Coal Combustion in Fuel Rich Flames: A Review of Experimental Behavior

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Title Coal Combustion in Fuel Rich Flames: A Review of Experimental Behavior
Creator Essenhigh, Robert H.; Basak, Arun K.; Misra, Mahendra K.; Shaw, David W.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1988
Spatial Coverage presented at Pittsburgh, Pennsylvania
Abstract Reaction efficiencies (11) of cokes and coals in fuel-rich flames are shown generally to obey the simple mass-balance equation: 11 = 2 (R C S) [1 + E%/lOO]; over the range -80 to -30% excess air, and for an RCS factor of O.S. This RCS factor is for carbon conversion to CO2 with no CO; it implies very fast conversion of any primary CO. The data used were obtained in different experiments using a plug-flow furnace, a jet-mix reactor, and a high-intensity furnace. The trend of reaction efficiency above -30% excess air then depended on the reactor used. With the jet-mix reactor, the reaction efficiency peaked at about the stoichiometric equivalence ratio for an enhanced VM yield (at a Q-factor of 2). Temperatures also peaked at about that equivalence ratio for both the jet-mix reactor and the high-intensity furnace. The flame mechanism appears to be combustion primarily or totally in volatiles at this fuel-rich optimum, with heterogeneous reaction providing an increasing contribution as excess air increases. With decreasing excess air, however, as discussed in the paper, this argument appears to lead to the conclusion that the extent of pyrolysis may be governed by the availability of oxygen to react with it but there are obvious difficulties with this conclusion. These results show that a reasonably clear pattern of experimental behavior still presents major difficulties in mechanistic interpretation.
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
Metadata Cataloger Kendra Yates
ARK ark:/87278/s6mc92j9
Setname uu_afrc
Date Created 2012-04-20
Date Modified 2012-09-05
ID 5032
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