Flow Field Analysis And Numerical Optimization Of The Axial Inlet Hydrocyclone Based On CFD

The hydrocyclone used for oil-water two-phase separation is widely used in petrochemical,metallurgy and environmental management industries,etc.and the axial inlet hydrocyclone is studied more and more because of its compact structure,stable internal flow field and high separation efficiency.In this paper,we study the separation performance of a hydrocyclone with spiral channel at the inlet,axial inlet and inverted cone at the bottom.In this paper,CFD software is used to simulate the hydrocyclone.The pressure field,velocity field,turbulent kinetic energy and oil phase volume fraction distribution of the large and small cone sections of the hydrocyclone are analyzed.The separation efficiency of the hydrocyclone is also calculated.The results show that the internal flow field of the hydrocyclone is relatively stable and the separation efficiency is relatively high.In order to optimize the parameters of the axial inlet hydrocyclone,the structural parameters are optimized first,and then the operation parameters are optimized after the structural parameters are determined,the influence of operation parameters on separation performance is studied to obtain the range of inlet flow rate and separation ratio when cyclone separation performance is the best.Through the numerical simulation of the hydrocyclone,the influence rules of the structural parameters such as the number of spiral flow channels,the rise angle of spiral flow channels,the height of inner cone and the diameter of inner cone bottom on the separation efficiency and pressure drop of are calculated,and then the optimum combination of structural parameters with high separation efficiency and low pressure drop is obtained by using the orthogonal test.The numerical simulation of the hydrocyclone model optimized by orthogonal test is continued by changing the inlet flow and the split ratio,in order to obtain the inlet flow and the split ratio when the hydrocyclone has the best separation performance.On the premise of high separation efficiency and low pressure drop,the hydrocyclone that we studied in this paper,reduces the radial size and has a more compact structure,which can be applied to the separation of oil and water in some places with high space requirements,and also provides theoretical support for the research and test of axial inlet hydrocyclone.