Stability of the Thermal-Expansion System of a Steam Turbine Against External Factors

Resumo

The results of studying design causes of malfunctions of the thermal-expansion system (TES) in steam turbines are presented. Simulation is performed to show the effect of the clearances in the keyed joints on the probability of bearing seizure in the longitudinal keys. Possible contacts between the longitudinal key and the groove in the bearing are considered. It is proved that the increase in the clearances in transverse keyed joints during turbine operation increases the probability of seizure. For reliable operation of the TES, it is necessary to restore the clearances during each overhaul.