309results about "Nitrogen purification/separation" patented technology

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 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 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 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.

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.

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.

The application provides a hydraulic pressure compacting adsorption tower structure with a detection feedback function, and mainly relates to the technical field of pressure swing adsorption equipment. The hydraulic pressure compacting adsorption tower structure with the detection feedback function comprises an adsorption tower cylinder, an upper cover and a hydraulic pressure compacting module. The upper cover is detachably fixed at the top end of the adsorption tower cylinder through a bolt assembly. The adsorption tower cylinder is filled with granular molecular sieve. A sieve plate, a stainless steel wire mesh pad and a pressing plate are sequentially stacked in the axial direction above the molecular sieve. The detection end of an electric contact pressure gauge is in communication with the piston cavity of the hydraulic pressure compacting module, and the signal output end thereof can be externally connected to a PLC control system to realize pressure alarm and compacting state feedback. The structure is widely applied. The hydraulic pressure compacting module has the advantages of manual compacting, low cost, high reliability, large compacting force, good stability, adjustable design of the compacting rod length, oil leakage prevention, double anti-reverse prevention and the like. Moreover, the compacting state can be monitored and fed back in real time, and the invalidation of the molecular sieve can be effectively avoided.

The invention relates to a pressure swing adsorption type nitrogen generator and a preparation method, and relates to the technical field of nitrogen preparation, the pressure swing adsorption type nitrogen generator comprises a nitrogen preparation device, the nitrogen preparation device comprises a first adsorption tower and a second adsorption tower which are designed to alternately prepare nitrogen, and gas outlets of the first adsorption tower and the second adsorption tower communicate with each other through a connecting pipeline; the middle part of one side of the connecting pipeline is communicated with a gas outlet pipeline communicated with the nitrogen storage tank, so that two lagging sections are formed between the gas outlet pipeline and the two gas outlets and are used for intercepting nitrogen containing residual oxygen, and the gas outlets of the first adsorption tower and the second adsorption tower are provided with oxygen detection pieces; a reverse pressurizing pipeline communicated with the reverse pressurizing pipeline is arranged between the carbon molecular sieve filling block and the gas outlet pipeline on the other side of the lagging section, and through the reverse pressurizing pipeline, the preparation purity of nitrogen can be improved, the pressure difference can be increased, the desorption rate of the adsorption tower can be increased, and the purity of nitrogen prepared in the next process can be improved.

The invention discloses a new energy off-grid green, hydrogen and ammonia production integrated system coupled with liquid-air energy storage and power generation, and relates to the technical field of new energy comprehensive utilization and chemical production. A wind-light-electricity new energy power generation module converts wind energy and solar energy into electric energy, and a liquid air energy storage module stores energy through air compression-liquefaction-expansion; the hydrogen production module utilizes electric energy to electrolyze water to produce hydrogen, the air separation module produces nitrogen and supplies the nitrogen to the ammonia production module, and the ammonia production module reacts hydrogen and nitrogen to synthesize green ammonia. The problems of intermittency and instability of new energy power generation are effectively solved, integrated production of green hydrogen and green ammonia under the off-grid condition is achieved, dependence on traditional energy and external infrastructures is reduced, the production cost and carbon emission are reduced, and the energy utilization efficiency is improved; meanwhile, the circulating system of the ammonia production module improves the utilization rate of raw materials and improves the economic benefits of the system.

Processes and apparatuses for treating NOx from a carbon dioxide stream. Prior to separating carbon dioxide and NOx, NOx is converted to nitrogen gas in an NOx conversion zone, which may include an SCR reactor and / or CO boiler. A carbon separation zone which may include one or more fractionation columns produces a CO2 stream and an NOx stream. The NOx is passed back to the NOx conversion zone.

The invention relates to the technical field of nitrogen making machines, in particular to a nitrogen making machine convenient to maintain and use in a low-temperature environment and a using method of the nitrogen making machine. The heating assembly comprises a heat source, a partition plate, a connecting pipe, a waste heat recovery pipe and an exhaust pipe, hot air generated by the heat source can be preferentially blown to the double-tower nitrogen-making equipment, then the hot air enters the maintaining cavity through the hot air flow channel to conduct auxiliary heating on other equipment in the nitrogen-making assembly, and finally the hot air cooled in the maintaining cavity enters the waste heat recovery pipe through the connecting pipe to conduct auxiliary heating on the other equipment in the nitrogen-making assembly. The interior of the waste heat recovery pipe is hollow, the waste heat recovery pipe preheats air in the air inlet pipe in a convective heat exchange mode, and low-temperature air obtained after heat exchange is completed is exhausted out of the box body through the exhaust pipe.

