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The impact of moisture on the milling behavior of different biomasses

Williams, Orla; Eastwick, Carol; Lester, Edward; Giddings, Donald; Byrne, Norman


Professor of Mechanical Engineering

Norman Byrne


The aim of this study was to examine the impact of moisture content on the milling behaviour of four different biomasses commonly used in the power sector and characterise their milling behaviour in a laboratory scale planetary ball mill. As received (raw) and dried wood pellets, eucalyptus pellets, olive pellets, and Spanish olive cake were milled for the same milling conditions, and then characterised by energy consumption, particle size, and thermal characterisation. The study found that dry samples have higher energy consumption than raw samples in a laboratory scale planetary ball mill. Drying had varying impacts on the particle size distributions of the samples, with olive cake showing a 60% reduction in mean geometric diameter, while wood and eucalyptus pellets only showed a 15% and 18% reduction respectively. Moisture acts an inhibitor to milling performance, and increased moisture makes biomass more impact resistant, thus reducing ball momentum and resulting in lower energy consumption in the mill.

Publication Date Jun 23, 2014
Peer Reviewed Not Peer Reviewed
APA6 Citation Williams, O., Eastwick, C., Lester, E., Giddings, D., & Byrne, N. (2014). The impact of moisture on the milling behavior of different biomasses
Keywords drying, eucalyptus, moisture, wood pellet, olive tree, comminution
Publisher URL
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Published in: European Biomass Conference and Exhibition Proceedings. ISBN 9788889407523. p. 467-471. doi: 10.5071/22ndEUBCE2014-2CO.1.1