Abstract
Theoretical study was made to search an effective use of oxygen in the blast furnace with a one-dimensional blast furnace mathematical model and following results were obtained.
1) The straight use of oxygen in the blast will result in the increase of the fuel rate because of the lack of heat at the furnace shaft caused by the excessive increase of the flame temperature.
2) The use of oxygen with the combined use of the pulverized coal in large quantities is reasonable to restrain the excessive increase of the flame temperature and both the low fuel rate and the high productivity will be achieved without any other measures such as the hot gas injection into the furnace shaft.
