Izvorni znanstveni članak
The Influence of Granulometric Properties and Drying Conditions on the Drying Kinetics of a Nonhygroscopic Material
A. Sander
orcid.org/0000-0002-7477-3052
; Faculty of Chemical Engineering and Technology University of Zagreb, Maruliæev trg 20, 10000 Zagreb, Croatia
B. Cerjak
; Faculty of Chemical Engineering and Technology University of Zagreb, Maruliæev trg 20, 10000 Zagreb, Croatia
B. Domitrović
; Faculty of Chemical Engineering and Technology University of Zagreb, Maruliæev trg 20, 10000 Zagreb, Croatia
Sažetak
The influence of granulometric properties of the material and of the operational conditions on the drying kinetics of nonhygroscopic material was studied. Four fraction sizes of dolomite were chosen and dried in four dryers by different heating methods. Dolomite
was dried in a microwave dryer under different microwave heating powers. During convective drying the effects of temperature and superficial air velocity were monitored. Vacuum drying was carried out at different temperatures and pressures. Page’s model has shown to be successful in describing the drying kinetics throughout
the entire drying operation, irrespective of the heating mode.
Heat intensity (θ, Pm), superficial air velocity and particle size had influence on the drying kinetics. The process was facilitated by higher temperatures and superficial air velocity, higher intensity of microwave radiation and bigger particles. Change of pressure
in the vacuum dryer had no significant effect on the drying kinetics under the chosen operating conditions.
Ključne riječi
Convective drying; drying kinetic; mathematical models; microwave drying; vacuum drying
Hrčak ID:
55016
URI
Datum izdavanja:
1.7.2010.
Posjeta: 796 *