Abstract The gas-injection blast furnace (BF) is a new iron-making technology with an injecting gas instead of traditional pulverized coal injection (PCI) and recycling of the BF top gas through a gasifier. In contrast to traditional all-coke and PCI BFs, the coke rate will depend mostly on the heat consumption in a gas-injection BF with abundant injected gas, which results in a large coke-saving potential. Based on energy conservation, carbon recycling, CO2 abatement and fuel cost, the degree of direct reduction should be between 0.2 and 0.3. In addition, in terms of the effects of the gas injected and the rich oxygen rate in the tuyere region, the optimum injection parameters were obtained, which can reduce the coke rate to 273.36 kg/tHM, carbon recycling to 100.72 kg/tHM and abate carbon dioxide emissions by 94.00 Nm3/tHM. Theoretically, the minimum total carbon consumption value is 399.73 kg/tHM. These results illustrate the great potential for carbon recycling and coke saving in gas-injection BFs without increasing total carbon consumption.

中文翻译：

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注气高炉的节能和二氧化碳减排潜力

摘要 喷气高炉（BF）是一种以喷气代替传统喷煤（PCI），通过气化炉回收高炉炉顶煤气的新型炼铁工艺。与传统的全焦和 PCI 高炉相比，焦化率主要取决于注气量高的注气高炉的热量消耗，因此具有很大的节焦潜力。从节能、碳循环、CO2减排、燃料成本等方面考虑，直接减排程度应在0.2~0.3之间。此外，根据喷气量和风口区富氧率的影响，得到了最佳喷注参数，可将焦炭率降低至273.36 kg/tHM，碳回收至100.72 kg/tHM并减少二氧化碳排放量为 94.00 Nm3/tHM。理论上，最低总碳消耗值为 399.73 kg/tHM。这些结果说明了在不增加总碳消耗量的情况下，注气高炉中碳循环和节省焦炭的巨大潜力。