Formulation of slurries for slurry-fed coal gasifiers: Final report
A 100 MW integrated gasification/combined cycle generating plant was recently put into operation at the Cool Water generating station of Southern California Edison Co. Coal is fed into the gasifier as a coal-water slurry. This report describes an experimental study on the slurryability of candidate gasifier coals and slurry formulation options for use in systems of this type. Relative to boiler and process-fuel applications, the gasifier application has some unique features. The slurry is continuously prepared on-site in wet rod mills and is stored in continuously-agitated day tanks. Stability of the slurry, then, is not a necessity. In addition, economic studies have shown that dispersant additives must be inexpensive (on the order of $.10/million Btu) to be attractive. The ten candidate coals studied ranged in equilibrium moisture from 1 to 13%. The set included Pittsburgh 8 seam coals, Illinois 6 seam coals, and one Utah coal. For three of the coals both run-of-mine and preparation-plant products were examined. Coal characterization included standard analyses, relative hydrophilic/hydrophobic nature, surface area, density, surfactant adsorption, and leachable ions. A ranking was made of the relative slurryability of the coals under two cases, with and without an added surfactant. The ranking, which was based on apparent viscosity at 100 sec/sup -1/, was somewhat different in the two cases. As others have reported, equilibrium moisture is a key parameter. Slurry formulation studies included the effects of size distribution, acid leaching, additional physical cleaning (both gravity separation and froth floatation), selected anionic and nonionic surfactants, pH, and oxidation to simulate weathering. 17 refs., 27 figs., 25 tabs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5702548
- Report Number(s):
- BNL-40281; ON: DE88004382
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
SLURRIES
COAL GASIFICATION PLANTS
COMBINED CYCLES
LAMINAR FLOW
TURBULENT FLOW
ADDITIVES
CHEMICAL PROPERTIES
CLEANING
COAL PREPARATION
COAL RANK
EXPERIMENTAL DATA
FUEL SLURRIES
LEACHING
MIXTURES
OXIDATION
PARTICLE SIZE
PHYSICAL PROPERTIES
PROGRESS REPORT
RECOMMENDATIONS
SURFACTANTS
TEXACO GASIFICATION PROCESS
VISCOSITY
WATER
WETTABILITY
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL GASIFICATION
DATA
DISPERSIONS
DISSOLUTION
DOCUMENT TYPES
ENERGY SOURCES
FLUID FLOW
FOSSIL FUELS
FUELS
GASIFICATION
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
INFORMATION
MATERIALS
NUMERICAL DATA
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SIZE
SUSPENSIONS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC CYCLES
010404* - Coal
Lignite
& Peat- Gasification
010600 - Coal
Lignite
& Peat- Properties & Composition
010300 - Coal
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