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Feasibility Study of Scheme and Regenerator Parameters for Trinary Power Cycles

Author

Listed:
  • Vladimir Kindra

    (Department of Innovative Technologies for High-Tech Industries, National Research University “Moscow Power Engineering Institute”, Krasnokazarmennaya, 14, 111250 Moscow, Russia)

  • Igor Maksimov

    (Department of Innovative Technologies for High-Tech Industries, National Research University “Moscow Power Engineering Institute”, Krasnokazarmennaya, 14, 111250 Moscow, Russia)

  • Ivan Komarov

    (Department of Innovative Technologies for High-Tech Industries, National Research University “Moscow Power Engineering Institute”, Krasnokazarmennaya, 14, 111250 Moscow, Russia)

  • Cheng Xu

    (Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education, North China Electric Power University, Beijing 102206, China)

  • Tuantuan Xin

    (Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education, North China Electric Power University, Beijing 102206, China)

Abstract

Natural gas-fired combined cycle plants are nowadays one of the most efficient and environmentally friendly energy complexes. High energy efficiency and low specific emissions are achieved primarily due to the high average integral temperature of heat supply in the Brayton–Rankine cycle. In this case, the main sources of energy losses are heat losses in the condenser of the steam turbine plant and heat losses with the exhaust gases of the waste heat boiler. This work is related to the analysis of the thermodynamic and economic effects in the transition from binary to trinary cycles, in which, in addition to the gas and steam–water cycles, there is an additional cycle with a low-boiling coolant. A method for the feasibility study of a waste heat recovery unit for trinary plants is proposed. The schematic and design solutions described will ensure the increased energy and economic performance of combined cycle power plants. Based on the results of the thermodynamic optimization of the structure and parameters of thermal schemes, it was found that the use of the organic Rankine cycle with R236ea freon for the utilization of the low-grade heat of a trinary plant’s exhaust gases operating from a GTE-160 gas turbine makes it possible to achieve a net electrical efficiency of 51.3%, which is a 0.4% higher efficiency for a double-circuit combined cycle gas turbine plant and a 2.1% higher efficiency for a single-circuit cycle with similar initial parameters. On the basis of the conducted feasibility study, the parameters and characteristics of the heat exchangers of the regenerative system of the waste heat recovery unit are substantiated. The use of plain fin-and-tube heat exchangers in the regenerative system of the utilization cycle is the most promising solution. It was found that the level of allowable pressure loss in the regenerator of 10 kPa and the degree of regeneration of 80% allow for maximum economic efficiency of the waste heat recovery unit.

Suggested Citation

  • Vladimir Kindra & Igor Maksimov & Ivan Komarov & Cheng Xu & Tuantuan Xin, 2023. "Feasibility Study of Scheme and Regenerator Parameters for Trinary Power Cycles," Energies, MDPI, vol. 16(9), pages 1-25, May.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:9:p:3886-:d:1139291
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    References listed on IDEAS

    as
    1. Nikolay Rogalev & Vladimir Kindra & Ivan Komarov & Sergey Osipov & Olga Zlyvko & Dmitrii Lvov, 2021. "Comparative Analysis of Low-Grade Heat Utilization Methods for Thermal Power Plants with Back-Pressure Steam Turbines," Energies, MDPI, vol. 14(24), pages 1-15, December.
    2. Carlo Carcasci & Lapo Cheli & Pietro Lubello & Lorenzo Winchler, 2020. "Off-Design Performances of an Organic Rankine Cycle for Waste Heat Recovery from Gas Turbines," Energies, MDPI, vol. 13(5), pages 1-15, March.
    3. Andrey Rogalev & Nikolay Rogalev & Vladimir Kindra & Olga Zlyvko & Andrey Vegera, 2021. "A Study of Low-Potential Heat Utilization Methods for Oxy-Fuel Combustion Power Cycles," Energies, MDPI, vol. 14(12), pages 1-14, June.
    4. Zhang, Cheng & Liu, Chao & Wang, Shukun & Xu, Xiaoxiao & Li, Qibin, 2017. "Thermo-economic comparison of subcritical organic Rankine cycle based on different heat exchanger configurations," Energy, Elsevier, vol. 123(C), pages 728-741.
    5. Dominika Matuszewska & Piotr Olczak, 2020. "Evaluation of Using Gas Turbine to Increase Efficiency of the Organic Rankine Cycle (ORC)," Energies, MDPI, vol. 13(6), pages 1-21, March.
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