849 results about "Pressure swing adsorption" patented technology

The invention discloses a model predictive control-based vacuum pressure swing adsorption carbon capture system optimization control method, which comprises the following steps of: performing an open-loop step experiment on a vacuum pressure swing adsorption carbon capture system by taking a cycle period as a unit step length to obtain a dynamic characteristic experiment curve of the vacuum pressure swing adsorption carbon capture system; according to data corresponding to the dynamic characteristic experiment curve, a discrete state space model representing the dynamic characteristics of the vacuum pressure swing adsorption carbon capture system is obtained through identification through a subspace identification method, the discrete state space model is amplified into an incremental state space model, and the incremental state space model is used for representing the dynamic characteristics of the vacuum pressure swing adsorption carbon capture system. Deriving the incremental state space model to obtain a prediction model; constructing a rolling optimization objective function of the prediction model, inputting the scheduling instruction into the prediction model, and designing a constrained MPC control algorithm based on the prediction model to obtain the MPC controller of the vacuum pressure swing adsorption carbon capture system; and the CO2 recovery rate and purity are precisely tracked and controlled through the MPC controller of the vacuum pressure swing adsorption carbon capture system. The technical problems that the CO2 recovery rate adjusting speed is low, the stability is poor and the CO2 purity deviates from the set value in a traditional control method can be solved, and meanwhile the anti-interference capacity and the multi-target optimization performance of the system are improved.

The invention discloses a process for preparing ultra-pure hydrogen by recovering and purifying hydrogen. The process comprises the following steps: nitrogen replacement: carrying out three times of pressurization-decompression circulation on an adsorption tower and a pipeline; pretreatment of raw materials: hydrogen-containing tail gas is treated by a buffer tank, a compressor, a desulfurization tower and a horizontal adsorption tower and then enters a PSA (Pressure Swing Adsorption) system; pSA purification: a 6-2-3 / P process is adopted, two towers in six adsorption towers perform adsorption at the same time, and hydrogen larger than or equal to 99.99% is produced; regeneration of the adsorbent is completed through three-stage pressure equalizing and reducing, clockwise / anticlockwise pressure reducing, product hydrogen flushing and three-stage pressure equalizing and boosting; refining by a membrane separation unit: carrying out membrane separation on PSA hydrogen to produce ultrapure hydrogen of which the purity is greater than or equal to 99.999%, and returning trapped gas to a compressor; and condensate water recovery: carrying out steam stripping and deoxygenization on the process condensate liquid, and then taking the process condensate liquid as boiler feed water. The process integrates PSA and membrane separation technologies, realizes efficient and energy-saving ultrapure hydrogen preparation, and is suitable for the fields of green hydrogen energy storage, electronic industry, high-end chemical industry and the like.

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.

The invention relates to the technical field of molecular sieve and dust separation, in particular to a pressure swing adsorption molecular sieve screening device which is characterized in that the upper end of a screening pipe is connected with the upper end of a dust conveying pipe, and the lower end of the dust conveying pipe is connected with the lower end of a primary dust collecting pipe; a plurality of air supply branch pipes are arranged in the lower portion of the screening pipe, a feeding port is formed in one side of the upper portion of the screening pipe and connected with a feeding hopper, the feeding hopper is connected with a feeding pipe, and a transverse dispersing device and a longitudinal dispersing device are arranged on the inclined face in the feeding hopper. And a screen is arranged in the screening pipe, and the screen is arranged between the feeding port and the air supply branch pipe. The air supply branch pipe on the lower portion of the screening pipe provides airflow into the screening pipe and is used for separating dust and a molecular sieve; the device is used for regularly screening and removing pulverized molecular sieve particles, so that the requirement of frequent replacement caused by aging and crushing of the molecular sieve is reduced, the production cost is reduced, and the oxygen production efficiency and the product quality are improved.

