The basic principle of air separation is to use low temperature distillation method to condense the air into a liquid, and separate the air according to the different evaporation temperatures of each component. Pure nitrogen and oxygen are obtained at the top and bottom of the upper column.
Liquid oxygen and nitrogen can also be removed from the evaporating side and the condensing side of the main cooling. The air separation in the rectification column is divided into two stages, air is separated for the first time in the lower tower to obtain liquid nitrogen and oxygen-rich liquid air; Oxygen - rich liquid air is sent up the tower for rectification to obtain pure oxygen and pure nitrogen. The upper tower is divided into two sections: the liquid-air feed port is the boundary, the upper part is the rectification section, the distillation of rising gas, the recovery of oxygen components, purification of nitrogen purity, the lower part is the distillation section, the nitrogen components in the liquid are separated out, to improve the oxygen purity of the liquid.
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