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Influence of the Mineral Content on the Emissivity of Hydrothermal Char
Author(s) -
Graeser Philipp,
Pörtner Lukas,
Schiemann Martin
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201900623
Subject(s) - emissivity , char , pyrometer , combustion , iron oxide , mineralogy , hydrothermal carbonization , infrared , materials science , analytical chemistry (journal) , carbonization , chemistry , metallurgy , optics , environmental chemistry , temperature measurement , composite material , scanning electron microscope , physics , organic chemistry , quantum mechanics
The influence of minerals on solid fuel conversion is an important topic and has so far been addressed focusing mainly on the catalytic effects. Here, the impact of iron oxide on the emissivity of burning char particles was investigated. Synthetic, hydrothermally carbonized char was doped with SiO 2 or with a mixture of SiO 2 and Fe 2 O 3 . The sample was then exposed to an oxy‐fuel atmosphere in a laboratory reactor. An established pyrometer/infrared (IR) spectrometer setup was used to measure the size, temperature, and IR radiation of single burning particles. Based on these measurements, the spectral and total emissivity in the near‐IR (1.25–2.25 μm) and the total emissivity in the mid‐IR region (2.4–5.5 μm) were calculated. The results show that the iron content directly influences the emissivity of char during combustion.