Investigation of pyrite as a contributor to slagging in eastern bituminous coals. Final report. Part 2

Technical Report · Fri Mar 01 04:00:00 EST 1985

OSTI ID:5590925

Bryers, R W; Walchuk, O R

Variations in composition of the slag when compared with coal ash, suggested specific minerals are being selectively deposited on furnace walls depending upon their specific gravity, size, composition, physiocochemical properties, and association with carbonaceous material and other mineral matter. The impact of specific mineral forms and the manner in which they occur in coal on fireside deposits was investigated by first characterizing the distribution of minerals and inorganic elements in coal, and then examining the chemistry and morphology of the deposits formed on heat transfer surfaces in a combustor nominally rated at 100 lb/h. Determination of the distribution of mineral matter in the coal was accomplished by performing a mineral analysis on low-temperature ash and the elemental analysis on ASTM ash in size and gravity fractionated coal pulverized to 50% through 200 mesh. A washability test was performed on the coal causing the most severe slagging. The coal was then washed, pulverized, and burned in the combustor, permitting an evaluation of coal cleaning on a specific coal. The program was divided into six tasks: selection of eight candidate coals; chemical characterization of the coal samples and identification of pyrite, size, distribution and orientation with respect to other mineral matter and concentration levels; testing of the candidate coals in a laboratory furnace; chemical and physical characterization of the slag and fly ash samples created by the impurities in the coal sample; influence of coal beneficiation on furnace slagging; and analysis of data and identification of parameters influencing the contribution of pyrite to slagging problems. This volume contains: work done for tasks 5 and 6; summary, discussion and conclusions; acknowledgements; and appendices. 78 figs., 20 tabs.

• Research Organization: Foster Wheeler Development Corp., Livingston, NJ (USA)
• DOE Contract Number: AC22-81PC40268
• OSTI ID: 5590925
• Report Number(s): DOE/PC/40268-8-Pt.2; ON: DE85014562
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
014000* -- Coal
Lignite
& Peat-- Combustion
AEROSOL WASTES
ASHES
BITUMINOUS COAL
BLACK COAL
BOILERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CLEANING
COAL
COMBUSTION PRODUCTS
COMBUSTORS
COMMINUTION
DATA
DEPOSITS
ELECTRON MICROPROBE ANALYSIS
ELECTRON MICROSCOPY
ENERGY SOURCES
EXPERIMENTAL DATA
FLY ASH
FOSSIL FUELS
FOULING
FUELS
FURNACES
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MICROANALYSIS
MICROSCOPY
MINERALOGY
MINERALS
MORPHOLOGY
NUMERICAL DATA
PYRITE
RESIDUES
SCANNING ELECTRON MICROSCOPY
SLAGS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TESTING
TRANSITION ELEMENT COMPOUNDS
WASHING
WASTES