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Improving the power unit operation flexibility by the turbine start-up optimization

Author

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  • Nowak, Grzegorz
  • Rusin, Andrzej
  • Łukowicz, Henryk
  • Tomala, Martyna

Abstract

This paper is focused on the optimization of turbine start-up. Thermal and strength analyses are conducted for the HP part rotor using the FEM for boundary conditions varying in time and space. The optimization is carried out using the RSM-GA approach. A sensitivity analysis is also performed for the steam parameters in individual stages of the start-up process. The testing results indicate that maximum stress values in the start-up initial stage are considerably affected not only by the steam-metal temperature difference but also by the temperature distribution in the element. Even if classed within the same category, start-ups differ substantially in the duration of downtimes and, consequently, in the level and distribution of initial temperature. It is therefore recommended that the start-up analysis should be preceded by a simulation of the cooling process. The optimization resulted in new start-up curves that make it possible to run the entire start-up process in less than half of the previous. Two stress maxima are observed during the start-up procedure. If the steam initial temperature is appropriately selected to the temperature of the rotor, the start-up duration is most affected by the rate at which the process is run in the final stage.

Suggested Citation

  • Nowak, Grzegorz & Rusin, Andrzej & Łukowicz, Henryk & Tomala, Martyna, 2020. "Improving the power unit operation flexibility by the turbine start-up optimization," Energy, Elsevier, vol. 198(C).
  • Handle: RePEc:eee:energy:v:198:y:2020:i:c:s0360544220304102
    DOI: 10.1016/j.energy.2020.117303
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    References listed on IDEAS

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    Cited by:

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    6. Rusin, Andrzej & Nowak, Grzegorz & Łukowicz, Henryk & Kosman, Wojciech & Chmielniak, Tadeusz & Kaczorowski, Maciej, 2021. "Selecting optimal conditions for the turbine warm and hot start-up," Energy, Elsevier, vol. 214(C).

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