Roles of additives and surface control in slurry atomization

Technical Report · Sat Dec 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/6052673· OSTI ID:6052673

Tsai, S C

This quarterly report describes the effects of anionic dispersant and nonionic surfactant on the rheology of micronized (Mass Median Diameters of 4 {mu}m and 10 {mu}m) coal water slurries (CWSs). We found that the micronized CWS is pseudoplastic (shear thinning) at a low additive concentration of either anionic dispersant or nonionic surfactant because coal particles aggregate under the influence of the interparticle van der Waals attraction. At a high additive concentration, the micronized CWS becomes Newtonian, and turns dilatent (shear thickening) at an even higher concentration of nonionic surfactant. The Newtonian behavior results as the interparticle van der Waals attraction is counterbalanced by the interparticle electrostatic repulsion; the dilatent behavior may be attributed to the cross linking of the nonionic surfactant molecules adsorbed on the coal particle surface. No dilatent behavior has been observed when using anionic dispersant. 8 refs., 3 figs., 1 tab.

• Research Organization: California State Univ., Long Beach, CA (USA)
• Sponsoring Organization: DOE/FE
• DOE Contract Number: FG22-88PC88912
• OSTI ID: 6052673
• Report Number(s): DOE/PC/88912-T8; ON: DE91007373
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ADDITIVES
ALCOHOLS
AMMONIUM COMPOUNDS
ATOMIZATION
CARBONACEOUS MATERIALS
CHEMICAL PROPERTIES
COAL
DISPERSIONS
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUEL SLURRIES
FUELS
GLYCOLS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MATERIALS
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PARTICLE SIZE
POLYETHYLENE GLYCOLS
POLYMERS
PROGRESS REPORT
RHEOLOGY
SIZE
SLURRIES
SULFONIC ACIDS
SURFACE PROPERTIES
SURFACTANTS
SUSPENSIONS
VISCOSITY
WATER