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Kinetic mechanism development for the direct reduction of single hematite pellets in H2 /CO atmospheres

Ali, Mohammed Liaket and Fradet, Quentin and Riedel, Uwe (2022) Kinetic mechanism development for the direct reduction of single hematite pellets in H2 /CO atmospheres. steel research international, p. 2200043. Wiley. doi: 10.1002/srin.202200043. ISSN 1611-3683.

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Official URL: https://dx.doi.org/10.1002/srin.202200043

Abstract

Increasing interest in the direct reduction process of iron ore has revived investigations on gaseous and heterogeneous iron oxides’ kinetics. Despite extensive studies on the reduction of iron oxides with pure hydrogen or syngas, the development of a generic reduction mechanism for iron oxides is still lacking. The conventional shrinking core model hardly distinguishes between transport and reaction processes, leading to biases or even errors in the kinetic models. In the present study, a porous solid model, which solves mass balances of the individual gas-phase species and solid ones assuming spherical symmetry, is used for developing a heterogeneous kinetic mechanism accounting for different iron oxidation stages (Fe2O3, Fe3O4, FeO). It also accounts for carbon accumulation and cementite formation to model the carburization phenomena when using carbon-containing reducing agents like syngas. The proposed generic mechanism successfully reproduces 49 experimental data sets from the literature for single iron oxide pellets’ isothermal reduction with syngas of varying hydrogen content up to pure hydrogen without any adjustment of its parameters. The model predictions are in excellent agreement with the experimental data. Finally, the carburization kinetics are explained, and the factors (e.g., temperature, hydrogen content) affecting the carbon deposition are analyzed.

Item URL in elib:https://elib.dlr.de/189273/
Document Type:Article
Title:Kinetic mechanism development for the direct reduction of single hematite pellets in H2 /CO atmospheres
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ali, Mohammed LiaketMohammed.Ali (at) dlr.dehttps://orcid.org/0000-0002-9314-0402
Fradet, QuentinQuentin.Fradet (at) dlr.dehttps://orcid.org/0000-0003-4968-8494
Riedel, UweUwe.Riedel (at) dlr.dehttps://orcid.org/0000-0001-8682-2192
Date:2022
Journal or Publication Title:steel research international
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1002/srin.202200043
Page Range:p. 2200043
Publisher:Wiley
ISSN:1611-3683
Status:Published
Keywords:carburization, direct reduction processes, H2/CO reduction, iron oxide pellets, porous solid model
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Low-Carbon Industrial Processes
Location: Zittau
Institutes and Institutions:Institute of Low-Carbon Industrial Processes
Deposited By: Ali, Mohammed Liaket
Deposited On:24 Nov 2022 10:36
Last Modified:24 Nov 2022 10:36

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