The invention discloses a device and a process for refining and purifying nitrogen, and relates to the technical field of nitrogen purification, and the process comprises the following steps: step 1, desulfurization pretreatment: feeding a raw material common nitrogen from a nitrogen inlet, and removing sulfides such as H2S and SO2 through a desulfurization tower; step 2, TSA deep decarburization: the desulfurized nitrogen enters a decarburization tower A or a decarburization tower B which is working, and CO2, CO and hydrocarbon are deeply removed; and 3, purity monitoring and output: detecting the purified nitrogen through an analyzer to generate qualified high-purity nitrogen, outputting the qualified high-purity nitrogen, and automatically emptying the qualified high-purity nitrogen if the qualified high-purity nitrogen is not qualified. By inheriting a double-tower composite process of normal-temperature desulfurization and temperature swing adsorption and introducing online monitoring and automatic control, deep, continuous and stable removal of various impurities such as carbon monoxide, carbon dioxide and sulfide in nitrogen is realized, and the problems that an existing purification device is single in function, cannot deeply remove various harmful impurities and is low in purification efficiency are solved. And a continuous operation and real-time quality assurance mechanism is lacked.

The utility model relates to the technical field of nitrogen filters, in particular to a filter for nitrogen purification, which comprises a tank body, a tank cover for blocking is assembled on the surface of the top end of the tank body through bolts, and electromagnetic valves for controlling opening and closing are assembled at the gas inlet end of the top of the tank cover and the gas outlet end of the periphery of the tank body; when the filter element body in one vertical hole needs to be replaced, the stop valve between the vertical hole and the flow dividing pipe can operate and block the channel at the position, then the vertical hole is in a closed state due to the check valve at the communicating position of the vertical hole and the tank body, and then the filter element body can be replaced only by rotating the surface of the tank cover to block the disc cover of the vertical hole at the position. The disc cover is more convenient to disassemble through the ring seat at the top of the disc cover, then the barrel seat screwed in the vertical hole can be disassembled, the filter element body in the barrel seat can be replaced, reverse operation is convenient to install, meanwhile, the filter element body at the position can be continuously used only by removing blocking of the stop valve, and nitrogen can be conveniently filtered.

The utility model provides a portable modularized nitrogen making machine. The portable modularized nitrogen making machine comprises a gas inlet seat and a gas outlet seat, wherein the gas inlet seat and the gas outlet seat are respectively provided with a gas inlet channel and a gas outlet channel; the air inlet end and the air outlet end of the adsorption module are respectively communicated with the air outlet end of the air inlet channel and the air inlet end of the air outlet channel; the first connecting piece is detachably arranged at the air inlet end of the air inlet channel in a sealing manner; the second connecting piece is detachably arranged at the air outlet end of the air outlet channel in a sealed mode. Pipeline connection among a compressed air pipeline, an air inlet channel and an air inlet control valve is achieved through a first input channel, a first output channel and a first control cavity which are integrally integrated in a first connecting piece. And the second input channel, the second output channel and the second control cavity which are integrally integrated in the second connecting piece realize pipeline connection among the nitrogen pipeline, the gas outlet channel and the gas outlet control valve, so that the number of pipe fittings required by the nitrogen making machine is greatly reduced, rapid installation of the gas pipeline of the nitrogen making machine is realized, the production efficiency is improved, and the production cost is reduced. And connection points of gas pipelines can be reduced, and the gas leakage risk is reduced.

The invention provides a control method and device of a nitrogen making machine and the nitrogen making machine, and relates to the technical field of nitrogen making machines, and the control method of the nitrogen making machine comprises the steps that air is introduced into an air compressor to generate first compressed air; moisture, oil and particles in the first compressed air are removed, and purified air is generated and guided into an air storage tank; the adsorption separation equipment is controlled to adjust the valve opening degree according to the air pressure of purified air, and first nitrogen is separated out; controlling the adsorption separation equipment to close a valve, and analyzing the nitrogen element content of the first nitrogen; guiding the first nitrogen to separate out qualified nitrogen or unqualified nitrogen, guiding the qualified nitrogen into a nitrogen storage tank, and guiding the unqualified nitrogen back to the adsorption tower for adsorption again; the qualified nitrogen is stored and subjected to pressure regulation, and second nitrogen is obtained; and controlling the second nitrogen to be cleaned and filtered through the dust filter, and releasing the second nitrogen. According to the invention, rapid starting can be realized, purity stability is improved, gas waste is reduced, and system energy consumption is reduced.

