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Operational Improvements for Start-Up Time Reduction in Solar Steam Turbines

[+] Author Affiliations
Monika Topel, James Spelling, Björn Laumert

Royal Institute of Technology, Stockholm, Sweden

Magnus Genrup

Lund University, Lund, Sweden

Markus Jöcker

Siemens Industrial Turbomachinery AB, Finspong, Sweden

Paper No. GT2014-27065, pp. V05CT20A008; 10 pages
doi:10.1115/GT2014-27065
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 5C: Heat Transfer
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4573-8
  • Copyright © 2014 by ASME

abstract

Solar steam turbines are subject to high thermal stresses as a result of temperature gradients during transient operation, which occurs more frequently due to the variability of the solar resource. In order to increase the flexibility of the turbines while preserving lifing requirements, several operational modifications for maintaining turbine temperatures during offline periods are proposed and investigated. The modifications were implemented in a dynamic thermal turbine model and the potential improvements were quantified. The modifications studied included: increasing the gland steam pressure injected to the end-seals, increasing the back pressure and increasing the barring speed. These last two take advantage of the ventilation and friction work. The effects of the modifications were studied both individually as well as in different combinations. The temperatures obtained when applying the combined modifications were compared to regular turbine cool-down temperatures and showed significant improvements on the start-up times of the turbine.

Copyright © 2014 by ASME

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