81 results about "Hydrogen purity" patented technology

The present application relates to hydrogen production technology field, especially to a kind of methanol hydrogen production method, comprising the following steps: S10: methanol water is heated and vaporized to obtain methanol water vapor;S20: methanol reforming reaction obtains hydrogen mixture gas;S30: after cooling treatment to hydrogen mixture gas, through water washing tower absorption unreacted methanol water, then, adjust the relative humidity and temperature of hydrogen mixture gas;S40: hydrogen mixture gas is input into carbon dioxide absorption tower to remove carbon dioxide;S50: after removing carbon dioxide, product hydrogen is obtained and input hydrogen tank storage to supply user end.The above-mentioned methanol hydrogen production method, by methanol water vapor reforming hydrogen treatment, obtains hydrogen mixture gas.Again, hydrogen mixture gas is purified to obtain product hydrogen with very low carbon monoxide content, with raw material easy to transport, the hydrogen purity of output is high, equipment construction cost is low, and energy consumption is low and the like advantages, reach the purpose of expanding hydrogen application range.

The utility model discloses a multi-stage treatment system for high-salinity wastewater, which comprises a water sample detection and analysis system for sampling and analyzing the high-salinity wastewater in at least three batches to obtain the pH value, COD (Chemical Oxygen Demand), TDS (Total Dissolved Solids), hardness and the numerical value range of each pollutant content of the wastewater; the ozonization system is used for fully contacting the detected and analyzed high-salinity wastewater with ozone to obtain ozonized effluent; the pretreatment system is used for settling and filtering the ozonized effluent to obtain pretreated effluent and a pretreated concentrated solution; the electrolytic hydrogen production system is used for carrying out in-situ electrolysis on the pretreated effluent to obtain hydrogen, oxygen and a wastewater concentrated solution; the membrane distillation system is used for carrying out membrane distillation treatment on the wastewater concentrated solution to obtain pure water and a membrane distillation concentrated solution; the evaporation system is used for carrying out evaporation treatment on the pretreatment concentrated solution and the membrane distillation concentrated solution to obtain solid waste. According to the utility model, the wastewater utilization rate is greater than 80%, the hydrogen purity is greater than 99.9%, and the TDS of membrane distillation pure water is less than 50mg / L.

The invention relates to the technical field of gas adsorption materials, in particular to special silica gel for pressure swing adsorption hydrogen extraction and a preparation method thereof. The special silica gel for pressure swing adsorption hydrogen extraction comprises pretreated adsorption silica gel and advanced treatment adsorption silica gel, wherein the pretreated silica gel is specially used for capturing polar molecules; and the silica gel is deeply treated to accurately adsorb small-molecule gas. During preparation, a graded functionalization strategy is adopted, the stability of a silica gel framework is enhanced through acid activation, a multi-stage adsorption interface is constructed through amino / fluorocarbon directional grafting, and active components are fixed through chemical bonding to avoid loss. During application, a double-tower pressure swing adsorption process is adopted, the pretreatment adsorption tower preferentially removes strong adsorbate, the deep treatment adsorption tower improves hydrogen purity through hydrophobic screening, and gradient pressure reduction and pulse nitrogen desorption technologies are matched, so that efficient regeneration of the adsorbent is realized. A single material system breaks through a mass transfer barrier of a traditional multi-adsorbent combination, has the characteristics of high-selectivity adsorption and low-energy-consumption desorption, and is suitable for efficient recovery of hydrogen resources in synthesis ammonia tail gas.

The invention discloses an AEM hydrogen production system adapting to variable working conditions and a start-stop control method of the AEM hydrogen production system. The AEM hydrogen production system comprises a working condition sensing module, a dynamic cooperative control module, a self-adaptive start-stop module, an electrolytic bath unit, an electrolyte circulating unit and a hydrogen purification unit, the method comprises the steps that when starting and stopping are triggered, the working condition sensing module collects multiple parameters, the dynamic cooperative control module calculates a working condition adaptation coefficient and adjusts electrolysis parameters, and the self-adaptation starting and stopping module executes the starting and stopping process in stages. Through multi-module parameter linkage, the problem that electrolysis parameters are not matched under variable working conditions is solved, the hydrogen production efficiency and the hydrogen purity are improved, membrane damage in the start-stop stage is reduced, and stable operation of the system is guaranteed.

