NDLI: Characterization of Biomass Bottom Ash from an Industrial Scale Fixed-Bed Boiler by Fractionation

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Characterization of Biomass Bottom Ash from an Industrial Scale Fixed-Bed Boiler by Fractionation

Content Provider	Scilit
Author	James, Adrian K. Thring, Ronald W. Rutherford, P. Michael Helle, Steve S.
Copyright Year	2013
Description	It is expected that increasing amounts of energy will be generated from the direct combustion of biomass residues. However, biomass combustion processes are known to produce large amounts of bottom ash, resulting in ash storage and disposal problems. The presence of unburned carbon in some bottom ash suggests its potential for beneficial uses, such as an energy source. This comparative study characterizes two bottom ash samples obtained from an industrial scale fixed-bed boiler. The physical and chemical properties of each bottom ash, as well as their respective particle fractions obtained by sieving, are analyzed and discussed. Analyses included proximate and ultimate analysis, Brunauer–Emmett–Teller (BET) surface area, thermogravimetric analysis (TGA) and bulk density. The percent fixed carbon in the samples was 30% and 50%. The higher heating value (HHV) ranged from 5 - 25 MJ/kg for the ash samples when characterized within fractions. The boiler ash showed that 68 % or more of the energy could be recovered in fractions ? 425 µm for high carbon ash. Low carbon fractions of ash have four times the bulk density compared to the high carbon fractions. By reburning the larger fractions, ash volumes can be decreased by over 50%.
ISSN	19270569
e-ISSN	19270577
DOI	10.5539/eer.v3n2p21
Journal	Energy and Environment Research
Issue Number	2
Volume Number	3
Language	English
Publisher	Canadian Center of Science and Education
Publisher Date	2013-06-18
Access Restriction	Open
Subject Keyword	Paper and Wood Biomass Bottom Bottom Ash Bed Boiler Scale Fixed Fixed Bed Characterization of Biomass
Content Type	Text
Resource Type	Article

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