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Journal Articles Metals Year : 2021

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

Thibault Quatravaux
Jose Barros
  • Function : Author
Pascal Gardin
  • Function : Author
Gabriel Lucena
  • Function : Author

Abstract

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.

Dates and versions

hal-04156804 , version 1 (09-07-2023)

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Thibault Quatravaux, Jose Barros, Pascal Gardin, Gabriel Lucena. Adaptation of the Rist Operating Diagram as a Graphical Tool for the Direct Reduction Shaft. Metals, 2021, 11 (12), pp.1953. ⟨10.3390/met11121953⟩. ⟨hal-04156804⟩
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