不同挡墙挡坝组合对两流中间包内流场的影响  

Effect of different combinations of weirs and dams on flow field in two strand tundish

作　　者：李娇[1] 李京社[1] 杨树峰[1] 梁新维[2] 张兴利[2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]河北钢铁集团承德钢铁分公司,河北承德067002

出　　处：《炼钢》2011年第1期36-40,共5页Steelmaking

基　　金：中国博士后科学基金资助项目(20080430020)

摘　　要：在相似理论的基础上,通过水力学模拟对两流板坯连铸中间包3种不同挡墙挡坝组合形式下包内流场进行研究。试验结果表明:方案1(挡墙-挡坝-端挡坝方案)挡墙与挡坝间距不合理,端挡坝未起到控流作用致使中间包内流体平均停留时间、峰值时间短,死区比例较大(27.9%);方案2(挡坝-挡墙-端挡坝方案)显著改善了中间包内流场状况,全混流区及活塞流区比例增加,死区减小为21%;方案3(双墙双坝方案)由于增加一组挡墙延长了流体流动的路径,流体在中间包内的停留时间明显增加,死区比例最小(16.7%),同时微观电导率波动值也最小(0.025ms/cm),为3种方案之最优。Based on the similarity theory the llow held m two-strand slab contmuous casting tundish with three different combinations of weirs and dams has been studied by water modelling experiments. The results show that in case 1 the distance between weir and dam （ ＂weir-dam-end dam＂ plan） is undesirable because the end dam can not effec- tively control the flow field in tundish, and consequently the mean residence time and the minimum residence time of the flow in the tundish is short and the volume fraction of dead zone is larger （27.9%） ; in case 2 （＂dam-weir-end dam＂ plan） the flow field conditions are prominently improved since the volume fraction of the full mixing flow zone and plug flow zone is increased and the dead zone decreased to 21%; in case 3 （＂two weir-two dam＂ plan） the residence time of the flow in the tundish is obviously reduced and the dead zone rate is minimum （16.7%） because the route of the flow fluid is extended due to installation of a group of dams and in the meanwhile the fluctuation value of the micro conductance is minimum （0. 025 ms/cm）. The optimal plan is therefore case 3.

关 键 词：中间包 水模拟 挡墙 挡坝 电导率 

分 类 号：TF777.1[冶金工程—钢铁冶金]