Avaliação de três madeiras nativas do cerrado goiano visando à utilização energética

Abstract

Studies aimed at expanding the knowledge of woods from cerrado can contribute to the correct management of the species. The aim of this study was to evaluate the quality of wood and charcoal of three species from cerrado (Tachigali vulgaris, Myracrodruon urundeuva, and Amburana cearensis) for energy purposes. Two trees per species were sampled and, from these, disks were removed from the base, at 25, 50, 75, and 100% of the total height. For wood, the properties basic density, chemical analysis, carbon stock, higher (HHV) and lower (LHV) heating values were determined longitudinally. Carbonizations were carried out in a muffle furnace with a final temperature of 450 ºC and heating rate of 1.67 ºC.min-1. There was no effect of longitudinal position under the wood basic density. Myracrodruon urundeuva wood had the highest basic density and HHV, as well as the lowest content of volatile matters. The Tachigali vulgaris charcoal had the lowest bulk density (298 kg.m-3) and low ash content (1.14%), but a high content of fixed carbon and HHV. Charcoal of the species M. urundeuva stood out with high apparent relative density (475 kg.m-3). The order of the best species is M. urundeuva, A. cearensis, and T. vulgaris.