Thermogravimetric analysis of the pyrolysis and combustion kinetics of surface dead combustibles in the Daxing’an Mountains

Shu, Yang; Zhang, Jinqi; Li, Wei; Zhao, Ping; Zhang, Qiyue; Zhou, Minghua

doi:10.1371/journal.pone.0260790

Cited by 12 publications

(1 citation statement)

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“…In studying forest fires, thermogravimetric analysis (TGA) was commonly used to investigate the thermal behavior and kinetics data of the decomposition process of vegetative fuels (Leroy et al 2006(Leroy et al , 2010. Moreover, Shu et al (2021) analyzed the combustibility and pyrolysis kinetics of forest combustibles and demonstrated their importance for fuels managing and forest fires prediction. However, few reliable experimental and modelling studies have examined the effect of different heating rate and sample sizes on the pyrolytic and combustion behavior and kinetics of forest fuels using TG-FTIR.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Characterization of Pyrolysis and Combustion of Genista Salzmannii Needles (GSN) for Fire Hazard Analysis

Rahib¹,

Leroy-Cancellieri²,

Cancellieri³

et al. 2022

Advances in Forest Fire Research 2022

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This article presents a first attempt of implementation of a lab scale methodology proposed to describe the thermal decomposition behavior of vegetative fuels, by using thermogravimetric (TG) methods, with respect to forest fire. Experiments within this method include testing the usual grinded form of samples compared to a continues fuel layer (intact form), which can render reliable and useful information to improve the understanding of the ignitability and combustibility of forest fuels along with predicting fire propagation. Moreover, slow (20 and 40 Â°C/min) and fast (60, 80 and 100 Â°C/min) heating rate were chosen to get close from the actual conditions of wildland fires (preheating/smoldering and flame region, respectively). In this work, we report the thermal decomposition behavior under inert (N2) and oxidative (air) atmospheres of Genista Salzmannii Needles (GSN) involved in fires of Mediterranean forests. TG analyses were performed to assess thermal reactivity and combustion indices (ignition, devolatilization, combustion and burnout indices) of grinded and cut GSN samples at fives heating rates of 20, 40, 60, 80 and 100 Â°C/min. The use of the set of thermal indices practical investigation, ignitability, combustibility and sustainability of forest fuels are important properties to be determined when talking to efficient wildland fire management. Moreover, Activation energy was calculated by means of two iso-conversional methods. The results showed that the cut GSN was characterized by a higher mass loss rate compared to grinded samples. As the heating rate increases, reactivity and combustion indices increase linearly. At low heating rates (20 and 40 Â°C/min), these parameters are quite similar for both samples, while the gap becomes more and more significant at elevated heating rates (60, 80 and 100 Â°C/min). High correlation coefficients (R2 > 0.96) were obtained, which indicate a good degree of fitting reliability between combustion characteristics and the tested heating rates. Furthermore, the variation of activation energy (Ea) with the conversion rate has exhibited a quite similar behavior during the whole pyrolysis and combustion process. Char formation, at the end of an intense devolatilization, was the most complex process. The oxidation of the remaining char was characterized by a significant decrease of Ea, which is not considered as a major event in the combustion process. Finally, the obtained data provide systematic knowledge for understanding the thermal decomposition of forest fuels (considered as the first stage in fire process), while the developed methodology can be used for comparison and classification of vegetative fuels related to fire risk potential.

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Section: Introductionmentioning

confidence: 99%