The Influence of Size Distribution Characteristics in Heterogeneous Combustion

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Title The Influence of Size Distribution Characteristics in Heterogeneous Combustion
Creator Holve, Donald J.; Hoornstra, Jacob; Fletcher, Thomas H.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1985
Spatial Coverage presented at Livermore, California
Abstract Recent measurements have underscored the importance of pulverized fuel size distribution effects in combustion processes. In addition to conventional pulverized fuels, new physical forms, such as ultrafine grind coals, are being investigated in both dried and liquid form. Coal/water slurries exhibit many positive features, but atomization and agglomeration effects on the spray size distribution present drawbacks for efficient use in combustion systems. This paper presents an overview of the effects of size distribution on (1) devolatilization (including the effects of volatiles combustion and char formation), (2) char combustion, and (3) flyash size characteristics. W e also present some recent measurements of particle size distributions for pulverized coal and coal/water slurries burning in a laminar flow reactor along with some calculations of particle combustion behavior. The relative importance of physical (e.g., initial size distribution and particle swelling) and chemical effects throughout the combustion process is discussed. In general, the top end of the size distribution controls char burnout, the mid-range initiates the ignition process, and the entire distribution spread determines the formation of residual flyash. These results show that use of a mean value for the size distribution is inadequate for describing the effects of particle size on the combustion process.
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/s60c4z9f
Setname uu_afrc
Date Created 2012-04-11
Date Modified 2012-08-09
ID 2015
Reference URL