Simultaneous measurement of the surface temperature and the release of atomic sodium from a burning black liquor droplet
Date
2010
Authors
Saw, W.
Nathan, G.
Ashman, P.
Alwahabi, Z.
Hupa, M.
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Journal article
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Combustion and Flame, 2010; 157(4):769-777
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Woei L. Saw, Graham J. Nathan, Peter J. Ashman, Zeyad T. Alwahabi and Mikko Hupa
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Abstract
Simultaneous measurement of the concentration of released atomic sodium, swelling, surface and internal temperature of a burning black liquor droplet under a fuel lean and rich condition has been demonstrated. Two-dimensional two-colour optical pyrometry was employed to determine the distribution of surface temperature and swelling of a burning black liquor droplet while planar laser-induced fluorescence (PLIF) was used to assess the temporal release of atomic sodium. The key findings of these studies are: (i) the concentration of atomic sodium released during the drying and devolatilisation stages was found to be correlated with the external surface area; and (ii) the insignificant presence of atomic sodium during the char consumption stage shows that sodium release is suppressed by the lower temperature and by the high CO<inf>2</inf> content in and around the particle. © 2009 The Combustion Institute.
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Copyright 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.