耐材壁面夹杂物碰撞研究  

Study on the Collision of Inclusions on Refractory Wall

作　　者：赵定国 王育飞 王书桓 张福君 

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063009

出　　处：《钢铁钒钛》2017年第6期113-120,共8页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金项目(51304060)

摘　　要：分析了钢液流经连铸水口时钢液中夹杂物与耐材质吸附杆壁面之间的碰撞行为,建立了夹杂物碰撞模型。分析结果表明,回弹系数一定时,同尺寸夹杂物与壁面碰撞,垂直于壁面方向上夹杂物速度越大,最大压缩距离越大,回弹距离也越大,碰撞后越易回弹至钢液中;当回弹系数、夹杂物初速度一定时,不同尺寸的夹杂物与壁面碰撞,夹杂物的尺寸越小,对应的最大压缩距离越小,回弹距离也越小,夹杂物越易碰撞吸附在壁面。R=20μm Al_2O_3夹杂物与光滑壁面已附着夹杂物碰撞,当夹杂物速度一定时,压缩距离越大,壁面夹杂物临界接触域尺寸越大,壁面夹杂物越易脱落、滚动;与粗糙壁面附着夹杂物碰撞,当夹杂物速度方向与耐材壁面的夹角β>0.51°时,壁面夹杂物不会脱落、滚动。分析结果对研究连铸水口内耐材壁面对钢液中夹杂物的吸附具有指导意义。In this paper the behavi when the molten steel flows through or of collision between inclusions the continuous casting nozzle had in molten steel and refractory wall been investigated and thenthe mod- el of collision between inclusions had been developed. It is found out that when the coefficient of restitu- tion is constant, inclusions of same sizes collide with the wall. the greater the velocity of inclusion on the vertical wall direction, the greater the maximum compression distance and the greater the springback dis- tance, and the inclusions easily rebound into molten steel after the collision. When the coefficient of resti- tution and the initial velocity of inclusions are constant, inclusions of different sizes collide with the wall,, maximum compression distance and t the springbac creasing, therefore, inclusions are easily attached to k distance decrease with the size of the inclusion de- the refractory wall after the collision. When Al2O3 in- clusions with a radius of 20 μm collides with inclusions attachingwith a smooth wall, and the velocity of inclusions are constant,critical contact size of the inclusion attached to the refractory wall increases with the compression distance, resulting in high frequency of falling off or rolling of the inclusion are attached to the refractory wall. These inclusions collides with inclusions attached with a rough wall, when the angle between the direction of inclusions and the direction of the parallel wall is greater than 0.51°, the inclu- sion attached to the refractory wall will not fall off and roll. The results of the analysis are of significance to the study of adsorption of inclusions in molten steel by refractory wall in the continuous casting nozzle.

关 键 词：连铸 水口 耐材壁面 夹杂物 碰撞 

分 类 号：TF777[冶金工程—钢铁冶金]