647results about "Nitrogen purification/separation" patented technology

The invention provides an inert gas generation system, and relates to the technical field of industrial gas production. The inert gas generation system comprises the following modules: a gas pretreatment module, an intelligent separation module, a dynamic purification module, a pressure regulation and control module, a quality analysis module, a safety control module and an energy efficiency optimization module, and the gas pretreatment module is used for removing particulate matters through an electrostatic dust collection device by adopting a multi-stage gradient filtering algorithm based on ambient air input, adjusting humidity by combining a dew point control technology, forming a standardized gas source and generating a standard gas source. Through combination of a multi-stage gradient filtering algorithm and a dew point control technology, collaborative treatment of particulate matters and humidity is realized, stable gas source input is formed, the reliability of a subsequent processing link is improved, membrane separation parameters are dynamically predicted by applying a convolutional neural network model, and the permeation efficiency of a hollow fiber membrane stack is optimized.

The utility model relates to a gas diffusion cascade device for preparing high-abundance nitrogen-15 isotopes by taking nitrogen as a medium. The gas diffusion cascade device comprises a first gas diffusion cascade, a second gas diffusion cascade, a photocatalysis / electro-catalysis device and a high-speed magnetic suspension gas compressor, the first gas diffusion cascade and the second gas diffusion cascade are ladder cascade and respectively comprise a plurality of gas diffusion separation devices; the photocatalysis / electrocatalysis device is positioned between the first gas diffusion cascade and the second gas diffusion cascade; the high-speed magnetic suspension gas compressor is positioned in front of each gas diffusion and separation device in the nitrogen flowing direction; and obtaining the high-abundance nitrogen-15 isotope prepared by taking nitrogen as a medium from the heavy fraction end of the second gas diffusion cascade. The gas diffusion cascade device is high in separation coefficient, large in flow and high in efficiency, the prepared nitrogen-15 isotope abundance is high, and the gas diffusion cascade device is suitable for industrial application.

The invention discloses a PSA oxygen production and nitrogen recovery cooperative control method and system, and relates to the technical field of gas separation. The method comprises the following steps: establishing a dynamic multi-target evaluation function comprising a plurality of performance indexes such as air compressor energy consumption, vacuum pump energy consumption, oxygen purity and nitrogen recovery rate, and collecting pressure, temperature, gas components and flow data in an adsorption tower in real time; in the adsorption stage, based on the real-time data and the current oxygen demand, a first machine learning model is used for generating and executing a dynamic pressure adjusting strategy for the air compressor; in a desorption stage, predicting an optimal vacuum degree curve based on historical desorption data by utilizing a second machine learning model, generating a start-stop and pumping rate control strategy of the vacuum pump according to the optimal vacuum degree curve, and determining the recovery rate of the vacuum pump according to a comparison result of the real-time nitrogen concentration and a preset recovery concentration threshold value. And desorption airflow is controlled to enter the nitrogen recovery pipeline or be directly discharged through the valve.

The invention provides an improved ammonia production system based on a temperature swing adsorption principle. The improved ammonia production system comprises a water electrolysis hydrogen production module, a deep cooling air separation nitrogen production module, a multi-stage ammonia synthesis tower module and a double-bed circulating adsorption separation ammonia module, the water electrolysis hydrogen production module and the deep cooling air separation nitrogen production module provide raw material gas for the multi-stage ammonia synthesis tower module through a mixer, low-grade waste heat of a multi-stage ammonia synthesis tower serves as a heat source of the double-bed circulating adsorption separation ammonia module, and the double-bed adsorption separation ammonia module is connected with the multi-stage ammonia synthesis tower. The working conditions of an adsorption bed of the double-bed ammonia adsorption and separation module comprise an adsorption working condition and a desorption working condition, the adsorption bed alternately performs the adsorption working condition and the desorption working condition within the operation time, and low-grade waste heat from a multi-stage ammonia synthesis tower is used for driving to perform separation operation on ammonia synthesis gas so as to obtain high-purity ammonia; according to the invention, the operation pressure in an ammonia product separation project can be effectively reduced, circulation is formed, and the purity and the recovery rate of the obtained ammonia product are not reduced while the waste heat in the system is further utilized.

