A pipeline leak detection device based on acoustic emission and a single sensor positioning method
A detection device and a single-sensor technology, which is applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., can solve the problems of high cost of positioning and detection of multiple sensors, and decreased positioning accuracy
Active Publication Date: 2018-10-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0007] The purpose of the present invention is to overcome the disadvantages of decreased positioning accuracy caused by performance differences among multiple sensors and high cost of positioning and detection of multiple sensors, and provide a pipeline leakage detection device based on acoustic emission and a single-sensor positioning method
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[0034] The pipe section is located on the seashore of Gudao Oilfield, Dongying City. The pipe length is about 60m, the pipe diameter is 89mm, the wall thickness is 6.45mm, and the material density is 7850kg / m 3 , the modulus of elasticity is 210GPa, and Poisson's ratio is 0.3. Based on the known parameters such as pipe diameter, wall thickness, material density, elastic modulus and Poisson's ratio coefficient of this pipe section, combined with the modal acoustic emission theory, the velocity dispersion curve of each mode guided wave in the pipe is obtained by using MATLAB programming. Such as image 3 Shown is the group velocity dispersion curve.
[0035] The gas pressure in the pipeline is 2MPa, and the leakage hole diameter is 4mm. The actual distance between the sensor and the leakage source is shown in Table 1.
[0036] Table 1 Pipeline sensor and leak source location
[0037]
[0038] Taking the first set of data, that is, the distance between the sensor and the l...
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The invention belongs to the field of pipeline inspection, and particularly relates to a pipeline leakage detection device based on acoustic emission and a single-sensor positioning method. The positioning and detection device comprises a piezoelectric ceramic sensor, a pre-amplifier, a filter, a main amplifier, an A / D (analog-to-digital) converter and a host, the piezoelectric ceramic sensor is connected with the pre-amplifier, the piezoelectric ceramic sensor is connected with a specimen through a coupling agent, the specimen is a gas-filled pipe section with flaws, the pre-amplifier is connected with the filter, the filter is connected with the main amplifier, the main amplifier is connected with the A / D converter, and the A / D converter is connected with the host. The invention which is based on an acoustic emission inspection technique acquires tiny leakage signals by means of the high-sensitivity piezoelectric ceramic sensor, utilizes the modal acoustic emission theory and the EMD (Empirical Mode Decomposition) method to extract two types of modal guided waves of the leakage signals and analyzes and processes the acoustic emission leakage signals in combination with Gabor wavelets to achieve the objective of effectively finding and accurately positioning pipeline leakage points.
Description
technical field [0001] The invention relates to a pipeline leak detection and positioning device and a detection and positioning method, in particular to a pipeline leakage detection and positioning using a single sensor, and belongs to the technical field of fault diagnosis and flow safety guarantee. Background technique [0002] Pipeline transportation occupies an important position in the global transportation of energy materials (including crude oil, refined oil, natural gas, oilfield associated gas, etc.), and has become the fifth largest transportation industry after railway, highway, water transportation and air transportation. However, pipeline leakage has always been a difficult problem in pipeline transportation since it was applied in industry. Especially as the pipeline enters its old age, its hidden dangers of damage and leakage will multiply. If the leakage can be detected in time and the location of the leakage can be located, the harm caused by the leakage ca...
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IPC IPC(8): F17D5/06
CPCF17D5/06
Inventor 徐长航龚漂任乐峰谢静韩国星李振兴李桂杰张丽珍
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)