锅炉水冷壁管氢腐蚀爆管原因分析

Cause Analysis of Hydrogen Corrosion Induced Bursting of Waterwall Tubes in a Boiler

某热电厂5号锅炉水冷壁发生爆管.对取样水冷壁管进行了宏观观察、化学分析、金相分析、扫描电镜与电子能谱分析及X射线衍射分析等.结果表明,爆管原因是水冷壁管向火侧内壁局部区域发生氢腐蚀所致.提出了预防此类事故发生的措施.

Bursting failure occurred on waterwall tubes of No.5 boiler in a power plant. Macroscop- ic inspection, chemical analysis, metallurgraphy, scanning electron microscopy （SEM）, energy dis-persive spectroscopy （EDS） and X-ray diffraction （XRD） were adopted to examine the failed tube. The results indicated that the tube rupture was resulted from localized hydrogen corrosion of the part facing fire. Preventive measures of such failures are put forward.