Modelling NOx Formation in Commercial Swirl and Low NOx Burners

Update Item Information
Title Modelling NOx Formation in Commercial Swirl and Low NOx Burners
Creator Visona, S. P.; Singh, B.; Rowland, W. L.; Stanmore, B. R.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1995
Spatial Coverage presented at Monterey, California
Abstract A wall-fired 350 MW(e) boiler firing pulverised coal was operated with low NOx burners in one portion of the furnace and standard swirl burners in the other portion. Axial in-flame measurements of temperature, oxygen and nitric oxide were obtained for the two types of 35 MW (thermal) burner at the same relative locations. Computational modeling of the burners was carried out using simplified nitrogen chemistry, with HCN and NH3 considered to be the NOx precursors. Coal moisture with associated in-flame drying of particles and subsequent ignition delay is considered. The particle trajectories, flow patterns and volatile release patterns for the two types burners were compared. In particular the influence on NOx reduction of particle penetration into the internal recirculation zone was explored. The hydrocarbon reburying effect of volatiles was investigated and found to have particular relevance to the low NOx burner. Overall the predictions of NO concentrations are in good agreement with the measurements, and it is concluded that simplified NOx chemistry has been successfully applied to both high and low NOx pf coal flames.
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/s6542r5j
Setname uu_afrc
ID 9142
Reference URL