The invention relates to the technical field of gas purification, and discloses a methane-removing nitrogen automatic regeneration type purification method which comprises the following steps: pretreatment of raw material gas: controlling the pressure and flow of a raw material gas inlet, and introducing the raw material gas into a gas-gas heat exchange device for primary heat exchange; performing catalytic reaction to remove methane: injecting oxygen into the raw material gas, mixing, heating by a heating device, introducing into a catalytic barrel, reacting methane with oxygen by using a rare metal catalyst to generate water and carbon dioxide, and automatically adjusting the oxygen injection amount by detecting the content of methane and oxygen in the gas at the outlet of a catalytic system, maintaining the temperature in the catalytic barrel in a specified interval; and cooling treatment: sequentially passing the raw material gas from which methane is removed through a gas-gas heat exchange device and a water-cooling heat exchange device, and cooling the raw material gas to a specified temperature. The methane removal nitrogen automatic regeneration type purification method aims at solving the problems that a purification system is low in regeneration efficiency and insufficient in automation degree.

The invention discloses a mixed matrix membrane for efficient oxygen and nitrogen separation and a preparation method and application thereof. The mixed matrix membrane comprises a polymer continuous phase and an MOF filler uniformly dispersed in the polymer continuous phase, the MOF filler can separate nitrogen and oxygen, and the surface of the MOF filler is modified by the silane coupling agent, so that the MOF filler is well compatible with a polymer, and the oxygen-nitrogen separation effect is improved. The polymer solution and the MOF filler dispersion liquid are mixed, the mixed matrix membrane is prepared through the non-solvent induced phase separation method, and the method has the advantages of being simple in reaction condition, high in efficiency, easy to amplify and the like and has wide engineering prospects.

The invention relates to a nitrogen making method and device for a refrigerator cabin, a refrigerator and a computer readable storage medium, and the method comprises the steps that a nitrogen making module of the refrigerator comprises an air pump and a molecular sieve tower, the air pump is connected with the molecular sieve tower, and the air pump is used for inputting air into the molecular sieve tower; the molecular sieve tower is used for separating nitrogen in air and inputting the nitrogen into a target cabin of the refrigerator. The method comprises the steps that the target nitrogen concentration is obtained according to the fruit and vegetable fresh-keeping requirement in the target cabin; adjusting the working pressure of the air pump according to the target nitrogen concentration; wherein the higher the target nitrogen concentration is, the higher the working pressure of the air pump is; the lower the target nitrogen concentration is, the smaller the working pressure of the air pump is. By adopting the method, the problem that the nitrogen and oxygen concentration in the refrigerator cabin cannot be adjusted to the ideal concentration can be solved.

The utility model relates to an environment-friendly nitrogen-making device for alcohol ketone tail gas. The environment-friendly nitrogen-making device comprises a tail gas compression unit, a catalytic oxidation purification unit, a freeze dehydration unit, a pressure swing adsorption unit, a nitrogen storage and conveying unit and a nitrogen purification unit, the technology is characterized in that all units are connected in sequence, and specifically, a tail gas compression unit comprises a tail gas buffer tank, a filter, a compressor, a cooler and a liquid separator; the catalytic oxidation purification unit comprises a heat exchanger, a heater, a reactor, a catalyst and a water cooler; the freezing dehydration unit comprises a refrigerating unit, a refrigerator and a water segregator; the pressure swing adsorption unit comprises an adsorber, an adsorbent, a vacuum pump and a desorption gas buffer tank; the nitrogen storage and conveying unit comprises a nitrogen buffer tank and a nitrogen pipe network. According to the technology, the alcohol ketone tail gas can be purified and recycled to be used for producing nitrogen, environment-friendly emission reaches the standard, meanwhile, high-purity nitrogen is recycled, and environmental pollution and resource waste are reduced.

The present invention belongs to the technical field of industrial flue gas carbon capture, and particularly relates to a system and method for realizing carbon and nitrogen co-production by using the dry coke quenching off-gas. The system includes a dry coke quenching circulating gas system, a desulfurization reactor, a fine desulfurizer, a first induced draft fan, a heat exchanger, a catalytic reactor, a waste heat boiler, a second induced draft fan, a spray cooling tower, a decarbonization absorption tower, a regeneration tower and a condensation tower. The system and method of the present invention make full use of the characteristics of high CO concentration and low oxygen content in the dry coke quenching off-gas, and utilize the dry coke quenching off-gas from the perspectives of calorific value utilization and low-oxygen purified gas, which not only solves the problems of energy waste and environmental pollution caused by the discharge of high-calorific value components in the off-gas, but also makes full use of the characteristics of the off-gas to produce purified gas with low oxygen content, crude nitrogen, high-concentration CO2, and rich in low-pressure steam, having high economic value.

