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The atmospheric air mainly consists of Oxygen and Nitrogen gases, together with small quantities of water vapour, carbon dioxide and other rare gases such as argon helium etc. Oxygen and Nitrogen from the air can be separated due to the difference in boiling points by distilling them through a fractionating column.
Free atmospheric air is sucked in by a multi stage compressor through a filter and compressed to the working pressure. The compressed air is then passed through a pre-cooling system, dust filters, moisture separators and then to the Molecular Sieve Battery for removing traces of carbon dioxide and moisture from the air. This purified air then passes through the first Heat Exchanger, where it is cooled by the out going Nitrogen and Oxygen. Part of this cooled air then passes through an expansion engine and the other part through the 2nd heat exchanger. Both the expansion engine and 2nd heat exchanger help in cooling down the air further, which is finally released to the bottom of the column through an expansion valve. The air becomes liquid at this stage.
The column is divided into two parts Lower column and Upper column. In between the lower and upper columns there is a condenser which acts as a reflux for the lower column and as a re-boiler for the upper column. The liquid air at the bottom of lower column separates through the trays of the column to give crude Oxygen at the bottom and 97% pure Nitrogen at the top. Crude Oxygen termed as rich liquid is then expanded through an expansion valve from the lower column to the middle of the upper column. Crude Nitrogen termed as poor liquid is expanded through another expansion valve from the top of the lower column to the top of the upper column. Due to difference in the boiling points, the pure Nitrogen boils over and accumulates at the top of the upper column and Oxygen (which has a higher boiling point than Nitrogen) accumulates at the bottom of the upper column.
Both Nitrogen and Oxygen are removed by separate pipelines through heat exchangers, for cooling the incoming air, to the filling manifolds. Both Oxygen and Nitrogen can be filled directly into cylinders through separate LOX and LIN Pumps. No Storage Tanks are required.
For more details visit www.sanghioxygen.com
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