The Influence of Combustor Operation on Fine Particles from Coal Combustion

Combustion Aerosols: Factors Governing Their Size and Composition and Implications to Human Health

“…58,59 As shown by eqs 8 and 9, the number and size of particles can be determined for n 0 kt >> 1 if the amount of material in the form of the aerosol is known. When f v is measured from the total amount of submicron ash collected, good agreement is observed between theory and experiment, both for the particle size distribution of the submicron ash 55 and the dependence of the mean particle diameter on f v . 22 The value of f v for the mineral matter is determined by the vaporization kinetics, and is a function of temperature and environment to which the minerals are exposed.…”

“…The evolution of particles following these approximate equations has been demonstrated in small-scale studies of aerosols formed from combustion systems for fly ash from coal 22,54,55 and soot particles 30,56,57 and waste combustors. 58,59 As shown by eqs 8 and 9, the number and size of particles can be determined for n 0 kt >> 1 if the amount of material in the form of the aerosol is known.…”

“…The suboxides and metals will diffuse through the particle boundary layer into the bulk gas where they are oxidized and condense to produce the submicron aerosols. The vaporization rate is strongly temperature-dependent 55,[62][63][64] so that the amount of submicron aerosol will vary with combustion conditions. The vaporization of elements is complicated by their interaction with the minerals in the coal.…”

Effect of Coal Type and Residence Time on the Submicron Aerosol Distribution from Pulverized Coal Combustion

“…McElroy and Carr (1981) found that combustion conditions that reduced NO, emissions (staging) also tended to suppress the generation of fine submicron particulate matter. Slrnilarly, Taylor and Flagan (1982) found a positive correlation between NO, concentration and submicron aerosol production. While their conclusions may seem inconsistent with the results presented here, their data were taken during combustion of eastern, high-sulfur bituminous coal and western, low-sulfur subbiturninous coals.…”

“…Taylor (1980, 1981) and Taylor and Flagan (1982) have used such a system to study the effects of burner design on the formation of submicrometer aerosols. Abele et al (1980) studied the effect of coal type, particle size, and combustion conditions on the rate of SO, formation and the fly-ash distribution from the combustion of various bituminous coals.…”