【摘要】 本文针对炼厂内循环流化床锅炉首次出现的水冷壁泄漏,通过对水冷壁管束进行超声波扫描、远场涡流和壁厚检测,找到水冷壁管的缺陷部位。同时对受损管段割管进行化学成分分析、力学性能分析、管道解剖分析、腐蚀产物分析、金相分析、能谱分析以及水质调查,找出造成水冷壁泄漏的主要原因是锅炉水质合格率偏低以及水冷壁管中的汽水蒸发浓缩造成炉水碱度局部过高而引发碱腐蚀,最终导致水冷壁管减薄,强度不足发生泄漏。后续采取水冷壁受损部位局部更换、水冷壁化学清洗措施进行处理,同时加强锅炉水质管理进行预防,锅炉再次开工后运行情况良好。更多还原

【Abstract】 This article describes a leakage of the circulating fl uidized bed boiler water wall that appeared for the first time in the refinery.Through ultrasound scans, water cooling wall tube bundle remote field eddy current and wall thickness testing, to find all the defects of water wall tubes. At the same time, the damaged pipe is cut and analyzed by means of chemical composition analysis, mechanical performance analysis, pipeline anatomical analysis, corrosion products analysis, metallographic analysis, energy spectrum analysis and investigation of water quality. According to the results of the analysis and comparison of various typical characteristics of heating surface of boiler corrosion, it is found that the main causes of water wall leakage of boiler is low water quality qualified rate and the water cooled wall soda evaporation caused in the water cooled wall furnace alkalinity of local high and the occurrence of alkali corrosion resistance, eventually leading to water wall tube thinning intensity decreased leakage. Subsequent to take water wall damaged parts of the local replacement, water wall chemical cleaning measures to remedy, and strengthen the boiler water quality management for the prevention, the overall operation of the boiler starts again get a improvement.更多还原