On-line Fault Diagnosis of High Temperature Ceramic Filter Fracture Based on Dynamic Pressure

doi:10.3901/JME.2018.22.021

Abstract

Abstract: High temperature ceramic filters play a key role in the Shell coal gasification process and catalytic cracking. Ceramic filter tubes break owing to vibration by a pulse jet, start-up and shut down of the system, dust bridges between the tubes, diagnosing the breakage of these ceramic filter tubes on line is essential. During the process of pulse cleaning, high frequency sensors and multi-tube filtration performance experimental set-up are used to investigate dynamic pressure variation with the hole diameter of leakage in the inner wall of the filter. Feature parameters of dynamic pressure are extracted and normalized. The relationship between the dynamic pressure and the hole diameter of leakage is established for parameters represented by a weighted parameter. The accuracy of the model is verified through the experimental data. Furthermore, the time difference of the dynamic pressure measured by the high frequency sensor at different positions is measured, using normalized generalized cross-correlation functions, the location of the source signal model is established based on the time difference of arrival, and the leakage position of the ceramic filter tubes can be determined. Mutual coupling of both models, it can quickly and accurately determine whether ceramic filter tubes break, breaking location and number of the breaking ceramic filter tubes in the filter. This method provides some technical support for the stable operation of filter.

Key words: ceramic filters, dynamic pressure, fault diagnosis, feature parameter

CLC Number:

TQ028

LIU Longfei, JI Zhongli, LUAN Xin. On-line Fault Diagnosis of High Temperature Ceramic Filter Fracture Based on Dynamic Pressure[J]. Journal of Mechanical Engineering, 2018, 54(22): 21-29.

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