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cycle, we are able to recover about 80% of CO2 at a substantially high purity of 95%, and at a significantly high feed flux of 80 kgmol m−2 hr−1. Next, we develop an optimal configuration which yields high-purity separation with minimal power requirements. Optimal profiles trans- late in a 2-bed 8-step VSA configuration which, at 90% purity and 85% recovery, extracts CO2 with a substantially low power consumption of 465 kWh/tonne CO2 captured. We also apply the superstructure methodology for pre-combustion CO2 capture in Chapter 5. When CO2 recovery is maximized, superstructure optimization results in a 2-bed 8-step VSA cycle which can produce both H2 and CO2 at a substantially high purity of 98% and 90%, respectively. Changing the objective to minimizing power consumption yields an entirely different 2-bed 10-step VSA cycle which can produce CO2 at a purity of 90% and a recovery of 92% with a significantly low power consumption of 46.82 kWh/tonne CO2 captured. Our contributions for this part of the dissertation are as below: • First systematic methodology for cycle design All the studies in the literature so far only suggest simplistic formulations to determine minimum number of beds required in a PSA process with a given fixed sequence of operating steps. To the best of our knowledge, this is the first instance when a system- atic methodology is proposed to design, evaluate and optimize PSA processes, and the first instance when a PSA superstructure is succesfully developed and demonstrated to determine an optimal sequence of operating steps for a given number of beds. • PSA as a potential technology for CO2 capture By developing cycles that can extract CO2 at a purity of over 95% for post-combustion capture, and with a power consumption as low as 46.82 kWh/tonne CO2 captured for pre- combustion capture, we successfully project PSA as a promising and viable technology for both post-combustion and pre-combustion carbon capture. We not only synthesize cycles which are practically feasible, but also suggest operating steps which should be in- corporated in a PSA process for high-purity CO2 capture. More importantly, we discover novel operating steps such as the total reflux step which have never been seen before in Chapter 8. Conclusions 186 8.1 Thesis Summary and ContributionsPDF Image | Design and Operation of Pressure Swing Adsorption Processes
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