Influence of particle size on the physico-mechanical and energy properties of briquettes produced with coffee husks
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RESEARCH ARTICLE
Influence of particle size on the physico-mechanical and energy properties of briquettes produced with coffee husks Carine Setter 1 & Carlos Henrique Ataíde 2 & Rafael Farinassi Mendes 3 & Tiago José Pires de Oliveira 3 Received: 20 April 2020 / Accepted: 4 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Briquetting is a technology with the potential to convert agricultural wastes into solid biofuels with improved handling, transport, storage, and energy efficiency characteristics. It is important to study the variables related to the briquetting process and the raw material because these parameters can affect the quality of the final product. Thus, the objective of this study was to investigate the influence of particle size on the physico-mechanical and energy properties of briquettes produced with coffee husks. Three particle size fractions were obtained: particles larger than 1.8 mm, in the range of 1.8–1.2 mm, and smaller than 1.2 mm. The coffee husk briquettes were prepared in a densification system at 120 °C and 15 MPa for 15 min. The physical, mechanical, and energy characteristics such as apparent density, volumetric expansion, compressive strength, abrasion resistance, and energy density were determined. A combustibility test was also carried out. The results showed that particle size influenced the apparent density, compressive strength, and energy density of the briquettes. However, there was no significant difference in the volumetric expansion or abrasion resistance of the densified products among the treatments. In general, the briquettes made with particles smaller than 1.2 mm had better physico-mechanical and energy characteristics. Keywords Biofuels . Briquettes . Coffee husks . Densification
Introduction Environmental concerns such as the mitigation of harmful gases in the atmosphere and energy security have encouraged Responsible editor: Philippe Garrigues * Tiago José Pires de Oliveira [email protected] Carine Setter [email protected] Carlos Henrique Ataíde [email protected] Rafael Farinassi Mendes [email protected] 1
Department of Forest Sciences, Federal University of Lavras, Lavras, MG 37200-000, Brazil
2
Federal University of Uberlandia, Faculty of Chemical Engineering, Av. João Naves de Ávila, 2121, Block 1 K, Uberlândia, MG 38408-144, Brazil
3
Department of Engineering, Federal University of Lavras, Lavras, MG 37200-000, Brazil
the exploitation of renewable sources as energy alternatives. Lignocellulosic biomass is a renewable source that has attracted attention as a raw material for obtaining high value products, including biofuels, value-added chemicals, and densified fuels. Lignocellulosic wastes can be classified into two basic types: forest wastes and agricultural wastes (Xu et al. 2015). Agricultural wastes are more promising because these wastes are available in large amounts, have low inherent value, and do not compete with food sources (Anwar et al. 2014). According to the International Coffee Organization (ICO
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