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Hydrothermal carbonization (HTC) is a
thermochemical conversion process, which is applied to biomass
to enhance its fuel properties. As a basis, HTC is a thermal
degradation process in the presence of water under moderate
temperature (200-280°C) and corresponding pressure. Despite
the fact that the high content of moisture is a disadvantage for
the traditional methods, it is an advantage for HTC.
This study mainly focuses on producing a fuel, a hydrochar,
which is produced from orange peel wastes from orange juice
production facilities. Due to the reason that HTC is mainly
affected from retention time and biomass/water ratio,
experiments were done at constant temperature (220°C) but at
variable retention times (1h, 3h, 5h) and biomass/water ratio
(10g /0 ml, 10 g/10 ml, 10 g/15 ml). Based on results, it is clear
that volatile content was decreased and fixed carbon percentage
was increased at all HTC applications. Moreover, HTC resulted
in hydrochars with higher calorific values. Among the results,
the best conditions, which provide lowest volatile matter (46.3%),
highest fixed carbon content (49.4%), are the retention time of 5
hours and biomass/water ratio of 10g/10ml. Based on FT-IR
results, at all HTC conditions experimented, hemicellulose
degradation was clear, due to the disappearance of 1732 cm-1
band of C=O vibration. Moreover all of the hydrochar samples
represented vibrations at 1694-1697 cm-1 denoting carboxylic
acid and their esters (COOH and -COOH3) on the surface.
As a conclusion, hydrochar samples obtained from orange peel
wastes can be regarded as good fuel candidates in terms of their
surface characteristics, volatile matter, fixed carbon content and
heating value
1.st International Conference Energy Systems Engineering
ıcese'17
Sibel Başakçılardan Kabakcı
Medya Hatun Tanış