Development of an advanced process for drying fine coal in an inclined fluidized bed

Technical Report · Sun Oct 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5586826· OSTI ID:5586826

Boysen, J. E.; Kang, T. W.; Cha, C. Y.; Berggren, M. H.; Jha, M. C. ^[1]

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1. Western Research Inst., Laramie, WY (USA)

The main objective of this research is to develop a thermal process for drying fine coal that (1) reduces explosion potential, (2) uses a fluidized bed with minimum elutriation, (3) produces a stable dry coal by preventing moisture reabsorption and autogeneous heating, (4) reduces fugitive dust emissions, and (5) is technically and economically feasible. The project scope of work requires completion of five tasks: (1) project planning, (2) characterization of the two feed coals, (3) bench-scale IFB drying studies, (4) product characterization and testing, and (5) technical and economic process evaluation. The project technical achievements are primarily related to understanding of the behavior of the two coals in the IFB reactor. Solids residence time and solids entrainment can be correlated using the Reynolds number. Gas produced from the coal during drying and the product composition can be correlated to the average dryer temperature. A dry product with minimal proximate moisture and substantially increased heating value can be produced from either of these coals under a wide variety of fluidizing gas-to-solids ratios and IFB operating temperatures. Product characterization indicates that moisture reabsorption can be significantly reduced and that fugitive dust contents can be almost completely reduced. 4 refs., 19 figs., 24 tabs.

• Research Organization: Western Research Inst., Laramie, WY (USA)
• Sponsoring Organization: DOE/FE
• DOE Contract Number: AC22-88PC88886
• OSTI ID: 5586826
• Report Number(s): DOE/PC/88886-T4; ON: DE90003036
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
BENCH-SCALE EXPERIMENTS
CARBONACEOUS MATERIALS
COAL
DOCUMENT TYPES
DRYING
ENERGY SOURCES
FLUIDIZATION
FLUIDIZED BEDS
FOSSIL FUELS
FUELS
MATERIAL BALANCE
MATERIALS
PARTICLE SIZE
PROGRESS REPORT
REYNOLDS NUMBER
SIZE
SORPTIVE PROPERTIES
SUBBITUMINOUS COAL
SURFACE AREA
SURFACE PROPERTIES