Optimization Of Structure Of Internal Flow Pressure Screen Sieve Based On Numerical Simulation Technology

With the continuous improvement of the quality requirements for paper products in the country,the requirements for pulp pressure screening equipment in the paper industry are continuously increasing.Computational Fluid Dynamics(CFD)has been rapidly developed and applied in many fields.In the paper industry,the use of computational fluid dynamics to optimize and design new types of pressure screen equipment has become an important approach.In order to improve the performance of the paper pressure screen,the internal flow field of the pulp pressure screen was studied,and the influence of the structure parameters of the inner flow screen on the work efficiency was discussed.In this paper,ZSLa-type inflow pressure screen(rotor is located outside the drum)as the research object,the combination of numerical simulation and optimization analysis method to study the impact of screen drum structure parameters on the internal flow pressure screen work efficiency.The working principle and structural analysis of the in-flow pressure screen and the backwashing phenomenon of the in-flow pressure screen are described.Through the theoretical analysis of the flow field of the pulp and the derivation of the equation of motion,the basic mathematical physics simulation of the pulp movement is obtained.Establish mathematical models and geometric models for inflow pressure screens.The simulation analysis of the original size model of the pressure screen,through the analysis found that the simulation results are consistent with the actual pulp flow situation.The simulation of the flow field at the entrance of the screen stick was carried out and it was found that the shape of the entrance of the stick has an influence on the flow of the pulp.Through the numerical simulation of the model A point position,the width of the screen slot,the angle of the bar inclination and the length of L,the effect of the rod structure on the flow field of the pulp was found.Through the influence law,they found a suitable size.The response surface optimization method was used to optimize the simulation results.The regression equations for the relationship between the position of A point,the width of the screen gap,the inclination angle of the rod,and the length of L were obtained.By solving the regression equation,the optimum was obtained solution.By analyzing the variance of the regression equation,it is found that the position A has the greatest influence on the flow rate of the pulp.