Variations in fly ash composition with sampling location: Case study from a Portuguese power plant
نویسندگان
چکیده
Fly ash (FA) is a heterogeneous and complex material resulting from coal combustion in thermoelectric power plants (TPP). Therefore, different types of coals, worldwide, produce FAs with different compositions. However, the location of the FA sampling system, inside the TPP, is also important to the composition of the FA produced at each location. A case study of FA from a Portuguese TPP, using several coal and FA characterization techniques (particle size analysis, proximate and ultimate analyses, XRF, SEM/ESEM/EDS, Optical microscopy, XRD, inferred chemistry, and AAS), has shown that FA chemical classification, mineralogy and phase-mineral classification, and trace elements (Cr, Cu, Mn, Ni, Pb, and Zn) vary due to sampling location. This has implications for improved understanding of the combustion system, as well as in collecting ash products from TPPs for particular market applications. f 2009 The University of Kentucky Center for Applied Energy Research and the American Coal Ash Association All rights reserved. A R T I C L E I N F O Article history: Received 28 October 2009; Received in revised form 4 December 2009; Accepted 9 December 2009
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