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结合风口回旋区燃烧和炉外煤气预热、脱除和循环的平衡关系,建立了氧气高炉一维气固换热与反应动力学模型,并采用传统高炉的运行和解剖数据对模型进行了验证分析.通过模型研究了氧气含量和上部循环煤气流量对氧气高炉炉内过程变量的影响规律.结果表明:氧气含量偏低和上部循环煤气流量不足时,会降低铁矿石还原效果,炉渣内出现大量未还原铁氧化物;氧气含量和上部循环煤气流量的提高可以有效提高炉内CO含量和铁矿石还原速度,但提高上部循环煤气流量会大幅提升炉顶煤气温度,增大热量损失.与传统高炉相比,氧气高炉内CO含量提高1.0~1.5倍,炉内气体还原性更强;铁矿石还原完成位置提高1.49 m,全炉还原反应速度更快;直接还原度降低55.2%~79.2%,炉内直接还原反应消耗的碳量更少.
Combining the combustion in the tuyere and the balance between preheating, desorption and circulation of gas outside the furnace, a one-dimensional gas-solid heat exchange and reaction kinetics model of oxygen blast furnace was established, and the model was verified by the operation and anatomical data of the traditional blast furnace The influence of oxygen content and upper circulated gas flow rate on the process variables in the oxygen blast furnace was studied by the model.The results show that when the oxygen content is low and the upper circulated gas flow rate is insufficient, the reduction effect of iron ore will be reduced, A large amount of non-reduced iron oxide; the increase of oxygen content and upper circulating gas flow can effectively increase the CO content and iron ore reduction rate in the furnace, but increasing the upper circulating gas flow will greatly increase the top gas temperature and increase the heat loss. Compared with the traditional blast furnace, the content of CO in oxygen blast furnace increased by 1.0-1.5 times and the gas in the furnace was more reducible; the reduction position of iron ore was increased by 1.49 m, the reduction rate of the whole furnace was faster; the direct reduction degree was reduced by 55.2% -79.2 %, The direct reduction of the furnace consumes less carbon.