Influence of droplet size on the release of atomic sodium from a burning black liquor droplet in a flat flame
Date
2010
Authors
Saw, W.
Nathan, G.
Ashman, P.
Hupa, M.
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Journal article
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Fuel: the science and technology of fuel and energy, 2010; 89(8):1840-1848
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W.L. Saw, G.J. Nathan, P.J. Ashman, M. Hupa
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Abstract
The influence of initial droplet size on the release of atomic sodium from black liquor solids (BLS) during each stage of black liquor combustion has been assessed using a planar laser-induced fluorescence (PLIF) technique. Three different initial diameters of black liquor droplets, 1.3, 1.7 and 2.2 mm were burned in a flat flame at equivalence ratios of 0.8, 0.9 and 1.25. The temporal release of the atomic sodium under fuel rich conditions was found to be different from that under fuel-lean conditions, especially during the smelt coalescence stage. For each stage of black liquor combustion, the measured release rate of atomic sodium increases with decreasing d<inf>i</inf>. This implies that significant release of atomic sodium could occur during the in-flight combustion of small droplets, which are known to be generated in recovery boilers from either the carryover or the ejecta. © 2010 Elsevier Ltd. All rights reserved.
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Copyright © 2010 Elsevier Ltd. All rights reserved.