Abstract
The investigation of burnout effects on the char particle emissivity in the spectral range from 1.25 to 5.5µm is presented. Single coal particles of a bituminous coal were combusted in a flat flame burner under oxy-fuel conditions (20.1mol%). The emissivity was determined using a test-rig, which also measures particle temperature and diameter, both being necessary input parameters for single particle emissivity, in the visual spectral range. The infrared radiation was measured spectrally resolved with a fiber spectrometer (1.25–2.25µm) and integrated with an InSb detector (2.4–5.5µm). The emissivity decreases clearly with progressing burnout: E.g. at 1255nm the emissivity decreases from 0.49 to 0.38. The effect is larger in the spectral range from 1.25 to 2.25µm, but still visible in the longer wave length range.
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