Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Theory and Fundamental Research in Heat Transfer 2013
DOI: 10.1115/ht2013-17413 View full text |Buy / Rent full text
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Abstract: Ash deposits decrease the boiler efficiency, reduce the generating capacity and cause unscheduled outages. The radiative heat transfer is the major heat transfer mechanism in utility boilers; thus, the ash deposit emissivity is critical to boiler efficiency and safety. This paper presents a radiative transfer model to predict the spectral emissivities of coal ash deposits. The model includes the effects of the microstructure, chemical composition and temperature. Typical ash deposit microstructures are generat… Show more

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“…The ash and char particles have been found to have similar size distributions for high rank coals52. The effect of the particle size distribution has been determined by comparing the spectral emittance calculated using Mie theory for ash clusters with uniform diameters and with lognormal size distributions3. This effect was found to cause average relative differences of less than 3%.…”
Section: Methodsmentioning
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“…The ash and char particles have been found to have similar size distributions for high rank coals52. The effect of the particle size distribution has been determined by comparing the spectral emittance calculated using Mie theory for ash clusters with uniform diameters and with lognormal size distributions3. This effect was found to cause average relative differences of less than 3%.…”
Section: Methodsmentioning
“…Therefore, each char particle was assumed to be a 50% porosity sphere consisting of 25% ash and 75% carbon. The Maxwell-Garnett effective medium theory344 was used to determine the ash and char particle optical constants from the chemical compositions. The representative aggregates were generated using the open-source code by Bentz55.…”
Section: Methodsmentioning
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“…15 Their measurement data have been used by Bhattacharya 19 to calculate single particle emittance based on Mie theory. Liu et al 20 generated an artificial ash particle cluster consisting of 714 spheres. Using measured absorption coefficients and refractive indices of SiO 2 , Al 2 O 3 , CaO, and Fe 2 O 3 , they have calculated spectral emittances using a generalized multiparticle Mie solution.…”
Section: Introductionmentioning