Complete sets of air separation equipment has been built
2016-12-07
Air separation plant work process Description :
STEP 1 - Air Compression
The use of turbine-type air compressor, the compressor is oil-free compressor, the air pressure to 0.5MPa, to meet the needs of air distillation
STEP 2 - Air Pre-Cooling
Air pre-cooling system, the air at 100 ℃ down to 7 ℃, pre-cooling system equipment, including air cooling tower, water cooling towers, water pumps and refrigeration units
STEP 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 process air before the air enters Air Separation Unit.
STEP 4 - Separation of Liquid Air into Oxygen and Nitrogen in Air Separation Column
Oil free, moisture free and Carbon Dioxide free air enters into low pressure plate fin type Heat exchanger where the air is cooled below sub zero temperatures by air expansion process in the turbo expander. Due to the excellent thermal efficiency we can achieve a temperature difference delta t as low as 2 deg c at the warm end of these exchangers.
The air has to be cooled to sub zero temperatures for liquification & 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. Air gets liquefied when it enters the air separation column & gets separated into oxygen & nitrogen by the process of rectification.
Oxygen is available in gas or liquid form (as per requirement) at the outlet of the ASU at a purity of 99.6%. Nitrogen is also available at the outlet as a second product at purity of 99.99% upto 3ppm simultaneously without loss of oxygen product (or as specified).
STEP 5 – Product storage
For Gas: The final product in the form compressed Oxygen/Nitrogen goes to the high pressure oxygen cylinders at 1 50 bar or upto higher as required. OR for pipeline supply or captive consumption.
For Liquid: Liquid Oxygen / Nitrogen to fill in cryogenic liquid tanks.
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