FUEL 14 |
| Fly ash carbons from high volatile bituminous coals, such as the coals burned at most Kentucky power plants, consist primarily of neoformed carbons repolymerized from a vitrinite-derived thermoplastic fluid and inertinite derived, without substantial alteration, from the inertinite component of the feed coal. In contrast, carbons in fly ashes from low-rank coals, such as burned in Bulgarian power stations, consist of inertinite and a vitrinite-derived char. The latter has obviously not passed through a plastic state. In both cases, Hg capture by the fly ash is a function of the temperature at the collection point and the amount of fly ash carbon. The ashes differ in the low-rank-derived carbons having a greater ability to capture Hg, based on a Hg/C ratio, than high volatile bituminous-derived carbons. The Hg/C ratio decrease with the amount of C in the fly ash, perhaps a function of the blinding of interior C surfaces with thicker carbons. |
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Mercury and Other Trace Elements in Fuel: Emissions and Control
8:25 AM-11:35 AM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 240/241, Oral
Division of Fuel Chemistry |