The invention discloses a preparation method and application of a Ni-NH2-MOF-coated HPP-COF composite material for adsorbing and separating perfluorocarbon gas / nitrogen, and belongs to the field of gas separation. The method comprises the following steps: 1, preparing HPP-COF powder; 2, preparing Ni-NH2-MOF (Metal Organic Framework) powder; and 3, compounding. According to the invention, Ni-NH2-MOF and HPP-COF are introduced into the field of gas adsorption, and a method for combining COF and MOF materials is creatively provided by utilizing the interaction of specific recognition of a perfluorinated compound and an amino group and a polymerization reinforcing structure on the surface of HPP-COF; a PFCs / N2 mixed gas separator meeting actual production requirements is prepared, the high adsorption capacity of MOF and the high stability of COF are combined, the problems that a traditional static porous material is poor in selectivity, stability and acid resistance are solved, specific adsorption of MOF to PFCs is enhanced, and selectivity is improved.

The invention provides a carbon molecular sieve gas separation membrane prepared based on Joule heating and a preparation method and application thereof. According to the preparation method, 6FDA-DAM polyimide is used as a precursor material, an aprotic polar solvent is used as a solvent, a compact precursor film is prepared through a solvent evaporation method, and carbonization treatment is carried out in a vacuum environment in a Joule heating mode. By controlling the carbonization duration, the microporous structure in the membrane, the formation of an ordered carbon skeleton and the removal degree of functional groups can be adjusted, the conversion from surface diffusion to a molecular sieve screening mechanism is realized, and the gas separation capacity is remarkably improved.

This utility model provides a nitrogen purification and drying structure, including: a nitrogen purification and drying cylinder, a filter drying element disposed inside the nitrogen purification and drying cylinder, a maintenance sealing plug disposed at the upper end of the nitrogen purification and drying cylinder, the nitrogen purification and drying cylinder including a drying filter barrel, a nitrogen discharge pipe disposed on one side of the drying filter barrel, a filter drying element including a nitrogen purification and drying filter barrel installed inside the drying filter barrel, the nitrogen purification and drying filter barrel being mounted on a filter barrel mounting base, a nitrogen input pipe disposed inside the nitrogen purification and drying filter barrel, and an input pipe connecting flange disposed on the nitrogen input pipe. This utility model adopts a modular design, which not only reduces the cost of use, but also makes installation and maintenance very convenient.

This invention discloses a low-pressure nitrogen interconnection system and its usage method, comprising a 35,000 kW oxygen generator unit, a water-cooled tower, a 12,000 kW nitrogen compressor, a 6,000 kW nitrogen compressor, a 7,200 kW nitrogen compressor, a 6,000 kW oxygen generator unit A, and a 6,000 kW oxygen generator unit B. The outlet of the 35,000 kW oxygen generator unit is connected via pipelines to the inlets of the 35,000 kW nitrogen compressor A, the 35,000 kW nitrogen compressor B, a flow valve, and a main connecting valve. The outlet of the flow valve is connected via a pipeline to the inlet of the water-cooled tower, and the outlet of the water-cooled tower is discharged to the atmosphere via a pipeline. This invention optimizes the structure of the low-pressure nitrogen interconnection system, fully utilizes the surplus nitrogen produced by the oxygen generator, avoids resource waste, improves economic efficiency, and increases the output of low-pressure nitrogen with the same power consumption, saving electricity consumption, reducing production costs, achieving the goal of energy saving and efficiency improvement, and meeting the gas demand of the nitrogen pipeline network.

The application discloses a kind of recovery device for nitrogen making machine, it is related to nitrogen making machine technical field, including processing table, the top of the processing table is fixedly installed with nitrogen making mechanism, the surface of nitrogen making mechanism is fixedly penetrated with inlet pipe, the surface of inlet pipe is fixedly installed with fixed pipe, the top of fixed pipe is rotatably penetrated with inlet valve, the surface of fixed pipe is fixedly installed with round pipe, knock plate is rotatably installed on the inner wall of round pipe, the surface of knock plate is fixedly installed with elastic sheet, the inner wall of round pipe is fixedly installed with clamping plate, the inner and outer walls of round pipe are rotatably penetrated with baffle, by triggering the rotation of baffle, avoid the situation of leakage when inlet pipe continues to discharge oxygen-rich waste gas, realize the effective management of oxygen-rich waste gas leakage, effectively reduce the waste of resources when leakage occurs.

