How Does a PSA Nitrogen Generator Work?

- May 09, 2019-

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PSA Nitrogen Generator

Pressure Swing Adsorption (PSA) is based on producing a constant stream of nitrogen that results from using compressed air. The PSA nitrogen generator working principal uses pretreated compressed air that is filtered through a carbon molecular sieve (CMS). Trace gasses, as well as oxygen, will ultimately be absorbed through the CMS. Nitrogen is then allowed to pass through. This process occurs in two towers which both contain a CMS.

At a specific time, the on-line tower will vent the contaminants. This is called the regenerative mode. Oxygen, which is made of smaller molecules, is separated from the nitrogen. The lining in the sieve will absorb the smaller oxygen molecules. The nitrogen molecules are too large to go through the CMS and ultimately emerge as the desired product.


PSA nitrogen work process


The pre-treated air first enters one adsorption vessel which is fully filled with carbon molecular sieve pellets which selectively remove oxygen and carbon dioxide from the compressed treated air resulting in a product stream of rich nitrogen. Then purified nitrogen is processed by the product delivery operation.

 When the oxygen capturing capacity of the first adsorption tower is diminishing, the feed flow processing valves will switch the feeding air to the second adsorption tower to perform the same process as in the first tower. The first adsorption tower is then depressurized rapidly and purged to remove the adsorbed oxygen and carbon dioxide. Then feed flow processing valves switch the feeding air back to the first adsorption tower and the cycle begins again.