Problems encountered during turbine startup?
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What are the reasons for increased shaft vibration during the startup of a turbine? How to avoid it? Low-speed warm-up speed: 800 revolutions! How long will it take?
The vibration starts to increase even when the speed is raised to 5000; is shaft vibration another possible cause?
Low-speed warm-up is divided into hot state and cold state; the cold-state period is slightly longer, while the hot-state period is appropriately shortened
What are the reasons for increased shaft vibration during the startup of a turbine? How to avoid it? Low-speed warm-up speed: 800 revolutions! How long will it take? Reasons for high vibration during startup: 1. Whether the pipe warming process is proper and whether the steam is superheated; 2. Whether the control of the turbine’s speed beyond its critical value is stable; 3. Whether the turbine’s dynamic balance is satisfactory. The time required for low-speed warming depends on whether the turbine is in a hot, semi-hot, or cold state; 800 RPM generally falls within the low-speed warming phase, and the acceleration curve should be referred to in this regard
The warm-up time is approximately 30 minutes; generally, it depends on the degree of expansion of the turbine, and the speed can only be increased once the required level of expansion is achieved
Is the expansion amount determined by that parameter? The detection parameters are shaft vibration, shaft displacement, and bearing temperature!
Low-speed warm-up requires 30 minutes, while hot start takes about 10 minutes
During the startup process of a turbine, the time required for warming up depends on the temperatures and degrees of expansion of various components, as well as whether the vibrations at each speed level are within acceptable limits; it is not closely related to the preheating time