Comparing four bio-reducers self-ignition propensity by applying heat-based methods derived from coal

Rousset Patrick, Mondher Bilel, Candelier Kévin, Volle Ghislaine, Dibdiakova Janka, Humbert Gilles. 2017. Comparing four bio-reducers self-ignition propensity by applying heat-based methods derived from coal. Thermochimica Acta, 655 : 13-20.

https://doi.org/10.1016/j.tca.2017.06.006

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Q2, Sujet : THERMODYNAMICS / Quartile : Q2, Sujet : CHEMISTRY, ANALYTICAL / Quartile : Q3, Sujet : CHEMISTRY, PHYSICAL

Résumé : Charcoal seems one of the most promising bio-reducer because of its high coke replacement ratio in blast furnaces. Nevertheless, biochar materials are subject self-combustion during storage, handling and transport, and need to be studied in order to understand and limit these phenomena. Heat-based methods: were employed to compare and determine the self-ignition parameters of four types of fresh biochar (Quercus pubescens, Cyclobalanopsis glauca, and Trigonostemon huangmosun, Bambusa vulgar) that are used as bio-reducers in the silica industry. This study assumed that spontaneous combustion arises from exothermic oxygen chemisorption to fresh biochar surface. Sample mass, heat flow and CO2 desorption were measured. The weight increased very rapidly as soon as the gas stream was changed from N2 to air accompanying the heat generation for each material. Desorption isotherms were found to depend on the nature of the feedstock confirming that bamboo biochar was the most reactive one under air exposure.

Mots-clés Agrovoc : charbon de bois, combustion, oxygène, réduction, température, carbonisation du bois, gazéification, Quercus pubescens, Bambusa vulgaris

Mots-clés complémentaires : Cyclobalanopsis glauca, Trigonostemon huangmosun

Mots-clés libres : Bio-reducers, Spontaneous combustion, Heat-based methods

Classification Agris : P06 - Sources d'énergie renouvelable
K50 - Technologie des produits forestiers

Champ stratégique Cirad : Axe 2 (2014-2018) - Valorisation de la biomasse

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