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为降低氧气高炉炼铁流程中循环煤气脱除CO_2及煤气预热成本,提出了氧气高炉喷吹焦炉煤气炼铁流程,并建立了新流程能质平衡数学模型,应用该模型分别对传统高炉、传统高炉喷吹焦炉煤气、氧气高炉(鼓风氧体积分数为30%、40%、50%、100%)喷吹焦炉煤气炼铁流程主要技术参数进行计算并对比。结果表明,传统高炉喷吹少量焦炉煤气(30 m~3/t)可降低燃料比13 kg/t,焦炉煤气置换焦炭的置换比为0.433 kg/m~3,但是对其他参数影响不大。氧气高炉喷吹焦炉煤气流程随着富氧率提高,炉内还原势提高,CO和氢利用率下降,炉内存在还原剂表观过剩,非全氧鼓风条件下炉内没有发生氮气富集。新流程外供煤气总热值为3 000 MJ/t左右,与传统高炉相比变化不大,对现有钢铁联合企业煤气供需平衡影响较小。全氧高炉喷吹焦炉煤气炼铁流程相较于目前的高炉炼铁流程可节焦43%,增煤33%,总燃料比降低20%。
In order to reduce CO_2 and gas preheating cost, the oxygen blast furnace blast furnace coke oven gas ironmaking process was proposed and a mathematical model of new process energy balance was established. The model was applied to the traditional blast furnace , And the main technical parameters of the blast furnace coke oven gas and oxygen blast furnace (blowing oxygen volume fraction of 30%, 40%, 50%, 100%) in the blast furnace were compared and calculated. The results show that the conventional blast furnace injection of a small amount of coke oven gas (30 m 3 / t) can reduce the fuel ratio of 13 kg / t and the replacement ratio of coke oven gas replacement coke is 0.433 kg / m 3, but the impact on other parameters Big. Oxygen Blast Furnace Coke Oven Gas Flow As the oxygen enrichment rate increases, the reduction potential in the furnace increases, the CO and hydrogen utilization rates decrease, and there is an apparent surplus of the reductant in the furnace. No nitrogen enrichment occurs in the furnace under non-full oxygen blast conditions set. The gross calorific value of the gas supplied by the new process is about 3 000 MJ / t, which shows little change compared with the traditional blast furnace, and has little impact on the gas supply and demand balance of the existing steel and coal enterprises. Oxygen blast furnace blast furnace coke oven gas ironmaking process compared to the current blast furnace ironmaking process can be coke 43%, by 33% of coal, the total fuel ratio decreased by 20%.