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Corona plasma reactor modelling and experimental validation for flue gas pollution control – REMOVAL

Plasma Removal

Corona plasma reactor modelling and experimental validation for flue gas pollution control

3D simulation of corona plasma reactors validated by experimental investigations

The principal aims of the «Plasma ReMoVal« project are the development and the experimental validation of a 3Dxyz software dealing with the simulation of non-equilibrium non-thermal corona plasma reactors operating at atmospheric pressure (PA). Such reactors can be used for the treatment of flue gases. The software will facilitate the design of corona reactors in view of the enhancement of their efficiency at a better cost and will provide essential information for the plasma/catalyses coupling insofar as the gas mixture in contact with the catalytic sites can be identified and where the production of adapted species for the heterogeneous reactions could be maximized.

The project gathers 3 partners: The LAPLACE, the GREMI and SUPELEC

The work program is divided into five main tasks.

Task n°1: 3Dxyz simulation of the micro-discharge including the branching structure and coupling the chemical and hydrodynamics phénomena.

Task n°2: 3Dxyz simulation (using the commercial FLUENT software) of the non stationary reactive gas flow activated by corona discharge.

Task n°3: Development of two specific corona discharge reactors used for the validation of the 3D models of the discharge and post-discharge phases.

Task n°4: Development of a wire-cylinder corona discharge reactor working under conditions close to industrial ones. Test of the capacity of prediction of the developed software.

Try n°5: Compilation and determination of the basic data and purpose of chemical reduction.

under development

under development

under development

The principal aims of the "Plasma ReMoVal" project are the development and the experimental validation of a 3Dxyz software dealing with the simulation of non-equilibrium non-thermal corona plasma reactors operating at atmospheric pressure (PA). Such reactors can be used for the treatment of flue gases. The software will facilitate the design of corona reactors in view of the enhancement of their efficiency at a better cost and will provide essential information for the plasma/catalyses coupling insofar as the gas mixture in contact with the catalytic sites can be identified and where the production of adapted species for the heterogeneous reactions could be maximized. The discharge phase including branching phenomena will be modelized in 3Dxyz geometry for a time duration of about a hundred of nanoseconds thanks to the use of massive parallel computation. The discharge phase simulation involves the electro-hydrodynamic model coupled to chemical and gas dynamics ones. The influence of the transfer of the momentum quantities of charged-neutral species as well as the relaxation of vibrational states into thermal energy is taken into account. The cartography of source terms of both density of radicals and gas temperature, issuing from discharge-phase models is used as the input local data of commercial software (FLUENT) dealing with reactive gas flow stressed by corona discharges. The elaboration and the validation of the software will be performed with test-reactors (point to plane and multi points to plane) filled with humid synthetic ambient air (N2, O2, H2O) operating at saturated vapor pressure. These test-reactors will be electrically supplied by a pulsed voltage in order to facilitate triggering of the fast electronic devices, themselves driving the optical diagnostic apparatus, with the "onset" of the corona microdischarges. The predicative potentiality of the software is studied with new specific reactors specially developed for this project. These reactors operate at very close conditions usually encountered in industrial applications. The gas composition and temperature, the corona reactor geometry (point to plane and wire-cylinder), the choice of the pollutant (C3H6 with or without NO), the gas flow rate and the pulse voltage frequency are some of parameters that will be studied. A particular attention will be paid to the implementation and the use of a diagnostic tool, namely the absorption of wide band radiation issuing from a Z-pinch, which allows absolute measurement of reactive species in both the discharge and the post-discharge phases. Finally, "calculation" and experimental means are developed in order to determine the lack of "basic data" needed for modeling. These data mainly concern the transport coefficient and reaction rate constants of electrons and polyatomic ions (Cluster) in humid mixtures as well as the kinetic scheme of majority molecules, such as N2 (for example) in their vibrational or metastable exitation states.

Project coordination

olivier EICHWALD (Laboratoire Plasma et Conversion d'Energie) – eichwald@laplace.univ-tlse.fr

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

GREMI Groupe de Recherches sur l'Energétique des Milieux Ionisés
SUPELEC Département Energie
LAPLACE Laboratoire Plasma et Conversion d'Energie

Help of the ANR 489,743 euros
Beginning and duration of the scientific project: December 2012 - 48 Months

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