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

doi:10.1016/j.cjche.2015.12.020

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 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 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

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

Xin Li, Helong Hui, Songgeng Li, Lu He, Lijie Cui. Integration of coal pyrolysis process with iron ore reduction: Reduction behaviors of iron ore with benzene-containing coal pyrolysis gas as a reducing agent[J]. Chin.J.Chem.Eng., 2016, 24(6): 811-817.

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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

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

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