The relationship between the pressurized turbine expander and the rectification in the upper section of the distillation column
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In the nitrogen-oxygen plant process flow, why does installing a booster pump before the expander improve the distillation efficiency of the twin distillation columns? Set the relationship between the superheat of the expanded air and the booster? What is the relationship between superheat and the oxygen extraction rate in air separation plants?
Using a pressurized turbine for expansion can, first, increase the cooling capacity; second, it reduces the amount of air that undergoes expansion. As a result, there is less overall superheat, which has a minor impact on the main tower. If the superheat level is high, the reflux ratio decreases, which poses problems for extracting high-purity nitrogen, and the yield of oxygen also decreases. It becomes difficult to achieve both high levels of purity. Of course, there are many other factors as well; I’ll continue discussing them below