230mm板坯连铸结晶器浸入式水口结构的优化  

Optimization of Structure of Submerged Nozzle for 230 mm Slab Casting Mold

作　　者：时朋召 邱春根 徐李军[2] 仇圣桃[2] 潘贻芳[4] 赖朝彬[1] 

机构地区：[1]江西理工大学冶金与化学工程学院,赣州341000 [2]钢铁研究总院连铸技术国家工程研究中心,北京100081 [3]江西理工大学材料科学与工程学院,赣州341000 [4]天津钢铁集团有限公司,300399

出　　处：《特殊钢》2017年第1期4-8,共5页Special Steel

摘　　要：采用几何相似比1:2水模型研究了230 mm×1 250 mm板坯结晶器原浸入式水口(下孔直径78 mm,侧孔长轴80 mm,短轴66 mm)和缩小孔面积的优化水口(下孔直径65 mm,侧孔长轴75 mm,短轴60 mm)结晶器液面波动、冲击深度,流场分布和保护渣覆盖情况。结果表明,同种工况下,优化水口下液面波动更活跃,液渣层相对均匀,即减小水口侧孔面积,能提高流股出口速度,有利于保护渣熔化;钢厂生产DP600钢230 mm×1 250 mm铸坯测定结晶器内液渣层的厚度表明,当水口浸入深度130 mm,通钢量2.8 t/min时,使用原有水口时液面不太活跃,液渣层厚度差为12~13 mm,使用优化水口时,液面较活跃,液渣层厚度差为3~5 mm。The mold liquid surface fluctuation, impact depth, distribution of flow field and powder covering condition with using original submerged nozzle （ lower hole diameter 78 ram, side hole long axis 80 mm and short axis 66 mm） and with using optimized submerged nozzle of reduced hole dimension （ lower hole diameter 65 mm, side hole long axis 75 mm and short axis 60 mm） for mold of 230 mm × 1 250 mm casting slab have been studied by using geometric similarity 1：2 water model. Results show that in same working procedure condition with using optimized submerged nozzle the liquid surface fluctuation is more active, the thickness liquid slag layer is relative uniform, i.e. reducing side hole area of nozzle is available to increase the velocity of flow at outlet and favorable to melt the mold powder. By measured the thickness of liquid slag layer in mold for casting 230 mm×1 250 mm slab of steel DP600 at steelworks the results show that with nozzle submerged depth 130 mm and steel flow rate 2. 8 t/min, by using the original nozzle the liquid surface in mold is less active and the difference of thickness of liquid slag layer in mold is 12 - 13 mm, but the liquid surface in mold is rather active and the difference of thickness of liquid slag layer is 3 - 5 mm by using optimized nozzle. Material Index 230 mm × 1 250 mm Slab Casting, Mold, Water Model, Optimization of Submerged Nozzle Structure, Mold Powder Melting

关 键 词：230 mm×1 250 mm连铸板坯 结晶器 水模型 浸入式水口结构优化 保护渣熔化 

分 类 号：TF341.6[冶金工程—冶金机械及自动化]