CALCULATION AND ANALYSIS THE INFLUENCE ON THE COOLING WATER VELOCITY AND HOT METAL CIRCULATION TO THE LONG LIFE BF

摘要

Based on the result of the blast furnace dissection and the optimization of hearth heat transfer boundary conditions, the hearth heat transfer mathematical model was established, and then the equivalent heat transfer coefficient of hot metal was proposed, which characterized the iron circulation strength. The dynamic conditions which promoted the viscous layer formation on the brick lining heat face was analyzed. Reducing smelting intensity was the most significant measure which was quantitately pointed out. The smelting rhythm should be controlled in the condition of blast furnace intensification. The hearth reasonable requirement of critical water velocity was given, that was, the cooling water body temperature should be below the water quality stability temperature and the pipe wall temperature of the boundary layer should be under the cooling water boiling temperature. According to the given condition, the water velocity of the hearth should be greater than 1.2m/s.