The invention belongs to the technical field of hydrogen purification equipment, and discloses pressure swing adsorption hydrogen purification equipment which comprises an adsorption tower, a gas inlet pipe is fixedly connected to one end of the adsorption tower, a first cavity and a second cavity are formed in the adsorption tower, a partition plate is installed between the first cavity and the second cavity, and the partition plate is rotationally connected with the adsorption tower through a rotating assembly. Adsorbent layers are mounted at the top end and the bottom end of the partition plate, and the two adsorbent layers are arranged in the first cavity and the second cavity correspondingly; the rotating assembly comprises first rotating shafts fixedly mounted on the two sides of the partition plate, one end of one first rotating shaft is fixedly connected with a gear, a mounting plate is arranged on one side of the gear, and during work, the partition plate is driven by the driving assembly to turn over by 180 degrees, so that the positions of the two adsorbent layers in the first cavity and the second cavity are exchanged; and not only can the complexity of operation during replacement of the adsorbent layer be reduced, but also shutdown treatment is not needed, so that continuous and stable operation of the device is ensured.

The invention relates to a method for preparing carbon monoxide by reverse water gas shift, which comprises the following steps: under the catalytic action of a supported catalyst, carrying out reverse water gas shift reaction, carrying out pressure swing adsorption treatment on mixed gas generated in the reaction process, and desorbing to obtain carbon monoxide. By coupling the reverse water gas shift reaction and the pressure swing adsorption process and exerting the synergistic effect of the reverse water gas shift reaction and the pressure swing adsorption process, efficient and rapid separation of carbon monoxide is realized, the reverse water gas shift reaction is promoted to be carried out in the forward direction, the reaction requirement of reverse water gas shift is reduced, the reverse water gas shift reaction is carried out under relatively mild conditions, and the reaction efficiency is improved. The long-period efficient conversion of carbon dioxide is realized, and the conversion rate of carbon dioxide and the selectivity of carbon monoxide are further improved.

The invention discloses a low-concentration carbon dioxide trapping system and method, and belongs to the technical field of gas separation and trapping. The system comprises an air filter, a zeolite adsorption rotating wheel, a desorption heater, a desorption fan, a centrifugal fan, a pressure swing adsorption module (at least comprising double towers), a vacuum pump, a CO2 storage tank, a rear-end purification and utilization system and a control system. According to the method, trapping is realized through pretreatment, first-stage adsorption concentration, desorption transfer, second-stage purification, collection and storage and circulating operation. The zeolite adsorption rotating wheel is used for adsorbing and concentrating low-concentration CO2, and then the low-concentration CO2 is purified through the pressure swing adsorption module, so that the problems of low low-concentration trapping efficiency and high energy consumption in the prior art are solved. The device has the advantages of high trapping efficiency, low energy consumption, continuous operation, wide application scene and the like, is suitable for trapping low-concentration CO2 in atmosphere and industrial tail gas, and provides an efficient technical scheme for carbon emission reduction.

The utility model discloses a modularized pressure swing adsorption oxygen generation device which comprises an oxygen generation tank, an air inlet mechanism arranged on one side of the oxygen generation tank, an auxiliary mechanism mounted on the surface of the oxygen generation tank, a collecting mechanism arranged on one side of the oxygen generation tank, and a detection mechanism mounted below the oxygen generation tank. According to the oxygen generation device, air entering the oxygen generation tank can be subjected to auxiliary filtering treatment, the cleanliness of the air is improved, a filtering part can be subjected to auxiliary cleaning, the situation that the filtering part is blocked or unsmooth in air inflow due to filtered impurities is reduced, meanwhile, the oxygen generation tank is provided with a detection mechanism, oxygen is conveniently detected, and the oxygen generation efficiency is improved. When the detected purity is not enough, auxiliary filtering and purifying treatment can be carried out, the oxygen production purity can be improved, an auxiliary mechanism is arranged on the oxygen production tank, auxiliary cooling and heat dissipation treatment can be conveniently carried out on conveyed oxygen production gas, oxygen production treatment can be better carried out, and meanwhile, a collecting mechanism is arranged on the oxygen production tank; other gases generated during oxygen production can be conveniently collected.

