What damages can vibration in a running turbine cause?
Thread Content
Vibration of a running turbine can cause the following hazards: (1) Wear of some shaft seals on the low-pressure side, resulting in a loss of sealing efficiency and air leakage into the low-pressure cylinder, which affects the vacuum level； The shaft seal on the high-pressure side is worn, resulting in an increased amount of steam leakage from the high-pressure cylinder. This causes localized heating of the rotor, leading to bending, and the steam enters the bearing oil, causing it to emulsify. (2) Severe wear of the diaphragm steam seal will increase the steam leakage between stages; apart from affecting efficiency, it will also increase the axial thrust, leading to the melting of the tungsten alloy in the thrust bearings. (3) When the sliding wear is severe, it affects the normal thermal expansion of the unit, thereby causing other accidents. (4) Breakage of the tungsten alloy in the bearing bush, and loosening or breaking of the securing screws. (5) A decrease in the fatigue strength of the rotating parts will cause damage to blades, discs, etc. (6) Loose or damaged components of the generator and exciter. (7) The speed control system is unstable.
(1) Wear of some shaft seals on the low-pressure side leads to a loss of sealing efficiency, allowing air to leak into the low-pressure cylinder and affecting the vacuum level. Wear of some shaft seals on the high-pressure side increases the amount of steam leaking out from the high-pressure cylinder, causing localized heating of the rotor and resulting in its bending. Steam also enters the bearing oil, leading to the emulsification of the oil. 2) Severe wear of the diaphragm steam seal will increase the steam leakage between stages; this not only affects efficiency but also increases the axial thrust, leading to the melting of the tungsten alloy in the thrust bearings. 3) When the sliding wear is severe, it affects the normal thermal expansion of the unit, thereby causing other accidents. (4) Breakage of the tungsten alloy in the bearing bush, and loosening or breaking of the securing screws. (5) A decrease in the fatigue strength of the rotating parts will cause damage to blades, discs, etc. (6) Loose or damaged components of the generator and exciter. (7) The speed control system is unstable.