O-17　Achievement of theoretical hydrogen consumption in Hydrogen Direct Reduction of Iron Ore

抄録

To decarbonize the steel industry, several studies have been conducted for developing the Hydrogen Direct Reduction of Iron ore (HDRI) route. The current study evaluates the energy and mass balance of HDRI for evaluating the more detailed energy consumption of the system and investigating the possibility of achieving a theoretical amount of hydrogen consumption per ton of liquid steel production. The target amount of liquid steel was set as 1 ton for defining the mass and energy values of HDRI. The calculations did not include hydrogen storage. As a result of energy and mass balance, HDRI needs 54.00 kg of H₂ for reducing 1,428.00 kg of Fe₂O₃ and production of 1 ton of liquid steel (tls). The condition of the experiment was decided as T=800°C, M_Fe2O3= 5g, M_H2=0.19g, P=0.015MPa, 15min of residence time. H₂ was used as a reducing agent and N₂ for evacuating air from the quartz tube. Condition of initial experiments without mass flow controller, viz., T=800°C, MFe₂O₃= 1g, M_H2=continuously during the residence time, P=0.015MPa, 15 min of residence time, M_N2= continuously during the experiment revealed the possibility of reduction of iron ore by hydrogen with 65% of the yield of reduction. Energy consumption of the system accounted for 2.68MWh without considering H₂ storage energy requirements.