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夹杂物含量对钢材的力学性能有着极大的影响,钢包下渣是连铸过程中外界夹杂物引入的主要途径,对下渣过程的预防和控制是连铸生产的关键问题。采用分散相粒子模型模拟了底注式连铸钢包内金属液与渣粒混合相的运动过程。对随机选取的30个渣粒子的随流运动进行了全程跟踪,研究了渣粒运动的两个阶段:表层汇聚阶段和快速卷入下行阶段。结果发现,单个渣粒子的运动具有随机性,而渣粒子群的整体运动行为具有统计学特征。在此基础上分别研究了渣粒大小和渣粒密度对钢包下渣高度及下渣时间的影响,发现渣粒尺寸对平均下渣高度和平均下渣时间的影响显著,而渣粒密度对下渣过程的影响较小。
The content of inclusions has a great influence on the mechanical properties of steel. Slag under ladle is the main way to introduce foreign inclusions in the continuous casting process. The prevention and control of the slag during the continuous casting process is the key issue of continuous casting. Dispersed phase particle model was used to simulate the movement process of mixed phase of molten metal and slag particles in the bottom-injection continuous casting ladle. The random movement of 30 slag particles was tracked all the way. The two phases of slag particle movement were studied: surface aggregation and rapid entrainment. It is found that the motion of a single slag particle is random, while the overall motion of slag particle swarm has statistical characteristics. On this basis, the effect of slag size and slag density on slag height and slag-down time were studied respectively. It was found that slag size had a significant effect on average slag height and average slag time, The impact of the slag process is small.