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首页> 外文期刊>ISIJ international >Coal-char/Slag Interactions during Pulverised Coal Injection in a Blast Furnace: Reaction Kinetics and Wetting Investigations
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Coal-char/Slag Interactions during Pulverised Coal Injection in a Blast Furnace: Reaction Kinetics and Wetting Investigations

机译：高炉粉煤喷射过程中的煤焦/炉渣相互作用：反应动力学和润湿研究

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The kinetics of reactions taking place in the slag/carbon interfacial region was investigated at 1 500℃ for a range of carbonaceous materials, namely synthetic graphite, natural graphite and two coal-chars. Two blast furnace slags, one rich in iron oxide and other rich in silica were used in this study. Slag/carbon reactions were studied in a horizontal tube resistance furnace in argon atmosphere, using the sessile drop approach. The volumes of CO and CO_2 evolved were obtained from an analysis of off-gases with the help of a mass spectrometer. These reactivity studies were supplemented with wettability measurements on these systems. With iron oxide rich slag 1, all carbonaceous materials showed non-wetting behaviour without much improvement with time. With silica rich slag 2, natural graphite and coal-chars showed dynamic wetting after some time. Synthetic graphite however continues to remain non-wetting. Reduction of iron oxide was a predominant reaction with slag 1 and reached completion for all carbon substrates. Reduction of silica, main reaction with slag 2, was however partial with considerable amounts of unreduced silica remaining behind even after 1 800s of contact. Overall reaction rates in the initial stages of contact were quite similar for both graphites whereas both coal-chars showed relatively high reaction rates. These results point towards the important roles played by the chemical composition of slags and carbonaceous materials in reduction reactions.
机译：对于一系列含碳物质，即合成石墨，天然石墨和两种煤焦，研究了在炉渣/碳界面区域在1500℃下发生反应的动力学。本研究中使用了两种高炉矿渣，一种是高铁氧化物，另一种是高二氧化硅。使用无滴法在氩气气氛下的卧式电阻炉中研究了炉渣/碳反应。在质谱仪的帮助下，通过分析废气获得了释放出的CO和CO_2的体积。这些反应性研究在这些系统上补充了润湿性测量。使用富含氧化铁的炉渣1，所有含碳物质均表现出非润湿行为，但不会随时间而有很大改善。使用富含二氧化硅的炉渣2，天然石墨和煤焦在一段时间后显示出动态润湿。然而，合成石墨继续保持不润湿。氧化铁的还原是与炉渣1的主要反应，并且所有碳底物均已还原。然而，二氧化硅的还原是与炉渣2的主要反应，尽管如此，它还是部分还原，即使经过1 800 s的接触，仍有大量未还原的二氧化硅残留在后面。两种石墨在接触初期的总反应速率非常相似，而两种煤焦均显示出较高的反应速率。这些结果表明炉渣和碳质材料的化学组成在还原反应中起着重要作用。

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