Large Volume Inorganic Chemicals - Ammonia ... - ammk-rks.net

Chapter 88.4.6 Redirecting fines to the concentrated urea solutionDescriptionWhen granulation is applied as a finishing technique, oversized and undersized products arerecycled to the granulator and form the nuclei of the granules. Dust is often separated after thegranulator and also redirected to the installation, where it is taken along with the fluidisation airto the scrubber and ends up in a dilute solution. This solution is concentrated due toevaporation. However, it is also possible to redirect the dust to concentrated solution instead tothe granulator [52, infoMil, 2001].Achieved environmental benefitsEnergy savings.Cross-media effectsNone believed likely.Operational dataNo specific information provided.ApplicabilityApplicable to all urea plants where a solidification process is applied.YARA Sluiskil, applied this technique in 1999, and saves about 32000 tonnes of steam per year[52, infoMil, 2001].EconomicsThe project cost was EUR 143000, implemented in 1999.Driving force for implementationCost benefitsReferences to literature and example plants[52, infoMil, 2001],YARA, Sluiskil346 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers