Shaft gas injection is considered helpful for realizing an oxygen blast furnace (OBF) to mitigate CO₂ emissions substantially. This paper presents a systematic study of the shaft injection for a 430-m³ industrial OBF using a process model. The OBF is operated at 35, 50, or 100 pct oxygen enrichment. It is combined with the reducing gas injection through blast tuyeres to achieve a reasonable flame temperature. The effects of shaft gas injection rate, shaft gas injection position, and shaft gas injection temperature are studied with fixed hot metal temperature, bosh gas volume, and flame temperature. The results show that the fuel rate decreases as the oxygen enrichment increases. It also decreases with increasing shaft gas injection rate/temperature but increases at a higher injection position. All these changes slow down when the values of the three variables are relatively large. At a higher oxygen enrichment or lower shaft gas injection position/rate, the replacement ratio of coke by the shaft injected gas increases, indicating better utilization of shaft gas energy. However, the replacement ratio increases first to a maximum and then gradually decreases with increasing shaft gas injection temperature, identifying an optimum injection temperature. The inner flow and thermochemical behaviors of OBF are analyzed in detail. It shows that the fuel reduction by shaft injection is a collected effect of decreased carbon consumption by raceway combustion and direct reduction. The former contributor plays a dominating role, benefiting from the pre-heating effect. The latter contributor results from the indirect reduction enhancement because of the intensified reducing atmosphere and increased temperature. These pre-heating and pre-reduction roles are quantified to elucidate the impacts of the flow rate, position, and temperature of shaft injection.

井筒气体注入被认为有助于实现氧气高炉 (OBF) 以显着减少 CO ₂排放。本文对 430 米^{3井筒注入系统进行了系统研究。}使用过程模型的工业 OBF。OBF 在 35、50 或 100 pct 富氧条件下运行。它与通过鼓风口的还原气体喷射相结合，以达到合理的火焰温度。在固定铁水温度、炉腹气体体积和火焰温度的情况下，研究了竖井注气速度、竖井注气位置和竖井注气温度的影响。结果表明，燃料速率随着富氧量的增加而降低。它也随着竖井气体注入速率/温度的增加而降低，但在较高的注入位置处增加。当三个变量的值相对较大时，所有这些变化都会减慢。在较高的富氧或较低的竖井气体注入位置/速率下，竖井注入气体对焦炭的置换率增加，表明更好地利用了竖井气体能量。然而，随着井筒气体注入温度的升高，置换比首先增加到最大值，然后逐渐降低，从而确定了最佳注入温度。详细分析了OBF的内部流动和热化学行为。它表明，轴喷射燃料减少是滚道燃烧减少碳消耗和直接减少的综合效果。前者的贡献者占主导地位，受益于预热效应。后一个贡献者是由于还原气氛增强和温度升高而导致间接还原增强的结果。这些预热和预还原作用被量化，以阐明轴注射的流速、位置和温度的影响。