预热温度对钢包盛钢时的内衬温度及应力影响

为了确定合适的钢包烘烤预热温度,以某钢厂90t整体铝镁浇注料钢包为原型进行数值模拟,利用有限元分析软件ANSYS,采用间接耦合法进行计算,得出了不同烘烤预热温度工况下,钢包盛钢时的内衬温度变化及应力分布。结果表明:提高钢包预热温度可以降低钢包内衬的温升及钢液温降幅度,减小钢包内衬的温度梯度,减少内衬材料受热应力所引起的热震破坏,从而延长钢包使用寿命。综合考虑钢包内衬水分排除、节能及热应力分布等因素,钢包预热温度取1 173~1 273K最佳;钢包底部的烘烤预热温度应提高到1 373K。

Effect of preheating temperature on stress and temperature of ladle lining during the molten steel holding process

In order to determine the appropriate preheating baked ladle temperature, taking a 90 t monolithic alumina magnesia castable ladle as a prototype to do the numerical simulation, using the finite element analysis software ANSYS and indirect coupling method, results of stress distribution and temperature change of Ladle lining during steel holding under the different preheating baked ladle temperature are obtained. The results indicate that improvement of ladle preheating temperature can reduce the range of both ladle lining elevated temperature and molten steel dropped temperature, decrease the temperature gradient of ladle lining, mitigate the thermal shock damage of lining materials caused by heat stress and extend the service life of steel ladle. Since a comprehensive consideration of ladle lining moisture removal, energy saving and thermal stress distribution and other factors, the optimal ladle preheating temperature is 1 173-1 273 K. The preheating temperature of ladle bottom should be increased to 1 373 K.