Abstract
The pyrolysis characteristics of spruce wood and birch wood, both of two different particle sizes: 0.063-0.1 mm and 0.2-0.3 mm were investigated using thermogravimetric analyzer. The pyrolysis process was subdivided into four stages at a rate of 5, 20 and 50 K/min, varying from 30 to 600C. Below 170C, a mass loss occurred for drying and preheating the sample and a significant mass loss occurred between 230-420C. The estimation of kinetic parameters for the temperature range of 150-600C resulted in obtaining values of activation energies between 54.48-66.76 kJ/mol and 50.03-65.04 kJ/mol for spruce and birch, respectively.