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Thermoeconomic Optimization of Steam Pressure of Heat Recovery Steam Generator in Combined Cycle Gas Turbine under Different Operation Strategies

Author

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  • Zhen Wang

    (Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, National Thermal Power Engineering & Technology Research Center, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)

  • Liqiang Duan

    (Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, National Thermal Power Engineering & Technology Research Center, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)

Abstract

The optimization of the steam parameters of the heat recovery steam generators (HRSG) of Combined Cycle Gas Turbines (CCGT) has become one of the important means to reduce the power generation cost of combined cycle units. Based on the structural theory of thermoeconomics, a thermoeconomic optimization model for a triple pressure reheat HRSG is established. Taking the minimization of the power generation cost of the combined cycle system as the optimization objective, an optimization algorithm based on three factors and six levels of orthogonal experimental samples to determine the optimal solution for the high, intermediate and low pressure steam pressures under different gas turbine (GT) operation strategies. The variation law and influencing factors of the system power generation cost with the steam pressure level under all operation strategies are analyzed. The research results show that the system power generation cost decreases as the GT load rate increases, T 4 plays a dominant role in the selection of the optimal pressure level for high pressure (HP) steam and, in order to obtain the optimum power generation cost, the IGV T3-650-F mode should be adopted to keep the T 4 at a high level under different GT load rates.

Suggested Citation

  • Zhen Wang & Liqiang Duan, 2021. "Thermoeconomic Optimization of Steam Pressure of Heat Recovery Steam Generator in Combined Cycle Gas Turbine under Different Operation Strategies," Energies, MDPI, vol. 14(16), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:4991-:d:614351
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    References listed on IDEAS

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    1. Carcasci, Carlo & Cosi, Lorenzo & Ferraro, Riccardo & Pacifici, Beniamino, 2017. "Effect of a real steam turbine on thermoeconomic analysis of combined cycle power plants," Energy, Elsevier, vol. 138(C), pages 32-47.
    2. Duan, Liqiang & Wang, Zhen & Guo, Yaofei, 2020. "Off-design performance characteristics study on ISCC system with solar direct steam generation system," Energy, Elsevier, vol. 205(C).
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    Cited by:

    1. Wang, Zhen & Duan, Liqiang & Zhang, Zuxian, 2022. "Multi-objective optimization of gas turbine combined cycle system considering environmental damage cost of pollution emissions," Energy, Elsevier, vol. 261(PA).
    2. Ren, Siyue & Feng, Xiao & Yang, Minbo, 2022. "Cumulative solar exergy allocation in heat and electricity cogeneration systems," Energy, Elsevier, vol. 254(PC).

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