冶炼钒钛矿高炉富氢非等温还原行为及合适富氢率的探讨  

Non-isothermal reduction behavior and appropriate hydrogen enrichment rate of blast furnace with vanadium titanium ore

作　　者：郄亚娜 王新东 李宇壮 王艺帆 张淑会 陈树军 QIE Yana;WANG Xindong;LI Yuzhuang;WANG Yifan;ZHANG Shuhui;CHEN Shujun(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063009,Hebei,China;HBIS Co.,Ltd.,Shijiazhuang 050000,Hebei,China;Chengde Branch,HBIS Co.,Ltd.,Chengde 067002,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063009 [2]河钢集团有限公司,河北石家庄050000 [3]河钢股份有限公司承德分公司,河北承德067002

出　　处：《钢铁》2023年第8期61-68,81,共9页Iron and Steel

基　　金：国家自然科学基金资助项目(52104328);河北省重点研发计划资助项目(22374003D);河北省自然科学基金资助项目(E2021209023)。

摘　　要：高炉富氢是降低高炉能耗与碳排放重要途径,为确定高炉合适富氢率,研究了不同富氢率条件下钒钛矿的软熔滴落过程,并采用历程中断法分析了钒钛烧结矿、球团矿的非等温还原行为。研究结果表明,高炉富氢改善了钒钛矿还原条件,随煤气富氢率的增加,钒钛烧结矿、球团矿的还原度升高,尤其是高温条件下,煤气富氢率对还原的影响更为明显,初渣中FeO含量减少,初渣渣量降低,冶炼钒钛矿高炉富氢后软熔带位置下移,厚度减薄,尤其是透气性最差的熔融区间变窄,透气性增加;由于物理形貌和结构特征的不同,钒钛烧结矿与球团矿的还原速率随富氢率的增加表现出不同的变化趋势,富氢后钒钛烧结矿的还原速率在900~1 000℃达到最大值,而钒钛球团矿的还原速率随温度的增加呈增加趋势。高炉富氢恶化了钒钛矿非等温还原过程的粉化指标,适当减小炉身角可缓解富氢高炉块状带钒钛矿还原粉化现象。当煤气中富氢率以5%幅度增加时对钒钛矿非等温还原和软熔滴落性能的影响是不同的,富氢率由0增加到5%时的影响最大,其次是由5%增加到10%,富氢率超过10%时对钒钛烧矿的还原及软熔滴落行为影响较小,综合考虑还原气体富氢率对钒钛矿非温度还原、软熔滴落性能和软熔带分布的影响,冶炼钒钛矿高炉的富氢率应为10%左右。Hydrogen-rich metallurgy in blast furnace(BF)is an important way to reduce energy consumption and carbon emission.In order to determine the proper hydrogen enrichment rate of blast furnace,the influence of hydrogen enrichment rate on the process of softening and melting of vanadium titanium ore was studied,and the non-isothermal reduction behaviors of sinter and pellets with vanadium-titanium are analyzed by the process interruption method.The results showed that,the hydrogen-rich metallurgy in BF improves the reduction condition of vanadium titanium ore.With the increase of hydrogen enrichment rate,the reduction degrees of sinter and pellets with vanadium titanium increase,especially under the condition of high temperature,the effect of hydrogen enrichment rate of gas is more obvious.The FeO content and the amount of primary melting slag decrease with hydrogen enrichment in BF.The hydrogen-rich operation of BF with vanadium titanite ore will make the cohesive zone move down and the thickness thin,especially the melting zone with the worst permeability become narrowed,and the permeability of burden increases.Due to the different physical morphology and structural characteristics,the reduction rates of sinter and pellets with vanadium-titanium show different trends with the increase of hydrogen enrichment rate.After hydrogen enrichment,the reduction rate of sinter with vanadium-titanium reaches the maximum value at 900-1000℃,while the reduction rate of pellets increases with the increase of temperature.The hydrogen-rich operation of BF worsens the pulverization index of vanadium titanite in non-isothermal reduction process,so properly decreasing the furnace body Angle can alleviate the pulverization of vanadium titanium ore in BF lumpy zone with hydrogen enrichment.When the hydrogen enrichment rate in gas increases by 5%,the influence on the non-isothermal reduction and soft-melting dripping of vanadium titanium ore is different.The effect is the greatest when the hydrogen enrichment rate increases from 0to 5%,f

关 键 词：高炉富氢 非等温还原 软熔滴落 还原粉化 钒钛矿 

分 类 号：TF54[冶金工程—钢铁冶金]