According to the carbon cycle ammonia production system and method based on chemical-looping water splitting, in the carbon cycle ammonia production system based on chemical-looping water splitting, a chemical-looping carbon cycle nitrogen-hydrogen cogeneration module combines a fuel reactor and a high-temperature solid carbon dioxide electrolytic cell in a chemical-looping process, and hydrogen-nitrogen cogeneration with zero carbon emission is achieved. According to the Harbin process ammonia preparation module, multi-stage compression and intermediate cooling are carried out on raw material gas, the system energy consumption is reduced, and moisture used for a steam reactor is preheated. Then, a multi-stage reactor is adopted in the ammonia production process, heat recovery and raw material recovery are implemented, and a chemical chain product is efficiently converted into ammonia gas. The concentrating solar thermoelectric steam co-production module adopts molten salt as a working medium and is combined with a reheat return Rankine cycle containing a heat regenerator to meet the heat and electricity requirements of the system. The system utilizes a chemical-looping water splitting technology to prepare high-purity ammonia gas under a zero-carbon condition, and has the advantages of high efficiency, low emission, high resource utilization and the like.

The invention belongs to the field of intelligent adsorption nitrogen making machines, and particularly relates to an intelligent self-adaptive pressure swing adsorption nitrogen making machine which is characterized in that two alternate nitrogen making pressure swing adsorption tank bodies are arranged between an air filtering system and a nitrogen storage tank in a communicating mode, and each pressure swing adsorption tank body is provided with a plurality of sieve plates capable of sliding to be close to each other; molecular sieve particles are filled in the pressure swing adsorption tank body among the plurality of sieve plates, a plurality of conical sleeves are arranged on the upper end surface of each sieve plate, a spiral transmission plate is rotatably arranged in each conical sleeve, and an annular inclined sieve plate is arranged on the excircle surface of the upper end of each conical sleeve; annular plates are arranged between the conical sleeves and the annular inclined sieve plates, and a plurality of feeding ports are formed in the outer circle face of the lower end of each conical sleeve. By arranging the conical sleeve and other components, the molecular sieve in the pressure swing adsorption tank can be stirred up and down, so that the desorption efficiency of the molecular sieve is improved, and meanwhile, dust generated by crushing in the molecular sieve can be separated.

The invention relates to the technical field of gas separation membrane materials, in particular to a preparation method of a PIL-MOF composite membrane and application of the PIL-MOF composite membrane in CO2 / N2 separation.The preparation method comprises the steps that S1, a PET base membrane is pretreated, specifically, the PET membrane is soaked in a 3M HNO3 solution for 8-12 hours, washed with deionized water to be neutral and then dried; s2, in-situ growth of UiO-66-NH2: dissolving zirconium tetrachloride in acetic acid, preserving heat at 80 DEG C for 0.5-1.5 hours, cooling, adding DMF and 2-aminoterephthalic acid to form a precursor solution, dipping the pretreated PET film for 1-3 hours, and performing solvothermal reaction at 110-130 DEG C for 18-24 hours to obtain a PET / UiO-66-NH2 film; and S3, photo-initiation polymerization: coating the surface of the PET / UiO-66-NH2 film with a solution containing [VBIM] [BF4], a cross-linking agent and a photoinitiator, carrying out 365 nm ultraviolet light curing for 0.5-2 h, and drying to obtain the PIL-MOF composite film. The composite membrane combines the porous characteristic of the metal organic framework and the functional characteristic of the ionic liquid, and has application value in the fields of gas separation, catalysis and the like; the preparation process is simple, the interface bonding strength is high, and the product performance is stable.

The utility model relates to the technical field of nitrogen making equipment, in particular to flow-controllable pressure swing adsorption nitrogen making equipment, which comprises an adsorption cylinder and a storage cylinder, a shell is fixedly communicated and connected between the adsorption cylinder and the storage cylinder, two extension plates are symmetrically distributed on the surface of the shell in the axial direction of the shell, and the two extension plates are arranged on the surface of the shell. Extension openings are symmetrically distributed in the surface of the shell in the direction perpendicular to the axis of the shell, the surface of each extension opening is fixedly connected with an interface flange, a movable wheel is movably arranged in the shell, a rotating shaft is fixedly connected to the center of the movable wheel, and a plurality of first sliding grooves are formed in the surface of the movable wheel in the circumferential direction. A movable plate is slidably connected into each first sliding groove, each movable plate is attached to the inner surface of the shell, the space between the movable wheel and the shell has a containing difference by changing the height of the circle center of the rotating shaft, the movable wheel is made to rotate, and therefore the gas volume at the inlet and outlet position is adjusted, and the flow is adjusted in a disguised mode.

