基于CFD的钢渣风淬工艺参数分析与设计

Parameter analysis and design of steel-slag air quenching process based on CFD

针对钢渣风淬工艺参数受风速及粒化室布局等多因素影响,分析钢渣受高速气流冲击粒化和对流降温凝固过程,基于有限元仿真分析方法,建立多相流运动方程和风淬工艺有限元模型,结合钢渣样本物性参数实现液态钢渣风淬过程的数值模拟,得到不同粒径和风速下的换热凝固规律,验证了粒化室工艺布局等参数。数值模拟结果表明,考虑钢渣的相变潜热及飞行空气阻力等因素时,入射气流风速100 m/s时,小于等于3 mm粒径的渣粒3 s内表层即可凝固,渣粒主要落地范围20~35 m,满足粒化室工艺条件。

In view of the influence of many factors such as wind speed and granulation chamber layout, the two processes of the steel-slag air quenching process including liquid steel-slag being impacted by high-speed airflow and liquid steel-slag particles convective cooling and solidification were discussed, and the mathematical model of steel-slag air quenching and the multiphase flow equation considering turbulent shear stress transfer was established. Based on the finite element analysis method and substituting the physical parameters of the actual steel-slag sample, a finite element model of the air quenching process was established. Finally, through the numerical simulation of the liquid steel-slag air quenching process, the heat exchange and solidification laws of the steel-slag particles under different particle sizes and wind speeds were obtained, and the parameters of the granulation chamber process layout were verified. Numerical simulation results considering the latent heat of phase change of steel-slag and air resistance during solidification show that if the wind speed of the incident airflow is 100 m/s, the surface layer of slag particles less than or equal to 3 mm can be solidified within 3 s, and the slag particles mainly fall within the range of 20-35 m, which meets the process conditions of the granulation chamber.