Investigation on post-combustion CO2capture from NGCC power plant

In this study a 1000 MW NGCC power plant has been integrated with post-combustion CO2capture and compression process to mitigate its emission. The MEA-based CO2capture process was designed for 90% CO2separation. The detailed models of the power plant, CO2capture and compression process were developed in Aspen HYSYS v9 in order to analysethe performance of the integrated system. Three cases of integration have been investigated. Inthe first case, the power plant net thermal efficiency was decreased from 62.5% to 53.4%. This efficiency drop due to steam extraction from the powerplant to provide reboiler duty and power consumption by capture and compression process. The effect of exhaust gas recirculation (EGR) on the plant performance was studied in the second case. EGR implementation and waste heat recovery by organic Rankine cycle in the thirdcase led to an increase of 1.56% in the power plant efficiency in comparison with the first case. The CO2 emission of the power plant was decreased from 324.71 g/kWh to 36.71g/kWh in the third case of integration.