喷吹循环煤气氧气高炉的静态模型

A comprehensive static model for oxygen blast furnace with recycling gas injection

根据整体及各区域的物理化学约束条件建立了氧气高炉工艺综合数学模型.通过模型的计算结果对能量在不同区域的利用情况进行了分析.得出结论如下:氧气高炉无煤气循环流程的一次能耗很高,燃料比在600 kg/tHM以上,并且无法实现高温区和固体炉料区之间的能量匹配.炉顶煤气循环后,可以实现能量在高温区和固体炉料区的同时平衡;在同时满足全炉热平衡和区域热平衡的条件下,氧气高炉炉身喷吹循环煤气流程的理论燃烧温度过高,而炉缸喷吹循环煤气流程的理论燃烧温度偏低;对于氧气高炉炉身、炉缸同时喷吹循环煤气流程,随着循环煤气量的增大,焦比升高,煤比降低,理论燃烧温度可以维持在合理的范围内.

By taking physical and chemical constraint conditions of different zones into consideration,based on material balance and energy balance,a comprehensive mathematical model of oxygen blast furnace(OBF) process was established.Utilization of energy in different zones was analyzed according to the calculated results.Theoretical analysis and calculation results show that the fuel consumption of OBF process without gas recycling is over 600 kg/tHM,which can not realize the energy matching between high temperature zone and solid burden zone,after recycling top gas,the problem of energy matching can be solved;The adiabatic combustion temperature of OBF process with gas recycled from shaft is too high and the adiabatic combustion temperature of OBF process with gas recycled from hearth is a little low when the energy balance in whole furnace and different zones are both fulfilled;For OBF process with gas recycling from shaft and hearth,with the increasement of gas recycling,the coke increases and the coal decreases,meanwhile the adiabatic combustion temperature can be maintained in a reasonable range.