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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. Stanek, Wojciech & Czarnowska, Lucyna & Pikoń, Krzysztof & Bogacka, Magdalena, 2015. "Thermo-ecological cost of hard coal with inclusion of the whole life cycle chain," Energy, Elsevier, vol. 92(P3), pages 341-348.
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    4. Kruk-Gotzman, Sylwia & Ziółkowski, Paweł & Iliev, Iliya & Negreanu, Gabriel-Paul & Badur, Janusz, 2023. "Techno-economic evaluation of combined cycle gas turbine and a diabatic compressed air energy storage integration concept," Energy, Elsevier, vol. 266(C).

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