数值模拟氧气底吹熔炼工艺参数优化

采用数值模拟方法，分别研究熔池深度、气体流量、氧枪倾角、氧枪直径等参数变化对熔池气含率、熔体平均速度和平均湍动能的影响.结果表明:当熔池深度为1.3~1.5 m时，熔池内部气液两相搅拌强烈，气含率存在较大值为17.5 %，熔池处于较好的运动状态；气含率、熔体平均速度和平均湍动能随气体流量的增加呈现先减小后增大趋势，选取适宜气体流量为0.6~0.7 kg/s；熔池气含率随氧枪倾角的逐渐增大先增大后减小，而熔体平均运动速度和平均湍动能呈现先减小后增大趋势，选取适宜氧枪倾角为20°~25°；氧枪直径为30~35 mm时，熔池气含率和平均湍动能处于较大值，约为13 %和0.8 m2/s2，熔池处于较好的运动状态. 

Numerical simulation and parameter optimization of oxygen bottom blowing smelting process

Using numerical simulation method, the influences of bath depth, gas flow and oxygen lance inclination, as well as lance diameter on gas holdup, melt average velocity and turbulent kinetic energy are studied respectively. The results show that, when the bath depth is around 1.3~1.5 m, the gas-liquid phase in the bath is agitated strongly and the bigger bath gas rate is 17.5 %. The bath motion is in the better state. With the gas flow increasing, the bath gas rate, melt average velocity and average turbulent kinetic energy decrease firstly, and then increase. The optimal parameter is in the range of 0.6~0.7 kg/s. The bath gas rate increases first and then decreases as oxygen lance inclination increases, while the melt average velocity and average turbulent kinetic energy decrease first and then increase. The proper parameter is in the range of 20°~ 25°.When the lance diameter is in the range of 30~35 mm, there exist bigger values for bath gas rate and turbulent kinetic energy which are 13 % and 0.8 m2/s2 respectively. At this moment, the bath motion is in the better state.