Combustion of coke particles in the tuyere hearth is modeled taking into account Stephan flow, kinetics of oxidation and carbon gasification reactions, homogeneous oxidation reaction of carbon monoxide, turbulent heat and mass transfer and radiation heat transfer. Coal dust is blown by flow of hot oxygen-enriched air. Dependences are obtained, which allow to estimate the effect of coal dust mass concentration, coal particle size, temperature and mass fraction of oxygen in the air on mechanical burn-out, oxygen zone length and the gas composition. When choosing the optimum ratio between the particles diameter and the mass flow rate should be guided by a factor of excess oxygen in the feed mixture equal to 1.1-1.2.
Effect of ash content in coal dust on the burning characteristics in tuyere zone of blast furnace is studied. The ash is considered as an individual fraction in addition to two fractions of coal dust. It is shown, that the variation of pulverized coal fractional composition allows increase of carbon monoxide yield and fuel particles burnout. The presence of ash results in oxygen zone extension and increase of coke residue burnout. At the same time the total coal dust burnout is lower than that of low-ash coal. Fine pulverized coal combustion is characterized by increased production of carbon monoxide and reduction of carbon dioxide percentage.
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