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Multi-objective optimization of a hybrid gas turbine combined cycle system with LNG cold energy integration

Author

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  • Chai, Lijun
  • Huo, Zhaoyi
  • Zhang, Xiaoling
  • Han, Yixuan
  • Huang, Yao
  • Mei, Hongkun

Abstract

The gas turbine combined cycle (GTCC) is widely used in the energy sector for high efficiency, yet its performance can be further improved. This study proposes two schemes for integrating LNG cold energy into a gas-steam combined cycle system: one cools the gas turbine intake air (Scheme Ⅰ), and another further cools the condenser water (Scheme Ⅱ). A thermoeconomic multi-objective optimization model was developed, considering investment cost, net profit and carbon emissions. Results show both integrated schemes outperform the conventional system. The optimized LNG-integrated systems achieve higher net profit and lower specific carbon emissions than the baseline. Cascade cold energy utilization in Scheme II provides a superior synergy between net profit and emissions. Although requiring higher initial investment, these integrated systems offer a compelling trade-off for sustainable power generation.

Suggested Citation

  • Chai, Lijun & Huo, Zhaoyi & Zhang, Xiaoling & Han, Yixuan & Huang, Yao & Mei, Hongkun, 2026. "Multi-objective optimization of a hybrid gas turbine combined cycle system with LNG cold energy integration," Energy, Elsevier, vol. 353(C).
    • Handle: RePEc:eee:energy:v:353:y:2026:i:c:s0360544226010212
    DOI: 10.1016/j.energy.2026.140916
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