Abstract: The feeding device is the key part of the gas-solid mixing in pneumatic conveying system.The change of the pressure loss and the conveying efficiency of the whole system will be caused by particle collision in feeding device.Based on the condition that two-phase in feeding device under the particle collision has dual nature of particle discrete phase and gas continuous phase,a coupling numerical simulation of the gas-solid two-phase flow in a feeding device has been perforemed with the help of the Fluent and EDEM software by using the CFD-DEM coupling method,focusing on the research of the pressure distribution characteristics under the particle collision.By comparing with the simulation results of CFD,analyzes the variation law of pressure characteristics under the condition of particle collision.The results show that the particle collision in feeding device mainly affect the characteristics of pressure changes in the gas-solid mixing stage,and will reduce the pressure loss in the pipeline,promote the uniform of outlet section dynamic pressure distribution,and improve the overall conveying efficiency.

Key words: feeding device, particle collision, two-phase flow, pressure characteristics