Variability of Normative Properties of Wood Chips and Implications to Quality Control

The research was conducted with the goal to determine variability of quality parameters wood chips produced from most favorable raw material (energy roundwood), and in controllable operational conditions (pellet factory), as first step identifying opportunities optimize chips’ monitoring. Four types were tested: fir/spruce beech debarked energy roundwood, well bark same species. Sampling during six consecutive months along laboratory testing, all according HRN EN ISO standards for solid biofuels. Interpretation results done relation deviation sampling (as an indicator possibility retain chips), repeatability reproducibility set acceptable variability). influence species debarking process on analyzed well. Relative class change pointed moisture content a normative property lowest initial values over six-month period. Ash indicated strong maintain ash majority samples. In just three cases, outside limits reference. Gross calorific value only four samples are Wood influenced gross median particle size distribution showed significant positive effect reduction reduction. Presented findings indicative investigated materials, however general conclusion subject properties variation, various will have be examined further research.