为降低氧气高炉炼铁流程中循环煤气脱除CO2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 m3/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/m3,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3000 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 the CO2 removal and gas preheating cost during the oxygen blast furnace ironmaking pro-cess. The current study put forward an oxygen blast furnace with coke oven gas injection(OBF-COGI)ironmaking pro-cess. Then,the material and energy balances mathematical model of the new process was established. Based on the mod-el,the process parameters of traditional blast furnace(TBF),TBF-COGI,OBF(blast oxygen content of 30%,40%, 50%and 100%)-COGI were calculated and compared. The results show that a small amount(30 m3/t)of COGI into the TBF can reduce the fuel ratio 13 kg/t compared with TBF,COG replacement coke ratio is 0.433 kg/m3,but has little im-pact on the other parameters. With the increase of blast oxygen content,the reduction potential of OBF-COGI raises, the CO and hydrogen utilization rate decreases. There exists a reducing agent apparent excess in the furnace. There is no N2 enrichment phenomenon in the non full OBF-COGI process. The total calorific value of external supply gas gross in new process is 3000 MJ/t which has little change compared with the TBF. So the new process has almost no effect on the gas supply and demand balance in present iron and steel enterprise. Compared with the current blast furnace ironmaking process,the full OBF-COGI process can save coke by 43%,increase coal by 33%and reduce fuel ratio by 20%.
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