Discrete Element Analysis Of The Influence Of Coal Shape And Parameters And Transport Angle On Transport Performance

The traditional transport model uses the concept of "abrasive" design,which can reduce the wear of equipment to a certain extent.However,in the process of transportation,the material still impacts the chute and belt seriously,and reduces the service life of the transport equipment.Based on the discrete element theory,this paper aims at some problems in the traditional transshipment process,such as excessive belt impact,belt deviation,hanging and wear,and uses the discrete element simulation to explore the reasons,and seeks the optimum condition that the exit velocity of coal flow is close to the belt speed.The following aspects are described in detail:According to the new type of transportation system,a simplified transport device model is constructed by using 3-DEM curve falling coal pipe technology,which is imported into EDEM for numerical simulation.Based on the three parameters of coal particle size,particle surface energy and conveying angle of upper conveyor belt,72 different conditions were set up to simulate.Then the single variable method was used to explore the effects of material parameters and conveying angle of upper conveyor belt on the coal flow outlet velocity,and the hanging and blocking phenomena in the simulation process were analyzed.Next,based on the simulation results obtained above,the influence of different particle shapes on transport performance is explored,and it is found that the exit velocity of coal flow is closer to the particle shape with velocity,which provides a reference for material shape screening in the actual transport process.Secondly,in EDEM,the particles of different radius are mixed in a certain proportion,then the velocity of coal flow outlet is detected,and the wear situation of the transfer point and the upper and lower conveyor belts is analyzed.It is concluded that the parts with serious wear in the transfer device are the head guide plate.Aiming at the equal probability combination of material parameters and upper conveying angle at different levels,the orthogonal test table of three factors and four levels is established to analyze and select the optimal combination parameters to verify the accuracy of simulation results.Finally,combined with the similarity theory,a scaled-down model transfer device is built and field tests are carried out in the laboratory.The experimental results are basically consistent with the simulation results,which proves the reliability of EDEM numerical simulation.