Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/8345
Título: Drying of spent coffee grounds in a cyclonic dryer
Título(s) alternativo(s): Secagem de borra de café em um secador ciclônico
Palavras-chave: Heat-mass transfer
Biomass
Physical characterization of spent coffee grounds
Gas-solid flow
Transferência de calor e massa
Biomassa
Caracterização física da borra de café
Escoamento gás-sólido
Data do documento: 1-Jul-2013
Editor: Universidade Federal de Lavras
Citação: CORRÊA, J. L. G. et al. Drying of spent coffee grounds in a cyclonic dryer. Coffee Science, Lavras, v. 9, n.1, p. 68-76, jan./mar. 2014.
Resumo: Spent coffee grounds is a byproduct from the soluble coffee company. Besides its use as animal feed or lipid source, it presents a high potential as biofuel. Whatever the application, to be useful, the product has to loose great part of its moisture content. The drying of spent coffee grounds in a cyclonic dryer was studied in the present work. Based on a experimental design, the effects of temperature of the air (T a ) (59 to 271 oC) and of the ratio mass flow rate of spent coffee grounds to mass flow rate of air (W c /W a ) (0.1 to 3.6) on the moisture reduction (M r ) and average residence time of the particles on the cyclonic dryer (APRT) were studied. It was observed an inverse relation between M r and the ratio W c /W a and a direct relation between M r and T a . Regarding the APRT, it presented an inverse relation to W c /W a . Additionally, the characterization of the spent coffee grounds was performed with respect to the centesimal composition, density and granulometric distribution. It was observed increasing the density and particle size with moisture increasing. It was shown that the cyclone could be an efficient dryer for particulate solids with the advantages of high moisture reduction within short residence time.
URI: http://repositorio.ufla.br/jspui/handle/1/8345
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