Passive acoustic detecting and positioning method for double-basic matrix data fusion power station boiler four-tube leakage

Abstract

The invention discloses a passive acoustic detecting and positioning method for the double-base matrix data fusion power station boiler four-tube leakage in the technical field of boiler pressure-bearing tube leakage and monitoring, which is used for solving the problems of narrow detection range, low precision, large error and difficult realization of a single acoustic matrix. The method comprises the following steps: arranging multilayer measuring points in a boiler, forming double basic matrixes by two adjacent layers of microphones and forming a square matrix by four microphones in each layer of microphones; calculating azimuth angles and pitch angles of the leakage positions corresponding to microphone arrays of quaternary square matrixes according to data measured by the microphone arrays; obtaining two adjacent sets of leakage position solutions and variances by using the calculated azimuth angles and pitch angles of the leakage positions of two adjacent of quaternary square matrix microphone arrays; and carrying out the weighted least-squares method fusion processing on the two adjacent sets of leakage position solutions and variances to obtain a leakage positioning solution of the double matrixes. The invention realizes the accurate positioning of a boil leakage source by using the coherency between redundant information of data and the arrays.

Description

technical field [0001] The invention belongs to the technical field of boiler pressure tube leakage monitoring, and in particular relates to a passive acoustic measurement and location method for four-tube leakage of a power station boiler with double matrix data fusion. Background technique [0002] The four boiler tubes of the thermal power generation unit include: water wall, superheater, reheater and economizer heating surface pipeline. Boiler four-tube leakage has always been a major problem that plagues the safe production of thermal power units. Early prediction of boiler four-tube burst is carried out to detect the leak in time before it develops into a destructive burst, and determine the location of the leak. It is of great significance for properly arranging shutdown, shortening maintenance time and reducing economic loss. [0003] At present, at home and abroad (see patent "Acoustic Leak Detection System", US4960079, "On-line Monitor for Boiler Pressure Tube Lea...

AI Technical Summary

Problems solved by technology

However, the detection range of a single acoustic array is small and the accuracy is low, especially its distance error is very large, sometimes it is almost impossible to achieve

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