Abstract: Based on theory of similarity,the powder injected through top lance in RH-PTB vacuum refining has been simulated using 1:9 water model ladle(diameter-0.43 m,height to water surface-0.45 m)to study the effect of top lance gas flow rate,lifting gas flow rate of up-leg and height of top lance on injecting powder mixing time in liquid. The results showed that with top lance gas flow rate increasing,the injecting powder mixing time in liquid increased and had maximum value; with lifting gas flow rate of up-leg increasing,the mixing time quickly decreased and as lifting gas flow rate was ≥15 L/min,the mixing time was no longer decreasing; the effect of height of top lance on mixing time was definite,therefore in operation,according to specific circumstances to adjust height of top lance decreasing powder mixing time.

Key words: RH-PTB Vacuum Refining, Powder, Mixing Time

摘要： 根据相似理论,用1∶9水模型钢包(直径0.43m,水面高度0.45m)模拟RH-PTB真空精炼水冷顶枪喷粉技术,研究顶枪气量、上升管提升气量、顶枪枪位高度对粉剂混均时间的影响。结果表明,随顶枪气量增加,粉剂在液体中均混时间增加,并具有最大值;随提升气量增加,均混时间迅速减少,但当提升气量≥15L/min时,均混时间不再继续减少;顶枪枪位对均混时间有一定影响,实际操作中,应根据具体情况,调整顶枪枪位,以减少粉剂均混时间。

关键词: RH-PTB真空精炼, 粉剂, 均混时间