The effect of pulverised coal injection in blast furnace using computer simulation technique
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A computer model simulates the effect of different types of coals on blast furnace operations. In this study, two kinds of programs, CHEMIX and ESTIMA as parts of a thermochemistry package known as THERMOCHEMISTRY were used for checking the adiabatic flame temperature. Results showed that the adiabatic temperature decreased considerably as the pulverized coal injection (PCI) rate increased, with the rate of decrease largely dependent on the chemical properties of the coal-mainly the carbon content and calorific value. The coal with the least carbon content has the least effect on the flame temperature. However, the coal/coke replacement ratio is very low. PCI increases the rate of generation of the reducing gases, namely CO(g) and H2(g), which depend largely on the chemical properties of coal. The results suggest that a simple calculation using computing programs may be useful for determining the suitability of a coal for injection in blast furnaces.
Key wordsthermochemistry blast furnace pulverized coal injection
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