富氧高炉综合模型

针对高富氧操作中出现的“上冷下热”问题，考虑高炉正常冶炼所需的必要条件，建立了对高温区和低温区分别计算物料和热量平衡的数学模型，用于研究高炉内热状态随富氧率的变化和相应的对策.本文描述了模型的建立过程，并通过与生产数据的对比证明了模型的有效性.基准算例条件下的计算结果表明:富氧提高1%，炉顶煤气温度下降约14℃;对于富氧率为1.7%的高炉操作，在不采取额外措施时仍能确保高温区和低温区的热量平衡.另外，计算得到的理论最低直接还原度与实际生产直接还原度的差异表明当前高炉冶炼仍具有继续降低燃料比的可能性.

Integrated Model of Oxygen-Enriched Blast Furnace

Aiming to solve the problem of “hot lower part and cool upper part” in blast furnace with oxygen enrichment blowing， this work has developed a model considering necessary conditions in practice to calculate the heat balances of both the high- and low-temperature zones respectively. The model is expected to study the variation of thermal state of blast furnace and the possible corresponding countermeasures in oxygen enrichment blowing operation. This paper describes the process of model development and validation through comparing with practical production data. The result under conditions of the base case shows that， when oxygen enrichment ratio increases by 1%， the top gas temperature decreases by 14℃. For the operation with an oxygen enrichment rate of 1.7%， the heat balances of both high-and low-temperature zones can be ensured with no additional countermeasures. Besides， the difference between the theoretical minimum direct reduction degree calculated by this model and the reduction degree acquired in practice proves that there is still some room to further reduce the fuel rate in blast furnace ironmaking.