板坯连铸结晶器液面波动行为数值模拟

Numerical Simulation of Fluctuating Behavior of Liquid Level in Slab Continuous Casting Mould

以转炉厂一台板坯连铸机为研究对象,生产铸坯断面为230 mm×1 255 mm,运用ANSYS分析软件建立结晶器三维流动—传热耦合模型研究结晶器内钢渣界面波动,主要考虑了水口倾角、浸入深度和侧孔面积等工艺参数对界面波动的影响。结果表明,工况条件下液渣波动过大的原因是水口内径偏小造成结晶器内钢流速度过大;侧孔倾角的增大,液渣波动明显减弱,综合考虑倾角在20°～25°较适合;浸入深度在140～160 mm变化时,其对液渣波动影响较小;随侧孔面积的增大,液渣波动反而增大。

Taking a slab caster with slab section of 230 mm × 1 255 mm in Converter Plant as the research object, the three-dimensional flow-heat transfer coupling model was established by ANSYS analysis soft- ware to study the steel-slag interface fluctuation in the mould. The influence of process parameters such as noz- zle inclination, immersion depth and side hole area on interface fluctuation were considered. The results showed that the excessive fluctuation of liquid steel and slag under working conditions was due to the excessive velocity of steel flow in the mould caused by the small inner diameter of nozzle. With the increase of the inclination of the side hole, the liquid steel-slag fluctuation was obviously reduced, and the inclination should be more suitable in 20°-25°. When the immersion depth changes from 140 to 160 ram, it has little influence on the liquid steel-slag The liquid steel-slag fluctuation will increase with the increase of side hole area.