Effect of Woody Biomass on Reduction Behavior of Iron Oxide
Satoshi Kogure, Kyohei Yokota, Tunehisa Nishimura, Kazuya Kunitomo, Jun Okazaki
CO2 emissions in steel works accounts for about 15% of those in Japan (2015), and most of those are from blast furnace iron-making process. To reduce CO2 emissions, utilization of woody biomass in blast furnace is considered. Woody biomass has the characteristic of carbon neutral and high reactivity. So CO2 emissions can be reduced by the use of woody biomass as coke substitution. High reactivity of reducing agent is expected to decline thermal reserve zone “Trz” temperature, which causes improvement of reaction efficiency in the blast furnace and lowering of reducing agent rate. To verify the effect of the use of woody biomass on thermal reserve zone temperature, we executed experiment to evaluate the effect of charcoal coexisting in the ore layer on reduction behavior of iron oxide with the adiabatic blast furnace inner reaction simulator (BIS). With heat and mass balance analysis, we evaluated the effect of declining Trz temperature on lowering of reducing agent rate and the effect of utilization charcoal as coke substitution on reducing CO2 emissions in blast furnace process.
As a result, charcoal lowered the Trz temperature and carbon consumption. We estimated that charcoal can reduce CO2 the amount of CO2 emissions 33%. So that, we think that charcoal can be used as coke substitution.
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