基于壁温特征分析的超超临界锅炉垂直水冷壁变形拉裂问题诊断  

Study on Deformation and Cracking of Water Wall of Ultra Supercritical Boiler Based on wall Temperature Characteristics Analysis

作　　者：王文飚 杨希刚 马晓峰 陈国庆 WANG Wenbiao;YANG Xigang;MA Xiaofeng;CHEN Guoqing(China Energy Science and Technology Research Institute Co., Ltd., Nanjing 210023, China;School of Energy and Environment, Southeast University, Nanjing 210096, China)

机构地区：[1]国家能源集团科学技术研究院有限公司,江苏南京210023 [2]东南大学能源与环境学院,江苏南京210096

出　　处：《锅炉技术》2020年第6期1-6,72,共7页Boiler Technology

摘　　要：以某电厂660 MW超超临界垂直水冷壁锅炉为研究对象,采用现场试验的方法,分析了不同运行工况下垂直水冷壁的壁温分布特性,考察了水煤比、过热度、主汽压力等关键运行参数对水冷壁壁温波动的影响,指出水冷壁壁温分布不均而产生的应力是导致水冷壁拉裂与变形的主要原因,水冷壁壁温长期持续波动是导致水冷壁疲劳产生横向裂纹而断裂的主要原因。Taking a 660 MW ultra supercritical vertical water-wall boiler as the research object,the field tests were conducted to investigate the characteristics of wall temperature distribution under different operation conditions,and the influences of key operating parameters such as water-coal ratio,superheat degree,main steam pressure,etc.,on the water-wall temperature fluctuation were analyzed.It is found that the stress caused by uneven wall temperature distribution is the main cause of water-wall cracking and deformation.The water wall temperature fluctuates continuously for a long time,which give rise to the presence of transverse crack and breakage.

关 键 词：超超临界 水冷壁 变形拉裂 壁温特征 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程]