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Torréfaction et pyrolyse de peupliers utilisés en phytotechnologies : effet de la température et du contenu en chlore de la biomasse sur la distribution des métaux dans les émissions et options de valorisation

Abstract : Torrefaction (290°C) and pyrolysis (450 and 800°C) trials were performed at pilot scale on metal-enriched poplars from a phytomanaged soil and poplars from uncontaminated soil. The evolution of the end-product yield, i.e. biochar, bio-oil and gas fractions, depended on temperature rather than other parameters such as the origin or metal content of the tested poplars. Torrefaction decreased the processed poplars weight, leading to metal-enriched torrefied biomass as a major endproduct. At 450 and 800°C, metal behavior was governed by temperature. At 450°C, metals were recovered in biochar, then in bio-oil and finally in gases. At 800°C, similar results were obtained for Cu, confirming that Cu was not easily volatilized. On the contrary, Zn, Pb and Cd were mostly recovered in gases, which became the second metal recovery compartment. Zn and Pb were assumed to form volatile metal chlorides, therefore increased metal volatilization from Control poplar biomass could be explained by increased chlorine content of such biomass. According to metal concentrations, valorization options were discussed for end-products.
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https://hal-ineris.archives-ouvertes.fr/ineris-01869663
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Submitted on : Thursday, September 6, 2018 - 3:51:11 PM
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  • HAL Id : ineris-01869663, version 1

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Valérie Bert, Rodolphe Gaucher. Torréfaction et pyrolyse de peupliers utilisés en phytotechnologies : effet de la température et du contenu en chlore de la biomasse sur la distribution des métaux dans les émissions et options de valorisation. Rapport Scientifique INERIS, 2017, 2016-2017, pp.40-41. ⟨ineris-01869663⟩

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