Effective Thermal Conductivity of Coal Ash Deposits at Moderate to High Temperatures

[+] Author and Article Information
D. W. Anderson, R. Viskanta, F. P. Incropera

Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Eng. Gas Turbines Power 109(2), 215-221 (Apr 01, 1987) (7 pages) doi:10.1115/1.3240027 History: Received August 01, 1985; Online October 15, 2009


The effective thermal conductivity of coal ash deposits strongly influences heat transfer in pulverized coal-fired boilers. In this study thermal conductivity measurements were performed over a wide range of temperatures for fly ash, slagging deposits, and fouling deposits. The effects of ash particle size, thermal history, and physical structure of the deposit are discussed. Thermal history and deposit structure were observed to have the greatest influence on the local thermal conductivty, which increased by an order of magnitude with particle melting. Conductivities for solid-porous deposits were twice those of the same sample in particulate form.

Copyright © 1987 by ASME
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