Generalization of drying curves in conductive/convective drying of cellulose

AUTOR(ES)

Stenzel, M., Motta Lima, O.C., Pereira, N.C., Mendes, E.S.

FONTE

Brazilian Journal of Chemical Engineering

DATA DE PUBLICAÇÃO

2003-03

RESUMO

The objective of this work is to analyze the possibility of applying the drying curves generalization methodology to the conductive/convective hot plate drying of cellulose. The experiments were carried out at different heated plate temperatures and air velocities over the surface of the samples. This kind of approach is very interesting because it permits comparison of the results of different experiments by reducing them to only one set, which can be divided into two groups: the generalized drying curves and the generalized drying rate curves. The experimental apparatus is an attempt to reproduce the operational conditions of conventional paper dryers (ratio of paper/air movement) and consists of a metallic box heated by a thermostatic bath containing an upper surface on which the cellulose samples are placed. Sample material is short- and long-fiber cellulose sheets, about 1 mm thick, and ambient air was introduced into the system by a adjustable blower under different conditions. Long-fiber cellulose generalized curves were obtained and analyzed first individually and then together with the short-fiber cellulose results from Motta Lima et al. (2000 a,b). Finally, a set of equations to fit the generalized curves obtained was proposed and discussed.

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