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Title Enhanced NOx Reduction in Staged Combustion: Technical Application of Premix Technology in Boilers
Creator Haumann, J.; Knopfli, A.; Sattelmayer, T.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1994
Spatial Coverage presented at Maui, Hawaii
Abstract This paper describes a new approach to the reduct ion of the NOx emissions of oil-fired furnaces (oil no.2 and no.6). The potential of air-staged combust ion was investigated in an experimental and theoretical research program showing a clear advantage for strong air preheat and the use of a premix burner in the first fuel-rich stage instead of a conventional diffusion burner. Using a premix burner (100kWth), the optimum emissions were less than 60% of those from the best diffusion flame in the presence of fuel bound nitrogen. Optimum residence times under substoichiometric conditions were found to be only 100-l50ms. Based on the positive results, this novel technique was developed on an industrial scale using a 2-stage-process for medium size boilers, while large scale power plant boilers will require a 3-stage combustion system. In a cooperative project between a power utility and ABB, a pilot plant of 10MWth was built and intensively tested. The influence of air preheat , oil quality, load variations, primary and secondary equivalence ratios were investigated in a parametric study. Optimum emissions of 27-47ppm (3% 02) for oil no.2 and 04-119ppm NOx for oil no.6 were measured in a load range of 3-10.5MWth while CO and UHC emissions were negligible. A residual 02 content of 0.5-1 % in the stack could be established while maintaining low levels of soot emissions. Based on these results, the potential of the large scale 3-stage process could be estimated to be <=75ppm NOx for a heavy fuel oil with 0.5%N.
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/s63n25zc
Setname uu_afrc
ID 7802
Reference URL https://collections.lib.utah.edu/ark:/87278/s63n25zc

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Title Page 13
Format application/pdf
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Setname uu_afrc
ID 7796
Reference URL https://collections.lib.utah.edu/ark:/87278/s63n25zc/7796