Skip to main content

Research Repository

Advanced Search

Optimisation of biomass milling for conveyance and combustion

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


Professor of Mechanical Engineering

Norman Byrne


Agricultural wastes are increasingly being used as biomass materials for co-firing in coal fired power stations. However issues in milling and conveyance of agricultural residues are limiting the use of these resources and a greater understanding of their milling and conveyance behaviours is required to overcome the issues being seen in industry. The batch milling process of a planetary ball mill can be used to simulate various conditions within a continuous flow ball mill, which allows for the analysis of the different of mill variables, and identify the optimal milling conditions within the mill for different biomasses. For this study, as received olive cake was milled in a laboratory scale planetary ball mill for a range of mill variables in order to ascertain the impact of these variables on milling behavior. The variables investigated were volume (100-200ml), mill rotational speed (200-600 RPM), and energy inputs/time (0.1 kJ-8 kJ). During the milling process caking was observed for all speeds and volumes, especially for long milling periods and was more pronounced for higher speeds. Dusting was observed for high volumes at low speeds for prolonged milling durations. The impact of overloading the mill can be seen by the increased energy requirements and milling times; low speeds result in incomplete milling and dusting, and high speeds result in extreme caking in short time periods.


Williams, O., Eastwick, C., Lester, E., Giddings, D., & Byrne, N. (2013). Optimisation of biomass milling for conveyance and combustion

Conference Name 21st European Biomass Conference and Exhibition
End Date Jun 7, 2013
Acceptance Date Feb 1, 2013
Online Publication Date Jun 3, 2013
Publication Date Jun 3, 2013
Deposit Date Jan 10, 2017
Peer Reviewed Not Peer Reviewed
Keywords olive cake, milling, grindability, comminution, particle size distribution
Public URL
Publisher URL
Copyright Statement Copyright information regarding this work can be found at the following address:
Additional Information Published in: European Biomass Conference and Exhibition Proceedings. ISBN 9788889407530. p. 1164-1166. doi:10.5071/21stEUBCE2013-2DV.3.41.