摘要
介绍了火力发电厂水冷壁管氢损伤的机理,以及水冷壁管氢损伤超声检测系统各组成部分的选择原则。背散射法使用的探头频率和灵敏度较高,可判断氢损伤的严重程度及测量出氢损伤的厚度;超声波频率一般选择10～15MHz,选择d6～10mm的探头晶片;选择频率可达到20MHz的探伤仪。通过现场实例证实,水冷壁氢损伤的超声检测方法准确可靠,检验灵敏度及分辨率高,操作方便。
The mechanism of hydrogen damage on water- wall tubes in thermal power plants, as well as the selection of components used in ultrasonic detecting system for hydrogen damage on water - wall tubes have been presented. The frequency and sensitivity of probe used in back scattering method are comparatively higher, the severity of hydrogen damage can be determined, and the thickness of hydrogen damage can be measured. The ultrasonic frequency is commonly selected as 10415 MHz,and the probe wafer being selected as d6-10 mm,the frequency range of detector being selected as 20 MHz. Through practical examples in the field, it has been verified that the ultrasonic detecting method used for hydrogen damage on the water- wall is accurate and reliable,having high detecting sensitivity and resolving capability,and being convenient to operate.
出处
《热力发电》
CAS
北大核心
2009年第4期84-86,91,共4页
Thermal Power Generation
关键词
发电厂
锅炉
水冷壁管
氢损伤
超声检测
thermal power plant
boiler
water - wall tube
hydrogen damage
ultrasonic detection
