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Physical principle of condensing evaporator

Physical principle of condensing evaporator
Jul 05, 2022
Author: DEAR AST

Generally, the liquefaction temperature of nitrogen is higher than that of oxygen, but the condensing evaporator between the upper and lower towers of the air separation tower can use the condensation of gas and nitrogen to vaporize liquid oxygen. This is because we usually think that the premise that the liquefaction temperature of nitrogen is lower than that of oxygen is under the same pressure, while the pressure at the top of the lower tower is about 0.58mpa, and the pressure at the bottom of the upper tower is generally 0.149ma, Different pressures cause the inversion of oxygen and nitrogen saturation temperature. Using this principle, the condensation evaporator can continuously provide liquid nitrogen as reflux liquid for the lower tower, and provide gas oxygen as rising gas for the upper tower to participate in fractionation.

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