Evaluation of structural features of chars from pyrolysis of biomass of different particle sizes |
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Authors: | Mohammad Asadullah Chun-Zhu Li |
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Affiliation: | a Department of Chemical Engineering, Monash University, Clayton Campus, VIC 3800, Australia b Curtin Centre for Advanced Energy Science and Engineering, Curtin University of Technology, 1 Turner Avenue, Technology Park, WA 6102, Australia |
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Abstract: | The structural features of chars derived from pyrolysis of mallee wood of different particle sizes in a novel fluidized-bed/fixed-bed reactor have been investigated. Raman spectroscopy was used for structural evaluation of chars. Spectra were curve-fitted with 10 Gaussian bands representing typical structural features of the chars. The temperature had a significant influence on the evolution of char structure and thus the total Raman peak area between 800 and 1800 cm− 1 is seen to decrease significantly with increasing pyrolysis temperature for all chars. On the other hand, the ratio ID/I(Gr + Vl + Vr) between the band intensities of condensed aromatic ring systems (> 6 rings) and amorphous char structures with small aromatic ring (3-5 rings) systems is seen to increase with increasing temperature. The particle size of biomass has a great role in char structure at fast heating rate (> 1000 °C/s) pyrolysis although it has no effect on char structure at slow heating rate pyrolysis (0.17 °C/s). However, in the bigger biomass particle, the structure of char prepared under fast heating rate pyrolysis is similar to that of the structure of char prepared under slow heating rate pyrolysis. |
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Keywords: | Pyrolysis Gasification Char structure Fluidized-bed/fixed-bed reactor |
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