Torrefaction of corncob to produce charcoal under nitrogen and carbon dioxide atmospheres

[Display omitted] •Corncob was torrefied under N2 and CO2 at 220–300 °C.•Changes of physicochemical properties of charcoal were evidenced.•Burnout temperature of charcoal declined with increased torrefaction temperature.•The time for the combustion process was shorten after torrefaction.•Torrefactio...

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Bibliographic Details
Published in:Bioresource technology 2018-02, Vol.249, p.348-353
Main Authors: Li, Shu-Xian, Chen, Chang-Zhou, Li, Ming-Fei, Xiao, Xiao
Format: Article
Language:English
Subjects:
Carbon dioxide
Charcoal
Corncob
Nitrogen
Torrefaction
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Summary:[Display omitted] •Corncob was torrefied under N2 and CO2 at 220–300 °C.•Changes of physicochemical properties of charcoal were evidenced.•Burnout temperature of charcoal declined with increased torrefaction temperature.•The time for the combustion process was shorten after torrefaction.•Torrefaction at 260 °C under carbon dioxide was recommended. Corncob was torrefied under nitrogen and carbon dioxide atmospheres at 220–300 °C, obtaining solid products with mass yields of 69.38–95.03% and 67.20–94.99% and higher heating values of 16.58–24.77 MJ/kg and 16.68–24.10 MJ/kg, respectively. The changes of physicochemical properties of the charcoal was evaluated by many spectroscopies, contact angle determination, and combustion test. Hemicelluloses were not detected for the torrefaction under the hard conditions. As the severity increased, C concentration raised while H and O concentrations reduced. Combustion test showed that the burnout temperature of charcoal declined with the elevation of reaction temperature, and torrefaction at a high temperature shortened the time for the whole combustion process. Base on the data, torrefaction at 260 °C under carbon dioxide was recommended for the torrefaction of corncob.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2017.10.026