Auscultation ball type gas pipeline leakage detection device and method

Abstract

The invention provides an auscultation ball type gas pipeline leakage detection device and method. The auscultation ball type gas pipeline leakage detection device comprises auscultation heads, acoustic conducting pipes, acoustic emission sensors and an auscultation ball. Each acoustic conducting pipe is installed on the corresponding auscultation head, and the other end of each acoustic conducting pipe is connected to the corresponding acoustic emission sensor which is located inside the auscultation ball. When the auscultation ball moves along the axis of a detected gas pipeline under the action of the gas flow, the auscultation heads are driven to move along the inner wall of the detected gas pipeline. When gas leakage of the detected pipeline happens, multi-phase turbulent jet flow isformed by fluid in the pipeline on the leaking portion due to the pipe interior and exterior pressure difference of the leaking point, the jet flow, the pipeline and surrounding media conduct interaction with one another to outwards radiate energy, high-frequency stress waves are generated on the pipe wall, picked by the auscultation heads, then amplified by the acoustic conducting pipes and received by the acoustic emission sensors located in the auscultation ball, the change of output signals of the sensors is caused, and finally the output signals of the sensors are integrated to comprehensively evaluate the leakage situation of the gas pipeline.

Description

technical field [0001] The invention relates to the technical field of pipeline leakage detection, in particular to an auscultation ball type gas pipeline leakage detection device and detection method, which are used for qualitative measurement of gas leakage in pipelines. Background technique [0002] After years of research and development, various sensing technologies have been applied to gas pipeline leakage detection, such as metal magnetic flux leakage method, ultrasonic method, combustible gas sensing method, pressure gradient method, negative pressure wave method, flow balance method, sensor Sensing cable method, optical fiber sensing method, etc. Summarizing these methods, there are various deficiencies. For example, the sensing cable method needs to be laid together with the pipeline and its test is one-time. The sensor cable should be replaced; the combustible gas sensing method cannot cover all the pipelines to be tested; the disadvantage of the negative pressur...

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Problems solved by technology

Summarizing these methods, there are various deficiencies. For example, the sensing cable method needs to be laid together with the pipeline and its test is one-time. The sensor cable should be replaced; the combustible gas sensing method cannot cover all the pipelines to be tested; the disadvantage of the negative pressure wave method is that it has very high requirements for the real-time performance of the diagnosis, that is, the diagnosis system must be able to capture the negative pressure generated when the leak just occurs. Pressure wave signal, otherwise the pressure in the pipeline will reach equilibrium. Although the leakage continues to occur, the negative pressure wave method can no longer detect, resulting in failure of diagnosis; the acoustic emission method system develops a distributed distribution of point sensors in a wide range. Network, to determine the possible leakage location and type of oil and gas pipelines, the disadvantage is that a large number of sensors need to be arranged along the pipeline, the construction is difficult for existing buried pipelines, and the application adaptability is poor.

The existence of shortcomings in the detection method will reduce the adaptability and cost performance of the measurement system, and the reliability will be limited to a certain extent

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