转炉顶吹过程渣-金-气三相作用特性

基于VOF界面追踪技术,建立了氧气转炉顶吹过程渣-金-气多相传输行为的数学模型,研究了渣-金-气三相界面行为,给出了渣/金界面特征的演化过程和熔池内流场变化特征,对冲击坑形态进行了具体的描述,并对穿透深度和冲击坑直径进行了定量化的表征。结果表明:由于冲击坑表面波的传播,冲击坑以及渣/金/气界面具有明显的瞬态特征且熔池是振荡的;钢液熔池内涡旋中心位置随着吹炼时间以及渣的运动而变化;低枪位加强了钢液表面的波动,增加了钢液表面的粗糙度,增大了射流与熔池的接触面积,从而有利于射流向熔池的动量传递,促进熔池的搅拌。

Slag-metal-gas interaction characteristics of top-blown BOF steelmaking process

Based on VOF interface tracking technique, a mathematical model of slag-metal-gas multiphase transport in a top-blow oxygen steelmaking convertor was developed. The interface behavior of slag-metal-gas and their evolution with blowing time were investigated. The flow field in bath and the shape of cavity were shown, and penetration depth as well as impact area was characterized quantitatively. The results show that the shape of depression and interface of slag-steel-gas are found to be instable and oscillatory with blowing time due to propagation of waves in cavities. The circulation of molten bath is formed, and the position of vortex changes with blowing time and interface movement. For low operating lance height, the fluctuation of steel surface is enhanced, the roughness of steel surface is increased, and the contacting area between jets and bath is increased. As a result, it is helpful for momentum transfer from jets into bath and therefore the favorable stir of bath.