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Combustion pattern, characteristics, and kinetics of biomass and chars from segmented heating carbonization

Han, K; Wang, Q; Zhao, J; Luo, KH; Li, H; Chen, Y; Lu, C; (2016) Combustion pattern, characteristics, and kinetics of biomass and chars from segmented heating carbonization. Asia-Pacific Journal of Chemical Engineering , 11 (5) pp. 812-822. 10.1002/apj.2016. Green open access

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Abstract

The combustion patterns, characteristics, and kinetics were investigated by thermogravimetric analysis for raw maize straw, cotton stalk, and chars obtained from segmented heating carbonization at 300–800 °C. With increasing carbonization temperature, combustion patterns of biomass chars transform from the sequential reaction steps corresponding to pyrolysis and heterogeneous oxidation of volatiles and char to the in situ heterogeneous oxidation of fixed carbon and volatiles, the ignition temperature of biomass chars gradually increases, the ignition index does not monotonically increase, and the burnout index and combustion characteristic index decrease to different degrees. Judging from the combustion characteristic index, chars obtained from 300 to 500 °C of carbonization show better combustibility. The kinetic parameters of raw and carbonized biomass were determined by Coats–Redfern method. Different reaction mechanisms exist in oxidation processes of different chars, which attribute to the synergistic effects of homogenous oxidation of volatiles and heterogeneous oxidation of char. The kinetic parameters obtained from the variation of species and model functions exhibit kinetic compensation effect.

Type: Article
Title: Combustion pattern, characteristics, and kinetics of biomass and chars from segmented heating carbonization
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/apj.2016
Publisher version: http://dx.doi.org/10.1002/apj.2016
Language: English
Additional information: Copyright © 2016 Curtin University of Technology and John Wiley & Sons, Ltd. Curtin University is a trademark of Curtin University of Technology. This is the peer reviewed version of the following article: [Han, K. et al (2016) Combustion pattern, characteristics, and kinetics of biomass and chars from segmented heating carbonization. Asia-Pac. J. Chem. Eng., 11: 812–822. doi: 10.1002/apj.2016], which has been published in final form at http://dx.doi.org/10.1002/apj.2016. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Keywords: biomass carbonization; combustion pattern; combustion characteristics; combustion kinetics; char
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1519776
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