Compositional Data Analysis of Coal Combustion Products with an Application to a Wyoming Power Plant
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A mathematically sound approach for summarizing chemical analyses of feed coal and all its combustion products (bottom ash, economizer fly ash, and fly ash) is presented. The nature of the data requires the application of compositional techniques when conducting statistical analysis, techniques that have not been applied before to the study of partitioning of elements between the coal that enters the boiler and the associated coal combustion products. A collection of descriptive and inferential compositional techniques was used to analyze the coal combustion products from a Wyoming power plant burning Paleocene Wyodak–Anderson coal. The significance of the fluctuation in ash composition is determined by using a Hotelling’s T-squared test and bootstrapping. Tree displays allow for visualization of the progressive effect of filters in removal of chemical species based on their geochemical composition. Results indicate that, in general, as the suspended combustion products entrained in the flue gases move closer to the stack, chemical species are removed from the combustion gas, starting with minerals associated with elements having the lowest volatility.
KeywordsAsh Balances Isometric log ratio Perturbation Precipitator Simplex
The authors wish to thank Mark Engle (USGS) and Vera Pawlowsky-Glahn (University of Girona) for their review and suggestions, which helped improve the manuscript. This work has been supported by the project “CODA-RETOS” (Spanish Ministry of Economy and Competitiveness; Ref. MTM2015-65016-C2-1-R) and the project “Compositional Data Analysis Related to Energy Resources Modeling” (“Salvador de Madariaga” program; “Fulbright” distinction; MECD; Ref. PRX16/00258). Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
- Affolter RH, Betterton WJ, Olea R, Brownfield ME, Ellis MS (2009) Preliminary results on the characterization of coal and coal combustion products (CCPs) from a western Power Plant utilizing Powder River Basin coal from the Wyodak–Anderson coal zone. In: Proceedings of the 34th annual conference on coal utilization, Clearwater, FL, 12 ppGoogle Scholar
- Affolter RH, Groves S, Betterton W, Benzel W, Conrad KL, Swanson SM, Ruppert LF, Clough JG, Belkin HE, Kolker A, Hower JC, (2011) Geochemical database of feed coal and coal combustion products (CCPs) from five power plants in the United States. US Geological Survey Data Series 635, pamphlet, p 19Google Scholar
- Aitchison J (1986) The statistical analysis of compositional data. Chapman and Hall. (Reprinted 2003 with additional material by The Blackburn Press), London, UKGoogle Scholar
- Clarke LB, Sloss LL (1992) Trace elements—emissions from coal combustion and gasification. In: International Energy Agency Coal Research Report IEACR/49, London, p 111Google Scholar
- Harris J (1982) The electricity of Holborn. New Sci 93(1288):88–90Google Scholar
- Martín-Fernández JA, Daunis-i-Estadella J, Mateu-Figueras G (2015) On the interpretation of differences between groups for compositional data. SORT 39(2):231–252Google Scholar
- OECD (2016) Factbook 2015–2016: economic, environmental and social statistics. OECD Publishing Paris, 223 p. http://www.oecd-ilibrary.org/docserver/download/3015041e.pdf?expires=1498597919&id=id&accname=guest&checksum=78E8BC6FD46BECA0A1C315B3D0EEC061. Accessed 02 Mar 2018
- Pawlowsky-Glahn V, Egozcue JJ, Tolosana-Delgado R (2015) Modeling and analysis of compositional data. Wiley, Chichester, p 247Google Scholar
- Schweinfurth SP (2009) An introduction to coal quality. In: The National Coal Assessment Overview, Pierce BS, Dennen KO, editors, U.S. Geological Survey Professional Paper 1625-F, 16 pp. http://pubs.usgs.gov/pp/1625f/downloads/ChapterC.pdf. Accessed 02 Mar 2018
- Seber GAF (2004) Multivariate observations. Wiley, New York, p 685. Reprint of 1984 editionGoogle Scholar
- The Electricity Council (1987) Electricity supply in the United Kingdom. The Electricity Council, London, 203 pp. https://ntmm.org/~nt/elecpow/history/electricity_supply_in_the_uk__a_chronology_ocrnopic.pdf. Accessed 02 Mar 2018