Spontaneous combustion of wheat straw residue at different cooling temperatures: Combined effect of water sorption and air oxidation

Wongthonglueang Thanaphon, Rousset Patrick, Commandre Jean-Michel, Van De Steene Laurent, Valette Jérémy. 2022. Spontaneous combustion of wheat straw residue at different cooling temperatures: Combined effect of water sorption and air oxidation. Thermochimica Acta, 712:179216, 8 p.

Résumé : Self-heating and spontaneous combustion of torrefied biomass are direct hazards related to the production, storage and transport of torrefied biomass. In this study, we investigated the effect of combined air oxidation and water sorption on self-heating of torrefied agricultural residue biomass at 60, 120 and 180 °C cooling temperatures by measuring weight change and heat flow using thermogravimetric analysis and differential scanning calorimetry (TGA/DSC). Our results showed that the effect of water adsorption predominated at 60 °C. When the gas stream was changed from nitrogen to humid nitrogen, the weight of the torrefied biomass increased rapidly associated with heat generation. Conversely, at 180 °C, the effect of air oxidation predominated and the torrefied biomass decreased rapidly when it was exposed to dry air associated with heat generation. The effect of water adsorption decreased with an increase in the cooling temperature whereas the effect of air oxidation increased with an increase in temperature. The higher torrefaction severity increases the self-heating propensity. The air oxidation and water adsorption may lead to the self-heating of torrefied biomass.

Mots-clés Agrovoc : torréfaction, biomasse, propriété physicochimique, combustion, oxydation, sorption, thermodynamique

Mots-clés libres : Torrefaction, Biomass, Self-heating, Spontaneous combustion, Air oxidation, Water sorption

Classification Agris : Q60 - Traitement des produits agricoles non alimentaires

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Agences de financement hors UE : Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Auteurs et affiliations

• Wongthonglueang Thanaphon, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Rousset Patrick, CIRAD-PERSYST-UPR BioWooEB (FRA) - auteur correspondant
• Commandre Jean-Michel, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0001-9094-7879
• Van De Steene Laurent, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0003-4737-3667
• Valette Jérémy, CIRAD-PERSYST-UPR BioWooEB (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/600870/)

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