Plus d'info sur IFP Energies nouvelles - Sciences et Technologies du Numérique
Stage Chimie Hauts-de-Seine entre aujourd'hui et avril 2023 de 5 à 6 mois
IFP Energies nouvelles (IFPEN) est un acteur majeur de la recherche et de la formation dans les domaines de l’énergie, du transport et de l’environnement. De la recherche à l’industrie, l’innovation technologique est au cœur de son action, articulée autour de quatre priorités stratégiques : Mobilité Durable, Energies Nouvelles, Climat / Environnement / Economie circulaire et Hydrocarbures Responsables.
Dans le cadre de la mission d’intérêt général confiée par les pouvoirs publics, IFPEN concentre ses efforts sur :
Partie intégrante d’IFPEN, l’école d’ingénieurs IFP School prépare les générations futures à relever ces défis.
Hydrogen fuel is currently identified as a promising solution to decarbonize industrial and domestic burners that nowadays operates with natural gas (mainly CH4). Before switching to fully hydrogen burners, an intermediate step would consist in adding in different portions (between 20% and 30%) of H2 in the fuel mix together with CH4. However, one of the main drawbacks on H2 introduction in the fuel blend is the modification of the main flame properties (speed and temperature, molecular diffusion, flame strain sensitivity, quenching distance, NOx emissions etc.) and the increase of heat transfer by radiation due to water vapor concentration.
Consequently, the flame shape and fluid/wall heat transfers are highly affected. This leads to the necessity of reconsidering a retrofitting and optimization of the burners. For this sake, CFD is a recognized key-tool that can help the retrofitting process giving access to a high-fidelity 3D representation of the investigated technological configurations. The simulation fidelity can be further improved if heat transfer toward the wall (convective and radiative) as well as solid conduction are accounted in the simulation.
In line with the knowhow on combustion and CHT modelling, IFPEN is building-up several project proposals on the introduction of alternative e-fuels in industrial burners.
This internship proposal aims at pursuing the work initiated in the context of the collaboration with CORIA and CETIAT during the internship of Justin Bertsch. 3D Large-Eddy Simulations (LES) of the CORIA stationary burner fluid domain, fed either by pure CH4 and by CH4-H2 fuel blends were successfully conducted, using the solver CONVERGETM and TFM-AMR combustion model.
Despite the promising results obtained in the fluid simulations (cold flow validation and flame stabilization effect due to H2 addition) some open questions need to be still addressed to complete the study:
In particular, for the CORIA burner configuration, it was observed that thermo-acoustics instabilities are triggered by the modification of the wall thermal field in LES. In the first simulations the thermal wall boundary conditions were estimated from literature.
The scope of the present internship is to develop, starting from the already existing set-up, a fully coupled CHT calculation of the CORIA burner. In the first phase only the solid wall conduction will be simulated while in a second phase the radiative transfer toward the burner wall will be also added. The impact of a weak or a strong coupling will be also evaluated.
The new simulations, conducted in the internship, will be supported by a parallel experimental campaign on the CORIA burner that is ongoing. The present internship will assess the capability of the IFPEN multi-physics tool CONVERGETM to model industrial burner applications.
The ongoing development for accounting H2 differential diffusion in the TFM model could be also integrated in the modelling framework in the final part of the internship
Master M2 (Equivalent Bac +5)
IFP Energies nouvelles - Sciences et Technologies du Numérique