Characterization of PAHs Trapped in the Soot from the Combustion of Various Mediterranean Species

Climate change causes more frequent and destructive wildfires even transforming them into megafire. Moreover, all biomass fires produce emissions of carbon compounds in the form of soot to the atmosphere with a significant impact on the environment and human health. Indeed, the soot is causing the formation of PAHs from (a) the high temperature thermal alteration of natural product precursors in the source organic matter and (b) the recombination of molecular fragments in the smoke. However, these molecules are known to have carcinogenic effects on human health. It is therefore interesting to quantify the 16 PAHs concentration extracted from soot emitted in open diffusion flame of biomass combustion. To achieve this objective, an analytical method developed for the study of kerosene combustion has been adapted for soot from biomass. This new method allowed to quantify the 16 PAHs defined as priority pollutants by the US EPA for their carcinogenic mutagenic effect and on human health

Multi-scale kinetic model for forest fuel degradation

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A global mechanism for the thermal degradation of peat

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Kinetics of the Thermal Degradation of vegetation fuels: thermogravimetric and calorimetric analysis

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A Kinetic Study of The Thermal Degradation of Ligno-cellulosic

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Relation between forest fuels composition and energy emitted during their thermal degradation

International audienceIn this work, calorimetric experiments were performed in order to study the thermal oxidative degradation of rockrose, heather, strawberry tree and pine. Firstly, lignin, holocellulose and cellulose were extracted from the fuels and their contents were calculated according to normalized chemical methods. Then, Differential Scanning Calorimetry was used under air sweeping with dynamic mode on the temperature range [400 - 900 K] in order to obtain reaction enthalpy. Finally, a simple enthalpy model was developed based on the enthalpy of the thermal degradation of each biopolymer with their respective proportions in the fuels. The results showed that the model agreed satisfactorily to experimental data

Thermal degradation of ligno-cellulosic fuels: DSC and TGA studies

International audienceThe scope of this work was to show the utility of thermal analysis and calorimetric experiments to study the thermal oxidative degradation of Mediterranean scrubs. We investigated the thermal degradation of four species; DSC and TGA were used under air sweeping to record oxidative reactions in dynamic conditions. Heat released and mass loss are important data to be measured for wildland fires modelling purpose and fire hazard studies on ligno-cellulosic fuels. Around 638 and 778 K, two dominating and overlapped exothermic peaks were recorded in DSC and individualized using a experimental and numerical separation. This stage allowed obtaining the enthalpy variation of each exothermic phenomenon. As an application, we propose to classify the fuels according to the heat released and the rate constant of each reaction. TGA experiments showed under air two successive mass loss around 638 and 778 K. Both techniques are useful in order to measure ignitability, combustibility and sustainability of forest fuels

Multi-scale modeling of the thermal degradation of woods

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Analyse chimique et thermique de combustibles ligno-cellulosiques

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