Abstract：In order to figure out the meso and microscopic characteristics during bulk material being conveyed within the vertical screw conveyor and reduce the swirl flow near the screw shaft and increase the axial velocity of particles near the wall during the particulate being conveyed, the different shape screw blades were surveyed, by means of the software of particle simulation EDEM 2.5, numerical test was done, the standards of performance such as particle velocity, power consumption,energy dissipation and average mass flow rate within the vertical screw conveyor were simulated. The trend charts were plotted based on the data processing software Origin Pro 8.0, to analysis the changes of indicators. The result shows that compared with the line type screw blade, the curved screw blade of tangential velocity near the shaft is reduce by 73.87%, the vortex motion decreases evidently. The axial velocity near the wall is increased by 12.34%, the extra energy dissipation effectively reduces on the basis of finishing the intended work, which promotes the whole performance of vertical screw conveyor

Keywords: vertical screw conveyor; force bridge; discrete element method; screw blade