The invention belongs to the technical field of adsorption type nitrogen generation, particularly relates to PSA (Pressure Swing Adsorption) type nitrogen generation equipment and a method thereof, and aims to solve the problems that in the prior art, a single filter cavity structure is mostly adopted, when a filter screen is blocked by impurities and needs to be replaced or cleaned, shutdown operation must be performed, and the continuous gas generation capacity of the equipment is seriously influenced; in order to solve the problems that in the prior art, due to the fact that air enters a filter cavity in a directional and concentrated mode, airflow easily washes the local area of a filter screen, the local area of the filter screen is blocked rapidly, and the overall utilization rate and the service life of the filter screen are reduced, the following scheme is provided that the device comprises a base, and supporting legs are fixedly installed at the four corners of the bottom of the base; a filter box, a nitrogen-making adsorption separation tank and a nitrogen-making storage tank are fixedly mounted at the top of the base. According to the invention, online non-stop switching of a filter cavity is realized; the integral utilization rate of the filter screen is improved by utilizing a uniform ventilation mechanism for reciprocating swinging of the splitter plate; the structure is simple, and the equipment failure rate and the maintenance cost are greatly reduced.

The utility model relates to the field of fire prevention and suppression devices suitable for road vehicle battery packs, in particular to a molecular sieve nitrogen generation device, a nitrogen protection system, a power battery system and a vehicle. The molecular sieve nitrogen making device comprises a box body, a separation tower is fixedly installed in the box body, a compressed gas inlet and a nitrogen exhaust port are formed in a tank body of the separation tower, the compressed gas inlet is connected with a compressed gas pipeline, the nitrogen exhaust port is connected with a nitrogen pipeline, and the tank body is further connected with an oxygen-enriched gas exhaust pipeline. The other end of the compressed gas pipeline, the other end of the nitrogen pipeline and the other end of the oxygen-enriched gas discharging pipeline are communicated with the outside of the box body, valves are arranged on the compressed gas pipeline, the nitrogen pipeline and the oxygen-enriched gas discharging pipeline respectively to control on-off of the compressed gas pipeline, the nitrogen pipeline and the oxygen-enriched gas discharging pipeline, and at least part of the valves are installed on the box body through corresponding supports. And pipeline arrangement spaces for arranging pipelines are respectively formed above and below the bracket. Through reasonable layout, the size of the molecular sieve nitrogen making device is reduced.

In a process for producing ammonia synthesis gas by electrolysis, comprising feeding a mixture of steam and compressed air into a first of a series of electrolysis units and passing it together with air through an outlet of one electrolysis unit to an inlet of the next electrolysis unit, the electrolysis units operating in an endothermic mode, and providing a nitrogen portion of the syngas by combusting hydrogen produced by steam electrolysis with air within or between the electrolysis units. The electrolysis unit is preferably a solid oxide electrolytic cell (SOEC) stack.

The invention relates to the technical field of nitrogen preparation, in particular to a nitrogen making device. The nitrogen making device comprises a bracket and a plurality of functional modules mounted on the bracket, wherein the plurality of functional modules at least comprise a damping module, a fireproof module and a sealing module; wherein the damping module is used for placing a component generating vibration, the fireproof module is used for placing an electrical component, and the sealing module is used for placing a nitrogen generation component. According to the nitrogen-making device provided by the invention, a part for generating vibration, an electrical part and a nitrogen-making part are divided into independent modules, so that the later maintenance operation is facilitated, the risk that other parts are easy to damage in the maintenance process is reduced, and the safety performance is improved.

The invention discloses a green ammonia synthesis system based on calcium-based thermochemical energy storage and high-temperature electrolysis coupling. Comprising a renewable energy power generation system, a heat exchange working medium pump, a thermochemical energy storage unit, an air separator, a high-temperature electrolytic hydrogen production unit, a nitrogen storage tank, a hydrogen storage tank, a first steam storage tank, a third steam storage tank, an ammonia synthesis unit, a second heat exchanger, a second steam storage tank, a first heat exchanger and a water feeding pump, the system can effectively solve the problem of intermittency of renewable energy sources, and is low in cost and high in flexibility.

The invention provides an MOF (Metal Organic Framework) separation material with a synergistic effect of electrostatic potential and pore confinement as well as a preparation method and application of the MOF separation material in carbon capture, and belongs to the technical field of composite material preparation and carbon capture. According to the preparation method, a pillar ligand in a Ni-Pyra MOF material is replaced by pillar ligands carrying different quantities of-CH3 through a ligand replacement method, so that the MOF separation material is prepared; in addition, three kinds of materials, namely, Ni-Pyra, Ni-DMPyra and Ni-TMPyra, are prepared. The MOF separation material has electrostatic potential and pore confinement action sites, the static adsorption capacity of the MOF separation material to CO2 is 55 cm < 3 > / g, the MOF separation material has good separation performance to CO2 / N2, and the MOF separation material has good practicability.

