The various models of PSA nitrogen generation systems
offered by GCS generate nitrogen at purities ranging from
95 – 99.999%, with a max pressure drop of only 1 bar.
Various sizes are offered with flowrates ranging from 5cfm
to >200cfm in order to meet your specific nitrogen needs.
Compressed air is passed through a refrigerated air dryer
and a four-step filtration process for optimal performance
and lifespan of the PSA unit. An air buffer is incorporated
for smooth supply of compressed air, thus reducing
fluctuation of load demands at the air compressor. The
generator produces nitrogen with PSA (pressure swing
adsorption) technology, which is a time proven nitrogen
generation method. Nitrogen at the desired purity is
delivered to the nitrogen buffer tank for smooth supply at a
constant purity and flow rate. The nitrogen buffer tank is
maintained at certain pressure, and is adjustable to your
needs through a pressure regulator valve.
The principles of PSA nitrogen generation are adsorption
and diffusion. Each gas has a characteristic adsorption rate
that is adsorbed by the Carbon Molecular Sieve (CMS). The
CMS has a large surface area that is covered in micropores
and passageways. Since oxygen has a higher adsorption rate
than nitrogen, when compressed air flows through the
CMS, the nitrogen molecules are able to pass through this
large surface freely, while oxygen molecules are adsorbed to
After the CMS is saturated with oxygen, it is depressurized
to regenerate for the next cycle. We use two towers filled
with CMS to produce a continuous stream of nitrogen.
During depressurization, the nitrogen of lower purity is
transferred to the adjacent tower, which is called pressure
equalization. Pressure equalization is key to higher
efficiency and less energy consumption.