Investigation of kinetic compensation effect in lignocellulosic biomass torrefaction: kinetic and thermodynamic analyses
Investigation of kinetic compensation effect in lignocellulosic biomass torrefaction: kinetic and thermodynamic analyses
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.
Activation energy, Biomass torrefaction, Isothermal kinetics, Kinetic compensation effect, Thermodynamic analysis
Zhang, Zhiqing
963953a8-b4ca-47f4-b19a-7d35d29e11e0
Duan, Hanqi
c739e595-ffcc-49f7-82e3-40c0a2b58237
Zhang, Youjun
d1525e54-4267-4069-9c7e-cea75909dda7
Guo, Xiaojuan
1c550b1c-5221-4ebd-9a8b-49585ba22012
Yu, Xi
7e4f553f-cc11-4c6e-ad6d-9fb5c3c07a60
Zhang, Xingguang
98a45d36-518b-4f6f-ac05-b47b277ddc10
Rahman, Md Maksudur
e18e7868-17cf-45f3-aa90-c5b96707debe
Cai, Junmeng
9e5ac5c2-f617-4571-a0f5-687670340568
13 July 2020
Zhang, Zhiqing
963953a8-b4ca-47f4-b19a-7d35d29e11e0
Duan, Hanqi
c739e595-ffcc-49f7-82e3-40c0a2b58237
Zhang, Youjun
d1525e54-4267-4069-9c7e-cea75909dda7
Guo, Xiaojuan
1c550b1c-5221-4ebd-9a8b-49585ba22012
Yu, Xi
7e4f553f-cc11-4c6e-ad6d-9fb5c3c07a60
Zhang, Xingguang
98a45d36-518b-4f6f-ac05-b47b277ddc10
Rahman, Md Maksudur
e18e7868-17cf-45f3-aa90-c5b96707debe
Cai, Junmeng
9e5ac5c2-f617-4571-a0f5-687670340568
Zhang, Zhiqing, Duan, Hanqi, Zhang, Youjun, Guo, Xiaojuan, Yu, Xi, Zhang, Xingguang, Rahman, Md Maksudur and Cai, Junmeng
(2020)
Investigation of kinetic compensation effect in lignocellulosic biomass torrefaction: kinetic and thermodynamic analyses.
Energy, 207, [118290].
(doi:10.1016/j.energy.2020.118290).
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.
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More information
Accepted/In Press date: 30 June 2020
e-pub ahead of print date: 6 July 2020
Published date: 13 July 2020
Additional Information:
Funding Information:
Financial support from CAS Key Laboratory of Renewable Energy, China (Project No. Y807k91001 ) is greatly acknowledged. Mr. Laipeng Luo, a junior student from School of Agriculture and Biology, Shanghai Jiao Tong University, P. R. China, is greatly acknowledged for his help in thermodynamic calculation.
Funding Information:
Financial support from CAS Key Laboratory of Renewable Energy, China (Project No. Y807k91001) is greatly acknowledged. Mr. Laipeng Luo, a junior student from School of Agriculture and Biology, Shanghai Jiao Tong University, P. R. China, is greatly acknowledged for his help in thermodynamic calculation.
Keywords:
Activation energy, Biomass torrefaction, Isothermal kinetics, Kinetic compensation effect, Thermodynamic analysis
Identifiers
Local EPrints ID: 481856
URI: http://eprints.soton.ac.uk/id/eprint/481856
ISSN: 0360-5442
PURE UUID: 8aae5d77-96c8-4298-8ca0-64bb898cbaa0
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Date deposited: 11 Sep 2023 17:02
Last modified: 06 Jun 2024 02:19
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Contributors
Author:
Zhiqing Zhang
Author:
Hanqi Duan
Author:
Youjun Zhang
Author:
Xiaojuan Guo
Author:
Xi Yu
Author:
Xingguang Zhang
Author:
Md Maksudur Rahman
Author:
Junmeng Cai
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