A new process of prereduction of rotary kiln‐oxygen coal combustion and melting ironmaking was developed. The core is to realize the conversion of mass and energy of pulverized coal through high‐density injection of pulverized coal and high‐density combustion in the molten pool to provide the required energy for the ironmaking process. By calculating the combined energy values of working conditions under different metallization rates (η), gas oxidation degrees (α) and blast oxygen content (μ), the pulverized coal consumption, exergy income, exergy expenditure, four gas exergy values, and process of the process system under different working conditions were analyzed. Exergy using efficiency, quantitatively evaluated the interaction between the mass‐energy conversion efficiency of coal powder and process parameters and used orthogonal analysis to determine the combination of working conditions with the highest energy utilization rate. The results show that increasing the metallization rate, gas oxidation degree, and blasting oxygen content will change the exergy value, and the exergy utilization efficiency will increase with the increase of metallization rate, gas oxidation degree, and blast oxygen content, but the various parts exergy the value does not reach the optimum with the increase of the process operating parameters. After comparing and analyzing the overall working conditions, it can be known that when the charge metallization rate is 70%, the melting furnace gas oxidation degree is 12% and the blast oxygen content is 98%, the rotary kiln‐oxygen coal combustion melting furnace has the best operating conditions and the highest energy utilization efficiency. A mathematical relationship model including metallization rate, gas oxidation degree, blast oxygen content, and process exergy utilization efficiency was established: y = η × 0.1908+α × 0.467227383+μ × 0.137069+0.522508.

中文翻译：

---

煤粉质能转化效率对氧气炼铁的影响及参数优化

开发了一种预还原回转窑氧气燃烧和炼铁的新工艺。核心是通过高密度注入煤粉并在熔池中进行高密度燃烧来实现煤粉质量和能量的转换，从而为炼铁过程提供所需的能量。通过计算不同金属化速率（η），气体氧化度（α）和高炉含氧量（μ），分析了不同工作条件下的煤粉消耗量，火用收入，火用支出，四种瓦斯利用值以及过程系统的过程。用能利用效率，定量评估煤粉质量能转换效率与工艺参数之间的相互作用，并使用正交分析确定具有最高能源利用率的工作条件的组合。结果表明，金属化速率，气体氧化度和喷砂含氧量的增加会改变能值，并且随着金属化速率，气体氧化度和鼓风含氧量的增加，能效利用效率会提高，但各个部位随着过程操作参数的增加，本值不能达到最佳值。通过对整体工作条件的比较和分析，可以知道，当炉料金属化率为70％时，熔化炉气体的氧化度为12％，高炉氧气含量为98％时，回转窑-氧煤燃烧熔化炉具有最佳的工作条件和最高的能源利用效率。建立了包括金属化速率，气体氧化程度，高炉含氧量和过程火用效率的数学关系模型：ÿ = η ×0.1908+ α ×0.467227383+ μ ×0.137069 + 0.522508。