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step while the 3-bed process used both light and heavy reflux steps. Flow reversal was implemented in between the pressurization and depressurization steps in the 2-bed process. The maximum CO2 purity achieved was 63% using a 3-bed 6-step cycle. In a study, Ko et al. (Ko, Siriwardane and Biegler) were able to achieve a CO2 purity of 90% and CO2 recovery of 94% by an optimized 1-bed 4-step fractionated VPSA process. Grande et al. (Grande, Cavenati and Rodrigues), studied 3-bed 5-step process which include a pure CO2 rinse step after the adsorption step. They were able to achieve a purity of 83% and a recovery of 66% at a very high feed throughput of 48.57 kmol/hr. Chaffee et al. (Chaffee, Knowles and Liang) studied a 3-bed 6-step VSA process at a feed throughput of 0.193 kgmol/hr and were able to achieve a lower power consumption of 192 kWh/ton CO2. On the other hand Zhang et al. (Zhang, Webley and Xiao) achieved a power consumption of 240 kWh/ton CO2 at the same feed throughput of 0.193 kWh/ton CO2 with a 3-bed 9-step VSA process. Xiao et al. (Xiao, Webley and Li) achieved a CO2 recovery of 75% with a similar 3-bed 9-step cycle. Zhang and Webley (Zhang and Webley, Cycle Development and Design for CO2 Capture from Flue Gas by Vacuum Swing Adsorption) investigated a number of different VSA configurations and concluded that, by incorporating heavy reflux and equalization steps CO2 purity can be increased. The main objective of the current study is to develop a PSA process to capture CO2 from the flue gas containing 15% CO2 and balance N2 using 13X zeolite. It is very important to have a reliable process simulator to design any process. The in-house FORTRAN based dynamic adsorption process simulator (DAPS) was validated by fitting the experimental results of the PSA experiment conducted in a single bed apparatus using PSA experiment performed in a single bed PSA apparatus. 6PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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