553results about "Specific gas purification/separation" patented technology

The invention discloses a temperature swing adsorption helium low-temperature purification system which comprises a vacuum cold box, and a first-stage dividing wall heat exchanger, a liquid cold medium Dewar, a high-temperature area adsorption unit, a second-stage dividing wall heat exchanger, a cold head heat exchanger and a low-temperature area adsorption unit are sequentially connected in the vacuum cold box in the gas transmission direction. Wherein the input end of the first-stage dividing wall heat exchanger is connected with the outside through a pipeline, and is used for introducing crude helium; the high-temperature area adsorption unit is used for adsorbing impurity gas with the boiling point temperature being greater than or equal to 77K in the crude helium, and the low-temperature area adsorption unit is used for adsorbing impurity gas with the boiling point temperature being 20K-30K in the crude helium, so that high-purity helium is obtained. According to the invention, not only can high-flow high-component impurity gas with the boiling point of 77K or above be treated, but also high-flow high-component impurity gas with the boiling point of 30K or below can be treated, and high-flow multi-component high-concentration industrial production working conditions can be better matched by adopting physical adsorption of the high-temperature and low-temperature region adsorbents.

The invention discloses a medical oxygen generator with sterilization and dust removal functions, and relates to the technical field of oxygen generators, the medical oxygen generator comprises an oxygen generator shell, a handle, a touch screen, an oxygen generator bottom plate, an air inlet pipe, a dust removal and sterilization device, an air compression device, a heat dissipation pipe, an adsorption tower, a heat dissipation device, a cleaning device and a humidification cup, the air compression device can suck air and compress air, the dust and bacteria removal device can remove pollutants such as dust and bacteria in the air and prevent the pollutants from entering the air compressor to affect the quality of oxygen inhaled by a patient, the heat dissipation device rapidly dissipates heat of the air in the heat dissipation pipe, the adsorption effect of the adsorption tower is improved, and the service life of the adsorption tower is prolonged. The cooled air enters the adsorption tower, the adsorption tower adsorbs nitrogen in the air, the separated oxygen is decompressed and then conveyed into the humidifying cup, and the oxygen humidified by the humidifying cup is conveyed into an oxygen catheter of a patient.

The invention relates to the technical field of oxygen supply monitoring, regulation and control, and discloses a medical oxygenerator multi-source information fusion monitoring evaluation method and system, and the method comprises the following steps: S101, collecting the equipment operation parameters and environment parameters of a medical oxygenerator in real time, and obtaining the physiological demand data of a patient; s102, on the basis of the equipment operation parameters and the environment parameters, constructing coupling characteristics for representing the operation state of the oxygen generator; s103, establishing an environmental quantitative influence model of the environmental parameters on the oxygen production efficiency; s104, performing coupling analysis on the basis of the physiological demand parameters of the patient, the coupling characteristics and the environmental quantitative influence model, and determining a dynamic oxygen supply regulation and control strategy; and S105, monitoring the running state of the oxygen generator in real time, and triggering graded early warning when the oxygen generator is abnormal. Through multi-source data fusion and intelligent regulation and control, the oxygen supply demand of a patient is accurately matched, the environmental adaptability is optimized, the oxygen supply efficiency is improved, a grading early warning mechanism is integrated, intelligent monitoring and abnormal protection are achieved, and the safety and reliability of the oxygen generator are improved.

A process to purify helium from a feed gas stream containing a mixture of at least nitrogen, methane and helium including introducing the feed gas stream into a first helium membrane separation unit, thereby producing a first helium membrane permeate and a first helium membrane residue; introducing at least part of the first residue into a first nitrogen membrane separation unit thereby producing a first nitrogen membrane permeate stream; introducing a stream derived from the first helium membrane permeate into a hydrogen PSA unit thereby producing a helium rich product stream. Wherein a stream derived from the first nitrogen membrane permeate stream exits the system as a fuel gas product stream. Wherein the feed gas stream has a higher heating value, and wherein the first nitrogen membrane permeate stream has a higher heating value at least 5% higher than the higher heating value of the feed gas.