The invention belongs to the technical field of alkane processing, and particularly relates to a process for preparing isopentene by dehydrogenation of isopentane, a catalyst and a tert-amyl alcohol preparation process. The process for preparing isopentene by dehydrogenation of isopentane comprises an isopentane dehydrogenation device and an isopentene separation device, in the isopentane dehydrogenation device, a dehydrogenation reactor is a fixed bed adiabatic reactor and is filled with a Pt-Sn-K / alumina type alkane dehydrogenation catalyst, the catalyst has hydromethanation performance under the CO2-containing dehydrogenation reaction condition, and the arrangement and operation of a dehydrogenation reactor group comprise a mode A, a mode B or a mode C; the isopentene separation device comprises a cooling separation system, a pressure swing adsorption separation system and an optional rectification system. The tert-amyl alcohol is further prepared from isoamylene under the conditions of a fixed bed hydration reactor, ethylene glycol monobutyl ether and other solvents, and the tert-amyl alcohol product is obtained through separation. The process is superior to the prior art on the whole, and has certain application prospects.

The present invention discloses a rotary valve, which includes: a valve body, which is a cylindrical structure, and is provided with three flow channel groups; and a valve sleeve, whose coaxial sealing sleeve is provided on the valve body, and the valve sleeve is evenly provided with multiple through holes, the inner end of each through hole extends to form a vertical groove, and the vertical groove is divided into three sections along the vertical direction, corresponding to the ports of different flow channel groups respectively. A switching valve is provided at the through hole, and the switching valve connects the through hole to the two sections of the vertical groove, thereby switching the corresponding two flow channel groups to a working state. The valve body rotates around the axis relative to the valve sleeve so that the multiple through holes are combined and connected with the ports of the two flow channel groups in the working state, thereby changing the process operation mode. Each through hole is connected to at most one port of the valve body. The present invention also discloses a pressure swing adsorption device. The rotary valve of the present invention can switch the working state of the flow channel group, realize online switching of the timing process, meet the demand for improvement of process conditions due to fluctuations in on-site raw materials, and enhance production flexibility.

The invention provides a replacement vacuum pressure swing adsorption ethylene recovery system and method based on molecular sieves, the system comprises a plurality of adsorption towers which are connected, the adsorption towers are filled with molecular sieve adsorbents, the bottoms of the adsorption towers are connected with a feeding pipeline, an ethylene discharging pipeline and a replacement pipeline, the feeding pipeline is connected with feed gas, and the ethylene discharging pipeline is connected with the replacement pipeline. The ethylene discharge pipeline and the replacement pipeline are both connected with the ethylene product buffer tank, and the top of the adsorption tower is connected with a residual gas discharge pipeline; ethylene can be efficiently recovered by adopting the molecular sieve adsorbent, high-purity ethylene can be obtained by combining with reasonable step sequence setting, and a high ethylene recovery rate is kept; ethylene is recycled through replacement vacuum pressure swing adsorption, and the method is low in energy consumption, simple in technological process, convenient to operate and maintain and low in investment cost; the purity of ethylene is guaranteed through the replacement step, meanwhile, vacuum is added, ethylene can be recycled to a greater extent, it is guaranteed that precious resources are not wasted, meanwhile, the circular economy concept is met, and cyclic utilization of the resources is achieved.

The invention discloses an oxygen separation device for a pressure swing adsorption system, and relates to the technical field of oxygen separation. The oxygen separation device for the pressure swing adsorption system comprises an oxygen separation tank; the central shaft is arranged in the oxygen separation tank in the axial direction of the oxygen separation tank and can rotate around the axis of the central shaft; the zeolite molecular sieves sleeve the outer side of the central shaft and are uniformly distributed along the axial direction of the central shaft; and the up-down transposition mechanism is arranged on the zeolite molecular sieve, can synchronously act along with the rotation of the central shaft, and is used for driving the zeolite particles to generate position alternation in the axial direction. By arranging the up-down transposition mechanism synchronously acting with the rotary drum, the zeolite particles are driven to continuously perform ordered position alternation in the axial direction, so that dynamic cyclic replacement of adsorption areas is realized, the zeolite particles at different positions alternately participate in the adsorption process, the load of each area is effectively balanced, and local premature failure is prevented.

