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Steam-electric generating set rotor thermal bending unbalance fault real time diagnostic method

A technology of steam turbine generator set and balancing fault, which is applied in the field of vibration state monitoring and fault diagnosis of rotating machinery, can solve the problems of high economic cost and long period of diagnosis, and achieves the effect of scientific method and reliable conclusion.

Inactive Publication Date: 2009-06-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The diagnosis of thermal bending faults of turbogenerator rotors is done by experienced experts, and the diagnostic cost is high and the period is long

Method used

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  • Steam-electric generating set rotor thermal bending unbalance fault real time diagnostic method
  • Steam-electric generating set rotor thermal bending unbalance fault real time diagnostic method
  • Steam-electric generating set rotor thermal bending unbalance fault real time diagnostic method

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Experimental program
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Embodiment

[0040] The method can realize the real-time monitoring, analysis and diagnosis of the thermal bending unbalance fault of the rotor of the steam turbine generator set. The relative vibration signal of the shaft of the turbo-generator set required by the diagnosis method and the key-phase signal required for the analysis and processing of the vibration signal can be obtained from the monitoring instrument (TSI) equipped with the turbo-generator set or from the professional vibration data acquisition and conditioning equipment. In this embodiment, the relative vibration signal of the shaft of the steam turbine generator set and the key phase signal required for analysis and processing of the vibration signal are obtained from professional vibration data acquisition and conditioning equipment connected to the vibration sensor. The schematic diagram of the monitoring of the thermal bending unbalance fault of the rotor of the steam turbine generator set is as follows: figure 1 As sh...

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Abstract

The invention discloses a real time diagnosing method for turbo unit rotor thermal bending malfunctions. The method processes the calculation, analysis and judgments for the vibrating data via collecting the rotor vibrating signals of the turbo unit; and the method processes the real-time calculation of storage on both sides of the rotor shaft relative vibration frequency of vibration amplitude and phase values, and real-time axis vibration frequency of vibration amplitude in real-time authentication, determine any side of the rotor shaft vibration amplitude of the vibration frequency is greater than the vibration amplitude threshold. Then the method is combined with least square method, based on the axial vibration frequency of vibration data axis vibration frequency of the vibration amplitude of the trend of flat-based authentication and shaft vibration frequency vibration phase of verification, such as the trend of moderate real-time quantitative calculation and analysis. Calculated in real-time quantitative analysis based on the combined results of the verification, automatic real-time diagnosis of whether units imbalance rotor thermal bending failure. The invention has the advantages of scientific method; reliable conclusions can automatically real-time online monitoring, fault diagnosis and so on.

Description

technical field [0001] The invention belongs to the field of rotating machinery vibration state monitoring and fault diagnosis, and in particular relates to a real-time diagnosis method for rotor thermal bending unbalance faults of a large-scale steam turbine generator set for real-time online automatic monitoring of the vibration state of a large-scale steam turbine generator set. Background technique [0002] The bending deformation of the steam turbine rotor after being heated is called thermal bending, and the thermal bending will lead to the change of the rotor equilibrium state, so the thermal bending also becomes the thermal unbalance. Thermal bending is a relatively common vibration phenomenon, and there are various reasons for thermal bending. Defects in rotor material can cause thermal warping. The uneven material causes uneven expansion after heating, causing the rotor to be thermally bent; the residual stress of the rotor during the manufacturing process, the st...

Claims

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Application Information

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IPC IPC(8): G01M1/22
Inventor 宋光雄
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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