Kinetic model development for iron particle thermo-chemical reduction/oxidation and investigations of dust firing in CFD simulations

One major focus of the DLR Institute of Low-Carbon Industrial Processes is the direct reduction of iron ores to mitigate CO2 emissions related to the steel industry. The know-how gained in this field will serve to address the specificity of the thermo-chemical processes considered in Clean Circles. In particular, an existing framework which has been successfully tested for reproducing wide sets of literature data of gaseous iron oxide pellet reduction will be employed. Also, a so-called sectional approach, previously validated for the gasification of biomass microparticles, can be transposed for the oxidation of iron microparticles.

The main goals of this project are proposing kinetic models for the thermo-chemical oxidation/reduction of iron particle, and iron dust firing investigations in a CFD environment. First, the kinetics of the reduction of hematite to iron will be investigated. Then, the kinetic of the reverse (oxidation) step will be studied, bringing further considerations, such as the type of oxidation, or the heat release. Finally, the kinetic models will be transposed in a CFD environment for the simulation of iron flames, from a laminar case (Bunsen burner) to a turbulent one (high-pressure jet). Ultimately, this sub-project lays the basis for the accurate assessment of the dust firing efficiency.

Scientific questions:

  • How does the overall reduction/oxidation of a single particle evolve with time for a variety of gas conditions (temperature, pressure, composition, …) and solid ones (size, porosity, composition, …)?
  • How does the macroscopic flame structure evolve with varying gas to fuel ratio, particle size or temperature?
  • What are the effects of turbulence on iron dust oxidation?
  • What efficiency can be expected in an industrial reactor of iron thermo-chemical oxidation?

Team

Picture: DLR

German Aerospace Center (DLR)

Contact

work +49 355 3556450 1

Work Walther-Pauer-Straße 5
03046 Cottbus

Deutsches Zentrum für Luft- und Raumfahrt e.V.
Institut für CO2-arme Industrieprozesse

Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)

Contact

work +49 355 53556 4514

Work Walther Pauer Straße 5
03046 Cottbus

Deutsches Zentrum für Luftund Raumfahrt e. V. (DLR)
Institut für CO2-arme Industrieprozesse
Abteilung Simulation und virtuelles Design (SVD)

Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)

Associated member

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work +49 358 35854536

Work 9 R 121
Äußere Oybiner Straße 14/16
02763 Zittau

Deutsches Zentrum für Luft und Raumfahrt e. V. (DLR)
Institut für CO2-arme Industrieprozesse

Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)

Associated member

Contact

work +49 358 3585 4537

Work 9 R 104
Äußere Oybiner Straße 14/16
02763 Zittau

Deutsches Zentrum für Luft und Raumfahrt e. V. (DLR)
Institut für CO2-arme Industrieprozesse

Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)

Associated member

Contact

work +49 30 670558077

Work Schwenninger Weg 1
02763 Zittau

Deutsches Zentrum für Luftund Raumfahrt e. V. (DLR)

Institute of Low-Carbon Industrial Processes

Deutsches Zentrum für Luft- und Raumfahrt (DLR)

Associated member

Contact

work +49 3583 585 4532

Work Schwenninger Weg 1
02763 Zittau

Deutsches Zentrum für Luftund Raumfahrt e. V. (DLR)

Institute of Low-Carbon Industrial Processes