Effect of the Change in Operating Conditions on the Static Characteristics of Blast Furnace

Abstract

On the basis of blast furnace (A), the changes of the production rate of pig iron and the carbon ratio caused by the change of the operating conditions, such as top gas pressure, average diameter of iron ores, blast volume, blast temperature, ratio of steam injection and ratio of oxygen enrichment, have been determined with the aid of the mathematical model of a blast furnace which was developed hitherto. Results obtained by use of digital computer (HITAC 5020E) are illustrated in Figs.1-9
The production rate of pig iron increases with the increase in pressure of top gas, blast temperature, ratio of steam injection and ratio of oxygen enrichment, but the rate of the increase in production rate of pig iron for decreases with the increase in these operating factors. It is found that there is a similar tendency of the effect of the decrease in diameter of iron ores. The carbon ratio decreases with increase in top gas pressure, blast temperature and ratio of steam injection, but its variation is little in the lower region of the oxygen enrichement and increases with the oxygen enrichment in the upper region.
For blast volume, the production rate of pig iron and the carbon ratio increase in proportion to the increase in the blast volume.