The utility model discloses a system for efficiently preparing liquid nitrogen by using a two-stage membrane separation technology, and relates to the technical field of industrial purification and liquefied nitrogen. The membrane separation technology and the gas liquefaction technology are combined, so that nitrogen in air is purified, the residual pressure of medium-pressure gas is fully utilized to provide cold energy for high-concentration nitrogen liquefaction, and the residual potential energy of the high-concentration gas is utilized to improve the nitrogen generation efficiency. A compressor, a gas cooling module, a first-stage separator and a second-stage separator of the system are sequentially arranged in the flowing direction of air. A high-pressure outlet of the second-stage separator is communicated with a first hot end inlet of the first heat exchanger; a first outlet of the first heat exchanger is communicated with a hot end inlet of the second heat exchanger, a second hot end inlet is communicated with a side backpressure outlet of the first-stage separator, a second outlet is communicated with a cold end inlet of the second heat exchanger through an expansion machine, a third outlet is communicated with atmosphere, and the cold end inlet is communicated with a second outlet of the second heat exchanger; and a side backpressure outlet of the second-stage separator is communicated with the compressor.

The invention discloses a low-temperature low-pressure synthesis ammonia tower and a coupling fuel cell renewable energy flexible synthesis ammonia system, the synthesis ammonia tower comprises a reactor outer cylinder, a catalyst frame is sleeved in the reactor outer cylinder, a catalyst bed layer, a heat exchange tube bundle and a spiral baffle plate are arranged in the catalyst frame, the heat exchange tube bundle passes through the spiral baffle plate, and the spiral baffle plate passes through the reactor outer cylinder. The catalyst bed layer is arranged on the spiral baffle plate; raw material gas enters the catalyst frame and is subjected to ammonia synthesis reaction in the axial and radial directions of the catalyst frame under the action of the spiral baffle plates; high-pressure water in the heat exchange tube bundle absorbs reaction heat from the catalyst frame to generate phase change, and after high-pressure steam is generated, the high-pressure steam is discharged from the steam tube. The design of the spiral baffle plate in the synthesis ammonia tower can guide the raw material gas to form a more complex flow path in the catalyst frame, so that the gas can pass through the catalyst bed layer more uniformly, the contact efficiency of the gas and the catalyst is improved, the retention time of the gas in the catalyst bed layer is prolonged, and the service life of the gas is prolonged. Therefore, the conversion rate and the efficiency of the ammonia synthesis reaction can be improved.

The invention relates to the technical field of cryogenic nitrogen making machine control, in particular to a cryogenic nitrogen making machine cluster control method, system and device and a storage medium. The control method comprises the following steps: collecting air compressor outlet air real-time parameters of each cryogenic nitrogen making machine in a cluster, current state parameters of molecular sieve adsorbers and precooler operation parameters, and predicting regeneration requirements of each molecular sieve adsorber in a future preset time period. According to the method, the operation parameters of each unit in the cluster are collected, and the future regeneration demand is predicted based on the time sequence model, so that a time window is provided for dynamic adjustment of waste heat utilization; on the basis, the dynamic heat contribution value is calculated based on the outlet parameters of the air compressor, the opening degree of the branch valve is adjusted in advance according to the dynamic heat contribution value, time matching and quantity matching of waste heat supply and regeneration requirements are achieved, and heat supply and demand imbalance caused by adjustment delay is avoided.

The invention discloses a movable high-pressure membrane separation nitrogen-making device which comprises an air compressor component section, an air pretreatment component section and a nitrogen-making host component section, the air compressor component section, the air pretreatment component section and the nitrogen making main machine component section are all mounted on flat cars, and three-ring chains and connecting bolts are arranged at the tail parts of the flat cars and are used for connecting the flat cars; the nitrogen-making device has the following advantages: the nitrogen-making efficiency is high; the product process is advanced and low in cost; operation is stable, and the service life is long; the permanent magnet variable-frequency air compressor can automatically adjust the rotating speed of the motor according to the change of the demand of compressed air and provide real-time matched compressed air output when used in cooperation with the permanent magnet variable-frequency air compressor; due to the characteristic, the equipment can still operate efficiently under the working condition of large load change, and the energy consumption is greatly reduced.

