Influence of Vibropriller Basket Geometry on Droplet and Prill Trajectories in a Prill Tower

The paper investigates how the geometric configuration of a rotating vibropriller basket — specifically the radial position of the outlet holes and the angle of melt jet outflow — affects the initial velocity components and resulting trajectories of droplets and prills in a high -capacity prill tower. A mathematical model based on the numerical integration of droplet motion equations was applied to a tower with an internal diameter of 24 m, a prill flight height of 80 m and a urea melt load of 175 t/h, at a basket rotation speed of 180 rpm. It is shown that increasing the hole radius from 125 to 250 mm markedly widens the melt plume, while decreasing the outflow angle from 45° to 5° increases the horizontal velocity component by 20–25%. The results provide a basis for selecting basket geometry at the design stage of high- capacity granulation equipment.