Influência da taxa de aquecimento na produção do carvão da madeira de Eucalyptus spp.

Abstract

This work aims to evaluate two carbonization marches and the fresh material collected in a Eucalyptus stand, located in Araripina - PE, in the northeastern backlands, using several clones who being homogenized to evaluate the practices. The Eucalyptus' samples were transformed into chips and underwent a drying process in an oven regulated at 65ºC ± 5ºC for 48-72 hours, until they reached constant weight, obtaining the moisture content and bulk density. Part of the biomass was intended for immediate chemical analysis and to estimate the superior calorific value, and the rest was used to the carbonization process. The gravimetric yield, immediate chemical analysis, and estimation of the superior calorific value of the charcoal produced were determined. Regarding the immediate chemistry analysis, it was possible to observe the reduction of volatile material contents and increase of fixed carbon after the carbonization process. The estimated calorific value was 4357.35 kcal.kg-1 for the fresh sample and 7220.28 kcal.kg-1 for the first march and the second march, related to the charcoal, was 7265.15 kcal.kg-1. Thereby, the second gear is better to use as charcoal because it has a shorter carbonization time and it has the same quality when compared to the first gear for the variables used.