TGA and kinetic study of different torrefaction conditions of wood biomass under air and oxy-fuel combustion atmospheres |
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| Affiliation: | 1. Mechanical Engineering Department, Middle East Technical University, Universiteler Mahallesi, Dumlupinar Bulvari No:1, Ankara 06800, Turkey;2. Ege University, Solar Energy Institute, Bornova, İzmir, Turkey;3. Environmental Engineering Department, Middle East Technical University, Universiteler Mahallesi, Dumlupinar Bulvari No:1, Ankara 06800, Turkey;1. Laboratoire Gestion des Risques et Environnement (EA 2334), Institut de Recherche Jean-Baptiste Donnet, Université de Haute-Alsace, 3bis, rue Alfred Werner, F-68093 Mulhouse Cedex, France;2. Department of Industrial Power Engineering, Institute of Energy and Transport, Northern (Arctic) Federal University named after M.V. Lomonosov, 163002, Northern Dvina Embankment 17, Arkhangelsk, Russian Federation;1. Mechanical Engineering Department, University of Brasília, Brasília, DF 70910-900, Brazil;2. Automotive Engineering Department, University of Brasília (UnB), Brasília, Brazil;3. CIRAD, UPR BioWooEB, F-34398 Montpellier, France;4. Forest Products Laboratory, Brazilian Forest Service, 70818900 Brasília, Brazil;1. Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan;2. Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan;3. Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia;4. Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China;2. Mechanical and Industrial Engineering Department, Northeastern University, Boston, MA 02115, USA;3. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China;4. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Combustion and oxy-fuel combustion characteristics of torrefied pine wood chips were investigated by Thermogravimetric Analysis (TGA). Three torrefaction temperatures (250, 300, and 350 °C) and two residence times (15 and 30 min) were considered. Experiments were carried out at three heating rates of 10, 20, and 40 °C/min. The isoconversional kinetic methods of FWO, KAS, and Friedman were employed to estimate the activation energies. The assessment of uncertainty in obtaining the activation energy values was also considered. The obtained results indicated that due to torrefaction, the O/C and H/C atomic ratios decreased, resulting the 300ºC-30 min and 350ºC-15 min torrefied biomass to be completely embedded in lignite region in van-Krevelen's diagram. Oxy-fuel combustion affected the decomposition of cellulose and lignin components of biomass while the impact on the hemicellulose component was negligible. The kinetic analysis revealed that with the evolution of conversion degree, the activation energy values increased during hemicellulose degradation, remained approximately constant during cellulose decomposition and showed a sharp decrease for lignin decomposition. The activation energy trends were comparable in both air and oxy-fuel combustion conditions, however slight changes in activation energy values were noticed. The highest activation energy value was obtained for 250ºC-30 min torrefied biomass at 183.40 kJ/mol and the lowest value was 72.93 kJ/mol for 350ºC-15 min biomass. The uncertainty values related to FWO method were lower than KAS and Friedman methods. The uncertainty values for FWO and KAS methods were at the range of 5–15%. |
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| Keywords: | Torrefied biomass Oxy-fuel combustion Kinetics TGA |
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