Production of briquettes using coconut and eucalyptus wastes

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.

摘要 本研究分析了以椰子（Cocos nucifera）残渣与尾叶桉（Eucalyptus pellita）木材残渣制备的成型压块（briquettes）的制备工艺与性能特征。本试验采用完全随机设计，设置7个处理组，每组重复5次。各处理组的椰子残渣与尾叶桉残渣配比如下：T1：100%尾叶桉残渣；T2：20%椰子残渣+80%尾叶桉残渣；T3：40%椰子残渣+60%尾叶桉残渣；T4：50%椰子残渣+50%尾叶桉残渣；T5：60%椰子残渣+40%尾叶桉残渣；T6：80%椰子残渣+20%尾叶桉残渣；T7：100%椰子残渣。制备成型压块时，采用0.5%的羧甲基纤维素（CMC）作为黏结剂。将混合料以568 kgf·cm⁻²的压力保压3分钟。压制成型后，将压块置于空气中风干至环境平衡含水率，随后对其物理、化学与能量特性开展测试分析。本研究通过方差分析、相关性分析及层次聚类分析（HCA）对试验数据进行统计处理。结果表明，以100%椰子残渣制备的成型压块平衡含水率最高，挥发分含量偏高，固定碳含量偏低。成型压块的基本密度、表观密度与燃烧速率不受物料配比及平衡含水率的影响。