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

The invention provides an oriented ultrathin FER zeolite molecular sieve membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, synthesizing a monodisperse FER zeolite nanosheet with a high length-depth ratio through a hydrothermal method; preparing a seed crystal liquid, and coating the surface of a porous carrier with the seed crystal liquid to form an oriented seed crystal layer; and carrying out hydrothermal epitaxial growth in a secondary growth solution. Through innovative design of seed crystal synthesis and epitaxial growth, the FER zeolite membrane prepared by the method has a structure with high alpha-axis preferred orientation, submicron controllable thickness, compactness and no defect. The membrane can be used for accurately screening gas molecules with small size difference by utilizing six-membered ring pore channels uniformly arranged along an a axis. When helium and methane or carbon dioxide are separated, the membrane shows permeation flux and separation selectivity far superior to those in the prior art, provides a brand new technical approach for efficient and low-energy-consumption recovery of helium and other high-value gases in the industry, and has great industrial application value.

The invention relates to a Kr separation method and system based on selective desorption, a terminal and a storage medium, and relates to the technical field of rare gas purification. Calculating the difference between the quotient of the historical krypton loss amount and the adsorption column mass and the initial unit krypton adsorption amount to generate the actual unit krypton adsorption amount; calculating the quotient between the product of the actual unit krypton adsorption quantity and the mass of the adsorption column and the flow velocity of the single to-be-adsorbed air so as to generate actual adsorption time; controlling the first-stage adsorption column to adsorb the to-be-adsorbed air according to the actual adsorption time so as to generate a to-be-separated adsorption column; controlling the adsorption column cleaning device to clean the adsorption column to be separated according to the actual unit krypton adsorption quantity, and collecting desorbed gas after cleaning to the waste gas storage device; and performing desorption operation on the cleaned adsorption column, controlling a gas collection device to collect desorbed gas, and heating and activating the first-stage adsorption column to recover the adsorption capacity. The application has the effect of reducing krypton loss.

The invention relates to the technical field of oxygen generators, in particular to an oxygen generator with oxygen output concentration monitoring and pre-compensation functions. The oxygen generator comprises a lower buffer valve, a lower buffer communication valve, an upper buffer valve, a lower buffer valve, a data acquisition module, a data processing module and an adjusting module, wherein the data acquisition module is used for acquiring pressure data and oxygen concentration at an outlet of the oxygen generator; the data processing module is used for obtaining the high-pressure degree of each circulation according to the pressure data and the oxygen concentration at the outlet of each cycle of each circulation of oxygen discharge, and then determining the high-pressure duration and the current compensation demand degree; acquiring a slow voltage-sharing demand factor according to the current compensation demand degree and the duration of the high-voltage duration; and the adjusting module is used for adjusting opening and closing of the valve according to the slow pressure equalizing demand. According to the invention, the influence of temperature on the adsorption efficiency of the zeolite molecular sieve is reduced, the concentration of oxygen produced by the oxygen generator is maintained, and the pre-compensation of the oxygen concentration is realized.

The invention discloses a recovery device and method of rare gas He for CVD (chemical vapor deposition) atmosphere, and relates to the field of rare gas recovery, the recovery device of rare gas He for CVD atmosphere comprises an alkaline drying device, a primary filtering device, a helium recovery membrane group, a trace impurity removal device and a precision filtering device which are connected in sequence, the alkaline drying device is connected with a waste gas outlet of the CVD reactor, the primary filtering device is used for preliminarily filtering waste gas to remove particle dust, and an outlet of the precision filtering device is connected with the helium recovery membrane group, so that high-purity helium obtained by the precision filtering device is circularly purified. And efficient recovery and purification of the rare gas He in the CVD atmosphere are realized. By means of the circulating purification design, the helium recovery rate is increased, product losses caused by one-time treatment are effectively reduced, and therefore resource waste is reduced.

The invention belongs to the technical field of tail gas treatment, and relates to a device system and a method for recovering helium from semiconductor manufacturing process tail gas, by adopting a composite device system of an adsorption device, a membrane separation assembly and a gas purification tower, the recovery and purification operation of low-concentration helium containing toxic, corrosive and various rare gas mixed working conditions can be completed, and the helium recovery efficiency is improved. The recovered helium can be purified to 99.999% or above, the recovery rate is high, the purity is high, front and back gas heat exchange is fully utilized, the energy consumption is low, and the helium supply source is further widened; the device system is free of gas emptying in the whole process, reflows, collects and discharges back to a tail gas pipeline, and is suitable for various manufacturing processes of semiconductors.

