Polytechnic School of Engineering, University of Oviedo, 33204, Gijón, Spain.
Environ Sci Pollut Res Int. 2020 Jan;27(1):33-42. doi: 10.1007/s11356-019-06474-3. Epub 2019 Sep 14.
Recycled steel is a key material for sustainable development. However, not all steel demand can be met by recycling, and therefore, new metallic iron must be introduced in the global cycle. The transformation of iron oxides into steel requires carbon which is oxidized into CO. This paper focuses on the basic oxygen furnace (BOF) where molten iron is converted into liquid steel. In order to assess the effect of molten iron temperature on CO emissions, the process has been modelled using mass and energy balances. Model results show that, for a typical converter charge, a slight increase of 10 °C can lead to a direct reduction of 0.006 t of CO per ton of liquid steel. A total variation of 0.17 t of CO per ton of liquid steel is found depending on plant strategy and process constraints. Finally, different actuation levers for carbon mitigation are assessed. It can be concluded that operation and modelling improvements should be jointly addressed to exploit their full potential for carbon footprint reduction.
再生钢是可持续发展的关键材料。然而，并非所有的钢铁需求都可以通过回收来满足，因此，必须在全球循环中引入新的金属铁。将氧化铁转化为钢需要被氧化成 CO 的碳。本文重点介绍了用于将液态铁转化为液态钢的碱性氧气转炉（BOF）。为了评估铁水温度对 CO 排放的影响，使用质量和能量平衡对该过程进行了建模。模型结果表明，对于典型的转炉装料，铁水温度仅升高 10°C，就能直接减少每吨液态钢 0.006 吨的 CO 排放量。根据工厂策略和工艺限制，每吨液态钢的 CO 总变化量为 0.17 吨。最后，评估了不同的碳减排驱动因素。可以得出结论，应该共同解决操作和建模方面的改进问题，以充分发挥它们在减少碳足迹方面的潜力。
