Rheology of coal-water slurries prepared by the HP roll mill grinding of coal

Technical Report · Tue Dec 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/6698413· OSTI ID:6698413

Fuerstenau, D W

The objective of the research is the development of improved technology for the preparation of coal-water slurries, which have potential for replacing fuel oil in direct combustion. The fine grinding of coal is a crucial step in the manufacture of coal-water slurries. In this context, currently available grinding mills exhibit poor energy efficiency for size reduction and non-optimum packing characteristics of the ground coal. The first increases the cost of manufacture of coal-water slurries and the second adversely affects their rheological properties. The newly invented choke-fed, high-pressure roll mill is up to 50% more energy efficient and, moreover, there are reasons to believe that it produces a size distribution of ground particles which is closer to the dense packing composition. The high-pressure roll mill (which is perhaps the only really significant innovation in industrial comminution in this century) has lower capital cost, occupies less floor space, shows negligible wear rate, accepts feed with a wide range of moisture contents and, of particular importance, it can be scaled up to grind hundreds of tons of solids per hour. The high-pressure roll mill provides a unique opportunity to develop an improved technology for preparing coal-water slurries. Our research group in the University of California at Berkeley not only has a fully instrumented, laboratory-scale, choke-fed. high-pressure roll mill (the only one of its kind in the United States) but also fully instrumented laboratory ball mills for comparative fine coal preparation purposes. In this research program, our plans are to systematically investigate comminution energy consumption, deagglomeration procedures, and the stability and rheology of coal-water slurry fuel prepared with high-pressure roll mill, and to compare the results with slurry prepared with ball-milled coal.

• Research Organization: California Univ., Berkeley, CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-92PC92526
• OSTI ID: 6698413
• Report Number(s): DOE/PC/92526-T1; ON: DE93012559
• 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
CARBONACEOUS MATERIALS
CHEMICAL PREPARATION
COAL
COMMINUTION
COMPARATIVE EVALUATIONS
DISPERSIONS
DISTRIBUTION
DOCUMENT TYPES
ENERGY CONSUMPTION
ENERGY SOURCES
EVALUATION
FOSSIL FUELS
FUEL SLURRIES
FUELS
GRINDING
GRINDING MACHINES
HYDROGEN COMPOUNDS
MACHINE TOOLS
MACHINING
MATERIALS
MIXTURES
OXYGEN COMPOUNDS
PARTICLE SIZE
PLANNING
PROGRESS REPORT
RHEOLOGY
SIZE
SLURRIES
SUSPENSIONS
SYNTHESIS
TOOLS
WATER