Medium oxygen-enriched blast furnaces that utilize reducing gas injections are a feasible new ironmaking process that can significantly reduce the coke ratio and carbon dioxide emissions. To better inject the reducing gas into the blast furnace, two injection methods were designed in this study, and the effects of the reducing gas on the combustion of pulverized coal in three types of medium oxygen-enriched processes were studied using a three-dimensional lance-blowpipe-tuyere-raceway model. The reducing gas was injected into the blowpipe from a sleeve spray lance, which was suitable for injecting a small amount of reducing gas. The optimal coal burnout was 6% higher than that of a traditional blast furnace (TBF). The reducing gas was also directly injected into the raceway from a spray lance, which was suitable for injecting a large amount of reducing gas. The optimal coal burnout was 13% higher than that of a TBF using this system.

利用还原性气体注入的中等富氧高炉是一种可行的新炼铁工艺，可以显着降低焦炭比和二氧化碳排放量。为了更好地将还原气注入高炉，本研究设计了两种注入方式，利用三维喷枪研究了还原气对三种中等富氧工艺中煤粉燃烧的影响。 -吹管-风口-滚道模型。还原气体从套筒喷枪注入吹管，适用于喷射少量还原气体。最佳燃煤率比传统高炉 (TBF) 高 6%。还原气体也从喷枪直接注入滚道，适用于注入大量还原气体。最佳燃煤燃尽率比使用该系统的 TBF 高 13%。