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通过水模型研究了国内某厂150t钢包双透气砖底吹氩位置及流量对钢液混匀时间的影响,利用优质真空泵油模拟钢包顶渣,对不同吹气位置及吹气流量下钢液裸露面积进行了比较。结果表明,双孔夹角180°、吹气孔位于各自半径0.6R圆周上(吹气孔11和15)时混匀时间短且钢液裸露面积小,同时对包壁冲刷更小。钢包改造后工业试用表明,通过优化钢包透气砖位置及钙处理后钢液软吹氩流量及时间,钢液钙处理增氧质量分数降低28×10-6,降幅达78%;钢液出LF全氧质量分数降低34×10-6,降幅为45%,全氧含量控制水平明显提高。
Through the water model, the influence of argon blowing position and flow rate on the mixing time of the molten steel at the bottom of 150t ladle double air-permeable brick in a certain plant in China was studied. The molten slag was simulated at different blowing positions and blowing air flow by using high quality vacuum pump oil. Areas were compared. The results show that when the angle between the two holes is 180 °, the blowing holes are short on the circumference of 0.6R (blowing holes 11 and 15) and the exposed area of the molten steel is small, and the wall erosion is smaller. Industrial trial after ladle transformation showed that by optimizing the position of the ladle and the soft argon blowing flow and time of molten steel after calcium treatment, the aerobic mass fraction of molten steel decreased by 28 × 10-6, down by 78% Total oxygen content decreased 34 × 10-6, a decline of 45%, the level of total oxygen control increased significantly.