浸入式喷吹铁水包内多相流行为与反应动力学  

Multiphase flow behavior and reaction kinetics in hot metal ladle with submerged injection

作　　者：王鑫 张飞 刘泳 张彩东 田志强 郑淑国 朱苗勇 WANG Xin;ZHANG Fei;LIU Yong;ZHANG Caidong;TIAN Zhiqiang;ZHENG Shuguo;ZHU Miaoyong(HBIS Material Technology Research Institute,Shijiazhuang 050023,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]河钢材料技术研究院,河北石家庄050023 [2]东北大学冶金学院,辽宁沈阳110819

出　　处：《炼钢》2024年第2期23-30,共8页Steelmaking

基　　金：河北省自然科学基金资助项目(E2022318002);国家自然科学基金资助项目(52174310)。

摘　　要：为提高喷吹式铁水预脱硫过程的脱硫效率,以某厂180 t铁水包为基础,建立了铁水包内CFD-DSM(计算流体力学-脱硫反应模型)耦合模型,系统研究了铁水预脱硫过程的气-固-液多相流行为及反应动力学,揭示了溶解镁脱硫、镁气泡脱硫、氧化钙脱硫与渣层脱硫对脱硫反应的贡献,阐明了载气及镁粉流量对脱硫反应的影响规律。结果表明:气泡流股的穿透深度较小,但其并未依附着喷枪壁面上浮。随氧化钙粉剂的连续喷吹,粉剂沿喷枪壁面上浮。脱硫过程中溶解镁脱硫为主要的脱硫机制,其次为镁气泡脱硫、氧化钙脱硫和渣层脱硫。各反应机制的脱硫速率均随时间先增大后减小。载气流量对脱硫反应影响较小,而镁粉流量对脱硫反应影响最大。当初始硫质量分数为470×10^(-6),铁水中硫质量分数脱至100×10^(-6)时,镁粉流量每增加1 kg/min,喷吹时间平均缩短约43 s。To improve the desulfurization efficiency of hot metal pre-desulfurization process with injection method,a CFD-DSM(Computational Fluid Dynamics-Desulfurization Model)coupled model was established based on 180 t hot metal ladle.The gas-solid-liquid multiphase flow behavior and reaction kinetics during hot metal pre-desulfurization process were systematically studied,and the contribution of dissolved magnesium desulfurization,magnesium bubble desulfurization,calcium oxide desulfurization,and slag layer desulfurization to the desulfurization reaction was revealed.The effects of carrier gas and magnesium powder flow rates on the desulfurization reaction were clarified.The results are shown as follows:the bubbly plume has a smaller penetration depth,but it does not float up attached to the wall of lance.With the continuous injection of calcium oxide powder,powder floats along the wall of lance.In the desulfurization process,the desulfurization by dissolved magnesium is the main desulfurization mechanism,followed by magnesium bubble desulfurization,calcium oxide desulfurization and slag layer desulfurization,and the desulfurization rate of each reaction mechanism first increases and then decreases.The carrier gas flow rate has little effect on desulfurization reaction.However,the magnesium powder flow rate has the greatest impact on the desulfurization reaction.For the hot metal with an initial sulfur mass fraction of 470×10^(-6),when the sulfur mass fraction reaches 100×10^(-6),the injection time is shortened by about 43 s for every 1 kg/min increase in magnesium powder flow rate.

关 键 词：铁水包 浸入式喷吹 多相流行为 反应动力学 

分 类 号：TF704.3[冶金工程—钢铁冶金]