolled plate contains, in percentage by mass, C≤0.05%, Mn≤1.4%, P≤0.01%, S≤0.0015%, and CEPcm≤0.16; (2) performing edge milling on edges of the steel strip, such that welding grooves may be formed on the edge-milled steel strip after same is coiled; (3) coiling the edge-milled steel strip to obtain a spiral cylinder; and (4) using special hydrogen-resistant welding wires to weld the spiral cylinder by means of a double-wire tandem automatic submerged arc welding process, so as to obtain a spiral submerged arc welded pipe for a hydrogen transport pipeline. Thus, a spiral submerged arc welded pipe for a hydrogen transport pipeline that has good weldability, good comprehensive mechanical properties and high hydrogen resistance can be manufactured.