Abstract
Currently, most of the domestic fertilizer unit, granulation tower basically using natural ventilation, granulation tower granulation process is ejected molten urine through the nozzle to cool down after melt crystallization (phase transition), cooling 3 process[1]. The beginning step is cooling stage of liquid urea. The second step is liquid urea into solid urea particles. The last step is solid urea paticles cooling process with long drop distance. In the process of landing urea crystals, the releasing heat is taken into the cold air. The average air rate of natural ventilation in the tower is 0.4-0.8m/s. And the air rate of mechanical ventilation prilling tower is 0.6-1.2m/s. Landing time of urea particles from nozzle to Scraper is about 5-10m/s.
Published Version
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