上升气泡对钢渣界面行为的影响  

Influence of a rising bubble on behavior of steel-slag interface

作　　者：刘勇[1] 程树森[1] 刘童 LIU Yong;CHENG Shusen;LIU Tong(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁》2024年第2期75-84,共10页Iron and Steel

基　　金：国家自然科学基金资助项目(62071034)。

摘　　要：钢水与炉渣之间的界面接触面积是影响化学反应效率的关键因素之一。通过搭建水-油体系物理模型,结合图像处理技术,重现气泡穿越渣-金界面现象,研究气泡大小、渣层密度、黏度及界面张力对气泡携带金属量及渣-金界面面积的影响。结果发现,气泡尺寸增加,气泡夹带金属液滴体积及体积增长速率均增大,气泡初始直径从5 mm增大到15 mm及25 mm时,夹带量分别增加733.33%及3611.11%。随着炉渣黏度增加和密度减少,夹带量增加,但在所研究的炉渣厚度范围内对其影响程度低。气泡穿越过程引起渣-金界面面积的变化是关注的重点。值得注意的是,渣-金界面面积随气泡尺寸增加呈先增加后减少的趋势,气泡直径从5 mm增大到15 mm及25 mm时,界面面积分别增加312.97%及113.44%。当气泡尺寸为15 mm时,油相密度由0.76 kg/m^(3)增加到0.84 kg/m^(3),界面面积增长率增加67.44%;黏度由8.9 mPa·s增加到193.5 mPa·s,界面面积增长率减少31.39%。另外,通过数值模拟表明油表面张力、水表面张力或者水-油界面张力由0.03 N/m增加至0.06 N/m,液-液界面面积最大值分别增加2.96%、减少6.05%及减少9.14%,影响程度从高到低分别为,油-空气、水-空气及水-油界面张力。结合钢液二次精炼,选择合适的底吹气量和炉渣物性参数对精炼效率有重要作用,但由于试验材料物性参数的限制,未来建议通过数值模拟的手段,进行单参数对夹带量与渣-金界面面积的影响程度分析,提供更有效的现场指导。The interfacial contact area between molten steel and slag is one of the key factors influencing the efficiency of chemical reactions.The phenomenon of gas bubbles traversing the steel-slag interface by constructing a physical model of the water-oil system and employing image processing techniques isreconstructed.The study focuses on the effects of bubble size,slag layer density,viscosity,and interfacial tension on the entrainment volume of steel and the area of the steel-slag interface.The results show that as the bubble size increases,both the entrainment volume of steel and their growth rate also increase.When the initial diameter of the bubble increases from 5 mm to 15 mm and 25 mm,the entrainment volume increases by 733.33%and 3611.11%,respectively.As the viscosity of the slag increases and its density decreases,the entrainment volume of steel increases.However,the thickness of the slag layer has a low impact on this phenomenon.The variation in the area of the steel-slag interface caused by the process of bubble traversal is a key focus of attention.It is worth noting that the area of the steel-slag interface exhibits a trend of increasing and then decreasing as the bubble size increases.When the bubble diameter increases from 5 mm to 15 mm and 25 mm,the interface area increases by 312.97%and 113.44%,respectively.When the bubble size is 15 mm,an increase in the density of the oil phase from 0.76 kg/m^(3)to 0.84 kg/m^(3)results in a 67.44%increase in the growth rate of the interface area.However,when the viscosity increases from 8.9 mPa·s to 193.5 mPa·s,the growth rate of the interface area decreases by 31.39%.Furthermore,the maximum value of the liquid-liquid interface area grows by 2.96%,falls by 6.05%,and lowers by 9.14%,respectively,when the surface tension of the oil phase,water phase,or water-oil interface increases from 0.03 N/m to 0.06 N/m.Oil-air,water-air,and water-oil interface tension are the order of influence,going from high to low.Combined with secondary refining,the selection of flow rate an

关 键 词：物理模型 数值模拟 渣-金界面 上升气泡 夹带体积 界面面积 

分 类 号：TF703[冶金工程—钢铁冶金]