Investigation of Pulverized Biomass and Coal Char Emissivity

Lukas Pörtner, Ying Gu and Martin Schiemann
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Lukas Pörtner: Energy Plant Technology, Ruhr-University Bochum, 44801 Bochum, Germany
Ying Gu: Energy Plant Technology, Ruhr-University Bochum, 44801 Bochum, Germany
Martin Schiemann: Energy Plant Technology, Ruhr-University Bochum, 44801 Bochum, Germany

Energies, 2020, vol. 13, issue 18, 1-11

Abstract: Current work presents an optical setup, its calibration and reference process and the first results from single particle emissivity measurements of pulverized biomass and coal fuel particles. In contrast to earlier attempts, the setup offers the possibility of emissivity measurements during the whole particle burn-off. A laser ignites a single particle, placed in the center of the setup. Two photomultipliers observe the emitted particle radiation in the visible range (550 nm and 700 nm) for temperature calculation, using two-color pyrometry. An InSb-detector records the emitted particle radiation between 2.4 µm and 5.5 µm, which is later used to calculate particle emissivity in this range. The conclusion of multiple particle measurements lead to decreasing particle emissivity with increasing temperature. For coal particles the emissivity decreases from 0.45 at 2300 K to 0.03 at 3400 K. Biomass char shows a similar trend with a decrease from 0.18 (2100 K) to 0.03 (2900 K).

Keywords: biomass; pulverized fuel; two-color pyrometry; emissivity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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