超声波钢包精炼水模夹杂物行为

Behavior of Inclusion Removal in Ladle Refining Model by Ultrasonic

针对钢液中微小非金属夹杂物难以去除的问题,采用高速摄像机和速度分析软件对超声波钢包精炼水模内夹杂物粒子与空化气泡的相互作用行为进行了研究,结果表明:变幅杆式超声波产生的空化气泡形成时,在传振杆底端呈圆锥状分布,空化泡直径在1μm左右,远小于底吹气产生的气泡直径;随着超声功率增大,空化强度增大,生成空化气泡数量增多,气泡分散度增加,有利于去除微小夹杂物;瞬态空化气泡崩溃后,形成的小空化气泡吸附面积增大,与夹杂物碰撞概率增加,可促进夹杂物尤其是微小夹杂物的上浮排出;稳态与瞬态空化气泡均可促进夹杂物的上浮排出。

For removing fine inclusion in molten steel,the behavior of inclusion removal by cavitation bubbles and blowing through high-speed camera and velocity analysis software gas was investigated.The results show that: the collision probability between the inclusion and bubbles plays an important role in the inclusion removal;the diameter of the bubbles generated by blowing gas is greater which can be used to remove large inclusion but not to small inclusion;the diameter of cavitaton bubbles generated by ultrasonic is about 1 μm which is far smaller than that generated by blowing gas;with the increasing of the ultrasonic power,the cavitation intensity,the number of the bubbles and the collision probability increases,so the inclusion removal ratio increases;both stable and transient bubbles can promote the inclusion floating up from the solution.