【摘要】 水力学模型和 90tRH精炼装置原型的线性比例为 1∶5。模型吹气孔直径分别为 0 8mm和 1 2mm。试验结果表明 ,在给定的吹气量Qg、上升和下降插入管直径Du 和Dd 下 ,吹气孔直径din 的增大并不显著改变RH精炼过程中钢液流动特征 ,但是环流量Ql 随吹气孔直径din 的增大而增大 ,其关系式为 :Ql=2 4 0Q0 2 3g D0 .72u D0 .88d d0 .1 3in ;0 8mm和 1 2mm孔径下的混合时间τm 与搅拌能密度ε的关系分别为τm ∝ε0 .5和τm ∝ε0 .4 9。更多还原

【Abstract】 The linear-scale-ratio of the water model to a 90 t RH refining unit was 1/5 and the inner diameters of gas port used were 0.8 mm and 1.2 mm, respectively. The experimental results showed that at given lifting gas flow rate Q g and inner diameters of up-snorkel D u and down-snorkel D d, the flow pattern of molten steel during RH refining was not changing obviously with increasing of gas port inner diameter d in, but the circulation flow rate Q l increases with increasing of d in according to the relation Q l = 2.40 Q 0.23 gD 0.72 uD 0.88 dd 0.13 in; and the relation between mixing time τ m and stirring energy density ε is τ m ε 0.50 for d in 0.8 mm and τ m ε 0.49 for d in 1.2 mm.更多还原