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Development of a kinetic mechanism for the direct reduction of hematite pellets in CO-H2 atmospheres using a porous solid pellet model

Ali, Mohammed Liaket and Fradet, Quentin and Riedel, Uwe (2021) Development of a kinetic mechanism for the direct reduction of hematite pellets in CO-H2 atmospheres using a porous solid pellet model. In: 9th International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking, STEELSIM 2021, pp. 666-677. STEELSIM 2021, 05-07.10.2021, Vienna, online. ISSN 978-3-200-07994-6.

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Abstract

Increasing interest in the direct reduction of iron has revived investigations on gaseous iron oxides' kinetics. Despite extensive studies on the reduction of iron oxides with pure hydrogen or with syngas, the development of a generic reduction mechanism of iron oxides is still lacking. The conventional shrinking core model hardly distinguishes between transport processes and reaction processes, leading to biases in the kinetic model. In the present study, a porous solid model, which solves mass balances of the individual gas species and solid ones assuming spherical symmetry, is used for developing a heterogeneous kinetic mechanism accounting for different iron oxides (Fe2O3, Fe3O4, FeO). It also accounts for carbon accumulation and cementite (Fe3C) formation to model phenomena like carbon deposition and incomplete reduction of iron oxide using CO/-H2 mixtures. The proposed generic mechanism successfully reproduces 50 sets of experimental data by six different authors from the literature for single iron oxide pellet reduction with syngas of varying hydrogen content up to pure hydrogen without any adjustment of its parameters. The simulated results show a very good agreement with the experimental data. Finally, the effects of gas composition, temperature, and pellet characteristics on the reducing of iron oxide are investigated.

Item URL in elib:https://elib.dlr.de/146312/
Document Type:Conference or Workshop Item (Lecture)
Title:Development of a kinetic mechanism for the direct reduction of hematite pellets in CO-H2 atmospheres using a porous solid pellet model
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.deUNSPECIFIED
Date:5 October 2021
Journal or Publication Title:9th International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking, STEELSIM 2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 666-677
ISSN:978-3-200-07994-6
Status:Published
Keywords:Iron oxide pellet direct reduction, porous solid model, CO/-H2 reduction, carbon deposition, cementite formation
Event Title:STEELSIM 2021
Event Location:Vienna, online
Event Type:international Conference
Event Dates:05-07.10.2021
Organizer:ASMET
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: Cottbus , Zittau
Institutes and Institutions:Institute of Low-Carbon Industrial Processes > Low-Carbon Reducing Agents
Institute of Low-Carbon Industrial Processes > Simulation and Virtual Design
Deposited By: Ali, Mohammed Liaket
Deposited On:16 Dec 2021 16:38
Last Modified:16 Dec 2021 16:38

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