烧结矿余热回收竖罐内气体流态的实验研究

采用对Ergun型方程无量纲化的方法对气体通过烧结矿床层的流态进行了研究,考察气体表观流速、烧结矿颗粒直径和床层空隙率对床层内气体压力降的影响,进而探讨床层内临界颗粒雷诺数随颗粒直径的变化规律.研究结果表明:当颗粒直径一定时,床层内单位料层高压力降随气体表观流速的增大呈二次方关系增大.当气体表观流速一定时,单位料层高压力降随颗粒直径和空隙率的增大呈指数关系衰减.床层内临界颗粒雷诺数随床层几何因子的增大呈指数关系减小,且临界颗粒雷诺数实验预测公式的平均计算误差在5%以内,显示了良好的预测性能.

Gas Flow Regime in Vertical Tank for Sinter Waste Heat Recovery

The dimensionless method of Ergun’s equation was used to investigate the flow regime of the gas flow through the sinter bed layer. The effects of the gas superficial velocity， sinter particle diameter and the bed layer voidage on the gas pressure drop in the sinter bed layer were studied， and the change law of particle Reynolds number with the changing of particle diameter was also discussed. The results showed that the pressure drop per unit bed layer height in the sinter bed layer increased as a quadratic relationship with the increase of the gas superficial velocity for a given particle diameter. For a given gas superficial velocity， the pressure drop per unit bed layer height decreased as an exponential relationship with the increase of particle diameter and voidage. The critical particle Reynolds number in the sinter bed layer decreased as an exponential relationship with the increase of the bed layer geometrical factor， and the mean calculation deviation of the experimental prediction formula for critical particle Reynolds number was within 5%， showing a good prediction by using the method.