izvorni znanstveni rad
This paper reports results related to the laboratory investigation of the different samples of the pellet fuels that can be found on the Croatian pellet market (primarily mix of beech and fir, and A2 quality class). Three different pellet samples were examined in laboratory conditions and analysis was conducted in certified laboratory. General characteristics of the examined pellet fuels, as well as metal analysis of the pellet samples were reported and discussed. Gained laboratory results showed that examined pellet fuels were in accordance to the standards where net heat calorific value ranged from 17.15 MJ/kg to 17.78 MJ/kg with moisture content ranged from 3.4% to 8.2%. The ash content was elevated in the two samples in range from 16% to 25%, when compared to the maximal allowed amount by standards. One pellet sample had significantly increased amount of the aluminium when compared to the other samples for a factor 2.3 to 3.8 (increased amount was also found for iron, lead and silicon). In one sample the sulphur and ash content was found to be increased when compared with declared maximal values by pellet producer. Obtained results directed to the general importance of the more frequent quality control of the pellet fuels.
Biomass ; Pellets ; Laboratory analysis ; Renewable energy
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