A comprehensive dual-scale wood torrefaction model : application to the analysis of thermal run-away in industrial heat treatment processes

Perre, P, Remond, R, & Turner, I (2013) A comprehensive dual-scale wood torrefaction model : application to the analysis of thermal run-away in industrial heat treatment processes. International Journal of Heat and Mass Transfer, 64, pp. 838-849.

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Abstract

A dual-scale model of the torrefaction of wood was developed and used to study industrial configurations. At the local scale, the computational code solves the coupled heat and mass transfer and the thermal degradation mechanisms of the wood components. At the global scale, the two-way coupling between the boards and the stack channels is treated as an integral component of the process. This model is used to investigate the effect of the stack configuration on the heat treatment of the boards.

The simulations highlight that the exothermic reactions occurring in each single board can be accumulated along the stack. This phenomenon may result in a dramatic eterogeneity of the process and poses a serious risk of thermal runaway, which is often observed in industrial plants. The model is used to explain how thermal runaway can be lowered by increasing the airflow velocity, the sticker thickness or by gas flow reversal.

Impact and interest:

11 citations in Scopus
11 citations in Web of Science®
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ID Code: 60935
Item Type: Journal Article
Refereed: Yes
Keywords: Biomass, Mild pyrolysis, Stack, Board, Simulation, Exothermic reaction, Industrial process
DOI: 10.1016/j.ijheatmasstransfer.2013.03.066
ISSN: 00179310
Subjects: Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000) > NUMERICAL AND COMPUTATIONAL MATHEMATICS (010300) > Numerical Analysis (010301)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > INTERDISCIPLINARY ENGINEERING (091500) > Heat and Mass Transfer Operations (091505)
Divisions: Current > Schools > School of Mathematical Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: � 2013 Elsevier Ltd. All rights reserved.
Deposited On: 27 Jun 2013 03:06
Last Modified: 02 Jul 2013 03:45

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