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首页> 外文期刊>ISIJ International >The Reduction of Wustite with High Oxygen Enrichment and High Injection of Hydrogenous Fuel
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The Reduction of Wustite with High Oxygen Enrichment and High Injection of Hydrogenous Fuel

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In order to reduce CO_2 emission and energy consumption in a blast furnace, it is necessary to investigate the effects of some factors on direct reduction from wustite (FeO) to iron(Fe) with high oxygen enrichment and high injection of hydrogenous fuel, such as the composition and temperature of reducing gas mixture and the water-gas shift reaction. The current experiments reveal: (1) Reducing power of gas mixture with low oxygen enrichment and high PCI injection is limited, the reduction degree of wustite is 53.6 percent after 90min at 1 000 deg C; While with high oxygen in blast (40 percent) and high natural gas injection (about 15 percent H_2 in hearth gas), the reduction degree reaches 100 percent after 64.81 min. In the case of reduction with pure oxygen and higher hydrogen, the reduction speed promotes further. At 900 deg C, 100 percent reduction needs 64 min. (2) The utilization efficiency of hydrogen drops when H_2 content is over 50 percent in the gas mixture without N_2. The optimum value of H_2 content for pure oxygen blast furnace is between 15-30 percent from the point of view of wustite reduction. (3) The water-gas shift reaction counteracts wustite reduction in the case of gas mixture with high content of CO_2 and H_2 at elevated temperature.

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