| 摘要 |
PURPOSE:To prevent the growth of a bird nest around a raceway and to prevent the degraded air permeability in the lower part of a blast furnace by blowing a basic pulverized fluxing agent simultaneously with blowing of pulverized coal into the blast furnace. CONSTITUTION:The basic pulverized fluxing agent such as pulverized dolomite is blown simultaneously with blowing of the pulverized coal into the blast furnace from tuyeres 1 thereof. As a result, cope, ash of pulverized coal and dolomite are assimilated in the raceway 2, by which low-viscosity slag is formed and smoothly dropped. The thickness of the bird nest 3 is thereby decreased and the stable raceway shape is maintained and therefore, the effect of improving the air permeability is expected. |
