Abstract

The variation characteristics of bubble morphology and the thermal-physical properties of bubble boundary in the top-blown smelting furnace were explored by means of the computational fluid dynamics method. The essential aspects of the fluid phase (e.g., splashing volume, dead zone of copper slag, and gas penetration depth) were explored together with the effect of sinusoidal pulsating gas intake on the momentum-transfer performance between phases. The results illustrated that two relatively larger vortices and two smaller vortices appear in the bubble waist and below the lance, respectively. The expansion of larger ones as well as the shrinking of smaller ones combine to cause the contraction of the bubble waist. Compared to the results of the case with a fixed gas injection velocity (V_g = 58 m/s), the splashing volume and dead zone volume of the slag under the V_g = 58 + 10sin(2πt) condition are reduced by 24.9% and 23.5%, respectively, where t represents the instant time. Gas penetration depth and slag motion velocity of the latter are 1.03 and 1.31 times higher than those of the former, respectively.

中文翻译：

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顶吹熔炼炉正弦脉动进气强化气渣动量传递的数值研究

摘要

利用计算流体力学方法探讨了顶吹熔炼炉内气泡形态的变化特征和气泡边界的热物性。探讨了流体相的基本方面（例如，飞溅体积、铜渣死区和气体渗透深度）以及正弦脉动气体进气对相间动量传递性能的影响。结果表明，气泡腰部和喷枪下方分别出现两个较大的涡流和两个较小的涡流。较大气泡的膨胀和较小气泡的收缩共同导致气泡腰部的收缩。与固定注气速度（ V _g = 58 m/s）情况下的结果相比， V _g = 58 + 10sin(2π t )条件下炉渣的飞溅体积和死区体积减少了24.9分别为 % 和 23.5%，其中t代表瞬时时间。后者的气体穿透深度和渣运动速度分别是前者的1.03和1.31倍。