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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
In view of the essential difference between the physical and chemical properties of the magnesium powder and the calcium carbide powder, the author focuses on the analysis of the thermodynamics, reaction mechanism and kinetics of magnesium particles in the desulfurization process. Based on the analysis of the influences of three basic parameters such as the mixing time of the molten pool, the penetration ratio of the powder and the dwell time of the powder on the desulfurization process, a model was established to simulate the effect of the three parameters Powder desulfurization mathematical model, and discussed the two powder in the desulfurization process coupling effect. The parameters of this model are confirmed and verified by water model experiment, flow field calculation and Baosteel Iron & Steel Group’s hot metal deep desulfurization production data. The results of the model calculation show that the total desulfurization rate of the composite powder is related to the powdering rate, the carrier gas flow rate, the ratio of magnesium vapor and dissolved magnesium, etc. The desulfurization of magnesium is dominated by dissolved magnesium desulfurization. In different stages of desulfurization, magnesium And calcium carbide relative desulfurization rate is different. And based on this blowing process gives a reasonable suggestion