窄进料旋风分离器分级性能的研究

为了探索新型清晰切割分级方法,本文以Stairmand型旋风分离器为对象进行了窄进料分级性能的模拟与实验研究.模拟软件采用FLUENT6.2,气相流场选用后k-εRealizable模型,颗粒相采用随机轨道模型.实验设备直径0.1 m,进口风速10 m/s,颗粒粒径在0.1 μm～36 μm之间.模拟与实验结果表明:与全进料相比,窄进料能够得到更高的分级效率与更好的分级精度,但提高不大.颗粒轨迹模拟结果表明,这种情况是由旋风分离器本身固有的"短路流"与"下灰环"夹带造成.

The study of grading performance of cyclone separator with narrow feeding

In order to develop new-type clear-cut grading method, the grading performance of a stairmand cyclone separator was studied with narrow feeding by simulation and experimentation. The gas flow field and particle track were simulated using FLUENT6. 2 by k-εRealizable model and discrete random walk model respectively. The diameter of equipment is 0. 1 m, and gas velocity of inlet is 10 m/s with the particle size ranging from 0.1 μm to 36 μm. The computational and experimental results illustrated that the collection efficiency and classification precision of narrow feeding is higher than that of the total feeding, but the change is small. It has been shown by particle track simulation results that the upside short circuit flow near vortex finder and the downside dust whirl in dust duct reduce classification precision and collection efficiency.