空气预热器内部支撑焊口频繁开裂原因分析及改造

Cause Analysis of Frequent Cracking in Internal Support Welding Joint on Air Preheater and Its Transformation

内蒙古大唐国际托克托发电有限责任公司5号机组空气预热器烟气侧热端内部支撑连接处存在焊口开裂和扇形板大梁局部凹陷等问题,且每次出现缺陷位置均相同。通过对缺陷的长期跟踪观察,对多项影响因素进行分析,最终确定导致支撑出现问题的根本原因为支撑位置与原设计不符。按照原设计支撑安装位置改造后,焊口开裂缺陷彻底消除,保证了机组的安全稳定运行。

In Inner Mongolia Datang International Tuoketuo Power Generation Co.,Ltd.,the heating side support of No.5 unit air preheater is in the presence of the welding crack and the partial concave of the sector plate,and the position of each defect is the same.Through long-term observation and analysis of influence factors,finally find the root cause of these problems which is the installation support position is inconsistent with the original design for the support.After transformation according to the original design position,the weld cracking problem is completely eliminated,ensure the safe and stable operation of the unit.