The invention belongs to the technical field of petroleum refining, and relates to a high-purity hydrogen recovery process for improving denitrification efficiency based on a PSA (Pressure Swing Adsorption) device, which comprises the following steps: carrying out primary adsorption impurity removal after pretreatment and pressure regulation on raw material gas, carrying out gas-liquid separation, pretreatment and pressure regulation on the obtained hydrogen-rich gas, and then carrying out membrane separation; the generated hydrogen-rich permeated gas is subjected to pressure regulation and then is sequentially input into a second-stage PSA device and a third-stage PSA device for further adsorption and purification, and finally finished hydrogen with the purity not lower than 99.9% is obtained. The membrane separation technology is adopted for selective separation of hydrogen and nitrogen, the membrane separation unit is arranged at the outlet of the first-stage PSA device, nitrogen is removed from the source, meanwhile, desorbed gas of the third-stage PSA device and retention gas of the membrane separation unit are combined for combustion, nitrogen accumulation in the system is avoided, the nitrogen circulation amount in the system is reduced, and the energy consumption of the system is reduced. The hydrogen recovery rate can be effectively improved while the adsorption efficiency is improved, the process is simple, the investment cost is low, the implementation period is short, and remarkable economic benefits and process advantages are achieved.

The present invention relates to the technical field of adsorbents, and specifically discloses a pressure swing adsorption hydrogen purification adsorbent for synthesizing morpholine and a preparation method thereof. The specific preparation method comprises the following steps: Step a: grinding the binder into powder for standby; Step b: mixing 13X molecular sieve, binder, structure stabilizer and calcium compound in a certain proportion, and forming a spherical compound A after mixing; Step c: pre-drying the spherical compound A, followed by roasting, washing, drying and activation to obtain the adsorbent. The pressure swing adsorption hydrogen purification adsorbent for synthesizing morpholine provided by the present invention has good adsorption effect, can tolerate high concentration of CO2, and a structure stabilizer is added to the adsorbent, so that the prepared adsorbent has a stable structure and can tolerate the influence of gas flow scouring, particle and bed vibration on the adsorbent. Finally, the preparation method of the adsorbent of the present invention is simple and easy for industrial production.

The invention provides an adsorption process for recovering ethylene from refinery dry gas through combination of MOF and zeolite, raw material gas is refinery dry gas, a main body contains hydrogen, carbon dioxide, C1-C3 low-carbon hydrocarbon gas and the like, the content of C2H4 is about 10%, a pre-decarburization process and an associated bed process are introduced, the adsorption capacity of an adsorbent is protected, and the content of ethylene is reduced. The non-compliant purity ethylene gas in the pressure swing adsorption process is re-enriched and recovered through an associated bed; in the initial stage of adsorption separation, after CO2 is removed through a customized or commercialized adsorbent, C2H4 enrichment and purification are directly carried out, and by introducing an associated bed, ethylene in gas passing through the adsorption process and ethylene gas in the preliminary desorption process of the adsorption bed are captured again, so that the ethylene recovery rate in the process is improved.

Disclosed in the present invention is an integrated reforming power generation test system having wide-range fuel adaptability, comprising a fuel supply subsystem, a catalytic reforming subsystem, a hydrogen purification subsystem, a power generation subsystem, and a test monitoring subsystem. A fuel pump and a fuel delivery pump are connected to a water-gas shift reactor by means of an evaporator and a reformer, the water-gas shift reactor is connected to a pressure swing adsorption device by means of a first gas-liquid separator, the pressure swing adsorption device is connected to a fuel cell stack by means of a hydrogen buffer tank, and a gas chromatograph is connected to the reformer by means of a third gas-liquid separator and to the water-gas shift reactor by means of a second gas-liquid separator. By using a variety of fuel resources to produce electricity, the present invention breaks through the limitation of the scope of traditional single-fuel reforming power generation systems, ensures the reliability of electricity supply, gets rid of the dependence on specific fuels, enhances regional energy safety, and improves the flexibility of energy supply.

