摘要
通过还原实验并结合热力学和动力学分析,研究了高炉富氧喷煤条件下炉缸煤气(H_2-CO-N_2)中H_2体积分数变化时烧结矿的富氢还原行为.结果表明,还原气体中H_2含量为10%时,700,900和1000℃下烧结矿的还原度分别比H_2含量为0时提高15.3%,11.5%和11.4%;温度越高还原速率越快,还原结束时间大幅度提前,由700℃时的180min缩短到1 000℃时的90 min;H_2含量为10%时Fe_2O_3和FeO转变速度加快.动力学分析表明,还原初期为界面反应控制,中后期为内扩散和界面化学反应混合控制.
Experimental research, thermodynamic and kinetic analysis were used to investigate the effect of H2 content in（H2-CO-N2） gas on H2-rich reduction behavior of iron ore sinter under the conditions of high pulverized coal injection rate and oxygen enrichment. The results showed that with H2 content in reducing gas increased from 0 to 10%, the reduction degree of sinter was increased by 15.3%, 11.5% and 11.4% at 700, 900 and 1 000 ℃, respectively, the reduction rate not only increased, but also the ending time was greatly shortened with the increase of temperature. The transformation speed of Fe2O3 and Fe O was faster when the content of H2 was 10% during the reduction process of sinter. The reduction of iron ore sinter was controlled by interfacial chemical reaction in the initial stage, and both interfacial chemical reaction and inner diffusion in the final stage.
出处
《过程工程学报》
CAS
CSCD
北大核心
2015年第6期1024-1028,共5页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:51474164)
湖北省自然科学基金指导性计划资助项目(编号:2015CFC838)
关键词
烧结矿
富氢还原
热力学
动力学
sinter
hydrogen-enriched reduction
thermodynamics
kinetics
