Cylinder Filling Oxygen Nitrogen Plants (Low Pressure)

1. Compression Of Atmospheric Air By Air Compressor :
Air is compressed at a very pressure of 5-7 bar (kg/cm2). Air can be compressed at such low pressure by trouble free rotary compressor (Screw / Centrifugal Type advanced technology is employed in lieu of old bulky piston compressor)

2. Pre Cooling System
The second stage of the process uses a low pressure refrigerant for pre-cooling the processed air to temperature around 12 deg C before it enters the purifier.

3. Purification Of Air By Purifier
The air enters a purifier consisting of twin Molecular Sieve driers, working alternatively. The molecular sieves remove the carbon dioxide & moisture from the processed air before the air enters air separation unit.

4. Cooling Of Air By Turbo (Expander)
The air has to be cooled to sub zero temperatures for liquefaction & the cryogenic refrigeration & the cooling is provided by highly efficient turbo expander, which cools the air to temperature almost below -165 to-170 deg C.

5. Separation Of Liquid Air Into Oxygen And Nitrogen By Air Separation Column Oil free, moisture free and Carbon Dioxide free air enters into low pressure fin type Heat Exchanger where the air is cooled below sub zero temperatures by air expansion process in the turbo expander.