Investigation of hold period influence on residual fatigue live in steam turbine shaft design

Abstract

Growth of share renewables in the field of electric power supplier and a lack of mechanism to cover shortage, force standard supplier of energy to stabilize the electrical grid. This situation is then demonstrated by increase of hot-start and cold-starts. But there is a lack for robust tool for qualitative assessment of residual life of the turbine shaft and for design of such a component. The goal of this paper is to present influence of the holding period on low-cycle fatigue (LCF), thermo-mechanical fatigue (TMF) and the so called Damage Operator Approach (DOA) by Nagode, which were used as a new approach for design of turbine shaft in Doosan Škoda Power.