4712 results about "Gas separation" patented technology

To provide a technique that can suppress lowering of a rate of collection of adsorbed gas, even under a situation where quantities and densities of mixed gas flowing into an adsorption tower vary.SOLUTION: An adsorption tower control apparatus, which collects specific adsorbed gas using a plurality of adsorption towers, is provided with: a control part that causes an adsorption / desorption step, in which an adsorption step is executed in an adsorption-step tower and at the same time a desorption step is executed in a desorption-step tower, to be repeatedly executed in a plurality of adsorption towers while being transferred; an information obtaining part that obtains information on a property of mixed gas and an operational condition for the adsorption-step tower; and a desorption condition determining part that determines a desorption condition in the desorption-step tower from the information on the property of mixed gas and the operation condition. The control part causes the desorption step to be executed under the desorption condition determined by the desorption condition determining part, and when integrated quantity of adsorbed gas in the adsorption-step tower reaches a predetermined integrated quantity threshold, causes the adsorption-step tower and the desorption-step tower to transfer.SELECTED DRAWING: Figure 1

Disclosed herein are methods and systems for producing a liquefied methane product from a methane- and carbon dioxide-containing feed stream, in which a plurality of membrane stages comprising gas separation membranes that are more permeable to carbon dioxide than methane are used to remove carbon dioxide from the feed and form a retentate stream that is enriched in methane, said retentate stream being then cooled and liquefied to provide the liquefied methane product. In particular, the disclosed methods and systems may be used for producing liquefied biomethane from a biogas feed.

An integrated carbon honeycomb structure material and its preparation method are disclosed, belonging to the field of carbon materials technology. Based on a co-sacrificial template low-temperature pyrolysis strategy, the target material can be obtained through three main steps: preparation of a metal salt-colloidal microsphere template precursor, precursor pressing and molding, and subsequent calcination and carbonization. This technology has the characteristics and advantages of simple preparation process, regular and controllable macroscopic structure of the sample (such as shape, area, and thickness), rich and tunable chemical composition, and three-dimensional interconnection of graphene carbon matrix. It has great application potential in many fields such as electrochemical energy storage, catalysis, gas separation, adsorption, and electromagnetic shielding.

The invention relates to a method for operating an electrolysis plant (100) in which water is converted into oxygen and hydrogen in an electrolysis unit (110), wherein a processed fluid stream (c) is fed from an oxygen side (114) of the electrolysis unit to a gas separator (120), wherein the processed fluid stream (c) comprises water and gas, wherein an oxygen-containing fluid stream (g, h) is discharged from the gas separator (120), wherein the oxygen-containing fluid stream comprises gas, wherein the oxygen-containing fluid stream (h, d) is fed to an oxygen section of the electrolysis plant (100), and wherein, if required, ambient air (k) is supplied to the oxygen-containing fluid stream (h) at a feed point (140) before it is fed to the oxygen section of the electrolysis plant (100), or the oxygen-containing fluid stream (h) is supplied to the oxygen section of the electrolysis plant (100) before it is fed to the oxygen section of the electrolysis plant (100). is replaced by ambient air (k).The invention also relates to a corresponding electrolysis system (100).

The invention discloses an efficient variable-frequency low-temperature compressor system and a compression method thereof. The method comprises the steps that the actual oil-gas separation efficiency is obtained; inputting the working condition parameters of the compressor into a preset neural network prediction model to obtain an oil-gas separation efficiency prediction value and a theoretical solubility reference value; according to the actual oil-gas separation efficiency, the oil-gas separation efficiency predicted value and the theoretical solubility reference value, working condition deviation data is calculated, the comprehensive performance of the compressor at different frequency points is evaluated and calculated through an optimization algorithm, and a frequency adjustment curve is generated; according to the frequency adjusting curve, the operation frequency of the compressor is divided into a plurality of adjusting intervals, the operation frequency is adjusted in a stepped mode according to the adjusting intervals, the temperature and vibration parameters of the bearing are monitored in the adjusting process, and frequency adjusting feedback data are obtained; and according to the frequency adjustment feedback data, oil-gas separation efficiency deviation is periodically calculated, and compensation adjustment is conducted on the frequency adjustment curve. According to the technical scheme, insufficient lubrication and energy efficiency reduction of the compressor can be avoided.

