METHOD OF MODERNIZATION granulation section including granulation colony, PARTICULARLY IN THE INSTALLATION urea

摘要

Method for transforming a prilling tower intended for converting a liquid into a solid product, particularly for a urea solution, wherein the prilling basket is removed; a vertical tubular wall is built inside the tower, with at least an upper portion permeable to air; new nozzles are installed on top of the tower, to generate a polydispersed flow of drops of liquid, with descending motion, inside a channel defined by said wall; means for distributing solidification air (3) in a gap (15) defined between the outer casing of the tower and said wall (8) are provided; the tower thus transformed made a new granulation process, instead of the known prilling process, obtaining granules with high hardness equal to the hardness obtained by conventional granulation plants.