SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (6): 811-817.DOI: 10.1016/j.cjche.2015.12.020

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Integration of coal pyrolysis process with iron ore reduction: Reduction behaviors of iron ore with benzene-containing coal pyrolysis gas as a reducing agent

Xin Li1, Helong Hui1, Songgeng Li1, Lu He1, Lijie Cui2   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-06-30 Revised:2015-10-05 Online:2016-07-12 Published:2016-06-28
  • Contact: Songgeng Li, Lijie Cui
  • Supported by:

    Supported by the joint programof theNational Natural Science of Foundation of China and the Shenhua Group Cooperation Limited (51174284).

Integration of coal pyrolysis process with iron ore reduction: Reduction behaviors of iron ore with benzene-containing coal pyrolysis gas as a reducing agent

Xin Li1, Helong Hui1, Songgeng Li1, Lu He1, Lijie Cui2   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • 通讯作者: Songgeng Li, Lijie Cui
  • 基金资助:

    Supported by the joint programof theNational Natural Science of Foundation of China and the Shenhua Group Cooperation Limited (51174284).

Abstract: An integrated coal pyrolysis process with iron ore reduction is proposed in this article. As the first step, iron oxide reduction is studied in a fixed bed reactor using simulated coal pyrolysis gas with benzene as a model tar compound. Variables such as reduction temperature, reduction time and benzene concentration are studied. The carbon deposition of benzene results in the retarded iron reduction at low temperatures. At high temperatures over 800℃, the presence of benzene in the gas can promote iron reduction. The metallization can reach up to 99% in 20 min at 900℃ in the presence of benzene. Significant increases of hydrogen and CO/CO2 ratio are observed in the gas. It is indicated that iron reduction is accompanied by the reforming and decomposition of benzene. The degree of metallization and reduction increases with the increasing benzene concentration. Iron oxide can nearly completely be converted into cementite with benzene present in the gas under the experimental conditions. No sintering is found in the reduced sample with benzene in the gas.

Key words: Coal pyrolysis, Iron reduction, Integration, Tar effect

摘要: An integrated coal pyrolysis process with iron ore reduction is proposed in this article. As the first step, iron oxide reduction is studied in a fixed bed reactor using simulated coal pyrolysis gas with benzene as a model tar compound. Variables such as reduction temperature, reduction time and benzene concentration are studied. The carbon deposition of benzene results in the retarded iron reduction at low temperatures. At high temperatures over 800℃, the presence of benzene in the gas can promote iron reduction. The metallization can reach up to 99% in 20 min at 900℃ in the presence of benzene. Significant increases of hydrogen and CO/CO2 ratio are observed in the gas. It is indicated that iron reduction is accompanied by the reforming and decomposition of benzene. The degree of metallization and reduction increases with the increasing benzene concentration. Iron oxide can nearly completely be converted into cementite with benzene present in the gas under the experimental conditions. No sintering is found in the reduced sample with benzene in the gas.

关键词: Coal pyrolysis, Iron reduction, Integration, Tar effect