连铸中间包内夹杂物去除行为的物理模拟

Physical Modeling of Inclusion Removing Behavior in Continuous Casting Tundish

通过选择乳状液滴模拟夹杂物和连铸中间包物理模型实验,考察了换钢包过程中,中间包初始液面高度、长水口注入流量及控流装置对中间包内夹杂物去除行为的影响规律.结果表明:中间包初始液面高度从工作液面的1/4到3/4过程中夹杂物去除率提高较快,3/4工作液面为较理想的换钢包操作液面;夹杂物的去除率随长水口注入流量的增加而增大,注入流量超过2.5m3h-1时,夹杂物去除效果明显改善;挡墙挡坝组合控流装置的去夹杂效果较无控流装置有明显改善,在此基础上加入抑湍器后,去夹杂效果明显改善.

The effects of the initial molten steel level in tundish,filling flowrate through long nozzle and flow control devices on removing inclusions from continuous casting tundish during ladle changing were investigated via physical model testing with emulsion drops used to simulate inclusions.The results showed that the inclusions removed quickly in the range from 1/4 to 3/4 of the full depth which is calculated from the initial molten steel level in tundish,and the level of 3/4 of full depth seems to be an ideal working level for ladle changing.The inclusion removal rate increases with the increasing of the filling flowrate through long nozzle,and the removal of inclusions is improved significantly if the filling flowrate is higher than 2.5m3/h.The removal of inclusions is further improved in tundish with a flow control device containing dam/wall especially a turbulence inhibitor used.