Numerical Simulation Study On Separation Performance Of Diversion Cyclone Separator

With the rapid development and wide application of computer technology,the computer numerical simulation technology for the research of cyclone separators has emerged as the times require.The traditional cyclone separator is widely used in the industrial dust removal field because of its high gas handling capacity and high separation efficiency.However,it also has the disadvantages such as difficulty in moving,dust accumulation,and large in size and structure.In view of the shortcomings of the traditional cyclone separator,which is large in size and difficult to move,an effective solution is proposed to shorten the height of the cyclone,making it compact and easy to move,and can be used as dust removal equipment in small factories and workshops.However,the cyclone separator has the problem of lack of separation performance after shortening the height.To solve this problem,based on the mathematical model and control equations of the gas-solid two-phase flow in the cyclone separator,the force and motion characteristics of the particles in the cyclone separator after shorten the height are analyzed.Through the Reynolds stress model,the numerical simulation of the gas-solid phase flow field in the cyclone was carried out.According to the Barth equilibrium orbit theory and the boundary layer separation theory,an anti-mixing cover structure is designed for solving the problem of lack of separation performance of cyclone with shortened height,and a deflector structure is designed for improving the separation efficiency of cyclone separator.The influence of the installation position and the coverage area changing of the anti-mixing cover on the separation efficiency are analyzed.The effects of the anti-mixing cover and the deflector structure on the flow field distribution,separation efficiency,pressure loss and particle velocity in the cyclone are analyzed.In order to further improve the separation efficiency of the cyclone separator,a multi-step separation structure joint using a tangential inlet cyclone and an axial flow cyclone separator was designed.The blade installation distance,the axial length of the blade,the diameter of the exhaust port and other factors were analyzed about the effect of separator efficiency and pressure loss.Finally,an experimental platform with anti-mixing structure cyclone separator was built,and the control circuit of V20 inverter was designed.The experiment of multi-step cyclone separator and cyclone with anti-mixing cover were completed.The correctness of the numerical simulation results was verified and the correctness proves the effectiveness of the anti-mixing structure,the deflector structure and the multi-step cyclone structure design.