Abstract:

In order to give consideration to both the high separation accuracy and large processing capacity, the parallel configuration of mini-cyclones is being used more and more. The influences of the spiral channel on the separation performance of the gas cyclones were investigated and the classification capacity and influences on particle distribution of the spiral channel were analyzed by discrete phase model (DPM) and classification experiments. The results showed that the large particles were inclined to discharge from the former outlets of the spiral channel and then enter the cyclones successively. The discharged particles presented different size distributions in every outlets, which contribute to the classification. The spiral channel made influences on the fine particles to force them enter the cyclone with a state that the finer particles are close to the outside wall, and the concentration of internal section is higher than that of the external one. The particle rings formed by the large particles promoted the separation of fine particles, thereby increasing the separation efficiency of the cyclone. The experiment further verified the classification capacity and influences on particle distribution of spiral channel. The results could provide directive significance to the parallel configuration of mini-cyclones.

Key words: cyclone, separation, spiral channel, numerical simulation, size distribution

摘要：

为兼顾高分离精度及大处理量的要求，微小型旋风分离器并联得到越来越多应用。运用离散相模型和实验研究了螺旋并联分配管对旋风分离器分离性能的影响，分析了螺旋分配管分级和改变“序态”特性。结果表明，大颗粒易于从分配管前端出口逸出，依次进入旋风分离器固体颗粒呈现不同粒径分布，总体呈现分级特性；螺旋管对细颗粒物具有改变“序态”作用，进入旋风分离器颗粒粒径呈现外小内大趋势，内部相比外部颗粒浓度更高；内侧大颗粒构成的粒子环促进细小颗粒的去除，从而提高旋风分离器分离效率。实验进一步验证螺旋分配管分级和改变“序态”特性。研究结果对微小型旋风分离器并联设计具有指导意义。

关键词: 旋风分离器, 分离, 螺旋分配管, 数值模拟, 粒度分布