Study On Flow Field Of Three-product Cyclone Classification Screen With Inclined Screen

As a new type of high-efficiency fine-grain coal grading equipment,it has achieved good application results in industry,so three-product cyclone classification screen has high research value and broad application prospects.This article takes this device as the research object,with the method of CFD numerical simulation,exploring the influence of inclined screen on the internal flow field of the equipment.In this paper,firstly based on the structural characteristics and working principle of the equipment,theoretical analysis of the research object,to provides a basis for the setting of conditions and the selection of models in FLUENT simulation.The equipment flow field model was established by the software of Solidworks,the grid processing was performed by ICEM-CFD software,and the internal flow field information of the equipment was obtained by FLUENT software.By comparing the internal flow field difference of two equipments which screen has 10? inclination and screen has 0?inclination.We can find out that when the screen has a inclination the path radius of maximum tangential velocity of this equipment will decrease,the tangential velocity and centrifugal strength will decrease at the same position,the amplitude of tangential velocity decreases as the axial height decreases will increase.The axial velocity of the outer spiral will increases,and the area of the zero-speed envelope surface and the separation particle size will decreases.From the point of view of pressure,when the screen has inclination,the amplitude of total pressure and static pressure increase with increasing radius will decreases,there will be a zero pressure point,thus creating a “Backflow” phenomenon at the bottom of the screen,the effective screen area of screen will decreases.By changing the height of the inclined screen the position of screen-below outlet and the size of the inlet flow,exploring the influence of main parameters on the flow field of equipment,We can find out that reducing the height of the screen can effectively control the emergence of “Backflow”,the screen height of 109 mm is the critical screen height that “Backflow” appears,from the perspective of the influence of “Backflow” on the equipment,the optimum value of the screen height should be about 109 mm,the smaller the height of the screen,the greater the tangential velocity in this equipment.When the screen-below outlet is located at the end of the screen,the equipment has a greater tangential speed,and "Backflow" will appear later.With the increase of inlet flow,the pressure of the zero-pressure point will increase,but the position of the the zero-pressure point will not change.By changing the inlet flow,the “Backflow” phenomenon can not be improved,each outlet flow increases with the increase of the inlet flow rate,and all meet the linear relationship.In this paper,through the simulation study on the Three-product cyclone classification screen with inclined screen provides a new idea of structural optimization and lays a good theoretical foundation for the application of this equipment in production practice.This paper has 44 figures,5 tables,77 references.