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PSA 공정에서 압력비, 원료기체 및 세정기체 속도의 영향
Effects of Pressure Ratio, Feed Rate, and Purge Rate on PSA Performance
HWAHAK KONGHAK, June 1994, 32(3), 414-424(11), NONE
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Abstract
공기로부터 산소를 분리 및 농축시키는 PSA공정을 대상으로 분리성능에 대한 평가를 수치해석에 의해 순도, 회수율, 생산성 세 가지 측면에서 조사하였다. 원료기체 속도가 고정되어 있을 때 얻을 수 있는 최대의 순도가 존재하였으며 기체 속도와 압력비가 큰 경우에 세정기체량과 원료기체량의 비의 증가에 따라 순도가 증가하다가 감소하였다. 압력이 일정한 상태에서는 회수율 대 순도를 나타내는 평면상에서 조업이 가능한 영역이 있고 불가능한 영역이 있음을 보여졌다. 즉 일정한 순도에서 생산성이 최대로 되는 지점이 존재하였으며 그 때의 원료기체 속도와 세정기체 속도는 회수율이 최대로 되는 조건과는 다르게 나타났다. 회수율은 압력비가 5이상으로 증가하여도 거의 변화가 없었으나 생산성은 늘어나는 것으로 보여졌다.
Pressure swing adsorption process for oxygen production from air was studied by numerical simulation to estimate product purity, recovery, and productivity. At a fixed feed rate, maximum purity exists. In case of large feed velocity and pressure ratio, purity increases, then decreases as purge-to-feed ratio increases. Feasible region could be found in a figure showing recovery versus purity with fixed pressure ratio. From this figure, maximum recovery could be obtained for a given purity. Maximum productivity for a given purity was obtained at different operating conditions. As pressure ratio increases above 5, recovery hardly changes and productivity increases considerably.
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