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Thermoeconomic analysis of a gas turbine and cascaded CO2 combined cycle using thermal oil as an intermediate heat-transfer fluid

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  • Cao, Yue
  • Rattner, Alexander S.
  • Dai, Yiping

Abstract

This paper reports an investigation of a gas turbine (GT) and two-stage cascaded supercritical and transcritical CO2 (s-CO2/t-CO2) combined power cycle using liquefied natural gas (LNG) as a low-temperature heat sink. This cycle may be well-suited for installation near LNG import terminals. GT exhaust supplies input heat to an intermediate s-CO2 cycle through a thermal oil loop. Waste heat from the s-CO2 cycle and residual heat from the GT cycle drives a lower temperature t-CO2 cycle. The t-CO2 cycle is LNG-cooled. A solution procedure is performed to perform a coupled analysis of the thermodynamic and economic performance of this combined cycle. Results show that the GT-cascade CO2 combined cycle has an optimal operating point determined by the s-CO2 compressor inlet conditions. Genetic algorithm (GA) optimization indicates that a Taurus 60 GT-cascaded CO2 combined cycle could reach 51.44% efficiency. For 20-year lifetime and 5% rate of interest, thermoeconomic optimization (after-tax profit, ATP as objective) results show ATP, levelized cost of electricity (LCOE) and net power are $2.935 × 106, $0.0420 kWh−1 and 8.886 MW, respectively. Findings suggest that the GT-cascaded CO2 combined cycle is an efficient and commercially viable technology for power generation.

Suggested Citation

  • Cao, Yue & Rattner, Alexander S. & Dai, Yiping, 2018. "Thermoeconomic analysis of a gas turbine and cascaded CO2 combined cycle using thermal oil as an intermediate heat-transfer fluid," Energy, Elsevier, vol. 162(C), pages 1253-1268.
    • Handle: RePEc:eee:energy:v:162:y:2018:i:c:p:1253-1268
    DOI: 10.1016/j.energy.2018.08.110
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    5. Li, Bo & Wang, Shun-sen, 2022. "Thermodynamic analysis and optimization of a hybrid cascade supercritical carbon dioxide cycle for waste heat recovery," Energy, Elsevier, vol. 259(C).
    6. Jiang, Yuemao & Ma, Yue & Han, Fenghui & Ji, Yulong & Cai, Wenjian & Wang, Zhe, 2023. "Assessment and optimization of a novel waste heat stepped utilization system integrating partial heating sCO2 cycle and ejector refrigeration cycle using zeotropic mixtures for gas turbine," Energy, Elsevier, vol. 265(C).
    7. Zhou, Aozheng & Li, Xue-song & Ren, Xiao-dong & Gu, Chun-wei, 2020. "Improvement design and analysis of a supercritical CO2/transcritical CO2 combined cycle for offshore gas turbine waste heat recovery," Energy, Elsevier, vol. 210(C).

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