Parametric study of submicron particulates from pulverized-coal combustion

Technical Report · Thu Jan 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6486170· OSTI ID:6486170

Pennucci, J; Greif, R; Parsons, G; Robben, F; Sherman, P

Pulverized coal sieved through a 200 mesh screen (particle diameter <75 ..mu..) was entrained in an air/methane/oxygen mixture and burned in an enclosed bunsen type burner fitted with a chimney. Measurements were made of the number and size of the particles in the submicron range (100 A to 500 A) downstream of the chimney exit using a transmission electron microscope. Variations in flame temperature (1900 to 2500/sup 0/K), cooling rate (3500 to 8000/sup 0/K/sec) and oxygen concentration (equivalence ratio from .62 to .94) were made. Cold secondary air was injected at the chimney exit. Results showed a sharp peak in the particle size distribution at diameters below 200 A for high cooling rates at high initial temperatures, suggesting homogeneous condensation of vaporized ash. At lower cooling rates the peak shifts toward larger particles. It appears possible, therefore, to control particulate emissions by modification of combustion and heat transfer conditions.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6486170
• Report Number(s): LBL-12113
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
&amp; Peat-- Waste Management
014000* -- Coal
Lignite
&amp; Peat-- Combustion
AEROSOL WASTES
ASHES
BENCH-SCALE EXPERIMENTS
BURNERS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COMBUSTION
DISTRIBUTION
ENERGY SOURCES
EVAPORATION
FLY ASH
FOSSIL FUELS
FUELS
MATERIALS
OXIDATION
PARAMETRIC ANALYSIS
PARTICLE SIZE
PHASE TRANSFORMATIONS
RESIDUES
SIZE
THERMOCHEMICAL PROCESSES
VAPOR CONDENSATION
WASTES