Experimental Study of the Effect of Air Preheat Up to 1200 degree F on NOx Emissions

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Title Experimental Study of the Effect of Air Preheat Up to 1200 degree F on NOx Emissions
Creator Bojko, Rita C.; Khinkis, Mark J.; Waibel, Richard T.; Boyd, William D.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1981
Spatial Coverage Chicago, Illinois
Abstract The purpose of this study was to evaluate the environmental trade-offs associated with the use of high-temperature combustion air preheat and various NOx control methods. The overall objective of this study was to evaluate the effect of excess air and flue gas recirculation on thermal NOx emissions when burning natural gas using combustion air preheat from 650° to 1200°F. Tests were performed in IGT's pilot-scale Furnace No. 1, which was equipped with a hot air baffle burner and set up to fire a total heat input of 3 X 10 Btu/hr. The total heat input included the sensible heat of the preheated combustion air. The load on the furnace was adjusted to maintain a 2300°F flue temperature. Four different air preheat temperatures, up to seven different air/fuel ratios, and three levels of flue-gas recirculation were tested. The rates of recirculation tested were 0%, 5%, 10%, and 20%. The preheat temperatures tested were 650°, 800°, 1000°, and 1200°F. The air/fuel ratio was varied in 5% increments from ~0% to 40% excess air. The data from this study show the substantial growth of NOx formation with air preheat temperature and effectiveness of both reduced excess air and flue-gas recirculation for reducing NOx emissions, especially at high air preheat temperature. The data show the peaking of NOx formation between 6% and 7% excess oxygen in the flue.
Type Text
Format application/pdf
Language eng
Rights This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee.
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Scanning Technician Cliodhna Davis
ARK ark:/87278/s6s1851j
Setname uu_afrc
ID 1065
Reference URL https://collections.lib.utah.edu/ark:/87278/s6s1851j