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从分析目前高炉炼铁碳消耗的本质出发,针对给定的原燃料条件,利用模型计算分析了当前主要低碳炼铁途径的节碳潜力。结果表明:对于普通高炉而言,间接还原达到平衡时的煤气利用率为56.99%,降低燃料比28.37kg/t。氧气高炉炉顶煤气完全循环利用条件下,最低燃料比为385.6kg/t。喷吹焦炉煤气可以降低燃料比,每增加10m3喷吹量,可降低焦比5.0kg/t左右;此外喷吹量存在极值,随着富氧率提高,获得最低燃料比的喷吹量增大,且最低燃料比降低。最佳喷吹条件为富氧率6%～8%,喷吹量160～180m3/t,可节约焦比53～54kg/t。使用高反应性焦炭可以降低热储备区温度,使间接还原平衡时CO浓度降低,平衡CO浓度从70%～60%,每降低2.5%,理论上可降低燃料消耗10.3～12.2kg/t,且降低幅度逐渐减小。
Based on the analysis of the essence of the current carbon consumption in blast furnace ironmaking, the carbon-saving potential of the current main low-carbon ironmaking route is calculated and calculated by using the model for the given raw fuel conditions. The results show that for the ordinary blast furnace, the gas utilization rate at the time of indirect reduction reaches 56.99%, and the fuel ratio is reduced to 28.37kg / t. Oxygen blast furnace top gas fully recycle conditions, the minimum fuel ratio of 385.6kg / t. Coke oven gas can reduce the fuel ratio, with each increase of 10m3 injection, can reduce the coke ratio about 5.0kg / t; In addition there is an extreme value of injection, with the rate of oxygen enrichment, to obtain the lowest fuel injection ratio Increases, and the minimum fuel ratio decreases. The best injection conditions for oxygen enrichment rate of 6% to 8%, injection volume of 160 ~ 180m3 / t, can save coke 53 ~ 54kg / t. The use of high reactivity coke can reduce the temperature of the thermal reserve so as to reduce the concentration of CO during the indirect reduction and equilibrium and reduce the fuel consumption by 10.3-12.2kg / t theoretically for a balanced CO concentration from 70% to 60% for every 2.5% reduction Decrease gradually reduce.