Veuillez utiliser cette adresse pour citer ce document : https://hdl.handle.net/10953/1550
Titre: Experimental studies on mass transfer during convective drying of spent coffee grounds generated in the soluble coffee industry
Auteur(s): Gómez-de la Cruz, Francisco J.
Palomar-Carnicero, José M.
Hernández-Escobedo, Quetzalcoatl
Cruz-Peragón, Fernando
Résumé: Drying is a very important stage in the treatment of spent coffee grounds destined to biofuels production. The mass transfer during the convective drying of spent coffee grounds generated in the soluble coffee industry (SCG-SCI) is analyzed. An experimental design from sixteen isothermal drying experiments for different sample thicknesses (5mm, 10mm, 15mm and 20mm) and drying air temperatures (100ºC, 150ºC, 200ºC and 250ºC) using a drying air velocity of 1m/s was proposed. Drying times, drying rates and effective diffusivity coefficients were obtained. Drying curves were fitted with the main mathematical model proposed in the literature and drying rates were studied from the moisture ratio and the drying air temperature. Constant and time-dependence effective diffusivity were evaluated using polynomial surface models. Drying times range between 18 minutes (test at 5 mm and 250ºC) and 3 hours (test at 20 mm and 100ºC). Drying rate and effective diffusivity values were found between 0.0000226 and 0.001722 s-1 and 1.79·10-9 and 29.1·10-9 m2/s, respectively. The main differences between these experiments and those carried out by the same authors about the drying of spent coffee grounds obtained in the services sector (SCG-SS) were studied and analyzed.
Mots-clés: Biofuels
drying rate
drying
Effective diffusivity
Mathematical modeling
Spent coffee grounds
Date de publication: jui-2021
metadata.dc.description.sponsorship: This work has been conducted with the financial support of the Spanish “Consejería Andaluza de Innovación, Ciencia y Empresa” through the research projects AGR-6131 (“Modelado y Control de secadero rotativo de orujo”) and AGR-6509 (“Producción de biocombustible utilizando hueso de aceituna y residuos de poda de olivo”) as part of the research program “Proyectos de Excelencia de la Junta de Andalucía 2010-2014”. The authors gratefully acknowledge the financial support provided. The authors gratefully acknowledge to the University of Valladolid (Spain) the contribution of the industrial spent coffee grounds as well.
Editeur: SPRINGER
Référence bibliographique: Gómez-de la Cruz, F. J., Palomar-Carnicero, J. M., Hernández-Escobedo, Q., & Cruz-Peragón, F. (2021). Experimental studies on mass transfer during convective drying of spent coffee grounds generated in the soluble coffee industry. Journal of Thermal Analysis and Calorimetry, 145(1), 97-107.
Collection(s) :DIMM-Artículos

Fichier(s) constituant ce document :
Fichier Description TailleFormat 
ACCEPTED MANUSCRIPT-CLEAR VERSION.pdfACCEPTED MANUSCRIPT1,22 MBAdobe PDFVoir/Ouvrir


Ce document est protégé par copyright


Ce document est autorisé sous une licence de type Licence Creative Commons
Creative Commons