Abstract
The chemical and mineralogical composition of fly ash samples collected
from different parts of a laboratory and a pilot scale CFB facility has been
investigated. The fabric filter and the second cyclone of the two facilities
were chosen as sampling points. The fuels used were Greek lignite (from the
Florina basin), Polish coal and wood chips. Characterization of the fly ash
samples was conducted by means of X-ray fluorescence (XRF), inductive coupled
plasma-optical emission spectrometry (ICP-OES), thermogravimetric analysis
(TGA), particle size distribution (PSD) and X-ray diffraction (XRD). According
to the chemical analyses the produced fly ashes are rich in CaO. Moreover,
SiO2 is the dominant oxide in fly ash with Al2O3 and Fe2O3 found in
considerable quantities. Results obtained by XRD showed that the major mineral
phase of fly ash is quartz, while other mineral phases that are occurred are
maghemite, hematite, periclase, rutile, gehlenite and anhydrite. The ICP-OES
analysis showed rather low levels of trace elements, especially for As and Cr,
in many of the ashes included in this study compared to coal ash from
fluidised bed combustion in general.
Original language | English |
---|---|
Pages (from-to) | 2186-2193 |
Journal | Fuel |
Volume | 86 |
Issue number | 14 |
DOIs | |
Publication status | Published - 2007 |
MoE publication type | A1 Journal article-refereed |
Keywords
- CFB fly ash
- Bituminous coal
- Wood chips
- Lignite