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

Grzegorz Nowak, Andrzej Rusin, Henryk Łukowicz and Martyna Tomala

Energy, 2020, vol. 198, issue C

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.

Keywords: Steam turbine; Start-up; Optimization; Thermal stress (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544220304102
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:198:y:2020:i:c:s0360544220304102

DOI: 10.1016/j.energy.2020.117303

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().