某超临界锅炉水冷壁多处泄漏原因分析  

Analysis on Multiple Leakages Causes in Water Wallof a Supercritical Boiler

作　　者：董鹏 盛金贵 田成川 Dong Peng;Sheng Jingui;Tian Chengchuan(Huadian Electric Power Research Institute Co.,Ltd.,Huhhot 010020,China)

机构地区：[1]华电电力科学研究院有限公司,呼和浩特010020

出　　处：《发电设备》2024年第6期389-392,共4页Power Equipment

摘　　要：某超临界锅炉水冷壁螺旋管区域发生多处泄漏,对泄漏管取样后进行了宏观检查、化学成分、金相组织和拉伸性能等分析.结果表明:原始泄漏点处于水冷壁管鳍片焊缝熔合区,鳍片焊缝存在大量焊接缺陷导致产生该泄漏点;泄漏的汽水流将相邻管吹损,相邻管出现多处次生漏点,造成管内介质流量降低,导致在次生漏点的下游区域发生短时过热爆管.建议应严格控制和检查鳍片焊缝的焊接质量.The spiral tube of the water wall of a supercritical boiler was leaked in many places.After sampling the leakage tube,the macroscopic examination,chemical composition,metallographic structure and tensile properties were analysed.Results show that,the original leakage point is located in the fusion zone of the water wall tube fin weld,which is caused by a large number of welding defects in the fin weld.The leakage of steam water blows adjacent pipe.The adjacent pipe appears multiple secondary leakage points,and the medium flow rate in adjacent pipe is reduced,resulting in short-term overheating in the downstream area of the secondary leakage points.It is recommended that the welding quality of fin welds should be strictly controlled and checked.

关 键 词：超临界锅炉 水冷壁 鳍片焊缝 焊接缺陷 短时过热 

分 类 号：TM621[电气工程—电力系统及自动化] TG441.7[金属学及工艺—焊接]