2017
DOI: 10.1021/acs.energyfuels.6b02866
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Abstract: Oxyfuel ashes are supposed to form more sulfates than ashes from air-fired systems. This can be caused by the increased SO2 concentrations due to intensive flue gas recirculation in oxyfuel systems. Therefore, we investigated the spectral emittance characteristics of typical mineral sulfates in coal ashes, namely Mg and Ca sulfates. The samples were prepared in powder form. Two particle size fractions were examined (x < 32 μm and 125 < x < 160 μm). The powders were investigated concerning their temperature-dep… Show more

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Cited by 5 publications
(3 citation statements)
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References 29 publications
(43 reference statements)
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“…In another study, Cao et al [57] constructed an instrument for gas-cooled, high-temperature reactor materials using a rotating sample holder with seven sample holes and one blackbody hole to achieve fast switching between the reference and sample measurements. Gorewoda and Scherer [58,59] devised a measurement setup to study the emittance of carbonates and sulfates in coal ashes from oxyfuel combustion.…”
Section: Direct Measurementsmentioning
confidence: 99%
“…In another study, Cao et al [57] constructed an instrument for gas-cooled, high-temperature reactor materials using a rotating sample holder with seven sample holes and one blackbody hole to achieve fast switching between the reference and sample measurements. Gorewoda and Scherer [58,59] devised a measurement setup to study the emittance of carbonates and sulfates in coal ashes from oxyfuel combustion.…”
Section: Direct Measurementsmentioning
confidence: 99%
“…(4). This method of calculating the total emissivity, for example as used in references [16][17][18], results in slightly different absolute values, 79 although both methods are used in the literature. Application of the Planck correction influences the 80 temperature dependency of the total normal emissivity.…”
Section: The Definition Of Surface Emissivitymentioning
confidence: 99%
“…Molten ash deposition on the refractory walls or boiler tubes is important and data on the emissivity of slag covered walls is available and a summary is given in Table A4. The emissivity varies with the chemical composition of the slag and the iron and silica contents are important, as well as the physical nature of the surface, ie molten or sintered ash and on particle size [3, 17,19,64] or whether a phase change takes place [18,66]. The 238 influence of rough surfaces, whether due to dust layers or sintering, is discussed in Section 4.…”
Section: Figmentioning
confidence: 99%