站锅炉水冷壁管腐蚀检测.pdf

电站锅炉水冷壁管腐蚀检测

刘凯厦门涡流检测技术研究所福建厦门 361004
王维东徐州电力试验中心江苏徐州 221009
朱伟明安徽淮南平发电有限公司安徽淮南 232089
李林华电攀枝花发电公司四川攀枝花 617066


摘要:锅炉是电站重要设备,其水冷壁管内腐蚀和裂纹造成爆裂致使停炉等严重事故,
一直是困扰业界之难题。本文介绍新发展的低频电磁技术能够从管道外壁快速探测管内壁
缺陷,并已在多个电厂成功运用。
关键词:水冷壁管;缺陷;低频电磁

Inspection of Waterwall Tube Defects for Power Plants

LIU Kai Xiamen Eddy Current NDT Testing Institute 361004, China
WANG Weidong Xuzhou Electric Power Research Institute 221009,China
ZHU Weiming Pingwei Eleectric Power Co. 232089,China
LI Lin China Hua Dian Panzhihua Power Co. 617066, China

Abstract: This paper introduces a system using a scanner moved along the tube wall to
scan from OD for defects inside the tube, primarily on the fireside. Typical defects found on
these waterwall tubes are hydrogen damage, caustic gouging, etc. This system is based on low
frequency ic technology. The tubes are not required to be cleaned to the level
necessary for UT thinkness testing. This new system is fast, accurate, cost effective and field
proven for power plants.
Keywords: Boiler waterwall; Defect; Wallthickness; Low frequency ic

锅炉是热电厂最重要的生产设备,其炉内水冷壁管在长期服役中受到烟气、煤灰和火
焰等侵蚀,极易出现磨损、腐蚀,造成管壁局部减薄,在管内高压、高温蒸汽的作用下,
最终产生管体爆裂泄漏等严重事故。锅炉出现泄漏与一般管道出现泄漏不同,无法在继续
生产运行中进行维修,往往要停机抢修,其经济损失巨大,因而各电厂对有效减少和避免
锅炉管爆漏都非常重视,加强水冷壁管的在役运行材质的监测和检查具有十分重要的现实
意义。

1. 水冷壁管内壁腐蚀机理
造成水冷壁管管壁减薄的原因主要有外壁烟灰吹蚀和内壁垢下腐蚀。前者出现在管外
壁与炉内