What are oxygen generators?
Oxygen generators produce gaseous oxygen from compressed air on site and offer a cost-effective, reliable and safe alternative to traditional oxygen gas supplies such as cylinders or cryogenic liquid. Oxywise Oxygen Generators are available in several standard models with capacity ranging from 0,4 to 150 Nm3/hour at 93% purity. The design is made for round the clock 24/7 operation. Each generator is equipped with an automatic start and stop function, enabling the generator to start and stop automatically according to the consumption.
The oxygen and nitrogen generators are based on the PSA technology, also called Pressure Swing Adsorption or Separation by Pressurization Alternated, which consist to separate the air & gas from the ambient air, used as one raw material (air ambient contains 21 % oxygen, 78% nitrogen, 0.9 % argon and 0.1 % rare gases).
The gases are separated under the alternating pressurization of two tanks filled with molecular sieve ( zeolite for oxygen generator and activated carbon for nitrogen generator).
Pressure Swing Adsorption technique
Pressure Swing Adsorption (PSA) is the most commonly used non-cryogenic oxygen production process; most effective for small and medium capacities. The process operates by using two columns filled with adsorbent, a molecular sieve called Zeolite. Pre-treated compressed air enters the first column and follows up through the Zeolite. Nitrogen and some other gases are being trapped while the oxygen is allowed to flow through. When the active column is saturated, the air flow is directed to the second column. The first column depressurizes allowing nitrogen to be purged out to the atmosphere and completely regenerates. The process is repeated continuously, when one column is productive, the other regenerates and at the end of each cycle they switch roles. The generator produces constant flow of purified oxygen.
PSA over LMO
Separating various components from a mixture of gases is the main motive of a PSA oxygen plant.
These plants use a “clean technology” that absorbs nitrogen from the air and extracts oxygen for supply to specific facilities.
The Air Compressor compresses atmospheric air up to working pressure. After the dust particles are suspended, a coal tower absorbs traces of oil particles and other impurities.
An Air Tank then acts as an accumulator for the pressure swing adsorption cycle.
The PSA Generator which includes zeolites—used as commercial adsorbent—then separates oxygen and nitrogen from processed air.
These zeolites beds trap nitrogen molecules and allow the oxygen to stream through which later goes into an oxygen receiver that acts as an accumulator for further purification.
The generated oxygen can be supplied straight to the site of use through a dedicated pipeline or compressed to fill the cylinders.
PSA plants encapsulate the latest technologies in generation of medical grade oxygen at a fraction of the cost of the conventional Liquid Medical oxygen concept.Thus it is possible for hospitals to have oxygen on demand”without waiting for liquid medical oxygen supplies from a third party vendor.