Coal fracturing and heteroatom removal. Annual report, fiscal year 1983
Coal-water slurry fuels offer a practical, economical method to use coal, replacing the 3 million barrels of oil used per day to fuel utility boilers, industrial heaters, and furnaces in the US. The mineral matter and in some cases the costs of grinding are major impediments to the direct use of this fuel in existing fluid fuel combustors. A process for the simultaneous cleaning and fracturing of a variety of coals has been explored at Brookhaven National Laboratory. This process entails exposure of coal to a carbon dioxide-water solvent system under pressure. Substantial amounts of mineral matter are leached into the liquid phase, significantly lowering the concentrations of alkaline, and alkaline earth metals, and of silica- and alumina-like minerals in the coal. Grindability studies have been conducted in a laboratory ball mill using processed coal. Grinding times for large-size feed coal (1-3/8 to 3/8 in.) are reduced by a factor up to 10 following exposure to CO/sub 2//water. With smaller-feed coal (4 x 8 mesh), however, improvements in grindability are much smaller. An integrated system has been constructed in which coal is ground while under CO/sub 2/ pressure. Significant improvements in grindability have been observed with this system, even with smaller-feed coal. 20 refs., 8 figs., 24 tabs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5395212
- Report Number(s):
- BNL-51749; ON: DE85017013
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ASHES
CHEMICAL COMPOSITION
COAL
ASH CONTENT
GRINDING
PARTICLE SIZE
WASHING
CARBON DIOXIDE
CLEANING
EXPERIMENTAL DATA
FRACTURING
FUEL SLURRIES
MILLING MACHINES
MINERALS
MIXTURES
REMOVAL
TIME DEPENDENCE
WATER
CARBON COMPOUNDS
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
COMMINUTION
DATA
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
INFORMATION
MACHINE TOOLS
MACHINING
MATERIALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RESIDUES
SIZE
SLURRIES
SUSPENSIONS
TOOLS
013000* - Coal
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010600 - Coal
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