Combustion of Pulverized Fuel—Mechanism and Rate of Combustion of Low-Density Fractions of Certain Bituminous Coals

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Abstract
In the course of the investigation reported in this paper, individual particles of burning coal were studied, using all convenient means of observing the burning process and examining the residues which might be obtained. Using Pittsburgh seam coal and Pocahontas No. 3 seam coal, it was found that the particles were blown into cenospheres before they ignited. The exposures just required to make an impression on the photographic film were used to estimate the temperature history of individual particles. With the available furnace temperatures, less than 1000 C, the degree of combustion depended upon the ability of the particles to maintain themselves above about 1400 C. The degree of combustion increased with increasing furnace temperature in the region where the cenospheres were formed. Photographs of partially burned cenospheres and data on the relation of particle size to burning time were obtained.

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