Record Display for the EPA National Library Catalog

RECORD NUMBER: 21 OF 22

OLS Field Name OLS Field Data
Main Title Reburning Thermal and Chemical Processes in a Two-Dimensional Pilot-Scale System.
Author Lanier, W. S. ; Mulholland, J. A. ; Beard, J. T. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab. ;Virginia Univ., Charlottesville. Dept. of Mechanical and Aerospace Engineering. ;Energy and Environmental Research Corp., Chapel Hill, NC. Eastern Operations Office.
Year Published 1986
Report Number EPA/600/D-86/048;
Stock Number PB86-166741
Additional Subjects Air pollution abatement ; Nitrogen oxides ; Combustion ; Natural gas ; Reaction kinetics ; Reburning
Holdings
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Status
NTIS  PB86-166741 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 26p
Abstract
The paper describes an experimental investigation of the thermal and chemical processes influencing NOx reduction by natural gas reburning in a two-dimensional pilot-scale combustion system. Reburning effectiveness for initial NOx levels of 50-500 ppm and reburn stoichiometric ratios of 0.75-1.0 is evaluated in the low temperature environment (< 1500K) and simple aerodynamics of a firetube package boiler. Both input/out and in-flame sampling trials are reported to provide insight into the controlling kinetic mechanisms. An overall reaction order between 1.5 and 1.6 was observed with respect to initial NO. N2 formation is observed to occur in both the fuel-rich reburning and fuel-lean burnout zones. NO destruction in the reburning zone is attributed to the reaction CH + NO yields HCN + O; < 1 ppm CH radical is required to produce the observed trends in nitrogenous species. Burnout zone N2 formation is influenced by total fixed nitrogen speciation with low fractional conversion of HCN and NH3. Under low primary NO conditions, the reaction CH + N2 yields HCN + N becomes important and is a contributor to reduced reburning effectiveness.