The invention provides a preparation method of an hourglass type covalent organic framework (COF) composite membrane, and belongs to the field of gas membrane separation. According to the method, covalent organic framework nanosheets with different pore diameters and charge characteristics are utilized to construct the COF composite membrane with a unique hourglass structure through a vacuum-assisted layer-by-layer assembly technology, so that precise regulation and control on H2 and CO2 gas transmission behaviors are realized, and the prepared composite membrane shows remarkable H2 / CO2 separation selectivity and high permeation flux, and has a good application prospect. The chemical stability, the thermal stability and the mechanical flexibility are excellent. The invention provides a novel solution for efficient gas separation and energy storage application.

The oil-gas separation assembly comprises a separation shell, a closure baffle and an exhaust pipe, the separation shell comprises an oil discharge outlet and an air inlet, an included angle is formed between the air inlet and a first air outlet, a second air outlet is formed in the first end of the exhaust pipe, and the separation shell is provided with the oil discharge outlet; the cut-off baffle is sleeved on the exhaust pipe; on the horizontal projection, the second end of the exhaust pipe at least covers the end, close to the second air outlet, of the air inlet, and the end, close to the air inlet, of the closure baffle is located between the second air outlet and the air inlet. The oil-gas separation assembly can simply and efficiently achieve separation of oil and gas, the oil discharge rate of the compressor is reduced, loss of refrigeration oil of the compressor is avoided, and the reliability of the compressor is improved. The oil-gas separation assembly is simple in overall structure, convenient to assemble and low in cost, and the problem that the oil discharge rate of an existing scroll compressor is continuously increased can be solved under the condition that the manufacturing cost is not additionally increased.

Disclosed herein are membrane-based gas separation methods and systems. The methods and systems may, in particular, be used for separating a feed stream comprising methane and carbon dioxide (such as for example a biogas feed stream) in order to provide a methane product stream (such as for example a biomethane stream).

The invention discloses a chemical packed tower separation device, which belongs to the technical field of gas separation, and comprises a packed tower main body, and a liquid distribution mechanism is arranged in the packed tower main body close to the top. The bottom of one side of the outer wall of the packed tower main body is fixedly connected with a gas inlet pipeline communicated with the packed tower main body, a vertically arranged transmission mechanism is mounted in the packed tower main body, and a rotation driving mechanism for driving the transmission mechanism to rotate is fixedly mounted at the bottom of the inner wall of the packed tower main body; two groups of grating brackets are fixedly mounted on the inner wall of the packed tower main body, and two groups of gas-liquid exchange mechanisms for placing Pall ring bulk packing are also fixedly mounted on the transmission mechanism. By designing the rotation driving mechanism, the transmission mechanism and the gas-liquid exchange mechanism, in the rotation process of the gas-liquid exchange mechanism, more sufficient reverse contact of gas and liquid phases can be achieved, and the overall contact mass transfer effect is further improved.

The invention belongs to the technical field of gas separation membranes, and discloses a novel Cardo-based polyimide carbon molecular sieve membrane for CO2 / CH4 separation and a preparation method thereof.The carbon molecular sieve membrane is prepared in an improved carbonization mode, a synthesized carbon molecular sieve membrane precursor is a polyimide membrane with-CF3 and fluorenyl, and the carbon molecular sieve membrane precursor is a polyimide membrane with-CF3 and fluorenyl. And meanwhile, a diamine monomer with high steric hindrance is introduced for copolymerization, so that the pore distribution and gas separation performance of the carbonized carbon molecular sieve membrane are improved. The preparation method comprises the following steps: firstly, preparing a flat sheet membrane with a smooth surface from various prepared polyimides in a solvent evaporation manner, and then carbonizing a polymer membrane with high free volume and high rigidity in an improved carbonization manner, so that the polymer membrane has micropore-ultramicropore pore channel distribution and excellent gas separation performance; the method has a good industrial prospect in the field of CO2 / CH4 separation.

A disk-pack turbine for use, for example, in systems and methods in at least one embodiment for separating fluids including liquids and gases into subcomponents by passing the fluid through a vortex chamber into an expansion chamber and then through at least a portion of a waveform pattern present between at least two rotors and / or disks. The rotors and / or disks having waveform patterns on at least one side. In at least one embodiment, the waveform patterns include a plurality of hyperbolic waveforms axially aligned around a horizontal center of the system.

