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3.3.2 Feed Step The work required to inject the feed gas and deliver product for the Ideal Four- Step cycle (WF) is the same as that for the Four-Step cycle. The derivation is not repeated and the reader is referred to Section 3.2.2. 3.3.3 Blowdown Step During the blowdown step, energy can be recovered from any gas leaving th e bed while the pressure in the bed is greater than atmospheric. Any gas that leaves the bed while the pressure in the bed is less than atmospheric requires work. The work for the entire step is found b y placing a reversible turbine between th e b e d a n d th e atmosphere (see Figure 3.19). P y Figure 3.19 Reversible Turbine used in Blowdown. The work WB is found using the same equations developed in Section 3.2.3, but the limits of integration are PH and PL, regardless of what these values are with respect to Po. The two equations which must be solved simultaneously are: yy-P y-iy-P p Vy0J {yo-V (3.67) (3.68) 79PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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