Operating System of 2922 m3 BF under High Rate of Pellets in Tangshan Steel New District
An operating system is explored in No.1 2922m3 BF of Tangshan Steel New Area with pellet rate increasing from 19.5％to 31％,and the result shows that the BF production under high pellet rate greatly influences the gas flow distribu-tion.After over a year of exploration operation,these furnaces successfully produce hot metal under above 40％of pellets.The main operating experience suggests that the pellet rate should be increased step by step according to the furnace condition other than sharp increasing groundlessly;when adjusting the charging system,efforts shall be made to stabilize the edge gas flow and ensure the central gas flow,and the edge gas flow shall be enhanced appropriately in case of any trace of wall accre-tion,so as to avoid great adjustment of the charging system;when the central gas flow become small and the hearth condition deteriorates,the tuyere area should be reduced to ensure over 255 m/s blasting speed for higher blast kinetic energy;[Si]content of hot metal should be controlled at 0.3％-0.4％,and the slag alkalinity should be kept at 1.15-1.20 to ensure stable and smooth running of the furnace.
blast furnacehigh pellet ratebasic pelletsgas flow distributionoperating system
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