Method for predicting residual life of grinding roller bearing of coal mill

Abstract

The invention relates to a method for predicting the residual life of a grinding roller bearing of a coal mill. The method comprises the steps of 1), collecting the vibration related parameters of the grinding roller bearing in an operation fault state of the coal mill, and screening the collected real-time data, 2) performing fault feature extraction of the grinding roller bearing on the screened data, and obtaining an optimal resonance frequency band so as to realize fault diagnosis, (3) obtaining the degeneration state of the grinding roller bearing, dividing the degeneration stage of the grinding roller bearing, and extracting the characteristic index of bearing degeneration, and 4) adopting a bidirectional LSTM neural network to establish a grinding roller bearing residual life prediction model, and when the grinding roller bearing begins to degrade, taking the characteristic index of bearing degradation as model input to predict the residual life of the grinding roller bearing. Compared with the prior art, the method has the advantages of effectively realizing fault diagnosis of the grinding roller bearing of the coal mill, having good degradation trend prediction capability and the like.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a method for predicting the remaining life of a grinding roller bearing of a coal mill. Background technique [0002] As an important auxiliary equipment for thermal power units, coal mill is also the core of the boiler pulverization system, and its operating status directly affects the stable operation of the unit. ZGM113-type roller coal mill has the advantages of long maintenance period, stable output and low noise, and has been widely used in coal-fired power plants. The coal mill uses grinding rollers to grind the material passing through the annular groove of the grinding disc into coal powder, and the qualified fine powder is sent into the furnace for combustion along with the airflow. However, due to the complex composition of the material to be ground by the grinding roller, it may be mixed with impurities such as iron, wood, stone, etc., resulting in a...

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Problems solved by technology

In the studies of the above two documents, the specific reasons for the wear of the grinding rollers were analyzed through on-site fluid dynamic tests, and corresponding solutions were given for the wear of the grinding rollers of the ZGM113G coal mill, but there was no Carry out specific research on the wear of grinding roller bearings, and do not analyze the fault characteristics of the bearing itself

In addition, the above-mentioned documents only carried out transformation on the main body of the coal mill, and did not study the remaining service life prediction model of the grinding roller bearings, so it was impossible to estimate the time for overhauling the grinding rollers and replacing the bearings, resulting in potential safety hazards

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