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采用失重法研究了500～600℃条件下,H2还原铁矿微粉的反应过程.针对气体浓度及反应热对铁矿粉还原过程的影响,提出了传热、传质与反应耦合动力学模型,以模拟铁矿微粉气相还原过程.通过数值计算得到矿粉在不同温度下还原率随时间的变化规律,同时模拟了矿粉内温度变化与分布,以及气体浓度在微粒内部的分布与变化.模拟结果表明,矿粉在600℃下完全还原时间仅为20min,气体在15min后全部扩散到粉粒中心.
The weight loss method was used to study the reaction process of H2 reduction fine iron powder at 500-600 ℃ .According to the influence of gas concentration and reaction heat on the reduction process of iron ore powder, a coupling kinetic model of heat transfer, mass transfer and reaction was proposed, To simulate the process of gas phase reduction of iron ore powder.With the numerical calculation, the change law of the reduction rate of slag at different temperatures with time was simulated and the temperature variation and distribution in the ore powder and the distribution and variation of gas concentration inside the particle were simulated. The results showed that the complete reduction time of slag at 600 ℃ was only 20min, and the gas completely diffused to the center of the particles after 15min.