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Influence of the pyrolysis temperature on the end-products obtained during the carbonization of Eucalyptus wood

Da Silva Vieira R., Barauna E.P., Lima J.T., Napoli A., Monteiro T.C.. 2012. In : 2012 IUFRO Conference. Division 5 Forest products, 8-13 July 2012, Lisbon, Portugal : final program, proceedings and abstracts book. Vienne : IUFRO, p. 149-149. 2012 IUFRO Conference Division 5 Forest Products, 2012-07-08/2012-07-13, Lisbonne (Portugal).

Charcoal Production and consumption from planted forests of Eucalyptus for manufacture of steel in Brazil has increased significantly in recent years. The charcoal quality is related to different factors such as the raw material nature and its carbonization process parameters. Carbonization process parameters considering the heating rate, final pyrolysis temperature and also pyrolyiss pressure used in the process.The final temperature of carbonization interferes significantly in the carbonization products and sub products, as well as in quality of charcoal. With the increased production of charcoal from planted forests of Eucalyptus the studies of the effect of temperature in the carbonization products are important. Thus, this study aimed to asses the influence of final temperature of carbonization on the end-products yields.Standardized samples were removed from four trees of Eucalyptus sp. The carbonization was conducted in experimental electric furnace adapted with water-cooled condenser and collection flask volatile condensable materials. The peak pyrolysis temperatures were equal to 500, 600, 700 and 800 °C. The gravimetric yields of charcoal, pyroligneous liquor and noncondensable gases were determined.The pyroligneous liquor yield, ie tar yield and non-condensable gases yield showed a significant difference only at higher temperatures of 700 °C and 800 °C. The charcoal yield varies between 27% and 34%, tending to decrease with increasing temperature. The average pyroligneous liquor yield is 45% and a non-condensable gas is 24.5%, both with variable behavior in relation to the carbonization temperature. The yields are consistent with those reported in the literature. Temperature of 500 ° C showed the optiumum result in trem of charcoal yield, but more investigation on charcoal quality at different pyrolysis temperatures are needed to define the best process parameters to bedefined for charcoal requirement in steelmaking.

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