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Open AccessArticle

Oxytree Pruned Biomass Torrefaction: Process Kinetics

1
Faculty of Life Sciences and Technology, Institute of Agricultural Engineering, Wrocław University of Environmental and Life Sciences, 37/41 Chełmońskiego Str., 51-630 Wrocław, Poland
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Faculty of Life Sciences and Technology, Institute of Agroecology and Plant Production, Wrocław University of Environmental and Life Sciences, 24A Grunwaldzki Sqr., 53-363 Wrocław, Poland
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Faculty of Life Sciences and Technology, Department of Horticulture, Wrocław University of Environmental and Life Sciences, 24A Grunwaldzki Sq., 53-363 Wrocław, Poland
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Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, IA 50011, USA
*
Author to whom correspondence should be addressed.
Materials 2019, 12(20), 3334; https://doi.org/10.3390/ma12203334
Received: 27 August 2019 / Revised: 4 October 2019 / Accepted: 9 October 2019 / Published: 12 October 2019
(This article belongs to the Special Issue Advances in Carbonized Refuse-Derived Fuel)
Oxytree is a fast-growing energy crop with C4 photosynthesis. In this research, for the first time, the torrefaction kinetic parameters of pruned Oxytree biomass (Paulownia clon in Vitro 112) were determined. The influence of the Oxytree cultivation method and soil class on the kinetic parameters of the torrefaction was also investigated. Oxytree pruned biomass from a first-year plantation was subjected to torrefaction within temperature range from 200 to 300 °C and under anaerobic conditions in the laboratory-scale batch reactor. The mass loss was measured continuously during the process. The relative mass loss increased from 1.22% to 19.56% with the increase of the process temperature. The first-order constant rate reaction (k) values increased from 1.26 × 10−5 s−1 to 7.69 × 10−5 s−1 with the increase in temperature. The average activation energy for the pruned biomass of Oxytree torrefaction was 36.5 kJ∙mol−1. Statistical analysis showed no significant (p < 0.05) effect of the Oxytree cultivation method and soil class on the k value. The results of this research could be useful for the valorization of energy crops such as Oxytree and optimization of waste-to-carbon and waste-to-energy processes.
Keywords: Oxytree; Paulownia; torrefied biomass; pruned biomass; valorization; renewable energy; fast-growing biomass; energy crops; brownfields; kinetics parameters; activation energy Oxytree; Paulownia; torrefied biomass; pruned biomass; valorization; renewable energy; fast-growing biomass; energy crops; brownfields; kinetics parameters; activation energy
MDPI and ACS Style

Świechowski, K.; Stegenta-Dąbrowska, S.; Liszewski, M.; Bąbelewski, P.; Koziel, J.A.; Białowiec, A. Oxytree Pruned Biomass Torrefaction: Process Kinetics. Materials 2019, 12, 3334.

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