文摘
As bioeconomy principles and sustainable use of biomass resources (including the use of forest resources) are becoming increasingly important issues, it is necessary to find the right use of forest biomass with the highest added value. During the harvest of timber, forest residues are created. Currently, this residue is used in relatively small quantities, mainly for the production of forest woodchips. Coniferous woodchips are considered to be a lower quality fuel, however, using certain methods, the physical properties can be improved, and a better quality fuel can be obtained. The method for the wood fuel property improvement selected in this paper is torrefaction. This study is conducted in order to evaluate the changes in fuel properties of coniferous forest residue, in particular, spruce and pine needles and twigs, influenced by torrefaction. In this study eight different samples are prepared according to a three-factor experimental design. The moisture content, gross and net calorific value and ash content is determined in laboratory conditions. The results are analysed, and a comparison with other biomass types is carried out.
