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 本研究分析了以椰树（Cocos nucifera）与尾叶桉（Eucalyptus pellita）木材残余物为原料制备的生物质压块的制备工艺与性能特性。试验采用完全随机试验设计，设置7组处理，每组处理重复5次。各组处理对应的椰树与尾叶桉木材残余物掺配比例如下：T1：100%尾叶桉木材残余物；T2：20%椰树木材残余物+80%尾叶桉木材残余物；T3：40%椰树木材残余物+60%尾叶桉木材残余物；T4：50%椰树木材残余物+50%尾叶桉木材残余物；T5：60%椰树木材残余物+40%尾叶桉木材残余物；T6：80%椰树木材残余物+20%尾叶桉木材残余物；T7：100%椰树木材残余物。成型块制备过程中，以0.5%的羧甲基纤维素（CMC）作为粘结剂。将混合料以568 kgf·cm⁻²的压力压实3分钟。压制成型后，将成型块置于空气中风干至环境平衡含水率，随后对其物理、化学及能量特性开展测试分析。采用方差分析、相关性分析及系统聚类分析（HCA）对试验数据进行统计处理。仅以100%椰树木材残余物制备的成型块具有最高的环境平衡含水率、较高的挥发分含量以及较低的固定碳含量。成型块的基本密度、表观比质量及燃烧速率不受其组分配比与环境平衡含水率的影响。