Abstract
Hydrothermal gasification of fuel pellets obtained from co-pelletized agricultural residues such as barley straw, canola hull and oat hull was performed in a batch reactor. The effects of process conditions such as temperature (300–500 °C), reaction time (20–60 min) and feed-to-water mass ratio (1:05–1:15) were investigated to optimize the gasification process for large gas yields. The maximum yield of gas was attained at the temperature, reaction time and feed-to-water mass ratio of 500 °C, 60 min and 1:10, respectively. The highest hydrogen gasification efficiency (113%), hydrogen selectivity (52%), cold gasification efficiency (41%) and heating value of gas (920 kJ/Nm3) were found for the hydrothermal gasification of canola hull pellet at the optimal conditions. The temperature was the most paramount variable followed by reaction time and feed-to-water mass ratio. Physicochemical characterization of hydrochar produced at higher gasification temperatures revealed higher carbon content, thermal stability, alkalinity and structural deformity. The liquid products obtained from hydrothermal gasification of canola hull pellets also showed the presence of partially degraded or reformed organic compounds, which can be extracted as precursors for value-added chemicals.
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