| 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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Govin, Alexandre
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (30/30 displayed)
- 2022Effect of different retarders and their combination with superplasticizer on the properties of CSA
- 2021Effect of Citric Acid and Polycarboxylate Superplasticizers (PCE) on Hydration and Rheology of Sulfoaluminate Cement
- 2019Hydration and rheology of sulfoaluminate cements (CSA) in presence of polycarboxylate superplasticizers (PCE) and citric acid
- 2019Combination of superplasticizers with hydroxypropyl guar, effect on cement-paste propertiescitations
- 2018Hydration and rheology of sulfoaluminate-belite cements (SAC) in presence of polycarboxylate superplasticizers (PCE) and citric acid
- 2018Impact of a thin coating layer of calcium aluminate and sulfoaluminate cements on algal biofouling
- 2017Experimental study of self-heating phenomenon at the reactor-scale. Safety assessment of a fixed-bed filled with torrefied wood chips
- 2017Effect of guar gum derivatives combined with superplasticizers on properties of portland cement-pastes
- 2017Combination of guar gum derivatives and superplasticizers, impact on properties of Portland cement-pastes
- 2016Experimental study of self-heating phenomena during torrefaction of spherical wood particles
- 2016Development of treatment to prevent the algal biofouling
- 2016Modification of water retention and rheological properties of fresh state cement-based mortars by guar gum derivativescitations
- 2015Impact of Guar Gum Derivatives on Properties of Freshly-Mixed Cement-Based Mortars
- 2015Effect of the Chemical Composition of Building Materials on Algal Biofouling
- 2015Modification of fresh state properties of Portland cement-based mortars by guar gum derivatives
- 2015Effect of Guar Gum Derivatives on Fresh State Properties of Portland Cement-Based Mortars
- 2014Influence of the chemical composition of mortars on algal biofouling
- 2014Lifetime durability of bio-based composites
- 2014Development of an accelerated test of fungal biodeterioration. Application to calcium aluminate cements
- 2014Synthesis and Fluidization of Wood Powders Application to biofuel production
- 2014Influence of hydroxypropylguars on rheological behavior of cement-based mortarscitations
- 2013NMR investigations of water retention mechanism by cellulose ethers in cement-based materials
- 2012Nuclear magnetic relaxation dispersion investigations of water retention mechanism by cellulose ethers in mortarscitations
- 2010Energy requirement for fine grinding of torrefied woodcitations
- 2009Effect of cellulose ethers on water retention in freshly-mixed mortars
- 2009Effect of torrefaction on grinding energy requirement for thin wood particle production
- 2009Influence of cellulose ether particle size on water retention of freshly-mixed mortars
- 2008Water transport in freshly-mixed mortars containing cellulose ethers
- 2007Study of efflorescence forming process on cementitious materials // Etude du processus de formation des efflorescences sur des matériaux cimentaires
- 2007Structural transformations of bioactive glass 45S5next term with thermal treatmentscitations
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.