THERMAL SCIENCE

International Scientific Journal

INFLUENCE OF PARTICLE SIZE AND DENSITY OF PELLETED SAMPLES OF FOREST FUEL ON THERMOKINETIC CHARACTERISTICS OF PYROLYSIS AND OXIDATION

ABSTRACT
This paper presents the results of experimental studies of thermokinetic characteristics of pyrolysis and oxidation of pine needles, taking into account the influence of particle size and density of forest fuel in pelleted samples. The sample densities range within 206-955 kg/m3 (i.e. from typical sample densities to average ones for pressed pelleted samples), and the component particle sizes amount to 60-140 μm. The range of studied temperatures is 20-1000°С. The particle size and density of the material are found to be important parameters that significantly affect the kinetics of pyrolysis. According to the results of measurements, the activation energy of needles pyrolysis is within the range of 22.8-113.8 kJ/mol, and that of oxidation corresponds to 134.7-211 kJ/mol. Three intervals with significantly different values of activation energy and pre-exponential factor are distinguished in the studied temperature range. Approximation expressions are formulated for the activation energies of pyrolysis and oxidation as functions of forest fuel particle sizes, sample density and temperature.
KEYWORDS
PAPER SUBMITTED: 2020-01-24
PAPER REVISED: 2021-02-22
PAPER ACCEPTED: 2021-03-04
PUBLISHED ONLINE: 2021-04-10
DOI REFERENCE: https://doi.org/10.2298/TSCI200124134K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 6, PAGES [4695 - 4705]
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© 2023 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence