Abstract
In this paper, a mathematical model of the gas-solid flow, heat exchange and pulverized coal combustion in the region of blowpipe-tuyere-raceway bottom was established. The pulverized coal combustion behavior in the traditional blast furnace and oxygen blast furnace was investigated by CFD. The results indicate that the influence of reducing particle diameter and increasing oxygen content in traditional blast furnace on the increase of the burnout of pulverized coal is greater, 35.93% and 16.54% respectively. However, the influence of increasing blast temperature is smaller, 8.9%. Furthermore, the influence of increasing oxygen content on the pulverized coal combustion in oxygen blast furnace is small due to higher oxygen content. The influence of improving recycling gas temperature is not remarkable either. When the content of H2O and CO2 in cycle gas increases by 5% respectively, the highest temperature of gas combustion along tuyere axis reduces by 124 K and 113 K respectively.
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