Title: Kinetics of ammonia formation and influence of charge crushing on coke-oven ammonia yields
Abstract: The recent tendency to reduce the degree of charge crushing has awakened new interest in the effects of coal particle size on the thermal degradation behavior. The specific behaviors of coal particles of different sizes are associated primarily with physical effects (changes in specific surface area, porosity and temperature conductivity), which can influence the caking process, the development of coke substance structures and the strength and other properties of the coke. N.S. Gryaznov has discussed the parts played by chemical interactions between the molecules in adjacent coal particles in plastic contact, with reference to the numbers of chemical bonds per unit contact surface area, which also depends on the total surface area, i.e., on the particle size. The collation of experimental data has brought out the considerable influence of coal particle size on the course of thermal degradation processes within the particles, with references both to the thermal degradation of the original macromolecules in the coal substance and the secondary thermal synthesis reactions. It is quite naturally to be expected that changes in the size of coal particles should have the greatest influence on processes that take place in the diffusion and diffusion-kinetic ranges. This article concerns the effects observedmore » in one series of reactions of this type, relating to the formation of coke-oven ammonia. It was concluded that: (1) The ammonia formation reactions during carbonization obey a diffusion-kinetic mechanism. (2) The ammonia yields from medium- to high-rank coals depends on the coal particle size.« less
Publication Year: 1981
Publication Date: 1981-01-01
Language: en
Type: article
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