Design and Operation of Pressure Swing Adsorption Processes

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Design and Operation of Pressure Swing Adsorption Processes ( design-and-operation-pressure-swing-adsorption-processes )

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Chapter 4 Superstructure Case Study: Post-combustion CO2 Capture Synopsis Recent developments have shown PSA/VSA to be a promising option to effectively capture CO2 from flue gas streams. In most commercial PSA cycles, the weakly adsorbed component in the mixture is the desired product, and enriching the strongly adsorbed CO2 is not a concern. On the other hand, it is necessary to concentrate CO2 to high purity to reduce CO2 sequestration costs and minimize safety and environmental risks. Thus, it is necessary to develop PSA processes specifically targeted to obtain pure strongly adsorbed component. We demonstrate the superstructure approach for case studies related to post-combustion CO2 capture. In particular, optimal PSA cycles are synthesized which maximize CO2 recovery and minimize overall power consumption. The results show the potential of the superstructure to predict PSA cycles with up to 98% purity and recovery of CO2. Moreover, for purity of over 90%, these cycles can recover CO2 from atmospheric flue gas with a low power consumption of 465 kWh/tonne CO2 captured. Superstructure approach is, therefore, quite useful for assessing PSA for post-combustion CO2 capture. Chapter 4. Superstructure Case Study: Post-combustion CO2 Capture 47

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