PSA Nitrogen Generator full name: Pressure Swing Adsorption (PSA).PSA is a new gas separation technology, which has been developed rapidly in foreign countries since the late 1960s and early 1970s. Its principle is to separate the gas mixture by the difference of the "adsorption" performance of different gas molecules by molecular sieve. It takes air as raw material.The nitrogen and oxygen in the air are separated by the selective adsorption of nitrogen and oxygen with a high efficiency and high selection of solid adsorbent.
At present, carbon molecular sieves and zeolite molecular sieves are used more in the field of nitrogen and oxygen production.The separation of oxygen and nitrogen by molecular sieve is mainly based on the different diffusion rates of the two gases on the surface of molecular sieve. Carbon molecular sieve is a carbon-based adsorbent with some characteristics of activated carbon and molecular sieve.Carbon molecular sieves are composed of very small micropores with pore sizes ranging from 0.3nm to 1nm.The smaller diameter of the gas (oxygen) diffuses faster and more into the solid phase of the molecular sieve, so that nitrogen enrichment can be obtained in the gas phase.After a period of time, molecular sieve on oxygen adsorption balance, according to the carbon molecular sieve under different pressure on the adsorption of different gas adsorption characteristics, reduce the pressure to remove the carbon molecular sieve on oxygen adsorption, this process is called regeneration.PSA usually uses two towers in parallel, alternately pressurized adsorption and decompression regeneration to obtain a continuous flow of nitrogen.
With air as raw material, with carbon molecular sieve as adsorbent, the use of pressure change adsorption principle, the use of carbon molecular sieve on oxygen and nitrogen selective adsorption and separation of nitrogen and oxygen method, commonly known as PSA nitrogen.This method is a new technology of nitrogen production which developed rapidly in 1970s.Compared with the traditional method of nitrogen, it has simple process, high degree of automation, produce gas quickly (15 ~ 30 minutes), low energy consumption, product purity can be adjusted according to user needs in a wide range, convenient operation and maintenance, low operating cost, good adaptability device etc., in 1000 nm3 / h the following competitive in nitrogen making equipment,PSA is more and more popular among medium and small nitrogen users, and has become the choice method for medium and small nitrogen users.
1. Why choose PSA nitrogen generator ?
High nitrogen purity
PSA nitrogen generator plants allow production of high-purity nitrogen from air, which membrane systems are unable to provide - up to 99.9995% nitrogen.The nitrogen generators use CMS (carbon molecular sieve) technology to produce a continuous supply of ultra high purity nitrogen and are available with internal compressors or without.
Low operating costs
By substitution of out-of-date air separation plants nitrogen production savings largely exceed 50%.
The net cost of nitrogen produced by nitrogen generators is significantly less than the cost of bottled or liquefied nitrogen.
Nitrogen Generators Create Less Impact on the Environment
Generating nitrogen gas is a sustainable, environmentally friendly and energy efficient approach to providing pure, clean, dry nitrogen gas. Compared to the energy needed for a cryogenic air separation plant and the energy needed to transport the liquid nitrogen from the plant to the facility, generated nitrogen consumes less energy and creates far fewer greenhouse gases.
Process flow and equipment introduction of PSA nitrogen making machine
1. Brief introduction to the technological processNitrogen Generator
Air through the air filter to remove dust and mechanical impurities into the air compressor, compressed to the required pressure, after strict oil removal, water removal, dust removal and purification treatment, the output of clean compressed air, the purpose is to ensure the service life of the molecular sieve adsorption tower.There are two adsorption towers with carbon molecular sieve. One tower is operated while the other tower is decompressed and desorbed.Clean air into the working adsorption tower, through the molecular sieve oxygen, carbon dioxide and water are absorbed by it, flow to the outlet end of the gas is nitrogen and trace argon and oxygen.Another tower (desorption tower) allows adsorbed oxygen, carbon dioxide and water to escape from the pores of the molecular sieve and discharge into the atmosphere.In this way, the two towers take turns to complete nitrogen and oxygen separation and continuously output nitrogen, as shown in Fig. 2.The purity of nitrogen produced by pressure change adsorption is 95%-99.9%. If higher purity nitrogen is needed, nitrogen purification equipment should be added.Psa nitrogen making machine output 95% 99.9% of the nitrogen into the nitrogen purification equipment, at the same time through the flowmeter to add just the right amount of hydrogen gas, hydrogen and nitrogen in the purification equipment of deoxidization tower of trace oxygen in catalytic reaction, and then by water to remove oxygen condenser cooling, in addition to water, water separator, and then through the depth of the dryer drying (two adsorption drying tower used interchangeably:One is adsorbed and dried for water removal, the other is heated for desorption and drainage) to obtain high purity nitrogen. At this time, the purity of nitrogen can reach 99.9995%. At present, the maximum production capacity of nitrogen production by pressure swapping adsorption in China is 3000M3N /h.
