| WNS型燃气蒸汽锅炉管板（管口）泄漏原因分析 |
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| 引用本文： | 薛峰,卢忠铭,王恋.WNS型燃气蒸汽锅炉管板（管口）泄漏原因分析[J].中国安全生产科学技术,2015,11(9):191-196. |
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| 作者姓名： | 薛峰 卢忠铭 王恋 |
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| 作者单位： | 广州特种承压设备检测研究院，广东 广州 510663） |
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| 摘 要： | 某医院有两台WNS10-1.25-Y/Q燃气锅炉,连续发生多次回燃室前管板烟管管口泄漏故障,分析了缺陷产生的原因，并提出了解决方法。在长期交变热应力作用下，烟管管口角焊缝熔合线区域产生内部微裂纹，微裂纹在交变热应力（断口分析的形貌为韧窝）的作用下逐步扩展，形成内部宏观（金相检验时发现了多条内部裂纹，且裂纹走向是平行于烟管轴向的方向），裂纹沿着轴向向烟管前后端扩展，最终扩展到管端，并穿透管壁，导致锅炉汽水从裂口泄漏。
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| 关 键 词： | 锅炉 烟管 泄漏 |
Analysis on leakage reasons of tube sheet (tube mouth) on WNS gas steam boiler |
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| XUE Feng,LU Zhong-ming,WANG Lian.Analysis on leakage reasons of tube sheet (tube mouth) on WNS gas steam boiler[J].Journal of Safety Science and Technology,2015,11(9):191-196. |
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| Authors: | XUE Feng LU Zhong-ming WANG Lian |
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| Affiliation: | (Guangzhou Special Pressure Equipment Inspection and Research Institute, Guangzhou Guangdong 510663, China) |
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| Abstract: | There exists 2 WNS10-1.25-Y/Q gas boilers in a certain hospital, and the leakage faults have occurred in the tube mouth of smoke tube on front tube sheet of reversal chamber for several times continuously. The reasons of defects were analyzed, and the solving methods were put forward. Under the long term action of tremendous thermal stress, the internal micro cracks came into being in the fillet weld junction region on tube mouth of smoke tube. The micro cracks expanded gradually under the action of tremendous thermal stress (the morphology of fracture analysis is dimple), and formed the internal macro (multiple internal cracks were found in metallographic examination, and the crack path was parallel to the axial direction of smoke tube). The cracks expanded to the front end and back end of smoke tube, and finally reached the tube end, then penetrated the wall of tube, resulting in leakage of steam-water from the gap. |
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| Keywords: | boiler smoke tube leakage |
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