| 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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Dirion, Jean-Louis
IMT Mines Albi
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Topics
Publications (5/5 displayed)
- 2017Experimental study of self-heating phenomenon at the reactor-scale. Safety assessment of a fixed-bed filled with torrefied wood chips
- 2017Quantification of the torrefaction effects on the grindability and the hygroscopicity of wood chipscitations
- 2016Experimental study of self-heating phenomena during torrefaction of spherical wood particles
- 2013A thorough experimental residence time distribution study in rotary kiln
- 2013A thorough experimental residence time distribution study in rotary kiln
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conferencepaper
Experimental study of self-heating phenomenon at the reactor-scale. Safety assessment of a fixed-bed filled with torrefied wood chips
Abstract
Theme: Particulate Solids - ISBN Abastract BOOK: 978-84-697-8629-1 ; International audience ; In order to circumvent the weak fuel properties of raw biomass, pretreatments are commonly applied. For example, the thermochemical process called torrefaction upgrades these weaknesses and helps the large scale development of the biomass-to-energy sector. However, the production scale up of torrefied materials rises hazard and risk issues related to self-heating. Indeed, it can lead to self-ignition if thermal runaway occurs. Self-ignition of torrefied materials has been suspected at the industrial scale and experienced in laboratories. The objective of this paper is to study the self-heating of torrefied wood in a fixed bed reactor and evaluate the influence of the torrefaction severity, the velocity and the oxygen content of the heat transfer fluid. Self-heatings without thermal runaway were generated by introducing air between 100 and 140°C at 30 NL.min -1 . When the anhydrous weight loss of torrefaction (AWL) goes form 10 to 24% the self-heating speed is more than quadrupled. At 140°C, the mildly and severely torrefied packed beds consume 30 and 150 NmL.min -1 .kg -1 of oxygen and produce 15 and 30 NmL.min -1 .kg -1 of carbon oxides, respectively. Thermal runaway occurs at 160 and 150°C for mildly and severely torrefied packed beds, respectively. During this phenomenon, the self-heating speed, the consumption of oxygen and the production of carbon oxides increase sharply.The exothermic reaction consumes more oxygen than it produces carbon oxides on a molar basis, which suggests an adsorption mechanism pathway. We bring evidence that the severity of torrefaction enhances self-heating and self-ignition propensity. We suppose that the thermal degradation of crystalline cellulose provides new available sites for oxygen adsorption and steps up the exothermic reaction rate. Surprisingly, the ratio between oxygen consumed and carbon oxides produced rises from 2 to 5 when the torrefaction severity increase. We assume that ...