LF-RH工艺生产超低硫钢钢水温度预报模型

Temperature prediction model of molten steel during LF-RH process for ultra-low sulphur steel

根据LF-RH精炼超低硫钢的工艺流程,基于冶金热力学、传热和热量平衡等原理,同时考虑钢包的热状态,建立出钢至浇注过程中的钢水温度预报模型。通过该模型可以得到不同时刻钢水温度和钢包内衬温度的分布曲线。实例验证结果显示,模型计算值与实测值的平均误差为5.6℃,误差在±8℃以内的占87.5%。另外,运用该模型分析了钢包热状态、出钢过程、传运时间、RH真空室内壁温度等因素对钢水温度的影响规律,可为超低硫钢精炼工艺的优化提供参考。

According to the process flow of LF-RH refining for ultra-low sulphur steel,a temperature prediction model of molten steel from tapping to teeming is developed based on metallurgical thermodynamics,heat transfer and thermal equilibrium principles as well as the thermal state of the ladle.It can provide temperature values of molten steel and temperature distribution in the ladle lining at any instant.The results of model verification show that,average error between the calculated and measured values is 5.6 ℃ and 87.5% of the error values are less than ±8 ℃.In addition,effects of ladle thermal state,tapping process,transport time and temperature of internal surface in RH vacuum chamber on molten steel temperature are analyzed by using this model,which are shown as reference for optimizing the refining process of ultra-low sulphur steel.