Study On Energy-saving Method Of Dilute Phase Pneumatic Conveying System Based On Soft Fin Vibration

As a new type of conveying system,pneumatic conveying system has been widely used in foundry industry,chemical industry and port transportation.Although the pneumatic conveying system has low cost,high transmission efficiency and low pollution,but the particles collide in the transport process.What's worse,the collision will lead to particle breakage and cause the pipeline to be worn.In order to solve these problems,the speed of airflow was reduced as low as possible,but lower airflow velocity can cause a blockage in the pipe.Therefore,the important improvement index of pneumatic conveying system was to reduce the energy loss and the airflow velocity as far as possible.The purpose of this study was to develop an energy saving device for pneumatic conveying system by means of experimental research and theoretical analysis.Firstly,a pneumatic conveying experimental platform was builded.Horizontal,vertical and inclined 45 degrees of soft wings were installed at the particle feed.Pressure sensors were used to get the pressure loss of pneumatic conveying system,then energy loss and additional pressure loss coefficient of the pneumatic conveying system were calculated,and evaluation of energy-saving effect of soft wings was carried out.The experimental results showed that the pressure drop and energy loss of pneumatic conveying system were lower under the condition of the installation of horizontal,vertical and inclined 45 degrees soft wings,so it was proved that the energy saving device can solve the blockage of pipeline and energy consumption.Secondly,the best economic speed obtained by the experiment was defined as the initial parameter.Meantime,the pressure loss was setted as the evaluation criteria.Comparing the results of numerical simulation and experiment results,it is showed that pressure loss under the condition of without soft wings can well agree with the experimental results,so it was proved that the initial parameters and the numerical models were accurate.At last,the three-dimensional modeling of pneumatic conveying system was carried out,and the grids were divided.Based on the CFD-DEM coupling model,the numerical simulation of gas-solid two-phase flow was carried out to study the effect of the installation of horizontal,vertical and inclined 45 degrees wing on the velocity of particles,tangential force and normal force.The results show that the particles were accelerated and suspended under the condition of installing the horizontal,vertical and inclined 45 degrees soft wings,and the tangential force and normal force of the particles were larger than that of without soft wing.