Journal
RSC ADVANCES
Volume 8, Issue 41, Pages 22909-22916Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra02618a
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Funding
- National Key R&D Program of China [2017YFB0602002]
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In this paper, the combustion reaction kinetics of pyrolysis char of low-rank coal is studied by thermal analysis technology. For the combustion process of the char at different heating rates, the reaction kinetic parameters were calculated by three common mode-free methods (FWO method, KAS method and Starink method); the reaction model was determined by Malek method and Popescu method. Research shows that activation energy E of char combustion calculated by the three methods was 110.66-70.31 kJ mol(-1), 104.35-59.60 kJ mol(-1) and 104.34-59.99 kJ mol(-1), respectively, and the activation energy decreased with increasing conversion rates. There is a compensation effect between the activation energy and pre-exponential factor of char combustion. Results of the kinetic analysis by Malek method and Popescu method both indicated that the Avrami-Erofeev equation (n = 3/2) (f() = 3/2(1 - )[-ln(1 - )](1/3)) controlled by nucleation and nuclei growth models is the most probable reaction model of char combustion.
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