放宽高炉喷吹煤粉粒度的工业实验

Industrial Experiment with Roughter Pulverized Lean Coal in BF

摘要: 在安钢炼铁厂1#高炉喷吹瘦煤时进行了煤粉粒度放宽的工业试验.将小于74μm(-200目)的比例由70%放宽到30%后,磨煤能力提高了21%.采用粒度较粗的煤粉,风口前循环区变长,煤粉的置换比和喷煤比都有所提高,置换比和喷煤比提高的程度随富氧率升高而增加,使高炉生产效益有了一定的改进.

Abstract: An industrial experiment with rougher pulverized lean coal was carried out in 1# BF at Anyang Iron and Steel Group Co. The production of coal grinders increased by 21% as the mixing rate of the pulverized coal size under 74 um was reduced from 70% to 30%. With rougher pulverized coal, the raceway became longer and the PCI ratio as well as replacement ratio of coal enhanced. The two ratios increased as the oxygen was enriched. It is shown that much good economical benefit in BF has been reached by using rougher lean pulverized coal.