The invention relates to the technical field of fuel cells, in particular to a hydrogen cell water-gas separation device for an unmanned aerial vehicle, which comprises a separation shell, and a cyclone separation cavity, a heat exchange condensation cavity and a hydrogen mixing cavity which are sequentially distributed from bottom to top are arranged in the separation shell. The technical problem that a traditional gas-liquid separator cannot thoroughly remove micron-sized liquid drops is solved, liquid water drops are efficiently removed through the cyclone separation cavity, new hydrogen and wet hydrogen are subjected to heat exchange through the heat exchange condensation cavity, residual liquid drops are sufficiently condensed and separated out, and finally mixed hydrogen with the dryness meeting the requirement is output. And the anode flooding problem of the fuel cell is effectively avoided.

The present application provides a domestic sludge self-sustaining incineration process, comprising primary drying, secondary drying, crushing, and incineration, comprising: performing primary drying on domestic sludge by using dry hot air to obtain sludge having a moisture content of 40% to 55%; then performing secondary drying by using hot flue gas produced during incineration to obtain sludge having a moisture content not higher than 20%; further crushing the sludge and mixing the crushed sludge with hot flue ash produced during incineration, and feeding the mixture into an incinerator to undergo self-sustaining incineration at 850°C to 950°C; and performing solid-gas separation on high-temperature flue gas produced after combustion, wherein the obtained hot flue gas is returned back for secondary drying and the obtained hot flue ash is mixed with the crushed sludge. The present application further provides a device for the treatment process. According to the treatment process of the present application, self-sustaining combustion can be safely and stably completed after drying pretreatment is performed on domestic sludge having a high moisture content; no auxiliary fuel needs to be added during incineration, and heat energy of the system can be fully utilized; reduction treatment of domestic sludge can be achieved.

The invention relates to an oily sewage treatment device based on cooperation of rotational flow, air floatation and coalescence, belongs to the technical field of oily sewage treatment, and solves the problem that a current treatment device cannot realize oil-gas separation, the oily sewage treatment device comprises: a tank body, the bottom of which is provided with a drain pipe and the top of which is provided with an exhaust pipe; the conical inner cylinder is fixed in the tank body, a plurality of water distribution pipes are arranged at the bottom of the inner space of the conical inner cylinder, the liquid outlet ends of the water distribution pipes are arranged in the tangential direction of the conical inner cylinder, the water distribution pipes are connected with the water inlet mechanism, and a coalescence plate is arranged between the conical inner cylinder and the tank body; the oil-gas separation mechanism is fixed in the tank body and located above the conical inner barrel and comprises an oil collecting cover, the oil collecting cover is of an arc-shaped structure protruding upwards, an outlet is formed in the center of the oil collecting cover, a baffle is arranged above the outlet, the top of a collecting area above the oil collecting cover is communicated with an exhaust pipe arranged at the top of the tank body, and the bottom of the collecting area above the oil collecting cover is communicated with an oil discharging pipe arranged on the side portion of the tank body; the sewage treatment device provided by the invention meets the requirement of oil-gas separation.

The invention relates to a time-sharing measurement device for carbon content in flue fly ash. The device mainly comprises a sampler, a detection part and a control module, the sampler is provided with a plurality of sampling pipes, each sampling pipe is provided with an adjusting valve, time-sharing sampling is achieved through PLC logic control, and full-time-period fine coverage is ensured. The separation component separates fly ash from gas and collects a fly ash sample, and the detection component integrates a spectral analysis unit and a data processing unit, performs spectral analysis on the fly ash sample and calculates the carbon content. According to the method, multiple objective functions such as the fly ash carbon content, the combustion efficiency and the system stability are optimized at the same time by selecting multi-dimensional equipment process parameters and fly ash measurement data and adopting an evolutionary optimization algorithm, global optimization is achieved, the dependency relationship among the process parameters is fully considered, falling into a local optimal solution is avoided, the optimization efficiency is improved, and the method is suitable for popularization and application. The method can systematically coordinate the contradictory relation among all targets, achieves the maximization of the operation efficiency of the system while detecting the fly ash, and enables the combustion system to operate stably.

The present invention discloses multistage membrane apparatus and a method for separating gases from a crude gas stream a gas to be separated, a main remaining gas and optionally one or more further gas components, wherein in the apparatus comprises a feed stream separation stage, a first permeate separation stage and a second permeate separation stage, each stage being a membrane separation stage with gas separation membranes.

