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MIcro to macro-scale MOdeling for SAfe Hydrogen combustion in fluidized beds – MIMOSAH

MIcro to macro-scale MOdeling for SAfe Hydrogen combustion in fluidized beds

Provide a very fine characterization of hydrogen combustion in the presence of particles at microscopic scale. Develop a reliable macro-scale modeling, specifically accounting for all the features inherent to the reactive gas and its interactions with the particulate phase.

Main goals

MIMOSAH aims to develop a fluidized bed process in which hydrogen combustion takes place at sufficiently low temperatures in the presence of a partially inert solid medium, in order to face the risks related to the reactivity and wide range of flammability which characterize this fuel. Indeed, the use of hydrogen presents increased risks compared to conventional fuels. The presence of a dispersed solid phase allows to control the combustion by thermal and/or chemical quenching; a fluidization regime promotes mixing and thermal exchanges. Fluidized bed combustion is therefore a promising solution for a safe production of thermal energy from hydrogen.

A very detailed characterization of the reactive flow is performed by direct numerical simulations of fully resolved particles with the code RESPECT. Data obtained at the microscopic scale are used to develop closures for the N-Euler approach to implement in the code NEPTUNE_CFD. The results obtained from the numerical simulations are compared with the experiments to assess the physical-mathematical modeling.

Mathematical modeling of reactive multi-species two-phase flow in the frame of the 1-fluid approach using the penalty method.

Direct numerical simulation of hydrogen combustion in dense particle regime. Characterization of hydrogen combustion in fluidized beds by experiments. Unsteady 3D simulations of the reactor at laboratory scale.

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This project aims at characterizing the hydrogen combustion in fluidized beds, for the production of thermal energy using mean thermal power devices. A multi-scale approach, from micro to macro scale, will be used. A very fine characterization of the reactive flow will be carried out by the fully-resolved particle direct numerical simulation (FRP-DNS). The latter will be first conducted in a fixed-bed configuration in order to validate the reduced reaction schemes, developed within the project, against fixed-bed experimental measurements. Next, FRP-DNS will be performed in a fluidized regime, to study the hydrogen combustion in fluidized beds, at microscopic scale. From micro-scale numerical results, closures laws to use in a macro-scale approach will be developed. The new models will be implemented in a N-Euler code and numerical simulations of fluidized beds performed and compared with fluidized-bed experiments.

Project coordination

Enrica MASI (Institut de Mécanique des Fluides de Toulouse)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

IMFT Institut de Mécanique des Fluides de Toulouse

Help of the ANR 280,044 euros
Beginning and duration of the scientific project: February 2020 - 48 Months

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