Mild pyrolytic treatment of Gmelina arborea for optimum energetic yields
2019
One of the most promising routes to produce solid biofuel from biomass
is mild pyrolytic treatment (torrefaction). In the present study, mild pyrolytic treatment of Gmelina arborea was carried out to obtain optimum energetic yields (mass
yield, higher heating value and energy yield). The biomass of 0.5–6 mm particle
sizes were torrefied at two different temperatures, 240 and 300°C for residence time
of 30 and 60 min. Full-factorial experimental method was used for the optimization
of torrefaction conditions in order to produce solid fuel with high energetic yields.
The analyses revealed that torrefied biomass was better in terms of heating value,
proximate contents and fuel ratio. The results also showed that temperature has
the largest effect on the energetic yields compared to residence time and particle
size. The optimum torrefaction conditions that produced the highest energetic
yields were temperature of 260°C, residence time of 60 min and particle size of
2 mm as predicted using the factorial linear models. The optimum conditions were
experimentally validated and the energetic yields obtained were acutely close to those predicted using factorial linear models developed in this study. Hence, mild
pyrolytic treatment at a temperature of 260°C, residence time of 60 min and particle
size of 2 mm is useful to produce solid biofuel with maximum energetic yields.
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