某电厂锅炉后墙水冷壁螺纹管泄漏原因分析  

Analysis on the leakage of threaded tubes on the water wall of the boiler rear wall in a power plant

作　　者：张丛生[1] 史丹 王宏涛 ZHANG Congsheng;SHI Dan;WANG Hongtao(State Key Laboratory for Efficient and dean Coal fired Power Plant Boileis(Harbin Boiler Works Co.,Ltd.),Harbin 150046,China)

机构地区：[1]高效清洁燃煤电站锅炉国家重点实验室(哈尔滨锅炉厂有限责任公司),哈尔滨150046

出　　处：《黑龙江电力》2022年第6期547-549,共3页Heilongjiang Electric Power

摘　　要：对某电厂超临界锅炉后墙水冷壁的低合金螺纹管样品进行了试验分析,主要包括样管原始母材的化学成分分析、硬度值、显微组织及晶粒度检测,并对焊缝处的原始硬度和显微组织进行检测,均未见异常。综合分析水冷壁螺纹管发生泄漏原因,即在锅炉运行期间发生过长时超温,管子显微组织发生相变,性能下降所致。The test analysis was conducted on the samples of low alloy threaded tubes for the water wall of the rear wall of a supercritical boiler in a power plant, mainly including the chemical composition analysis, hardness value, microstructure and grain size of the original base metal of the sample tubes. The original hardness and microstructure of the welds were tested, and no abnormality was found. Comprehensively analyze the causes of leakage of threaded tubes of water wall, which are caused by excessive temperature during boiler operation, phase transformation of tube microstructure and performance degradation.

关 键 词：水冷壁 对接焊缝 显微组织相变 超温 

分 类 号：TM621.2[电气工程—电力系统及自动化]