Abstract:  In view of the low free-opening rate of 100 t Electric Arc Furnace （EAF） in a factory， using Fluent software to study the flow characteristics of liquid bath with different deflection angles of oxygen lance. It is found that when the deflection angle of oxygen lance increases from 0° to 30°， the EBT dead zone is virtually eliminated， but the impact strength of molten steel on furnace wall increases by 148.4%. In order to balance the impact strength of furnace wall and liquid bath stirring， the optimization scheme of 1^#， 3^# and 4^# oxygen lance deflection of 10° and 2^# oxygen lance deflection of 30° is determined. The practice shows that the free-opening rate increases from 75.2% to 95.6%， the average tapping temperature is reduced by 6 ℃.The application data on ML08Al steel show that the end-point oxygen in molten steel is reduced by 20.9%， and the end-point T.Fe content mass fraction in slag is reduced by 21.6%.

Key words: Electric Arc Furnace, Oxygen Lance, Numerical Simulation, Deflection Angle, Liquid Bath Stirring

摘要： 针对某厂100 t电弧炉出钢自开率低的问题，使用Fluent软件研究了炉壁氧枪不同偏转角度下的熔池流动特性。研究发现，当氧枪偏转角度由0°增加至30°后，基本消除了EBT死区，但钢液对炉壁冲刷强度提高了148.4%。为了平衡炉壁冲刷和熔池搅拌，确定1^#、3^#、4^#氧枪偏转10°，2^#氧枪偏转30°的优化方案。实践应用表明，优化后电弧炉出钢自开率由75.2%增加到95.6%，平均出钢温度降低6 ℃；在ML08Al钢上的应用数据表明，终点钢水氧质量分数降低20.9%，终点炉渣T.Fe质量分数降低21.6%。

关键词: 电弧炉, 氧枪, 数值模拟, 偏转角度, 熔池搅拌