Study On The Structure And Performance Of A Novel Combined Micro-cyclone Separator

The micro-cyclone can efficiently separate fine particles and can be used in parallel to meet the needs of different processing capabilities in industrial processes.In this paper,the characteristics of gas phase flow field,particle trajectory,separation efficiency and so on in the combined micro-cyclone separator were systematically studied by means of experimental research and numerical simulation,which provided theoretical basis for the optimal design of micro-parallel cyclone separator.The separation performance of the separator was studied by building an experimental micro-cyclone separator platform.The results show that the pressure drop of the combined micro-cyclone separator increases with the increase of the inlet gas velocity,while the central symmetric parallel combination does not aggravate the power loss.The separation efficiency of the combined micro-cyclone separator increases with the increase of inlet gas velocity and inlet particle concentration of the micro-cyclone element,and remains stable after reaching the critical value.When the inlet gas velocity of the micro-cyclone element is small,the effect of particle concentration on the separation efficiency is more significantly.The combined micro-cyclone separator can remove fine particles below 5 ?m efficiently when the micro-cyclone element inlet gas velocity vin?8.29 m·s-1.The combined micro-cyclone separator has better separation efficiency than the single micro-cyclone separator.The numerical simulation of the gas phase flow field in the combined micro-cyclone separator was carried out by using Fluent software.The results show that the distribution of tangential velocity in the micro-cyclone element exhibits the characteristics of combined vortex,which has a significant effect on separation efficiency and pressure drop.The axial velocity is almost axisymmetric in its cylinder and cone,and its distribution is a shape of inverted V.In the quasi-free vortex region,the raxial velocity is small and the distribution is uniform.The raxial velocity in the forced vortex region is large and positive,which shows a"wavy" distribution.The influence of the structural parameters of the combined micro-cyclone separator and its internal particle motion characteristics on the separation efficiency was investigated by Fluent software.The results show that the classification efficiency of liquid particles and solid particles decreases with the increase of the inlet diameter of the micro-cyclone.When the particle size is larger than 3 ?m,the classification efficiency is close to 1.The separation performance of the combined micro-cyclone is higher than that of the single micro-cyclone element,and the classification efficiency decreases as the number of micro-cyclones increases.When the inlet of the micro-cyclone element is blocked,the total separation efficiency of the combined micro-cyclone separator decreases first and then increases with the increase of the total inlet gas velocity.The plugging of the dust exhaust pipe only affects the blocked micro-cyclone element itself,which has less effect on other micro-cyclone components.