The partitioning of iron during the combustion of pulverized coal

Conference · Sun Jan 01 04:00:00 EST 1995 · Combustion and Flame; (United States)

OSTI ID:6574999

Bool, III, L E; Peterson, T W; Wendt, J O.L. ^[1]

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1. Univ. of Arizona, Tucson, AZ (United States). Dept. of Chemical Engineering

The partitioning of iron during pulverized coal combustion was investigated both experimentally and theoretically. Emphasis was on determining how coal variables and combustion conditions influenced the formation of slagging precursors. Experimental work consisted of burning a suite of six well-characterized coals in an aerodynamically well-defined 17 kW downflow combustor. Speciation of iron in collected ash samples was determined by Moessbauer Spectroscopy. A model was developed to predict the partitioning of iron for the coals and experimental conditions examined. The model was based on a competition between pyrite oxidation and iron capture by silicates and required as input, CCSEM data on the initial distribution of mineral matter in the coal. It used literature-derived mechanisms and kinetics to calculate pyrite oxidation and char combustion rates, together with a new glass formation mechanism, coupled with current knowledge of sintering. Requiring only two unknown parameters to be fitted, the model agreed well with 26 sets of experimental data, which covered a wide range of iron partitioning in the fly ash. Both experimental and theoretical results suggest that removal from the parent coal, of extraneous iron alone, may not be very effective in eliminating slag formation in boilers.

• OSTI ID: 6574999
• Report Number(s): CONF-940711--
• Conference Information: Journal Name: Combustion and Flame; (United States) Journal Volume: 100:1-2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
ASHES
BOILERS
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
COAL
COMBUSTION KINETICS
COMBUSTION PRODUCTS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FOULING
FUELS
IRON
KINETICS
MATERIALS
MATHEMATICAL MODELS
METALS
PARTITION
REACTION KINETICS
RESIDUES
SLAGS
TRANSITION ELEMENTS