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3.4.4 Pressurization Step As the pressurization step is from P = 0 to P = PH , the number of moles of product used is just the number of moles of gas in a bed at P = PHwith y = 0. M _P "S V B R ~ RT Bg Therefore, the final number of moles in the product piston is: Np2 - Npl - NPR Upon substituting, the number of moles of product left is: (3.82) (3.83) The gas used for pressurization is again taken from the product, expanded through a reversible turbine to recover th e energy, a n d p u t into th e bed until th e pressure in the bed is PH. The pressurization work is calculated using the same formula as that used for pressurization of the Four-Step cycle and the Ideal Four-Step cycle, but the integration is done from P = 0 to P = PH. TM JoBg p (3-85) d This can be integrated and results in the following expression for the work recovered in pressurizing the bed. W =PH^i- (3-86) 93PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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