Sulfur trioxide formation during oxy-coal combustion |
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| Authors: | Jiyoung Ahn Ryan Okerlund Andrew Fry Eric G Eddings |
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| Institution: | 1. University of Utah, Department of Chemical Engineering, 50 So. Central Campus Dr., 3290 MEB, Salt Lake City, UT, 84112-9203, USA;2. Reaction Engineering International, 77 West 200 South, Suite 210, Salt Lake City, UT 84101, USA;1. Ruhr University Bochum, Faculty of Mechanical Engineering, Energy Plant Technology, Germany;2. Ruhr University Bochum, Faculty of Mechanical Engineering, Thermodynamics, Germany;3. Chemnitz University of Technology, Department of Mechanical Engineering, Applied Thermodynamics, Germany |
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| Abstract: | The purpose of this study was to investigate the effects of increased oxygen and carbon dioxide concentration on the formation of sulfur trioxide during oxy-coal combustion in two different types of pilot-scale furnaces: a pulverized-coal and a circulating-fluidized-bed-fired system.For pulverized-coal (PC) testing, concentrations of SO3 and SO2 were significantly higher for oxy-fired conditions as compared to air-fired conditions. For a high-sulfur Illinois bituminous coal, SO3 concentrations were 4–6 times greater on average. When firing a low-sulfur Utah Bituminous coal, SO3 concentrations were similar for oxy-firing vs. air-firing, and the overall levels were very low compared to the Illinois coal, consistent with differences in the fuel sulfur contents. PC-fired emissions on a normalized mass basis (mass SO3 per unit energy input) indicated higher SO3 emissions under air-fired conditions vs. oxy-firing, for both the Illinois and Utah coals.Circulating fluidized bed testing was also carried out using the low-sulfur Utah coal, and SO3 concentrations were notably higher for oxy-firing vs. air-firing, in contrast to the similar concentration levels observed for PC-firing. When compared on a normalized mass basis, the emissions were similar for both air- and oxy-firing, which is also in contrast to the PC-fired results for this coal. |
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