Abstract
The purity of CO2 influences on energy performance in CO2 capture process. The effects of that were evaluated for post-combustion capture and pre-combustion capture using a process simulation method. In post-combustion capture using a chemical solvent, high purity CO2 with the concentration of more than 99% was easily obtained, but a large reboiler heat duty was required. In pre-combustion capture from IGCC syngas using a physical solvent, CO2 purity changed by operating conditions such as the pressure of a flash tank. Since energy requirement gradually increased with increasing the CO2 purity and steeply increased when the CO2 purity reached 99%, CO2 purity of below 99% will be reasonable for the physical absorption. Membrane also should be operated under not so high CO2 purity condition to attain an energetic merit. Around 95% should be a reasonable CO2 purity.
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