Provide maximum business value
* Molecular sieve filling and compacting, adopt the professional way to complete in a professional context, higher density, higher efficiency
* Design optimization, process and structure of the system, to play the greatest potential, higher reliability
* Special valve by one million times, frequent switching fault free, and stable operation of security system
* Nitrogen can automatically record, easy to locate any work time, work state
* System design more reasonable, more secure, more reliable.
* Automatic operation, the system, the whole process can be achieved unattended.
Which nitrogen generator should I choose?
Different parameters are essential for your choice of nitrogen generator
• How big is your consumption?
• Is your consumption variable?
• Which pressure is required?
• What purity/capacity is required?
• Do you already have a compressed air system?
Why choose LDH GAS?
*Be your own supplier, customized.
*Mobile and flexible sloutions
*Produce gas when and where you want
*Save your installation cost
*minimum maintence .fully automatic operation
*Only quality compenents are used.
After Sale Service & Support
LDH GAS offers a range of services to help you maximize your benefits. For maximum convenience, we offer a fixed price service agreement based on operation time or calendar
time. Of course, all customers are welcome to call us at any time. We are always more than willing to assist you.
1) Consultancy
Help for self-help, exchange of experience and individual support.
If you have questions on plant operation or need somebody for troubleshooting, we give you advice either on the phone or in writing. The direct contact with you is very important for us as it is the basis for a permanent cooperation as partners to the benefit of both sides.
2) Commissioning
Systematic from final acceptance of erection to approval of proper operation and guaranteed features. This includes extensive operational tests, professional filling with adsorbents and catalysts, proper start-up, optimal setting of operating parameters and check of all safety functions. At the same time we train your operating personnel on functions and operation of the plant.
3) Spare Parts Service
Worldwide, quick and low-priced over the complete lifetime of your plant. The distinct tagging of all plant components delivered by us enables us to identify clearly the spare parts requested by you. We supply you with products designed for a long life and economic efficiency.
For modifications and extensions we look for the most optimal and economic solution for your individual purpose.
4) Maintenance/Revisions
Regular inspection and maintenance ensures permanent operation, avoids damage and prevents unexpected breakdowns. In the course of maintenance/revision works we check all relevant components for function and condition, exchange defect, used and worn parts and afterwards optimally eadjust your plant to the given operating conditions. Depending on the plant size and
scope of work, our service range comprises also a detailed scheduling of revisions as well as coordination and supervision of contractors. As a matter of course we supply maintenance documentation in form of reports and spare part recommendations, and we coordinate our schedules according to your requirements.
5) Training
Know-how for your personnel.
Operation, maintenance and repair, electric measuring and control equipment or process engineering - we offer you specific training by our experts. Whether on site working with theplant itself, or on our permises, we concentrate on your questions and problems.
Metallurgy, metal processing industry
Used for annealing protective gas, sintering protective gas, nitriding treatment, furnace cleaning and purging gas, etc. Widely used in metal heat treatment, powder metallurgy, magnetic materials, copper processing, wire mesh, galvanized line, semiconductor, powder reduction and other fields. Some of these industries require nitrogen with purity greater than 99.5%, while others require high-quality nitrogen with purity greater than 99.9995% and dew point below -65ºC.
