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Method for distinguishing unreal rotating shaft vibration signals of steam turbine generator unit

A steam turbine generator set, vibration signal technology, applied in the testing of mechanical parts, the testing of machine/structural parts, measuring devices, etc. Report and reduce the effect of unplanned downtime

Inactive Publication Date: 2019-04-09
北京振测智控科技有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Vibration measurement is highly professional, and it is difficult to analyze the cause of abnormal vibration. Sometimes it is not clear whether the abnormal vibration reflects the real vibration of the rotating shaft or comes from other influencing factors, resulting in a stop that should be stopped for treatment but not stopped, which will magnify the accident; or It can be stopped for a long time without shutting down for repeated maintenance, which wastes manpower and material resources
Because the real vibration level of the unit cannot be known in time, the abnormal vibration treatment method adopted is not suitable for the actual situation, causing serious economic losses and adverse social impacts

Method used

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  • Method for distinguishing unreal rotating shaft vibration signals of steam turbine generator unit
  • Method for distinguishing unreal rotating shaft vibration signals of steam turbine generator unit
  • Method for distinguishing unreal rotating shaft vibration signals of steam turbine generator unit

Examples

Experimental program
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Effect test

Embodiment 330

[0037] This embodiment takes a 330MW turbogenerator set as an example. The set is composed of a high-voltage rotor, a medium-pressure rotor, a low-pressure rotor and a generator rotor. Each bearing is equipped with X-direction and Y-direction eddy current sensors to measure the relative vibration of the shaft. On-line vibration monitoring and analysis system. The unit was started after overhaul. During the start-up process, as the speed increased, the vibration gradually increased. At about 2400r / min, the vibration of the 2# bearing (rear bearing of the high-pressure rotor) in the X direction increased rapidly, and the frequency spectrum was mainly 3.81 multiplied. Such as figure 2 As shown, the vibration in the Y direction is normal, which is in line with logic 5: the vibration signals of two eddy current sensors on the same bearing, one of which has a non-integer high frequency vibration, is not the real vibration of the rotor. According to the analysis, resonance occurred...

Embodiment 600

[0039] This embodiment takes a 600MW turbogenerator set as an example. The set is composed of a high-voltage rotor, a medium-pressure rotor, two low-pressure rotors and a generator rotor. There are 10 bearings in total, and each bearing is equipped with X-direction and Y-direction eddy current sensors. To measure vibration, the unit is equipped with an online vibration monitoring and analysis system. When the unit is about to be overhauled, the X- and Y-direction vibrations of the 9# bearing (the front bearing of the generator rotor) gradually increase, and the frequency spectrum is dominated by double frequency. In the bearing vibration diagram, such as image 3 As shown, it can be seen that the amplitude changes continuously along the circumferential direction, which is the real vibration of the rotor. Although the Y-direction vibration is obviously greater than the X-direction vibration, and the maximum amplitude has exceeded the dangerous value, but because the protection...

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Abstract

The invention discloses a method for distinguishing unreal rotating shaft vibration signals of a steam turbine generator unit, which comprises the steps of collecting vibration signals by using an electric eddy-current sensor installed on each bearing of the unit, and performing the time domain analysis and the frequency domain analysis; establishing the characteristic data for identifying the authenticity of the abnormal vibration.; and according to the rotor dynamics, vibration fault mechanism and information fusion technologies, and combined with field experience, establishing the judgmentlogic of identifying the authenticity of abnormal vibration to determine whether the abnormal vibration is the real vibration state of the rotating shaft or not. If the abnormal vibration is not the real vibration state, measures are taken to eliminate the abnormal vibration and prevent the harm caused by the unreal rotor vibration data. The method can eliminate the false and preserve the true, overcome the shortcoming of setting the logic combination of vibration protection only by amplitude, reduce the false alarm and missing alarm, and provide an important guarantee for the safe and economic operation of the unit.

Description

technical field [0001] The invention relates to the technical field of vibration measurement of a steam turbine generator set, in particular to a method for distinguishing non-real shaft vibration signals of a steam turbine generator set. Background technique [0002] At present, large turbogenerators generally install two eddy current sensors on each bearing to measure the vibration of the rotor relative to the bearing seat, and use it as the main basis for evaluating the vibration level of the unit. my country's thermal power units generally stipulate that when the rated speed is 3000r / min, the relative shaft vibration is less than 76μm, which is excellent, and if it is greater than 125μm, it will alarm, and if it is greater than 250μm, it is dangerous and needs to be shut down. [0003] Each steam turbine generator set is equipped with a steam turbine safety monitoring system, and most of the units are also equipped with an online vibration monitoring and analysis fault d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/045
CPCG01M13/045
Inventor 阮跃
Owner 北京振测智控科技有限公司
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