100 t电弧炉熔池搅拌工艺优化模拟及应用

Optimization and Simulation of Stirring Process for 100 t Electric Arc Furnace Bath and Its Application

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%。

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%.