某电厂工业冷却水热交换器传热管的涡流检测

Eddy current testing of heat transfer tubes in industrial cooling water heat exchangers of a power plant

在对某电厂工业冷却水热交换器传热管进行涡流检测时发现,多根传热管存在外壁缺陷,且均位于限位杆处,经拔管验证均为限位杆磨损缺陷。由于该设备结构特殊,限位杆与传热管之间为点接触,结合其产生的涡流信号特征,对该类缺陷的分析及定量方法进行了对比分析,为同类设备的涡流检测提供了实践经验。

When conducting eddy current testing on the heat transfer tubes of an industrial cooling water heat exchanger in a power plant,it was found that multiple heat transfer tubes had external wall defects,all located at the limit rods.After pipe pulling,it was verified that they were all wear defects of the limit rods.Due to the special structure of the equipment,there was a point contact between the limit rods and the heat transfer tubes.Based on the characteristics of the eddy current signals generated,the authors conducted a comparative study on the analysis and quantitative methods of these defects and provided practical experience for eddy current testing of similar equipment.