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Combustion pattern, characteristics, and kinetics of biomass and chars from segmented heating carbonization
Author(s) -
Han Kuihua,
Wang Qian,
Zhao Jianli,
Luo K. H.,
Li Hui,
Chen Yang,
Lu Chunmei
Publication year - 2016
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2016
Subject(s) - char , carbonization , combustibility , combustion , thermogravimetric analysis , pyrolysis , biomass (ecology) , chemical engineering , autoignition temperature , carbon fibers , ignition system , kinetics , biochar , materials science , chemistry , organic chemistry , thermodynamics , composite material , composite number , oceanography , physics , quantum mechanics , engineering , geology , adsorption
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. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.