The invention discloses a normal-temperature natural gas helium extraction and purification system and purification method. The system comprises a first-stage membrane separator, a second-stage membrane separator, a third-stage membrane separator, a pressure swing adsorption unit and the like, helium in natural gas is primarily concentrated through the first-stage membrane separator, after impurities are removed, the natural gas enters the third-stage membrane separator to be further concentrated, and permeated gas enters the second-stage first-section membrane separator to be concentrated to be high in concentration; the helium content in the impermeable gas is extremely low, and the impermeable gas returns to a pipe network; the permeated gas of the second-stage first-section membrane separator enters a fine dehydrogenation unit and a pressure swing adsorption unit, and then high-purity helium is produced; the impermeable gas of the second-stage first-section membrane separator enters the second-stage second-section membrane separator and then returns to the system for circulation; the impermeable gas of the second-stage second-section membrane separator returns to the third-stage membrane separator for recycling; and desorbed gas of the pressure swing adsorption unit returns to an outlet of the first-stage membrane separator for circulation. According to the system, helium in natural gas is purified by adopting very low energy consumption, helium in boil off gas (BOG) in the natural gas liquefaction process can also be purified, and a very good application effect is achieved.

The invention belongs to the technical field of medical equipment, and discloses an oxygen generator which comprises an adsorption cylinder, a compressor, a humidifying cup and a condensation water collection assembly, the adsorption cylinder is filled with an adsorbent for adsorbing nitrogen, the compressor is used for providing pressurized air for the adsorption cylinder, the humidifying cup is used for humidifying oxygen from the adsorption cylinder, and the condensation water collection assembly is used for collecting water from the adsorption cylinder. The humidifying cup is provided with a liquid inlet, the condensation and water collection assembly is provided with a liquid outlet, an air inlet communicated with the compressor and an air outlet communicated with the adsorption barrel, the condensation and water collection assembly is used for condensing water vapor in pressurized air generated by the compressor into liquid, and the liquid is discharged through the liquid outlet and enters the humidifying cup through the liquid inlet so as to supplement water to the humidifying cup; according to the technical scheme, the frequency that water needs to be supplemented to the humidifying cup is reduced, the use experience of a user is greatly improved, the humidity of pressurized air entering the adsorption barrel is greatly reduced, the phenomenon that an adsorbent is agglomerated due to humidification is improved, the service life of the adsorption barrel is prolonged, and the use cost of the user is reduced.

The invention discloses a zero-carbon glass kiln process. A system required by the process comprises a photovoltaic power generation device, an air separation device, a water electrolysis hydrogen production device, a mixer, a methanation device, a waste heat boiler I, a reforming device, a glass kiln, a waste heat boiler II and a dust removal and desulfurization device. Green oxygen, green nitrogen and green hydrogen are produced through green electricity driving; the flue gas of the glass kiln is cyclically enriched into high-concentration carbon dioxide (95.0 v% or above), the high-concentration carbon dioxide and green hydrogen are subjected to a methanation reaction to produce methane, and the methane, the carbon dioxide and water vapor are subjected to a reforming reaction to produce carbon monoxide and hydrogen; carbon monoxide and hydrogen are used as fuel of the glass kiln, green oxygen and carbon dioxide are mixed to form carbon-based oxygen-enriched combustion which is used as a combustion improver of the glass kiln, carbon-based oxygen-enriched combustion of the glass kiln is carried out, and redundant carbon dioxide is sold. According to the invention, the purposes of greenness, energy conservation, almost no nitrogen oxide and zero carbon are realized.

The invention relates to the technical field of crushing equipment, and discloses a lucid ganoderma crusher which comprises a base which serves as a basic component of the whole device and is used for assembling and bearing all treatment mechanisms and subordinate structural components of the treatment mechanisms. The treatment barrel is arranged in the middle of the top end of the base and is used for collecting and treating the lucid ganoderma. By adding and arranging the pretreatment mechanism, the mechanism pretreats the lucid ganoderma before crushing treatment by adopting high-temperature steam, on one hand, the high temperature of the steam can enable biological macromolecules such as microorganisms and nucleic acid on the surface and in the lucid ganoderma to be denatured, so that the biological macromolecules lose activity, the sterilization and disinfection effects are achieved, and the product quality and safety are improved; and on the other hand, the moisture and heat effect of the steam can soften and expand pectin, cellulose and other substances in cell walls and intercellular substances of the ganoderma lucidum, so that the texture of the ganoderma lucidum becomes softer, and the unnecessary material loss in the crushing process is reduced.

