Integration of post-combustion carbon capture (PCC) units, using chemical solvent with combined cycle gas turbine (CCGT) power plants offers a promising strategy for mitigating the escalating CO 2 emissions. Nevertheless, this technology does come at a cost. It penalizes the plant by reducing the net power and overall efficiency. This study investigates the techno-economic effect of EGR on the energy penalty caused by PCC in a natural gas-fired CCGT power plant simulated using Aspen Plus. The results indicate that the utilization of an optimized 0. 33 EGR ratio significantly increases the molar concentration of CO 2 by 51%, from 5. 44% to 8. 22%, while concurrently reducing the oxygen concentration by 46. 82%, from 10. 56% to 5. 61%. Additionally, EGR minimizes the reboiler heat load of PCC by 34. 53% while limiting the net power output by less than 0. 5%. Economic analysis reveals that the steam requirement of CO 2 capture decreases from 14. 23/tonne CO 2 captured (without EGR) to 9. 26/tonne CO 2 captured at an EGR of 0. 33. Furthermore, this work also investigated the relationship between the concentration of CO 2 in the gas stream and subsequent solvent requirements in a PCC unit.
Yasir et al. (Sat,) studied this question.