材料期刊网

高炉大型化是炼铁发展的趋势,随着高炉炉缸直径的不断变大,中心不活跃区域越来越大,如何引导煤气到达炉缸中心已成为炼铁工作者关注的焦点。为了解决上述难题,通过建立炉缸煤气流动三维模型,应用CFX数值模拟软件计算煤气流速,分别研究了炉缸直径、焦炭粒径、空隙度以及鼓风动能对炉缸煤气流分布的影响。结果表明：即使炉缸内焦炭粒径及空隙度分布均匀,边缘煤气流速依然大于中心煤气流速,并且炉缸直径越大,中心煤气流越弱。炉缸内焦炭粒径和空隙度分布影响煤气流分布,提高炉缸中心焦炭粒径和空隙度有利于引导煤气到达炉缸中心。同时,为了保障高炉稳定顺行,鼓风参数必须和炉缸透气性协调一致,不能过于依靠提高鼓风动能吹透中心。

Blast furnace enlargement is the trend of ironmaking development.As the diameter of blast furnace hearth increasing,the inactive region in the centre of blast furnace hearth becomes larger.It is a focus of attention how to guide the gas into the centre for BF operators.Three-dimensional model of blast furnace hearth was established.The gas velocity was calculated by CFX numerical simulation software.The influence of hearth diameter,coke diameter,stock column voidage and kinetic energy of tuyeres on the gas flow distribution in blast furnace hearth was investigated using this model.The results show that when the coke diameter and voidage distribute uniformly,the gas velocity in the periphery is still higher than the center.As the diameter of blast furnace hearth increasing,the center will become much inactive.The coke diameter and stock column voidage play an important part on improving the permeability of blast furnace hearth.The kinetic energy of tuyeres is related with the coke diameter and stock column in blast furnace hearth.In order to guarantee the stability of blast furnace,the blast parameters must be set reasonable.Blowing through the centre of blast furnace hearth can not be achieved by increasing the kinetic energy of tuyeres.