Geldart's A,B和D类粒子振动流化床空气动力学的研究

AERODYNAMICS CHARACTERISTICS IN A VIBRATED FLUIDIZED BED CONTAINING GERDARTs A, B OR D MATERIALS

主要研究Φ１４８ｍｍ的振动圆柱形流化床的空气动力学，研究了振动强度为１～５ｇ，静止床层高度为１００ｍｍ～２００ｍｍ和属于Ｇｅｌｄａｒｔ＇ｓＡ，Ｂ和Ｄ物料等条件下床层压降、最小流化气速和床层空隙率变化，考察振动条件下振动参数、颗粒物性和静止床层高度等操作参数对空气动力学的影响，得出固定床段的床层压降的升高和最小流化速度的降低是由于床层空隙率的降低所造成的，并由实验结果关联出床层压降和最小流化气速计算式。同时根据振动流化床的能量关系，得出振动流化床在振动强度为０．６～３．０时是最节省能量的操作范围。

Results of an experimental study on the aerodynamics in a vertically vibrated fluidized bed of diameter 148 mm were presented and discussed Variables studied included frequency (0￣219 s 1 ), amplitude (0￣1 01 mm), bed height (100￣200 mm) and different particles belonging to Geldarts A,B and D groups The effects of vibration parameters and properties of particle, as well as bed height on aerodynamics were discussed On the basis of experimental results, empirical correlation was proposed for (P mf ) v and (u mf ) v, which were both found to decrease significantly with the increase of vibration acceleration According to energy consumption of vibrated fluidized bed, the optimum rang of vibration intensity between 0 6 and 3 was also obtained