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

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

Energy, 2012, vol. 45, issue 1, 676-685

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.

Keywords: Woody biomass; Thermal treatment; Torrefaction; Carbonization; Combustion characteristics (search for similar items in EconPapers)
Date: 2012
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Citations: View citations in EconPapers (42)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:45:y:2012:i:1:p:676-685

DOI: 10.1016/j.energy.2012.07.024

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