Influência das dimensões da madeira na secagem e nas propriedades do carvão vegetal

• Autor(a) principal: Pinheiro, Márcia Aparecida
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3127
• topic: Comprimento; Diâmetro; Casca; Permeabilidade; Friabilidade; Length; Diameter; Bark; Permeability; Friability; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS

The present study was made for evaluating the diameter effect in the wood s natural drying and friability of the charcoal. Five year old Eucalyptus urophylla wood that came from the city of Viçosa/MG was used. The experiment was installed using logs with and without bark, in three diametrical classes and three sizes. The logs were disposed in a structure that was 0,6 meters away from the ground, inside a covered shed. The log s initial humidity and the drying follow-up was made through weekly weighings during all the observation time. The wood s proprieties were determined in the base-top direction in the marrow-bark direction. For the charcoal, the carbonizations in duplicate ware made for each of the three diametrical classes analyzed. The carbonization was conducted in a container-type oven, with the time varying from 6 to 13 hours. The physical and chemical proprieties and the friability of the charcoal were then determined. For the statistical analysis realization, the data were submitted to the variance analysis and, when differences were established among them, the Tukey Test at 95% significance was applied. The logs were exposed to drying conditions until they reached a moisture content of approximately 30%. The class of diameter, length and bark significantly affected the drying of wood and that wood of smaller lengths associated with smaller diameters and the absence of bark high moisture shell lost over time drying. Evaluating the friability of the produced charcoal in function of the diametrical class variability, it s proved that charcoal that comes from wood of greater diameter tends of having more friability.