富氧方式对高炉风口回旋区状态的影响研究  

Study on the effects of oxygen enrichment modes on the tuyere raceway states of blast furnace

作　　者：郑魁 赵鹏[2] 胡鹏 黄云 张建良[2] 徐润生[2] Zheng Kui;Zhao Peng;Hu Peng;Huang Yun;Zhang Jianliang;Xu Runsheng(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Xichang Steel and Vanadium Co.,Ltd.,Pangang Group,Xichang 610053,Sichuan,China)

机构地区：[1]钒铁资源综合利用国家重点实验室,四川攀枝花617000 [2]北京科技大学,绿色低碳钢铁冶金全国重点实验室,北京100083 [3]攀钢集团西昌钢钒有限公司,四川西昌610053

出　　处：《钢铁钒钛》2024年第6期108-118,共11页Iron Steel Vanadium Titanium

基　　金：安徽省重点研究与开发计划(202210700037);五矿集团科技专项(2021ZXD01)。

摘　　要：依据国内某企业冶炼钒钛磁铁矿高炉的实际尺寸建立了三维物理模型,利用数值模拟的方法对比研究了不同富氧方式下煤粉在风口回旋区内的流动、燃烧行为。结果表明,减风富氧与定风富氧方式工况下,风口气流速度变化随富氧率变化的整体趋势一致,但变化幅度差距显著,即富氧率增加1%,风口截面速度分别增加4.25 m/s(定风)和0.41 m/s(减风)。两种富氧方式下,回旋区内的温度、还原气体含量及煤粉燃尽率与富氧率的变化趋势一样,即富氧率增加,温度增加,高温区域扩大,还原气体含量增加,煤粉的燃尽率上升。其中,减风富氧时由于热风流量减小,带入高炉的N_(2)量减少,煤气中CO和H_(2)的含量变化较大,对高炉减少氮化碳和碳化钛生成、改善铁矿还原效果具有较好的帮助,建议高炉提高富氧率采用减风富氧模式。经计算,富氧率每增加1%,回旋区平均温度增加34.22 K(定风)和32.88 K(减风);减风富氧条件下,富氧率每增加1%,热风带入高炉的N_(2)量减少10 m^(3)/min,煤气中的CO质量浓度上升8.61%。In this paper,based on the actual dimension of the vanadium titanomagnetite blast furnace of a domestic enterprise,a three-dimensional physical model is established.The numerical simulation method is used to compare and study the flow and combustion behavior of pulverized coal in the tuyere gyration area under different oxygen enrichment methods.The results show that the overall trend of the tuyere velocity change with the oxygen enrichment rates is consistent with that of the constant air enrichment mode,but the difference in the change amplitude is significant.That is,when the oxygen enrichment rate is increased by 1%,the cross-sectional velocity of the tuyere is increased by 4.25 m/s(fixed air)and 0.41 m/s(reduced air),respectively.Under the two oxygen enrichment modes,the temperature,reducing gas content and burnout rate of the pulverized coal in the gyratory area have the same trend with the oxygen enrichment rates.As temperature increases,the high temperature area expands with the increase in the reducing gas content,and the burnout rate of pulverized coal increases.Among them,the amount of N_(2) brought into the blast furnace decreases due to the decrease in hot air flow rate,and the content of CO and H_(2) in the coal gas changes greatly,preventing the formation of carbon nitrides and titanium carbides,and improving the reduction effect of iron ore in the blast furnace.It is calculated that the average temperature of the gyratory zone is increased by 34.22 K(fixed air)and 32.88 K(reduced air)for every 1%increase in the oxygen enrichment rate.Under the condition of reduced air and oxygen enrichment,the N_(2) content brought into the blast furnace is reduced by 10 m^(3)/min and the CO concentration in the gas is increased by 8.61%.

关 键 词：高炉 富氧方式 回旋区状态 CFD数值仿真 

分 类 号：TF538.5[冶金工程—钢铁冶金]