Method and device for detecting and assessing deposit in metal pipe

Abstract

The invention provides a method for detecting and evaluating deposits in a metal tube and a device thereof. The method comprises the steps: 1) knocking the exciting part of the metal tube through an exciting device to excite acoustic waves capable of reflecting the pulse response characteristics of the structural body; 2) sending and acquiring the excited acoustic wave signals through a microphone and a data acquisition card; 3) recording sounds through an acquisition software and storing the sounds in a computer; 4) carrying out wavelet packet analysis, time domain analysis and / or spectrum analysis on the signals, computing characteristic parameters such as energy value of each spectrum, duration of time domain signal and / or maximum resonance frequency amplitude of spectrogram of the wavelet packet analysis; and 5) inputting the characteristic parameters into a neural network expert diagnosis system for identification, determining whether the deposits exist in the tube or not and quantifying the deposits, and evaluating the plugging degree in the tube according to the quantification result. The device comprises an exciting device, a microphone, and a computer having a data acquisition card, wherein the microphone is fixed at the metal tube, and the microphone and the data acquisition card are connected with the computer host respectively.

Description

technical field [0001] The invention relates to a method for detecting and evaluating deposits in a metal pipe and a device used therein, and belongs to the technical field of non-destructive detection inside a pipe. Background technique [0002] With the development of industrial technology, various metal pipes and equipment are increasing day by day. To ensure its safe operation, frequent inspections are required. Due to the limitations of the pipeline and equipment operating environment, it is difficult to conduct internal inspection directly, which leads to various safety accidents. Peeling and clogging lead to a reduction in the flow area of ​​the tubes, making the lower elbow of the furnace tubes in a state of overheating for a long time, resulting in a boiler tube burst accident. Therefore, it is urgent to use appropriate methods to accurately detect and evaluate the accumulation inside the elbow. [0003] At present, there are roughly two methods for detecting dep...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the pipeline structure and the size of the pipe diameter, the endoscope cannot detect every part; for those without an endoscope to enter the channel, pipe cutting inspection is required, which belongs to the category of destructive testing

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