Aerosol formation from pulverized coal combustion. Final technical report

Technical Report · Wed Jan 15 04:00:00 EST 1986

OSTI ID:5966470

Peterson, T W; Linak, W P

Pulverized samples of Utah bituminous, Beulah (North Dakota) low Na lignite, Beulah high Na lignite and Texas (San Miguel) lignite coals were burned at a rate of 2.5 kg/hr in a laboratory furnace under various (overall fuel lean) combustion conditions. Particle size distributions (PSD) and size segregated particle filter samples were taken at various positions within the convection section. Temperature and gas concentrations were measured. The evolution of the submicron PSD within the convection section for the four coals was similar, although the location of the initial particle mode at the convection section inlet varied with coal type. Chemical analysis of the size segregated particle samples show the trace elements, As, Pb, Zn and the major elements, Na and K to be enriched in the submicron aerosol. Auger depth profiles show these small particles to be comprised of a core enriched in Fe, Si, Ca and Mg and surface layers enriched in Na and K. These results point to a mechanism of homogeneous nucleation of low vapor pressure species followed by successive layering of progressively more volatile species. Volatile species are enriched in the submicron aerosol due to the large surface areas provided. Modeling efforts show that coagulation cannot be used solely to predict the PSD. Another mechanism, presumably surface area dependent growth (condensation) must be included.

• Research Organization: Arizona Univ., Tucson (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG22-83PC60802
• OSTI ID: 5966470
• Report Number(s): DOE/PC/60802-10; ON: DE86005495
• Country of Publication: United States
• Language: English

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