The Flow Field Analysis And Parameters Optimization Of The No Power Dust Removal Device In Dropped Coaltransportation System

Belt conveyor in the mining,metallurgy,steel,coal,pharmaceutical and other important national economic lifeline has a wide range of applications.but since the reform and opening up,people's work environment and physical and mental health requirements are getting higher and higher.And the existing transport system,most of the working environment there are dust emissions are too high,the health of construction workers caused great damage to the problem,the pollution of dust pollution will not only reduce the service life of the transfer station,fire or explosion accident is not The recovery of the loss,more importantly,will endanger the human respiratory system and good health,then the traditional transfer station improvement,so that as much as possible to reduce dust emissions,more and more attention by the community.The belt conveyor is much higher than 10 m,the material flow is free to fall under the action of gravity.The huge impact force will not only damage the conveyor belt,reduce the service life of the conveyor belt,but also the induced wind caused by the falling of the material.Resulting in the export of the trough and a large number of dust around the overflow,the equipment will inevitably run when the impact of vibration,but also make a lot of powder caused by the second flight,seriously endangering the physical and mental health of employees.Induced wind flow is the leading factor leading to the diffusion and flying of coal dust.It is the key to change the characteristics of dust and dust.It is reasonable and effective to organize and guide airflow.At present,most of the research on the non-power dust removal technology in the guide trough is focused on the application of its technology,and the selection of the power-free dust guide trough is basically determined according to the dust characteristics and the actual working conditions.This paper using Solidworks to establish the initial geometric model of the system,and use the CFD simulation software Fluent to set the boundary conditions to calculate the dust concentration under the original operating conditions.Next divide the grid,and tosimulate the different grid size,compare the size of the grid size of the impact of the results;and determine the final use of the calculation of grid size;Then the effect of structural parameters such as belt speed,transport volume and return pipe diameter on the dust concentration at the outlet of the guide tank is analyzed by a single variable method.Then using MATLAB,combined with CFD simulation and orthogonal table,BP neural network and genetic algorithm to obtain the optimal combination of parameters.At the last according to the actual size of the transport system,do 1:10 proportional reduction model to verify the correctness of the simulation.