Pulsed Eddy Current Testing for Thickness Measurement of Oxide Scales Accumulated in Austenitic Boiler Tubes
摘 要
针对奥氏体锅炉管内氧化皮堆积带来的机组安全隐患问题,应用脉冲涡流技术对氧化皮堆积厚度进行定量检测。设计并制作了开合式传感器,该传感器具有结构简单、使用方便、通用性较强的优点。构建了脉冲涡流检测试验系统,并将其用于TP347H管样内氧化皮堆积厚度的检测,试验研究了传感器信号特征、提离影响及阵列接收效果。结果表明:检测信号峰值与氧化皮堆积厚度存在线性关系,可用于堆积厚度的准确定量;信号峰值随传感器提离增加而线性减小;以阵列接收信号差分峰值为特征量,可消除服役锅炉管电磁属性转变带来的影响。研究成果可为奥氏体锅炉管氧化皮堆积厚度检测提供应用参考价值。
Abstract
Austenitic boiler tubes used in power units often suffer from security problems due to accumulation of oxide scales exfoliated from the inside tube wall. In this paper, the pulsed eddy current (PEC) testing technique was presented to quantitatively measure the accumulated oxide-scale thickness. First, an open-close sensor was designed and developed. It was simple in structure and easy to use with good feasibility. Then, a PEC experimental system was established and was applied to measure the accumulated oxide-scale thickness in TP347H tube sample. Finally, experiments were conducted to study the sensor signal characteristics, influence of sensor lift-off and the effect of receiver array. Results show that: the peak value of test signals varies linearly with the accumulated oxide-scale thickness and thus it can be used to accurately quantify the accumulation thickness; the peak value decreases linearly as the sensor lift-off increases; the influence of magnetic transformation of tube wall on measurements can be eliminated by using the peak value of differential signals between array receivers. The results may provide some guidance for the thickness measurement of oxide scales accumulated in austenitic boiler tubes.
中图分类号 TG115.28 DOI 10.11973/wsjc201710003
所属栏目 2018远东无损检测新技术论坛论文精选
基金项目 国家自然科学基金资助项目(51505406);湖南省自然科学基金资助项目(2015JJ3116);湖南省教育厅科研资助项目(15C1323)。
收稿日期 2017/6/25
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备注徐志远(1984-),男,博士,副教授,主要研究方向为电磁无损检测技术
引用该论文: XU Zhiyuan,ZHU Jingzhe,YUAN Xiangmin,LIN Wen. Pulsed Eddy Current Testing for Thickness Measurement of Oxide Scales Accumulated in Austenitic Boiler Tubes[J]. Nondestructive Testing, 2017, 39(10): 12~16
徐志远,朱竞哲,袁湘民,林稳. 奥氏体锅炉管氧化皮堆积厚度脉冲涡流检测[J]. 无损检测, 2017, 39(10): 12~16
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【6】唐彬. RT在末级过热器氧化皮堆积检测中的应用[J]. 无损检测, 2014, 36(2): 47-49+52.
【7】OHTOMO A. Magnetic measurement of internal scale in austenitic stainless steel tubes[R]. Tokyo: Ishikawajima-Harima Heavy Industries Company Ltd., 2000.
【8】何晓东, 刘玉民, 刘雪峰, 等. 电磁法在检测奥氏体不锈钢氧化物堆积中存在的问题探讨[C]//第九届电站金属材料学术年会论文集.成都: 中国电机工程学会火力发电分会,2011.
【9】龙会国. 锅炉用奥氏体不锈钢弯管内部氧化皮检测的新方法[J]. 动力工程学报, 2010, 30(7): 554-558.
【10】史志刚, 董红年, 李益民, 等. S30432锅炉管高温服役后磁性转变试验研究[J]. 动力工程学报, 2014, 34(8): 660-667.
【11】彭啸, 李晓红, 刘云, 等. 高温受热面弯管氧化皮堆积的声振法检测研究[J]. 中国电机工程学报, 2011, 31(8): 104-107.
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【13】刘金秋. 奥氏体锅炉管内壁氧化皮脱落堆积测量技术研究[D]. 济南: 山东大学, 2011.
【14】伍权, 徐志远, 肖奇. 基于LabVIEW的脉冲涡流检测实验系统[J]. 测控技术, 2017, 36(12). (预出版)
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