Vibration fault diagnosis method for medium-speed coal mill

Abstract

The invention discloses a vibration fault diagnosis method for a medium-speed coal mill and belongs to the coal mill fault diagnosis method technical field. According to the method, fault characteristic analysis is carried out the vibration of the coal mill, so that obtained current of the coal mill is an important monitoring parameter of the vibration fault analysis of the coal mill; four auxiliary variables, namely, the wind pressure of the outlet of a mill, the coal feed quantity of a coal feeder, the primary air quantity of the inlet of the mill, and the temperature of the outlet of the mill, are screened out through the correlation analysis of historical data; the current is predicted through the four variables; and the difference of actually-measured current and the predicted current is obtained; the current residual sequence of the coal mill is adopted to construct the vibration quantity of the coal mill; three-level wavelet packet decomposition is carried out the current residual sequence of the coal mill, so that the energy ratio of eight frequency bands can be obtained; and the energy ratio of two kinds of faults is statistically analyzed, so that the characteristic quantities of a fault that the abrasion of a grinder roller is serious, and a fault that fed objects in the coal mill are abnormal, can be distinguished obviously. The diagnosis method has the advantages of high diagnostic accuracy and good test effect.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis methods for coal pulverizers, in particular to a vibration fault diagnosis method for medium-speed coal pulverizers. Background technique [0002] The large vibration of the coal mill is a type of fault that is very harmful to the safe and stable operation of the unit. The occurrence of a large vibration fault will cause a series of problems: 1) The connecting parts of the coal mill body are loose; 2) The foundation of the coal mill has large vibration It may cause the vibration of the steam pump to increase; 3) The seal of the tie rod is damaged, powder leakage occurs and even the tie rod breaks. There are many possible reasons for the major vibration failure of the coal mill: 1) Coal breakage in the coal mill; 2) Breakage of the lining tile of the grinding disc; 3) Foreign matter (mostly three pieces) in the mill; 4) Serious wear of the grinding roller Wait. However, after investigatio...

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Problems solved by technology

[0002] The large vibration of the coal mill is a type of fault that is very harmful to the safe and stable operation of the unit. The occurrence of a large vibration fault will cause a series of problems: 1) The connecting parts of the coal mill body are loose; 2) The foundation of the coal mill has large vibration It may cause the vibration of the steam pump to increase; 3) The seal of the tie rod is damaged, powder leakage occurs and even the tie rod breaks

There are many possible reasons for the major vibration failure of the coal mill: 1) Coal breakage in the coal mill; 2) Breakage of the lining tile of the grinding disc; 3) Foreign matter (mostly three pieces) in the mill; 4) Serious wear of the grinding roller Wait

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