METHOD FOR PRODUCTION OF FUEL PELLETS

摘要

The present invention relates to a method for production of fuel pellets from lignocellulosic materials, namely, grass, straw, wood, sawdust, bark and agricultural residues. According to the present invention the object of this invention is achieved by a method for obtaining fuel pellets by mixing preliminary ground lignocellulosic raw material with a binding agent with the further pelletization of obtained mixture, wood bark is used as the binding agent in the amount of 10-20.% by weight of mixture, from which biologically active compounds are extracted with the use of organic solvents. The object of the present invention is achieved by that birch outer bark is used as bark, from which lupeol and betulenol are preliminary extracted, as well as bark of white alder, from which lipophilic compounds, diarylheptanoids and condensed tannins are preliminary extracted. The use of extracted bark of alder and extracted birch outer bark as the additive for pelletization of ground straw:
Increases heating value of pellets
Increases bulk density of pellets
Decreases ash-content of pellets
Increases energy density of pellets
Increases parameters of attrition resistance of pellets
Decreases the yield of fine unpelletized biomass
Pellets on the basis of extracted bark of white alder differ from pellets on the basis of raw bark by higher heating value, higher energy density and higher attrition resistance.