The invention discloses argon recovery equipment with the high extraction rate and a working method thereof.The argon recovery equipment with the high extraction rate comprises an argon extraction unit, the argon extraction unit comprises a pure argon pipe set, a first valve set and an argon extraction mechanism, and the pure argon pipe set comprises a first treatment pipe set and a second treatment pipe set; the first treatment pipe group comprises a first material receiving pipe, a second material receiving pipe and a liquid nitrogen connecting pipe, the second treatment pipe group comprises a first dirty argon guide pipe, a dirty liquid argon guide pipe, two backflow pipes, a second dirty argon guide pipe and a supplementing pipeline, and the first valve group comprises a feeding throttling valve and a first liquid nitrogen throttling valve. The argon extraction mechanism comprises a crude liquid argon treatment component and a dirty argon treatment component, the crude liquid argon treatment component comprises a pure argon tower and a nitrogen reboiler, the dirty argon treatment component comprises a nitrogen evaporator and a re-extraction assembly, and the re-extraction assembly comprises an argon synergistic tower. Compared with a common recovery mode, the treatment efficiency is high, the extraction rate of argon reaches 98% or above, and waste of argon resources is reduced.

The present invention belongs to the technical field of coking production, and in particular relates to a coke oven heating system adopting oxygen-enriched combustion. The coke oven heating system is characterized by comprising an oxygen producing unit, a coke oven heating unit, a flue gas treatment unit and a heat recovery unit, wherein an oxygen-deficient outlet of the oxygen producing unit is connected to the heat recovery unit, an oxygen-enriched outlet of the oxygen producing unit is connected to the coke oven heating unit, and a flue gas outlet of the coke oven heating unit is in communication with the flue gas treatment unit; the coke oven heating unit is connected to a fuel gas pipeline; and a return pipeline is further provided at a flue gas outlet of the coke oven heating unit and is connected to an air inlet of the oxygen producing unit. The present invention has the following beneficial effects: in the coke oven heating system, oxygen-enriched gas is used as the combustion-supporting gas of a coke oven, and main components of waste gas after combustion are carbon dioxide and water vapor which are both polar triatomic molecules having a relatively strong radiation capability, such that the radiation intensity in a combustion chamber of the coke oven can be increased, the radiation heat transfer efficiency in the combustion chamber is improved, and the coking time is shortened.

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.

High entropy alloy catalysts may be used for production of hydrogen. An example method of hydrogen production may include: introducing a hydrocarbon to a reactor, wherein the reactor contains therein a catalyst, wherein the reactor is substantially absent of oxygen and water, wherein the catalyst comprises a high entropy alloy and a catalyst support, wherein the catalyst is present in a form of a first plurality of particles, wherein the first plurality of particles is submicron-sized, wherein the high entropy alloy has an entropy, S, such that S≥12.47 J K−1 mol−1, and wherein the high entropy alloy comprises at least five of: iron, cobalt, manganese, nickel, molybdenum, copper, zinc, titanium, chromium, vanadium, aluminum, gallium, ruthenium, rhodium, palladium, silver, indium, tungsten, rhenium, iridium, platinum, gold, and bismuth; and reacting the hydrocarbon over the catalyst to produce solid carbon and hydrogen gas.

According to the helium purification treatment system and method, corresponding feature information is generated by detecting chemical components of to-be-purified gas in a first gas storage device, and one preset control strategy having a mapping relation with the feature information is determined from at least two preset control strategies to serve as a feature control strategy; the characteristic control strategy is a process control instruction set corresponding to the gas treatment demand condition of the to-be-purified gas, and the purification process of helium is controlled based on the characteristic control strategy, so that a proper process can be configured according to different to-be-purified gases input each time. The helium purification treatment system and the helium purification treatment method are high in helium purification efficiency.

