Method and device for detecting and assessing deposit in metal pipe

A technology for deposits and metal pipes, applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc., can solve problems such as undetectable by endoscopes, destructive testing, etc., and solve equipment failures or safety accidents , accurate detection and broad prospects

Inactive Publication Date: 2009-08-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 t

Method used

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  • Method and device for detecting and assessing deposit in metal pipe
  • Method and device for detecting and assessing deposit in metal pipe
  • Method and device for detecting and assessing deposit in metal pipe

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0022] Example 1: as figure 1 As shown, the detection device provided by the present invention includes an excitation device 1, a microphone 2, and a computer 3 with a data acquisition card. The computer 3 is equipped with acquisition software for signal recording, and is used for wavelet packet analysis, time domain analysis and Signal processing software and neural network expert diagnosis system that can calculate the characteristic parameters of each frequency band energy value, time domain signal duration and / or spectrum maximum resonance frequency amplitude of wavelet packet analysis. The microphone 2 is fixed on the metal elbow and is located at the normal incident position of the sound wave. The microphone 2 and the data acquisition card are respectively connected with the computer host. In order to excite the sound wave reflecting the impulse response characteristics of the structural body in the metal elbow, the excitation device in this embodiment 1 can use a steel ...

Example Embodiment

[0023] Example 2: The specific steps for detecting and evaluating the deposits in the metal elbow with the detection device of Example 1 are as follows:

[0024] 1) Hit the lower part A of the metal elbow with a steel hammer to excite a sound wave that can reflect the impulse response characteristics of the structure body;

[0025] 2) Use the microphone and the data acquisition card to transmit and collect the excited sound wave signal;

[0026] 3) Record the sound with the acquisition software and store it in the computer;

[0027] 4) Perform wavelet packet analysis, time domain analysis and / or spectrum analysis on the signal, and calculate the characteristic parameters of each frequency band energy value, time domain signal duration and / or the maximum resonance frequency amplitude of the spectrogram of the wavelet packet analysis;

[0028] 5) Input the characteristic parameters into the neural network expert diagnosis system for identification, qualitatively and quantitativ...

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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...

Claims

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Application Information

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IPC IPC(8): F17D5/00
Inventor 李晓红郭慧英
Owner WUHAN UNIV
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