“精炼渣-钢液-夹杂物-合金-耐火材料-空气”多元体系下钢中非金属夹杂物瞬态现象的基础研究

During the refining of liquid steels, various alloys were added to the molten steel, the thermodynamics for the formation of inclusions and the kinetic evolution in the amount, composition, size of inclusions were very complicated. In the current study, laboratory experiments, thermodynamic calculation, kinetic modeling, mathematical simulation, physical modeling, and plant trials will be performed. Firstly, a more complete and more accurate thermodynamic database for the formation of inclusions by complex deoxidation will be established. Secondly, the kinetic evolution in the composition of liquid steel, slag and inclusions, the nucleation and growth of inclusions and the evolution in the amount and size of inclusions under a multiple system of “slag-steel-inclusion-alloy-refractory-air” will be investigated. Thirdly, during the solidification of the steel and the cooling of continuous casting slabs, the evolution in the composition and size of inclusions will be theoretically and experimentally studied. Finally, by coupling the three-dimensional macro-fluid flow, the prediction model for the special distribution of the composition, amount, and size of inclusions in liquid steel of metallurgical reactors and in the steel of final continuous casting slabs will be established. The prediction model will be used in steel industries to efficiently predict the transient evolution of inclusions and to improve the removal of inclusions and the correct distribution of inclusions in final steel products by optimizing parameters for the refining and continuous casting of the steel. The application of the developed model can provide theoretical fundamentals for the intelligent control of non-metallic inclusions during refining and continuous casting of steels.

本研究拟通过实验室实验、热力学计算、动力学计算、数学模拟和工业试验的方法，补充和完善热力学参数，建立一个完整的、更加准确的多合金脱氧热力学数据库；确定“精炼渣-钢液-夹杂物-耐火材料-合金-空气”多元反应动力学机理，明确钢成分、精炼渣成分、非金属夹杂物成分随时间变化的动力学以及夹杂物的形核、长大和去除机理；揭示钢液凝固和连铸坯冷却过程中夹杂物成分和尺寸随温度的变化；与冶金反应器内宏观三维流动、传热和凝固现象相耦合，建立精炼和连铸过程中钢中非金属夹杂物的数量、成分、尺寸在冶金反应器内和连铸坯内最终的三维空间分布的预测模型；把模型应用于钢铁企业的实际生产，预测钢精炼和连铸过程中钢中非金属夹杂物的瞬态变化行为。最终通过该模型来优化钢液精炼参数和连铸参数，促进夹杂物的去除，改善夹杂物数量、成分、尺寸在钢产品中的空间分布，为钢的精炼和连铸过程中夹杂物的智能控制提供理论基础。

本研究通过实验室实验、热力学计算、动力学计算、数学模拟和工业试验的方法，补充和完善热力学参数；确定“精炼渣-钢液-夹杂物-耐火材料-合金-空气”多元反应动力学机理，明确钢成分、精炼渣成分、非金属夹杂物成分随时间变化的动力学以及夹杂物的形核、长大和去除机理；揭示钢液凝固和连铸坯冷却过程中夹杂物成分和尺寸随温度的变化；与冶金反应器内宏观三维流动、传热和凝固现象相耦合，建立精炼和连铸过程中钢中非金属夹杂物的数量、成分、尺寸在冶金反应器内和连铸坯内最终的三维空间分布的预测模型；把模型应用于钢铁企业 的实际生产，预测钢精炼和连铸过程中钢中非金属夹杂物的瞬态变化行为。最终通过该模型来优化钢液精炼参数和连铸参数，促进夹杂物的去除，改善夹杂物数量、成分、尺寸在钢产品中的空间分布，为钢的精炼和连铸过程中夹杂物的智能控制提供理论基础。出版专著6本，发表SCI/EI论文96篇，中文高水平论文27篇、授权专利10项、获省部级科技进步一等奖4项。