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Comparative study of a bottoming SRC and ORC for Joule–Brayton cycle cooling modular HTR exergy losses, fluid-flow machinery main dimensions, and partial loads

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  • Kowalczyk, Tomasz
  • Badur, Janusz
  • Ziółkowski, Paweł

Abstract

Energy conversion efficiency increase in power plants with high-temperature gas-cooled reactors via implementation of the bottoming cycle was investigated under nominal and minimal thermal load of a high-temperature reactor (HTR). Heat transfer surface area and turbine outlet volumetric flow rate in bottoming cycles was also investigated. Water and two low-boiling point working fluids (ammonia and ethanol) were analyzed. Analyzed thermodynamic cycles consisted of a closed Joule-Brayton cycle with helium as working medium, which was investigated in configurations with heat regeneration, compressor intercoolers, and in a simple design. Organic versus steam Rankine cycles were compared; low-boiling point fluids under supercritical conditions in some configurations provide higher cycle energy efficiency than the gas-steam cycle. Volumetric flow rates in the last turbine stages were reduced against the steam turbine to 38% and 0.8% with ethanol and ammonia, respectively. The steam Rankine cycle configuration provided the smallest heat transfer surface increase compared with the base cycle.

Suggested Citation

  • Kowalczyk, Tomasz & Badur, Janusz & Ziółkowski, Paweł, 2020. "Comparative study of a bottoming SRC and ORC for Joule–Brayton cycle cooling modular HTR exergy losses, fluid-flow machinery main dimensions, and partial loads," Energy, Elsevier, vol. 206(C).
    • Handle: RePEc:eee:energy:v:206:y:2020:i:c:s0360544220311798
    DOI: 10.1016/j.energy.2020.118072
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    References listed on IDEAS

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    1. Ziółkowski, Paweł & Badur, Janusz & Ziółkowski, Piotr Józef, 2019. "An energetic analysis of a gas turbine with regenerative heating using turbine extraction at intermediate pressure - Brayton cycle advanced according to Szewalski's idea," Energy, Elsevier, vol. 185(C), pages 763-786.
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    3. Mikielewicz, Dariusz & Wajs, Jan & Ziółkowski, Paweł & Mikielewicz, Jarosław, 2016. "Utilisation of waste heat from the power plant by use of the ORC aided with bleed steam and extra source of heat," Energy, Elsevier, vol. 97(C), pages 11-19.
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    Cited by:

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    2. Hyrzyński, Rafał & Ziółkowski, Paweł & Gotzman, Sylwia & Kraszewski, Bartosz & Ochrymiuk, Tomasz & Badur, Janusz, 2021. "Comprehensive thermodynamic analysis of the CAES system coupled with the underground thermal energy storage taking into account global, central and local level of energy conversion," Renewable Energy, Elsevier, vol. 169(C), pages 379-403.
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