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Strength, storage, and combustion characteristics of densified lignocellulosic biomass produced via torrefaction and hydrothermal carbonization

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  • Kambo, Harpreet Singh
  • Dutta, Animesh

Abstract

Lignocellulosic biomass has the potential to produce sustainable clean-green energy and other bio-based materials. However, due to the inferior physicochemical properties compared to coal, biomass is not regarded as an ideal feedstock for industrial applications. The work presented in this study evaluates the feasibility of two different thermal pre-treatments, torrefaction and hydrothermal carbonization (HTC), followed by densification. The densified and pretreated samples obtained from miscanthus feedstock were characterized in terms of the strength, storage, and combustion properties for energy applications. The results showed that both the thermal pre-treatments are promising methods for upgrading biomass. However, the HTC pellets showed considerably superior physicochemical properties when compared to the raw and torrefied pellets. The mass density (mass per unit volume) and volumetric energy density (HHV per unit volume) of the pellets produced via HTC at 260°C was significantly higher (1036kg/m3, 26.9GJ/m3) compared to raw pellets (834kg/m3, 15.7GJ/m3) and torrefied pellets (820kg/m3, 16.7GJ/m3). Moreover, the HTC pellets showed improved hydrophobicity, reduction in ash content, reduction in alkali and alkaline earth metal content, and a considerable increase in the carbon content. Based on these results, the HTC pellets have potential for the heat and power applications, including replacing coal in the existing coal-fired power plants without any significant modifications.

Suggested Citation

  • Kambo, Harpreet Singh & Dutta, Animesh, 2014. "Strength, storage, and combustion characteristics of densified lignocellulosic biomass produced via torrefaction and hydrothermal carbonization," Applied Energy, Elsevier, vol. 135(C), pages 182-191.
    • Handle: RePEc:eee:appene:v:135:y:2014:i:c:p:182-191
    DOI: 10.1016/j.apenergy.2014.08.094
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    2. Uslu, Ayla & Faaij, André P.C. & Bergman, P.C.A., 2008. "Pre-treatment technologies, and their effect on international bioenergy supply chain logistics. Techno-economic evaluation of torrefaction, fast pyrolysis and pelletisation," Energy, Elsevier, vol. 33(8), pages 1206-1223.
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