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Drying of spent coffee grounds in a cyclonic dryer
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O processo de secagem em um secador ciclônico foi estudado para borra de café, um sub-produto da indústria de café solúvel. Com base em planejamento experimental, os efeitos da temperatura do ar (Ta) (59 a 271 ºC) e a razão vazão mássica de borra de café, por vazão mássica de ar (Wc/Wa) (0,1 a 3,6) , na redução do teor de umidade (Mr) e no tempo de residência médio das partículas no secador ciclônico (APRT) foram estudados. Foi observada uma relação inversa entre Mr e a razão Wc/Wa e uma relação direta entre Mr e Ta. Com relação ao APRT, esse apresentou uma relação inversa com relação a Wc/Wa. Adicionalmente, a caracterização da borra de café foi feita com relação à composição centesimal, densidade e distribuição granulométrica. Foi observado um aumento na densidade e no tamanho de partículas com o aumento do teor de umidade.
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 (Ta) (59 to 271 ºC) and of the ratio mass flow rate of spent coffee grounds to mass flow rate of air (Wc/Wa) (0.1 to 3.6) on the moisture reduction (Mr) and average residence time of the particles on the cyclonic dryer (APRT) were studied. It was observed an inverse relation between Mr and the ratio Wc/Wa and a direct relation between Mr and Ta. Regarding the APRT, it presented an inverse relation to Wc/Wa. 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.
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 (Ta) (59 to 271 ºC) and of the ratio mass flow rate of spent coffee grounds to mass flow rate of air (Wc/Wa) (0.1 to 3.6) on the moisture reduction (Mr) and average residence time of the particles on the cyclonic dryer (APRT) were studied. It was observed an inverse relation between Mr and the ratio Wc/Wa and a direct relation between Mr and Ta. Regarding the APRT, it presented an inverse relation to Wc/Wa. 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.
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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.
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