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interact with each other during the course of the PSA process and undergoes the same set of cycle steps in a sequential manner. Figure 4.2(b) shows the periodic state pressure profile for bed 1 for the run E-1. The reflux ratio or the purge to feed ratio (γ) is the ratio of the flow of the purge gas entering the bed during the LR step to that of the feed gas entering the F step. γ is a very important design parameter that has a significant effect on the process performance in terms of recovery and purity of the heavy product (Reynolds, Ebner and Ritter 531-536; Reynolds, Ebner and Ritter 334-342; Reynolds, Ebner and Ritter 4278-4294; Reynolds, Mehotra and Ebner). A large γ means a lot of light gas enters the bed during the LR step enhancing desorption of the heavy product from the adsorbent and consequently better adsorbent regeneration. However, a large LR flow dilutes the effluent gas that exits the bed undergoing LR step. For a PSA process where the heavy product is produced from LR step, higher γ results in higher CO2 recoveries but lower CO2 purity in the heavy product (Reynolds, Ebner and Ritter 531-536; Reynolds, Ebner and Ritter 334-342; Reynolds, Ebner and Ritter 4278-4294; Reynolds, Mehotra and Ebner). A large γ is necessary to better regenerate the bed and reduce the breakthrough of CO2 from the light end of the bed during the F and HR steps. The relative dilute LR effluent can be completely recycled back into the system as feed gas to the bed undergoing the HR step while the heavy product can only be produced only form the CnD step. Experiments E-1, E-2 and E-3 were performed at three different γ by keeping other process parameters the same. Table 4.2 shows that the CO2 concentration in the HR stream decreases as γ was increased (E-1 to E-3). 23PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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