高炉における各種還元材の還元性能評価指標

抄録

In blast furnace operation, reducing agent ratio (RAR) is an important index. The RAR is defined as only sum of weight, without considering the kind of reducing material. Here the author proposes a new reducing potential index, "ReP", which considers the difference of reducing material composition under the real blast furnace condition that gas utilization ratios (η_co, η_H2) are 50%. Namely, ReP is set as
C=3, H=0.5, O=–2, (N=0) (ReP/kmol).
This index evaluates reduction potentials of various reducing materials in a uniformed manner. Latter part of this report includes an example of blast furnace operation analysis using "ReP". Extended case studies which concern utilization of partially reduced ore, utilization of mixture of ferrous and carbonous materials, and gas utilization ratio changes far from 50%, are performed. When gas utilization ratios change from 50%, "ReP" is available if extended ReP is set as C=2+2η_co, H=η_H2, O=–2, (N=0) (ReP/kmol).