CFD modeling of an industrial scale two-fluid nozzle fluidized bed granulator

[Display omitted] •Modeling of three-phase dense bottom spray fluidized bed granulation of urea.•Solving heat and mass equations in a simulated industrial-scale granulator.•Droplets’ diameter determination in atomization process.•Comparing simulated bed height with measured industrial data.•Determin...

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Vydáno v:	Chemical engineering research & design Ročník 159; s. 605 - 614
Hlavní autoři:	Tabeei, A., Samimi, A., Mohebbi-Kalhori, D.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Rugby Elsevier B.V 01.07.2020 Elsevier Science Ltd
Témata:	Atomization Atomizing Bed expansions CFD Computational fluid dynamics Computational mathematics Computer simulation Drop size distribution Droplets Dynamic models Eulerian–Lagrangian approach Fluid dynamics Fluidization Fluidized bed reactors Fluidized beds Granulation Granulators Moisture content Nozzles Simulation Three dimensional models Two-fluid nozzle Urea CFD Eulerian–Lagrangian approach Two-fluid nozzle Fluidization Atomization
ISSN:	0263-8762, 1744-3563
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Shrnutí:	[Display omitted] •Modeling of three-phase dense bottom spray fluidized bed granulation of urea.•Solving heat and mass equations in a simulated industrial-scale granulator.•Droplets’ diameter determination in atomization process.•Comparing simulated bed height with measured industrial data.•Determination of temperature changes and water content evaporation in system. A 3D computational fluid dynamic modeling of atomization and fluidization of urea was simulated in an external mixing, bottom spray, fluidized bed granulator. The Eulerian–Lagrangian approach was used to predict the mean diameter of melt urea droplets similar to the droplets produced by an industrial scale two-fluid nozzle under hot atomized air. Temperature changes and evaporation of water content from droplets were determined during simulations. Furthermore, three-phase fluidization was simulated in the Eulerian approach whereby the bed expansion of the granulator was predicted. The mean diameter of droplets and bed height were found in good agreement with the empirical correlation and the real bed height, as characterized by a level transmitter instrument in the industrial granulator, respectively. The important features of this study included solving mass, heat and hydraulic equations simultaneously, as well as simulating a real urea fluidized bed granulation unit.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14
ISSN:	0263-8762 1744-3563
DOI:	10.1016/j.cherd.2020.05.020