150tRH-IJ精炼条件下钢液—颗粒间的传质特性

Characteristics of the Mass Transfer Between Molten Steel and Particles in the 150t RH-IJ Refining

采用线性尺寸为150tRH装置1/4的水模型研究了RH-PB(IJ)过程中钢液和粉剂颗粒间的传质特性,测定了液体侧的传质系数,考察提升气体流量,上升管、下降管内径和颗粒粉剂对传质系数的影响。结果表明,在上升管径和下降管径相同的情况下,增大气体流量可增大钢液与喷吹粉剂颗粒钢液侧的传质系数,但不宜增大到使环流量达到"饱和"。在现有工作条件下,传质系数为3.392×10-5～2.661×10-4m/s。在给定的增大气体流量和下降管径下,钢液与粉剂颗粒间钢液侧的传质系数随上升管径的增大而增加。当气体流量增大和上升管径给定时,钢液与粉剂颗粒间钢液侧的传质系数随下降管径的增大而减小。钢液与粉剂颗粒间钢液侧的传质系数随环流量的增大而增大。其他参数相同时,在现有工作所取范围内,粉剂颗粒的粒径越大,其与钢液间钢液侧的传质系数越大;为增大传质速率,粉剂不宜过细。

The characteristics of the mass transfer between powder particles and molten steel in the Ruhrstahl Heraeus process injection(RH-IJ)refining were simulatively investigated by the use of a 1/4 scale water model of a 150 t Ruhrstahl Heraeus(RH)degasser. The influences of the lifting gas flow rate,the up-snorkel and down-snorkel inner diameters and the size of powder particles on the characteristics of the mass transfer were examined,together with the mass transfer coefficient on the liquid side. The results s...