吹氩结晶器内钢渣界面氩气泡行为研究  

Study on Argon Bubble Behavior at Interface of Steel and Slag in Continuous Slab Casting Mold with Argon Blowing

作　　者：程常桂[1] 张金磊 陈赢[1] 李阳[1] 金焱[1] CHENG Changgui;ZHANG Jinlei;CHEN Ying;LI Yang;JIN Yan(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室

出　　处：《铸造技术》2019年第10期1027-1034,共8页Foundry Technology

基　　金：国家自然科学基金资助项目（51474163;51874215）

摘　　要：吹氩结晶器内钢渣界面氩气泡的行为对液态保护渣的乳化有重要影响,与钢渣界面处气泡大小、数量及上浮速度等因素有关。因此,本文建立了原型与模型相似比为1∶0.6的板坯结晶器水模型,研究了吹氩量、拉速、水口浸入深度和侧孔倾角对结晶器内钢渣界面氩气泡行为的影响。结果表明,增大吹氩量,从水口到结晶器窄面上浮气泡平均尺寸减小趋势愈加明显,水口附近气泡数量增多且上浮速度逐渐增大,结晶器窄面附近气泡数量有所增加,气泡上浮速度逐渐减小;增大拉坯速度,结晶器内气泡尺寸减小,气泡数量增加,水口附近气泡上浮速度呈减小趋势,窄面附近气泡上浮速度则逐渐增大;增大水口浸入深度,气泡平均尺寸呈减小趋势,水口附近气泡上浮速度略有增加,窄面附近气泡上浮速度先增大后减小;增大水口倾角,气泡直径峰值逐渐减小,窄面附近气泡上浮速度先增加后减小。The argon bubble behavior at the interface of steel and slag in continuous slab casting mold with argon blowing had an important effect on the emulsification of the liquid mold powder, which was related to the bubble number, size and floating velocity. As a result, a physical model of the mold with the similarity ratio of 1∶0.6 had been established, and the effects of operation parameters on the argon bubble behavior at the liquid interface of steel and slag had been studied. The results show that the increase trend of the floating bubble size from the nozzle to the mold narrow surface becomes obvious when the flow rate of argon increases, the bubble number and floating speed near nozzle increase, while the bubble number and floating speed decrease near the mold narrow surface. With the increase of the casting speed, the bubble size decreases,the bubble number increases, and the floating speed of bubble near the nozzle trends to decrease, while it increases gradually near the mold narrow surface. As the immersion depth of submerged entry nozzle raises, the average size of argon bubbles decreases, the floating speed of bubbles near nozzle increases slightly, while the floating speed near the mold narrow surface increases first and then decreases. With the increase of the inclination angle of the submerged entry nozzle port, the peak value of bubble size at the steel/slag interface decreases gradually, the floating speed of bubble near the nozzle has no significant change, but the floating speed of bubble near the mold narrow surface increases first and then decreases.

关 键 词：连铸 结晶器 吹氩 钢渣界面 气泡行为 

分 类 号：TF777[冶金工程—钢铁冶金]