Journal
FUEL
Volume 185, Issue -, Pages 763-771Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2016.08.037
Keywords
Biomass components; Pyrolysis; Kinetics; Isoconversional method; DAEM
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Funding
- National Natural Science Foundation of China [51276166]
- National Basic Research Program of China [2013CB228101]
- National Science and Technology Supporting Plan Through Contract [2015BAD15B06]
- Program of Introducing Talents of Discipline to University [B08026]
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This study proposed a sequential and coupling method to determine the comprehensive kinetic models for pyrolysis of cellulose, hemicellulose and lignin. Isoconversional method was employed to find the correlation between activation energy and conversion rate. Cellulose pyrolysis could be interpreted by one-step global reaction model, while pyrolysis of hemicellulose and lignin could be divided into three stages and two stages, respectively, in which competitive parallel reactions occurred. Coats-Redfern method and Kissinger method were subsequently used to obtain the reaction model f(alpha). Particularly, a new mean reaction model f(alpha) was introduced to deal with the complex competitive parallel reactions. It was proposed that pyrolysis of cellulose followed Avrami-Erofeev (m = 2) nucleation model, while pyrolysis of hemicellulose and lignin could be described by reaction-order model. The other kinetic parameters and the contribution of each parallel reaction to devolatilization were further analyzed based on the modified distributed activation energy models. And the detailed kinetic models for pyrolysis of biomass components were finally obtained. (C) 2016 Elsevier Ltd. All rights reserved.
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