What question did this study set out to answer?

This work aims to assess the techno-economic impacts of integrating exhaust gas recirculation with post-combustion carbon capture in CCGT power plants.

February 2, 2026

Energy penalty mitigation through exhaust gas recirculation: A technical evaluation of post-combustion carbon capture integrated with CCGT plants

Key Points

This work aims to assess the techno-economic impacts of integrating exhaust gas recirculation with post-combustion carbon capture in CCGT power plants.
Simulated a natural gas-fired CCGT power plant using Aspen Plus
Evaluated the effects of a 0.33 EGR ratio on CO2 concentrations and oxygen levels
Analyzed economic factors such as steam requirements for CO2 capture
Optimized EGR ratio increases CO2 concentration from 5.44% to 8.22%
Reduced oxygen concentration from 10.56% to 5.61%
Minimized the heat load of PCC by 34.53%
Limited net power output reduction to less than 0.5%
Cost of CO2 capture decreased from $14.23/tonne to $9.26/tonne with EGR at 0.33

Abstract

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.

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