EXERGY ANALYSIS AND DESIGN OF MIXED CO2 STEAM GAS-TURBINE CYCLES/

The capturing and disposal of CO2 from power plant exhaust gases is a possible route for reducing CO2 emissions. The present paper investiga tes the full recirculation of exhaust gases in a gas turbine cycle, co mbined with the injection of steam or water. Such recirculation leads to an exhaust gas with very high CO2 concentration (95% or more). Diff erent regenerative cycle layouts are proposed and analyzed for efficie ncy, exergy destruction and technical feasibility. Pinch Technology me thods are next applied to find the best configuration for heat regener ation and injection of water. From this analysis, dual pressure evapor ation with water injection in the intercooler emerges as an interestin g option.