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BDM Oxygen Plant

The free atmospheric air is sucked in the nitrogen oxygen gas plants by a multi-stage air compressor through a filter and compressed to the working pressure. After each stage, intermediate coolers and water separators are provided. The compressed air then passed through the evaporation pre-cooler and then to the molecular sieve battery where the moisture and carbon di-oxide are removed from the process air. It then passes through the heat exchanger No.1 where it is cooled by the out-going waste nitrogen gas and product oxygen produced in the oxygen gas plants.

A part of this cold air then flows through an expansion machine and the balance through the 2nd heat exchanger. The ratio of the two air streams is controlled by an expansion valve, RI. Both these streams of air then unite in the medium pressure column where it partially liquefies.

The liquid air (rich liquid) then passes through the expansion valve R2 to upper column which is at lower pressure then the medium pressure column. Similarly the liquid nitrogen (poor liquid) travels from the medium pressure column to the upper column through an expansion valve R3 where the separation of oxygen and nitrogen occurs. Nitrogen being more volatile passes out as a gas from the top of the column and this waste nitrogen flows through both the heat exchangers cooling the in-coming air. Similarly the product oxygen is also passed through the two heat exchangers to cool the incoming air and then to the filling manifold via a liquid pump. If a small amount of air is vented out from the upper column, higher purity nitrogen can also be obtained firm this plant.R4 valve is provided in order to fasten cooling during start-up after defrost.

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