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3.4.2 Feed Step The feed step for this ideal cycle is the same as for both the Four-Step cycleand the Ideal Four-Step cycle, except that product is only diverted to pressurize the bed; no product is required to purge the bed. This does not change the work done in this step, which is derived in section 3.2.2 (Equation (3.18)). 3.4.3 Evacuation Step The evacuation step is performed by a reversible turbine. Figure 3.27 shows the system used to analyze this step. Po —A. P = P H -> P = 0 W E Figure 3.27 Evacuation ofthe Adsorbent Bed. /r \ / The gas extracted from the bed is rejected at atmospheric pressure, so whenever the bed pressure is greater than Po, a decrease in bed pressure produces work. If the bed pressure is less than atmospheric, a decrease in bed pressure requires work. The formulas used to calculate the evacuation work are those used in previous sections for the blowdown step, with the upper limit being replaced by zero. The formulas, which must be solved simultaneously are: 91PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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