Behavior of liquid passing through deadman:influence of slag/iron ratio and unburned pulverized coal  

作　　者：Lei Zhang Jian-liang Zhang Xiang-yu Hu Zheng-jian Liu Heng-bao Ma Ke-xin Jiao 

机构地区：[1]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Iron and Steel Research International》2021年第9期1095-1104,共10页

基　　金：the National Natural Science Foundation of China(51704019);the Young Elite Scientists Sponsorship Program by CAST(2018QNRC001).

摘　　要：The ability of a blast furnace hearth liquid(iron and slag)passing through deadman characterizes the activity of the blast furnace hearth.To explore the influence of various factors on the static holdup rate of liquid in the process of passing through the deadman,a physical transport model of liquid passing through the deadman was firstly established.Then,a self-designed experimental device was used to simulate the process,and the influences of slag/iron ratios(250–450 kg/t)and unburned coal content(0%–9%)on the static holdup rate were studied.The experimental results indicate that with the slag/iron ratio increasing,the behavior of liquid passing through the coke packed bed gets much more difficult,and the static holdup rate increases.As the content of unburned pulverized coal(UPC)increases,the static holdup rate decreases first and then rises.This is caused by the dual effects of UPC.On the one hand,UPC can promote the carburizing reaction of unsaturated molten iron,thereby improving the fluidity of molten iron and reducing the static holdup rate.On the other hand,when the content of UPC rises to a certain level,it will be regarded as a kind of solid particle which will increase the liquid viscosity,causing an increase in the static holdup rate.Moreover,the liquid and coke will present interfacial chemical reactions when the liquid flows through the coke packed bed.And the Si-containing iron droplets at the slag–coke interface,generated by the reaction of SiO_(2)with C in the coke,can improve the interface wettability by reducing the interface wetting angle and increase the basicity of slag by consuming SiO_(2),thus improving the fluidity of the liquid and reducing the static holdup rate.

关 键 词：Blast furnace HEARTH Liquid holdup Slag/iron ratio Unburned pulverized coal 

分 类 号：TF534[冶金工程—钢铁冶金]