The energy flow is densitive and the parasitic energy is high for the CO2 capture process with MEA (monoethanolamine) method in power plant. The energy saving based on process integration is important. The characteristics of the grand composite curve justifies the nature of high energy consumption of the CO2 capture process. The pinch analysis of heat exchange net shows the heat transfer across the pinch point. The heat exchange net is optimized and the energy saving projects are: (1) Above the pinch point

the high temperature heat energy from the MEA lean solvent is recovered for the heating of regeneration gas from the pre-absorption tower; (2) Below the pinch point

an ammonia absorption refrigerator driven by the heat of the wet CO2 mixture from the MEA stripper

and the original cold utility for the CO2 liquification is reduced by 43.4%. The energy saving projects based on process integration can reduce the steam consumption and cooling water by 21% and 17.2%

respectively.