论文部分内容阅读
实验室和生产高炉的研究发现,铁矿石的还原过程明显存在两个速度高峰,它把高炉内部分为上部高级氧化铁还原区、中部还原反应迟钝区和下部浮士体还原区等三部分。其中浮士体还原区还包括自热储备区下端到矿石熔滴以前(约950℃—1400℃甚至更高)的混合还原区与滴下带内的液态直接还原区。由固体浮士体间接还原和焦炭溶损反应组成的混合还原区是高炉内能量利用的关键区域,只有改善矿石还原性,降低焦炭反应性以增加该区内的间接还原量,才能降低高炉燃耗。上部高级氧化铁的间接还原虽可提高煤气利用率,但不能降低燃料比。位于热储备区的还原迟钝区是浮士体的潜在还原区。喷吹含氢高的辅助燃料、改善矿石还原性、提高鼓风温度和含氧量等可以挖掘该区的还原潜力,进一步降低高炉的燃科消耗量。
Laboratory and blast furnace research found that iron ore reduction process obviously there are two peaks in speed, which divided the blast furnace into the upper part of the high iron oxide reduction zone, the central slow reaction zone and the lower part of the reduction zone of the rest area . Among them, the reduction area of the fusions also includes the mixed reduction zone and the liquid direct reduction zone in the dropping zone from the lower end of the hot reserve to the ore droplet (about 950 ° C-1400 ° C or higher). The mixed reduction zone composed of the indirect reduction of solid floats and the coke loss reaction is the key area for energy utilization in the blast furnace. Only by improving the ore reduction and coke reactivity to increase the indirect reduction in the zone, Consumption Indirect reduction of the upper advanced iron oxide can improve gas utilization, but can not reduce the fuel ratio. The retarded zone located in the thermal reserve is a potential reduction zone for the float. High-hydrogen-containing auxiliary fuel is injected to improve ore reducibility, increase blast temperature and oxygen content to tap the potential for reduction in this area and further reduce the burn-in consumption of the blast furnace.