Journal ArticleDOI
Modelling intra-particle phenomena of biomass pyrolysis
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TLDR
In this article, the authors developed a new model of biomass pyrolysis based on a simplified multi-step chemical decomposition with the formation of tars at liquid phase inside the particle.Abstract:
The characteristic times of the main intra particle phenomena of wood pyrolysis are discussed to develop a new model of biomass pyrolysis. The model accounts for a simplified multi-step chemical decomposition with the formation of tars at liquid phase inside the particle. The tars at liquid phase are then competitively converted into a secondary char and gases and evaporated following a Clausius–Clapeyron law. To our knowledge, a tar evaporation law had so far never been coupled with cellulose pyrolysis kinetics. The convective mass transport of all the volatile species through the porous particle is modelled by a Darcy's law. This model offers a first approach to simulate the tar (at liquid phase) life time and its intra-particle conversion. The Clausius–Clapeyron evaporation parameters are reviewed and modified if levoglucosan or cellobiosan are supposed as the main tar compounds at liquid phase. The effects of these parameters on cellulose pyrolysis mass loss rate are modelled and discussed. Mass transfer limitations can lead to a high intra-particle over-pressure and can control the life time of tar at liquid phase and the subsequent “secondary” char formation from the liquid tar conversion.read more
Citations
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One-pot fabrication of superhydrophobic and flame-retardant coatings on cotton fabrics via sol-gel reaction
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Catalytic fast pyrolysis of biomass: superior selectivity of hierarchical zeolites to aromatics
Liangyuan Jia,M. Raad,M. Raad,S. Hamieh,Joumana Toufaily,Tayssir Hamieh,Mohammed M. Bettahar,Guillain Mauviel,M. Tarrighi,Ludovic Pinard,Anthony Dufour +10 more
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TGA/MS/FT-IR study for kinetic evaluation and evolved gas analysis of a biomass/PVC co-pyrolysis process
Gamzenur Özsin,Ayşe Eren Pütün +1 more
TL;DR: In this paper, the thermal behavior of a specific biomass and a polymer sample through co-pyrolytic degradation was investigated using a combined TGA/MS/FT-IR system.
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Computational fluid dynamics modeling of biomass fast pyrolysis in a fluidized bed reactor, using a comprehensive chemistry scheme
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Journal ArticleDOI
Progress in understanding the four dominant intra-particle phenomena of lignocellulose pyrolysis: chemical reactions, heat transfer, mass transfer, and phase change
M. Brennan Pecha,Jorge Ivan Montoya Arbelaez,Manuel Garcia-Perez,Farid Chejne,Peter N. Ciesielski +4 more
TL;DR: In this paper, four principal intra-particle phenomena occur in a highly concerted manner during pyrolysis of lignocellulosic materials: heat transfer, mass transfer, chemical reactions, and phase changes.
References
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Journal ArticleDOI
Modeling chemical and physical processes of wood and biomass pyrolysis
TL;DR: In this article, the state of the art in modeling chemical and physical processes of wood and biomass pyrolysis is reported, and the main achievements of numerical simulations are discussed.
Journal ArticleDOI
Characterization of chars from pyrolysis of lignin
Ramesh K. Sharma,Jan B. Wooten,Vicki L Baliga,Xuehao Lin,W. Geoffrey Chan,Mohammad R. Hajaligol +5 more
TL;DR: The surface area of lignin char was measured by Brunauer-Emmett-Teller method and surface morphology obtained by scanning electron microscopy (SEM).
Journal ArticleDOI
A kinetic model for pyrolysis of cellulose.
TL;DR: In this article, it was shown that the pyrolysis of cellulose at low pressure (1.5 Torr) can be described by a three reaction model, where an initialization reaction leads to formation of an active cellulose which subsequently decomposes by two competitive first-order reactions, one yielding volatiles and the other char and a gaseous fraction.
Journal ArticleDOI
Chemical Kinetics of Biomass Pyrolysis
Eliseo Ranzi,Alberto Cuoci,Tiziano Faravelli,Alessio Frassoldati,G. Migliavacca,S. Pierucci,Samuele Sommariva +6 more
TL;DR: In this article, the main kinetic features of biomass pyrolysis, devolatilization, and the gas phase reactions of the released species are analyzed in a detailed manner.
Journal ArticleDOI
Modelling and experimental verification of physical and chemical processes during pyrolysis of a large biomass particle
TL;DR: In this paper, a mathematical model of wood pyrolysis is presented that is in satisfactory agreement with experimental reaction product distributions over a range of conditions of practical importance for gasification and combustion.