Journal article
Torrefaction and low-temperature carbonization of woody biomass: Evaluation of fuel characteristics of the products
Department of Environmental Engineering, Hanbat National University, San 16-1 Duckmyung-dong Yusung-gu, Daejeon 305-719, Republic of Korea1
Department of Environmental Engineering & Health Science, Cheongyang Provincial College, Cheongyang, Chungnam 345-702, Republic of Korea2
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.
Language: | English |
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Year: | 2012 |
Pages: | 676-685 |
ISSN: | 18736785 and 03605442 |
Types: | Journal article |
DOI: | 10.1016/j.energy.2012.07.024 |