A process and a plant for the production of hydrogen or for the synthesis of ammonia, said process comprising the following steps: (a) performing a reforming process (101) of a hydrocarbon feedstock (1) to generate a raw syngas (2), said reforming process comprising at least an autothermal reforming step (104) in presence of oxygen-enriched air or pure oxygen (3) produced by an air separation unit (ASU; 103); (b) subjecting said raw syngas (2) to a post-treatment (102) providing hydrogen (H2; 4), a CO2-enriched stream (5), and a residual gas (6); said post-treatment comprising at least a water gas shift conversion step (105) of said raw syngas into a shifted syngas (7), a pressure swing absorption step (106), and a cryogenic separation step (107); wherein said pressure swing absorption step produces said hydrogen and a first tail gas (8) comprising carbon monoxide (CO), carbon dioxide (CO2), residual hydrogen (H2) and unreacted hydrocarbon feedstock from the shifted syngas (7), and said cryogenic separation step separates the CO2-enriched stream and a second tail gas (9) from said first tail gas; said post-treatment (102) comprising a further separation step (120) of a CO2-containing stream (11) and of the residual gas (6) from said second tail gas; (c) recycling said residual gas (6) as feed to said reforming process and / or as fuel to one or more fired heater(s) (10) of said process; (d) optionally feeding a portion (4.8) of said hydrogen (4) obtained in step (b) as fuel to one or more fired heater(s) of said process; (e) optionally an ammonia synthesis step (110) wherein said hydrogen (4) and a nitrogen (N2)-containing stream (12) produced by said ASU (103) are reacted in a given stoichiometric ratio and in ammonia (NH3) synthesis conditions to obtain an ammonia-containing product (13).

The invention discloses a method and a device for controlling the flow rate of pressurized air flow of a bed layer of a pressure swing adsorption device, and relates to the technical field of adsorption control. The method and the device for controlling the flow rate of the pressurized air flow of the bed layer of the pressure swing adsorption device comprise the following steps: S1, acquiring pressure difference state data in real time, and preprocessing the pressure difference state data; s2, slip sheet displacement balance is carried out on the differential pressure state data; s3, throttling opening response is conducted on the pressure difference state data; s4, setting a movement boundary of the slip sheet; and S5, the pressure difference state data, the sliding vane displacement balance result and the throttling opening response result are synthesized to execute buffer energy consumption evaluation. The problems that the throttling opening is fixed, the gas flux cannot be dynamically adjusted according to the actual working condition and the adjusting rigidity and the energy efficiency are reduced due to the fact that the front and back pressure difference change of the adsorption tower cannot be sensed in real time in the throttling process and a pressure difference driven feedback adjusting mechanism is lacked are solved.

Provided are a natural gas helium extraction device and a natural gas helium extraction method. The natural gas helium extraction device comprises a primary concentration part, a dehydrogenation and dehydration part, a secondary concentration part, and a final purification part. The primary concentration part comprises a first compressor, a first preheater, and a first membrane separator connected in sequence. The dehydrogenation and dehydration part comprises an oxygen delivery pipe, a mixer, a plurality of dehydrogenation towers connected in parallel, a low-temperature water separator, and a water remover. The secondary membrane separator of the secondary concentration part comprises a permeate gas outlet and a non-permeate gas outlet. The non-permeate gas outlet is connected to the primary concentration part. The final purification part comprises a nitrogen circulating cooling component and a pressure swing adsorption (PSA) device. The PSA device is connected to the permeate gas outlet of the secondary membrane separator and is used to output high-purity helium. The nitrogen circulating cooling component, the PSA device, and the low-temperature water separator form a cooling loop. The natural gas helium extraction device and the natural gas helium extraction method can significantly reduce safety risks and effectively reduce equipment costs.

The invention relates to a zero-emission technology for producing power in a thermal plant using natural gas (NG) or liquefied natural gas (LNG), followed by capturing carbon dioxide (CO2) and converting it into green Dimethyl Ether (DME). The process integrates a gas-based combined cycle power plant with CO2 capture through Pressure Swing Adsorption (PSA) (106) and Monoethanolamine (MEA) purification. Captured CO2 undergoes a Reverse Water Gas Shift (RWGS) (306) reaction at temperatures above 900°C to form CO, which, along with syngas from steam methane reforming (308a, 308) at 525°C to 900°C and 25 ATA pressure, is converted into DME using a Cu / ZnO / Al2O3 catalyst at 250-300°C and 25-40 ATA. The process achieves an energy efficiency factor of 93.04%, producing 92 kg of DME per 48 kg of LNG, with a 94% greenhouse gas abatement, contributing to net-zero emissions (NZE) while generating bulk thermal power.

