Combustion of raw and densified Tunisian oleic by-products in a fixed bed reactor

•Ashes decrease when blending olive pits and olive pomace with pine sawdust.•The combustion is more homogenous with pellets of blended olive solid wastes.•High-quality pellets are obtained by blending oleic solid wastes with woody biomass.•Combustion characteristics are enhanced with (olive pits-woo...

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Bibliographic Details
Published in:Fuel (Guildford) 2020-10, Vol.277, p.118181, Article 118181
Main Authors: Ali Mami, Mohamed, Lajili, Marzouk, Khiari, Besma, Jeguirim, Mejdi
Format: Article
Language:English
Subjects:
Ash
Biodiesel fuels
Biofuels
Blending
Carbon dioxide
Combustion
Combustion chambers
Combustion characteristics
Emissions
Engineering Sciences
Fixed bed reactor
Fixed bed reactors
Fixed beds
Freeboard
Gaseous emissions
Hardwoods
Nitrogen oxides
Nitrous oxide
Olive Residues
Pellets
Pits
Pollutants
Reactors
Sawdust
Sulfur dioxide
Temperature profiles
Wood chips
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Summary:•Ashes decrease when blending olive pits and olive pomace with pine sawdust.•The combustion is more homogenous with pellets of blended olive solid wastes.•High-quality pellets are obtained by blending oleic solid wastes with woody biomass.•Combustion characteristics are enhanced with (olive pits-woody biomass) pellets. Combustion of biofuels prepared by blending or not olive mill solid residues (olive pomace and olive pits) with pine sawdust (S) and wood chips (WC) was investigated. The mass loss, the bed temperature and the front reaction position were determined. Combustion characteristic numbers such as heating release (HR) and ignition rate (IR), mass conversion rate (MCR) and excess air coefficient (λ) were also determined. Gaseous emissions of main species (O2, CO2, CO, H2O, and Corganic were analyzed and measured in the freeboard zone of the reactor. Moreover, the NOx (N2O + NO) and SO2 emission profiles were drawn in the post-combustion chamber. All results were mainly compared to our previous works that dealt with other blends and pellets of olive wastes, but also with biofuels tested by other researchers in similar conditions. Main results exhibit a substantial decrease of the ash content when blending with pine sawdust. Temperature profiles show an increase from the ambient value to a maximum value ranging between 800 and 1075 °C in accordance with what is usually found in literature when using biomass solid biofuels. In all samples, concentrations of pollutants such as NOx were also notably reduced and were found to be acceptable regarding the European standards. Furthermore, the combustion of pellets made of 50%–50% mixture of pits and of pomace with sawdust leads to a more efficient and homogenous combustion.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2020.118181