Method for separating nitrogen and oxygen from air based on hollow fiber film

Abstract

The invention discloses a method for separating nitrogen and oxygen from air based on hollow fiber film, including the following steps: S1, calculating the different values of the inlet air pressure respectively when the flow values of oxygen at the outlet of the film are different, and when the inlet air temperature and oxygen concentration at the air outlet of the film are the same; S2, calculating the value of beta 0 and beta 1 according to the different oxygen flow values at the film outlet and the different inlet pressure values; S3, obtaining the function relational expression y=beta 0+beta 1; S4, calculating the different values of the inlet air pressure when the oxygen concentration at the film outlet and the oxygen flow value at the film outlet are the same, and when the inlet air temperatures are different; S5, calculating the tolerance d according to the different inlet air pressures obtained in S3; S6,obtaining the function relational expression yT=yt+(T-t)d; S7, calculating the actual inlet air pressure required according to the function relational expression y=beta 0+beta 1 and yT=yt+(T-t)d.

Description

technical field [0001] The invention relates to the technical field of air nitrogen and oxygen separation, in particular to a method for realizing air nitrogen and oxygen separation based on hollow fiber membranes. Background technique [0002] Nitrogen accounts for 78%, oxygen accounts for 21%, and the remaining 1% of other gases constitute the air in which we humans live. With the development of human beings and the progress of science and technology, the present invention is based on a polymer material hollow fiber membrane to separate the nitrogen and oxygen components in the air, and through an effective control method to arbitrarily adjust the concentration ratio of nitrogen and oxygen at the gas outlet. The compressed air enters the air inlet of the hollow fiber membrane, and the membrane has two air outlets, one is a nitrogen-enriched air outlet (that is, a nitrogen-enriched port) and the other is an oxygen-enriched air outlet (that is, an oxygen-enriched port). Thr...

AI Technical Summary

Problems solved by technology

Hollow fiber membranes are used in various industries, but the existing technical research has not found the relationship between the temperature of the gas entering the membrane, the pressure of the gas entering the membrane, and the flow rate of the outlet gas affecting the oxygen concentration of the gas outlet, so it is impossible to realize automatic stepless stable control

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