加热功率对感应加热中间包影响的数值模拟

通道式感应加热是实现中间包低过热度浇铸有效方法之一,针对国内某钢厂单流通道式感应加热中间包,建立三维非稳态数学模型,研究通道加热功率对中间包内流场、温度场及夹杂物去除的影响规律。结果表明, 当中间包未受感应加热或加热功率超过800 kW时,钢水流动特性均较差;当通道加热功率为300、600或700 kW时,钢液流动特性良好。当中间包无感应加热时,浇铸区出现明显的温度分层现象;当加热功率为500~700 kW时,浇铸区温度分布均匀且基本消除了其右上方及右下方区域的温度分层。当加热功率在400~700 kW时,夹杂物去除率呈上升趋势;但当加热功率超过700 kW后,夹杂物去除效果变差,700 kW为最佳去夹杂加热功率。

Numerical simulation for effect of heating power on induction heating tundish

Channel induction heating is one of the effective methods to realize low superheat pouring of tundish. On the basis of an one-strand channel-type induction heating tundish used in a steel mill, a three-dimensional unsteady-state mathematical model was built to study the influence of channel heating power on the flow field, temperature field and inclusion removal in the tundish. The results show that when the tundish is not heated by induction or the heating power exceeds 800 kW, the flow characteristics of molten steel are poor. When the channel heating power is 300, 600 or 700 kW, the flow characteristics of molten steel are good. When the tundish is not subjected to induction heating, obvious temperature stratification occurs in the casting zone. When the heating power is between 500 and 700 kW, the temperature distribution in the casting zone is uniform and the temperature stratification in the upper right and lower right areas is basically eliminated. When the heating power is between 400 and 700 kW, the removal rate of inclusions shows an upward trend. The effect of inclusion removal will be worse when the heating power exceeds 700 kW. Therefore, the optimal heating power is 700 kW.