Caracterização de briquetes produzidos com resíduos de madeira de Eucalyptus sp. e Pinus sp.

Abstract

The objective of this work was to characterize different types of briquettes produced from wood residues of Eucalyptus sp. and Pinus sp.. Were determined as physicochemical and energetic properties of briquettes, such as apparent mass, moisture content, volatile content, fixed carbon content, ash content, friability and superior and useful calorific value. The current study followed the methodologies of the operational standards of Embrapa Forests, ABNT NBR 7190/97 and ABNT NBR 8740/85 with adaptations. Among the results, the apparent specific mass was higher in the briquettes produced with residues of Eucalyptus sp. Lot 3, with 1.21g/cm³, differing from those produced with Pinus sp., Lot 1, with 0.865g/cm³, and lot 2, with 0.937g/cm³. The briquettes of Lot 2 presented the highest moisture content, with 11.21% in the wet base and 12.63% in the dry base. The highest ash content is observed in lot 1, 1.49%. The volatile materials and the fixed carbon of the three lots of briquettes surveyed were similar. The moisture and granulometry of the particles that composed the briquettes can interfere in the compacting capacity and, consequently, in the apparent specific mass and friability of the material. In addition, the moisture content changes the availability of surplus energy after the combustion of briquettes.