The invention belongs to the technical field of methanol hydrogen production, and discloses an online methanol hydrogen production global control system, which comprises a feeding and evaporation unit, a reforming reaction unit, a gas purification and separation unit, a hydrogen storage and supply unit, a multi-source sensor group and a controller, the controller comprises a soft measurement module, a double-layer model prediction control module and a safety degradation module, and the soft measurement module estimates CO concentration in real time based on characteristics such as a temperature field, pressure drop and heating power. The double-layer model predictive control module realizes comprehensive optimization of hydrogen purity, energy efficiency and catalyst life through combination of inner-layer steady-state control and outer-layer economic optimization, and the safety degradation module triggers limited power or inerting purging operation under abnormal conditions. According to the invention, the whole-process optimal control from feeding, reaction, purification to hydrogen supply can be realized, the hydrogen purity and the system efficiency are improved, the CO concentration fluctuation is reduced, the service life of the catalyst is prolonged, and continuous and safe hydrogen supply is still maintained under the condition of sensor failure or operation disturbance.

The utility model discloses a hydrogen purity measuring device for hydrogen cooling generator belongs to hydrogen cooling generator accessory technical field, including the inner cooling water tank, the inner cooling water tank top is provided with the mounting hole, the mounting hole inside fixedly connected with the sealed connecting piece, sampling measurement mechanism, sampling measurement mechanism includes a plurality of sampling tubes, a plurality of sampling tubes's middle part all with sealed connecting piece through fixed connection, one end all stretches into the inner top of inner cooling water tank, and the other end is connected with same current -collecting main pipe. The utility model discloses through setting up a plurality of sampling tubes, multi -point site pertinence sampling, eliminates the detection blind area, and sampling tube stretches into the inner top of inner cooling water tank, and covers the edge corner dead angle, hydrogen gas air inlet nearby, inner cooling water exhaust port nearby etc.

The invention discloses an efficient gas-liquid separation device for hydrogen production through water electrolysis and capable of preventing water pollution, and relates to the technical field of hydrogen-liquid separation through electrolysis, the efficient gas-liquid separation device comprises AEM hydrogen production equipment and a first assembly installed on the AEM hydrogen production equipment, and the AEM hydrogen production equipment comprises a heat exchange assembly, a circulating water tank, an AEM electrolytic cell, an interface panel and a gas-liquid separation assembly; the mixed product airflow drives the forward blade part to rotate, the spiral acceleration effect of arc-shaped twisted blades can further enhance the strength of a centrifugal force field, the capture efficiency of the arc-shaped blades on airflow kinetic energy is improved, and stable high-speed rotation of the blades is ensured; the forward blade component drives the reverse blade component to rotate reversely through linkage bevel gear transmission, a sawtooth-shaped inclined structure of a reverse blade and airflow form a shear angle, liquid drop aggregate which is not completely separated can be efficiently crushed, the escape rate of tiny liquid drops is reduced through the cutting effect of the sawtooth edge on a central vortex, the gas-liquid separation efficiency is overall improved, and the gas-liquid separation efficiency is improved. The hydrogen purity is improved.

The application discloses a three-tower series connection pressure swing adsorption device and a pressure equalization process thereof, adopts a set of pressure swing adsorption device, sets a multi-step series connection pressure equalization process, and adopts a three-tower simultaneous adsorption mode, so that the yield is obviously improved, the energy consumption and equipment investment are reduced, and the product gas quality is guaranteed. The three-tower series connection pressure swing adsorption device is used for pressure swing adsorption hydrogen extraction, the product hydrogen yield is obviously higher than that of an existing first-stage pressure swing adsorption hydrogen extraction device under the premise that the product hydrogen purity and impurity content meet high-purity hydrogen requirements, the three-tower series connection pressure swing adsorption device is used for pressure swing adsorption oxygen production and nitrogen production, and unit oxygen production power consumption and unit nitrogen production power consumption are obviously lower than the minimum index requirements in related standards under the premise that oxygen purity and nitrogen purity meet basic parameter requirements.

