What is Turbine Differential Expansion?

[KimberlyAnn]

Turbine differential expansion refers to the relative expansion between the turbine rotor and the cylinder. During turbine startup, as the temperature rises, both the rotor and the cylinder expand based on their respective fixed points. The cylinder has a large mass and contacts steam on one side, resulting in slower expansion, while the rotor has a smaller mass and rotates within the steam, leading to faster expansion. Related information: 1. Types of differential expansion: Based on cylinder classification, it can be divided into high differential, intermediate differential, low I differential, and low II differential. 2. Causes of excessive differential expansion: During startup, insufficient warm-up time, rapid speed increase or load increase, low heating steam temperature or low flow rate in the cylinder interlayer and flange heating devices, resulting in weak heating effects.