TY - JOUR
T1 - Isothermal and non-isothermal torrefaction characteristics and kinetics of microalga Scenedesmus obliquus CNW-N
AU - Chen, Wei Hsin
AU - Wu, Zih Ying
AU - Chang, Jo Shu
N1 - Funding Information:
The authors acknowledge the financial support of the Bureau of Energy, Ministry of Economic Affairs, Taiwan, ROC , under contract 102-D0613 , and the National Science Council, Taiwan, ROC , in part for this study.
PY - 2014/3
Y1 - 2014/3
N2 - Isothermal and non-isothermal torrefaction characteristics and kinetics of microalga Scenedesmus obliquus (S. obliquus) CNW-N are studied using thermogravimetric analysis. The pyrolysis of S. obliquus CNW-N with increasing temperature is characterized by four-stage decomposition. Depending on the torrefaction temperature, light, mild, and severe torrefaction from the weight loss and the maximum decomposition rate of the microalga can be classified. Under the same average temperature and torrefaction duration, non-isothermal torrefaction gives more severe pretreatment than the isothermal one. Increasing the heating rate of non-isothermal torrefaction also intensifies the pretreatment severity. Therefore, microalgae can be torrefied via non-isothermal torrefaction in a shorter time under the same pretreatment extent. The atomic H/C ratio in the microalga decreases with increasing torrefaction severity, whereas the atomic O/C ratio rises. The analysis suggests that the activation energy of isothermal torrefaction is 57.52×103Jmol-1, while it is between 40.14×103 and 88.41×103Jmol-1 for non-isothermal torrefaction.
AB - Isothermal and non-isothermal torrefaction characteristics and kinetics of microalga Scenedesmus obliquus (S. obliquus) CNW-N are studied using thermogravimetric analysis. The pyrolysis of S. obliquus CNW-N with increasing temperature is characterized by four-stage decomposition. Depending on the torrefaction temperature, light, mild, and severe torrefaction from the weight loss and the maximum decomposition rate of the microalga can be classified. Under the same average temperature and torrefaction duration, non-isothermal torrefaction gives more severe pretreatment than the isothermal one. Increasing the heating rate of non-isothermal torrefaction also intensifies the pretreatment severity. Therefore, microalgae can be torrefied via non-isothermal torrefaction in a shorter time under the same pretreatment extent. The atomic H/C ratio in the microalga decreases with increasing torrefaction severity, whereas the atomic O/C ratio rises. The analysis suggests that the activation energy of isothermal torrefaction is 57.52×103Jmol-1, while it is between 40.14×103 and 88.41×103Jmol-1 for non-isothermal torrefaction.
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U2 - 10.1016/j.biortech.2013.12.116
DO - 10.1016/j.biortech.2013.12.116
M3 - Article
C2 - 24457308
AN - SCOPUS:84892876600
SN - 0960-8524
VL - 155
SP - 245
EP - 251
JO - Bioresource technology
JF - Bioresource technology
ER -
