Abstract: 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 1000℃, 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 FeO 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.

Key words: sinter, hydrogen-enriched reduction, thermodynamics, kinetics

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(H2-CO-N2)中H2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H2含量为10%时，700, 900和1000℃下烧结矿的还原度分别比H2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180 min缩短到1000℃时的90 min；H2含量为10%时Fe2O3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.

关键词: 烧结矿, 富氢还原, 热力学, 动力学