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本文研究了用纯H_2及H_2和CO各50％的还原气还原某公司日产10吨和100吨回转窑焙球的速率。测定了温度、粒度、气孔率及氢含量等因素对焙球还原速率的影响,提出了改善焙球还原速率的措施。根据收缩未反应核模型和颗粒模型的有关假定,推导出描述焙球还原过程的数学式,此种数学式适宜于用计算机处理,以便计算出动力学参数。但按此数学式用计算机处理实验数据表明,上述两模型尚不能真实反映本焙球还原过程。
In this paper, the reduction rate of a company Nissan 10t and 100t rotary kiln baking balls with 50% reduction of pure H 2, H 2 and CO by reducing gas was studied. The influence of temperature, particle size, porosity and hydrogen content on the reduction rate of the baking balls was measured. The measures to improve the reduction rate of the baking balls were put forward. Based on the assumptions of the contraction of the unreacted core model and the particle model, a mathematical formula describing the process of reduction of the baking sphere is deduced, which is suitable for computer processing in order to calculate the kinetic parameters. However, according to this mathematical formula, computer processing of experimental data shows that the above two models can not truly reflect the reduction process of this baked ball.