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Title	Experimental Study on NOx and N20 Emissions from a CFB Combustor
Creator	Wang, X. S.; Akhtar, N. A.; Gibbs, B. M.
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1994
Spatial Coverage	presented at Maui, Hawaii
Abstract	The possibilities of controlling NOx and N20 emissions from a circulating fluidized-bed (CFB) combustor were investigated. It was found that the NOx emission increased whilst the N20 emission decreased with increasing temperature. Both NOx and N20 emissions were found to increase with increasing excess air factor. Compared to unstaged combustion, the staged combustion appeared to be more effective in controlling the NOx emission. The effect of air staging on the N20 emission was, however, found to be small. In order to minimise NOx and N20 emissions from a CFB combustor, the emission of NOx and N20 needs to be controlled in stages.
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/s66t0q8x
Setname	uu_afrc
ID	9951
Reference URL	https://collections.lib.utah.edu/ark:/87278/s66t0q8x

Title	Page 2
Format	application/pdf
OCR Text	Show combustor. Strategies for controlling NOx and N20 emissions from the CFB are discussed based on the experimental results. EXPERIMENTAL A schematic of the CFB combustor used in this investigation is shown in Fig. 1. It consisted of a O.161-m id and 6.2-m tall riser, primary and secondary cyclones, an external heat exchanger (ERE) and a solids return valve (i.e. Lvalve). Silica sand having a mean diameter of 120 J.1II1 and a density of 2500 kglm3 was used as the main circulating material. A Dawmill bituminous coal was used as the fuel. Ultimate and proximate analyses of the coal are given in Table 1. Primary air was supplied at the bottom of the riser through an air distribution plate, and secondary air could be injected at 1.3 or 1.8 m above the air distribution plate. Solids separated by the primary cyclone from gas-solid suspensions were fed to the ERE via a dipleg. The solids from the EHE were returned to the main combustion chamber (riser) through the L-valve. secondary cydone ash collector solids outlet -~ca explosion relief device ~--+-+- primary cydone ~--+-... EHE exhaust +--+-+- water tube coils ~ riser EHE fluidizing air ~:P--"" aeration primary air secondary air coal inlet air distribution plate Fig.1 A schematic of the CFB combustion system.
Setname	uu_afrc
ID	9943
Reference URL	https://collections.lib.utah.edu/ark:/87278/s66t0q8x/9943