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

Topel, Monika; Genrup, Magnus LU ; Jocker, Markus; Spelling, James and Laumert, Bjorn (2014) ASME Turbo Expo: Turbine Technical Conference and Exposition In Proceedings of the ASME Turbo Expo: Turbine Technical Conference And Exposition, 2014, Vol 5C p.05-20
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... (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 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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Proceedings of the ASME Turbo Expo: Turbine Technical Conference And Exposition, 2014, Vol 5C
pages
05 - 20
publisher
Amer Soc. Mechanical Engineers
conference name
ASME Turbo Expo: Turbine Technical Conference and Exposition
external identifiers
  • WOS:000362139600066
  • Scopus:84922183089
DOI
10.1115/GT2014-27065
language
English
LU publication?
yes
id
994712f1-5798-4e87-8307-eb6bbce5500a (old id 8227455)
date added to LUP
2015-11-27 12:40:31
date last changed
2016-10-13 04:44:18
@misc{994712f1-5798-4e87-8307-eb6bbce5500a,
  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.},
  author       = {Topel, Monika and Genrup, Magnus and Jocker, Markus and Spelling, James and Laumert, Bjorn},
  language     = {eng},
  pages        = {05--20},
  publisher    = {ARRAY(0x51514b8)},
  series       = {Proceedings of the ASME Turbo Expo: Turbine Technical Conference And Exposition, 2014, Vol 5C},
  title        = {Operational Improvements for Start-Up Time Reduction in Solar Steam Turbines},
  url          = {http://dx.doi.org/10.1115/GT2014-27065},
  year         = {2014},
}