细粒煤在Falcon分选机中的运动特性及其脱硫研究

简述了Falcon离心重力分选机的特点及工作原理,通过细颗粒在Falcon离心重力场中的受力分析和沉降末速的计算,得出了颗粒沉降时间与离心加速度的关系,结果表明：颗粒的离心加速度越大、固体颗粒与介质的密度差越大、颗粒直径越大,则沉降时间越短.通过对转筒内流膜运动特性分析,研究了处于转筒内不同流膜微层中的颗粒切向速度的变化规律,结果表明：流膜内各微层的切向流速沿径向递增.分析对比了Falcon离心分选和浮选分步释放试验脱硫效果,结果表明了细粒煤在离心重力场中的全硫脱除率要比基于颗粒表面性质分选的浮选过程平均高5%左右.

Research on Moving Characteristic and Desulphurization of Fine Coals in the Falcon Centrifugal Separator

The characteristic and separation principle of the Falcon centrifugal gravity separator were introduced. Through analyzing forces exerted on fine particle in the Falcon centrifugal gravity force field and calculating the terminal velocity, the relation between settling time and centrifugal acceleration was obtained. The result indicates that the bigger the centrifugal acceleration is, the bigger the density difference between the coal particle and medium solid is, and the bigger the diameter of coal particle is, the shorter the settling time is. Based on analyzing the moving characteristics of pulp stream inside, the change law of tangent velocity of fine coal particle in different thin layers of pulp stream was discussed, and the result shows that the tangent velocity increased gradually in radial direction. By comparing the desulfurization result of Falcon test with that of timed release test, the result shows that the average desulphurization efficiency using the centrifugal gravity force field separation is higher by about 5% than that using floatation.