连铸中间包底吹氩物理模拟和工业实践  

Physical Modeling and Industrial Practice of Argon Bottom Bubbling in Tundish

作　　者：陶立群[1] 姜茂发[1] 王德永[1] 薛文辉[2] 姜学锋[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]本溪钢铁集团公司炼钢厂,辽宁本溪117021

出　　处：《钢铁》2006年第5期32-35,共4页Iron and Steel

摘　　要：通过实验室物理模拟和工业应用实践,研究了透气砖底吹氩对本钢中间包内流体流动行为和去除钢中夹杂物行为的影响.物理模拟研究结果表明,底吹氩可以显著改善中间包内钢水的流动特征,延长钢水在中间包内的停留时间,提高中间包内钢水的混合程度,减少死区体积分率;吹气位置越靠近中间包水口侧对流体特征参数的改变效果更佳;吹氩形成的微气泡群可以显著改善中间包内流体的运动轨迹,流体运动的路线更加曲折,并且全程流动靠近液体表面.工业实践表明,底吹氩形成的“气幕挡墙”对夹杂物效果去除效果明显,与不吹氩相比,铸坯中夹杂物指数从7.33～8.98 mg/（10 kg）降低至4.21～4.33 mg/（10 kg）,且大颗粒夹杂物数量明显减少,没有发现尺寸大于30～50μm的夹杂物.By means of physical model and industrial practice, the influence of argon bubbling into tundish via porous plug on the fluid flow and inclusion removal was performed. The physical modeling showed that, argon bubbling can remarkably improve the fluid flow characteristics, increase residence time, and enhance mixture degree of liquid steel, and decrease dead volume. The smaller the distance between the porous plug and outlet, the stronger the influence of argon bubbling on the fluid flow characteristics is. Because, the movement track of liquid steel is improved by the argon bubbling and route of fluid flow is much more flexuous and close to the bath surface. The industrial practice showed that, the ＂gas bubbling curtain＂ formed by argon bubbling is a potential means to enhance inclusion removal. Compared with the slab cast without Ar bubbling, the inclusion index of the slab cast with argon bubbling was decreased from 7.33 8.98 mg/（10 kg） to 4.21-4.33 mg/（10 kg）, especially, the amount of big inclusions was decreased more obviously. In the slab cast with Ar bubbling, no 30-50 μm size inclusions was observed.

关 键 词：中间包 控流装置 吹氩 

分 类 号：TF777[冶金工程—钢铁冶金]