Method for reducing oil film oscillation harm

Abstract

The invention provides a method for reducing the oil film oscillation harm of a steam turbine generator. The vibration harm caused by oil film oscillation can be reduced. The method mainly comprises the three steps that firstly, a lower-inlet and upper-outlet lubricating oil supply pump is designed and selected, and a lower-inlet and lower-outlet oil supply pump or an upper-inlet and lower-outlet type oil supply pump is not adopted, so that air entrainment in lubricating oil caused by air suffocation and air clogging in the oil supply pump is avoided; secondly, in the design and arrangement of a lubricating oil conveying pipeline, the lubricating oil conveying pipeline is arranged in a mode of only ascending and not descending in the flowing direction, and an upward convex pipeline design is not adopted, so that the situation that gas is suffocated in the upward convex part and mixed in the lubricating oil to be conveyed to a bearing is avoided; and thirdly, the lubricating oil is frequently filtered so as to reduce the content of solid particles and bubbles carried by the solid particles, and the lubricating oil is heated before startup to reduce the bubble content.

Description

technical field [0001] The invention relates to a method for alleviating the harm of oil film oscillation, which aims to avoid oil film oscillation or reduce its harm in the design, operation and maintenance of oil-lubricated bearings of turbo-generators and hydro-generators, and belongs to turbo-generators and hydro-generators technology field. Background technique [0002] In the operation of turbogenerators, vibration problems caused by oil film oscillation are often encountered, which not only affects the safety of power stations due to large vibrations, but also often leads to bearing damage. In some hydropower stations and pumped storage power stations, the problem of oil film oscillation is also encountered, resulting in bearing wear or cracking. [0003] Turbine-generator oil film oscillation refers to the bearing bush vibration that occurs when the speed of the turbo-generator is higher than twice the first critical speed of the rotor, and occurs during the start-u...

AI Technical Summary

Problems solved by technology

Severe oil film oscillations often cause bearing bush burnout, the unit cannot operate normally, and frequent abnormal shutdowns are very harmful to the safe and stable operation of the power station

[0004] In order to solve this technical problem, a lot of research work has been carried out at home and abroad, but the cause of its occurrence has not been clarified. Although the proposed control measures and methods have some effects, they cannot be further expanded due to lack of pertinence and unclear reasons for their effectiveness. and popularization, similar faults and accidents still occur frequently, and similar bearing bush cracking accidents often occur in hydropower stations

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