A5002293047- Combustion and flame dynamics
- Advanced Combustion Engine Technologies
- Combustion and Detonation Processes
- Fire dynamics and safety research
- Thermochemical Biomass Conversion Processes
- Particle Dynamics in Fluid Flows
- Radiative Heat Transfer Studies
- Thermal and Kinetic Analysis
- Graphite, nuclear technology, radiation studies
- Computational Fluid Dynamics and Aerodynamics
- nanoparticles nucleation surface interactions
- Iron and Steelmaking Processes
- Catalytic Processes in Materials Science
- Atmospheric chemistry and aerosols
- Coagulation and Flocculation Studies
- Extraction and Separation Processes
- Heat transfer and supercritical fluids
- Energetic Materials and Combustion
- Flame retardant materials and properties
- Iron oxide chemistry and applications
- Chemical Looping and Thermochemical Processes
- Hybrid Renewable Energy Systems
- Coal Combustion and Slurry Processing
- Environmental and Industrial Safety
- Engine and Fuel Emissions
Technical University of Darmstadt
2018-2025
TU Bergakademie Freiberg
2014-2016
The effective usage of renewable energy sources requires ways storage and delivery to balance demand availability divergences. Carbon-free chemical carriers are proposed solutions, converting clean electricity into stable media for storage, long-distance trade on-demand generation. Among them, hydrogen (H2) is noteworthy, being the subject significant investment research. Metal fuels, such as iron (Fe), represent another promising solution a supply, but establishing an interconnected...
Abstract Three-dimensional carrier-phase direct numerical simulations (CP-DNS) of reacting iron particle dust clouds in a turbulent mixing layer are conducted. The simulation approach considers the Eulerian transport equations for gas phase and resolves all scales turbulence, whereas boundary layers modelled employing Lagrangian point-particle framework dispersed phase. CP-DNS employs an existing sub-model combustion that oxidation to FeO accounts both diffusion- kinetically-limited...
As the urgency for decarbonization of economies around world is becoming more pressing, green energy carriers synthesized with renewable are emerging as tradable commodities connecting regions abundant to those high demand. Among various options, metals – especially iron have been identified by scientific community promising fuels due their volumetric densities. However, there persists a gap in comprehensive thermodynamic analyses despite growing interest. This study provides rigorous...
Iron and its oxides have been proposed as energy carriers for a carbon-free, circular economy. Focusing on the release step of cycle, this work is concerned with combustion iron particles in air. In context, accurate prediction oxidation time scales individual microparticles represent fundamental building block high-fidelity models dust flames. While lot progress has made modeling particle burnout up to stoichiometry FeO, further Fe3O4 'reactive cooling' phase still requires research. During...
One strategy for utilizing ammonia as an energy vector is to replace conventional hydrocarbons with hydrogen-enriched in existing or retrofitted combustors. However, the strong differential diffusion effect of hydrogen can significantly alter combustion properties and cause challenges combustor operability. Therefore, this numerical study performs a systematic investigation on fundamental ammonia/hydrogen fuel blends. The investigated span from initiation combustion, i.e., ignition,...
Iron is a very promising candidate for the use as chemical energy carrier. For application it crucial to understand reaction behavior of iron and oxide powders in micrometer range. Recent evidence shows that oxidation differs from well understood slab oxidation. As reactions are fast, approaches using quantitative in-situ analytical methods desired. Herein, we follow powder reduction Fe-57 Mössbauer spectroscopy X-ray diffraction. A time resolution 30 min achieved with even natural isotopic...
This article presents numerical simulations of an iron dust Bunsen flame. The results are validated against experimental results. burning velocity is extracted from the 3D simulation results, as in experiments. agreement between model and experiment best to date for flames. A comparison performed 1D improve our understanding how flame deviates ideal reveals that co-flow mixes with post-flame zone, increasing oxygen concentration reaction layer, which increases velocity. Moreover, analysis...
Iron is an abundant and non-toxic element that holds great potential as energy carrier for large-scale long-term storage. While from a general viewpoint iron oxidation well-known, the detailed kinetics of micrometer sized particles are missing, but required to enable utilization production. In this work, subjected temperature-programmed oxidation. By dilution with boron nitride sintering prevented enabling follow single particle effects. The mass fractions its oxides determined different...
Iron combustion is emerging as a topic of immediate interest, given the need for decarbonization heat and power generation. Opposite to other solid fuels, iron particles burn predominantly in non-volatile, heterogeneous mode. For dust flames, two modes flame propagation have been observed i.e. discrete mode, when transfer time scale larger than particle burn-time, continuous timescale smaller burn-time single particle. The speed such primarily depends on mass which characterized by distance...
The ignition temperature is closely linked to the reaction front speed in iron dust flames, a crucial target quantity when trying predict characteristics of such flames. To this end, microparticles analyzed paper by means single particle simulations which are compared with recent experiments Ning et al. Different sizes and oxygen concentrations gas phase investigated, since particles flame polydisperse experience vastly different atmospheres. Several modeling approaches have been proposed...