The application relates to the technical field of hydrogen production control by electrolysis of water, and discloses an alkali electrolysis system energy consumption-temperature-purity collaborative prediction control method, which acquires operation data and control targets of an alkali electrolysis system, generates a plurality of candidate operation conditions according to the operation data, the control targets and equipment operation ranges; predicts electrolytic cell voltage, hydrogen production, oxygen production and unit hydrogen production energy consumption corresponding to the candidate operation conditions through an electrochemical model; predicts electrolytic cell temperature state through a thermal model; predicts hydrogen purity and oxygen purity through a gas purity model; performs coupling evaluation on the unit hydrogen production energy consumption, the electrolytic cell temperature state, the hydrogen purity and the oxygen purity to form a collaborative prediction result, determines a target operation condition from the candidate operation conditions meeting constraint conditions, and outputs corresponding control parameters; and corrects model parameters according to actual operation data. The alkali electrolysis system operation condition selection rationality can be improved.

The utility model discloses a kind of hydrogen fine desulfurization purification devices, it relates to hydrogen purification technical field, the hydrogen fine desulfurization purification device, including purification box, the outer wall one side of purification box is fixedly connected with support frame, the top end of support frame is fixedly connected with top end air inlet tank by connecting top seat, one end of top end air inlet tank is fixedly connected with air inlet pipe by jar mouth one, the inner wall of top end air inlet tank is fixedly connected with multiple fixed frame, the inner wall of multiple fixed frame is fixedly connected with filter plate one, the bottom of support frame is fixedly connected with multiple base, the top of multiple base is fixedly connected with flushing dust removal tank, the outer wall of flushing dust removal tank is fixedly connected with multiple fixed ring.The utility model hydrogen fine desulfurization purification device, it has the sulphide and other impurities in hydrogen can be effectively removed, hydrogen purity promotes advantage, and compared with traditional wet desulfurization, a large amount of wastewater generation is reduced, and environmental pollution risk is reduced.

The invention relates to the field of natural gas hydrogen doping, and particularly discloses a methanol hydrogen production and doping system and a methanol hydrogen production and doping method suitable for existing natural gas gate station reconstruction from the perspective of engineering design, and the methanol hydrogen production and doping system comprises a skid-mounted methanol reforming hydrogen production module which comprises a methanol storage tank, a catalytic reforming reactor and a heat conduction oil circulation unit, the catalyst is used for generating hydrogen-containing mixed gas through catalytic reforming reaction; the pressure swing adsorption purification module and the COcapture module are connected with an outlet of the catalytic reforming reactor; through the skid-mounted modular design, the system can be rapidly deployed by directly utilizing existing facilities of the natural gas gate station, huge investment for newly building a hydrogen conveying pipeline is omitted, the danger of hydrogen conveying is avoided, meanwhile, the energy consumption cost in the hydrogen production process is greatly reduced through a heat recovery mechanism of the heat conduction oil circulation unit, and the energy consumption is reduced. And efficient utilization of energy is realized. The pressure swing adsorption purification module is combined with the COtrapping function, so that the hydrogen purity is greatly improved, the COtrapping rate of 99% or above is achieved, and carbon emission is effectively reduced.

The utility model relates to a device for gas-liquid separation belongs to hydrogen fuel cell engine hydrogen supply circulation system's gas-liquid separation technical field, aiming at the problem that separation efficiency and system resistance are difficult to balance in prior art, cannot give consideration to different particle size droplet separation and impurity gas discharge, the device includes upper casing and lower casing, the upper casing is divided into rough filter cavity and fine filter cavity through vertical partition, is equipped with radial guide component and I -shaped impact separation component in rough filter cavity, is equipped with cyclone separator with inner cylinder in fine filter cavity, and lower casing forms water collecting cavity, gas-liquid mixture is guided to impact separation component and separates big droplet after being guided to guide component, enters cyclone separator and separates small droplet through centrifugal force, and separated liquid converges into water collecting cavity, and the outlet cavity passes through hydrogen concentration sensor control impurity gas discharge, the utility model realizes different particle size droplet high -efficient separation, reduces system resistance, guarantees that hydrogen purity meets the requirement, promotes hydrogen recycling rate, is applicable to hydrogen fuel cell engine hydrogen supply circulation system.

