Preparation of hot-water-dried LRC-water fuel slurries

Conference · Sat Dec 01 04:00:00 EST 1984

OSTI ID:6262177

Potas, T A; Sears, R E; Maas, D J; Baker, G G; Willson, W G

Hot-water coal drying is a means of thermally beneficiating and dewatering lignite and subbituminous coal for the purpose of producing dense low-rank coal-water slurries. During hot-water drying, low-rank coal is treated at elevated temperatures (250/sup 0/ to 350/sup 0/C) and pressures in excess of the saturated steam pressures to minimize vaporization. This produces coal particulates with less than one-third the moisture of the raw coal which do not reabsorb appreciable water. The hot-water-dried coal-water slurries resulting from the process can be concentrated by mechanical means or by flash evaporation to form pumpable slurries with greater than 60% bone-dry solids content, which have energy contents of greater than 15.4 MJ/Kg (6600 Btu/lb). Hot-water drying also beneficiates the coal by reducing oxygen and minerals. Over 94% of the energy content of the raw coal remains in the product. Concentrated low-rank coal-water fuel slurries typically exhibit pseudoplastic flow behavior and some slurries are stable towards settling, without the use of additives. 14 references, 11 figures, 8 tables.

• Research Organization: North Dakota Univ., Grand Forks (USA). Energy Research Center
• DOE Contract Number: FC21-83FE60181
• OSTI ID: 6262177
• Report Number(s): DOE/FE/60181-95; CONF-850357-2; ON: DE85004380
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
BROWN COAL
CALORIFIC VALUE
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
COAL
COMBUSTION PROPERTIES
DATA
DISPERSIONS
DRYING
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUEL SLURRIES
FUELS
HIGH TEMPERATURE
HOT WATER
HYDROGEN COMPOUNDS
INFORMATION
LIGNITE
MATERIALS
MIXTURES
MOISTURE
NUMERICAL DATA
OXYGEN COMPOUNDS
PARTICLE SIZE
RHEOLOGY
SIZE
SLURRIES
SUBBITUMINOUS COAL
SUSPENSIONS
SYNTHESIS
TIME DEPENDENCE
VISCOSITY
WATER