| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Weiss-Hortala, Elsa
IMT Mines Albi
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2023The mechanisms of calcium-catalyzed graphenization of cellulose and lignin biochars uncoveredcitations
- 2022Calcium as an innovative and effective catalyst for the synthesis of graphene-like materials from cellulosecitations
- 2022Calcium as an innovative and effective catalyst for the synthesis of graphene-like materials from cellulosecitations
- 2021Impact of Atmosphere on Recovered Carbon Fibers From Poly Ether Ether Ketone (PEEK) Based Composites During Thermoconversioncitations
- 2019Physico-chemical properties of carbon fibers recycled by steam-thermolysis of PEEK matrix composites and composite wastes mixture
- 2019Reactivity and deactivation mechanisms of pyrolysis chars from bio-waste during catalytic cracking of tarcitations
- 2019Reactivity and deactivation mechanisms of pyrolysis chars from bio-waste during catalytic cracking of tarcitations
- 2018Recovery of carbon fibres from composite waste by hydrolysis in subcritical water
- 2018Advanced characterization unravels the structure and reactivity of wood-based charscitations
- 2018Advanced characterization unravels the structure and reactivity of wood-based charscitations
- 2017Recovery of carbon fibers from composite waste by solvolysis in subcritical water using a view cell reactor
- 2017IMPACT OF SUBCRITICAL AND SUPERCRITICAL WATER ON BOTH DEPOLYMERIZATION KINETICS OF NYLON 6 AND RECYCLING CARBON FIBERS FROM WASTE COMPOSITE
- 2017Impact of Solvolysis Process on Both Depolymerization Kinetics of Nylon 6 and Recycling Carbon Fibers from Waste Compositecitations
- 2016Impact of subcritical and supercritical water on both depolymerization kinetics of nylon 6 and recycling carbon fibers from waste composite
- 2016Experimental study of self-heating phenomena during torrefaction of spherical wood particles
- 2014Hydrothermal depolymerization of carbon-based composites
Places of action
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conferencepaper
Experimental study of self-heating phenomena during torrefaction of spherical wood particles
Abstract
WasteENG : 6th International Conference on Engineering for Waste and Biomass Valorisation and 2nd WasteEng Summer School ; International audience ; Torrefaction is a thermal degradation process undertaken in the absence - or with a very low concentration - of oxygen. Generally, temperature is between 250 and 300°C and residence time from 10 to 60 minutes. It is seen as a promising pretreatment in the biomass energetic valorization scheme. Meanwhile torrefaction technology is developed at industrial scale, the market is still in development. Nevertheless, depending on process conditions, a subcritical self-heating might happen during biomass torrefaction due to the presence of exothermic reactions. Yet, this reactivity is not well understood but, as the temperature is a key parameter to control both quality and quantity of torrefied materials, this phenomenon is critical for industrial implementation and process reliability.Torrefaction experiments are carried out with spherical beech wood particles of different diameters - 2, 3, 5 and 9 cm - and at three temperatures: 250, 275 and 300°C. Five thermocouples are set in the spheres at various depths and positions to consider wood anisotropy. The experiments are conducted in an electrically heated oven. Nitrogen is used as sweeping gas. The 30 L/min stream is pre-heated before being introduced in the reactor. After torrefaction, the particles are cut in the middle and Raman analysis is carried out along the radius. A subcritical self-heating is systematically observed for the biggest particles (d≥5cm), whatever the torrefaction temperature. Raman analysis emphasizes a concentration gradient of oxygen, along fiber direction exclusively, when a self-heating has occured. This finding supports the idea that oxygenated volatile matters react with the solid materials undergoing torrefaction. The crossing point method is currently applied to determine the activation energy of the torrefaction reaction, which is a critical parameter for process modeling.