This invention belongs to the field of biochar gasification hydrogen production technology, specifically designing a method and apparatus for preparing high-purity hydrogen, including the following steps: S1, a mixture of biochar and sodium borate is fed into the apparatus for crushing, drying, and preheating; S2, the mixture from step S1 is fed into a reaction chamber, and carrier gas and steam are introduced for a high-temperature reaction, yielding a mixed gas and solid waste; S3, the mixed gas from step S2 is passed through a gas-solid separator and a pressure swing adsorption device, finally reaching a hydrogen-rich collection device to obtain high-purity hydrogen; S4, the solid waste from step S2 is fed into a waste residue treatment tank, and after heating treatment, regenerated sodium borate is generated. The regenerated sodium borate and biochar are then taken out and fed back into the apparatus for recycling. This invention uses biochar as raw material and couples it with a sodium borate recycling process, offering advantages such as high hydrogen purity, low carbon footprint, environmental friendliness, and sustainable operation, providing an efficient and feasible technical solution for biochar hydrogen production.

The utility model discloses a methane cracking hydrogen production and carbon product continuous separation and purification device which mainly comprises a methane cracking reaction part for providing a reaction space for methane cracking reaction, a carbon product separation and collection part for realizing separation of a carbon product and metal catalyst impurities and facilitating collection of the carbon product, and a carbon product separation and collection part for realizing separation of the carbon product and metal catalyst impurities. The catalyst feeding part is used for timely supplementing a catalyst consumed in the reaction process, and the gas circulating part is used for recycling uncracked methane, improving the yield of hydrogen production through methane cracking and reducing methane gas waste. According to the utility model, methane is cyclically cracked in the molten metal catalyst, so that the methane cracking efficiency is improved; by collecting and purifying a carbon product, the operation cost is reduced, the hydrogen purity is improved, clean energy is generated, and carbon-free emission of energy is realized.

This invention discloses a high-hydrogen-density liquid organic hydrogen carrier and its applications, belonging to the field of hydrogen energy storage and utilization technology. The liquid organic hydrogen carrier is a composite system of a functionalized nitrogen-containing heterocyclic compound and a metal-organic framework material supported on a non-precious metal catalyst. The nitrogen-containing heterocyclic framework is connected with electron-donating and electron-withdrawing groups, constructing an intramolecular electron push-pull system. The non-precious metal catalyst is supported inside the pores or on the surface of the metal-organic framework material. Through molecular structure design and catalyst system optimization, this invention achieves a hydrogen storage density of not less than 7.0 wt%, a dehydrogenation onset temperature of not more than 150℃, and a dehydrogenated hydrogen purity of not less than 99.99%, with excellent cycle stability and low catalyst cost. This liquid organic hydrogen carrier can be widely used in renewable energy storage, long-distance hydrogen transportation, vehicle-mounted hydrogen sources, and distributed energy supply systems.

The invention discloses a collaborative optimization hydrogen production system and method based on hydrogen purity and hydrogen evolution overpotential. The collaborative optimization hydrogen production system based on hydrogen purity and hydrogen evolution overpotential comprises an electrolytic bath, a hydrogen purity detection device, a power supply, an electrical parameter detection device, a first auxiliary parameter detection device and a second auxiliary parameter detection device. According to the collaborative optimization hydrogen production method based on the hydrogen purity and the hydrogen evolution overpotential, data are collected in real time, and the size and the change trend of the hydrogen evolution overpotential are mastered in real time through accurate calculation, so that real-time collaborative optimization adjustment is facilitated. According to the scheme, the purity requirements of different industrial-grade, vehicle-mounted and electronic-grade scenes can be met by detecting the hydrogen purity in real time, calculating the hydrogen evolution overpotential in real time and cooperatively optimizing and adjusting the parameters of the power supply, so that the cost of the whole hydrogen production system is reduced; when the purity or the overpotential is abnormal, the power supply can be quickly adjusted, the corrosion loss of the electrode can be reduced, the service life of the electrode is prolonged, and the annual maintenance cost is reduced.

