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A Quantitative Analysis Method for Low-Frequency Array Eddy Current Positioning

A quantitative analysis and array technology, applied in the analysis of materials, material analysis through electromagnetic means, and measurement devices, can solve problems such as boiler heating surface defects, improve detection accuracy and on-site work efficiency, avoid defect missed detection, and easily The effect of production

Active Publication Date: 2021-05-14
CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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Problems solved by technology

[0008] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a low-frequency array eddy current positioning and quantitative analysis method, which can effectively solve the problem of boiler heating surface defect detection

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  • A Quantitative Analysis Method for Low-Frequency Array Eddy Current Positioning
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  • A Quantitative Analysis Method for Low-Frequency Array Eddy Current Positioning

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Embodiment Construction

[0037] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Depend on Figure 1-9 Given, a low-frequency array eddy current positioning quantitative analysis method of the present invention comprises the following steps:

[0039] A. To test and judge the standard of waste and to calibrate

[0040] DL / T 939-2016 "Technical Guidelines for Supervision of Boiler Heating Surface Tubes in Thermal Power Plants" stipulates that the wall thickness reduction of water-cooled walls, economizers, superheaters and reheaters in the low-temperature section should not exceed 30% of the design wall thickness. The wall thickness reduction of the superheater in the high temperature section is not easy to exceed 20% of the designed wall thickness. The amount of thinning is used as the standard for detection and rejection;

[0041]First process the test tubes for comparison of detection sens...

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Abstract

The invention relates to a low-frequency array eddy current positioning and quantitative analysis method. The technical solution includes the following steps: A. calibrate the detection and judgment standard; B. locate the defect; C. quantify the defect by using the three-dimensional C scanning image processing function ; The present invention eliminates the interference of spatially scattered magnetic flux leakage through the magnetic shielding technology of the magnetic pot and the shielding coil, and improves the defect resolution. During the detection process, the 8 detection coils can be independently imaged, and the detection sensitivity is always consistent, avoiding the Defect missed detection, one operation can detect the inner wall defect of the heating surface steel pipe covered by the probe, without reciprocating operation, by adopting the low-frequency array eddy current positioning quantitative analysis method, taking advantage of the advantages of low-frequency array eddy current probe and three-dimensional C-scan stereo image imaging display, it can effectively solve the problem The positioning and quantification of corrosion defects on the inner wall of the heating surface tube of the utility boiler improves the detection accuracy and field work efficiency, and ensures the reliable and stable operation of the heating surface tube of the utility boiler.

Description

technical field [0001] The invention relates to the technical field of eddy current detection of boiler heating surface tubes in electric power systems, in particular to a low-frequency array eddy current positioning and quantitative analysis method. Background technique [0002] The heating surface of a power plant boiler is an important heat transfer element of the boiler. It will corrode due to long-term direct contact with flue gas, water, steam and other working media, resulting in thinning of the tube wall, deterioration of material properties, and eventually expansion deformation or tube burst accidents. Therefore, using a non-destructive testing method to detect defects on the inner wall of boiler heating surface tubes, timely grasping the degree of damage caused by defects, and rationally replacing tube rows can effectively avoid safety accidents caused by such defects. [0003] At present, the common detection methods for heating surface defects include ultrasonic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/9013
CPCG01N27/904
Inventor 贾少威王警卫刘文生朱国斌江野王东王昊裴喜伟曹胜仁宋利刘永成乔梁句光宇邓辉杨希锐张琬如郑艳
Owner CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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