Abstract The change regulations of the smelting parameters in a gas-injection blast furnace are investigated using theoretical calculations. The results show that when the volume of gas injected, the oxygen enrichment rate and the theoretical combustion temperature of tuyere are 600 m3/tHM, 10% and 1950~2200∘C, respectively, the conditions meet the smelting requirements of a blast furnace. With the increase of the oxygen enrichment rate, the required air volume decreases, the contents of CO and H2 in the top gas increase, and the content of CO2 first increases and then decreases.With an increase of the volume of gas injected, the coke rate decreases. In addition, when the oxygen enrichment rate and the volume of gas injected are 10% and 600 m3/tHM, respectively, the CO content of the top gas constantly increases with the increase of the coke rate, while the H2 and CO2 contents both decrease. With the increase of the H2 content in the gas, the direct reduction degree of iron gradually decreases and the volume shrinkage burden increases. Apparently, injecting gas into the blast furnace can prevent the theoretical combustion temperature from being too high and solve the contradiction between the upper cooling and lower heating of the blast furnace.

中文翻译：

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喷气高炉适宜生产参数的研究

摘要 通过理论计算研究了喷气高炉冶炼参数的变化规律。结果表明，当注气量、富氧率和风口理论燃烧温度分别为600 m3/tHM、10%和1950~2200∘C时，条件满足高炉冶炼要求。随着富氧率的增加，所需空气量减少，炉顶气中CO和H2的含量增加，CO2的含量先增加后减少。随着注气量的增加，焦炭率下降。此外，当富氧率和注气量分别为 10% 和 600 m3/tHM 时，炉顶气 CO 含量随着焦化率的增加而不断增加，而 H2 和 CO2 含量均下降。随着气体中H2含量的增加，铁的直接还原度逐渐降低，体积收缩负荷增加。显然，向高炉内注气可以防止理论燃烧温度过高，解决高炉上冷下热的矛盾。