PSA Oxygen Production Plant Working Principle

Industrial oxygen generator adopt zeolite molecular sieve as adsorbent and use the pressure adsorption, pressure desorption principle from the air adsorption and release the oxygen. Zeolite molecular sieve is a kind of spherical granular adsorbent with micropores on the surface and inside, and is white. Its pass characteristics enable it to achieve kinetic separation of O2 and N2. The separation effect of zeolite molecular sieve on O2 and N2 is based on the slight difference of kinetic diameters of the two gases. N2 molecule has a faster diffusion rate in the micropores of zeolite molecular sieve, while O2 molecule has a slower diffusion rate. The diffusion of water and CO2 in compressed air is not very different from that of nitrogen. What eventually comes out of the adsorption tower is oxygen molecules. Pressure swing adsorption oxygen production is the use of zeolite molecular sieve selection adsorption characteristics, the use of pressure adsorption, desorption cycle, the compressed air alternately into the adsorption tower to achieve air separation, so as to continuously produce oxygen.

1. Compressed air purification unit

The compressed air provided by the air compressor is first passed into the compressed air purification component, and the compressed air is first removed by the pipeline filter most of the oil, water and dust, and then further removed by the freeze dryer, the fine filter for oil removal and dust removal, and the ultra-fine filter is followed by deep purification. According to the system working condition, TCWY specially designed a set of compressed air degreaser to prevent possible trace oil penetration and provide adequate protection for molecular sieve. Carefully designed air purification components ensure the service life of the molecular sieve. Clean air treated by this assembly can be used for instrument air.

2. Air storage tank

The role of the air storage tank is: reduce the airflow pulsation, play a buffer role; Thus, the pressure fluctuation of the system is reduced, so that the compressed air passes through the compressed air purification component smoothly, so as to fully remove the oil and water impurities, and reduce the load of the subsequent PSA oxygen and nitrogen separation device. At the same time, when the adsorption tower is switched, it also provides a large amount of compressed air for the PSA oxygen and nitrogen separation device to rapidly increase the pressure in a short time, so that the pressure in the adsorption tower quickly rises to the working pressure, ensuring the reliable and stable operation of the equipment.

3. Oxygen and nitrogen separation device

The adsorption tower equipped with special molecular sieve has two, A and B. When the clean compressed air enters the inlet end of tower A and flows through the molecular sieve to the outlet end, N2 is adsorbed by it, and the product oxygen flows out from the outlet end of the adsorption tower. After a period of time, the molecular sieve in Tower A was saturated by adsorption. At this time, tower A automatically stops adsorption, compressed air flows into Tower B for nitrogen absorption and oxygen production, and the molecular sieve of Tower A is regenerated. The regeneration of molecular sieve is achieved by rapidly dropping the adsorption tower to atmospheric pressure to remove the adsorbed N2. The two towers are alternately adsorbed and regenerated to complete the separation of oxygen and nitrogen and the continuous output of oxygen. The above processes are controlled by a programmable logic controller (PLC). When the oxygen purity of the outlet end is set, the PLC program acts, the automatic vent valve is opened, and the unqualified oxygen is automatically emptied to ensure that the unqualified oxygen does not flow to the gas point. When the gas is venting, the noise is less than 75dBA by using a silencer.

4. Oxygen buffer tank

The oxygen buffer tank is used to balance the pressure and purity of the oxygen separated from the nitrogen oxygen separation system to ensure the stability of the continuous supply of oxygen. At the same time, after the work of the adsorption tower is switched, it will fill part of its own gas back to the adsorption tower, on the one hand to help the adsorption tower pressure, but also play a role in protecting the bed, and play a very important process assistance role in the working process of the equipment.


Post time: Aug-23-2023