250t转炉托圈配管工艺孔处开裂原因分析与改造

Cause analysis of cracks formed around the piping process hole of the 250 t converter trunnion ring and its revamp

针对武钢炼钢总厂250t转炉托圈配管工艺孔处开裂漏水且反复局部修补无法根治的问题,采用CAE技术对转炉整体进行了热应力仿真分析。仿真结果表明,托圈配管工艺孔处存在应力集中,该处的热应力明显高于托圈的其他部位,是导致该处经常开裂的根本原因。为此,将配管进行了改道设计,改善了托圈的局部结构,降低了托圈的应力集中现象,使该转炉托圈的漏水难题得到了彻底根治。

In view of the problem of the hole crack leaking of the 250tconverter trunnion ring piping process,which couldn′t completely resolved although the topical patching was done again and again,the simulation analysis on the thermal stress of the converter was made by CAE technology.The results showed that the stress concentration at converter trunnion ring piping process hole,where thermal stress was significantly higher than other parts of the converter ring,was the fundamental cause of cracking. Therefore,the design of changing the piping＇s route was made,and local structure of converter trunnion ring was revamped,which reduced the stress concentration and com- pletely resolved the converter ring leakage problem.