The utility model belongs to the technical field of nitrogen separation, and particularly relates to a carbon-nitrogen separation pressurization reaction tank which comprises a pressurization tank body and an adjusting box, the pressurization tank body is connected with the adjusting box through a connecting plate, the outer wall of a rotating cylinder is fixedly connected with a plurality of carbon storage boxes, and the inner wall of the rotating cylinder is slidably connected with a sliding cylinder; the rotating cylinder, the carbon storage box and the sliding cylinder are all provided with communicating holes which are communicated with one another, and the inner wall of the adjusting box is slidably connected with an adjusting plate; a rotating cylinder and a carbon storage box can be driven by a first motor to rotate in a pressurizing tank body, the oxygen extraction speed of carbon is increased, sliding plates fixedly connected to adjusting plates can penetrate through receding holes, the two sides of the carbon storage box are closed while the pressurizing state in the pressurizing tank body is not affected, and when nitrogen is exhausted, the carbon storage box is not prone to being blocked, so that the carbon storage box is not prone to being blocked. After pressure reduction is generated in the pressurizing tank body, oxygen adsorbed on carbon is prevented from being desorbed and mixed into nitrogen again.

The invention relates to the technical field of plasma electric flame stoves, in particular to a system for supplying nitrogen through centralized air separation for an electric flame stove and a working method. The system comprises an air compression and pretreatment unit, a pressure swing adsorption separation unit, a nitrogen buffer pressure stabilization unit, a nitrogen distribution conveying pipe network, a user side regulation and control unit and at least one electric flame stove which are sequentially connected in the gas flow direction. According to the invention, through centralized nitrogen generation and pipeline distribution, the problem of large-flow nitrogen supply of dispersed users is solved, and the emission of nitrogen oxides is greatly reduced due to the use of oxygen-free nitrogen by the electric flame stove. According to the system, indoor oxygen supplementation of oxygen-enriched gas and domestic hot water recovery of compressed waste heat are achieved at the same time, and the comprehensive utilization efficiency of resources is improved; by adopting the carbon steel pipe net, the construction cost is reduced, and nitrogen with different purities can be flexibly produced to meet multiple requirements; and real-time matching of nitrogen supply and stove power is realized through intelligent flow control of a user side, and stable and efficient operation is guaranteed.

The invention discloses a pressure swing adsorption type tail gas recovery device for polypropylene production, and relates to the field of tail gas recovery, the pressure swing adsorption type tail gas recovery device comprises an adsorption pipe sleeve filtering adsorption bag, an adsorption cylinder is arranged in a treatment cylinder, a detection chamber is installed on the inner wall of the adsorption cylinder, a discharge valve is installed in the detection chamber, and an infrared spectrometer is arranged on the discharge valve; the tail gas recovery device comprises a treatment barrel, the treatment barrel is provided with a pressure swing adsorption assembly, an annular pipe is arranged on the outer wall of the treatment barrel, a plurality of air compression pipes are installed on the annular pipe, an air compressor is installed on the treatment barrel, and the air compressor is connected with the annular pipe. And the introduced mixed gas is mixed and stirred step by step, so that the mixed gas is in full contact with the adsorption block, the propylene in the mixed gas is absorbed, the pressure is adjusted again, the setting of liquefaction of the adsorbed propylene and gas-liquid separation is facilitated, and the liquefied propylene is separated from the mixed gas.

The utility model discloses an inert gas protection system for energy storage, which is characterized in that a nitrogen space pipeline with a pressure regulating valve is arranged in an energy storage box body, and the nitrogen space pipeline is provided with a space nitrogen nozzle through an electric valve. And the nitrogen space pipeline is connected with a nitrogen PACK nozzle through a nitrogen cluster-level pipeline. And a nitrogen exhaust port on the battery pack is connected to the backflow branch pipe through a nitrogen exhaust pipeline. The nitrogen output end of the nitrogen making pry is connected with a gas supply header pipe, the gas supply header pipe is connected with a gas supply branch pipe, and the gas inlet end of the nitrogen space pipeline is connected with the gas outlet end of the gas supply branch pipe. A gas inlet of the nitrogen making pry is connected with a backflow branch pipe through a backflow main pipe. A detector used for detecting fire in the box is further installed in the energy storage box body. Air is used for preparing nitrogen serving as inert gas for protection, nitrogen is circularly generated, the cost of a protection material is reduced, an anaerobic environment is achieved through the inert gas in active protection, new nitrogen is continuously circulated, the storage amount of combustion-supporting oxygen is greatly reduced, and the protection effect is better.

