The KDON-50 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%.

*Good safety - the external compression process uses oxygen to compress in the form of gas at room temperature, while the internal compression process uses liquid oxygen to compress in the form of liquid at low temperature. The internal compression process has higher safety performance, and the main cooling system extracts a large amount of liquid oxygen to ensure that hydrocarbons do not accumulate; The high evaporation pressure of liquid oxygen reduces the possibility of hydrocarbon accumulation; Reduce fire hazards.

*High reliability - The liquid oxygen pump has excellent performance and is easy to maintain; The first or second stage compression of an air booster is more reliable than the third or fifth stage compression of an oxygen compressor.