A method for identifying and locating boiler tube leaks

Abstract

The invention discloses a boiler pipe leakage identification and positioning method. A data acquisition card is adopted to complete analog-to-digital conversion after four sensors through phase congruency acquire sound signals, one-time sampling is carried out for every 10 thousand data points, the sampling point is set to be a monitoring point, secondary discrete signals are obtained, discrete Fourier transform is carried out on the secondary discrete signals to obtain a sound frequency value of each monitoring point, an alarming frequency threshold is set to be 10 KHZ, the sound frequency value of each monitoring point is compared with the alarming frequency threshold, if not, sampling and comparison are continued, if not, a sound pressure level is further calculated, an alarm is given, abnormal data are written to a temporary Excel sheet, data in the temporary Excel sheet are read through MATLAB, a time delay value is solved by using a cross-correlation algorithm, the time delay value is finally substituted to a positioning program, the sound source position of the boiler pipe can thus be accurately identified, the leakage point of the boiler pipe is determined, wrong reporting is not likely to happen, the accuracy is high, the leakage identification and the leakage alarming are automatic, and manual error and delay do not exist.

Description

Technical field [0001] The present invention relates to the technical field of information processing, in particular to a method for identifying and positioning boiler tube leakage. Background technique [0002] At present, the leak detection devices installed in power plants are all regional in positioning the leak points of the boiler tubes, and the exact location of the leak points cannot be given, which makes it difficult to repair the leak points when the boiler is shut down. At the same time, the leak detection device uses four sensors. Although the method of planar square array positioning is simple and economical, the number of sensor groups is small, and the constraints when solving equations are also reduced, which in turn leads to large positioning errors or incorrect positioning at certain special sound source positions (coordinate axis , Or a special location at a distant point). Summary of the invention [0003] The technical problem solved by the present invention ...

AI Technical Summary

Problems solved by technology

[0002] At present, the leak detection device installed in the power plant can only locate the leak point of the boiler tube regionally, and cannot give the exact location of the leak point, which makes it difficult to repair the leak point when the boiler is shut down; at the same time, the leak detection device is composed of four sensors. Although the positioning method of the plane square array is simple and economical, the number of sensor groups is small, and the constraints when solving the equation are also reduced, which leads to large positioning errors or wrong positioning at some special sound source positions (coordinate axis , or the far point is a special position)

Images