高炉喷吹煤粉是降低焦比的重要手段。近年来部分高炉的喷煤粉量高达200kg／t。喷入高炉内的煤粉大部分在循环区内燃烧，但是随着煤粉喷吹量的增加，煤粉不能完全燃烧，未燃烧煤粉堆积在高炉内使透气性变差，并且给高炉煤气清洗系统带来不良影响，所以提高煤粉在循环区内的燃烧 Pulverized coal injection blast furnace is an important means to reduce the coke ratio. In recent years, some blast furnace coal powder up to 200kg / t. Most of the pulverized coal injected into the blast furnace burns in the recirculation zone, but as the amount of pulverized coal injection increases, the pulverized coal can not be completely combusted, the unburned pulverized coal accumulates in the blast furnace to deteriorate the air permeability and gives blast furnace gas Cleaning system to bring adverse effects, so improve the combustion of pulverized coal in the recycling area