ABSTRACT
The kinetics of the torrefaction process have been studied in various reactors. However, no study reported the torrefaction kinetics of organic municipal solid waste (OMSW) in a helical screw rotation-induced (HSRI) fluidized bed reactor. This study produced torrefied solid fuel, and the kinetic parameters of the OMSW torrefaction process were determined. The results showed that increasing temperature and residence time from 200 to 300°C and 0 to 40 minutes increased mass loss, calorific value, ash content, fixed carbon, energy density, and carbon content. Conversely, mass yield, volatile matter, energy yields, oxygen-to-carbon, and hydrogen-to-carbon ratios decreased. The calorific value experienced notable growth, varying from 17.80 to 26.18 MJ/kg, with increased residence time and temperature. The one-step kinetic model using a first-order reaction accurately predicts reaction data for long residence times with a maximum error of 2.42% at 300°C and 10 minutes and is useful for designing and scaling up the HSRI fluidized bed reactor within the temperature and mass loss ranges of 220–300°C and 2.61–47.38%. The OMSW torrefaction frequency factor and activation energy were 0.2036 s−1 and 24.46 kJ/mol, respectively. The findings of this study showed that residence time has less effect on the torrefaction process than temperature.
GRAPHICAL ABSTRACT
Highlights
Enhanced torrefied solid fuel (TSF) was produced successfully.
HSRI torrefaction produced high-energy-dense solid fuel (up to 26.18 MJ/kg).
Temperature has more influence on torrefied solid fuel than time.
TSF is characterized by decarbonization<dehydrogenation<deoxygenation.
Acknowledgements
This work was supported by the University of Malaya (Grant number: IIRG003A-2020FNW) and the Petroleum Technology Development Fund (PTDF).
Disclosure statement
No potential conflict of interest was reported by the author(s).
Supplementary material
Supplemental data for this article can be accessed online at https://doi.org/10.1080/15567036.2023.2283616.
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Notes on contributors
Kabir Abogunde Abdulyekeen
Kabir Abogunde Abdulyekeen conceptualization; data curation; methodology; investigation; formal analysis; validation; visualization; writing—original draft; visualization; writing—reviewing and editing.
Wan Mohd Ashri Wan Daud
Wan Mohd Ashri Wan Daud conceptualization; supervision; funding acquisition; writing—reviewing and editing.
Muhamad Fazly Abdul Patah
Muhamad Fazly Abdul Patah supervision; resources; funding acquisition.