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Torrefaction and low-temperature carbonization of woody biomass: Evaluation of fuel characteristics of the products

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  • Park, Sang-Woo
  • Jang, Cheol-Hyeon
  • Baek, Kyung-Ryul
  • Yang, Jae-Kyung

Abstract

Preprocessing of woody biomass was performed with torrefaction and low-temperature carbonization. In this study, the pretreated samples have been used to evaluate the energy yield and fuel characteristics. The combustion profiles of the torrefied sample and the low-temperature carbonized sample blended with coal were examined in order to analyze the characteristics of co-combustion. Energy yields of 80−98% in torrefied samples and 46−63% in low-temperature carbonized samples were observed. It was found that in the low-temperature carbonization zone, the coal band moved toward that of coal. The number of differential thermogravimetric peaks decreased from two to one with an increase in the thermal-treatment temperature. In the case of samples blended with coal and low-temperature carbonized samples at 350°C, it has been confirmed that the activation energy and all index parameters decreased as the blend ratio increased. It was confirmed that as a result, the combustion rate (dα/dt) became higher owing to an increased value of the constant (k), which represents the reaction rate. However, in the case of the sample torrefied at 275°C, it was I confirmed that the combustion rate was not the same, according to the co-combustion ratio, because of an opposite tendency shown in the devolatilization and char combustion stages.

Suggested Citation

  • Park, Sang-Woo & Jang, Cheol-Hyeon & Baek, Kyung-Ryul & Yang, Jae-Kyung, 2012. "Torrefaction and low-temperature carbonization of woody biomass: Evaluation of fuel characteristics of the products," Energy, Elsevier, vol. 45(1), pages 676-685.
    • Handle: RePEc:eee:energy:v:45:y:2012:i:1:p:676-685
    DOI: 10.1016/j.energy.2012.07.024
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    References listed on IDEAS

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    1. Park, Sang-Woo & Jang, Cheol-Hyeon, 2012. "Effects of pyrolysis temperature on changes in fuel characteristics of biomass char," Energy, Elsevier, vol. 39(1), pages 187-195.
    2. Prins, Mark J. & Ptasinski, Krzysztof J. & Janssen, Frans J.J.G., 2006. "More efficient biomass gasification via torrefaction," Energy, Elsevier, vol. 31(15), pages 3458-3470.
    3. Chen, Wei-Hsin & Hsu, Huan-Chun & Lu, Ke-Miao & Lee, Wen-Jhy & Lin, Ta-Chang, 2011. "Thermal pretreatment of wood (Lauan) block by torrefaction and its influence on the properties of the biomass," Energy, Elsevier, vol. 36(5), pages 3012-3021.
    4. Irfan, Muhammad Faisal & Arami-Niya, Arash & Chakrabarti, Mohammed Harun & Wan Daud, Wan Mohd. Ashri & Usman, Muhammad Rashid, 2012. "Kinetics of gasification of coal, biomass and their blends in air (N2/O2) and different oxy-fuel (O2/CO2) atmospheres," Energy, Elsevier, vol. 37(1), pages 665-672.
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