2017

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Rotor heating conditions influence on the thermostructural state and lifetime of the 325 MW steam turbineduring start-ups
(НТУ "ХПІ", 2017) Bakhmutska, Ju. O.; Goloshchapov, V. M.; Kochurov, Roman
Thermal and thermostructural study for the 325 MW steam turbine high pressure cylinder rotor during pre-warming phase and cold start-up has been performed. To determine rotor transient thermal state with highest accuracy, the improved methodology was developed. According the approach, steam characteristics in rotor flow path and end seals regions have been calculated taking into the account leakages through drainages and specificity of turbine heating through exhaust hood. The highest accuracy of the method was provided by realistic prediction of the condensation process on rotor surfaces and simulation of the convection heating conditions taking to the account condensation influence. Based on the study, the front-end seals design changes and pre-warming process modification have been proposed. The thermostructural and lifetime analyses results for the baseline and modified designs have been presented and discussed in the article.