The embodiment of the utility model discloses a marine nitrogen generation system which comprises an air compression assembly, a nitrogen generation assembly, a nitrogen generation assembly and a nitrogen generation assembly, wherein the air compression assembly is used for receiving clean air and compressing the clean air; the air inlet end of the air pretreatment assembly is connected with the air outlet end of the air compression assembly, and the air pretreatment assembly is used for pretreating compressed air; the gas inlet end of the membrane separation main machine is connected with the gas outlet end of the air pretreatment assembly, and the membrane separation main machine is used for preparing nitrogen from the pretreated air to obtain nitrogen; the gas inlet end of the nitrogen pressurizing assembly is connected with the gas outlet end of the membrane separation main machine, and the nitrogen pressurizing assembly is used for pressurizing nitrogen; the gas supply module is used for supplying gas to the equipment to be supplied with gas; and the upper control machine is used for controlling each component and carrying out gas consumption regulation. And the intelligence of the nitrogen generation system is improved.

The purpose of the present invention is to provide a nitrogen gas purification device which enables the removal of impurity gases which are difficult to remove at ordinary temperature. This nitrogen gas purification device includes an adsorption part, an introduction path to the adsorption part, and a discharge path from the adsorption part. In the nitrogen gas purification device, impurity gases contained in nitrogen gas introduced into the adsorption part through the introduction path are adsorbed in the adsorption part and the thus-purified nitrogen gas is discharged from the adsorption part to the discharge path. The introduction path has a heat exchanger for cooling the nitrogen gas by heat exchange with liquefied nitrogen.

The utility model relates to a molecular sieve regeneration device for liquid nitrogen wash purified gas of a synthetic ammonia production device. In the device, a low-pressure nitrogen pipeline is connected with a molecular sieve adsorber, the bottom of the molecular sieve adsorber is connected with a nitrogen heater through a pipeline, and the nitrogen heater is connected to a phosphoric acid device hot blast stove through a fuel gas pipeline. The top of the molecular sieve adsorber is connected with the liquid nitrogen washing cold box. A track ball valve I is arranged on a connecting pipeline between the bottom of the molecular sieve adsorber and the nitrogen heater; and a regulating valve II is arranged on the nitrogen heater and the fuel gas pipeline. According to the utility model, high-concentration CO adsorbed by the molecular sieve is sent to the hot blast stove of the phosphoric acid device for combustion at the initial stage of the regeneration preheating stage of the liquid nitrogen wash molecular sieve, thereby improving the automatic control level of molecular sieve regeneration programs; the problem of fluctuation of a low first washing device during regeneration of the molecular sieve is effectively solved, the problem that a combustible poisonous gas detector gives an alarm due to direct emptying of high CO during regeneration is thoroughly solved, and part of energy is recycled.

The utility model discloses a preparation system of oxygen-deficient nitrogen, which comprises a buffer tank as an oxygen-deficient nitrogen tank; a gas inlet of the buffer tank is connected with a gas mixer, a high-purity nitrogen inlet pipe and a compressed air inlet pipe are respectively connected with a gas inlet of the gas mixer, and the two gases enter the oxygen-poor nitrogen tank after being mixed in the gas mixer. According to the oxygen-deficient nitrogen preparation system provided by the utility model, high-purity nitrogen and compressed air provided by a chemical industry park can be used as raw material gases, and the high-purity nitrogen and the compressed air respectively enter the gas mixer in proportion to be mixed and then enter the oxygen-deficient nitrogen tank, so that the oxygen-deficient nitrogen with required concentration is continuously provided for production.

