Comportamento térmico, emissão de gases condensáveis e não condensáveis no processo de carbonização da madeira

The main objective of this study was to evaluate wood thermal degradation and the release of condensable and non-condensable gases during charcoal production from Eucalyptus spp. with approximately seven years old. The wood samples were from a clonal test of a forest company from Divinesia, Minas Gerais State, Brazil. Thermogravimetric analysis (TGA/DTA) and carbonizations in muffle were carried out to determine the wood thermal performance and emission factor of non-condensable and condensable gases. Wood thermal degradation presented opposite performance of carbon dioxide (CO 2 ), carbon monoxide (CO), methane (CH 4 ), hydrogen (H 2 ) and condensable gases, presenting a minimum of degradation point and maximum emission at temperatures of 300 °C and 350 °C, respectively. During carbonization process it was observed three distinct behaviors: drying the wood in temperatures near 200 °C; maximum peak emission of CO 2 , CO and pyrolignous in temperature range corresponding to 300 °C and 450 °C; and CH 4 and H 2 gases increases according to temperature increases from 300 °C.