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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.659 CiteScore™: 1.2

ISSN Imprimer: 2150-3621
ISSN En ligne: 2150-363X

International Journal of Energy for a Clean Environment

Précédemment connu sous le nom Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.v6.i3.70
pages 329-341

SPECTRAL RADIATION CHARACTERISTICS OF COAL ASHES AND SLAGS

V. Scherer
Ruhr-University Bochum, Institute of Energy Technology, Universitätsstraße 150, 44801 Bochum
S. Linka
Department of Energy Plant Technology, University of Bochum, Bochum, Germany
S. Wirtz
Ruhr-University Bochum, Institute of Energy Technology, Universitätsstraße 150, 44801 Bochum

RÉSUMÉ

During the combustion of pulverized coal, ash particles can deposit on heat transfer surfaces, resulting in a negative influence on radiative and conductive heat transfer rates and, hence, system efficiency.
In this study, experimental investigations on the spectral emissivity of different coal ashes and slags are presented. An important result is that coal ashes show selective thermal radiation characteristics. The primary influence on the emissivity is the chemical composition. Therefore, measurements on the single phases SiO2, Al2O3, and MgO were carried out and compared with the emissivity of typical coal ashes and slags. Furthermore, the emissivity depends on temperature, mainly in the wavelength range from 1 to 6 μm.


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