ENERGY DENSITY MODEL FOR FOREST SPECIES FROM CERRADO

MODELO PARA DETERMINAÇÃO DE DENSIDADE ENERGÉTICA DE ESPÉCIES FLORESTAIS DO CERRADO

ABSTRACT

Wood is the main source of energy in the energy matrix of underdeveloped countries, in addition to having a significant participation in developing countries, ranking fourth in Brazil. Thus, this study aimed to determine a model for determining the energy density of forest species from the Cerrado. Samples of trunks and branches were collected from 34 forest species in an area of 10.15 ha located in the Cerrado region aiming for immediate analysis, i.e. the contents of ashes (ASH), volatile matter (VM), fixed carbon (FC), and higher calorific value (HCV). Data from dry and saturated mass were obtained in order to determine the basic density. The species presented values of VM ranging from 77 to 85.5%, ASH from 0 to 1%, FC from 14 to 23%, and HCV ranging from 18,282 to 20,121 GJ ton^-1. A significant relationship was found between VM and FC (R² = 0.9927) whereas no significant values were found between HCV and basic density. The average value of energy density considering the 34 species was 12,459 Mcal m^-3. The estimated energy density of the area was 1,378,541 Mcal ha^-1. The proposed model for calculating the energy density as a function of basic density favors energy surveys of areas to be explored since there is no need for calorific value analysis.

Keywords:
Energy; Wood; Savannah