Operational Improvements for Startup Time Reduction in Solar Steam Turbines

Research output: Contribution to journalArticle

Standard

Operational Improvements for Startup Time Reduction in Solar Steam Turbines. / Topel, Monika; Genrup, Magnus; Jocker, Markus; Spelling, James; Laumert, Bjorn.

In: Journal of Engineering for Gas Turbines and Power, Vol. 137, No. 4, 042604, 2015.

Research output: Contribution to journalArticle

Harvard

APA

CBE

MLA

Vancouver

Author

Topel, Monika ; Genrup, Magnus ; Jocker, Markus ; Spelling, James ; Laumert, Bjorn. / Operational Improvements for Startup Time Reduction in Solar Steam Turbines. In: Journal of Engineering for Gas Turbines and Power. 2015 ; Vol. 137, No. 4.

RIS

TY - JOUR

T1 - Operational Improvements for Startup Time Reduction in Solar Steam Turbines

AU - Topel, Monika

AU - Genrup, Magnus

AU - Jocker, Markus

AU - Spelling, James

AU - Laumert, Bjorn

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

U2 - 10.1115/1.4028661

DO - 10.1115/1.4028661

M3 - Article

VL - 137

JO - Journal of Engineering for Gas Turbines and Power

T2 - Journal of Engineering for Gas Turbines and Power

JF - Journal of Engineering for Gas Turbines and Power

SN - 1528-8919

IS - 4

M1 - 042604

ER -