直接还原竖炉氢气利用率的数值分析及优化  

Numerical analysis and optimization on hydrogen utilization in DR shaft furnace

作　　者：白明华[1] 李路叶 徐宽[1] 韩少峰[1] 吕建超[1] 董京波[1] 

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《燕山大学学报》2016年第6期481-486,共6页Journal of Yanshan University

基　　金：科技型中小企业技术创新基金无偿资助项目(12C26211300726);河北省科技型中小企业技术创新资金项目(12C1303351003)

摘　　要：在氢气直接还原铁竖炉内氢气的利用率较低,故在竖炉上部增加吹氧装置来实现炉内物理能和化学能的最佳利用,提高氢气利用率。通过计算流体力学软件模拟氢气竖炉和吹氧竖炉还原段的温度场、气体分布,计算出炉内能量的消耗。结果表明,在还原段上部7 m处吹氧,每还原出1 t铁的吹氧量为26.78 Nm3,吹氧竖炉与氢气竖炉相比:氢气利用率提高33.43%,氢气用量减少22.08%,炉顶气还原势降低61.84%,能耗减少14.72%,吹氧周围及上部炉料温度有所升高。It is quite low that the hydrogen utilization of 23% in the hydrogen-based DRI shaft furnace. A new process of oxygen blowing into the upper part of the furnace is proposed to make a proper match on physical and chemical energy,and to improve the utilization of hydrogen. A CFD software is adopted to simulate the temperature field and the gas distribution of both hydrogen based shaft furnace and the oxygen blowing furnace. The energy consumption is calculated. The study results show that the hydrogen utilization in the oxygen blowing furnace has been increased by 33. 43% compared with the traditional hydrogen furnace,with the oxygen consumption of 26. 78 Nm^3/t iron at the height of 7m. Meanwhile, the hydrogen consumption has been decreased by 22. 08%,the reduction potential of top gas has been decreased by 61. 84%,and the consumption of energy has been decreased by14. 72%. The temperature around the position of oxygen blowing in the upper part of the furnace has also been improved.

关 键 词：直接还原 氢气 吹氧 温度场 利用率 

分 类 号：TF554[冶金工程—钢铁冶金]