钢水罐瞬态温度场及应力场分析

Analysis of Transient Temperature Field and Stress Field of Ladle

对某钢厂300t钢水罐进行瞬态温度场分析,得到了罐壁上关键节点温度随时间变化曲线和罐壁厚度方向上温度分布图。根据冶金工业部发布的《炼钢安全规程》中规定:要定期检查钢水罐,耳轴磨损大于耳轴直径的10%时应按规定进行检修或报废。故针对钢水罐的关键受力部件耳轴未磨损与磨损其直径的10%两种情况分别分析,将温度场结果作为初始条件进行热应力分析,然后将两种情况下得到的应力场对比分析。结果表明:磨损后的耳轴局部应力场最大应力值达到96.6MPa,较未磨损时应力增幅达73%。耳轴磨损其直径的10%后继续使用会对生产安全产生影响,日常维护和使用中重点关注耳轴磨损,定期检查其磨损情况并及时修复,有助于延长钢水罐寿命。

The transient temperature fields of a 300t ladle are analyzed. From the analysis, the curve of temperature of key nodes on the ladle wall changing with time and temperature distribution on thickness direction of the ladle wall can be obtained According to the stipulation in ＂steel safety regulations＂ issued by the Ministry af Metallurgical Industry： the ladle should be checked regularly, the trunion ＂should be repaired or scrappd when its wear is greater than 10% of its diameter. Aimed at the trunnion, the key bearing component of a ladle, two cases are analyzed. One is the origin model, and the other is the model with the trunnion wore 10% of its diameter. Temperature fields are used as the initial conditions for ladle thermal stress analysis to get two thermal stress fields. Comparing two stress results, some conclusions can be obtained. The wear of trunnion has a signifwant impact on the stress field, and the maximum stress is up to 96.6MPa, and this value is up to the permissible stress of the material. The growth rate of the maximum stress is 73%. Continuning using trunnion after it wore 10% of its diameter will have impact on production safety. So it is important to pay attention to the influence of wear of trunnion made on the life of the ladle in routing maintenance and applicatior. To extend the service life af the ladle, it is necessary to do regularly check and repair in time.