Preparation and analyses of low-rank coals for combustion applications. Quarterly report, July 1, 1985-September 30, 1985

Technical Report · Tue Oct 01 04:00:00 EDT 1985

OSTI ID:6408167

Smit, F J

The micronized slurry fuel was prepared by grinding the clean float coal with water in two stages. The first stage was a conventional 4-ft diameter overflow mill charged with a graduated load of 2-inch and smaller steel balls. The grinding was at about 44% solids with sufficient Diamond Shamrock A-23 dispersant added to provide fluidity. The ground slurry was screened and the small amount of plus 20-mesh (0.85-mm) material collected was discarded. The finish grinding was in a Draiswerke Perlmill Model PM-40 stirred ball mill charged with 3-mm chromium-steel media. The tumbling ball mill and the stirred ball mill were both operated in open-circuit with no classification or recycle. The finish-ground slurry was combined in a large blending tank to which additional water and dispersants were added as needed to achieve the target loading, viscosity and stability. A combination of anionic and nonionic dispersants were used in the final blend but no stabilizer was included in the formulation. Finished slurry properties are given in Table 1. Figure 2 is a rheogram of the flow properties of the slurry as determined with a Fann viscometer. The micronized powder fuel was also prepared from the clean float coal. The excess water was allowed to drain away and then the coal was pulverized in a Pulvocron PC-20 air-swept hammer mill and classifier systems at Bepex Corporation facilities in Minneapolis. The coal had dried during handling so the transport air did not have to be preheated for the pulverizer system to operate properly.

• Research Organization: AMAX Extractive Research and Development, Inc., Golden, CO (USA)
• DOE Contract Number: AC18-84FC10623
• OSTI ID: 6408167
• Report Number(s): DOE/FC/10623-1978; ON: DE86004678
• 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
ADDITIVES
ASHES
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COAL
COAL PREPARATION
COAL RANK
COMBUSTION
COMMINUTION
CRUSHING
DATA
DISPERSIONS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUEL SLURRIES
FUELS
GRINDING
GRINDING MACHINES
HEAVY MEDIA SEPARATION
INFORMATION
MACHINE TOOLS
MACHINING
MATERIALS
MIXTURES
NUMERICAL DATA
OXIDATION
PULVERIZED FUELS
RESIDUES
RHEOLOGY
SEPARATION PROCESSES
SLURRIES
SUSPENSIONS
SYNTHESIS
THERMOCHEMICAL PROCESSES
TOOLS