Acoustic signal based device and method for detecting gas pipeline leakages

Abstract

The invention discloses an acoustic signal based device and method for detecting gas pipeline leakages. The detection device comprises an acoustic sensor group, a signal conditioner, an analog-to-digital converter, a data transmission medium and a central control computer. The detection method comprises that acoustic sensors are installed on a pipeline to be tested to collect signals, collected acoustic signals are subjected to signal conditioning through the signal conditioner, then voltage signals are converted into digital signals through the analog-to-digital converter, converted digital signals are transmitted to the central control computer through the data transmission medium, and an acoustic signal display, filtering, feature extraction and leakage judgment program which is written through LabVIEW software is installed in the central control computer. The device and the method have the advantages of being low in cost, high in device sensitivity, high in adaptability and the like.

Description

Technical field: [0001] The invention relates to a pipeline leakage detection device and detection method, which belong to the technical field of safe use management, monitoring and diagnosis of gas transmission pipelines. The acoustic wave signal generated when the pipeline leaks is used for leakage detection and fault judgment to protect the integrity and integrity of the pipeline. Safety, so as to ensure the safe production and operation of gas pipelines. Background technique: [0002] Pipelines are generally laid underground. When a pipeline leaks, it is difficult to be found in time. When the pipeline transport gas is flammable or toxic, it is extremely dangerous. [0003] Nowadays, the widely used pipeline leakage detection methods mainly include mass / flow balance method, applied statistics method, transient model method, negative pressure wave method, intelligent climbing machine in pipe, and distributed optical fiber method. The sonic leakage detection method is a n...

AI Technical Summary

Problems solved by technology

[0011] The above leak detection devices and methods involving the sonic method are all described from four aspects: data collection, transmission, filtering, and leak judgment and location. The basic principles are similar, but the existing patents are too general and simple, and lack the definition of key technologies. ,Specifically in:

[0012] (1) Signal acquisition is the basis for the operation of the entire system. Sensor indicators affect the quality of acoustic signal acquisition. The above patents simply define the types of sensors and do not specify the performance indicators of the sensors;

[0013] (2) Leakage sound wave signals are attenuated during propagation. The layout of sensors on long-distance natural gas pipelines must not only capture leakage sound wave signals with sufficient signal-to-noise ratio, but also minimize the number of sensors. The existing patents do not involve The layout method of the sensor, the sensor layout spacing is vague;

[0014] (3) Different filtering methods have different applicability to the leaked sound wave signal. The above patents do not propose the length of the filtered signal and the specific filtering method, and the filtering effect is difficult to evaluate;

[0015] (4) Leakage acoustic signals often have multiple leakage feature quantities in the time-frequency domain, and different feature quantities highlight the leakage process differently. The above patents do not specify the feature quantities for leak judgment, which will affect the accuracy of leak judgment

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