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Title	Demonstration of Radian's Patented Hybrid Low NOx Process
Creator	Bell, Ronald D.
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1990
Spatial Coverage	presented at San Francisco, California
Abstract	Radian Corporation has successfully completed demonstration testing of its patented Hybrid Low NOx Cogeneration Process for a diesel application. The process reduces NOx to levels below 25 ppmv and CO to below 50 ppmv by utilizing an oxygen "burnout" step, a catalytic reduction step, and a catalytic oxidation step. In the reducing step, 1 to 5% excess fuel is fired in an afterburner at 2000 to 2500 F. Firing in the reducing mode results in essentially no oxygen leaving the high temperature zone of the afterburner; the CO and H2 formed here reduce NOx across the reduction catalyst. Excess CO and H2 are oxidized across the oxidation catalyst. Advantages of Radian's Hybrid Low NOx Cogeneration Process over currently available NOx reduction technologies include the following: NOx reduction to levels below 25 ppmv with destruction efficiencies of 99+% achievable; requires only fuel gas and ambient air for NOx reduction; can be readily retrofitted to conventional combustion processes; does not require ammonia or urea injection; and increases overall energy conversion efficiency because of low excess air requirements.
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/s6tt4thd
Setname	uu_afrc
ID	5838
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6tt4thd

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Title	Page 8
Format	application/pdf
OCR Text	Show is used to control the amount of O2 in the inlet to the reduction catalyst bed. Setting the CO level exiting the afterburner at 0.5 to 2.0% and then controlling engine exhaust bypass (containing approximately 10% O2 ) or make-up air injected at the inlet of the bed, such that the CO leaving the catalyst bed is maintained between 750 ppmv and 1500 ppmv, ensures that the proper CO/H2 :02:NO ratio is achieved for maximum NO reduction. This type of control is commonly used to control fuel/air ratios for boilers and other combustion equipment to achieve minimum excess air rates. In conclusion, the testing has demonstrated that Radian's patented Hybrid Low NOx Process can reduce the NOx in diesel exhaust to less than 25 ppmv with the resulting CO below 50 ppmv (both readings on a dry basis at 2% O2). In addition, the operating parameters and necessary control loops for commercial application of the process have been verified. -8-
Setname	uu_afrc
ID	5831
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6tt4thd/5831