Ambient air contains 21% oxygen, 78% nitrogen, 0.9% argon and 0.1% rare gases. The PSA process is a static separation of air gases via a specific molecular sieve designed to adsorb nitrogen under pressure, to produce oxygen-enriched air composed of 93% oxygen and above.
The oxygen generator is mainly composed of 2 separation vessels filled with molecular sieve adsorbers (zeolites), one complete pneumatic system (valves, filters, pressure regulator...) monitored by an automatic device, and an oxygen tank.
PSA process 5 main stages
- 1. Compressed air (78% nitrogen, 21% oxygen, < 1% argon) is filtered, degreased and dried and the production pressure is automatically regulated.
- 2. Air passes through the molecular sieves where nitrogen is adsorbed by the zeolite, increasing oxygen concentration up to 95%.
- 3. Out of the molecular sieve, the oxygen produced is sent through the buffer tank via a mutifunction block. Nitrogen is released via a silent escape and forced back outside.
- 4.Part of the oxygen produced is used to help the nitrogen desorption of one vessel while the other ensures oxygen production (and vice versa).
- 5. An automatic and pneumatic vessels balance system ensure a continuous oxygen flow.