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Process modifications for a hot potassium carbonate‐based CO2 capture system: a comparative study

Foster Kofi Ayittey, Christine Ann Obek, Agus Saptoro, Kumar Perumal and Mee Kee Wong

Greenhouse Gases: Science and Technology, 2020, vol. 10, issue 1, 130-146

Abstract: Chemical absorption using hot potassium carbonate (K2CO3) is believed to be a more energy‐efficient post‐combustion CO2 capture technology as compared to conventional amine‐based absorption processes. That notwithstanding, literature information on how process modifications could render this technology more appealing are limited. In this study, seven different modified process configurations have been investigated to observe their impacts on the system performances of a typical hot K2CO3‐based capture system. The results demonstrate that flue gas precooling is capable of improving the carbon removal level in the K2CO3‐based capture system by 11.46% over the base case value. This was achieved by precooling the flue gas stream from 110 to 70°C before feeding into the absorber column. Other modified process systems such as the rich solvent pre‐heating and lean vapour compression were equally observed to decrease the specific stripper reboiler duty by 24.28% and 21.38%, respectively. The findings from this research prove that process modifications are capable of enhancing the system performances of the hot K2CO3‐based post‐combustion CO2 capture technology. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2020
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