Kinetic study of oxy-combustion of plane tree ( Platanus orientalis ) seeds (PTS) in O 2 /Ar atmosphere
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Kinetic study of oxy‑combustion of plane tree (Platanus orientalis) seeds (PTS) in O2/Ar atmosphere Bojan Janković1 · Nebojša Manić2 · Vladimir Dodevski3 · Miloš Radojević2 · Dragoslava Stojiljković2 Received: 16 July 2019 / Accepted: 4 December 2019 © Akadémiai Kiadó, Budapest, Hungary 2019
Abstract The combustion reactivity of plane tree seeds biomass feedstock was studied using the thermogravimetry. The effects of atmosphere (O2/Ar) and different oxygen concentrations ( O2/Ar = 20:80% and O2/Ar = 50:50%) on the combustion characteristics were investigated. When combustion atmosphere changes from O2/Ar = 50:50% to O2/Ar = 20:80% (reducing oxygen concentrations), the burnout temperature increases by 29.50 °C for tested biomass. Obtained results demonstrate the ease 2/Ar = 20:80% ratio, and the of ignition of investigated lignocellulosic material for O 2/Ar = 50:50% ratio compared with O actual trend is maintained under the condition when the heating rate increases. The reducing of oxygen concentration strongly influenced the amount of final residue products, particularly at higher heating rates (beyond 10 °C min−1). Kinetic analysis applied to investigated process shows strongly dependencies of both the apparent activation energy (E) and pre-exponential factor (logA) with conversion (α), especially in devolatilization and combustion of volatiles reaction stages. Large variation in E is attributed to existence of multiple parallel reactions. In order to solve this problem, the deconvolution technique that uses Fraser–Suzuki function was applied. It was shown that Fraser–Suzuki function fits successfully kinetic rate curves of entire combustion process, assuming the best selected nth-order reaction model. Keywords Oxy-combustion · Plane tree seed biomass · Combustion characteristics determination · Kinetic analysis · Fraser–Suzuki deconvolution
Introduction The demand for energy is increasing and continues to contribute to a steady rise in carbon dioxide ( CO2) concentrations in the atmosphere. Energy derived from biomass combustion holds the promise of reducing net carbon dioxide Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10973-019-09154-z) contains supplementary material, which is available to authorized users. * Bojan Janković [email protected] 1
Department of Physical Chemistry, Institute of Nuclear Sciences “Vinča”, University of Belgrade, Mike Petrovića Alasa 12‑14, P.O. Box 522, Belgrade 11001, Serbia
2
Fuel and Combustion Laboratory, Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, P.O. Box 35, Belgrade 11120, Serbia
3
Laboratory for Materials Sciences, Institute of Nuclear Sciences “Vinča”, University of Belgrade, Mike Petrovića Alasa 12‑14, P.O. Box 522, Belgrade 11001, Serbia
emissions. Biomass growth by photosynthesis absorbs C O 2, so the overall process is generally considered CO2-neutral. Biomass power plants are less efficient (14.000 Btu kWh−1) [1] compared to plants operating
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