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Title Predicting Coal Quality Effects on P. F. Firing from a Coal's Ultimate Analysis
Creator Niksa, Stephen
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1995
Spatial Coverage presented at Monterey, California
Abstract It is well-established that the rapid heating conditions in -pulverized coal flames enhance volatiles yields well above the Proximate Volatile Matter for some, but not all, coals. Such variations have made it impossible to assess the impact of coal quality on combustion efficiencies and emissions with simple engineering correlations based on the standard analytical data for coal. New coal samples must be characterized in drop tube furnaces or wire grid reactors at lab-scale or in pilot-scale combustors. Although these tests provide the necessary information, they are expensive and time-consuming, and usually do not describe heat release rates or product distributions in detail. SRI International's FLASHCHAIN computer model accurately simulates the devolatilization behavior of any coal at p.f. firing conditions. The model predicts the release rates and yields of volatiles, including the contributions from hydrocarbon gases, tars, oxygenated gases, and nitrogen species, and the residual nitrogen content and amount of char. The ultimate analysis is the only sample-specific information required, yet the model predictions match the observed sample-to-sample variability among even very similar coal types. The model has already been evaluated against the observed behavior of some 125 coals across the rank spectrum, representing heating rates from 0.5 to lOS K/s, pressures from vacuum to 70 atm, and temperatures to 1700 C. This paper will demonstrate the accuracy of the predictions and illustrate how the model can be used to supersede lab testing or to expedite and support pilot- and full-scale testing.
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/s62b91k1
Setname uu_afrc
ID 9026
Reference URL https://collections.lib.utah.edu/ark:/87278/s62b91k1

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Title Page 8
Format application/pdf
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Setname uu_afrc
ID 9023
Reference URL https://collections.lib.utah.edu/ark:/87278/s62b91k1/9023