板坯连铸中间包结构优化的研究

结合某公司双冲击点板坯中间包生产现状,利用水模实验对中间包内钢水流动特性进行了研究.结果表明：原中间包结构存在明显的短路流,钢水停留时间偏短,死区体积分率偏高,不利于夹杂物上浮去除.同时,由于在高度较大的两湍流控制器间钢水不能流出,影响金属收得率.这种具有双冲击点的中间包,应按照对称的两个单流板坯中间包进行结构优化.采用小高度湍流控制器加上下挡墙的控流方式时,由于钢水流经路径增长和全混流体积分率增加,响应时间增长,死区体积分率显著减小至15%以下,有利于夹杂物上浮去除.同时,将小高度湍流控制器和门式开孔导流坝相结合,残钢量显著减小,有利于提高金属收得率.

Study on optimization of tundish configuration in slab continuous casting

Fluid flow characteristics of the slab tundish with double impact points was studied by water modeling experiment based on the practical production of certain plant. The results showed that there is obvious short circuited flow that resulted in a short residence time and higher dead volume ratio, which is harmful to removal of inclusions. In addition, there is appreciated residual liquid steel due to the two higher turbulent inhibitors. The configuration optimization of the tundish should be carried out according to the single strand tundish. By using of the lower turbulent inhibitors with weirs and dams, the flow path is prolonged and the volume fraction of complete mixing flow can be increased. As a result, the minimum residence time is obviously increased, and the dead zone volume fraction is decreased up to lower than 15% , which is favorable for the removal of inclusions and increase of yield ratio of molten steel.