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<p>Recent studies show that supercritical carbon dioxide (sCO<sub>2</sub>) in a power cycle could perform much better than air or steam power cycles and have a reduced negative effect on the environment, making it a promising solution for future power generation systems. The main objective of the present study is to optimize and compare the 4E (energy, exergy, economic, and environmental) performances of seven different configurations of the sCO<sub>2</sub> Brayton cycle integrated into a natural gas-fired power plant (NFGPP) for large-scale power generation. These configurations have the same output of 10&#xa0;MW but differ in the incorporated enhancement processes. The procedure of this study involves the development of mathematical models and a multi-objective approach to find the optimal design of each configuration. Then, the seven optimized configurations were compared to choose the best layout to be adopted in this kind of thermal plant. The innovation of this study lies in the multi-objective optimization performed to identify the optimal trade-offs between system efficiencies and net present value (NPV), and in the specific configurations chosen for the analyses. The obtained results show that the NFGPP employing the optimized intercooling sCO<sub>2</sub> Brayton cycle achieved the highest energy and exergy efficiencies at 60.75% and 57.31%, respectively. Furthermore, this layout emitted the least CO<sub>2</sub> at 0.99&#xa0;kg/s for each 10&#xa0;MW of generated power. The results also demonstrate that the recompression configuration offered the highest NPV at 264.78&#xa0;M$ over 35&#xa0;years, with moderate capital costs (9.56&#xa0;M$) and operation/maintenance costs (0.3823&#xa0;M$/year).</p> Graphical Abstract <p></p>

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Multi-objective optimization and 4E comparative analysis of different sCO2 power plant configurations integrated to a natural gas-fired power plant

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • T. E. Boukelia,
  • W. M’hamdioua,
  • T. Ziane

摘要

Recent studies show that supercritical carbon dioxide (sCO2) in a power cycle could perform much better than air or steam power cycles and have a reduced negative effect on the environment, making it a promising solution for future power generation systems. The main objective of the present study is to optimize and compare the 4E (energy, exergy, economic, and environmental) performances of seven different configurations of the sCO2 Brayton cycle integrated into a natural gas-fired power plant (NFGPP) for large-scale power generation. These configurations have the same output of 10 MW but differ in the incorporated enhancement processes. The procedure of this study involves the development of mathematical models and a multi-objective approach to find the optimal design of each configuration. Then, the seven optimized configurations were compared to choose the best layout to be adopted in this kind of thermal plant. The innovation of this study lies in the multi-objective optimization performed to identify the optimal trade-offs between system efficiencies and net present value (NPV), and in the specific configurations chosen for the analyses. The obtained results show that the NFGPP employing the optimized intercooling sCO2 Brayton cycle achieved the highest energy and exergy efficiencies at 60.75% and 57.31%, respectively. Furthermore, this layout emitted the least CO2 at 0.99 kg/s for each 10 MW of generated power. The results also demonstrate that the recompression configuration offered the highest NPV at 264.78 M$ over 35 years, with moderate capital costs (9.56 M$) and operation/maintenance costs (0.3823 M$/year).

Graphical Abstract