Metal production and processing manufacturing steel, iron, copper, aluminum products annealing, carbonization, high temperature furnace protection, metal components of low temperature assembly and plasma cutting.
Metal heat treatment in bright annealing, bright quenching and other heat treatment process, to provide protection gas and safety gas for industrial furnace, in order to prevent the oxidation of products.
Nitrogen source for bright quenching, bright annealing, nitriding, nitrocarburizing, soft carbonization heat treatment, welding and powder metallurgy sintering process, etc
Nitrogen in metal heat treatment applications, used in alloy steel, high carbon steel annealing protective atmosphere, metal powder sintering protective atmosphere, nitridation treatment, furnace cleaning and purging gas, LDH gas to provide high-quality nitrogen, purity is greater than 99.9995%, dew point is less than -65 ºC.
The heat treatment of nitrogen-based atmosphere based on nitrogen odor is a new technology and technology for energy saving, safety, no pollution to environment and full use of natural resources. It has been shown that almost all heat treatment processes, including quenching, annealing, carburizing, carbonitriding, soft nitriding and recarburizing, can be carried out in a nitrogen-based atmosphere, and the quality of the metal parts treated is comparable to that of the traditional endothermic atmosphere treatment.
Aluminum processing industry aluminum products, aluminum profile processing, aluminum rolling and other gas protection.
Powder metallurgy powder sintering, nitrogen protection in sintering of magnetic materials.
Synthetic fiber is filled with nitrogen and pressed, and wire drawn to prevent oxidation.
Nitrogen - filled lead - free soldering for reflow soldering and wave soldering.
Metallurgical industry: continuous casting, rolling, steel annealing protection gas; Bof top and bottom composite blowing nitrogen steel-making, bof steel-making sealing, blast furnace top sealing, blast furnace pulverized coal blowing gas etc.
Nitrogen is mainly used as a protective gas in the application of metal deep processing in steel, such as steel rolling, galvanizing, chromium plating, continuous casting, etc. to use nitrogen as protective gas, and nitrogen purity requirements of more than 99.99%, LDH gas to provide gas solution, nitrogen purity can reach 99.9995%.
Medium and high voltage cable generation needs nitrogen gas
Inert gas crosslinking adopts polyethylene insulating material added with peroxide compound crosslinking agent. After extrusion of conductor shielding layer -- insulating layer -- insulating shielding layer through three layers of co-extrusion, the crosslinking process is completed continuously and uniformly through sealed crosslinking pipe filled with high-temperature and high-pressure nitrogen. The heat transfer media is nitrogen (inert gas), and the electrical properties of xLPE are excellent, and the production range can reach 500KV.
2) Chemical industry, new materials industry
Mainly used for chemical raw gas, pipeline purging, atmosphere replacement, protective atmosphere, product transportation and so on. Mainly used in chemical industry, spandex, rubber, plastics, tires, polyurethane, biotechnology, intermediates and other industries. Many chemical industries do not require high purity of nitrogen, many purity is more than 98% can be used. Acrylic oxidation explosion-proof, float glass process, protection
Chemical industry in the chemical process to create anaerobic atmosphere to improve the safety of production process, fluid transmission power source
Replacement, cleaning, sealing, leak detection, dry coke quenching protection gas; Catalyst regeneration, petroleum fractionation, chemical fiber production, etc
The petroleum industry improves petroleum processing and refining technology, oil storage and pressurization of oil and gas Wells, pipeline cleaning and purging, solvent recovery, etc.
Nitrogen purification for storage, container, FCC tower, pipeline, etc. Pipeline system pressure leakage test, etc
Offshore oil development; Gas cover of platform and inerting of storage tank and container in offshore oil exploitation
Glass manufacturing prevents surface oxidation and furnace cooling in the glass manufacturing process.
