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Title: Metallic species derived from fluidized bed coal combustion. [59 references]

Samples of fly ash generated by the combustion of Montana Rosebud coal in an experimental 18 inch fluidized bed combustor were collected. The use of a heated cascade impactor permitted collection of size fractionated material that avoided condensation of volatile gases on the particles. Elemental concentration trends were determined as a function of size and temperature and the results compared to published reports for conventional power plants. The behavior of trace metals appears to be substantially different in the two systems due to lower operating temperatures and the addition of limestone to the fluidized bed. Corrosion of the impactor plates was observed at the highest temperature and lowest limestone feed rate sampled during the study. Data from the elemental concentration and leaching studies suggest that corrosion is most likely due to reactions involving sodium sulfate. However, it is concluded that corrosion is less of a potential problem in fluidized-bed systems than in conventional coal-fired systems.
Authors:
;
Publication Date:
OSTI Identifier:
6651008
Report Number(s):
DOE/MC/08196-T1
DOE Contract Number:
AS21-77MC08196
Resource Type:
Technical Report
Research Org:
Colorado State Univ., Fort Collins (USA). Dept. of Chemistry
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; ALKALI METAL COMPOUNDS; CORROSIVE EFFECTS; COAL; FLUIDIZED-BED COMBUSTION; FLY ASH; CHEMICAL COMPOSITION; PARTICLE SIZE; ANTIMONY; ARSENIC; CASCADE IMPACTORS; COPPER; ELECTRON MICROSCOPY; ELEMENTS; EXPERIMENTAL DATA; GALLIUM; LEACHING; SAMPLING; SELENIUM; SULFUR TRIOXIDE; TEMPERATURE DEPENDENCE; TRACE AMOUNTS; AEROSOL WASTES; CARBONACEOUS MATERIALS; CHALCOGENIDES; CHEMICAL REACTIONS; COMBUSTION; DATA; DISSOLUTION; ENERGY SOURCES; FOSSIL FUELS; FUELS; INFORMATION; MATERIALS; METALS; MICROSCOPY; NUMERICAL DATA; OXIDATION; OXIDES; OXYGEN COMPOUNDS; SEMIMETALS; SEPARATION PROCESSES; SIZE; SULFUR COMPOUNDS; SULFUR OXIDES; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENTS; WASTES 014000* -- Coal, Lignite, & Peat-- Combustion