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针对攀钢200 t钢包,结合物理模拟与数值模拟,研究了一定底吹氩流量和时间条件下钢水流动行为与夹杂物去除率的关系.结果表明,夹杂物去除率受气泡、旋涡和液面速度影响.当吹氩流量从4 Nm3/h增加到5 Nm3/h时,气泡尺寸增大,夹杂物去除率降低;当从5 Nm3/h增加到12 Nm3/h时,气泡数增加,搅拌能增大,夹杂物去除率升高;但超过12 Nm3/h后,受旋涡影响,液面速度增大引起回流惯性力增加,夹杂物去除率反而降低.合理的吹氩流量为9~12 Nm3/h,吹氩时间为8~10 min.该条件下钢水经吹氩去夹杂物后,钢中全氧低于25?10?6(?).
According to the physical and numerical simulation of 200 t ladle in Panzhihua Iron and Steel Co Ltd, the relationship between the flow behavior of molten steel and the removal rate of inclusions under certain flow rate and time of argon blowing was studied. The results show that the removal rate of inclusions is affected by bubbles, vortex and liquid surface When the argon flow rate is increased from 4 Nm3 / h to 5 Nm3 / h, the bubble size increases and the inclusion removal rate decreases. When the flow rate increases from 5 Nm3 / h to 12 Nm3 / h, the bubble number increases and the stirring rate increases Can increase the inclusion removal rate increased; but after more than 12 Nm3 / h, by the vortex, the liquid surface velocity increases caused by the return inertial force increases, inclusions removal rate but decreased reasonable argon flow rate of 9 to 12 Nm3 / h, argon blowing time is 8 ~ 10 min. Under this condition, the molten steel is less than 25? 10? 6 (?