The utility model relates to the technical field of carbon dioxide capture, in particular to a gas distributor and a carbon dioxide absorption tower. The gas distributor comprises an inner cylinder, a perforated plate and a guide plate group, a gas flow channel is formed between the outer peripheral surface of the inner cylinder and the inner peripheral surface of a tower body, and a gas inlet communicated with the gas flow channel is formed in the tower body; a plurality of through holes are formed in the perforated plate, and the perforated plate is connected to the top end of the inner cylinder; the two guide plate groups are symmetrically arranged on the two sides of the inner cylinder by taking the longitudinal axis section of the gas inlet as a symmetric plane; and each flow guide plate group comprises a plurality of flow guide plates which are distributed at intervals along the outer circumferential direction of the inner cylinder body. Smoke entering the gas flow channel can be divided into a plurality of gas flows through the two flow guide plate sets, the smoke is rapidly dispersed, meanwhile, gas and liquid can be separated in the downward flowing process of the gas flows, and therefore liquid drop entrainment is reduced; and a plurality of air flows are reflected upwards by the tower bottom, penetrate through the perforated plate and are further homogenized, so that uniformly distributed air flows are formed.

Example gas recovery systems disclosed herein include a source gas conditioning assembly comprising a compression component and swing adsorption component configured to provide a conditioned source gas, a first membrane assembly to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide plant assembly to provide a carbon dioxide product stream and an enriched recycle stream, and a standalone membrane assembly at least selectively fluidly coupled to the enriched recycle stream, and separates the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream. The swing adsorption component is at least selectively coupled to the enriched recycle stream. The source gas conditioning assembly is fluidly coupled to the recycle stream, and at least selectively coupled to the hydrocarbon enriched recycle stream.

The utility model discloses an oil drive type efficient multi-stage integrated oil-gas separator which comprises a base, and the base is upwards connected with a first-stage filtering shell and a second-stage filtering shell. The base is downwards concaved to be provided with an oil cavity, an active oil drive type oil-gas separation structure is arranged in the first-stage filter shell, the top of the first-stage filter shell is connected with a gas inlet used for introducing blow-by gas of a crankcase, and the first-stage filter shell is downwards communicated with the oil cavity; an oil outlet through which oil flows back into the crankcase is formed in the lowest position of the oil cavity; the bottom of the primary filter shell is connected with a breather pipe; a filter element is arranged in the secondary filter shell, a purified gas outlet is formed in the top of the secondary filter shell, and the purified gas outlet is communicated with a gas outlet part of the filter element; the air inlet part of the filter element is connected with an air inlet cavity; and the breather pipe extends into the secondary filter shell and is communicated with the air inlet cavity. According to the oil-gas separation device, blow-by gas is subjected to two-stage separation through the separation disc and the filter element, the separation efficiency of the oil-gas separation device is remarkably improved, the emission PN is greatly reduced, and the emission regulation requirements of an open crankcase ventilation system are met.

Currently the gas separation techniques available in the industry have many drawbacks such as particle attrition, low adsorption rate, gas leakage and the like. The disclosed portable modular rotary true moving bed for gas separation helps in overcoming these drawbacks. The disclosed gas reactor includes an inner tube, an outer tube, and an outer jacket. The inner tube which is fixed to an internal frame includes a set of box modules filled with adsorbent material. The internal frame helps the inner tube to rotate in a single direction. The outer tube and the outer jacket which is fixed to an external frame include ports which helps in letting in and out gaseous mixture and circulating heating medium and cooling medium. The design of the portable modular rotary true moving bed helps in using it in small-scale gas separation such as in automobiles, trucks, and ships.

The invention discloses a multi-amino absorbent for carbon dioxide capture and a method for capturing carbon dioxide from a gas mixture, and belongs to the technical field of gas separation and carbon capture, utilization and storage. The multi-amino absorbent at least comprises a first component and a second component, wherein the first component is at least one N-hydroxyalkyl-N '-hydroxyalkyl-alkane diamine; the second component is at least one organic amine different from the first component, and the organic amine contains amino groups which are not primary amino groups and does not contain steric hindrance amino groups; and a solvent and optionally an additive. The method for capturing carbon dioxide from a gas mixture includes contacting the polyamino absorbent with a gas mixture containing carbon dioxide, thereby capturing carbon dioxide. The polyamino absorbent disclosed by the invention has the advantages of low carbon dioxide absorption reaction heat in normal-pressure flue gas, high circulating absorption amount, high absorption rate, high desorption rate, low volatility and the like.