In order to overcome the defects in the prior art, the invention provides a preparation method of a coprecipitation copper-manganese catalyst and a preparation method of ultrapure nitrogen, the preparation method of the coprecipitation copper-manganese catalyst comprises the following steps: mixing a copper metal salt solution, a manganese metal salt solution and an oxidizing agent, and adjusting the pH value to 7.5-11, the molar ratio of copper to manganese being (0.02-3): 1; carrying out ultrasonic aging on the coprecipitate for 20-40 minutes, and then aging for 10-14 hours; filtering and washing to obtain a filter cake; and drying the filter cake overnight at 95-125 DEG C, and calcining at 350-450 DEG C in a gas atmosphere for 3-5 hours to obtain the coprecipitation copper-manganese catalyst. The catalyst prepared by the preparation method of the coprecipitation copper-manganese catalyst provided by the invention has relatively good catalytic capability, can simultaneously catalyze and remove carbon monoxide and hydrogen at room temperature, maintains 100% H2 conversion rate for 4-8 hours, maintains high CO conversion rate for more than 50 hours, has very long effective action time, and is very suitable for industrial production. The long-period operation requirement of industrial production can be met.

The present disclosure provides system and method for synthesis of green ammonia and other nitrogenous fertilizers derived from it including urea and nitric acid (as well as others that may be produced by any combination / reaction of these) by coupling renewable energy and Carnot battery with Solid-Oxide Electrolyser Cell (SOEC) and Direct Air Capture (DAC). 5 The system provides a solution for round-the-clock renewable energy using Carnot battery that provides both heat and power to run SOEC. The heat from Carnot battery is used by DAC to capture carbon dioxide from air. A nitrogen-oxygen generator may produce nitrogen using continuous power from Carnot battery. Ammonia may be produced by using hydrogen from SOEC, and nitrogen from the nitrogen-oxygen generator. Urea may be produced using 0 carbon dioxide from DAC and ammonia. Ammonia and oxygen from SOECs and nitrogen- oxygen generator may be used for synthesis of nitric acid, and other nitrogenous fertilizers. The process heat from ammonia and nitric acid synthesis is recycled back to the Carnot battery.

The present invention provides a device system and method for coupling hydrogen production and ammonia synthesis. The device system includes a nitrogen supply unit, a hydrogen production unit, and an ammonia synthesis unit. The hydrogen production unit and the ammonia synthesis unit are interconnected, and the hydrogen production unit and the ammonia synthesis unit are respectively and independently connected to the nitrogen supply unit. The method includes introducing nitrogen into the hydrogen production process and the ammonia synthesis process respectively. The device system provided by the present invention deeply integrates the hydrogen production device and the ammonia synthesis device, solves the problems of hydrogen-oxygen intermixing and uneven temperature in the electrolytic cell, and improves the safety and stability of the whole system.

The application provides a two-dimensional RUB-18 zeolite membrane and a preparation method and application thereof in gas separation, and belongs to the technical field of two-dimensional nanosheet membrane preparation and gas separation, and the preparation method of the two-dimensional RUB-18 zeolite membrane comprises the following steps: ball-milling stripping to obtain a two-dimensional RUB-18 zeolite nanosheet solution; and placing a porous substrate into the two-dimensional RUB-18 zeolite nanosheet solution to perform electrophoretic deposition. The application provides a mild method for preparing two-dimensional RUB-18 zeolite nanosheets by ball-milling stripping, and the two-dimensional RUB-18 zeolite membrane is prepared from the two-dimensional RUB-18 zeolite nanosheets, which is simple, efficient, low in cost, and a two-dimensional RUB-18 zeolite membrane with a thickness of 200-800 nm can be grown on the porous substrate in 5-50 minutes, and the two-dimensional RUB-18 zeolite membrane can be successfully used for gas separation, and the permeability and selectivity can be considered.

This invention provides a nitrogen generator, comprising a gas pump, an annular buffer chamber, a first pipeline, and a second pipeline. The gas pump's outlet pipe is connected to both the first and second pipelines, which are in turn connected to the annular buffer chamber. The gas pump draws in air through the inlet pipe and discharges it into the first and second pipelines in the form of airflow. The first pipeline discharges airflow with a pressure greater than a preset airflow pressure into the annular buffer chamber. The second pipeline discharges airflow with a pressure less than a preset airflow pressure into the annular buffer chamber. The annular buffer chamber uniformly mixes the airflow with the pressure greater than the preset airflow pressure with the airflow with the pressure less than the preset airflow pressure. This invention reduces airflow pressure fluctuations, pipeline vibration, and airflow noise by uniformly mixing airflows with different pressures flowing through the first and second pipelines within the annular buffer chamber.