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Direct-fired oxy-combustion supercritical-CO2 power cycle with novel preheating configurations -thermodynamic and exergoeconomic analyses

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  • Sleiti, Ahmad K.
  • Al-Ammari, Wahib
  • Ahmed, Samer
  • Kapat, Jayanta

Abstract

Energy, exergy, and exergoeconomic analyses of novel direct-fired oxy-fuel combustion supercritical CO2 cycle with preheating and dry-cooling are introduced. Novelty aspects of the study include the preheating process effect on the performance of sCO2 cycle fired by oxy-combustor at moderate turbine inlet temperatures. Three cycles are investigated; original layout without-preheater (configuration M1), integrated preheater with the system in parallel with low-temperature recuperator (configuration M2) and integrated preheater in parallel with both high and low-temperature recuperators (configuration M3). Results show that the integrated preheating process improves cycle efficiency by 3.7% in M2 and by 8.3% in M3. The preheating improves the performance of recuperator by reducing the “pinch-point” effect as a result of the split flow downstream the compressor. The optimization of the split ratio resulted in cycle efficiency of 45.8% in M3, 41.2% in M2, and 37.5% in M1 for 50MWe system at 750 °C turbine inlet temperature. The overall exergy efficiency is improved from 78.1% in M1 to 86.5% in M2 and 88.8% in M3. The exergoeconomic analysis; the first applied to direct-fired oxy-fuel sCO2 cycle, showed reduction in total product cost per unit exergy by 13.92% in M2 and 34.96% in M3.

Suggested Citation

  • Sleiti, Ahmad K. & Al-Ammari, Wahib & Ahmed, Samer & Kapat, Jayanta, 2021. "Direct-fired oxy-combustion supercritical-CO2 power cycle with novel preheating configurations -thermodynamic and exergoeconomic analyses," Energy, Elsevier, vol. 226(C).
    • Handle: RePEc:eee:energy:v:226:y:2021:i:c:s0360544221006903
    DOI: 10.1016/j.energy.2021.120441
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    Cited by:

    1. Alenezi, A. & Vesely, L. & Kapat, J., 2022. "Exergoeconomic analysis of hybrid sCO2 Brayton power cycle," Energy, Elsevier, vol. 247(C).
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    3. Sun, Enhui & Ji, Hongfu & Wang, Xiangren & Ma, Wenjing & Zhang, Lei & Xu, Jinliang, 2023. "Proposal of multistage mass storage process to approach isothermal heat rejection of semi-closed S–CO2 cycle," Energy, Elsevier, vol. 270(C).

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