The invention relates to the technical field of gas separation membranes, in particular to a gas separation membrane based on a metal organic cage and a preparation method and application of the gas separation membrane based on the metal organic cage, a solution containing metal salt, an organic ligand and an organic solvent is prepared and reacts for 2-160 h at the temperature range of 50-200 DEG C, and a metal organic cage material is obtained; preparing a water-phase dispersion liquid containing a metal organic cage and an organic-phase reaction liquid containing polyacyl chloride or polyaldehyde; placing the organic phase reaction liquid on the surface of a support membrane to obtain a support membrane adsorbing an organic phase monomer; placing the water-phase dispersion liquid on the surface of a support membrane adsorbing an organic-phase monomer to obtain a nascent state separation membrane; the operation is repeated, the organic phase reaction liquid and the water phase dispersion liquid are poured on the surface of the nascent state separation membrane for multiple times, and the gas separation membrane based on the metal organic cage is obtained. The metal organic cage gas separation membrane prepared by the invention has high CO2 permeation rate, relatively high CO2 / N2 and CO2 / H2 separation factors and good long-term operation stability.

A polymer composition for carbon dioxide gas separation, the polymer composition comprising a polymer and a plurality of supramolecular structures, wherein the supramolecular structures are configured to selectively and reversibly adsorb carbon dioxide.

The invention provides a polyimide multilayer composite membrane material as well as a preparation method and application thereof, and belongs to the technical field of gas separation. According to the method, through collaborative design of a functional support layer, a gradient MOF layer and an ultrathin selection layer structure, the problems of support layer pore seepage, MOF agglomeration, weak interface bonding and the like in an existing composite membrane material are solved. The preparation method comprises the following steps: firstly, carrying out electrostatic spinning on a polyamide acid glue solution, and synchronously introducing dopamine by adopting a chemical imidization method to prepare a functionalized polyimide fiber membrane containing hydroxyl and amino on the surface, so that the mechanical property of a supporting layer and the MOF anchoring capability are remarkably improved; growing MOF layers with different particle sizes on the surface of the fiber membrane by regulating and controlling the concentration gradient of ligand / metal salt and the reaction time, and passivating through a silane coupling agent after each step of growth so as to avoid heterogeneous nucleation and construct a gradient structure; after the MOF gradient layer is subjected to Ar plasma pretreatment to introduce hydroxyl, the ultrathin polyamide selection layer is formed by utilizing interfacial polymerization of fluorine-containing acyl chloride and a macrocyclic amine monomer, and the ultrathin polyamide selection layer is suitable for gas separation work.

The utility model discloses a gas-liquid shunting device which comprises an obliquely arranged guide plate, a plurality of through holes penetrating through the guide plate are formed in the guide plate, the through holes are obliquely arranged, the high ends of the through holes are located on one side of the high end of the guide plate, and the low ends of the through holes face one side of the low end of the guide plate. The utility model has the advantages of novel structure and strong practicability. By means of the gas-liquid flow dividing device, hot air can be rapidly cooled, condensed water is separated from hot air water, the condensed water is collected, and after a certain amount of water is collected, the condensed water is reasonably discharged. The device is a special device for liquid-gas separation aiming at waste liquid contained in exhaust gas.

The invention relates to a gas recovery downhole axis jet reinforced oil-gas-water three-phase separation device which comprises a degassing structure and an oil-water separation structure, the oil-water separation structure is arranged in the middle in the axial direction, the degassing structure surrounds the oil-water separation structure, and gas-containing mixed liquid firstly enters the degassing structure to be degassed and then enters the oil-water separation structure; the degassed oil-water mixed liquid enters an oil-water separation structure for oil-water separation; the degassing structure comprises a shell formed by sequentially connecting an upper sleeve, a bridge type channel, a middle sleeve, a connector and a lower sleeve, a gas chamber is arranged in the middle sleeve, the gas chamber is in threaded connection with a connector of a gas separation cavity, the gas separation cavity is located in a three-phase mixing cavity, and the three-phase mixing cavity is connected with a settling bin; an ascending channel is arranged on the inner wall of the lower sleeve, the ascending channel, the three-phase mixing cavity, the gas separation cavity, the gas chamber and the middle sleeve are sequentially communicated, the middle sleeve is communicated with the upper sleeve through a bridge type channel, and the upper sleeve is provided with a gas outlet. According to the invention, oil-water separation is carried out after gas phase separation, so that the service life of equipment is prolonged, and the exploitation cost is reduced.

