Abstract

This study investigates the impact of biomass moisture content, press-channel length, energy input, and die temperature on pellet quality in pilot-scale flat-die pellet production. In addition, observed correlations between pellet quality and the chemical composition of the pelletized biomass assortments are presented. Ten different feedstock assortments: Scots pine bark, Scots pine forest residues, willow, poplar stemwood with bark, beech stemwood with bark, wheat straw, reed canary grass, corn cobs, sunflower shells, and grape seed cakes were pelletized in a flat-die pilot-scale pelletizer with a die-channel diameter of 6 mm. The die-channel length varied within a range of 18–60 mm and biomass moisture content from 10% to 23%. In all, 72 pelletizing experiments were performed.

Biomass moisture content was the most important parameter for mechanical durability. The feedstock moisture content required to obtain maximum pellet durability depended on the feedstock and showed correlations with its extractives and galactose content. For all feedstocks, bulk density correlated negatively with moisture content. The mechanical durability and bulk density of pellets increased with energy consumption. Energy consumption increased with press-channel length and was correlated with acetyl-group content.

Keywords

pelletizing; wood pellet; straw; bark; Galactose Acetyl groups

Published in

Fuel
2021, Volume: 302, article number: 121076

SLU Authors

• Larsson, Sylvia

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

Sustainable Development Goals

SDG7 Ensure access to affordable, reliable, sustainable and modern energy for all
SDG9 Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation


UKÄ Subject classification

Tribology
Applied Mechanics
Energy Engineering


Publication identifier

DOI: https://doi.org/10.1016/j.fuel.2021.121076

Permanent link to this page (URI)

https://res.slu.se/id/publ/112272