600MW机组超临界“W”火焰锅炉水冷壁联箱管座角焊缝裂纹分析与对策  

Research and Analysis of Angle Welding Seam Split on the Water Wall Heater in a 600MW Supercritical“W”Shaped Flame Boiler

作　　者：陈一平[1] 于鹏峰[1] 吕当振[1] 李昌松 

机构地区：[1]国网湖南省电力公司电力科学研究院,湖南长沙410007 [2]国电南宁发电有限责任公司,广西南宁530317

出　　处：《锅炉制造》2015年第1期15-18,共4页Boiler Manufacturing

摘　　要：对国产600MW机组超临界"W"火焰锅炉水冷壁上联箱管座产生大量裂纹的原因进行了综合分析,并利用ANSYS应力软件对该联箱管座进行了胀差应力模拟计算。分析和计算结果表明,管屏管间壁温偏差大、设计不合理,在管座角焊缝出现大的交变胀差应力是产生裂纹的根本原因。在此基础上,提出了通过割除管间鳍片增加管座光管长度,改变联箱炉顶密封结构的方案,使问题得到成功解决。First of all,reasons of angle welding seam split on the water wall heater in a 600 MW Supercritical ＂W＂shaped flame boiler were analyzed in this study. Meanwhile,a stress analysis method was adopted to calculate alternating stress of the water wall heater by AYSYS. The results indicated that temperature differences of different tube panels and pipes based on the water wall heater inlet,and design problems about the heater structure together led to serious alternating stress on the water wall heater. In order to solve the angle welding seam split,decreasing the length of the fin on the water wall,and changing the sealing structure of the water wall heater were used. The operating results were worthwhile to lower the alternating stress of the water wall heater.

关 键 词：超临界“W”火焰锅炉 角焊缝 裂纹 应力分析 

分 类 号：TK223.12[动力工程及工程热物理—动力机械及工程]