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Pyrolysis kinetics and multi-objective inverse modelling of cellulose at the microscale

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Title: Pyrolysis kinetics and multi-objective inverse modelling of cellulose at the microscale
Authors: Richter, F
Rein, G
Item Type: Journal Article
Abstract: The chemistry of pyrolysis, together with heat transfer, drives ignition and flame spread of biomass materials under many fire conditions, but it is poorly understood. Cellulose is the main component of biomass and is often taken as its surrogate. Its chemistry of pyrolysis is simpler and dominates the pyrolysis of biomass. Many reaction schemes with corresponding kinetic parameters can be found in the literature for the pyrolysis of cellulose, but their appropriateness for fire is unknown. This study investigated inverse modelling and the blind prediction of six reaction schemes of different complexities for isothermal and non-isothermal thermogravimetric experiments. We used multi-objective optimisation to simultaneously and separately inverse model the kinetic parameters of each reaction scheme to several experiments. Afterwards we tested these parameters with blind predictions. For the first time, we reveal a set of equally good solutions for the modelling of pyrolysis chemistry of different experiments. This set of solutions is called a Pareto front, and represents a trade-off between predictions of different experiments. It stems from the uncertainty in the experiments and in the modelling. Parameters derived from non-isothermal experiments compared well with the literature, and performed well in blind predictions of both isothermal and non-isothermal experiments. Complexity beyond the Broido-Shafizadeh scheme with seven parameters proved to be unnecessary to predict the mass loss of cellulose; hence, simple reaction schemes are most appropriate for macroscale fire models. Our results show that modellers should use simple reaction schemes to model pyrolysis in macroscale fire models.
Issue Date: 20-May-2017
Date of Acceptance: 15-Mar-2017
URI: http://hdl.handle.net/10044/1/45671
DOI: https://dx.doi.org/10.1016/j.firesaf.2017.03.082
ISSN: 1873-7226
Publisher: Elsevier
Start Page: 191
End Page: 199
Journal / Book Title: Fire Safety Journal
Volume: 91
Copyright Statement: © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Sponsor/Funder: EPSRC
Funder's Grant Number: EP/M506345/1
Keywords: 0904 Chemical Engineering
Civil Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Mechanical Engineering



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