The invention relates to the technical field of waste gas recycling, in particular to a refining agent regeneration method and system. The refining agent is used for removing impurities in polyolefin hydrocarbon raw materials, and the regeneration method comprises the following steps: sequentially and repeatedly purging and cooling the polyolefin refining agent by using nitrogen to respectively obtain first regeneration cooling exhaust gas and a purging refining agent; sequentially carrying out liquid separation and first pressure swing adsorption on the first regeneration exhaust gas to obtain a first hydrocarbon adsorption material; pressurizing and displacing the purging refining agent by using a polyolefin raw material to respectively obtain mixed exhaust gas and a regenerated refining agent; the mixed exhaust gas is subjected to liquid separation and second pressure swing adsorption in sequence, and a second hydrocarbon adsorption material is obtained; and desorbing the first hydrocarbon adsorption material and the second hydrocarbon adsorption material to obtain the polyolefin recycled material. According to the regeneration method, a three-stage coupling separation system of purging regeneration, liquid separation and pressure swing adsorption is constructed, and compared with a traditional thermal regeneration method, the recovery rate of hydrocarbon raw materials in regenerated exhaust gas of the refining agent can be increased only through pressure swing adsorption.

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 invention relates to an adsorbent for nitrogen production and a preparation method thereof, and belongs to the technical field of air nitrogen production. The technical problem to be solved by the invention is to provide a low-cost preparation method of the adsorbent for nitrogen production, and a carbon molecular sieve is modified by orthosilicate, so that the adsorbent has a very good adsorption effect. The method comprises the following steps: a, mixing and molding: mixing orthosilicate and phenolic resin, and extruding and molding into particles; and b, carbonizing: heating the particles obtained in the step a to 700-1000 DEG C under a protective atmosphere, and carbonizing to obtain the adsorbent for nitrogen production. The adsorbent for nitrogen production is prepared by mixing the orthosilicate and the phenolic resin, the method is simple, oxygen can be well adsorbed, nitrogen and oxygen can be well separated, the adsorbent can be used for preparing nitrogen through pressure swing adsorption, and the nitrogen production efficiency is high.

The invention discloses an air separation pressure swing intelligent adsorption pollution discharge method, system and device combined with a pressure curve, and relates to the technical field of intelligent pollution discharge. The air separation pressure swing intelligent adsorption pollution discharge method, system and device combined with the pressure curve comprises the following steps: S1, collecting running state data in real time, and preprocessing the running state data; s2, performing pressure disturbance intensity analysis on the operation state data; s3, performing real-time analysis and feature extraction on the pressure curve; s4, performing start-stop risk prediction on the operation state data; and S5, integrating the operation state data, the pressure disturbance intensity analysis result and the start-stop risk prediction result to execute a pollution discharge control instruction. The problems that an air compressor and a pressure swing adsorption system lack linkage control based on pressure change, pollution discharge easily causes pressure fluctuation and frequent starting and stopping, energy consumption is increased, equipment abrasion is caused, and an existing control mode lacks a feedforward adjusting mechanism are solved.

The invention provides a crude helium storage and recycling system for a cryogenic helium extraction process and a recycling control method, and relates to the technical field of helium production. The crude helium storage and recycling system for the cryogenic helium extraction process comprises a membrane separation device, a permeable gas supercharging device, a pressure swing adsorption device, a low-temperature adsorption device, a first storage tank group, an unloading device, a second storage tank group, a first detection unit, a second detection unit, a first recycling loop, a second recycling loop, a third recycling loop and a control device. According to the technical scheme, the first detection unit is arranged to monitor the concentration of methane and carbon dioxide in the crude helium at the outlet of the pressure swing adsorption device, high-concentration impurities can be effectively prevented from entering the low-temperature adsorption device, the problem of equipment freezing and blocking caused by condensation is avoided, the crude helium recycling path is dynamically adjusted, and the recycling efficiency of the crude helium is improved. And the gas meeting the standard is sent to the next stage for treatment, so that the helium quality and the production efficiency can be improved in the cryogenic helium extraction process.

