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Title	Effects of Mixing and Thermal Quenching on NO Reduction by Selective Non-Catalytic Reduction in the Presence of CO
Creator	Brouwer, J.; Eddings, E. G.; Heap, M. P.; Pershing, David W.; Smith, Philip J.
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1995
Spatial Coverage	presented at Monterey, California
Abstract	The effects of thermal environment (injection temperature and quench rate), reactant ratios (initial NO and NH3/NO) and reagent mixing on the selective non-catalytic reduction (SNCR) of NO by ammonia have been investigated in a pilot scale facility in the presence and absence of CO. A reduced chemical kinetic mechanism for the prediction of SNCR chemistry has been developed and incorporated into a two-dimensional, CFD-based turbulent reacting flow model for the prediction and investigation of thermal and mixing effects on the reduction process in the presence of CO. The experiments and modeling show that with rapid mixing and near isothermal conditions, very low NO emissions are achievable (around 50 ppm) independent of inlet NO levels (ranging from 250 to 500 ppm). Chemical kinetic modeling is in agreement with this finding but overpredicts the reduction efficiencies achieved in the experiment since it ignores the effects of turbulence, mixing and heat transfer. With less rapid mixing and a thermally quenched zone, NO reduction efficiencies were much lower than those predicted by homogeneous chemical kinetics. However, predictions of SNCR performance made by the fully coupled turbulent reacting flow and reduced SNCR chemical kinetic mechanism model quantitatively predict trends and magnitudes of NO reduction. The presence of CO was found experimentally and computationally to shift and narrow the temperature window for effective reduction of NO; hence, CO was found to both increase and decrease NO reduction efficiencies depending on injection temperature and quench rate.
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Format	application/pdf
Language	eng
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Scanning Technician	Cliodhna Davis
ARK	ark:/87278/s6cn76gw
Setname	uu_afrc
ID	9263
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6cn76gw

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Title	Page 10
Format	application/pdf
OCR Text	Show 11 Hunt, T. Scho~ G., Smith, R., Muzio, L.M., Jones,D.G., and Steinberger, 1.: Paper presented at the Joint EPRIfEp,A Symposium on Stationary NOx Control, Bal Harbor, Florida, 1993. 12 Teixeira, D.P., Lin, CJ., Muzio, L.M., Jones, D.G., and Okazki.: Paper presented at the Joint EPRllEPA Symposium on Stationary NOx Control, Bal Harbor, Florida, 1993. 13 Shore, D.E., Buening, HJ., Prodan, Teetz, R.D., Muzio, L.M., Quartucy, G.C., Sun,W.H., Carmignani, P.G.,Stallings, J.W.,O'Sullivan, R.C.: Paper presented at the Joint EPRllEPA Symposium on Stationary NOx Control, Bal Harbor, Florida, 1993. 14 Muzio, LJ., Montgomery, T.A., Quartucy, G.C., and Texeira, D.P., Paper presented at the Joint EPRllEPA Symposium on Stationary Combustion NOx Control, Bal Harbor, Florida, 1993. 15 Smith, PJ., and Eddings, E.G., User Guide for .JASPER I 3, Reaction Engineering International, 1993. 16 Sun, W.H., Michels, W.F., Stamatakis, P., Comparato, lR., and Hofmann, lE., AFRC Fa)) International Symposium, Cambridge, MA, 1992. 17 Sun, W.H., Hoffman, J.E., and Pachaly, R., Post Combustion NOx control with Urea: Theory and Practice, Seyenth Annual International Pittsburgh Coal Conference, 1990. 18 Miller, J.A., and Bowman, C.T., Mechanism and Modeling of Nitrogen Chemistry in Combustion, Progress in Energy and Combustion Science, vol. 15, pp. 287-338, 1989. 19 Miller, J.A., and Melius, C.F., Twenty-First Symposium (lnternatjonal) on Combustion, The Combustion Institute, Pittsburgh, pp. 919-927, 1986. 20 Dean, A.J., Hanson, R.K., and Bowman, C.T., A Shock Tube Study of Reaction of C Atoms and CH with NO Including Product Channel Measurements, Journal of physical Chemistry, vol. 95, pp. 3180-3189, 1991. 21 Lutz, A.E., Kee, RJ., and Miller, lA., SENKIN· A FORTRAN Program for Predictjng Homogeneous Gas phase Chemical Kinetics With Sensitjyjty Analysis, Sandia National Laboratories, Albuquerque NM. Sandia Report SAND87 -8248, 1987. 22 Lyon, R.K., Kinetics and Mechanism of Thermal DeNOx: A Review, I 94th Annual ACS Meeting, Diy of Fuel Chemistry, vol. 32, p. 433 fT., 1987. Page 10
Setname	uu_afrc
ID	9255
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6cn76gw/9255