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为了改善KR搅拌法脱硫剂浪费严重的问题,开发3种新型搅拌桨改善铁水和脱硫剂的混合效果。应用CFD技术,以速度场、湍动耗散率和混匀时间为特征,描述液面的卷入能力和内部混合能力。通过对比3种桨形与传统桨形(A桨)的铁水流动结构,分析结构参数和操作参数之间的影响规律。研究结果表明,方形桨(B桨)卷入脱硫剂的能力和改善混合效果强于其他3种桨形,随转速从60r/min增加到80r/min,柱状回转区体积减小60%,死区体积减小67%,混匀时间缩短52%;D桨的下倾角和径向斜边改善了搅拌桨下方死区混合效果,随转速从60r/min增加到80r/min,死区体积减小51%,混匀时间缩短48%;C桨的卷入能力和混合效果介于D桨和B桨之间;A桨效果最差。 相似文献
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KR搅拌技术的水模型实验研究 总被引:1,自引:0,他引:1
铁水炉外脱硫是现代化炼钢优化生产工艺流程不可缺少的环节,目前以KR法为代表的机械搅拌法脱硫和喷吹法脱硫是铁水脱硫的两种主要手段.本文根据宝钢鱼雷罐和铁水包喷粉脱硫的具体生产情况,对钢包单吹金属镁精炼过程中钢液的流动和混合特性作水模型研究.以130 t钢包为原型,设计、加工和建成了几何相似比为1:6的水力学模拟系统.利用相似原理进行KB过程水模型研究,以得到最佳的搅拌参数,指导现场操作.本实验中,采用安装有搅拌桨的浸入旋转喷嘴,设计有多个气体吐出口的浸入旋转喷嘴,以及在旋转搅拌桨的斜下方设置的浸入喷嘴等各种形式的喷嘴,向铁水内吹入镁蒸汽及输送气体的混合气,促进气泡微细化.通过这样的方法,即使使用少量的输送气体,对低的硫、氧浓度的铁水,也可以维持镁的精炼反应的高效率. 相似文献
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The gas- liquid two- phase flow in the KR method of hot metal desulfurization was simulated by the standard k- ?? turbulence model and the VOF multiphase flow model in the CFD software Fluent. The immersion depth and stirring speed of the agitator were studied for the vortex and liquid phase flow fields. The numerical simulation results are basically consistent with the water model test results. The results show that the vortex depth increases with the increasing of stirring speed, and the immersion of the stirrer is too shallow to cause ??cuffing?? phenomenon. When the stirring speed is increased from 120r/min to 200r/min, the average speed of molten iron increases by about 83%, the irregular flow inside the molten iron forms, and the axial flow is obviously enhanced. When the immersion depth of the stirrer is 187. 5mm, the difference in the average axial velocity of the molten iron is 0. 132m/s. The large speed difference is beneficial to the entrapment of the desulfurizer. When the stirring speed is 160r/min, volume ratio of the high- flow molten iron is large. 相似文献
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