Wood residues generated by forestry and small-scale forest products industries are evaluated in this paper for their potential for energy production.
We have analyzed chemical composition and higher heating values of the most important industrial wood species of Serbian Fagus moesiaca, Quercus petraea, Picea abies, Pinus sylvestris and Pinus nigra.
We have determined the following contents: cellulose, Klason lignin plus acid soluble lignin, extractives in benzene, ether, alcohol, hot water and 1% NaOH and ash, by standard procedures for wood and by specially developed procedures for bark analyses.
Higher heating values obtained for examined wood samples by calorimetric bomb method ranged between 19500 and 21900 kJ/kg and for corresponding barks between 17300 and 22200 kg/kg.
The average higher heating values obtained for isolated softwood and hardwood Klason lignins were 23500 kJ/kg and 25800 kJ/kg, respectively, while the corresponding values obtained for softwood and hardwood celluloses were 16700 and 16150 kJ/kg, respectively. Correlations between the chemical composition of the forest biomass and higher heating values are proposed.
We have demonstrated in our previous research that major forest products (sawmilling, plywood and pulp production could almost completely satisfy their needs for thermal energy by combustion of their own wood residues. Amounts of residues in m3/m3 of final product range 0.280.51 for above mentioned FP industries.
For kiln drying of sawn timber 15002500 mJ/m3 of final product is required. According to our research results, available quantity of sawmilling residues in Serbia is 0.283 m3/m3 of final product.
Correspondence: Tatjana Stevanovic Janezic, Faculty of Forestry, University of Belgrade, 1130 Belgrade, Kneza Viseslava 1, Yugoslavia
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