Variations in fly ash composition with sampling location: Case study from a Portuguese power plant

Authors

B. Valentim, Centro e Departamento de Geologia Faculdade de Cieˆncias da Universidade do Porto, Rua do Campo Alegre 687, 4169-007, Porto, Portugal.
A. Guedes, Centro e Departamento de Geologia Faculdade de Cieˆncias da Universidade do Porto, Rua do Campo Alegre 687, 4169-007, Porto, Portugal
D. Flores, Centro e Departamento de Geologia Faculdade de Cieˆncias da Universidade do Porto, Rua do Campo Alegre 687, 4169-007, Porto, Portugal
C.R. Ward, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
J.C. Hower, University of Kentucky Center for Applied Energy Research, Lexington, Kentucky

Document Type

Article

Abstract

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.

First Page

14

Last Page

24

DOI

https://doi.org/10.4177/CCGP-D-09-00017.1

Volume

1

Publication Date

1-1-2010

Recommended Citation

Valentim, B, A Guedes, D Flores, C.R Ward, and J.C Hower. 2010. “Variations in Fly Ash Composition with Sampling Location: Case Study from a Portuguese Power Plant.” Coal Combustion and Gasification Products 1 (2): 14–24. https://doi.org/10.4177/CCGP-D-09-00017.1.