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Synopsis:Penetration of the gas injected into blast furnace stack and its influence on iron are reduction was inves tigated by two and three dimentional cold model experiments and the theoretical consideration to predict it for the commercial furnace. Gas compositions and the coke replacement ratio were also investigated experimentally and theoretically when top recycled reforming process-NKG Process-was adopted. Very low nitrogen content in the injected gas will be possible if newly proposed method can be applied for the above process.(1) Gas penetration into furnace was mainly governed those three factors such as the injected gas ratio to the total gas passing through furnace U/(U+V), the radial eddy diffusion of the gas, and the radial distribution of burden.(2) Compositions of the top recycled material gas and injected gas can be calculated by fixing U/(U+V) and C/H ratio of reformed hydro carbon.(3) The top recycled material gas and the injected gas containing very low hydrogen can be obtained by taking out of the top gas periphery of the furnace throat.(4) The more amount of reducing gas is injected, the larger coke replacement ratio is predicted by the mathematical model calculation. When more than 400 Nm3/tHM of reducing gas is injected, 23 kg/100 Nm3 of the coke replacement ratio is expected by taking out of top gas periphery comparing with 17 kg/100 Nm3 by the conventional method.

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