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为了综合分析还原罐内传热过程及化学反应过程对Pidgeon炼镁工艺中产镁速率和反应转换率的影响机理,建立了具有耦合特征的传热和反应动力学模型。利用该模型对炼镁过程进行了数值模拟,获得了还原罐内的温度和产镁速率的空间分布和时间分布,并分析了罐外等效换热系数对上述结果的影响。结果表明:罐中心区域与罐壁处的温度及反应速率存在较大差值;球团的吸热反应特性及导热热阻是影响产镁速率和反应转换率的主要原因,而等效换热系数在达到一定数值后,对罐内的工作过程影响不大。
In order to comprehensively analyze the influence mechanism of heat transfer process and chemical reaction in reduction tank on magnesium production rate and reaction conversion rate in Pidgeon magnesium refining process, a heat transfer and reaction kinetic model with coupling characteristics was established. The model was used to simulate the process of magnesium refining. The spatial distribution and time distribution of temperature and magnesium production rate in the reduction tank were obtained. The effect of the equivalent heat transfer coefficient outside the tank on the above results was also analyzed. The results show that there is a big difference between the temperature and the reaction rate at the center of the tank and the tank wall. The endothermic reaction characteristics of the pellets and the thermal conductivity of the pellets are the main factors that affect the rate of magnesium production and the reaction conversion rate. However, After the coefficient reaches a certain value, it has little effect on the working process in the tank.