在氢气直接还原铁竖炉内氢气的利用率较低，故在竖炉上部增加吹氧装置来实现炉内物理能和化学能的最佳利用，提高氢气利用率。通过计算流体力学软件模拟氢气竖炉和吹氧竖炉还原段的温度场、气体分布，计算出炉内能量的消耗。结果表明，在还原段上部7 m处吹氧，每还原出1 t铁的吹氧量为26．78 Nm3，吹氧竖炉与氢气竖炉相比：氢气利用率提高33．43％，氢气用量减少22．08％，炉顶气还原势降低61．84％，能耗减少14．72％，吹氧周围及上部炉料温度有所升高。%It is quite low that the hydrogen utilization of 23% in the hydrogen⁃based DRI shaft furnace. A new process of oxygen blowing into the upper part of the furnace is proposed to make a proper match on physical and chemical energy and to improve the utilization of hydrogen.A CFD software is adopted to simulate the temperature field and the gas distribution of both hydrogen based shaft furnace and the oxygen blowing furnace. The energy consumption is calculated. The study results show that the hydrogen utilization in the oxygen blowing furnace has been increased by 33. 43% compared with the traditional hydrogen furnace with the oxygen consumption of 26. 78 Nm3/t iron at the height of 7m. Meanwhile the hydrogen consumption has been decreased by 22.08% the reduction potential of top gas has been decreased by 61.84% and the consumption of energy has been decreased by 14.72%. The temperature around the position of oxygen blowing in the upper part of the furnace has also been improved.
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