Experimental Investigation on Evaporation of Urea-Water-Solution Droplet for SCR Applications

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The evaporation behavior of urea-water-solution (UWS) droplet was investigated for application to urea-selective catalytic reduction (SCR) systems. A number of experiments were performed with single UWS droplet suspended on the tip of a fine quartz fiber. To cover the temperature range of real-world diesel exhausts, droplet ambient temperature was regulated from 373 to 873 K using an electrical furnace. As a result of this study, UWS droplet revealed different evaporation characteristics depending on its ambient temperature. At high temperatures, it showed quite complicated behaviors such as bubble formation, distortion, and partial rupture after a linear D(2)-law period. However, as temperature decreases, these phenomena became weak and finally disappeared. Also, droplet diminishment coefficients were extracted from transient evaporation histories for various ambient temperatures, which yields a quantitative evaluation on evaporation characteristics of UWS droplet as well as provides valuable empirical data required for modeling or simulation works on urea-SCR systems. (C) 2009 American Institute of Chemical Engineers AIChE J, 55: 3267-3276, 2009
Publisher
JOHN WILEY & SONS INC
Issue Date
2009-12
Language
English
Article Type
Article
Keywords

SELECTIVE CATALYTIC-REDUCTION; NOX-REDUCTION; MULTICOMPONENT DROPLETS; ELEVATED PRESSURES; SPRAY COMBUSTION; DECOMPOSITION; TEMPERATURES; VAPORIZATION; NH3

Citation

AICHE JOURNAL, v.55, no.12, pp.3267 - 3276

ISSN
0001-1541
DOI
10.1002/aic.11939
URI
http://hdl.handle.net/10203/18947
Appears in Collection
AE-Journal Papers(저널논문)
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