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The KDON-80 air separation equipment is a set of air separation equipment that simultaneously extracts oxygen and nitrogen from the air. It is a new type of fully low-pressure process with a turbine expander.

The purified incoming air exchanges heat with the reflux gas in the main heat exchanger and is gradually cooled into saturated air with a small amount of liquefaction before entering the lower tower for distillation. Distillation is the process of obtaining pure oxygen and nitrogen through multiple partial evaporation and partial condensation in a fractionator using different boiling points of oxygen and nitrogen. The function of the lower fractionation tower is to produce liquid air and liquid nitrogen. The main condenser evaporator is used to evaporate liquid oxygen and condense gas nitrogen at different pressures under low pressure, while the upper fractionation tower is used to obtain product oxygen .

It has the following characteristics:

*The oxygen purity is high and very stable, maintaining above 99.7%.