Simulation of WO3 reduction in H2
Reduction of WO3 to tungsten in a hydrogen atmosphere is described by well–known reaction schemes, for which temperature and reaction progress is described by the Discrete Particle Method (DPM). Hydrogen as a gaseous phase is introduced as a reducing agent that streams over a packed bed of tungsten oxide particles. The flow over and penetration of hydrogen into the bed of tungsten particles is represented by an advanced two-phase CFD-tool for a porous media.
An outstanding feature of the herein proposed numerical concept is that each powder particle is treated as an individual entity that is described by its thermodynamic state e.g. temperature and reaction progress. The thermodynamic state includes one-dimensional and transient distributions of temperature and species within the particle and therefore allows a detailed and accurate characterization of the reaction progress.
XDEM predictions for tungsten oxide reduction were compared to experimental data showing a high degree of accuracy. Therefore, the approach provides a deeper insight into the process, because particle temperatures and interaction of particles with the fluid are inaccessible in a furnace during experiments.
Keywords: Tungsten oxide reduction, Discrete Element Method (DEM), Computational Fluid Dynamics (CFD)
XDEM employed to predict reduction of tungsten oxide in a dry hydrogen atmosphere
eXtended Discrete Element Method used for predicting tungsten-oxide reduction in a dry-hydrogen atmosphere