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The effect of particle size, temperature and residence time on the yields and reactivity of olive stones from torrefaction

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Show simple item record Trubetskaya, Anna Grams, Jacek Leahy, James J. Johnson, Robert Gallagher, Paul Monaghan, Rory F.D. Kwapinska, Marzena 2020-07-31T11:10:40Z 2020
dc.description peer-reviewed en_US
dc.description The full text of this article will not be available in ULIR until the embargo expires on the 16/07/2022
dc.description.abstract Olive stones obtained as a by-product from olive oil extraction in combination with the favourable climate in Mediterranean countries are value-added feedstocks for the energy sector due to low moisture content ( 20 wt. %), suitable calorific value ( 18.7 MJ kg−1 as received) and high bulk density (about 750 kg m−3). The torrefaction process at Arigna Fuels with high energy efficiency of (above 90%) improves biomass properties for conversion to a high-value fuel for use in solid fuel stoves. This study reports the effect of moisture content, organic composition, inorganic matter, particle size, heat treatment temperature and residence time on product yields, O2/CO2 reactivity, calorific value, composition and thermal conductivity value of torrefied olive stones. Results showed that both lignocellulosic content and ash composition equally influenced the reactivity of torrefied material. For the first time, time-of-flight secondary ion mass spectrometry (ToF-SIMS) showed that the structure of torrefied material from small olive stone particles contains more cellulose than lignin when compared to large grains. Importantly from a technological standpoint, the lower heating values of torrefied olive stones (21.8 MJ kg−1) [1] from a small scale reactor were within the range of values for torrefied woodchip briquettes containing high starch binder content which was an energy increase of 15% when compared to the raw feedstock. The results showed that olive stones of particle size ≤ 2 mm produced during torrefaction at 270 °C for 30 min are the most suitable material and conditions for briquetting due to high solid yield, low reactivity and low thermal conductivity values. These conditions are recommended for the pilot plant operation using olive stones from the Mediterranean region. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation 16SP3829 en_US
dc.relation.ispartofseries Renewable Energy;160, pp. 998-1011
dc.rights This is the author’s version of a work that was accepted for publication in Renewable Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Renewable Energy, 2020, 160, 998-1011, en_US
dc.subject torrefaction en_US
dc.subject slow pyrolysis en_US
dc.subject olive stones en_US
dc.subject thermal conductivity en_US
dc.subject ToF-SIMS en_US
dc.title The effect of particle size, temperature and residence time on the yields and reactivity of olive stones from torrefaction en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.renene.2020.06.136
dc.contributor.sponsor SFI en_US
dc.contributor.sponsor Research Centre for Marine and Renewable Energy (MaREI) en_US
dc.contributor.sponsor Sustainable Energy and Fuel Efficiency (SEFE) en_US
dc.relation.projectid 16/SP/3829 en_US 2022-07-16
dc.embargo.terms 2022-07-16 en_US
dc.rights.accessrights info:eu-repo/semantics/embargoedAccess en_US

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