A method to improve the accuracy of acoustic leak detection in coal mine gas drainage pipe network

Abstract

The invention relates to a method for improving acoustic wave leak detection accuracy of a coal-mine gas drainage pipe network. The method comprises the following steps that S1, a gas leakage model ofpressure gas acoustic waves in a down hole gas drainage pipe network system is established, and a noise model corresponding to gas leakage of the pipe network is established; S2, routing inspection is performed on down hole gas drainage pipelines of a coal mine, mixed sound is collected through an acoustic wave probe, and the mixed sound is separated by a multi-variate gaussian function fitting method to obtain a frequency spectrum of all sound types contained in the mixed sound; and S3, the separated sound frequency spectrum is compared with the preset gas leakage model and the noise model to obtain a processing result. According to the method for improving the acoustic wave leak detection accuracy of the coal-mine gas drainage pipe network, the frequency spectrum parameters are used forcharacterizing the different types of sound, and the frequency spectrum is used as a determination basis, so that the sound waves generated by the gas leakage are directly determined to determine theposition of a gas leakage point, and high accuracy is achieved.

Description

technical field [0001] The invention belongs to the technical field of leak detection for underground gas drainage pipe network systems in coal mines, and relates to a method for improving the accuracy of acoustic wave leak detection for gas drainage pipe networks in coal mines. Background technique [0002] Coal occupies an absolutely dominant position in my country's primary energy structure, and its proportion was as high as 90% in the 1950s. However, under the new situation, the development of my country's coal industry is facing severe challenges. The most serious restrictive factor for safe production. Gas drainage is the fundamental measure to prevent and control gas disasters in coal mines. Due to the advantages of simple construction and low cost, underground drilling has been widely used in coal mines in my country. The amount of gas drainage in coal mines has increased rapidly. Since 2000, gas drainage The volume increased from 870 million cubic meters to 13.3 bill...

AI Technical Summary

Problems solved by technology

However, the underground conditions of the coal mine are complex, and the environment such as belt conveyors, mine cars, and drilling rig construction will produce obvious sounds, which greatly interferes with the inspection and determination of gas leak holes in the gas pipe network, which greatly reduces the impact of ultrasonic waves on coal mine gas. Accuracy of leak detection in drainage pipe network

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