The utility model relates to the technical field of semiconductor tail gas treatment, in particular to a plasma tail gas treatment device which comprises a reaction assembly, a cooling pipe, a washing assembly, a water-gas separation assembly and a gas outlet pipe, the washing assembly comprises a water tank and a washing pipe, and the cooling pipe and the washing pipe are both fixedly installed above the water tank; the reaction assembly comprises a reaction cavity, an air inlet pipe and a plasma torch; an annular air plate for inputting combustion air is connected between the reaction cavity and the cooling pipe; spraying pipes for washing gas are arranged in the water tank and the washing pipe; the water-gas separation assembly comprises a water-gas separation pipe and a water-gas separation mechanism. According to the utility model, the plasma moment and the washing assembly are used for carrying out full treatment and spray hydrolysis on process gas, so that water-soluble substances are discharged as wastewater, and the treated gas reaching the standard is discharged to a common affair central system, so that full treatment of waste gas is completed; and the air supplementing mechanism is arranged for secondary air supplementing, and meanwhile, when the plasma moment loses efficacy, the air flow can be increased to dilute the waste gas.

The invention provides a composite MOF membrane for gas separation and a preparation method thereof. The composite MOF membrane comprises a substrate and an MOF material loaded on the substrate; the MOF material is a compound of MOF-A and MOF-B; and the MOF-A is glass MOF. The preparation method comprises the following steps: preparing an MOF-B suspension; preparing an MOF-A suspension liquid; carrying out suction filtration on the MOF-B suspension to a substrate to obtain a first MOF membrane, continuously carrying out suction filtration on the MOF-A suspension to obtain the first MOF membrane, drying to obtain a second MOF membrane, carrying out heat treatment on the second MOF membrane to melt the second MOF membrane, and cooling to obtain the composite MOF membrane. The glass MOF can be melted into a liquid state through heat treatment, and is quickly cooled to solidify the MOF liquid to form glass. In the melting process, the MOF glass loses a long-range disordered structure, a short-range ordered unit is reserved, and a grain boundary is eliminated. As a repairing agent, defects of a conventional MOF film are repaired, and a defect-free, continuous and compact composite film is obtained.

According to the liquid accumulator, the rolling rotor compressor and the air conditioner, shielding faces are matched with fisheye vent holes, when gas passes through the fisheye vent holes, the gas can be exhausted from one sides of the shielding faces of the fisheye vent holes, the two shielding faces in each pair are distributed on the sides, away from each other, of the two fisheye vent holes, and the two fisheye vent holes are communicated with each other. The two fisheye vent holes are formed in the liquid storage device, gas in the two vent holes collides and converges between the two fisheye vent holes after being exhausted, the flow speed of the collided gas is reduced, refrigerating machine oil in refrigerant gas is separated out, the separated refrigerating machine oil drips into the bottom of the liquid storage device, and when the liquid level reaches a certain height, the refrigerating machine oil can flow back to the pump body through the oil return hole; according to the device, the flowing direction of the gas when the gas penetrates through the fisheye vent holes is changed, oil-gas separation is assisted through collision of the gas, the gas flow oil separation effect is improved, the refrigerant gas and refrigerating machine oil are separated more sufficiently, and the oil-gas separation efficiency is improved. And the refrigerating or heating capability of the air conditioner during use is improved.

The invention relates to the technical field of gas separation and purification, in particular to a method and system for recycling hydrogen in mixed gas through pressure swing adsorption. The method comprises the following steps: performing multi-layer adsorption impurity removal on mixed gas containing 20-25% of silane, 10-15% of disilane and 60-70% of hydrogen, and cooling to 22-28 DEG C; the mixed gas subjected to primary impurity removal enters a pressure swing adsorption device, and an adsorbent in the adsorption device is modified activated carbon. The system comprises a mixed gas cylinder, a pretreatment unit, a pressure swing adsorption unit and a hydrogen collection unit which are connected in sequence. By adopting the pressure swing adsorption method, the hydrogen recovery rate is remarkably increased and can reach 93%, the purity can reach 99.2% or above, and the strict requirement of high-end industrial production for high-purity hydrogen can be met.