二氧化钛和还原气体:氧化铁颗粒直接还原的复杂关系

Pasquale Cavaliere, Behzad Sadeghi, Aleksandra Laska, Damian Koszelow
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引用次数: 0

摘要

为了满足可持续铁生产和减少二氧化碳排放的需要,本研究深入探讨了二氧化钛在氧化铁球团直接还原过程中的复杂作用。我们深入研究了在不同温度和气体成分下,利用 H2 和 CO 气体还原氧化铁球团时 TiO2 的相关还原性。我们的研究结果揭示了二氧化钛效应的细微差别,其浓度依赖行为突出表明了在 1 至 1.5 pct TiO2 之间的最佳范围内,对还原动力学和扩散系数有中性或积极的影响。值得注意的是,CO 和 H2 在 1000 °C 时的协同作用尤其有效,这表明它们对还原过程具有互补作用。在由 CO 调节的还原气氛中引入 H2,不仅扩大了过渡范围,还明显加快了还原速度。此外,我们的研究还强调了二氧化钛效应的温度敏感性,在 900 °C 的 100 pct H2 大气中,二氧化钛含量越高,还原时间越长。在 100 pct H2 大气中,TiO2 的非贡献作用源于水-气转移反应。相反,在有 TiO2 的一氧化碳控制还原气氛中引入 H2,可提高过渡范围并加快还原速度。此外,我们的研究结果还强调了总铁含量的作用,揭示了与还原过程的直接关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

TiO2 and Reducing Gas: Intricate Relationships to Direct Reduction of Iron Oxide Pellets

TiO2 and Reducing Gas: Intricate Relationships to Direct Reduction of Iron Oxide Pellets

In response to the imperative for sustainable iron production with reduced CO2 emissions, this study delves into the intricate role of TiO2 in the direct reduction of iron oxide pellets. The TiO2-dependent reducibility of iron oxide pellets utilizing H2 and CO gas across varied temperatures and gas compositions is thoroughly investigated. Our findings unveil the nuanced nature of the TiO2 effect, underscored by its concentration-dependent behavior, revealing an optimal range between 1 and 1.5 pct TiO2, where a neutral or positive impact on reduction kinetics and diffusion coefficient is observed. Notably, the synergistic interplay of CO and H2 at 1000 °C emerges as particularly efficacious, suggesting complementary effects on the reduction process. The introduction of H2 into the reducing atmosphere regulated by CO not only extends the transition range but also markedly expedites the rate of reduction. Furthermore, our study highlights the temperature sensitivity of the TiO2 effect, with higher TiO2 content correlating with prolonged reduction time in a 100 pct H2 atmosphere at 900 °C. In a 100 pct H2 atmosphere, the non-contributory role of TiO2 stems from the water-gas shift reaction. Conversely, introducing H2 into a CO-controlled reducing atmosphere with TiO2 enhances the transition range and expedites the reduction rate. Additionally, our findings underscore the role of total iron content, revealing a direct correlation with the reduction process.

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