Numerical Simulation And Structure Optimization Of Liquid-Solid Separation For Water-Sand Cyclone

Hydro-cyclone is the use of centrifugal force to achieve separation equipment which has a high separation efficiency,simple structure,large production capacity,etc.and is widely used in petroleum,chemical,mineral processing,environmental protection and other industries.The Hhydro-cyclone structure is simple,but the internal flow field is very complex and has high requirements for the structural parameters and precision.Through the numerical simulation of CFD method,the fundamental law of the internal flow field of the cyclone is studied and the structural parameters of the cyclone are simulated and optimized,which provides data support and theoretical guidance for the research and development of the hydro-cyclone.The experimental test platform of advanced water-sand cyclone is designed and the performance of water-sand cyclone is studied experimentally.(1)By Fluent software,we obtained the distribution of the velocity field and pressure field in the cyclone but also the motion trajectory and separation efficiency of the particles.The pressure distribution has a good symmetry,radial direction from the wall to the center the pressure gradually decreases,in the center,showing a cylindrical negative pressure area.In the cyclone and the internal swirling flow and the inner swirl are obviously distributed,there is a large number of cyclic vortices caused by the circulating flow in the cylindrical and conical regions.The tangential velocity,axial velocity,radial velocity distribution and comparison with the theoretical characteristics are obtained to determine the correctness of the simulation model.(2)The particle size separation efficiency of particles under different diameters was calculated by DPM model.The particle size separation efficiency of the cyclone increases with the increase of the particle diameter.In the case of the inlet flow rate of21.2 hm /3,the particle separation efficiency of50 d is 15 ?m;that of98 d is about50 ?m.When the particle diameter reaches 50 ?m,the separation can be basically achieved.With the increase of inlet flow,the particle size efficiency of the cyclone is increased first and then decreased.When the inlet velocity is 2.5 sm/(flow rate is17.6 hm /3),the cyclone has the highest efficiency,the50 d smallest particle size,andthe separation of the cyclone The best performance.(3)The air column shape,the cone section velocity vector and the total separation efficiency of the cyclone under different flow rates are studied experimentally.The results are in agreement with the numerical simulation results and the correctness of the simulation model has verified again.(4)The parameters of the cyclone have a great influence on the performance of the cyclone.The multi-phase flow model is used to analyze the overflow port,the bottom flow diameter and the depth of the overflow pipe.With the change of structural parameters,the influence of the separation efficiency,pressure drop and liquid separation ratio of the cyclone is mainly studied.The results show that the diameter of the overflow port has a great influence on the cyclone.At the same time also analyzed the bottom of the mouth diameter,overflow the depth of the insertion.