Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
On the Top Gas Recycled Reforming Process and the Injected Gas Distribution
Hiroaki NishioTsuneo MIYASHITA
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1973 Volume 59 Issue 12 Pages 1506-1522


Penetration of the gas injected into blast furnace stack and its influence on iron are reduction was investigated by two and three dimentional cold model experiments and the theoretical consideration to predictit for the commercial furnace. Gas compositions and the coke replacement ratio were also investigatedexperimentally and theoretically when top recycled reforming process-NKG Process-was adopted. Verylow nitrogen content in the injected gas will be possible if newly proposed method can be applied for theabove process.
(1) Gas penetration into furnace was mainly governed those three factors such as the injected gas ratioto the total gas passing through furnace U/(U+V), the radial eddy diffusion of the gas, and the radial distri-bution 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 obtainedby 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 themathematical model calculation. When more than 400 Nm3/tHM of reducing gas is injected, 23 kg/100Nm3 of the coke replacement ratio is expected by taking out of top gas periphery comparing with 17 kg/100Nm3 by the conventional method.

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