Effects of Temperature and Torrefaction Time on the Physical Characteristics of Rice Straw Pellets with Dolomite

Weeranut Intagun, Paisan Comsawang

Abstract


This research investigated the influence of torrefaction temperature and duration on the physical characteristics of biomass pellets made from rice straw mixed with dolomite. This research examined the physical characteristics, pellet density, higher heating value, and hydrophobicity of the pellets. Dolomite was added at weight percentages of 0%, 3%, 5%, and 10%. The temperature of torrefaction process was conducted at 230°C, 250°C, and 270°C for durations at 5, 10, and 15 minutes. The experimental results indicated that increasing the temperature and residence time increased both the HHV and hydrophobicity of the pellets. The results indicated that increasing both temperature and duration can significantly enhance the HHV, while the density exhibited a slight decrease. However, the pellets containing dolomite showed a decrease in HHV compared to the control samples without dolomite. Therefore, the optimum conditions were at 270°C for 15 minutes and with a dolomite addition ratio of 3%, under which the heating value of the fuel increased by up to 17.52% compared to the raw biomass.

Keywords


Dolomite; higher heating values; pellets physical properties; rice straw; torrefaction

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References


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DOI: https://doi.org/10.64289/iej.25.03A11.8937795