A fault determination method for turbine oil film whirling vibration
A technology for turbine oil and fault judgment, which is applied in engine testing, mechanical component testing, machine/structural component testing, etc., and can solve problems such as vicious accidents, disintegration, and amplitude rise
Active Publication Date: 2021-05-18
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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Problems solved by technology
Moreover, if the oil film eddy cannot be treated in a timely manner, it is likely to develop into an oil film shock. The destructive power of the oil film shock is extremely high, and the amplitude rises in a divergent trend, which is likely to cause damage or even disintegration of the equipment, resulting in a vicious accident.
However, at present, the judgment of oil film whirl vibration faults can only be carried out by experts with rich experience, and there is no simple, effective and reliable judgment method
This has caused great inconvenience to the safe operation and maintenance of the power plant
Method used
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[0038] Take the vibration fault treatment of No. 1 bearing of No. 4 unit of a power plant as an example. The vibration of the bearing increased during operation.
[0039] The first step is to use professional instruments to test the vibration data of the unit in the X and Y directions in the working state, and generate a spectrogram. This process is completed by professional software.
[0040] The second step is to perform spectrum analysis according to the spectrogram. It is found that there is a large vibration component at the frequency of 25Hz in both X and Y directions, of which the X-direction vibration component is 56 μm and the general frequency amplitude is 83 μm; the Y-direction vibration component is 45 μm and the general frequency amplitude is 78 μm. The proportions were 67% and 58%, both exceeding 20%. The operating frequency of the unit is 50Hz, and 25Hz is exactly 0.5 times the frequency. Based on the above two points, it is determined that the unit may have t...
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The present invention relates to a steam turbine oil film vortex vibration fault determination method, comprising the following steps: (1) collecting vibration data; (2) performing frequency spectrum analysis; (3) speed-up and down-speed vibration test; (4) speed-up and down-speed vibration data analysis; Analysis of oil temperature test data. The present invention designs the test of rising and falling speed and the test of changing oil temperature to determine the fault of vortex vibration of oil film, which greatly improves the accuracy of judgment. The judgment process is simple, fast and effective. It does not depend on experience, and any worker can complete it according to the method. Judgment can be a good guide for production application.
Description
technical field [0001] The invention belongs to the technical field of steam turbine detection, in particular to a method for judging a steam turbine oil film eddy vibration fault. Background technique [0002] The problem of excessive vibration will occur during the operation of the steam turbine. The standard stipulates that the bearing vibration of the steam turbine generator set with a capacity of 300MW and above needs to be dealt with if the vibration exceeds 120μm. It is also excessive vibration, but there may be various reasons. If you want to carry out effective treatment, you first need to analyze and judge the cause of excessive vibration. Only after the cause is determined can you carry out targeted treatment. [0003] Among the various reasons that cause the excessive vibration of the steam turbine, the oil film whirl is a kind of fault type that is difficult to determine. Because its fault characteristics are relatively close to steam flow excitation and fricti...
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IPC IPC(8): G01M15/00G01M13/00
CPCG01M13/00G01M15/00
Inventor 屈斌张利王建李国豪王梓越周连升甘智勇王坤
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO