Study On The Performance Of A Cyclone Separator With Volute Inlet Separating Caustic-Burned Magnesia Powder

In the process of the development of technology of calciner with dynamic rotating flow for caustic-burned magnesia powder,it is necessary to improve the recovery index of the product and reduce the power loss of the system.The cyclone separator with volute inlet is the most important equipment in the system.Therefore,it is the key to improve the separation performance.In order to improve the separation efficiency of the cyclone separator with volute inlet,reduce the pressure loss and optimize the structure size,The distribution regular of turbulence flow and separation characteristics of gas-solid two phase in the cyclone separator with volute inlet should be further studied.In this paper,the separation performance of a cyclone separator with volute inlet is studied by cold test and numerical simulation.The main contents and results are as follows:First,the influence of inlet velocity,inlet concentration and particulate property and other parameters on the separation performance of the cyclone separator with volute inlet was studied by establishing the separation performance test platform.The results show that the static pressure drop of the cyclone separator with volute inlet increases with the increase of the inlet wind speed.The relationship between static pressure drop and inlet wind speed of the spiral case cyclone separator is fitted through average resistance coefficient method.According to the product recovery index of the calciner with dynamic rotating flow system,the optimum inlet wind speed is obtained.It is found that the proper increase of the inlet particle concentration can not only improve the separation efficiency,but also reduce the pressure loss in the range of concentration studied in this paper.Secondly,using the cold test model as the object,the RSM turbulence model is used to study the three-dimensional gas flow field of the cyclone separator with volute inlet.The reliability of the model is verified by the relation between the inlet velocity and the static pressure drop of the cyclone separator with volute inlet.Through the study:In terms of velocity distribution,it is found that the symmetry of the velocity distribution of the cylindrical section is poor,while the symmetry of the cone segment is better.The tangential velocity in the separation space within the cone bottom of the distribution is not uniform,showing the fishtail phenomenon obviously.In addition,The turbulent kinetic energy and turbulent energy dissipation rate are axisymmetric distribution along the radius direction,and the strong turbulent zone is found in the annular separation space near the exhaust pipe.Finally,the gas-solid two-phase flow is studied on the basis of the gas phase flow field.In this paper,three phenomena that affect the separation efficiency are found by tracing the single particle trajectories,and the best entry position is found through the trajectory tracking of the particle group.At the same time,it is also found that the Dirgo pressure drop empirical model can predict the pressure loss of the cyclone separator with volute inlet to a certain extent.The influence of the change of inlet velocity on the separation efficiency is larger.When the particle size is 1?m,the separation efficiency of the inlet wind velocity of 26m/s is less than the separation efficiency of the velocity of 22m/s.