The invention relates to the technical field of organic solid waste treatment, in particular to a process system for hydrogen production and co-production of biological natural gas from biological crude synthesis gas, which comprises a purification unit, a hydrocarbon regulation unit, an acid removal unit, a methane upgrading unit, a hydrogen recycling and purifying unit and a methane recycling and purifying unit which are connected in sequence. The purification unit is used for removing impurities through pre-impurity removal, compression, dry-process impurity removal and wet-process desulfurization to produce purified synthesis gas and sulfur; the hydrocarbon adjusting unit is pressurized through a centrifugal compressor and adjusts the hydrogen-carbon ratio; the acid removal unit is used for removing acid gas and organic sulfur; the methane upgrading unit is used for converting CO / CO2 into methane through methanation reaction; and the recycling unit purifies hydrogen through pressure swing adsorption and recycles methane by using a membrane separation technology to produce biogas. The problems of low purity and insufficient raw material utilization rate of the traditional process are solved through the circulation process, the co-production of high-purity hydrogen and biogas is realized, and the additional value of resources is improved.

A hydrogen production system for producing a hydrogen gas product includes a geologic hydrogen source configured to provide a feedstock comprising hydrogen, nitrogen, and helium and purification equipment comprising two or more of: a pressure swing adsorption (PSA) device; a guard bed; a separation membrane; a reactive membrane; or a cryogenic separation device. The purification equipment is configured to receive the feedstock from the geologic hydrogen source and produce a hydrogen gas product, and production of the hydrogen gas product exhibits a carbon intensity score less than 3.0 kg CO2 eq / kg H2.

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

The invention provides a prebaked anode flue gas carbon capture integrated system which comprises an integrated purification unit, a pollutant removal unit and a pressure swing adsorption carbon capture unit which are sequentially connected through a pipeline, flue gas is subjected to dust pre-removal and organic pollutant adsorption of the integrated purification unit and deep treatment of nitrogen and sulfur oxides of the pollutant removal unit, and the flue gas is subjected to carbon capture and carbon capture. According to the invention, the flue gas enters the pressure swing adsorption unit and then is efficiently captured by the pressure swing adsorption unit, and a continuous and synergistic treatment chain is formed in the whole process, so that the heat loss of the flue gas transmitted among the units is obviously reduced, and the energy waste caused by equipment dispersion in the traditional system is avoided; meanwhile, in the aspect of equipment layout, the modular integrated design greatly compresses the occupied area, efficient utilization of an industrial site is achieved, the flue gas treatment cost is reduced, and the flue gas treatment reliability is improved.

The invention relates to the technical field of preparation of catalysts, in particular to a solar-driven CO2 capturing and cracking catalyst, a preparation method and application, and the preparation method comprises the following steps: S1, mixing a solid metal-based carrier precursor with deionized water, performing hydrothermal synthesis in a hydrothermal reaction kettle at 180-220 DEG C for 12-14 hours, and calcining at 300-600 DEG C for 2-4 hours to obtain a porous carrier; s2, co-impregnating a porous carrier with a metal salt solution and the modified impregnation liquid, drying, and calcining in a nitrogen atmosphere at 300-600 DEG C for 2-6 hours to obtain an active component supported catalyst precursor; and S3, mixing a reaction medium and a modified doping solution, compounding with the active component loaded catalyst precursor obtained in the step S2, and drying to obtain the solar-driven CO2 capture cracking catalyst. Through the one-step hydrothermal synthesis and co-impregnation process, the preparation process is simplified, the traditional complex process of separation after CO2 capture is omitted, the comprehensive cost is reduced by more than 30%, and the traditional high-energy-consumption carbon dioxide pressure swing adsorption and temperature swing adsorption technology is completely eliminated.