Research On Separation Performance Of SHS50 Vane-guided Solid-liquid Hydrocyclone

Hydrocyclones are widely used in petroleum,chemical,mineral processing,pharmaceutical and papermaking industries because of their advantages,such as simple structure and operation,high separation efficiency,low maintenance costs and so on.In this paper,effects of structural parameters,operating parameters and physical parameters on separation performance of SHS50 vane-guided solid-liquid hydrocyclone were investigated by experimental methods,and experimental data were analyzed by regression to establish mathematical models for predicting separation performance of the hydrocyclone.Then,threedimensional velocity field and distribution of particle concentration field in the hydrocyclone were analyzed by numerical simulation.First of all,a novel overflow with concave ring was presented,and effects of overflow diameters and lengths of tail pipe on separation performance were studied,and the optimal structure of hydrocyclone was determined.On the above basis,effects of operating parameters(flow rate and underflow rate)and physical parameters(concentration and material of particles)on separation performance were investigated.The results were that separation efficiency increased with increasing flow rate,underflow rate and size of particle,and decreased with increasing concentration.In addition,pressure drop increased exponentially with increasing flow rate,but changed little with other parameters.Secondly,according to flow characteristics and force analysis of particles in hydrocyclone,experimental data were analyzed by regression to establish mathematical models for predicting separation efficiency and pressure drop respectively.Compared with experimental values,regression models had high accuracy and could meet the demand of engineering design.Thirdly,the three-dimensional velocity fields and distributions of particle concentration fields in hydrocyclone were numerically simulated by Reynolds Stress Model(RSM)and Eulerian model.The results showed that tangential velocity presented bimodal distribution in cylindrical section,and the second peak weakened along axial position downward.LZVV divided flow field into upstream and downstream,and radial velocity firstly increased and then decreased with increasing radius at bottom region of cone section and tail pipe section.Besides,distributions of fine particles were more uniform,and coarse particles were mainly concentrated near the wall.Furthermore,effects of operating parameters and physical parameters on distributions of tangential velocity and particle concentrations were studied.It was found that the tangential velocity increased with increasing flow rate,underflow rate,and particle density,and decreased with increasing concentration and liquid viscosity.Moreover,flow rate,concentration,particle density and liquid viscosity had significantly influence on overall distribution of particles,and underflow rate mainly affected distribution of particles at the bottom outlet.