材料期刊网

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。

The energy-saving potential for different low carbon ironmaking approaches was investigated facing to the given conditions of materials.The result shows that for the general BF,when the indirect reduction approaches to the chemical balance,the gas utilization can reach up to 56.99% and fuel ratio is decreased by 28.37 kg/t.For oxygen blast furnace,when the top gas is totally recycled the fuel ratio can be reduced to 385.6 kg/t.The fuel ratio can also be reduced through the injection of coke oven gas.About 5.0 kg/t coke ratio can be saved by every 10 m3 COG injection.Along with the oxygen enrichment being improved,the optimal injection volume corresponding to the minimal fuel ratio increases and as a result the lowest fuel ratio decreases.When the oxygen enrichment is 6%-8% and injection volume is 160-180 m3/t.the coke ratio can be reduced maximally by 53-54 kg/t.Using high reactivity coke in blast furnace can decrease temperature of thermal reservation zone and the balance concentration of CO decreases accordingly.When the balance concentration of CO is decreased by the step of 2.5% from 70%-60%,the fuel ratio can be reduced by 10.30-12.20 kg/t theoretically and the reducing rate decreases.