七流中间包的结构优化与数值模拟

Numerical simulation and structure optimization in seven-strand tundish

通过对改进前后的中间包进行了温度场、流场的数值模拟分析,得出了改进后的中间包存在着以下优点:1)在垂直方向上,各流水口之间钢水的最大温度差由4.11℃减小到1.44℃,温度更加均匀;2)各流水口出口处钢水的最大温度差由2.42℃减少到了0.78℃,意味着进入中间包的钢水温度可以下降1.64℃,仍能保证各流浇铸顺利;3)中间包容量由35t增加到了40t,钢水在中间包的停留时间由8.6min增加到9.7min,有利于夹杂物去除;4)中间包钢水的流场速度梯度小,可以有效耗散大包注流区的冲击能量,对耐材的侵蚀减小;5)由于速度场和温度场趋于合理,使得包底和包壁0.4m以下位置的耐火材料冲蚀区显著减少;6)钢水的冶炼成本下降0.46元/t。

The temperature field and flow field of the tundish before and after improvement were analysied by numerical simulation.The reformed tundish has the advantages as below:1)the maximal temperature difference of liquid steel in the vertical direction of tundish between different nozzle is reduced from 4.11 ℃ to 1.44 ℃ and the temperature of liquid steel in tundish is more homogenized;2)the maximal temperature difference of liquid steel between the different exit of tundish is reduced from 2.42 ℃ to 0.78 ℃,that means the casting operation still can be smooth when the temperature of liquid steel into tundish is reduced by 1.64℃;3)the capacity of tundish is changed from 35 tto 40 tand retention time of liquid steel in the tundish is increased from 8.6 min to 9.7 min,that is good for inclusion removing;4)the velocity gradient of liquid steel in the flow field is so small that the impact energy can be dissipated,the souring of the tundish refractory is decreased;5)the velocity and temperature field is so reasonable that the souring of the refractory in the bottom and the side between 0 to 0.4 mis decreased greatly;6)the product cost of molten steel is decreased by 0.46 yuan per ton.