The nitrogen making device comprises a box body, a nitrogen making assembly, a mounting support, a fresh-keeping drawer and a nitrogen making assembly, the nitrogen making assembly and the mounting support are mounted on the box body, the nitrogen making assembly comprises an air pump and a molecular sieve, and the air pump communicates with the molecular sieve and is used for providing compressed air for the molecular sieve; the mounting bracket is used for connecting a refrigeration liner of the refrigerator; the fresh-keeping drawer is slidably connected to the mounting support, a fresh-keeping chamber can be defined between the fresh-keeping drawer and the box body, and the fresh-keeping chamber communicates with the nitrogen outlet of the molecular sieve. In this way, modular design of the nitrogen making device in the refrigerator can be achieved, the structure of the nitrogen making device can be simplified, the production efficiency of the nitrogen making device and the assembling efficiency of the nitrogen making device in the refrigerator are improved, and the effect of reducing cost is achieved; in addition, leakage points during operation of the nitrogen making device can be reduced, vibration transmission to the refrigeration inner container is weakened, and the safety and reliability of the nitrogen making device and the refrigeration inner container of the refrigerator after long-term use are improved.

The invention belongs to the technical field of helium extraction, and particularly relates to a method for extracting high-purity helium from BOG (Boil Off Gas), which comprises the following steps: separating methane and nitrogen in BOG gas through a low-temperature crude extraction process to obtain crude helium; oxygen is added into the crude helium, then heating is performed, hydrogen and a small amount of methane in the crude helium react with the oxygen respectively under the action of a catalyst, the reacted gas is dried and adsorbed, and dehydrogenated crude helium is obtained; carrying out a low-temperature condensation process on the dehydrogenated crude helium to liquefy and remove nitrogen and a small amount of oxygen in the dehydrogenated crude helium to obtain refined helium; nitrogen and oxygen are removed from the refined helium through a low-temperature adsorption process to obtain high-purity helium, liquid nitrogen is adopted as a cold source in the low-temperature adsorption process, and when the liquid nitrogen is vaporized, the vaporized nitrogen is discharged through vacuumizing treatment. The pressure in the liquid nitrogen storage tank is smaller than 1 KPa, the vaporization rate of the liquid nitrogen is higher, more heat is absorbed, the adsorption efficiency of the second adsorber is improved, and consumption of the liquid nitrogen is reduced.

The application relates to the technical field of film materials, in particular to a mixed matrix membrane and a preparation method and application thereof. Toluene is added into a viscous polyamine acid solution, the temperature is increased to 200-250 DEG C, and stirring reaction is carried out for 5-8 hours, then the precipitate is obtained through centrifugation, the precipitate is washed with methanol for 3-5 times, and the product COOH-PI is obtained through drying; zinc nitrate hexahydrate and 2-methyl imidazole are dissolved in methanol, stirring reaction is carried out at room temperature for 3-8 hours, then the product is taken out and centrifuged, the product is washed with anhydrous methanol for 3-5 times, and ZIF-8 is obtained through drying; NH2-ZIF-8 is synthesized by using the same method; COOH-PI is added into DMF and stirred to obtain a PI solution, ZIF-8 and NH2-ZIF-8 are respectively added into DMF, and MOF suspension is obtained through ultrasonic treatment for 2-5 hours, then the MOF suspension is added into the PI solution, stirring is carried out at room temperature for 24-36 hours, the casting solution obtained is poured into a flat and clean glass plate, heating is carried out at 60-65 DEG C for 24-48 hours, then the formed membrane is dried to obtain the mixed matrix membrane. The preparation condition of the mixed matrix membrane is mild, the stability of the membrane is obviously improved, and the mixed matrix membrane has high selective permeability to helium.

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.

A method of treating a gas stream that includes: performing a first pressure swing adsorption (PSA) process generating a first H2-product gas and a first PSA tail gas from a first feed gas, the first PSA tail gas including a residual H2 and CO2; separating CO2 from the first PSA tail gas using a CO2 selective membrane, generating a CO2-rich permeate gas and a CO2-lean rejected gas; performing a second PSA process generating a second H2-product gas and a second PSA tail gas from a second feed gas, the second PSA tail gas including another residual H2; mixing the CO2-lean rejected gas and the second PSA tail gas to generate a mixed tail gas; and separating the residual H2 and the another residual H2 from the mixed tail gas using an H2 selective membrane, generating a recovered H2 permeate gas and a final rejected gas.

