Coal slurry mixing: residence time and temperature effects on SRC feed slurries

Technical Report · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6627406

Johnson, J K; Dickerson, L S; Rodgers, B R; Youngblood, E L

The initial steps of all direct coal-liquefaction processes include the mixing of a process-derived solvent with the ground coal. Typically, the solvent is cooled prior to the mixing step. If the operating temperature of the slurry mixing system could be increased, the size of the solvent cooler would be reduced and, in turn, the load on the slurry preheater would be decreased. Because of the potential advantages in thermal efficiency and capital cost, studies were conducted to determine the feasibility of operating the slurry mixing system at temperatures up to 505 K (450/sup 0/F). The behavior of feed slurries representative of those used at the SRC pilot plants located at Ft. Lewis, Washington, and Wilsonville, Alabama, was studied in this investigation. These slurries, with coal concentrations of 38.5 wt %, were tested at temperatures from 300 to 507 K (80 to 453/sup 0/F) to determine the effects of temperature and residence time on their physical properties, particularly viscosity. Operation of a demonstration plant or a production facility with the Wilsonville slurry might be more difficult at higher mixing temperatures because of the solids settling and the problems associated with deposits in the equipment. Overall, the Ft. Lewis slurry behaved much more satisfactorily, although some minor buildups did occur in the system. An appendix has been entered separately.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6627406
• Report Number(s): ORNL/TM-8438; ON: DE83005177
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CARBONACEOUS MATERIALS
COAL
DATA
DENSITY
DEPOSITS
DISPERSIONS
EFFICIENCY
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
INFORMATION
MATERIALS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MIXING
MIXTURES
NUMERICAL DATA
ORGANIC SOLVENTS
PHYSICAL PROPERTIES
RHEOLOGY
SLURRIES
SOLVENTS
SUSPENSIONS
TEMPERATURE DEPENDENCE
THERMAL EFFICIENCY
TIME DEPENDENCE
VISCOSIMETERS
VISCOSITY
WASTE HEAT UTILIZATION
WASTE PRODUCT UTILIZATION