Air contains 21% Oxygen, 78% Nitrogen, 0.9% Argon and 0.1% other trace gases. An Oxygen generator separates this oxygen from Compressed Air through a unique process called Pressure Swing Adsorption. (PSA).The Pressure Swing Adsorption process for the generation of enriched oxygen gas from ambient air utilises the ability of a synthetic Zeolite Molecular Sieve to absorb mainly nitrogen. While nitrogen concentrates in the pore system of the Zeolite, Oxygen Gas is produced as a product.

Oxygen generation plant’s use two vessels filled with Zeolite Molecular sieve as adsorbers. As Compressed Air passes up through one of the adsorbers, the molecular sieve selectively adsorbs the Nitrogen. This then allows the remaining Oxygen to pass on up through the adsorber and exit as a product gas. When the adsorber becomes saturated with Nitrogen the inlet airflow is switched to the second adsorber. The first adsorber is regenerated by desorbing nitrogen through depressurisation and purging it with some of the product oxygen. The cycle is then repeated and the pressure is continually swinging between a higher level at adsorption (Production) and a lower level at desorption (Regeneration).

The after desorption is blown by a blower and enters the adsorption vessel of the system after being filtered and removed mechanical impurities.

The adsorber is a double-vessel system, and its product is oxygen. Nitrogen, carbon dioxide and water vapor in the air are adsorbed, and a vacuum pump will be applied after saturated adsorption to ensure the adsorbents in the adsorption vessel are completely desorbed for regeneration. The double-vessel system ensures continuous oxygen generation through cyclic switch of the program control valve under the control of PLC Adsorption process.Oxygen is enriched at the top of the adsorption vessel, then enters an oxygen buffer tank to supply oxygen to the downstream. In this stage, oxygen is continuously supplied to the downstream from the oxygen buffer tank.