Powder transport behavior in RH degasser with powder injection through up snorkel: a transient numerical model  

作　　者：Zhuang Liu Wen-tao Lou Miao-yong Zhu 

机构地区：[1]Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),Northeastern University,Shenyang 110819,Liaoning,China [2]School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2023年第6期1156-1170,共15页

基　　金：supported by the National Natural Science Foundation of China(Grant No.U20A20272);the Fundamental Research Funds for the Central Universities,NEU(No.N2025017).

摘　　要：A transient numerical model was established to predict the dispersion,distribution,and circulation behavior of the powder injected through the up snorkel in a Ruhrstahl–Heraeus(RH)degasser.The effects of the powder diameter,the lifting gas flow rate,and the powder injection rate on the powder transport were investigated.Local powder concentration was measured by a cold model.The results showed that the predicted powder concentration agreed well with the measured.The powder injection process is divided into three periods,named dispersion period,aggregation and circulation period,and dynamically stable period according to the powder transport behavior.The powder diameter has a great effect on the particle dispersion.When the particles size changes from 30 to 500μm,the powder dispersion characteristic index changes from 0.110 to 0.741,and the ladle top zone powder mass ratio changes from 0.118 to 0.685.The powder circulation mass flow rate increases to 101.0 kg min^(-1)(150μm)and then decreases to 46.6 kg min^(-1)(500μm).Powders with a diameter of more than 220μm can change the steel flow mode in the RH degasser.Increasing the lifting gas flow could slightly improve the powder dispersion.Variation in the powder injection rate has almost no effect on the powder dispersion.

关 键 词：RH degasser Powder injection Numerical simulation Eulerian-granular flow Powder transport behavior Optical probe 

分 类 号：TF703[冶金工程—钢铁冶金]