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Exhaust gas recirculation applied to single-shaft gas turbines: An energy and exergy approach

Author

Listed:
  • Hachem, Joe
  • Schuhler, Thierry
  • Orhon, Dominique
  • Cuif-Sjostrand, Marianne
  • Zoughaib, Assaad
  • Molière, Michel

Abstract

The present energy mix is leaning towards natural gas as solution to reduce our carbon footprint due to its relatively low GHG emission factor. Gas Turbines could therefore be a great short-to-mid-term solution to fight climate change. The gas turbine flexibility, or part-load operation, is an indispensable asset in some O&G applications and in the hybridization with renewable energies applications. However, operating at part-load also means degrading the cycle efficiency. Exhaust gas recirculation ‘EGR’ applied to gas turbines is a well-known technology used to decrease the NOx emissions and enhance carbon capture and storage, but also, to potentially improve the part-load efficiency. In this article, the impact of EGR is investigated on full-load and part-load operations of gas turbines while dissociating the two effects generated by the EGR, the Inlet Air Heating ‘IAH’ and the change in air composition ‘CAC’. The energy approach using a thermodynamic model showed the intrinsic negative impact of EGR on gas turbines that can reach up to 0.25 points at 50 % recirculation at full-load; however, it is also showed the potential part-load efficiency compensation due to the IAH effect that could improve by 1 point the efficiency at 50 % load and 50 % recirculation rate.

Suggested Citation

  • Hachem, Joe & Schuhler, Thierry & Orhon, Dominique & Cuif-Sjostrand, Marianne & Zoughaib, Assaad & Molière, Michel, 2022. "Exhaust gas recirculation applied to single-shaft gas turbines: An energy and exergy approach," Energy, Elsevier, vol. 238(PB).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pb:s0360544221019046
    DOI: 10.1016/j.energy.2021.121656
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    References listed on IDEAS

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    1. Jing Bian & Liqiang Duan & Yongping Yang, 2023. "Simulation and Economic Investigation of CO 2 Separation from Gas Turbine Exhaust Gas by Molten Carbonate Fuel Cell with Exhaust Gas Recirculation and Selective Exhaust Gas Recirculation," Energies, MDPI, vol. 16(8), pages 1-21, April.
    2. Barakat, Elsayed & Jin, Tai & Wang, Gaofeng, 2023. "Performance analysis of selective exhaust gas recirculation integrated with fogging cooling system for gas turbine power plants," Energy, Elsevier, vol. 263(PC).
    3. Ivan Sadkin & Mariia Mukhina & Evgeny Kopyev & Oleg Sharypov & Sergey Alekseenko, 2023. "Low-Emission Waste-to-Energy Method of Liquid Fuel Combustion with a Mixture of Superheated Steam and Carbon Dioxide," Energies, MDPI, vol. 16(15), pages 1-16, August.

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