What are the environmental conditions that affect the performance of air separation plants?

2017-03-11

What are the environmental conditions that affect the performance of air separation plants?
A: The environmental conditions include atmospheric pressure, ambient temperature, atmospheric humidity and the presence of impurities such as CO2 in the air. These conditions vary with the region, and climatic conditions change the performance of the same air separation unit.
1) atmospheric pressure. The atmospheric pressure fluctuates around 0.1 MPa. A decrease in atmospheric pressure will increase the compression ratio of the air compressor. Atmospheric pressure reduction of 0.01MPa, will reduce the compression ratio of air compressor 6% to 8%, increasing the energy consumption of compression. In addition, due to the mass ratio of the volume increase (density decreases), the air compressor displacement is reduced, the corresponding oxygen production will be reduced, oxygen unit power consumption increases.
2) the impact of ambient temperature. Ambient temperature increases, will reduce the air compressor displacement, shaft power increases. Ambient temperature increased by 3 ℃, shaft power increased by about 1%. In addition, the ambient temperature will also increase the air compressor air temperature, increased cooling, requiring more cooling capacity to balance the loss, and ultimately lead to increased energy consumption.
3) the effect of air humidity. The air humidity increases, so that part of the compressor power consumption in the compressed water vapor, resulting in air compressor shaft power increases.
4) the impact of impurities in the air. The amount of impurities in the air increases, making the molecular sieve adsorber purification load increases.


 

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