Overcoming the caking phenomenon in olive mill wastes

Williams, Orla and Eastwick, Carol and Kingman, S.W. and Giddings, Donald and Lester, Edward (2017) Overcoming the caking phenomenon in olive mill wastes. Industrial Crops and Products, 101 . pp. 92-102. ISSN 0926-6690

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Abstract

The use of olive mill wastes (orujillo) within coal fired power stations in the UK has led to unexpected difficulties with material caking within the fuel handling plant. This study replicated orujillo caking on a laboratory scale using a planetary ball mill and explored the impact of mill parameters (speed, volume, and duration) on the caking phenomenon. The impact of orujillo composition was examined for 4 sections of fresh and dried orujillo (whole, pulp 0–850 μm, pulp 850–3350 μm, and cluster 3350 μm+) for set milling conditions. Caking was induced by heat generation within the mill and was most prevalent in the pulp section of orujillo. Caking was brought on by a glass transition step, which was measured to be around 97–98 °C for a moisture content of 6–7% in a differential scanning calorimeter (DSC). Caking was the result of the bulk moisture content (14–18%) being higher than the standard moisture content of orujillo (<12%), and can be mitigated through drying. Thus the key to overcoming orujillo caking in fuel handling plants is through moisture content control. Additionally, as the caking issue is most prevalent in the pulp section, all fines below the required combustion particle size (typically <1 mm) should be removed prior to comminution and sent directly to the burner. This would also reduce the comminution load by nearly 50%, increase the energy potential of the fuel, and remove the most problematic section of orujillo from the fuel handling plant.

Item Type: Article
Keywords: Orujillo; Olives; Caking; Comminution; Differential scanning calorimetry; Glass transition step
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Chemical and Environmental Engineering
Identification Number: 10.1016/j.indcrop.2017.02.036
Depositing User: Williams, Orla
Date Deposited: 03 Apr 2017 12:24
Last Modified: 03 Apr 2017 12:31
URI: http://eprints.nottingham.ac.uk/id/eprint/41709

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