超超临界电站锅炉水冷壁管横向开裂原因分析  

Analysis on the Causes of Transverse Cracking of Waterwall Tubes in Boilers of Ultra-supercritical Power Plants

作　　者：白哲 陈晓龙 杨元成 BAI Zhe;CHEN Xiaolong;YANG Yuancheng(Jinshan Thermal Power Branch of Shenyang Jinshan Energy Co.,Ltd.,Shenyang 110100;China Energy Science and Technology Research Institute Co.,Ltd.,Nanjing 210046;Taiyuan Boiler Group Co.,Ltd.,Taiyuan 030008)

机构地区：[1]沈阳金山能源股份有限公司金山热电分公司,辽宁沈阳110100 [2]国家能源集团科学技术研究院有限公司,江苏南京210046 [3]太原锅炉集团有限公司,山西太原030008

出　　处：《电力安全技术》2024年第4期60-63,共4页Electric Safety Technology

基　　金：山西省科技重大专项“超低温热管式空气预热器关键技术及工程示范”(202001101014)。

摘　　要：煤电机组锅炉受热面的频发性开裂和失效是制约机组灵活高效运行的重要因素之一。利用宏观检查、金相实验、微观形貌分析、能谱分析、硬度检测等方法,深入研究超超临界电站锅炉水冷壁管横向开裂问题,分析问题产生原因,阐明水冷壁的开裂机理,提出了缓解水冷壁热膨胀、热疲劳的运行调整建议,完成燃煤机组灵活性调峰安全评价创新实践。Frequent crackings and failures of boiler heating surfaces are one of the important factors that restrict the flexible and efficient operation of coal-fired power units.Multiple methods such as macroscopic inspection,metallographic experiments,microscopic morphology analysis,energy spectrum analysis,and hardness testing are applied to carry out in-depth research on the transverse cracking phenomena of waterwall tubes in boilers of ultra-supercritical power plants.Analysis is conducted on the causes of such problems,the cracking mechanism of waterwall is illustrated,and suggestions on operational adjustment are proposed to mitigate thermal expansion and fatigue of waterwall.Innovative practices in the safety evaluation of flexible peak regulation for coal-fired units are completed.

关 键 词：超超临界锅炉 水冷壁管 横向开裂 壁温 

分 类 号：TM621.2[电气工程—电力系统及自动化]