连铸结晶器内水口结构对卷渣行为影响的物理模拟  

Physical simulation of influence of mold nozzle structure on mold flux entrapment

作　　者：田贵昌 季晨曦 高荣正 刘中秋 李宝宽 TIAN Guichang;JI Chenxi;GAO Rongzheng;LIU Zhongqiu;LI Baokuan(Manufacturing Department,Shougang Jingtang Iron and Steel United Co.,Ltd,Tangshan 063200,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China)

机构地区：[1]首钢京唐钢铁联合有限责任公司制造部,河北唐山063200 [2]东北大学冶金学院,辽宁沈阳110819 [3]首钢集团有限公司技术研究院,北京100043

出　　处：《炼钢》2021年第6期38-44,58,共8页Steelmaking

摘　　要：基于相似理论建立了一套1∶3的水模型试验系统,研究了吹氩连铸结晶器内不同浸入式水口结构对卷渣行为的影响,同时考察了不同水口结构下液面波动和氩气泡分布的变化规律。结果表明:结晶器内发生的卷渣方式主要有气泡冲击卷渣、剪切卷渣和乳化抽吸卷渣。采用凹底水口时易发生气泡冲击卷渣和乳化抽吸卷渣,采用凸底水口时易发生剪切卷渣和气泡冲击卷渣;采用凹底、矩形、20°倾角水口时卷渣次数最小,为4次/min;凸底水口液面波动更剧烈,矩形水口不利于降低液面波动;20°倾角凸底水口时结晶器宽度1/4位置最大波高能达到2.5 mm;大倾角水口气泡分布更加分散,冲击深度更大,凸底水口氩气泡随钢液运动距离更远。Based on the similarity theory,a1∶3 water model experiment system was established to study the influence of different submerged nozzle(SEN)structures on slag entrapment behavior in a continuous casting mold with argon blowing.The variation of liquid level fluctuation and argon bubble distribution under different nozzle structures were investigated.The results showed that the main ways of slag entrapment in the mold were bubble impacting slag entrapment,shearing slag entrapment and emulsion pumping slag entrapment.When the concave bottom nozzle was used,it was easy to produce bubble impacting slag entrapment and emulsion pumping slag entrapment.When the convex bottom nozzle was used,it was easy to produce shearing slag entrapment and bubble impacting slag entrapment.When the concave bottom,rectangle,20°inclined nozzle was used,the minimum number of slag entrapment was observed,that was 4 times/min.The liquid level fluctuation of convex bottom nozzle was more severe,and the rectangular nozzle was not conducive to reduce the liquid level fluctuation.The maximum wave height could reach 2.5 mm at the quarter position of the width of the mold at the 20°inclination angle convex bottom nozzle.The bubble distribution was more dispersed and the impact depth was greater in the large angle nozzle.The movement distance of argon bubble with liquid steel was longer with convex bottom nozzle.

关 键 词：连铸结晶器 水口结构 液面波动 卷渣行为 水模型试验 

分 类 号：TF777.1[冶金工程—钢铁冶金]