旋风分离器中心筒失效分析及焊接工艺探究
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摘要
循环流化床锅炉的旋风分离器是电站重要部件,本文以某电站循环流化床锅炉的旋风分离器中心筒焊缝运行中开裂,并在修复焊缝过程中焊缝数次断裂现象为例,通过宏观检查、化学成分分析、金相分析、断口分析等技术手段进行失效分析。结果表明:母材内外壁边缘有较多缩孔及微裂纹,焊缝工艺控制不当,组织老化严重为失效主要原因。最后讨论了此类构件焊接时的焊接工艺,为现场操作提供参考价值。
The central cylinder of the cyclone separator is an important part in circulating fluidized bed boiler. Taking the weld cracking of the cyclone separator central cylinder in operation and several times of cracking during the repair in a power station as an example, this paper makes a failure analysis through technologies of macro inspection, chemical composition analysis, metallographic examination and fracture analysis. According to the results, a great many contraction cavities and tiny cracks on the edge of both inside and outside walls of the base metal, the improper welding process control and the seriously aging organization are the main reasons for the failure. Finally, the welding process of such components is discussed, which is of reference value for field operation.
The central cylinder of the cyclone separator is an important part in circulating fluidized bed boiler. Taking the weld cracking of the cyclone separator central cylinder in operation and several times of cracking during the repair in a power station as an example, this paper makes a failure analysis through technologies of macro inspection, chemical composition analysis, metallographic examination and fracture analysis. According to the results, a great many contraction cavities and tiny cracks on the edge of both inside and outside walls of the base metal, the improper welding process control and the seriously aging organization are the main reasons for the failure. Finally, the welding process of such components is discussed, which is of reference value for field operation.
引文
[1] 徐天猛.旋风分离器性能优化的研究[D].上海:华东理工大学,2011.
[2] 郭寿鹏,高洪吉,李晓桐.锅炉旋风分离器中心筒失效分析[J].山东冶金,2010(01):61- 62.
[3] 张文钺.焊接冶金学[M].北京:机械工业出版社,2011.
[4] 王心宽.TP304H奥氏体不锈钢WS焊接工艺[J].民营科技,2012(02):31.
[5] 赵强,肖维宝,王大强.304不锈钢法兰焊接裂纹分析及返修[J].焊接,2017(2).
[6] 戴伟.奥氏体不锈钢焊接接头在超高温服役中的显微结构转变研究[D].武汉:武汉理工大学,2002.
[7] 申艳丽,孟庆森,张丙静.焊接工艺对2205双相不锈钢焊接接头综合性能的影响[J].焊接,2007(06):52-57,69.
[2] 郭寿鹏,高洪吉,李晓桐.锅炉旋风分离器中心筒失效分析[J].山东冶金,2010(01):61- 62.
[3] 张文钺.焊接冶金学[M].北京:机械工业出版社,2011.
[4] 王心宽.TP304H奥氏体不锈钢WS焊接工艺[J].民营科技,2012(02):31.
[5] 赵强,肖维宝,王大强.304不锈钢法兰焊接裂纹分析及返修[J].焊接,2017(2).
[6] 戴伟.奥氏体不锈钢焊接接头在超高温服役中的显微结构转变研究[D].武汉:武汉理工大学,2002.
[7] 申艳丽,孟庆森,张丙静.焊接工艺对2205双相不锈钢焊接接头综合性能的影响[J].焊接,2007(06):52-57,69.