Quantitative analyzing method for positioning of low-frequency array eddy current
A quantitative analysis and array technology, applied in the direction of analyzing materials, material analysis by electromagnetic means, measuring devices, etc., can solve problems such as boiler heating surface defects, improve detection performance and detection data analysis capabilities, avoid defects missed detection, Easy to produce effects
Active Publication Date: 2018-06-12
CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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[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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[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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The invention relates to a quantitative analyzing method for positioning of low-frequency array eddy current. According to the technical scheme, the quantitative analyzing method for positioning of low-frequency array eddy current comprises the following steps: A, detecting and calibrating a waste determining standard; B, carrying out defect positioning; and C, quantifying defects by using a three-dimensional C scanning image processing function. Interference of space scattered leakage magnetic flux is eliminated by a magnetic tank and a magnetic shielding technology of a shielding coil, defect resolving power is improved, in a detecting process, eight detecting coils can be used for imaging independently, detecting sensitivity can be always consistent, leak detection on defects is avoided, probe covered heated surface steel tube inner wall detects can be detected by one-time operation, repeated operations are not required, by the quantitative analyzing method for positioning of the low-frequency array eddy current, by a low-frequency array eddy current probe and imaging and displaying advantages of three-dimensional C scanned stereo images, the problems of positioning and quantifying of corrosion defects of the inner wall of a heated surface tube of a boiler of a power station is solved, the detection precision and field working efficiency are improved, and reliable and stablerunning of the heated surface tube of the boiler of the power station is ensured.
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 ...
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IPC IPC(8): G01N27/90
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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