CHARACTERIZATION AND STATISTICAL CORRELATION BETWEEN CHARCOAL’S PHYSICAL AND MECHANICAL PROPERTIES OF <i>Eucalyptus</i> AND <i>Corymbia</i> CLONES

Abstract

The study aimed to analyze the physical and mechanical properties of charcoal from eucalypt clones by principal component analysis and demonstrate the relationships between these properties, in order to assess which charcoal property should aimed in the process to obtain a higher quality product. In this way, was cut eight clones of Eucalyptus and two of Corymbia, collecting three trees per clone and five disk in different heights. The disks were transformed into test samples, totaling an average of 75 samples per clones, which were carbonized under specific conditions for analysis of apparent density, compressive strength parallel to grain and linear and volumetric degradation due to high temperature. It is noteworthy that the data were weighted by disk and per tree, to an average closer to reality. For correlations, was used multivariate analysis of principal components. Herein, it is found that the apparent density of charcoal acts as the focal point of the other properties studied, and observed that as the higher the density, higher will be the compressive strength parallel to grain, the elastic modulus and the gravimetric yield. Keywords: energetic characteristics; principal components analysis; Eucalypt. RESUMOO estudo teve como objetivo analisar as propriedades físicas e mecânicas do carvão de clones de eucalipto por análise de componentes principais e demonstrar as correlações entre essas propriedades, a fim de avaliar qual propriedade de carvão deve ser almejada no processo para obter um produto de alta qualidade. Desta forma, foram cortados oito clones de Eucalyptus e dois de Corymbia, coletando três árvores por clone e cinco discos em diferentes alturas. Os discos foram transformados em amostras para ensaio, totalizando uma média de 75 amostras por clones, que foram carbonizados sob condições específicas para a análise da densidade aparente, compressão paralela às fibras e degradação linear e volumétrica devido à alta temperatura. Vale ressaltar que os dados foram ponderados pelo disco e por árvore, para a uma média mais próxima da realidade. Para as correlações, foi utilizada a análise multivariada de componentes principais.

Rendimento gravimétrico da carbonização e caracterização qualitativa do carvão vegetal em clones de híbridos de <i>Corymbia</i> spp para uso industrial

“…Os resultados são considerados satisfatórios e potenciais para utilizações energéticas, especialmente na siderurgia, que necessita de carvão mais denso possível, pois, para um mesmo volume, a densidade está relacionada ao volume ocupado pelo biotermoredutor no alto forno. Sabe-se que quanto maior a densidade aparente do carvão, maior será a sua resistência mecânica, maiores serão os estoques energéticos e de carbono fixo (PROTÁSIO et al, 2013;MOUTINHO et al, 2017), interferindo, positivamente, no consumo específico do reator.…”

PHYSICAL, MECHANICAL AND ENERGETIC PROPERTIES OF Tachigali chrysophylla UNDER DIFFERENTS FINAL CARBONIZATION TEMPERATURES

“…Da Silva et al (2007), when working with residues of three wood species in Para, obtained averages between 0.380 g.cm -3 and 0.530 g.cm -3 for carbonized charcoal in brickwork furnace, in large scale. Moutinho et al, (2017), when analyzing the properties of eight clones of Eucalyptus, which are the most used species in the national production of energy, observed values varying between 0.31 g.cm -3 and 0.39 g.cm -3 . It is important to highlight that the species in this study even not being genetically improved already demonstrates a high energetic potential.…”

“…Three trees of Tachigali chrysophylla were selected at random and branches residues after second bifurcation were collected. One radial board from each branch per tree was cut in samples of 20x20x40mm³ perfectly oriented, according to Moutinho et al (2017).…”

“…The mechanical strength and the modulus of elasticity at parallel compression of the fibers of charcoal samples were determined in a EMIC DL300KN universal tests machine, according to the methodology proposed by Moutinho et al (2017).…”

Correlation between compression strength parallel of wood and charcoal of Eucalyptus clones

“…The values of compression strength parallel to the grain of the charcoal observed for the clones ranged from 6.90 to 8.81 MPa. Moutinho et al (2017) studied the mechanical behavior of charcoal from 8 species of Eucalyptus sp. and observed resistance values between 7.32 and 13.62 MPa.…”