The application discloses a design, construction and operation parameter optimization method of a high-impurity salt mine hydrogen storage library. Through early drilling and coring and testing, the influence of mineral composition and microorganisms in the salt layer on hydrogen purity is accurately evaluated, so that suitable salt-containing strata that can be used for hydrogen storage are screened out before construction, and the shape of the salt cavity is detected and the sealing property of the salt cavity is tested; in combination with sediment connectivity and porosity test data, the hydrogen storage capacity of the cavity is evaluated; the depth of the hydrogen-halogen water interface in the cavity is controlled to ensure the formal operation of the hydrogen storage cavity, and the hydrogen storage efficiency can be improved in combination with the production mode of hydrogen without a cushion bottom; thus, a hydrogen storage library meeting the hydrogen storage requirements is constructed in the high-impurity salt mine, and efficient utilization of the poor salt mine is realized.

This invention discloses an online hydrogen purity monitoring system and method for electrolyzers, belonging to the field of electrolytic hydrogen production. It includes a condenser dryer, a hydrogen-oxygen detector, a deoxygenator, a drying tower, a connector, valve one, valve two, a filter, and a hydrogen purity detector. The system performs online real-time monitoring of hydrogen purity before and after purification in the electrolyzer system. It can simultaneously evaluate the hydrogen-oxygen barrier performance of the electrolyzer and the effectiveness of downstream hydrogen treatment. Furthermore, it miniaturizes and integrates the equipment for hydrogen purity detection into the electrolyzer system. This invention enables rapid and accurate evaluation of hydrogen purity parameters in the electrolyzer system.

The application discloses a kind of based on hydrogen balance method's heavy hydrogen fuel internal combustion engine car fuel consumption test method, comprising: the fuel component of heavy hydrogen fuel internal combustion engine car used in accordance with predetermined standard is analyzed to obtain the hydrogen purity of fuel and fuel density;In vehicle CHTC driving cycle, the hydrogen content of exhaust emission unit mileage of CHTC driving cycle is measured and calculated;Based on the hydrogen purity of fuel obtained, fuel density and the hydrogen content of exhaust emission unit mileage, the fuel consumption of vehicle driving cycle is calculated.The application derives the fuel consumption of whole vehicle by measuring the emission mass of hydrogen component in vehicle exhaust emission, based on hydrogen element mass conservation, without damaging the original vehicle hydrogen supply system of whole vehicle, and the test safety is high, and operability is strong.

The utility model discloses an industrial by -product hydrogen purification system relates to hydrogen purification technical field. After the active carbon adsorption unit processing of the utility model, again through the adsorption of three TSA adsorption towers in TSA adsorption unit, the hydrogen purity after purification is equal to or greater than 99.999%, and the process does not need to consume the chemical reagent that can produce a large amount of waste liquid, and the process is simple.

The invention discloses an electrolytic bath performance evaluation and operation load optimization method and device and a medium, and relates to the technical field of electrolytic bath evaluation, and the method comprises the steps: obtaining low-load test data of an electrolytic bath in a low-load operation state; the low-load test data comprises hydrogen purity, oxygen purity, unit tank voltage of each unit tank, actually measured circulating alkali concentration and test duration; calculating a membrane pinhole index according to the hydrogen purity, the oxygen purity and the unit groove voltages of all the unit grooves; calculating the attenuation index of the coating according to the unit tank voltages of all the unit tanks, the actually measured circulating alkali concentration and the test duration; evaluating the performance of the electrolytic cell according to the membrane pinhole index and the coating attenuation index to obtain a comprehensive health index of the electrolytic cell; and performing optimization decision on the operation load of the electrolytic cell according to the health comprehensive index of the electrolytic cell, and determining an electrolytic cell optimization decision measure. The method can realize accurate evaluation of the performance of the electrolytic cell while maintaining continuous production.

