Abstract: The supersonic jet behavior of multi-hole top lance was described with the compressible model, and the prediction was validated by the previous measured results. Combined with the VOF and Lagrange multi-phase flow models, the flow field and mixing time of the converter were described, and the arrangement of bottom tuyeres was optimized. The results show that the mixing time of the pure top-blown converter is about 523 s, and the molten steel flow at the bottom of converter is weak. After performing bottom blowing, the molten steel flow velocity at the bottom of the converter increases exponentially and the mixing time is reduced to 99 s. The mixing efficiency using 3 bottom tuyeres is better than the case of 2 or 2 bottom tuyeres. The optimum range of the location of bottom nozzle away from the axis is 0.3D~0.4D, and the location should be closer to 0.4D.

Key words: top and bottom combined blowing, converter, two-phase flow, mixing time, numerical simulation

摘要： 利用可压缩模型描述了四孔喷头顶吹超音速射流行为，并与前人实测结果对比验证了模拟结果. 通过耦合VOF和Lagrange模型对纯顶吹、顶底复吹炼转炉内熔池运动进行描述，并对炉底喷嘴数量、布置进行优化. 结果表明，在纯顶吹条件下，熔池的混均时间为523 s，炉底区域钢液流动微弱. 加入底吹氩气后，底部钢液速度增大，熔池混均时间为99 s. 炉底采用3个喷嘴的熔池混合效率要好于2个或4个的情况. 底吹喷嘴距离炉底轴心在0.3D~0.4D区间内最佳，且应偏近于0.4D区域.

关键词: 顶底复吹, 转炉, 两相流, 混均时间, 数值模拟