Production of briquettes using coconut and eucalyptus wastes

• Published in: Revista brasileira de engenharia agrícola e ambiental 2019-11, Vol.23 (11), p.883-888
• Main Authors: Nunes, Eduardo Z., Andrade, Azarias M. de, Dias Júnior, Ananias F.
• Format: Article
• Language: English
• Subjects: AGRICULTURAL ENGINEERING; ENVIRONMENTAL SCIENCES
• ISSN: 1415-4366; 1807-1929; 1807-1929
• DOI: 10.1590/1807-1929/agriambi.v23n11p883-888

ABSTRACT This research analyzed the production and characteristics of briquettes composed of residues of Cocos nucifera and Eucalyptus pellita wood. A completely randomized design was used, having seven treatments and five repetitions per treatment. The treatments corresponded to waste percentages of coconut and eucalyptus residues as following: T1: 100% eucalyptus waste; T2: 20% coconut waste + 80% of eucalyptus waste; T3: 40% coconut waste + 60% of eucalyptus waste; T4: 50% coconut waste + 50% of eucalyptus waste; T5: 60% coconut waste + 40% of eucalyptus waste; T6: 80% coconut waste + 20% of eucalyptus waste; and, T7: 100% coconut waste. For the production of briquettes, 0.5% carboxymethylcellulose (CMC) was used as the binder. The mixtures were compacted under a load of 568 kgf cm-² for three minutes. After pressing, the briquettes were air-dried to the equilibrium moisture of the environment and, then, analyzed for physical, chemical and energy characteristics. The data were analyzed through analysis of variance, correlations and hierarchical cluster analysis (HCA). The briquettes produced with 100% of C. nucifera residues had the highest equilibrium moisture content, high volatile matter concentrations, and low fixed carbon concentrations. The basic density, the apparent specific mass and the burning rate were not affected by the composition and by the equilibrium moisture of the briquettes. RESUMO Esta pesquisa analisou a produção e as características de briquetes compostos de resíduos de Cocos nucifera e da madeira de Eucalyptus pellita. Utilizou-se o delineamento inteiramente casualizado, com sete tratamentos e cinco repetições. Os tratamentos corresponderam às percentagens de resíduos de coco e de eucalipto, como segue: T1: 100% de resíduos de eucalipto; T2: 20% de resíduos de coco + 80% de resíduos de eucalipto; T3: 40% de resíduos de coco + 60% de resíduos de eucalipto; T4: 50% de resíduos de coco + 50% de resíduos de eucalipto; T5: 60% de resíduos de coco + 40% de resíduos de eucalipto; T6: 80% de resíduos de coco + 20% de resíduos de eucalipto e T7: 100% de resíduos de coco. Para a produção dos briquetes utilizou-se como aglutinante a carboximetilcelulose a 0,5% (CMC). As misturas foram compactadas, sob uma carga de 568 kgf cm-², durante três minutos. Após a prensagem, os briquetes foram secos ao ar, até atingirem a umidade de equilíbrio com o ambiente e, em seguida, foram determinadas as características físicas, químicas e energéticas. Os da