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from PH to Po, no work is required, but from Po to PL, work is required as a partial vacuum is created in the bed. Figure 3.6 Bed Mole Fraction DuringBlowdown at (a)P = PH, (b)P = Po, and (c)P = Pi. The equations for the reversible work required to depressurize an adsorbent bed while rejecting gas at an arbitrary pressure Px are developed in Appendix A. Two cases of this work will be presented here: PH > Po >PL and Po > PH > PL. The third possible case, in which both PH and PL are greater than Po, requires no work. For the first case, we are rejecting gas at atmospheric pressure (Px = Po) and our limits of integration are Po and PL. (3.29) WB = \, rln * dP -eVB BB[\-^{p-\)y\~\P0J As noted above, the mole fraction y in Equation (3.19) is a function of pressure, and varies according to the following equation, which is the same as Equation (12) in Knaebel and Flill (1985). 52PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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