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Operational Improvements for Startup Time Reduction in Solar Steam Turbines

Topel, Monika; Genrup, Magnus LU ; Jocker, Markus; Spelling, James and Laumert, Bjorn (2015) In Journal of Engineering for Gas Turbines and Power 137(4).
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 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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Engineering for Gas Turbines and Power
volume
137
issue
4
publisher
American Society of Mechanical Engineers
external identifiers
  • wos:000350145500024
  • scopus:84940473273
ISSN
1528-8919
DOI
10.1115/1.4028661
language
English
LU publication?
yes
id
963c5db5-f14d-4835-9bbc-b657c73d3a21 (old id 5300393)
date added to LUP
2015-04-27 09:58:58
date last changed
2017-09-24 03:04:02
@article{963c5db5-f14d-4835-9bbc-b657c73d3a21,
  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 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.},
  articleno    = {042604},
  author       = {Topel, Monika and Genrup, Magnus and Jocker, Markus and Spelling, James and Laumert, Bjorn},
  issn         = {1528-8919},
  language     = {eng},
  number       = {4},
  publisher    = {American Society of Mechanical Engineers},
  series       = {Journal of Engineering for Gas Turbines and Power},
  title        = {Operational Improvements for Startup Time Reduction in Solar Steam Turbines},
  url          = {http://dx.doi.org/10.1115/1.4028661},
  volume       = {137},
  year         = {2015},
}