600 MW调峰机组水冷壁管失效原因分析  

Failure Analysis of Water-cooled Wall Pipes in the Deep Peak Shaving of 600 MW Units

作　　者：张磊[1] 张烟生 李广 陈耀华[1] 付检平[1] Zhang Lei;Zhang yansheng;Li Guang;Chen yaohua;Fu Jianping(China Special Equipment Inspection&Research Institute,Beijing 100029)

机构地区：[1]中国特种设备检测研究院,北京100029

出　　处：《中国特种设备安全》2025年第1期88-92,共5页China Special Equipment Safety

摘　　要：本文以某电厂600 MW超临界机组锅炉失效水冷壁管为研究对象,利用宏观形貌分析、化学成分分析、常温拉伸性能试验、金相分析等方法对失效原因进行了分析。分析结果显示,水冷壁管失效的主要原因为运行中锅炉温差波动较大,由于结构约束造成热膨胀受阻,导致管壁应力集中部位在交变应力的作用下形成疲劳裂纹,进而发生开裂失效。最后对防止此类失效提出了相关建议。The failure cause of boiler water-cooled wall pipes of a 600 MW supercritical unit in a certain power plant was analyzed using methods such as macroscopic morphology analysis,chemical composition analysis,room temperature tensile property test,and metallographic structure analysis.The analysis results show that the main reason for the failure of water-cooled wall pipes is the large temperature difference fluctuation of the boiler during operation,and the structural constraints cause thermal expansion to be hindered,resulting in fatigue cracks at the stress concentration areas of the pipe wall under the action of alternating stress,leading to cracking failure.This article provides relevant suggestions for preventing such failures.

关 键 词：超临界 水冷壁 温度波动 疲劳裂纹 

分 类 号：X933.2[环境科学与工程—安全科学]