某350 MW煤电机组锅炉水冷壁失效原因分析  

Failure Analysis of Boiler Water Wall of a 350 MW Coal-Fired Power Unit

作　　者：王宇 程翔 WANG Yu;CHENG Xiang(Guoneng Suzhou Thermal Power Co.,Ltd.,Suzhou 230041,China;Anhui Xinli Electric Power Technology Consulting Co.,Ltd.,Hefei 230601,China)

机构地区：[1]国能宿州热电有限公司,安徽宿州230041 [2]安徽新力电业科技咨询有限责任公司,安徽合肥230601

出　　处：《安徽电气工程职业技术学院学报》2024年第2期43-49,共7页Journal of Anhui Electrical Engineering Professional Technique College

摘　　要：文章使用宏观检查、微观组织分析、硬度检验等手段分析了某煤电机组锅炉水冷壁泄漏的原因。结果显示该水冷壁失效的原因是其堆焊工艺不规范,使得该处均为过热组织,应力最为集中,受锅炉启停炉和负荷大幅升降的影响,微裂纹快速萌生和扩展,最终发生爆管。最后针对本次事故给出了相应的工作对策和建议。In this paper,the reasons for the leakage of boiler water wall of a coal-fired power unit are analyzed by means of macroscopic examination,microstructure analysis and hardness test.The results show that the failure is caused by the non-standard welding process,resulting in the overheated structure and the most concentrated stress in the area.Affected by the boiler start-up and shutdown and the sharp increase and decrease of load,the microcracks are rapidly initiated and expanded and ultimately leads to the tube burst.Finally,corresponding countermeasures and suggestions are provided.

关 键 词：水冷壁 堆焊工艺 过热组织 失效 

分 类 号：TM621.2[电气工程—电力系统及自动化]