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https://hdl.handle.net/2440/65677
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Type: | Journal article |
Title: | The release of water-bound and organic sodium from Loy Yang coal during the combustion of single particles in a flat flame |
Author: | van Eyk, P. Ashman, P. Alwahabi, Z. Nathan, G. |
Citation: | Combustion and Flame, 2011; 158(6):1181-1192 |
Publisher: | Elsevier Science Inc |
Issue Date: | 2011 |
ISSN: | 0010-2180 |
Statement of Responsibility: | Philip J. van Eyk, Peter J. Ashman, Zeyad T. Alwahabi, Graham J. Nathan |
Abstract: | The concentration of atomic sodium in the plume of single brown-coal particles burning in a flat flame environment is measured using quantitative planar laser-induced fluorescence (LIF). A run-of-mine Loy Yang brown coal (LY-ROM) and two Loy Yang brown coals (MTE1 and MTE2) that were processed using Mechanical/Thermal Expression, which removed a fraction of the inherent moisture and concomitant dissolved salts, were investigated. By applying a chemical equilibrium model, at an appropriate location in the flame, the total sodium release is estimated from the measured atomic sodium concentration profile. For LY-ROM, MTE1 and MTE2 the total proportion of sodium release following devolatilisation, as a percentage of the initial sodium in the coals, was 80.9±19.5%, 87.9±19.0% and 93.0±28.0% respectively. Using this data, it is inferred that approximately 67% of water-bound sodium and approximately 100% of the organically-bound sodium is released following devolatilisation. Furthermore, in the present experiments up to 60% of the total sodium is released during the period in which the ash remains within the flat flame, following char combustion. A mechanism is proposed to explain this observation in which Na2O in the ash reacts with ambient water vapour at high temperature. © 2010 The Combustion Institute. |
Keywords: | Coal Sodium LIF Fouling |
Rights: | © 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved. |
DOI: | 10.1016/j.combustflame.2010.10.024 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1016/j.combustflame.2010.10.024 |
Appears in Collections: | Aurora harvest Chemical Engineering publications Environment Institute Leaders publications Environment Institute publications |
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