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Thermodynamic Analysis and Optimization of Power Cycles for Waste Heat Recovery

Author

Listed:
  • Igor Maksimov

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

  • Vladimir Kindra

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

  • Andrey Vegera

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

  • Andrey Rogalev

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

  • Nikolay Rogalev

    (Department of Thermal Power Plants, National Research University “Moscow Power Engineering Institute”, 111250 Moscow, Russia)

Abstract

Improvement of energy efficiency in technological processes at industrial enterprises is one of the key areas of energy saving. Reduction of energy costs required for the production of energy-intensive products can be achieved through the utilization of waste heat produced by high-temperature thermal furnace units. Generation of electric power based on the waste heat using power cycles with working fluids that are not conventional for large power engineering, may become a promising energy saving trend. In this paper, thermodynamic analysis and optimization of power cycles for the purposes of waste heat recovery are performed. The efficiency of combining several power cycles was also evaluated. It has been established that the combination of the Brayton recompression cycle on supercritical carbon dioxide with the organic Rankine cycle using R124 allows for greater electrical power than steam-power cycles with three pressure circuits under conditions where the gas temperature is in the range of 300–550 °C and the cooling temperature of is up to 80 °C. Additionally, when cooling gases with a high sulfur and moisture content to 150 °C, the combined cycle has greater electrical power at gas temperatures of 330 °C and above. At enterprises where the coolant has a high content of sulfur compounds or moisture and deep cooling of gases will lead to condensation, for example, at petrochemical and non-ferrous metallurgy enterprises, the use of combined cycles can ensure a utilization efficiency of up to 45%.

Suggested Citation

  • Igor Maksimov & Vladimir Kindra & Andrey Vegera & Andrey Rogalev & Nikolay Rogalev, 2024. "Thermodynamic Analysis and Optimization of Power Cycles for Waste Heat Recovery," Energies, MDPI, vol. 17(24), pages 1-27, December.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:24:p:6375-:d:1546829
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    References listed on IDEAS

    as
    1. 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.
    2. Li, Jinhu & Ye, Xinhao & Burra, Kiran G. & Lu, Wei & Wang, Zhiwei & Liu, Xuan & Gupta, Ashwani K., 2023. "Synergistic effects during co-pyrolysis and co-gasification of polypropylene and polystyrene," Applied Energy, Elsevier, vol. 336(C).
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