A device and a method for producing hydrogen and byproduct oxygen by using green electricity electrolyzed water are provided. The device comprises an oxygen purifying system, a heat exchange system, an air separation compression and expansion system, an air separation rectification system and a liquid oxygen storage system. The method comprises the following steps: first, purifying oxygen prepared by electrolyzing water by green electricity to remove impurities such as hydrogen, carbon monoxide, carbon dioxide and water in the oxygen, then feeding the pure oxygen into the heat exchange system, performing heat exchange liquefaction to obtain liquid oxygen, coupling the liquid oxygen generated by rectification of the air separation rectification system, and obtaining pressurized oxygen through the heat exchange system and the air separation compression and expansion system.

The invention relates to the technical field of oxygen preparation equipment, in particular to a medical molecular sieve oxygen generator which comprises a gas inlet pipeline, an impurity removal module, a four-way valve, a molecular sieve tower, a nitrogen discharge end, a spiral temperature conducting ring, an effect increasing assembly, a temperature control box, a semiconductor chilling plate, an adsorption mechanism, an adsorption box, an adsorption guide frame, an adsorption plate, a heating electrode, a ventilation worm wheel and an oxygen storage tower. At the cost of sacrificing the service life of the molecular sieve, the medical oxygen can be continuously provided for the patient within a period of time; when the spiral temperature conducting ring is electrified and activated, the control system immediately starts an alarm, so that medical staff can find that the oxygen production capacity of the molecular sieve is reduced and the molecular sieve needs to be replaced at the first time, and in the replacement process, a patient can obtain temporary oxygen supply by means of oxygen temporarily stored in the oxygen storage tower and can be replaced by the medical staff after the molecular sieve is replaced. And stable medical oxygen supply can be continuously obtained.

In a process in which ammonia is cracked to form a hydrogen gas product and an offgas comprising nitrogen gas, residual hydrogen gas and residual ammonia gas, residual ammonia is recovered from the offgas from the hydrogen recovery process by partial condensation and phase separation, and hydrogen is recovered from the resultant ammonia-lean offgas by partial condensation and phase separation. The recovered ammonia may be recycled the cracking process and the recovered hydrogen may be recycled to the hydrogen recovery process to improve hydrogen recovery from the cracked gas. Overall hydrogen recovery from the ammonia may thereby be increased to over 99%.

A methanol plant is provided in which a first feed comprising CO2 and a second feed comprising H2 are provided, the combined feed is shifted in a CO2 shift unit so as to provide a first synthesis gas stream. Water is removed in a water removal unit, to provide a second synthesis gas stream. A methanol synthesis section receives the second synthesis gas stream, and provides a product stream comprising methanol. A process for producing a product stream comprising methanol, and a process for upgrading a methanol plant are also provided.

The invention provides a molecular sieve quick-release assembly type oxygen generator, which belongs to the field of oxygen generators, and comprises an oxygen generator main body and a molecular sieve module, one side of the oxygen generator main body is provided with a quick-release butt joint port, an air inlet adapter, an oxygen adapter and a guide wedging surface are integrally arranged at the position, close to the top, of the quick-release butt joint port, and the air inlet adapter, the oxygen adapter and the guide wedging surface are arranged outside the surface; a molecular sieve gas inlet connector, a molecular sieve oxygen connector and a guide matching surface are arranged at the position, close to the top, of the molecular sieve module, the molecular sieve gas inlet connector is correspondingly inserted into the gas inlet adapter, and the molecular sieve oxygen connector is correspondingly inserted into the oxygen adapter; the molecular sieve module is fitted and guided by the guide matching surface and the guide wedging surface along the insertion direction to be assembled on the quick-release butt joint port of the oxygen generator main body, the molecular sieve is modularized, and the quick-release port is designed, so that the molecular sieve of the traditional oxygen generator is more convenient and efficient to replace.

A method of recycling helium from a waste gas generated in a semiconductor process includes forming a first treatment gas by treating helium-containing waste gas emitted from a semiconductor process facility by using a scrubber module, transporting the first treatment gas to a purification facility, forming a first helium gas with a first purity by fractionating the first treatment gas in the purification facility, forming a second helium gas with a second purity by treating the first helium gas by using a back-end purification module in the purification facility, and providing the second helium gas to the semiconductor process facility.