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Title: The effects of storage on the net calorific value of wood pellets

The wood pellet export from Canada to Europe has been increasing steadily in recent years (roughly 1.8 million ton in 2013). Due to distances involved, wood pellets remain in transit and storage for months before their final consumption. The net calorific value determines the price of wood pellet purchase in Europe. There have been concerns about the changes of net calorific values over time. In this study, the effects of storage time, storage configuration, storage temperature, and wood pellet quality on the net calorific value of wood pellets for a period of 6 months were investigated. Storage configurations were open or closed and storage temperatures were 25 °C, 35 °C and 45 °C. Two types of wood pellets used were whitewood and mixed. The results in closed storage indicated that storage time had a positive effect on the net calorific value where the net calorific value increased by 1% to 2% over the storage period. In open storage, the moisture content had the most significant impact on the net calorific value. The net calorific values of the two types of wood pellets were found to be significantly different at p < 0.001. A multivariable linear regression and analyses of variancemore » performed verified the graphical results. Lastly, the authors postulated that the higher energy potential compounds, such as aldehyde and ketone, produced during pellet storage, caused the increase in net calorific values.« less
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  1. Univ. of British Columbia, Vancouver (Canada)
  2. Pinnacle Renewable Energy Group Vancouver, Richmond, BC (Canada)
  3. Univ. of British Columbia, Vancouver (Canada); Wood Pellet Assoc. of Canada, Revelstoke (Canada)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Canadian Biosystems Engineering
Additional Journal Information:
Journal Volume: 57; Journal Issue: 1; Journal ID: ISSN 1492-9058
Canadian Society of Agricultural Engineering
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
Country of Publication:
United States
09 BIOMASS FUELS wood pellets; net calorific value; storage time