流化床还原铁精矿粉动力学初算

Primary Study on Kinetics of Fine Iron Ore Reduction in a Fluidized Bed

采用鼓泡床模型对流化床还原铁(精)矿粉动力学进行了初步的研究、计算和讨论.结果表明,流化床内的气泡直径随密相床层高度的增加而增加,气泡-气泡晕交换系数(K_(bc))_b及气泡晕-密相交换系数(K_(ce))_b则随密相床层高度的增加而降低;(K_(bc))_b>(K_(ce))_b;小粒度颗粒的还原速度随密相床层高度的增加变化不大,大粒度颗粒还原到一定程度后还原速度会降低,而且明显慢于小粒度颗粒的还原速度.

Kinetics of iron ore frees reduction in a fluidized bed was primarily studied and discussed by using Kunii-Leveuspiel model. The results showed that the diameters of bubbles in the fluidized bed became more larger with the increment of dense bed height,while (K_(bc))_b and(K_(ce))_b decreased.(K_(bc))_b Was bigger than(K_(ce))_b.Reduction speed of small granularities varied little in the direction of dense bed height,and speed of larger one reduced when a special reduction degree was reached,and its speed w...