首页|Chlorine in coal and its relationship with boiler corrosion. Final technical report, September 1, 1993--August 31, 1994
Chlorine in coal and its relationship with boiler corrosion. Final technical report, September 1, 1993--August 31, 1994
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Literature and use-history data indicate that high-Cl Illinois coals do not cause boiler corrosion while extensive data developed by the British correlate corrosion with chlorine content and other parameters related to the coal and boiler. The differences in corrosivity in coals may be due to coal properties, to coal blending, or to boiler parameters. The goals of this study focused on coal properties. The goals were to determine the forms of Cl, the characteristics of Cl evolution, and the ash composition of Illinois and British coals; to compare these parameters in Illinois and British coals; and to establish relationships, if any, between these parameters and the corrosivity of the coal. The results of Cl analyses indicate that the Cl in coal exists in ionic forms, including small amounts of solid NaCl. When heated under air, Illinois coals released hydrogen chloride gas, with maximum evolution occurring between 425 to 475(degrees)C, whereas, for British coals, the maximum evolution occurred between 210 and 280(degrees)C. Ash analyses indicate that three of the four British coals contain a higher level of soluble sodium related to soluble potassium. A similar relationship was exhibited for the relative corrosion indices (I(sub c)) calculated according to Borio et al. The I(sub c) values for the British coals were 53.94, 15.05, 292.92, and 51.42; for the Illinois coals they were 17.04, 17.50, 11.62, 10.90, and 10.55. Caution should be exercised in interpreting corrosion indices reported in this study since they constitute an extrapolation outside their original correlation. This is because the soluble Na(sub 2)O measured in this study was higher than the maximum values measured by Borio et al.
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