RESEARCH ON THE WEAR CHARACTERISTICS OF HORIZONTAL TO VERTICAL BENDS OF DILUTE-PHASE PNEUMATIC CONVEYING BASED ON CFD-DEM METHOD

To solve the problem that thin phase pneumatic conveying elbow is easy to wear, the particle mass flow rate, gas velocity, bending diameter ratio and particle size are selected as the influencing factors. The orthogonal test of four factors and four levels is carried out by using CFD-DEM coupled numerical simulation. The results of bending pipe wear, particle velocity and system pressure drop under different conditions are obtained. The results show that the particle mass flow and gas velocity have significant effects on the above three evaluation indexes, while the bending diameter ratio and particle size have no significant effects on the particle velocity and bending wear. Under the discussed conditions, the factors corresponding to the minimum wear are: mass flow rate of 0.5kg/s, gas velocity of 30 m/s, bending diameter ratio of 4.5D, particle size of 2.5mm.