Modeling and prediction of devolatilization and elemental composition of wood during mild pyrolysis in a pilot-scale reactor

Autor: Mathieu Pétrissans, Edgar A. Silveira, Yu Ying Lin, Wei Hsin Chen, Patrick Rousset, Bo Jhih Lin, Baptiste Colin, Anélie Pétrissans, François Leconte
Přispěvatelé: National Cheng Kung University (NCKU), Laboratoire d'Etude et de Recherche sur le Matériau Bois (LERMAB), Université de Lorraine (UL), Universidade de Brasilia [Brasília] (UnB), BioWooEB (UPR BioWooEB), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Center of Excellence on Energy Technology and Environment-KMUTT, Joint Graduate School of Energy and Environment, Laboratory of Excellence ARBRE [ANR-11-LABX-0002-01], Lorraine Region Council in France, Ministry of Science and Technology [MOST 106-2923-E-006-002-MY3]
Rok vydání: 2019
Předmět:
Zdroj: Industrial Crops and Products
Industrial Crops and Products, Elsevier, 2019, 131, pp.357-370. ⟨10.1016/j.indcrop.2019.01.065⟩
ISSN: 0926-6690
DOI: 10.1016/j.indcrop.2019.01.065
Popis: International audience; Mild pyrolysis, operated at 200-300 degrees C in an inert atmosphere, is a promising technology to produce sustainable materials (i.e., heat treated woods for construction and building) and solid fuels (i.e., torrefied woods or biochars for combustion and gasification). To aid in process and reactor design, the aim of this work is to conduct thermal degradation kinetics of wood. A two-step kinetics model is developed to predict the elemental composition (C, H, and 0) and devolatilization dynamics of wood materials during heat treatment in a pilot-scale reactor by kinetic analysis. A hardwood poplar (Populus nigra) and a softwood fir (Abies pectinata) sever as feedstock, and the experiments are carried out at 200-230 degrees C with a heating rate of 0.2 degrees C min(-1) in a low-pressure environment (200 hPa). The predictions in the weight losses of the woods are in a good agreement with the experimental data. The evolutions of solids, volatiles, elements (C, H, and O), and the heating values of treated woods are further analyzed. The predictions suggest that the intermediate solid is the main product, and almost all the woods are converted when the treatment temperature is as high as 230 degrees C. The devolatilization process, which is responsible for the mass loss of wood, can be clearly identified, and the volatile liberation amounts from poplar and fir at 230 degrees C are 17.05 and 12.44 wt%, respectively. The predicted HHVs of treated woods from the empirical formula are between 19.62 and 20.55 MJ kg and the enhancement factors at the end of treatment are between 1.01 and 1.07 which is close to torrefied wood after light torrefaction. During the treatment, the extents of decarbonization, dehydrogenation, and deoxygenation in fir are all smaller than those in poplar, resulting from the lower intensity of devolatilization in the former.
Databáze: OpenAIRE
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