Ultrasonic guided wave online detection device of high-temperature pipeline based on T-shaped waveguide structure

Abstract

The invention provides an ultrasonic guided wave online detection device of a high-temperature pipeline based on a T-shaped waveguide structure and belongs to the technical field of ultrasonic detection. The device comprises an ultrasonic guided wave probe, a T-shaped waveguide, a waveguide connecting part and a to-be-detected pipeline. The ultrasonic guided wave probe is used for stimulating zero-mode horizontal shearing guided wave (SH0 mode flat plate guided wave), and comprises a transmitting probe and a receiving probe. The T-shaped waveguide takes two same T-shaped steel plates as a transmitting waveguide and a receiving waveguide; one end of the transmitting waveguide and one end of the receiving waveguide are wound on the to-be-detected pipeline respectively; and the other ends of the transmitting waveguide and the receiving waveguide are mounted on the ultrasonic guided wave probe. The device provided by the invention can be used for online detection of the high-temperature pipeline, and the long-distance waveguide structure can guarantee that the probe is far away from a high-temperature environment, so that the difficulty of online detection of the high-temperature pipeline is overcome; a wave mode conversion property of ultrasonic guided wave is utilized and the SH0 mode flat plate guided wave is processed by the T-shaped waveguide so as to be converted into pipeline transverse modal guided wave which is transmitted in the pipeline, so that comprehensive detection of the whole pipeline is realized.

Description

Technical field [0001] The invention belongs to the technical field of ultrasonic detection, and particularly relates to a high-temperature pipeline ultrasonic guided wave online detection device based on a T-shaped waveguide structure. Background technique [0002] As one of the five major transportation vehicles, pipelines have special advantages in transporting liquids, gases, and slurries. However, the pipeline is affected by erosion and corrosion during long-term use, resulting in thinning of the pipe wall and accompanied by defects. Leakage accidents often occur, which not only cause huge economic losses, but also cause serious safety accidents. Therefore, non-destructive testing of pipelines has significant economic and social benefits. [0003] There are many kinds of non-destructive testing techniques for pipelines. At this stage, ultrasonic method, magnetic flux leakage method and eddy current method are more widely used. However, the conventional non-destructive testin...

AI Technical Summary

Problems solved by technology

However, there is a serious shortcoming in conventional non-destructive testing technology: the detection process is point-by-point scanning, and the detection efficiency is low.

However, the current ultrasonic guided wave testing equipment for pipelines cannot perform online real-time detection of pipelines, because most pipelines work in high-temperature and high-pressure transportation environments, and it is difficult for ultrasonic guided wave testing devices to operate normally in high-temperature environments

Therefore, the current non-destructive testing of pipelines is carried out when the pipeline is out of service, which will seriously affect the economic benefits

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