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Title: Influence of a Modification of the Petcoke/Coal Ratio on the Leachability of Fly Ash and Slag Produced from a Large PCC Power Plant

Abstract

Co-firing of coal with inexpensive secondary fuels such as petroleum coke is expected to increase in the near future in the EU given that it may provide certain economic and environmental benefits with respect to coal combustion. However, changes in the feed fuel composition of power plants may modify the bulk content and the speciation of a number of elements in fly ash and slag. Consequently, leachability of these byproducts also can be modified. This study is focused on identifying the changes in the environmental quality of co-fired fly ash and slag induced by a modification of the petcoke/coal ratio. Petcoke was found to increase the leachable content of V and Mo and to enhance the mobility of S and As. However, with the exception of these elements, the addition of this secondary fuel did not drastically modify the bulk composition or the overall leachability of the resulting fly ash and slag.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
959797
Report Number(s):
BNL-82783-2009-JA
Journal ID: ISSN 0013-936X; ESTHAG; TRN: US201016%%941
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Environmental Science and Technology; Journal Volume: 41
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 02 PETROLEUM; COAL; COKE; COMBUSTION; ECONOMICS; ENVIRONMENTAL QUALITY; FLY ASH; MODIFICATIONS; PETROLEUM PRODUCTS; POWER PLANTS; SLAGS; national synchrotron light source

Citation Formats

Izquierdo,M., Font, O., Moreno, N., Querol, X., Huggins, F., Alvarez, E., Diez, S., Otero, P., Ballesteros, J., and Gimenez, A.. Influence of a Modification of the Petcoke/Coal Ratio on the Leachability of Fly Ash and Slag Produced from a Large PCC Power Plant. United States: N. p., 2007. Web. doi:10.1021/es063002d.
Izquierdo,M., Font, O., Moreno, N., Querol, X., Huggins, F., Alvarez, E., Diez, S., Otero, P., Ballesteros, J., & Gimenez, A.. Influence of a Modification of the Petcoke/Coal Ratio on the Leachability of Fly Ash and Slag Produced from a Large PCC Power Plant. United States. doi:10.1021/es063002d.
Izquierdo,M., Font, O., Moreno, N., Querol, X., Huggins, F., Alvarez, E., Diez, S., Otero, P., Ballesteros, J., and Gimenez, A.. Mon . "Influence of a Modification of the Petcoke/Coal Ratio on the Leachability of Fly Ash and Slag Produced from a Large PCC Power Plant". United States. doi:10.1021/es063002d.
@article{osti_959797,
title = {Influence of a Modification of the Petcoke/Coal Ratio on the Leachability of Fly Ash and Slag Produced from a Large PCC Power Plant},
author = {Izquierdo,M. and Font, O. and Moreno, N. and Querol, X. and Huggins, F. and Alvarez, E. and Diez, S. and Otero, P. and Ballesteros, J. and Gimenez, A.},
abstractNote = {Co-firing of coal with inexpensive secondary fuels such as petroleum coke is expected to increase in the near future in the EU given that it may provide certain economic and environmental benefits with respect to coal combustion. However, changes in the feed fuel composition of power plants may modify the bulk content and the speciation of a number of elements in fly ash and slag. Consequently, leachability of these byproducts also can be modified. This study is focused on identifying the changes in the environmental quality of co-fired fly ash and slag induced by a modification of the petcoke/coal ratio. Petcoke was found to increase the leachable content of V and Mo and to enhance the mobility of S and As. However, with the exception of these elements, the addition of this secondary fuel did not drastically modify the bulk composition or the overall leachability of the resulting fly ash and slag.},
doi = {10.1021/es063002d},
journal = {Environmental Science and Technology},
number = ,
volume = 41,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • Co-firing of coal with inexpensive secondary fuels such as petroleum coke is expected to increase in the near future in the EU given that it may provide certain economic and environmental benefits with respect to coal combustion. However, changes in the feed fuel composition of power plants may modify the bulk content and the speciation of a number of elements in fly ash and slag. Consequently, leachability of these byproducts also can be modified. This study is focused on identifying the changes in the environmental quality of co-fired fly ash and slag induced by a modification of the petcoke/coal ratio.more » Petcoke was found to increase the leachable content of V and Mo and to enhance the mobility of S and As. However, with the exception of these elements, the addition of this secondary fuel did not drastically modify the bulk composition or the overall leachability of the resulting fly ash and slag. 30 refs., 3 figs., 2 tabs.« less
  • The composition of coal used as fuel at a thermal power plant and those of the fly and bottom ashes it produces were determined. Radioactive elements were analysed for by alpha and gamma spectrometry, while sulphur, carbon and nitrogen were determined by burning. Heavy metals were quantified by X-ray fluorescence spectrometry and inductively coupled plasma atomic emission spectroscopy (ICPAES). The low sulphur content of the coal (0.68%) gives rise to fly ash containing only 0.21% of this element. The radiochemical analyses performed by alpha spectrometry revealed that most of the uranium remains in the solid residue resulting from disaggregation ofmore » the sample with Na[sub 2]CO[sub 3] in the separation process. Also, the gamma spectrometric results show that the elements from the 4n and 4n + 2 series and [sup 40]K concentrate in fly ash, the mean particle size of which is the smallest of all the residues assayed. 8 refs., 5 figs., 5 tabs.« less
  • Trace elements were extracted from a coal-fired power plant electrostatic precipitator ash with nitric acid, hydrochloric acid, citric acid, redistilled water, and ammonium hydroxide as extractants. Effluent waters at this plant were sampled to assess the elevation of trace element concentrations compared with intake waters. The results showed a positive correlation between those elements most extractable by water (B, F, Mo, and Se) or acid (As, B, Cd, F, Mo, and Se) and those elements most elevated in effluent waters (As, B, F, Mo, and Se).
  • The earlier work of Chrisp et al showed that stack-collected fly ash carried a low level of mutagenic activity, approximately 30 revertants per milligram. We find, in contrast, that fly ash collected from precipitators of the same kinds of electrical power plants, burning a similar type of coal, are not observably mutagenic in the same assay system. Our results indicate that although precipitator fly ash account for approximately 95% of the fly ash product, it contributes little if at all to the total mutagenic activity of fly ash produced by coal-fired power plants.