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

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 com- pound. Variables such as reduction temperature, reduction time and b...

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Bibliographic Details
Published inChinese journal of chemical engineering Vol. 24; no. 6; pp. 811 - 817
Main Authors Li, Xin, Hui, Helong, Li, Songgeng, He, Lu, Cui, Lijie
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2016
Subjects
Coal pyrolysis
Integration
Iron reduction
Tar effect
一体化
固定床反应器
热解气体
煤热解过程
苯
还原剂
还原行为
铁矿石还原
Integration
Iron reduction
Tar effect
Coal pyrolysis
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Summary: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 com- pound. Variables such as reduction temperature, reduction time and benzene concentration are studied. The car- bon deposition of benzene results in the retarded iron reduction at low temperatures. At high temperatures over 800 ~C, the presence of benzene in the gas can promote iron reduction. The metallization can reach up to 99% in 20 min at 900 ~C 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.
Bibliography:11-3270/TQ
Coal pyrolysisIron reductionIntegrationTar effect
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 com- pound. Variables such as reduction temperature, reduction time and benzene concentration are studied. The car- bon deposition of benzene results in the retarded iron reduction at low temperatures. At high temperatures over 800 ~C, the presence of benzene in the gas can promote iron reduction. The metallization can reach up to 99% in 20 min at 900 ~C 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.
ISSN:1004-9541
2210-321X
DOI:10.1016/j.cjche.2015.12.020