Transformations of inorganic coal constituents in combustion systems: Quarterly report No. 2 for the period January-March 1987

Technical Report · Thu Apr 30 04:00:00 EDT 1987

OSTI ID:6623575

A model has been developed to simulate the process of fly ash formation during pulverized coal combustion. The model is a site percolation type model, with occupied sites representing char, and unoccupied sites representing pores. Porosity (taken to be macroporosity), mineral matter grain size distribution in the coal particle, reaction rate, and ash surface coalescence rate are independently variable. Preliminary simulation results, utilizing a monodisperse mineral grain size distribution for the cases of 0 and 10% porosity, qualitatively predict the features of experimentally observed ash particle size distributions obtained in a parallel study by Helble (1987). One large particle is produced per char particle at 0% porosity, identical to the results obtained for a non-macroporous sucrose/carbon black char doped with sodium silicate. Hundreds of ash particles per char particle are produced for the case of 10% porosity, consistent with the experimentally observed results for macroporous doped Spherocarb. Future simulations are planned in an effort to quantify these effects, and to ultimately predict the effect of char fragmentation upon a coal-generated ash particle size distribution. 26 refs., 27 figs., 5 tabs.

• Research Organization: Physical Sciences, Inc., Andover, MA (USA)
• DOE Contract Number: AC22-86PC90751
• OSTI ID: 6623575
• Report Number(s): PSI-TR-1024/673; ON: DE87009194
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASHES
AUGER ELECTRON SPECTROSCOPY
BROWN COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COMBUSTION
DEPOSITS
DIAGRAMS
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ENERGY SOURCES
EVAPORATION
FLY ASH
FOSSIL FUELS
FUELS
LIGNITE
MATERIALS
MICROSCOPY
MINERALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
RESIDUES
SCANNING ELECTRON MICROSCOPY
SILICON COMPOUNDS
SILICON OXIDES
SODIUM COMPOUNDS
SODIUM OXIDES
SPECTROSCOPY
THERMOCHEMICAL PROCESSES
VAPOR CONDENSATION
WASTES