Record Display for the EPA National Library Catalog


Main Title Mechanisms of Nitrous Oxide Formation in Coal Flames.
Author Kramlich, J. C. ; Cole, J. A. ; McCarthy, J. M. ; Lanier, W. S. ;
CORP Author Energy and Environmental Research Corp., Irvine, CA.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher c1989
Year Published 1989
Report Number EPA-68-02-4247; EPA/600/J-89/079;
Stock Number PB90-103805
Additional Subjects Air pollution control ; Nitrogen oxide(N2O) ; Flames ; Reaction kinetics ; Mathematical models ; Experimental design ; Combustion products ; Coal ; Carbon monoxide ; Electric power plants ; Reprints ; Chemical reaction mechanisms ; Homogeneous reactions ; Stationary sources
Library Call Number Additional Info Location Last
NTIS  PB90-103805 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
The paper gives results of a study which investigated an unknown mechanism by which N2O is formed in coal flames, using both detailed kinetic modeling and plug-flow simulator experiments. The mechanism has considerable importance in determining the influence of common and advanced NOx control strategies on N2O. Significant N2O emissions have been observed from coal and oil burning power plants but not from industrial gas flames, even when they are doped with an equivalent amount of fuel nitrogen. Kinetic modeling suggests that net N20 is unlikely to form within flame zones because of its rapid removal by: N2O + H yields N2 + OH. Also, reduction of NO on coal char, or coal char oxidation, can be significant N2O sources only if the rates are many times their published values. However, both kinetic modeling and experiments show that, if HCN appears in the gas phase between 1150 and 1500 K, it will be partially converted to N2O. The source of HCN may be either direct devolatilization or a char gasification reaction. This suggests that the N2O which appears in coal flames may originate from the homogeneous reaction of devolatilized char nitrogen in the fuel-lean post-flame region. The kinetics indicate that the formation is principally through the reaction: NCO + NO yields N2O + CO.