Method and system for eliminating impact and rub failure of low-pressure shaft seals of turbine

Abstract

The invention discloses a method and system for eliminating the impact and rub failure of low-pressure shaft seals of a turbine. The method comprises the step that in the starting process of the turbine, a cooling system of the turbine is started, so that cooling is conducted on steam exhaust cones of a low-pressure cylinder of the turbine. The temperatures of the steam exhaust cones are lowered,the temperatures of the low-pressure shaft seals arranged on the steam exhaust cones are lowered, and thus, deformation of the low-pressure shaft seals is reduced; inclination of the low-pressure shaft seals is restrained; and the reduction amount of a gap in the bottom of each low-pressure shaft seal is reduced, and thus, the problem that in the starting process of the turbine, the impact and rubfailure occurs due to temperature variation of the shaft seals is avoided. The method is simple and easy to implement; the improvement measures are obvious in effect; and after improvement, the flowinfluence of steam inside the turbine is extremely small.

Description

technical field [0001] The invention relates to the technical field of steam turbine generators, in particular to a method and system for eliminating friction failures of low pressure shaft seals of steam turbines. Background technique [0002] Dynamic and static rubbing of turbogenerator unit components is the most common type of fault on site, but it is very difficult to diagnose accurately. The uncertainty of rubbing faults increases the difficulty of on-site diagnosis and treatment. For steam turbines, the low-pressure cylinder has a high probability of rubbing, and operating experience shows that the parts where rubbing occurs are mainly concentrated at the shaft seal of the unit. When rubbing occurs, the light one will cause the unit to vibrate strongly, and the serious one will even cause the entire shafting to be destroyed. For this reason, it is necessary to accurately judge the cause of rubbing by advanced means, and take effective measures to deal with the fault ...

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Problems solved by technology

[0003] For nuclear power units using half-speed, on-site operation and commissioning data show that it is common for low-pressure cylinders to collide during vacuuming, but collapsing faults are more complicated, and collapsing involves many reasons, and the on-site treatment effect is highly random

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