吹氩连铸结晶器内渣金界面乳化行为的试验研究  

Experimental study on emulsification behavior of slag-steel interface in argon blowing continuous casting mold

作　　者：熊永涛 姚毓超 刘中秋 谢广烁 李宝宽 XIONG Yongtao;YAO Yuchao;LIU Zhongqiu;XIE Guangshuo;LI Baokuan(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819

出　　处：《炼钢》2022年第6期22-28,共7页Steelmaking

基　　金：国家自然科学基金项目(51974071,52171031)。

摘　　要：降低连铸结晶器渣金界面乳化程度对减少卷渣、提高铸坯质量至关重要。为了揭示乳化行为的形成机理及乳化的流型结构,采用水模型试验研究了吹氩连铸结晶器内渣金界面的乳化行为,分析了结晶器断面尺寸、拉速、吹氩量和水口插入深度对渣层乳化行为的影响。结果发现:渣相中氩气泡及液滴的停留以及渣金界面剧烈波动都会促进乳化现象的产生。乳化完全后会出现光滑分层流、絮状分层流和絮状波动乳化流三种流型结构。通过分析渣层厚度和液面波动,发现减小结晶器断面尺寸、增加拉速、提高吹氩量和降低水口插入深度均会加剧渣金界面的乳化。Reducing the emulsification degree of the slag-steel interface in the continuous casting mold is very important to reduce the slag entrainment and improve the quality of the slab.In order to reveal the formation mechanism of the emulsification behavior and the fluid structure of emulsification,the emulsification behavior of the slag-steel interface in the argon blowing continuous casting mold was studied by water model experiments,the effects of mold section size,casting speed,argon flow rate and nozzle immerge depth on the emulsification behavior of the slag layer were analyzed.The results show that the retention of argon bubbles and droplets in the slag phase and the violent fluctuation of the slag-steel interface can promote the emulsification behavior.After the emulsification is complete,there will be three flow structures of smooth stratified flow,flocculated stratified flow and flocculated wave emulsification flow.By analyzing the thickness of the slag layer and the fluctuation of the liquid level,it is found that reducing the cross-sectional size of the mold,increasing the casting speed,increasing the argon flow rate and reducing the depth of the nozzle will aggravate the emulsification of the slag-steel interface.

关 键 词：连铸结晶器 渣金界面 乳化 流型结构 水模型试验 

分 类 号：TF777.1[冶金工程—钢铁冶金]