Investigation of kinetic compensation effect in lignocellulosic biomass torrefaction: Kinetic and thermodynamic analyses

Abstract

The kinetic compensation effect between the activation energy and the pre-exponential factor has extensively existed in the thermochemical conversion processes of lignocellulosic biomass. The research on the kinetic compensation effect in lignocellulosic biomass torrefaction has been insufficient yet. The torrefaction of the pinewood sample was experimentally investigated by thermogravimetric analysis (TGA) at five isothermal temperatures of 220, 250, 265, 280 and 295 °C. The reaction order model was used to analyze the isothermal torrefaction kinetics of lignocellulosic biomass, and the results showed that many sets of activation energy and pre-exponential factor could describe the experimental data at each temperature equally well and they excellently satisfied the kinetic compensation effect relationship. The linear regression lines of the kinetic compensation effect points at different temperatures intersected at one point, whose values corresponded to the obtained optimal kinetic parameters. A kinetic-compensation-effect-based method was developed and verified to determine the kinetic parameters of isothermal biomass torrefaction. Based on the optimal kinetic parameters, the thermodynamic parameters (including Gibbs free energy, enthalpy, and entropy) of biomass torrefaction processes at various temperatures were calculated and analyzed.

Publication DOI: https://doi.org/10.1016/j.energy.2020.118290
Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
Additional Information: © 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: Activation energy,Biomass torrefaction,Isothermal kinetics,Kinetic compensation effect,Thermodynamic analysis,Civil and Structural Engineering,Building and Construction,Pollution,Mechanical Engineering,Industrial and Manufacturing Engineering,Electrical and Electronic Engineering
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Related URLs: https://www.sci ... 360544220313979 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2020-09-15
Published Online Date: 2020-07-06
Accepted Date: 2020-06-30
Authors: Zhang, Zhiqing
Duan, Hanqi
Zhang, Youjun
Guo, Xiaojuan
Yu, Xi (ORCID Profile 0000-0003-3574-6032)
Zhang, Xingguang
Rahman, Md.Maksudur
Cai, Junmeng

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