Our oxygen generators use the ambient air, mainly composed of nitrogen (N2, 78%), oxygen (O2, 21.8%), argon (Ar, 0.1%) and rare gases (0.1%), as unique raw material.The separation of the oxygen from the ambient air is achieved using the PSA (pressure swing adsorption) technology which is described below.
With this PSA technology, the oxygen produced can reach 96% oxygen, with the remainder composed primarily of argon. But on top of mastering the PSA concept, Oxyplus Technology owns a proprieteray know-how which enable us to manufacture oxygen generators producing oxygen purity at 99%, fulfilling in this way the most advanced standards of medical oxygen purity.
The oxygen generator consists of two large sieve beds, a valve assembly, air filters, main pressure regulator, and the product receiver tank. The oxygen produced by the generator flows into the receiver tank, where it can be withdrawn for use.
There are 5 main cycles during the PSA process :
1. Compressed air (78% nitrogen, 21% oxygen, < 1% argon) is passed through the air filters, which remove water and oil, and then through the air inlet regulator which reduces the gas to the operating pressure.
2. The air is directed to one of the two adsorber beds, where the nitrogen is adsorbed by the molecular sieve, thus increasing the oxygen purity of the resultant gas stream to approximately 95%.
3. This product flow comes out of the adsorber bed, through the product flow control needle valve and back pressure regulator, and into the product receiver.
4. A portion of the intermediate product produced is directed through the purge control needle valve. This oxygen is allowed to flow back through the other first stage adsorber sieve bed and out through the exhausted line. This action purges the adsorber bed of nitrogen, and prepares the bed for the next cycle. During the next cycle, the beds switch roles; the first bed is purged while the second bed produces intermediate product. The active bed will remain online until just prior to becoming saturated with nitrogen.
5. When the cycle is completed, the controller will equalise pressure between the beds, exhaust and purge the saturated bed, and pressurise the fresh adsorber bed. This allows a continuous flow of oxygen gas from the generator.