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Combustion behavior of coal pellets blended with Miscanthus biochar

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  • Li, Yueh-Heng
  • Lin, Hsien-Tsung
  • Xiao, Kai-Lin
  • Lasek, Janusz

Abstract

To achieve reductions in CO2 emissions, replacing fossil fuels with biomass in thermal power generation is becoming increasingly prevalent. In general, the fuel nature and combustion characteristics of biomass are distinct from those of fossil fuels. Biomass is typically subjected to torrefaction to improve its grindability, hydrophobicity, and heating value (HV). However, the pretreatment process is accompanied by fuel property alteration and an energy penalty. This is strongly associated with the operating envelope and combustion stability of biochar cofiring with coal. Therefore, in this study, the Taguchi method was used to calculate the optimal torrefaction parameters for maximum energy yield and HV. Thermogravimetric and fuel characteristic analyses were performed to examine the pyrolysis features and combustion behavior of the studied fuels. In addition, a blend of 50% Miscanthus biochar and 50% Australia coal was produced and pressed into pellets. The pellets were placed into a free-drop furnace to observe their combustion behavior. The results demonstrated that the ignition temperature and burnout temperature of the blended fuels could be effectively reduced, and that their fuel conversion rates and combustion characteristic index could be enhanced. The results can be applied to coal cofiring in large-scale boilers in the future.

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  • Li, Yueh-Heng & Lin, Hsien-Tsung & Xiao, Kai-Lin & Lasek, Janusz, 2018. "Combustion behavior of coal pellets blended with Miscanthus biochar," Energy, Elsevier, vol. 163(C), pages 180-190.
    • Handle: RePEc:eee:energy:v:163:y:2018:i:c:p:180-190
    DOI: 10.1016/j.energy.2018.08.117
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