Float glass production process of gas protection, tin tank oxidation. Protective gas in float glass production
Float glass industry in the float glass production process, floating medium in tin tank under high temperature oxidation, increase tin loss, and make the glass surface produce a variety of defects, so it is necessary to pass into the tin tank protective gas nitrogen, while adding 5% to 10% hydrogen, tin tank to form a reducing atmosphere, so that tin oxide re reduction into tin. LDH gas through the use of ammonia decomposition hydrogen nitrogen mixture instead of hydrogen production by water electrolysis, and more than in the practical application of float glass production line, the low energy consumption, simple operation, safety explosive-proof grade of relatively low protective gas production equipment in the float glass production line, as the production of low, medium, high-grade float glass, lowering the cost of hydrogen has carried on the beneficial exploration.
Rubber vulcanization, tire crushing, etc. High pressure forming anti oxidation, wire and cable gas protection.
Chemical fertilizer industry: nitrogen fertilizer raw materials; Gas for displacement, sealing, washing and protection of catalyst
Plastics industry: pneumatic transmission of plastic particles; Oxidation prevention in plastic production and storage
Rubber industry: rubber packaging, storage; Tire production, etc.
Application in chemical fiber production process: in chemical fiber production, high purity nitrogen is often used as a protective gas to prevent chemical fiber products from being oxidized in production and affecting color. The higher the purity of nitrogen, the more beautiful the color of chemical fiber products.
3) Food and pharmaceutical industry
Mainly used in food packaging, food preservation, medicine packaging, medicine replacement gas, medicine delivery atmosphere. Normally, the nitrogen has to be treated with sterilization, dust removal and water removal to meet the special requirements of the industry. The food industry does not have high requirements for nitrogen, many of which are 98% or more pure. The pharmaceutical industry usually requires nitrogen with a purity of 99.9%. In the food industry, when the amount of nitrogen is small, it is commonly used to produce nitrogen by membrane separation, and when the amount is large, pressure swing adsorption is often used to produce nitrogen.
Scientific research and medical deep hypothermia and cryotherapy.
Medical and health pharmaceutical raw materials, nitrogen-filled packaging, transportation and Chinese herbal medicine moth-proof, anti-corrosion protection.
Beer beverage process gas, preservation, storage.
Pharmaceutical industry: nitrogen-filled storage and preservation of Traditional Chinese medicine (such as ginseng); Western medicine injection filled with nitrogen; Storage and container nitrogen filling; The air source of the pneumatic conveying of the medicine material
Medicinal nitrogen equipment (nitrogen purity 99.99%) is based on the recent years of professional research and development of pressure swing adsorption nitrogen machine experience, according to GMP specifications of the development of medicinal nitrogen machine, compared with cylinder nitrogen (or liquid nitrogen) in use, low operating cost, stable nitrogen purity, simple operation.
The food industry is used for food preservation and food storage, food drying and sterilization, food rapid freezing, etc.
Nitrogen-filled storage and preservation of fruits, vegetables and tea leaves is also a good method. This method can make fruits, vegetables, vegetable leaves and so on in the environment of high nitrogen and low oxygen, slow down the metabolism, as if into hibernation, restrain after ripe, so as to keep fresh for a long time. According to the test, nitrogen filled storage of apples, 8 months after the crisp, food preservation: grain, fruit, vegetables, such as nitrogen filled storage and preservation; Nitrogen-filled packaging for meat, cheese, mustard, tea and coffee; Filling nitrogen and discharging oxygen for fruit juice, raw oil and jam; Purification and covering of all kinds of bottles of wine
Nitrogen is used to make the grain in the state of dormancy and hypoxia, slow metabolism, can achieve good anti-insect, anti-mildew and anti-spoilage effect, the grain is not polluted.
The storage of rice, wheat, barley, corn and rice with nitrogen exhaust air can prevent insects from eating, fever and mildew, so as to ensure quality through the summer. This method is to close the grain with plastic cloth, first pumped into a low vacuum, and then filled with nitrogen purity of 98% or so, until the internal and external pressure balance. This can make the grain pile in the hypoxia, reduce the respiratory intensity of grain, inhibit the reproduction of microorganisms, borers in 36 hours due to hypoxia and all death. This method of reducing oxygen and killing insects can not only save a lot of cost (about 1% of the cost of using highly toxic drugs such as zinc phosphide fumigation), but also maintain the freshness and nutritional value of food, prevent bacterial infection and drug pollution.
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