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针对目前熔融还原设备无法将煤气二次燃烧氧化区与铁氧化物还原区隔离而导致能耗偏高的问题,提出了一种两步三段式厚渣层铁浴熔融还原炼铁工艺,以期利用厚渣层冶炼的方法使得氧化区与还原区的梯度隔离。设计了主反应器铁浴炉尺寸与产能,并建立了工艺的整体静态模型,考察了球团金属化率与铁浴炉炉顶煤气氧化度对工艺煤耗、氧耗以及能耗的影响。在选定的适宜操作参数,即煤气氧化度55%,球团金属化率80%条件下,冶炼1t铁水,消耗球团矿1 869.83kg,煤粉674.07kg,同时得到还原度71%的改质煤气898.44kg。结合反应器的设计产能,反应器可处理球团矿3 793.66kg/(h·m2)。
In view of the fact that the smelting reduction equipment can not isolate the secondary combustion oxidation zone from the iron oxide reduction zone and lead to high energy consumption, a two-stage and three-stage smelting reduction process is proposed, Slag layer smelting method makes the oxidation zone and the reduction zone gradient isolation. The size and capacity of the main reactor iron bath furnace were designed and the overall static model of the process was established. The effects of the metallization rate of the pellet and the oxidation degree of the top gas of the iron bath furnace on the process coal consumption, oxygen consumption and energy consumption were investigated. In the selected appropriate operating parameters, namely the degree of oxidation of 55% of the gas, the pellet metallization rate of 80% under the conditions of 1t molten iron smelting, consumption of pellets 1 869.83kg, 674.07kg of pulverized coal, while reducing the degree of 71% of the change Quality gas 898.44kg. Combined with the design capacity of the reactor, the reactor can handle pellets 3 793.66kg / (h · m2).