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Title	NOx Reduction by NOx Recycle Approach
Creator	Zhou, Chenn Q.; Neal, L. G.; Bolli, Rita
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1995
Spatial Coverage	presented at Monterey, California
Abstract	NOx recycle is a new approach for NOx reduction. It uses regenerable sorbent to adsorb NOx in the flue gas from a combustor followed by desorption, producing a highly concentrated NOx-laden stream containing both NO and N02. This stream is then sent back to the same combustor or to a separate combustor, where the NOx is reduced in the flame. Experimental studies have been performed to prove the concept of the NOx recycle approach. Results show that about 40% to 90% of NOx reduction efficiency can be achieved depending on experimental conditions. The NOx destruction efficiency in the combustor is affected by the recycle location, the amount of exit air and the composition of recycle gases. The most favorable recycle location is at the primary air duct. When NOx is recycled into the secondary air duct, the lower the exit 02, the better for the NOx destruction in the flame. Higher NOx reduction efficiency is obtained for the N02 recycle in comparison with the NO recycle. The concept of the NOx recycle approach has been employed in the NOXSO process, which is a dry, post-combustion flue gas treatment technology for coal-fIred boilers. The NOx recycle approach is expected to be a new alternative for NOx removal from flue gas, especially for integrated systems which use regenerable sorbent to simultaneously remove NOx, S02, and other pollutants emitted from combustion.
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.
Conversion Specifications	Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth.
Scanning Technician	Cliodhna Davis
ARK	ark:/87278/s6t72m11
Setname	uu_afrc
ID	7999
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6t72m11

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Title	Page 13
Format	application/pdf
OCR Text	Show 4). Higher NOx reduction efficiency was obtained for the N02 recycle in comparison with the NO recycle. The experimental results indicate that good mixing between recycled NOx and a reducing atmosphere and a long resident time in high temperature fuel rich zones will be favorite for the N Ox reduction. Studies on detailed mechanisms of the NOx recycle and the optimization of the NOx reduction are topics of future work. ACKNOWLEDGMENTS The support for this research from the U.S. DOE's Pittsburgh Energy Technology Center and NOXSO Corporation is gratefully appreciated. The efforts made by Cliff Eckhart and Jennifer Lyden of the B&W Research Center, who was NOXSO's subcontractor for the NOx recycle tests, are also acknowledged. REFERENCES 1. EPA Office of air and Radiation, "Summary of NOx Control Technologies and Their Availability and Extent of Application", EPA-450/3-92-004 1992. 2. A. Kokkinos, J. E. Cichanowicz, D. Eskinazi, J. Stallings, and G. Offen, "NOx Controls for Utility Boilers: Highlights of the EPRI July 1992 Workshop", Journal of Air Waste Manage. Assoc., pp.1498 - 1505, 1992 3. T . . W. Rhodes, J. R. Marks, and P. C. Siebert, "Overview of Industrial Source Control for Nitrogen Oxides", Environmental Progress, Vo1.9, NO.2, pp. 126-130, May, 1990. 13
Setname	uu_afrc
ID	7997
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6t72m11/7997