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purge and pressurization steps, with little of the original product left at the end of the cycle(NP2 =Npi-NP U -NPR). Table 4.3 Gas Quantity and Composition. N F yo NB D yBD N w y w N E y E NPI 355.37 0.78 300.31 0.850 31.89 0.683 332.20 0.8344 239.45 {mol} {-} {mol} {-} {mol} H {mol} H {mol} {mol} {mol} {mol} {-} {%} {mol/m3} Number of moles in the feed Mole fraction of the feed (air) Number of moles of blowdown gas Mole fraction of the blowdown gas Number of moles of purged gas Mole fraction of the purged gas Number of moles of exhaust gas Mole fraction of the exhaust gas Number of moles of product delivered during feed step Number of moles of product used to purge bed Number of moles of product used to pressurize bed Number of moles of product remaining as product Mole fraction of the product (pure oxygen) Recovery of oxygen Productivity of the adsorbent bed 22.78 193.50 23.17 yp 0 Rec. 29.64 Prod. 231.7 NPU N p R NP 2 The recovery of oxygen is also given, and productivity is given in units of moles per cubic meter of adsorbent bed (productivity is usually given in terms of amount of product per unit amount of adsorbent per unit length of time, but as the analysis of Knaebel and Hill (1985) is based on equilibrium theory, time is irrelevant). Banerjee et al. calculate the availability of the gases at the different positions in the system (see Figure 4.1 and Figure 4.2) and then produce a Grassman diagram, which represents the availability of the different streams with bars of proportional width. Figure 4.3 is the Grassman diagram for this separation example as given by Banerjee. It 101PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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