铁水包喷吹镁-碳化钙复合粉剂脱硫的数学模拟

鉴于金属镁粒和碳化钙粉这两种脱硫粉剂的物理和化学性质有着本质的区别 ,作者重点分析研究了镁粒在脱硫过程中的热力学、反应机理和动力学。在具体分析熔池均混时间、粉剂穿透比及粉剂停留时间这 3个基本参数对脱硫过程影响的基础上 ,建立了能体现这 3个参数影响的模拟铁水喷吹镁粒和碳化钙复合粉剂脱硫处理的数学模型 ,并讨论了两种粉剂在脱硫过程中的耦合效果。结合水模实验、流场计算和宝山钢铁集团公司的铁水包喷粉深脱硫生产数据确定了该模型的参数 ,并对其进行了验证。模型计算结果表明 ,复合粉剂脱硫的总速率与喷粉速率、载气流量、镁蒸汽与溶解态镁的比率等有关 ;镁脱硫是以溶解态镁脱硫为主 ;在脱硫处理的不同阶段 ,镁和碳化钙的相对脱硫速率不同。并依此对喷吹工艺给出了合理的建议

Mathematical Simulation of Desulphurization in Hot Metal by Magnesium-Calcium Carbide Co-Injection

Considering the different physical and chemical properties between magnesium granules and calcium carbide powders, the thermodynamics, mechanism and kinetics of desulphurization in hot metal by magnesium injection were mainly discussed. Based on the analysis about the influences of the mixing time, the penetration ratio of injected powder and the residence time of injected powder in the bath on the desulphurization process, a mathematical model which taken these three parameters into account was developed to simulate the desulphurization rate of hot metal by co injection of magnesium CaC 2 mixture, and the coupling effect between magnesium and CaC 2 was discussed. The water model experiment results, the flow field information from the authors and the industrial data from Baoshan Iron and Steel Company were used to determine the model parameters and verify the model, which can make the prediction values from the model agrees well with practical ones. The simulated results showed that the dissolved magnesium plays a main role in desulphurization. The relative desulphurization rates of Mg and CaC 2 are different at different stages of the injection process, whereby an appropriate injection diagram was proposed.