底吹氩钢包表面流速与液面波动的物理模拟

针对国内某厂150 t双孔底吹氩钢包,根据相似原理建立几何比例为1：3的水力学模型,进行钢包表面流速及液面波动行为的模拟研究,得出了不同吹氩流量下,不同吹氩位置的钢包表面流速,平均及瞬时波高的变化规律.结果表明：原型钢包内,两吹气流股造成整个液面的波动情况不均匀,靠近包壁一侧扰动更剧烈,更容易形成卷渣,钢水临界韦伯数为6.039,相应表面流速为0.420m.s-1,液面平均波高达到最大值为0.303 cm.方案1/3R＋0.64R-180°和0.5R＋0.5R-135°下,开始发生卷渣的钢水临界韦伯数分别为4.646和7.484,相应表面流速为0.368 m.s-1和0.468 m.s-1.钢液表面流速随着吹气量的增加呈上升趋势,但并不是线性关系.

Physical Modeling on Surface Flow Velocity and Level Fluctuation in the Ladle with Bottom Argon Blowing

According to the similar principles,hydraulics model experiments have been carried out in a 1/3 scaled down of 150t ladle of some steel plant to study the surface flow velocity and surface fluctuation.The surface velocity and average level fluctuation,local instantaneous level position for the slag entrapment were investigated under different gas flow in the prototype and optimized ladle.The resuits shows that in the prototype ladle the fluctuation caused by the two gas flow was uneven and became bigger closed to the ladle wall which tended to cause slag entrapment.For the prototype case,the critical We was 6.039 and the corresponding surface velocity was 0.420 m · s-1while the maximum average fluctuation was reached to 0.303cm.For the other two cases,1/3R＋0.64R-180° and 1/2R＋1/2R-135°,the critical We were 4.646 and 7.484,while the corresponding surface velocities were 0.368 m · s-1和 0.468 m · s-1separately.With the increase of gas rate,the surface flow velocity was increased,but there was no simple liner relationship between them.