A novel method of atomizing coal-water slurry fuels

Technical Report · Tue May 01 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/6581179· OSTI ID:6581179

Sojka, P E; Lefebvre, A H

Despite the body of work describing the performance of effervescent atomizers, its potential for use with coal water slurries (CWS) had not been evaluated prior to this study. This program was therefore undertaken: to demonstrate that effervescent atomization can produce CWS sprays with mean drop sizes below 50{mu}m; to determine a lower size limit for effervescent atomizer produced CWS sprays; to determine the mechanism(s) responsible for the formation of effervescent atomizer produced sprays. An analysis of the effects of slurry rheological properties (as indicated by the consistency index and the flow behavior index) and formulation (in terms of loading and coal particle top size) on the spray formation process was performed. The experimental data reported were then analyzed to explain the physical processes responsible for spray formation. The analysis began by considering an energy balance across a control volume that extended from the nozzle exit plant to the line of spray measurement. The inlet conditions were calculated using two-phase flow techniques and the outlet conditions were calculated by using conservation of momentum and assuming that the final velocities of the air and liquid were equal. Entrainment was considered negligible and losses were accounted for by realizing that only a small fraction of the atomizing air participated in the spray formation process with the remainder passing through the control volume unperturbed. Results are discussed. 41 figs., 4 tabs.

• Research Organization: Purdue Univ., Lafayette, IN (USA). Thermal Sciences and Propulsion Center
• Sponsoring Organization: DOE/FE
• DOE Contract Number: FG22-87PC79913
• OSTI ID: 6581179
• Report Number(s): DOE/PC/79913-T4; ON: DE91000001
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ATOMIZATION
CARBONACEOUS MATERIALS
COAL
DISPERSIONS
DOCUMENT TYPES
DROPLETS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL SLURRIES
FUELS
MATERIALS
MIXTURES
NOZZLES
PARTICLES
PRESSURE EFFECTS
PROGRESS REPORT
RHEOLOGY
SLURRIES
SPRAYS
SUSPENSIONS