Reduction behavior of packed bed of sinter reduced by CO-CO2-H2-H2O-N2 gas

Tatsuya Kon; Ryo Saito; Shigeru Ueda; Shungo Natsui; Ryo Inoue; Tatsuro Ariyama

doi:10.2355/isijinternational.55.1213

Reduction behavior of packed bed of sinter reduced by CO-CO₂-H₂-H₂O-N₂ gas

Tatsuya Kon, Ryo Saito, Shigeru Ueda, Shungo Natsui, Ryo Inoue, Tatsuro Ariyama

Division of Process and System Engineering

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

To mitigate CO₂ emission from a blast furnace, the use of H₂ as a reducing agent is considered to be a prominent method. Reduction of iron ore was reported to be improved by H₂ addition. In the present research, reduction in a sinter-packed bed by CO and H₂ was carried out under various oxygen partial pressures, and the influence of reduction atmosphere on the reaction behavior was investigated. It was confirmed that the reduction rates were higher when using H₂/H₂O and CO/CO₂/H₂/H₂O mixtures than when using a CO/CO₂ gas mixture. The reaction rate constant for iron ore reduction was determined from the experimental result using a numerical model. The influence of the water-gas shift reaction on the reduction rate was analyzed by comparing the results obtained using the numerical model and those in the experiments. Moreover, the longitudinal distribution of the reaction rate in the packed bed was analyzed to examine the influence of the water-gas shift reaction.

Original language	English
Pages (from-to)	1213-1222
Number of pages	10
Journal	Isij International
Volume	55
Issue number	6
DOIs	https://doi.org/10.2355/isijinternational.55.1213
Publication status	Published - 2015

Keywords

Blast furnace
Hydrogen
Reduction
Sinter ore

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.2355/isijinternational.55.1213

Cite this

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title = "Reduction behavior of packed bed of sinter reduced by CO-CO2-H2-H2O-N2 gas",

abstract = "To mitigate CO2 emission from a blast furnace, the use of H2 as a reducing agent is considered to be a prominent method. Reduction of iron ore was reported to be improved by H2 addition. In the present research, reduction in a sinter-packed bed by CO and H2 was carried out under various oxygen partial pressures, and the influence of reduction atmosphere on the reaction behavior was investigated. It was confirmed that the reduction rates were higher when using H2/H2O and CO/CO2/H2/H2O mixtures than when using a CO/CO2 gas mixture. The reaction rate constant for iron ore reduction was determined from the experimental result using a numerical model. The influence of the water-gas shift reaction on the reduction rate was analyzed by comparing the results obtained using the numerical model and those in the experiments. Moreover, the longitudinal distribution of the reaction rate in the packed bed was analyzed to examine the influence of the water-gas shift reaction.",

keywords = "Blast furnace, Hydrogen, Reduction, Sinter ore",

author = "Tatsuya Kon and Ryo Saito and Shigeru Ueda and Shungo Natsui and Ryo Inoue and Tatsuro Ariyama",

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T1 - Reduction behavior of packed bed of sinter reduced by CO-CO2-H2-H2O-N2 gas

AU - Kon, Tatsuya

AU - Saito, Ryo

AU - Ueda, Shigeru

AU - Natsui, Shungo

AU - Inoue, Ryo

AU - Ariyama, Tatsuro

PY - 2015

Y1 - 2015

N2 - To mitigate CO2 emission from a blast furnace, the use of H2 as a reducing agent is considered to be a prominent method. Reduction of iron ore was reported to be improved by H2 addition. In the present research, reduction in a sinter-packed bed by CO and H2 was carried out under various oxygen partial pressures, and the influence of reduction atmosphere on the reaction behavior was investigated. It was confirmed that the reduction rates were higher when using H2/H2O and CO/CO2/H2/H2O mixtures than when using a CO/CO2 gas mixture. The reaction rate constant for iron ore reduction was determined from the experimental result using a numerical model. The influence of the water-gas shift reaction on the reduction rate was analyzed by comparing the results obtained using the numerical model and those in the experiments. Moreover, the longitudinal distribution of the reaction rate in the packed bed was analyzed to examine the influence of the water-gas shift reaction.

AB - To mitigate CO2 emission from a blast furnace, the use of H2 as a reducing agent is considered to be a prominent method. Reduction of iron ore was reported to be improved by H2 addition. In the present research, reduction in a sinter-packed bed by CO and H2 was carried out under various oxygen partial pressures, and the influence of reduction atmosphere on the reaction behavior was investigated. It was confirmed that the reduction rates were higher when using H2/H2O and CO/CO2/H2/H2O mixtures than when using a CO/CO2 gas mixture. The reaction rate constant for iron ore reduction was determined from the experimental result using a numerical model. The influence of the water-gas shift reaction on the reduction rate was analyzed by comparing the results obtained using the numerical model and those in the experiments. Moreover, the longitudinal distribution of the reaction rate in the packed bed was analyzed to examine the influence of the water-gas shift reaction.

KW - Blast furnace

KW - Hydrogen

KW - Reduction

KW - Sinter ore

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