The application discloses an electricity-heat-hydrogen combined supply device and method based on biomass gasification, which comprises a biomass gasification unit, a chemical chain hydrogen production unit, a gas turbine power generation unit, a steam turbine power generation-heat supply unit and pipelines. Compared with a traditional solid fuel gasification hydrogen production device, the application has a simple process, only needs to go through three stages of gasification, combustion and water decomposition hydrogen production, and the hydrogen purity is as high as 99% or more. The self-heating of the hydrogen production unit and the reaction temperature thereof are realized by adjusting the air amount entering the air reactor. The proportion of hydrogen and power generation is adjusted by adjusting the proportion of the synthesis gas entering the chemical chain hydrogen production unit and the gas turbine unit. The proportion of power generation and heat supply is adjusted by adjusting the steam extraction amount or the steam extraction point position of the steam turbine, so that the proportion among power generation, heat supply and hydrogen production of the device can be flexibly adjusted.

Present disclosure relates to process for increasing the purity and recovery of hydrogen product stream obtained from a dehydrogenation process. The dehydrogenated effluent stream is separated to obtain the net gas stream. The net gas stream is compressed in a hydrogen compressor section. Even after compressing the net gas, traces of toluene are still present in the gas phase. Applicants have found to recover these toluene traces, the compressed gas from the hydrogen compressor section is chilled in a vapor economizer followed by a chiller to produce a chilled stream at a temperature of from about -27°C to about 17°C. This process also helps maintain the Wobbe Index of the hydrogen product stream in the range of about 44 to about 49 MJ / m3. In another embodiment, the compressed net gas stream from the hydrogen compressor section is adsorbed in an adsorption unit to separate hydrogen product stream from the recycle gas stream, wherein the recycle gas stream is completely recycled to the hydrogen compressor.

This invention relates to a supported cerium-zirconium solid solution photocatalyst, its preparation method, and its application in the catalytic reaction of organic liquid hydride dehydrogenation for solar energy storage, belonging to the field of solid solution photocatalyst technology. The invention first prepares a cerium-zirconium solid solution using an alkaline solution co-precipitation method or a reducing agent combustion method, and then prepares a supported cerium-zirconium solid solution photocatalyst using a chemical deposition method or a photodeposition method. The invention also relates to a conversion device for capturing and storing solar energy. In the solar-driven cyclohexane dehydrogenation catalytic reaction, the supported cerium-zirconium solid solution photocatalyst prepared in this invention exhibits excellent catalytic activity and stability, with a hydrogen production rate as high as 2.89 mol·g⁻¹. Pt ‑1 ·min ‑1 The system has a turnover rate exceeding 100,000 times and a hydrogen purity exceeding 99.99%. The dehydrogenation catalytic reaction system described in this invention can effectively absorb ultraviolet, visible, and near-infrared light from sunlight, opening up new avenues for the widespread application of solar energy.

This invention relates to the field of chemical waste gas resource utilization and environmental protection technology, specifically disclosing a cyclohexylamine hydrogen-containing waste gas recovery and reuse treatment system. It includes pretreatment, separation and purification, regeneration, closed-loop control, and recycling units connected in series, forming a closed loop through corrosion-resistant and heat-insulated pipelines. The pretreatment unit uses a composite absorbent to deeply remove impurities such as ammonia and organic amines from the waste gas; the separation and purification unit uses a composite membrane, functionalized adsorption tower, and PSA module for gradient hydrogen separation; the regeneration unit realizes the recycling of the composite absorbent; the closed-loop control unit adjusts parameters in a coordinated manner; and the recycling unit reuses high-purity hydrogen for production. This invention achieves thorough impurity removal, high hydrogen purity, high recovery rate, recyclable absorbent, and low energy consumption, effectively solving the technical problems of incomplete hydrogen-amine separation, easy adsorbent poisoning and deactivation, and insufficient hydrogen purity in traditional technologies, thus realizing waste gas resource utilization and green production.

