Parametric study of submicron particulates from pulverized-coal combustion
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 National Lab. (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6486170
- Report Number(s):
- LBL-12113
- Country of Publication:
- United States
- Language:
- English
Similar Records
Characteristics of fly ash from laboratory combustion of pulverized coal
Characterization of submicron particles influenced by mixed biogenic and anthropogenic emissions using high-resolution aerosol mass spectrometry: results from CARES
Related Subjects
COAL
COMBUSTION
FLY ASH
PARTICLE SIZE
ASHES
BENCH-SCALE EXPERIMENTS
BURNERS
DISTRIBUTION
EVAPORATION
PARAMETRIC ANALYSIS
VAPOR CONDENSATION
AEROSOL WASTES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
OXIDATION
PHASE TRANSFORMATIONS
RESIDUES
SIZE
THERMOCHEMICAL PROCESSES
WASTES
014000* - Coal
Lignite
& Peat- Combustion
010800 - Coal
Lignite
& Peat- Waste Management