渣-金界面气泡夹带行为数值物理模拟  

Physical and Mathematical Simulation on the Bubble Entrainment Behavior at Slag-Metal Interface

作　　者：周小宾 赵占山[2] 汪万行 徐建国 岳强 ZHOU Xiaobin;ZHAO Zhanshan;WANG Wanxing;XU Jianguo;YUE Qiang(School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243032,China;ESP Department,Rizhao Steel Holding Group Co.,Ltd.,Rizhao 276806,China)

机构地区：[1]安徽工业大学冶金工程学院,马鞍山243032 [2]日照钢铁控股集团有限公司ESP制造部,日照276806

出　　处：《金属学报》2023年第11期1523-1532,共10页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目Nos.51704006和51774004。

摘　　要：利用物理模拟和数值模拟研究气泡和熔渣不同物性参数对气泡在渣-金界面夹带量的影响。研究结果表明,影响气泡夹带量和渣-金界面面积的主要因素是气泡直径,其次是渣层密度,渣黏度和界面张力对气泡夹带影响相对较小。气泡初始直径由10 mm增大到16 mm,气泡夹带量增大了7.41倍,渣-金界面面积增量最大值增大3.67倍。渣层密度由2000 kg/m^(3)增大到5000 kg/m^(3),气泡夹带量增大了62.3%,渣-金界面面积最大值增大了13.1%。渣-金界面张力和黏度增大,气泡夹带量和渣-金界面面积均降低。渣-金界面张力从0.65 N/m增大到1.10 N/m,气泡夹带量减小了30.6%,渣-金界面面积最大值减小6.4%。渣层黏度由0.05 Pa·s增大到2.0 Pa·s时,气泡夹带量降低18.4%,渣-金界面面积最大值减小10.2%。The flow and interaction between slag,metals,and bubbles are very complicated phenomena in metallurgical processes,such as desulfurization in hot metal pretreatment,steelmaking process in a converter,and second refining process.The molten steel or hot metal can be entrained into the slag when a bubble or bubbles flow through the slag-metal interface during the metallurgical process.The bubble entrainment behavior can increase the heat and mass transfer and,in turn,increase the chemical reaction efficiency of the slag-metal interface.Investigating the entrainment behavior helps in understanding the interaction between bubbles and liquid phases.The current study focuses on the effects of bubbles and slag properties on the bubble entrainment behaviors at the slag-metal interface.The results show that the bubble size is the most important factor influencing the entrainment,followed by the slag density.The slag viscosity and interfacial tension of the slag-metal interface show a weaker effect on the entrainment.In particular,the entrainment volume of steel and maximum area of the slag-metal interface increase by 7.41 and 3.67 times when the bubble diameter increased from 10 to 16 mm,respectively.When the slag density increases from 2000 to 5000 kg/m^(3),the entrainment volume of steel and maximum area of the slag-metal interface increase by 62.3%and 13.1%,respectively.The increasing in slag viscosity and interfacial tension is less affected by slag entrainment and interface area.The entrainment volume of steel and maximum area of the slag-metal interface are decreased by 30.6%and 6.4%when the interfacial tension of the slag-metal interface increases from 0.65 to 1.10 N/m,respectively.Similarly,when the slag viscosity increases from 0.05 to 2.0 Pa·s,the entrainment volume of steel and maximum area of the slag-metal decrease by 18.4%and 10.2%,respectively.

关 键 词：渣-金界面 气泡夹带 界面张力 数值模拟 物理模拟 

分 类 号：TF7[冶金工程—钢铁冶金]