An acoustic emission sensor, a method of monitoring a damage frequency range, a catalytic cracking device and a hydrogenation device

Abstract

The application discloses an acoustic emission sensor, a method for monitoring a damage frequency range, a catalytic cracking device and a hydrogenation device, and belongs to the technical field of acoustic emission monitoring of petrochemical equipment. The acoustic emission sensor comprises a shell, and a coupling surface, an array piezoelectric wafer and a mass block are sequentially arranged in the shell from bottom to top. A negative electrode surface of the array piezoelectric wafer is pasted on a base by conductive glue, and a positive electrode surface is connected with a core wire of a high-frequency socket through a lead wire. The array piezoelectric wafer is composed of n piezoelectric wafers, a frequency response range of an mth piezoelectric wafer is Xm-Xm', wherein m belongs to (1, n); Xm and Xm' are sequentially increased with the increase of m, and Xm+1Xm', and a resonance frequency X* of each piezoelectric wafer is sequentially increased. The acoustic emission sensor is sensitive to sound waves of active defects of damage, has low cost and low noise, can be used as a flexible probe, is suitable for the technical field of acoustic emission monitoring of process equipment damage, improves the sensitivity of monitoring of active defects of damage, and guarantees safe operation.

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