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What are the factors related to the unit power consumption of oxygen generation in the air separation plant?

What are the factors related to the unit power consumption of oxygen generation in the air separation plant?
Jun 05, 2023
Author: DEAR AST
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The unit power consumption of oxygen production W02 (kW • h/m3) is one of the important economic indicators of oxygen production. InAir separation equipmentIn oxygen generation power consumption,Air compressorPower consumption accounts for the most important part. Its power consumption (kw • h/h) is related to the pressure ratio, and the calculation formula is
W=ρvk R′Tln(p2/p1)/(3600ηTηM)
In the formula & rho; -- air density under standard state, & rho; = 1.293 kg/m3;
Vk -- air displacement of air compressor, m3/h;
R & prime; -- gas constant, R & prime; = 0. 278kJ/(kg • K );
T -- ambient temperature, K;
P2 -- exhaust pressure, MPa;
P1 -- air inlet pressure, MPa;
& Eta; T -- the isotherm efficiency of the air compressor;
& Eta; M-the mechanical efficiency of the air compressor.
Therefore, the unit power consumption e02 (kW • h/m3) of compressed air consumed during oxygen generation is
e02= vkρ R′Tln(p2/p1)/( Vo23600ηTηM)
In the formula, Vo2 -- oxygen output, m3/h.
However, the extraction rate of oxygen (see question 20) is
ψ=Vo2•yo2/( Vk•yk)
So
e02= yo2ρ R′Tln(p2/p1)/( ψyk 3600ηTηM)
Thus it can be seen that the unit power consumption of oxygen generation is roughly proportional to the logarithm of pressure ratio and the purity of oxygen; it is inversely proportional to the extraction rate of oxygen and the efficiency of compressor. Therefore, during the operation, the working pressure should be reduced as much as possible; the compressor should be fully cooled to improve the isotherm efficiency of the compressor; the oxygen extraction rate should be improved as much as possible; on the premise of ensuring the product quality, do not pursue product purity too high, in order to reduce unit power consumption.

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