Abstract
The co-combustion of semicoke and coal is recognized as a promising method for ironmaking blast furnace operation to reduce energy consumption and decrease the cost of hot metal. It is imperative to investigate the co-combustion behaviors and the in-furnace characteristics when injecting high ratio semicoke into blast furnace. Therefore, a three-dimensional model including tuyere and raceway for the injection of both semicoke and coke breeze with the actual operational parameters of a blast furnace was established. The model is then used to investigate the effects of oxygen enrichment ratio, injection amount and particle size on the combustion characteristics in the tuyere and raceway. Results showed that the high temperature zones expanded significantly with the increase of the oxygen enrichment ratio while they shrunk with the increase of the injection amount and the particle size. In order to obtain a higher burnout rate and a smooth operation of blast furnace, it is suggested that the oxygen enrichment ratio should be increased, the injection amount of semicoke and coal should not exceed 180 kg/t under the current working condition and the particle size of semicoke and coke breeze should be smaller than 60 µm.
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