Overall Process Analysis and Optimisation for CO_2 Capture from Coal Fired Power Plants based on Phase Change Solvents Forming Two Liquid Phases

摘要

In this work the potential of a novel post-combustion CO_2 capture process is analysed with respect to the integrated overall process. As solvent a blend of two amines (DEEA/MAPA) which forms two liquid phases under CO_2 loading is used. The two phases have distinct physical characteristics. Only the heavy phase, rich in CO_2 loading, is led to the desorber. The novel solvent combination promises very low energy consumption compared to a 30 wt.-% MEA solution. The efficiency penalty, taking into account the integrated overall process, is very low too. Furthermore, different integration configurations in the overall process are investigated to show the effect in greenfield and retrofit power plant cases.