On-farm storage of baled and pelletized canola (Brassica napus L.) straw: Variations in the combustion related properties

Brassica napus L. (canola/oilseed rape) straw presents a suitable alternative combustion fuel due to its availability, relatively high calorific value and low moisture content. Pelletization enabled the bulk density of canola straw to be improved, enhancing its potential as an alternative combustion fuel. The aim of the paper was to determine the effect of on-farm storage on the gross calorific value, ash content, volatile content and elemental composition of canola straw bales (stored for up to 20 months) and pellets (stored for up to 12 months). Statistically significant changes occurred to the elemental composition of straw bales and pellets during on-farm storage, but these changes were not of practical significance in terms of the materials suitability as a combustion fuel.

► Significant changes in GCV, ash and volatile content and elemental composition.
► Variations weren't of practical significance and attributed to natural variations.
► Sulphur, magnesium, aluminium, calcium, and iron content increased with storage.
► Carbon, sulphur and chlorine content lower in the pellets than baled straw.