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S 1130-1134 D VCH Verlagrgerellrchaft mbH, D-69469 We n + e q '?Pi 0009-286W970808 1130 517 'iO+ 53'0 -Schuttgutbewegung und Warmetransport im Wanderbett -Teil 1"

Thermal radiation of gadsolid mixtures in high-temperature heat exchangers is of considerable importance for the design of heat exchange surfaces. Therefore, an experimental plant was constructed to measure solid particle emissivities, since there is a lack of relevant data in the existing literature. A theoretical equation was derived to describe the solid particle emissivity as a function of layer thickness, specific solid surface area, solid loading and absorption and scatter coefficients. Measurements were carried out for fluidized bed ash and quartz sand. The emissivities of these particle fractions increase with increasing layer thickness, solid loading, specific solid surface area and temperature. The description of these data by the derived model equation is very satisfactory. No dependence on wavelength was observed. The ash components do exert some influence which, for the present, cannot be described exactly.

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