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2.4 PSA Operation Store solution Light Product Pressurization Adsorption Depressurization Light reflux x t Feed Feed Heavy Product Heavy Product Store CSS (a) Unibed approach x t Bed 2 Bed 1 t Heavy Product Heavy Product Store solution Depressurization Light reflux Light Product Conditions matched simultaneously Pressurization Adsorption x Feed Feed Store solution (b) Multibed approach Figure 2.6: Approaches to match boundary values while simulating multi-bed PSA operations Moreover, due to CSS, conditions for the same bed should be matched at the beginning and the end of the cycle. For instance, Figure 2.5 illustrates such boundary matchings with the spatial domain and time chart of the two-bed four-step process shown in Figure 2.3. First, since a small amount of the light product exiting during the adsorption step is recycled as a reflux to the second bed for desorption, the conditions at the ends of the beds need to be matched. Next, since the final bed conditions at the end of an operating step serve as the intial condition for the next step, bed profiles should be matched. Finally, for CSS, bed profiles at the beginning and the end of the cycle should be matched. The boundaries where conditions need to be matched are shown in bold in Figure 2.5. Chapter 2. Pressure Swing Adsorption 26PDF Image | Design and Operation of Pressure Swing Adsorption Processes
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