Indirect drying of 28xo filter cake
The indirect method of drying coal fines is applied to filter cakes which ordinarily contain 22 to 30% moisture and are not readily transportable. The ''Thermal Dryer'', which operates on the mass transfer principle, has found wide use in coal preparation plants. The thermal dryer is penalized in operation by the necessity of adding coarse coal to the wet fines before entering the dryer body in order to produce a permeable bed, and thus enable hot gases to uniformly contact the wet mass. The ratio of coarse coal to fines varies from 2:1 to as much as 4:1, depending on the average particle size, moisture, and ash content of the fines. The fundamental purpose of the thermal dryer is to dry only the fines, since the coarse coal is dewatered sufficiently by other methods to meet trade specifications. Large tonnages of materials must be handled, not only the clean coal but also the dust laden gases and scrubber effluent.
- OSTI ID:
- 6964263
- Report Number(s):
- CONF-851054-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
ASH CONTENT
COAL FINES
COAL PREPARATION
COAL PREPARATION PLANTS
DRYERS
DRYING
EQUIPMENT
FILTERS
FLOTATION
FLUIDIZATION
INDUSTRIAL PLANTS
MASS TRANSFER
MOISTURE
PARTICLE SIZE
PERMEABILITY
POLLUTION CONTROL EQUIPMENT
QUANTITY RATIO
REMOVAL
SCRUBBERS
SEPARATION PROCESSES
SIZE
SPECIFICATIONS
WATER REMOVAL