【作者】 胡汉涛； 魏季和； 黄会发； 杨森龙； 马金昌；

【Author】 Hu Hantao, Wei Jihe~*, Huang huifa, Yang Senlong, Ma Jinchang(Department of Metallic Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)

【机构】 上海大学材料科学与工程学院；

【摘要】 针对90tRH精炼装置,以水力学模拟研究了吹气孔直在对真空循环精炼过程中钢液流动和混合特性的影响。模型和原型的相似比为1:5。模型吹气孔直径分别为0.8mm和1.2mm。结果表明,1.2mm孔径下环流量和主要工艺参数间的关系为Q₁∞Q_g^0.26D_u^0.69D_d^0.80;在给定的吹气量和插入管内径下,增大吹气孔直径并不显著改变精炼过程中钢液流动特征,环流量随吹气孔直径的增大而略有增大.其关系式为Q₁=2.40Q_g^0.23D_u^0.72D_d^0.88d_in^0.13;相应地,混合时间稍有缩短;0.8和1.2mm孔径下,τ_m与搅拌能密度的关系分别为τ_m∞ε^0.5和τ_m∞ε^0.49。更多还原

【Abstract】 The flow and mixing characteristics of molten steel during the vacuum circulation refining were investigated on a 1:5 linear scale water model unit of a 90 t RH degasser, respectively with the diameters of the ports of 1.2 and 0.8 mm. The flow patterns for the two situations were essentially same, there were no obvious changes. The relation of the circulation flow rate with some main process parameters at d_in, = 1.2 mm can be expressed as Q₁ Q_g ^0.26D_u ^0.69D_d ^0.80. The circulation flow rate slightly increases with an increase of the port diameter and the corresponding relation canbe described by Q₁=2.40Q_g^0.23D_u^0.72D_d^0.88d_in^0.13. Relevantly, the mixing time little decreases with an increase of the port diameter. The relations of between mixing time and stirring energy density are _m ε^0.5 and ε^0.49, respectively at d_in = 0.8 mm and d_in=1.2 mm.更多还原