钢包底吹氩性能优化水模型试验

Study on Optimization of LF Argon Blowing at Ladle Bottom by Hydraulic Model

利用水模型模拟了本钢炼钢厂精炼过程的吹氩工艺,研究了优化吹氩孔布置方案对钢液混合效果的影响,以及吹气量大小对混匀时间以及夹杂物的影响。结果表明:在电极圆以外区域可以找到比现行吹氩位置混匀效果更优的双气孔吹氩孔布置方案,混匀时间明显缩短;当吹气孔位于钢包底部1/2R半径上时,两个气孔夹角为30°吹气效果最优;当吹气孔位于钢包底部2/3R半径上时,气孔夹角为150°吹气效果最优;在条件相同的情况下,位于1/2R圆上的双透气砖组合的混匀效果整体上优于位于2/3R圆上的双透气砖组合;钢包底吹氩时的透气量大小要适中,气量过大时对提高溶液混合效果贡献不大,且气量过大会产生明显的卷渣现象。

The hydraulic modle of refining LF argon blowing of Benxi Iron and steel Co. was simulated, the effects of optimization argon blowing method on mixing time of molten steel was studied at the same time. In addition, the influence of quantities of gas supply on mixing time of molten steer and inclusion was investigated. The results show that： the optimization argon blowing method can be gained besides the electrode collar area, which is the position of present ladle argon blowing. The mixing time of molten steel can be reduced obviously by adopting the optimization argon blowing method. In addition, the mixing effects of molten steel is the best when two permeable bricks work as 30° included angle and the posi- tion is simultaneously located in the 1/2 radius, besides, the included angle is 150°if the position is located in the 2/3 radius. Moreover, the mixing effects of permeable bricks lying 1/2 radius has obvious superiority compared with permeable bricks lying 2/3 radius under the same condition. The quantities of gas supply should be properly, too much amount of gas has no obvious effect on the mixing time, on the contrary, too much amount of gas can lead the slag into the molten steel.