Naslov
Scale-up of fluid bed dryer

Autori
Sander, Aleksandra ; Penović, Tomislav ; Klarić, Dario

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts: 15th Ružička days "Today science - tomorrow industry" / Šubarić, Drago - Osijek, 2014, 11-11

ISBN
978-953-7005-34-4

Skup
XV. Ružičkini dani "Danas znanost - sutra industrija"

Mjesto i datum
Osijek, Hrvatska, 11.09.2014. - 12.09.2014

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
drying kinetics; fluid-bed drying; minimum fluidization velocity; scale-up rule

Sažetak
Scale-up in chemical engineering is usually based on laboratory scale experiments performed in at least two or three pieces of geometrically similar equipment and derivation of scale-up rules. Generally speaking, derivation of scale-up rules based on dimensional analysis cannot be applied on the drying process since a large number of parameters influence the drying kinetics. Taking into account only simultaneous transfer of momentum, heat and mass it is quite obvious how complex the drying process is. In fluid bed drying the situation is even more complex due to the chaotic motion of particles in the stream of hot air resulting with nonuniform hydrodynamic comditions. Besides that, the flow regime is greatly influenced by the dryer size so it is very hard to predict the drying kinetics in a larger scale dryer. In order to define the scale-up rules for a fluid bed dryer, spherical particles of Al2O3-NiO-CaCO3 catalyst have been dried in two geometrically similar laboratory fluid bed dryers. Experiments have been performed at different temperatures and flow rates of the drying air, for three bed heights. Minimum fluidization velocity was determined experimentally for both dryers. Based on the obtained results it can be concluded that the size of the dryer influences the drying kinetics of spherical particles. The drying kinetics was approximated by the Page model. Evaluated parameters were correlated with the drying conditions and the size of dryer. Scale-up rules for minimum fluidization velocity and drying kinetic curve were defined.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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