American Flame Research Committee

Page 18

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Title Pilot Evaluation of Reburning for Cyclone Boiler NOx Control
Creator Farzan, H.; Rodgers, L.; Maringo, G.; Kokkinos, A.; Pratapas, J.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1988
Spatial Coverage presented at Pittsburgh, Pennsylvania
Abstract There are currently no commercially-demonstrated combustion modification techniques for cyclone boilers which reduce NOx emissions. The emerging reburning technology offers cyclone boiler owners a promising alternative to expensive flue gas cleanup techniques for NOx emission reduction. Reburning involves the injection of a supplemental fuel (natural gas, oil, or coal) into the main furnace in order to produce locally reducing stoichiometric conditions which convert NOx produced in the main combustion zone to molecular nitrogen, thereby reducing overall NOx emissions. This paper presents the encouraging pilot-scale results obtained using natural gas, fuel oil, and pulverized coal (PC) as reburning fuels. At a reburning zone stoichiometry of 0.9,67% NOx reduction for gas and oil reburning and 57% for coal reburning were achieved. Flue gas recirculation (FGR) was introduced at the reburning burners, and improved mixing and NOx reduction. FGR was more effective with PC reburning. Carbon monoxide (CO) emissions levels were low (less than 30 ppm) throughout the various optimum test conditions. Although the carbon content of the fly ash increased, the overall combustion efficiencies were insignificantly lower for all the reburning fuels. Furnace exit gas temperatures increased by less than 500F during reburning operation. The impact of reburning technology to full-scale cyclone boiler operation is currently under investigation.
Type Text
Format application/pdf
Language eng
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ARK ark:/87278/s64f1t84
Setname uu_afrc
ID 4946
Reference URL https://collections.lib.utah.edu/ark:/87278/s64f1t84

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Title Page 18
Format application/pdf
OCR Text Show
Setname uu_afrc
ID 4945
Reference URL https://collections.lib.utah.edu/ark:/87278/s64f1t84/4945