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Operational Improvements for Startup Time Reduction in Solar Steam Turbines

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Author

  • Monika Topel
  • Magnus Genrup
  • Markus Jocker
  • James Spelling
  • Bjorn Laumert

Summary, in English

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 lifting 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 (CD) temperatures and showed significant improvements on the startup times of the turbine.

Publishing year

2015

Language

English

Publication/Series

Journal of Engineering for Gas Turbines and Power

Volume

137

Issue

4

Document type

Journal article

Publisher

American Society Of Mechanical Engineers (ASME)

Topic

  • Energy Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 1528-8919