Influence Factors of Gas Distribution in Blast Furnace Hearth

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.