Based on the stoichiometric method and the free energy minimization method, an ideal model for the reduction of iron oxides by carbon and hydrogen under blast furnace conditions was established, and the reduction efficiency and theoretical energy consumption of the all-carbon blast furnace and the hydrogen-rich blast furnace were compared. The results show that after the reduction reaction is completed at the bottom of the blast furnace, the gas produced by reduction at 1600 °C still has a certain excessive reduction capacity, which is due to the hydrogen brought in by the hydrogen-rich blast as well as the excess carbon monoxide generated by the reaction of the coke and the oxygen brought in by the blast. During the process of the gas with excessive reduction capacity rising from the bottom of the blast furnace and gas reduction process, the excessive reduction capacity of the gas gradually decreases with the increase in the dydrogen content in the blast. In the all-carbon blast furnace, the excess gas reduction capacity is the strongest, and the total energy consumption per ton of iron reduction is the lowest. This shows that, for the current operation mode of the blast furnace, adding hydrogen in the blast furnace cannot reduce the consumption of carbon required for reduction per ton of iron, but rather increases the consumption of carbon.

基于化学计量法和自由能最小化法，建立了高炉条件下碳氢还原铁氧化物的理想模型，并计算了全碳高炉和氢气的还原效率和理论能耗。富高炉进行了比较。结果表明，高炉底部还原反应完成后，1600℃还原产生的气体仍具有一定的过量还原能力，这是由于富氢鼓风带入的氢气为以及焦炭与爆炸带来的氧气反应产生的过量一氧化碳。过量还原能力煤气从高炉底部上升及煤气还原过程中，随着鼓风中氢气含量的增加，过量还原能力逐渐降低。全碳高炉中，过剩煤气还原能力最强，吨铁还原总能耗最低。这说明，对于目前高炉的运行方式，高炉加氢并不能减少吨铁还原所需的碳消耗，反而增加了碳的消耗。