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Effect of Hydrogen Addition on Reduction Kinetics of Iron Oxides in Gas-injection BF

机译：加氢对注气高炉中铁氧化物还原动力学的影响

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摘要

The gas-injection BF is a new iron-making technology with injecting gas instead of the traditional pulverized coal injection and recycling the BF top gas through the gasifier. Compare with traditional BF, there is a larger amount of reducing gas such as CO and H2 in gas-injection BF. Effect of H_2 addition on reduction kinetics of iron oxides in gas-injection BF was investigated by Thermogravimetric Analysis. The result shows that the reduction rate of iron oxides rise with the increase in both temperature and H_2 content. By contrast with the H_2 content increasing from 10% to 15% at 700℃ and 900℃, the improvement of reduction rate is more obvious when addition from 15% to 20% at the same temperature. For comparison, it shows an opposite result in the condition of 1 000℃. In addition, the efficiency of H_2 on reduction rate can be neglected as the content is less than 5%. The reaction mechanism was obtained according to the unreacted core model. In the condition of 30% CO+10% H_2, both the diffusion rate and interfacial reaction rate reveal an increasing trend with the increase of temperature, of which the degree of improvement in diffusion rate is more significant, which leads to the interface reaction gradually being the controlling step. The same case occurs with the increase of H_2 at 900℃. Under the condition of experiment, the activation energy decreases with H_2 addition, which illustrates that the reduction of iron oxides become more easily to perform with the rich hydrogen in gas-injection BF.
机译：注气高炉是一种新的炼铁技术，它采用注气代替传统的粉煤注入，并通过气化炉对高炉煤气进行再循环。与传统高炉相比，注气高炉中存在大量的还原气体，如CO，H2。用热重分析法研究了H_2的添加对注气高炉中铁氧化物还原动力学的影响。结果表明，氧化铁的还原率随温度和H_2含量的增加而增加。与之相比，在700℃和900℃下，H_2的含量从10％增加到15％，当在相同温度下从15％增加到20％时，还原率的提高更为明显。为了比较，在1000℃的条件下显示相反的结果。另外，含量小于5％时，可以忽略H 2对还原率的效率。根据未反应的核模型获得了反应机理。在30％CO + 10％H_2的条件下，扩散速率和界面反应速率均随温度的升高而增加，其中扩散速率的改善程度更为显着，导致界面反应逐渐发生。是控制步骤。 900℃时H_2的增加也会引起同样的情况。在实验条件下，活化能随加入H_2的增加而降低，说明注入气体BF中的富氢使铁氧化物的还原变得更容易。

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  • 来源
    《ISIJ international》 |2017年第3期|404-412|共9页
  • 作者

    Yana QIE; Qing LYU; Jianpeng LI; Chenchen LAN; Xiaojie LIU;

  • 作者单位

    College of Metallurgy & Energy, North China University of Science and Technology, Tangshan, 063009 China;

    College of Metallurgy & Energy, North China University of Science and Technology, Tangshan, 063009 China;

    College of Metallurgy & Energy, North China University of Science and Technology, Tangshan, 063009 China;

    School of Metallurgy, Northeastern University, Shenyang, 11081 China;

    College of Metallurgy & Energy, North China University of Science and Technology, Tangshan, 063009 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    reduction kinetics; hydrogen content; unreaction core model; reduction rate;

    机译：还原动力学氢含量未反应核模型还原速率;

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