A system for generating power may include a fuel cell stack including one or more hydrogen fuel cells. The system may be operated in one or more modes based on a hydrogen purity of fuel supplied to the stack. A method of operating a fuel cell stack is also disclosed.

The invention discloses a preparation method and application of a Mg-doped porous microsphere Ca-Fe bifunctional oxygen carrier, a one-pot hydrothermal template method is adopted for preparation, and Mg doping modification is synchronously adopted, so that the hydrogen production performance, sintering stability, cycle durability and CO2 adsorption capacity of the oxygen carrier are remarkably improved; the obtained Mg-doped porous microsphere Ca-Fe bifunctional oxygen carrier has excellent stability, can be regenerated after being calcined in an air atmosphere and at a high temperature, provides key support for hydrogen production and CO2 capture processes, and can adsorb CO2 in situ, improve hydrogen purity, promote reaction equilibrium to move towards a hydrogen production direction and improve hydrogen production efficiency in a biomass gasification synthesis gas reaction stage; adsorbed CO2 can be collected in a high-temperature calcination stage, and the purpose of carbon capture is achieved.

The application relates to a methanol reforming double-hydrogen supply system for stainless steel processing, and belongs to the fields of methanol hydrogen production technology and stainless steel processing. The system comprises a methanol reforming hydrogen production module, a heat exchange module, a gas-liquid separation module, a PSA purification module, a natural gas hydrogen mixing module, a methanol storage tank, a water storage tank, a methanol aqueous solution storage tank, a methanol feeding pump, a water feeding pump, a methanol aqueous solution feeding pump and corresponding connecting pipelines; wherein the methanol reforming hydrogen production module comprises a vaporizer, a heater and a reformer; the gas outlet of the gas-liquid separation module is connected with the PSA purification module and the natural gas hydrogen mixing module respectively; high-purity hydrogen prepared by the PSA purification module is used as protective gas required during stainless steel processing; and natural gas hydrogen mixing gas prepared by the natural gas hydrogen mixing module is used for combustion to generate high temperature required during stainless steel processing. The system is simple in equipment, adjustable in hydrogen production amount and hydrogen purity, pollution-free, energy-saving and low in cost, and can be applied to the field of stainless steel processing.

The invention relates to the technical field of chemical engineering and energy environmental protection, in particular to a hydrate solidification and separation method for improving the hydrogen recovery rate of tail gas of a hydrogenation technology, which comprises the steps of pretreatment, hydrate generation, gradient heating decomposition and drying treatment. By introducing a specific accelerant solution and optimizing process conditions, the hydrogen separation selectivity and recovery efficiency are remarkably improved. Experiments show that the method can achieve the hydrogen recovery rate of 95%-98% and the hydrogen purity of 99.9% or above, solves the problems of low recovery efficiency, high energy consumption and complex equipment in the prior art, and meets the requirements of the industrial field for the efficient and economical hydrogen recovery technology.

The invention belongs to the technical field of water electrolysis hydrogen production, and relates to a multistage ionic membrane coupling system and method for water electrolysis hydrogen production. Comprising a raw material water treatment unit, a multi-stage ionic membrane electrolytic cell, a hydrogen side separator and a gradient water replenishing tank, the raw material water treatment unit comprises a reverse osmosis device and an electrodialysis device which are sequentially connected; the electrodialysis device is connected with a first water inlet of the multi-stage ionic membrane electrolytic cell; an anode layer, a composite ion exchange membrane and a cathode layer are sequentially arranged in the multi-stage ion membrane electrolytic bath from bottom to top; a hydrogen outlet is formed in a cathode layer of the multi-stage ionic membrane electrolytic bath; an oxygen outlet is formed in an anode layer of the multi-stage ionic membrane electrolytic bath; the hydrogen outlet is connected with a gas-liquid mixing inlet of the hydrogen side separator; a liquid outlet of the hydrogen side separator is connected with a second water inlet of the multi-stage ionic membrane electrolytic cell; and the gradient water replenishing tank is connected with a liquid inlet of the hydrogen side separator. The effects of reducing the energy consumption, improving the hydrogen purity and enhancing the operation stability are achieved.