La réduction dans le haut fourneau et la recherche des très faibles mises au mille de coke

Nicolle, R.; Capelani, R.; Guillot, J.B.; Rist, A.

doi:10.1051/metal/198077100769

Cited by 2 publications

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“…The graphical representation of the blast furnace was particularly relevant from an educational point of view. Moreover, through the evaluation of material and heat balances within the blast furnace, the diagram has been used for years both to describe the operating point of a blast furnace and to establish prospective operating points for optimization [7,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Adaptation of the Rist Operating Diagram as a Graphical Tool for the Direct Reduction Shaft

Quatravaux

Barros

Gardin

et al. 2021

Metals

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The blast-furnace operating diagram proposed by Rist was revised to direct reduction and was specifically applied to the Midrex NGTM process. The use of this graphical tool in the study of an industrial process highlighted the staggered nature of the reduction in the shaft furnace with, in particular, the existence of a prereduction zone in the upper part where metallization is thermodynamically impossible. A sensitivity study also showed the impact of the in situ reforming rate on the ability of the gas to completely reduce iron oxides. Finally, we graphically defined the minimum quality required for the top gas to produce direct-reduced iron.

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Section: Introductionmentioning

confidence: 99%

Adaptation of the Rist Operating Diagram as a Graphical Tool for the Direct Reduction Shaft

Quatravaux

Barros

Gardin

et al. 2021

Metals

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A Graphical Tool to Describe the Operating Point of Direct Reduction Shaft Processes

Quatravaux

2023

Metals

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This article presents a new graphical tool for direct reduction shaft processes inspired by the Rist diagram developed for blast furnaces. The tool represents gas flows using vectors, with specific consumption and specific oxidation as components to indicate gas/iron ratios. Key features include consideration of gas chemical composition for vector directions, easy visual representation of gas mixtures, as well as reduction and carburization rates of direct reduced iron (DRI). The tool also includes thermodynamic conditions for reduction from the Chaudron diagram, analogous to the Rist diagram. Several practical applications are presented, including quantifying gas moisture, evaluating the measurement consistency of flowmeters and gas analyzers in top gas recycling, and evaluating instantaneous DRI production by analyzing reducing gas at the inlet and outlet of the shaft. This graphical tool could be useful for production teams to monitor and optimize process flows and promote understanding among students, engineers, technicians, and operators. Its potential for online use further enhances its practical value. As a result, the tool is of significant academic and industrial interest in improving process efficiency and optimization.

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La réduction dans le haut fourneau et la recherche des très faibles mises au mille de coke

Cited by 2 publications

References 0 publications

Adaptation of the Rist Operating Diagram as a Graphical Tool for the Direct Reduction Shaft

Adaptation of the Rist Operating Diagram as a Graphical Tool for the Direct Reduction Shaft

A Graphical Tool to Describe the Operating Point of Direct Reduction Shaft Processes

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