【摘要】 根据气固两相流在预热器输送床换热管冷态模型内的运动规律,设计开发了三种不同结构参数的分散装置。采用光纤浓度探头针PV-4和高速摄影仪,对装有三种散料装置的输送床换热管冷态模型内的物料运动加速段轴向方向的4个截面,进行了物料运动状态和径向浓度分布规律的试验研究,研究发现:在加速段区域,物料同气流间存在较大的相对运动速度,且湍流强度大,空间浓度变化最明显。当物料运动到加速区域上部,浓度分布呈现出径向中心区域低而边壁高的不均匀分布规律,换热管中心区的颗粒浓度分布曲线较平坦,由中心向边壁靠近,物料浓度单调递增,且近壁处分布曲线变陡。三种散料装置均改善了物料在换热管内部的冲料现象,物料空间浓度分布更加均匀,通过综合对比,发现2#散料装置的分散效果最为理想。更多还原

【Abstract】 For dispersing more effectively the solids into the gas stream in the laboratory model of a vertical tubular preheater,three types of distributor devices different in geometry were installed inside the model and its performance were examined based on the gas-solid two-phase flow motion theory in heatexchange transport bed. Powder radial concentration distribution and falling height were measured at 4levels along the axial direction with the superficial gas velocity ranging from 12 to 21 m / s and different solids loading in the accelerate area of the transfer bed. Observations indicated that as the bulk material accelerated downwards in a short distance there was remarkable relative velocity between the gas and solids,meanwhile the solids concentration was more uniform,and here the gas and solids flows were more fluctuate,in comparison with that in the case of without distributor installed. All of the three distributor devices have a ideal effect in dispersing the particle and the concentration distribution is more uniform.According to the results,No. 2 dispersing equipment has the best effect.更多还原