The invention provides an energy-saving membrane separation type nitrogen-making system. The energy-saving membrane separation type nitrogen-making system comprises an air compressor, a membrane separation type nitrogen-making device and a membrane separation type nitrogen-making device, the freezing dryer is connected with the air compressor; the heat exchanger is connected with the freezing dryer; the nitrogen storage tank is connected with the heat exchanger, and the nitrogen storage tank is provided with a nitrogen outlet; two ends of the nitrogen separation membrane are respectively connected with two sides of the heat exchanger; one end of the oxygen-enriched gas path is connected with the nitrogen separation membrane; the first end of a first bypass gas path is connected to the oxygen-enriched gas path, and the second end of the first bypass gas path is connected between the heat exchanger and the nitrogen storage tank; the third end of the second bypass gas path is connected to the oxygen-enriched gas path, and the fourth end of the second bypass gas path is connected between the second end and the nitrogen storage tank. Energy utilization is further effectively achieved through the heat exchanger and the like, and the technical problem that in the prior art, a membrane separation type nitrogen making system low in overall energy consumption is lacked is solved.

The present invention provides a nitrogen gas generator capable of stably, continuously, and reliably producing high-purity nitrogen gas using a combustion catalyst. [Solution] This nitrogen gas generator includes an oxygen output limiting means that takes in air or a gas containing nitrogen and oxygen, and outputs the air or the gas while limiting the amount of oxygen output from the air or the gas, and a catalytic combustion means that reacts the output air or the gas and the intake hydrogen-containing fuel gas on a combustion catalyst to convert the air or the gas into a nitrogen-enhanced gas with a higher nitrogen concentration. Here, the oxygen output limiting means sets the oxygen concentration of the air or the gas to be less than or equal to the maximum oxygen concentration determined based on a set or desired upper limit temperature in the combustion catalyst or catalytic combustion reaction, and / or sets the flow rate of the air or the gas to be less than or equal to the maximum flow rate determined based on a set or desired upper limit temperature in the combustion catalyst or catalytic combustion reaction.

The invention relates to a method and a device for producing nitrogen in an oil-gas well, which are characterized in that air is compressed and filtered and then enters a primary deoxidation unit for treatment to obtain low-purity nitrogen with oxygen content not higher than 2%, and the low-purity nitrogen is divided into two paths for split-flow treatment: after the first path of gas flow is mixed with raw material gas, the mixed gas is conveyed to a secondary deoxidation unit for treatment; after being heated, the second path of gas flow serves as purging gas of a catalyst bed layer after the reaction of the second-stage deoxidation unit, and purging tail gas is mixed with the first path of gas flow and the raw material gas and enters the second-stage deoxidation unit to be treated; the second-stage deoxidation unit takes a catalytic oxidation reactor as a main body, and oxygen and feed gas are fully reacted in the presence of a catalyst; and after the heat of the exhaust gas is recovered, the oil-gas well nitrogen is obtained. According to the method and the device, efficient deoxidation can be achieved, the oil-gas well nitrogen with the oxygen content lower than 0.01% is prepared, the problem of catalyst bed deposition carbon under the low-oxygen condition can be avoided, and long-term safe and stable operation of the device is maintained.

The utility model discloses a nitrogen drying device for nitrogen preparation, and relates to the technical field of nitrogen drying devices. The device comprises a base, a freezing dryer and a drying machine are symmetrically arranged on the upper surface of the base, a connecting pipe is arranged between the freezing dryer and the drying machine, a drying plate is arranged in the drying machine, an air outlet pipe is arranged on the outer side surface of the drying machine, and a flange plate is fixedly arranged at the other end of the air outlet pipe. When the adsorption plate needs to be replaced, the movable rod can be pulled to enable the end portion of the movable rod to be separated from the interior of the connecting cylinder, then the fixing plate can be moved through the pull opening to enable the adsorption plate to be separated from the interior of the drying machine, the connecting plate with a new adsorption plate can be inserted into the fixing frame plate, and therefore the adsorption plate can be replaced. The connecting cylinder is inserted into the inserting opening, then the movable rod can be loosened, the end of the movable rod can be inserted into the connecting cylinder through the force of the spring, the adsorption plate can be replaced conveniently, and the adsorption efficiency can be improved.