Study On Separation Efficiency And Structure Of QDK Type High Efficiency Separator

As a basic building material,cement is constantly improving its quality and service performance..A large number of experiments and studies have proved that the particle size distribution of cement is a kind of fineness parameter which has a clear quantitative relationship with the cement performance.As the main equipment of cement production,the powder selecting machine is an important part to adjust the cement particle size distribution.Therefore,it is very necessary to study the classification technology and equipment of powder separator.In this paper,the numerical simulation is used to study the classification performance of the classifier.In order to verify the feasibility and accuracy of the numerical simulation,the existing equipment is verified by experiments.In addition,according to the results of numerical simulation,the structure of the powder selecting machine is improved in order to improve the performance of the separator.First of all,based on the law of conservation of fluid flow on the introduction of the gas phase and solid phase mathematical model,provide the basis for the research of the separator;in order to analyze the stress state of single particles in the separator annular region,the cement particle size grading formula is deduced,providing a theoretical support for the classification process of cement particle.Secondly,the classification efficiency of the classifier is tested.Under actual operating conditions,the actual density of cement particles and the particle size distribution of cement materials were measured.The optimum gradation of cement particle size distribution was summarized,which provided the basis for improving the classification performance.Thirdly,this paper uses the computational fluid dynamics software to carry on the simulation analysis to the sorting process.Through analyzing the distribution of velocity,pressure and turbulence in the flow field of the powder separator,it is found that there is a problem that the velocity distribution is uneven and the energy consumption is too large.In order to observe the trajectory and motion characteristics of solid particles more intuitively,the steady state and unsteady state tracking.On this basis,the numericalsimulation and the experimental results are compared to verify the accuracy of the numerical simulation.Finally,in view of the problems of the powder selecting machine,a new type of wind turbine blade structure is designed in this paper,and the radial velocity and tangential velocity are compared with the standard deviation method.The results show that the uniformity of the velocity distribution and the energy consumption of the annular region are effectively improved,and the classification efficiency of the classifier is significantly improved.In addition,in order to improve the classification ability of the classifier,this paper discusses the influence of the different height of the rotor cage on the classification performance of the classifier.