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Title: Soot, unburned carbon and ultrafine particle emissions from air- and oxy-coal flames
Authors: Morris, William J.
Yu, Dunxi
Wendt, Jost O. L.
Issue Date: Aug-2010
Publisher: Elsevier
Citation: Preprint: Proceedings of the Combustion Institute; http://dx.doi.org/10.1016/j.proci.2010.05.059
Type: journal article
Pages: 7
Abstract: A down-fired laboratory combustor, designed for 100 kW, was used to determine effects of switching from air to oxy-firing on soot, unburned carbon and ultrafine particle emissions from practical pulverized coal flames. Of interest here were potential effects of substitution of the N2 in air by CO2 in practical, swirling, pulverized coal, turbulent diffusion flames. The oxy-coal configuration investigated used once-through CO2, simulating cleaned flue gas recycle with all contaminants and water removed. Two coals were each burned in: (a) air, (b) 27% O2/73% CO2, and (c) 32% O2/68% CO2. Tests were conducted at (nominally) 3%, 2%, 1% and 0% O2 in the exhaust (dry basis). For each condition, particulate samples were isokinetically withdrawn far from the radiant zone, and analyzed using a photo-acoustic analyzer (PA) for “black carbon”, a scanning mobility particle sizer (SMPS) for ultrafine particles, and a total sample loss on ignition (LOI) method for unburned carbon in ash. Quantitative agreement between photo-acoustic black carbon measurements and integrated particle size distributions, measured by SMPS, suggests that at low stoichiometric ratios, ultrafine particles consist primarily of black carbon. Furthermore, for the bituminous coal, “black carbon” or soot, is produced in lesser amounts under oxy-fired conditions than under the airfired condition, even when adiabatic flame temperatures are matched. However, at 3% O2 in the exhaust, loss in ignition (LOI) of the total ash is greater under oxy-coal than under air fired conditions, and correlates only weakly with soot. Significant changes in mineral matter vaporization were not observed unless the flames were hotter. These and other results are interpreted in the light of available mechanisms.
URI: http://hdl.handle.net/123456789/10972
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