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The principle of psa oxygen generator and its application in industry

  • 2021-05-26

The principle of psa oxygen generator and its application in industry

1. The pressure swing adsorption oxygen generation system is an on-site gas supply equipment that uses pressure swing adsorption technology and special adsorbents to enrich the oxygen in the air at room temperature. The pressure swing adsorption oxygen generation system is a new type of high-tech equipment. It has the advantages of low equipment cost, small size, light weight, simple operation, convenient maintenance, low operating cost, fast on-site oxygen generation, convenient switching, and no pollution. Oxygen can be supplied by connecting the power supply. It can be widely used in petrochemical industry, electric furnace steelmaking, glass production, papermaking, ozone production, aquaculture, aerospace, medical care and other industries and fields. The equipment is stable, safe and reliable. Favor of the majority of users. Our company has a dedicated gas field application research team, with a wide range of products.
2. The pressure swing adsorption oxygen generator is an automatic equipment that uses zeolite molecular sieve as the adsorbent and uses the principle of pressure adsorption and decompression desorption to adsorb and release oxygen from the air, thereby separating oxygen. Zeolite molecular sieve is a kind of spherical granular adsorbent with micropores on the surface and inside, which is processed by a special pore type treatment process, and it is white. Its pore type characteristics enable it to realize the kinetic separation of O2 and N2. The separation of O2 and N2 by zeolite molecular sieve is based on the small difference in the dynamic diameter of these two gases. N2 molecules have a faster diffusion rate in the micropores of zeolite molecular sieve, and O2 molecules have a slower diffusion rate. The diffusion of water and CO2 in compressed air is not much different from that of nitrogen. The final enrichment from the adsorption tower is oxygen molecules.

3. Application areas, electric furnace steelmaking: decarburization, oxygen-assisted combustion heating, foam slag, metallurgical control and subsequent heating. Wastewater treatment: oxygen-enriched aeration of activated sludge, aeration in pools and ozone sterilization. Glass melting: Oxygen assists combustion and dissolution, cutting, increasing glass output and extending furnace life. Pulp bleaching and papermaking: Chlorine bleaching is transformed into oxygen-rich bleaching, providing cheap oxygen and sewage treatment. Non-ferrous metal smelting: smelting steel, zinc, nickel, lead, etc. requires oxygen enrichment, and PSA oxygen generators are gradually replacing cryogenic oxygen generators. Field cutting construction: oxygen enrichment for field steel pipe and steel plate cutting, mobile or small oxygen generators can meet the requirements. Oxygen for petrochemical and chemical industry: The oxygen reaction in the petrochemical and chemical process uses oxygen-rich instead of air to carry out the oxidation reaction, which can increase the reaction speed and the output of chemical products. Ore processing: used in gold and other production processes to increase the extraction rate of precious metals. Aquaculture: Oxygen-enriched aeration can increase the dissolved oxygen in the water, greatly increase the output of fish, and can provide oxygen for live fish transportation and intensive fish farming. Fermentation: Oxygen-enriched instead of air provides oxygen for aerobic fermentation, which can greatly improve the efficiency. Drinking water: Provides oxygen to the ozone generator and auto-oxygen sterilizes.
4. Process flow: After compressed by the air compressor, the air enters the air storage tank after dust removal, oil removal, and drying, and enters the left adsorption tower through the air inlet valve and the left inlet valve. The tower pressure increases and the compressed air enters the air storage tank. The nitrogen molecules are adsorbed by the zeolite molecular sieve, and the unadsorbed oxygen passes through the adsorption bed, and enters the oxygen storage tank through the left gas production valve and oxygen gas production valve. This process is called left suction and lasts for tens of seconds. After the left suction process is over, the left adsorption tower and the right adsorption tower are connected through a pressure equalizing valve to balance the pressure of the two towers. This process is called pressure equalization, and the duration is 3 to 5 seconds. After the pressure equalization is over, the compressed air enters the right adsorption tower through the air intake valve and the right intake valve. The nitrogen molecules in the compressed air are adsorbed by the zeolite molecular sieve, and the enriched oxygen enters the oxygen storage through the right gas production valve and oxygen gas production valve. Tank, this process is called right suction, and the duration is tens of seconds. At the same time, the oxygen adsorbed by the zeolite molecular sieve in the left adsorption tower is released back to the atmosphere through the left exhaust valve. This process is called desorption. On the contrary, when the left tower is adsorbing, the right tower is also desorbing at the same time. In order to completely discharge the nitrogen released from the molecular sieve to the atmosphere, the oxygen gas passes through a normally open back-purge valve to purge the desorption adsorption tower, and the nitrogen in the tower is blown out of the adsorption tower. This process is called backflushing, and it is carried out simultaneously with desorption. After the right suction is finished, it enters the pressure equalization process, then switches to the left suction process, and continues to continue, so as to continuously produce high-purity product oxygen.

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