Agripellets from barley straw wastes have been produced in an annular die pellet mill. The semi-industrial
scale of the pilot plant allowed for measurement of the die temperature, and an accurate control of the straw
moisture at the die inlet. The pellet mechanical durability, density, length and moisture were evaluated for
pure straw and blended pellets, together with the heating value and the ash content. The composition of the
raw material barely changed with the compaction process. Optimum moisture contents for dense barley
straw pellets production proved to be in the range of 19–23%. A durability value of 95.5% was reached under
these conditions, increasing to 97–98% when small quantities of pine sawdust were added (2, 7, and 12 wt.% of
pine in straw). Agglomeration of the ground particles was improved by water and pine addition, while a
coarser grinding did not show any negative effect on barley straw compaction
Agripellets from barley straw wastes have been produced in an annular die pellet mill. The semi-industrialscale of the pilot plant allowed for measurement of the die temperature, and an accurate control of the strawmoisture at the die inlet. The pellet mechanical durability, density, length and moisture were evaluated forpure straw and blended pellets, together with the heating value and the ash content. The composition of theraw material barely changed with the compaction process. Optimum moisture contents for dense barleystraw pellets production proved to be in the range of 19–23%. A durability value of 95.5% was reached underthese conditions, increasing to 97–98% when small quantities of pine sawdust were added (2, 7, and 12 wt.% ofpine in straw). Agglomeration of the ground particles was improved by water and pine addition, while acoarser grinding did not show any negative effect on barley straw compaction
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