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以一种150t椭圆形钢包为原型建立1∶4的钢包水模型,在相似原理基础上,以氮气模拟现场用氩气进行底吹,以水模拟钢液,进行水模型实验.分析了底吹气孔位置、吹气量对钢液混匀及流动的影响.结果表明:原型方案两吹气孔位置距离近,相互干扰性强,动能耗散大,影响钢液搅拌效果.底吹气量存在临界值(327.6L·h-1),超过临界值后气量增加的动能主要消耗在鼓动液面和吹开渣面上,对钢液混匀的效果较小.优化后两底吹气孔分别位于长轴0.6R处,呈180°分布,优化后钢液混匀时间整体下降,相同吹气量下混匀效果更好.采用优化后方案,相同吹气量下钢液面裸露面积大大降低,减少了钢液二次氧化,钙处理过程全氧从58×10-6降低到47×10-6,软吹过程平均增N量<3×10-6.
A ladle model of 1: 4 ladle was established by using a 150t oval ladle as a prototype. Based on the similar principle, nitrogen was used to simulate the bottom blowing of argon in the field and water was used to simulate the molten steel. The bottom blowing The results show that the distance between the two blowing holes of the prototype scheme is close, the mutual interference is strong, the kinetic energy dissipation is large, and the mixing effect of the molten steel is affected. There is a critical value at the bottom blowing gas 327.6L · h-1). After exceeding the critical value, the kinetic energy of the increase of gas volume is mainly consumed on the agitation liquid surface and on the blown-out slag surface, and the mixing effect on the liquid steel is small.Optimized, the two bottom blow holes are located on the major axis 0.6 R at 180 °, the overall mixing time of the molten steel decreases as a whole after the optimization, and the mixing effect is better under the same blowing capacity.The exposed area of the molten steel is greatly reduced at the same blowing capacity with the optimized scheme, In the secondary oxidation and calcium treatment, the total oxygen decreased from 58 × 10-6 to 47 × 10-6, and the average amount of N increased by soft blowing was less than 3 × 10-6.