Pollution Control and Depollution Processes by Plasma Techniques

Amouroux, J.; Morvan, Daniel; Cavadias, S.; Adam, P.; Gonnord, M. F.; Coulibaly, K.; Vincent, A.; Morel, Stéphane; Daou, F.; Ognier, Stéphanie; Rousseau, P.; Martin, Leigh R.

doi:10.1134/1.1927215

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…[1][2][3][4] In recent years, with the increasingly serious air pollution, corona discharge has attracted broad attention for its application in atmospheric controlling. [5][6][7][8] In the needle-plate model, when a certain range of negative voltage is applied to the electrode with smaller curvature radius, a chain of regular pulses with short rising time and relatively long intervals can be observed, also known as Trichel pulses. [9][10][11][12] Experiments [13][14][15][16] and numerical simulations [17][18][19][20][21] were carried out to study this issue these years.…”

Section: Introductionmentioning

confidence: 99%

Comparison of discharge mechanism of negative corona between hyperboloid and hemispherical electrodes

Zhu

2018

AIP Advances

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Electrostatic precipitators based on corona discharge are a research hotspot in recent years. It is of great significance to investigate the characteristics of corona discharge under different system parameters for improving the dust removal efficiency. In this manuscript, the continuity equations coupled with Poisson’s equation are solved by the finite element method (FEM) to explore the different mechanisms of the generation of Trichel pulses when hyperboloid and hemispherical electrodes are used in negative corona discharges for a needle-plate configuration under atmospheric pressure. The fitting curve of the Trichel pulse frequency versus systematic macro parameters, including the applied voltage, the needle tip radius and the needle-plate distance, are given and their mechanisms are analyzed. Subsequently, the features of the Trichel pulses of the hyperboloid electrode and the hemispherical electrode at similar power are compared. From precipitation point of view, the hemispherical electrode is obviously better than hyperboloid electrode.

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Section: Introductionmentioning

confidence: 99%

Comparison of discharge mechanism of negative corona between hyperboloid and hemispherical electrodes

Zhu

2018

AIP Advances

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“…These molecules are often considered as endocrine disrupters, toxic, persistent, and refractory to classical water treatment processes. − To provide a solution to this problem, processes promoting the production of radical species such as hydroxyl radicals are being developed. The main characteristics of hydroxyl radicals are (i) a high reactivity toward a large spectrum of compounds ( k HO ≈ 10 9 M –1 ·s –1 ), (ii) a nonselectivity, and (iii) its utilization does not need an elimination post-treatment due to is nonresidual character. , There are different classes of advanced oxidation processes (AOPs) such as photocatalysis, , the Fenton-based process, catalytic ozonation, and the plasma-based process. , Table lists the major advantages and drawbacks of the different AOPs.…”

Section: Introductionmentioning

confidence: 99%

“…5,6 There are different classes of advanced oxidation processes (AOPs) such as photocatalysis, 7,8 the Fenton-based process, 9 catalytic ozonation, 10 and the plasma-based process. 11,12 The main advantage of the plasma-based process comes from the production mode of the radical species. In presence of water (vapor, liquid, droplets), oxidant radical species such as HO • can be produced directly in an electrical discharge by direct electronic impact (reaction r1) or radical reactions (r2 and r3).…”

Section: Introductionmentioning

confidence: 99%

Degradation of 4-Chlorobenzoïc Acid in a Thin Falling Film Dielectric Barrier Discharge Reactor

Lesage

Roques-Carmes

Commenge

et al. 2014

Ind. Eng. Chem. Res.

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The degradation of 4-chlorobenzoi ̈c acid (4-CBA) in water was performed using an innovative plasma dielectric barrier discharge (DBD) process. The influence of the electrode material directly in contact with the solution was examined. The roles of power and frequency discharge on the treatment efficiency were also evaluated. The hydrodynamic behavior of the solution and physical aspect of the discharge were studied by contact angle measurements and intensified charge-coupled device (iCCD) acquisition, respectively. Analyses showed that the use of stainless steel (SS) resulted in a better efficiency of the process compared with the use of brass (B). The degradation of 4-CBA was 80 and 50% for SS and B, respectively, after 1 h of plasma discharge. The presence of NO x in the plasma discharge and corrosion reaction occurring on the brass surface limited the degradation of the 4-CBA. It was possible to observe two main byproducts and identify the 4-chlorosalicylic acid or 4chlorohydroxybenzoi ̈c acid. Ultimately, the discharge frequency was reduced to limit the production of NO x species.

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“…Inductively coupled plasma torches have been widely used both for laboratory-scale studies and for successful industrial applications, thanks to their unique characteristics: high energy density, high volume, high purity and high scalability [1]. The range of possible applications includes powder spheroidization [2][3][4], waste treatment [5,6], thermal sprays [7,8], while, in the last decade, increasing attention has been given to synthesis of nano-powders [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional investigation of particle treatment in an RF thermal plasma with reaction chamber

Colombo¹,

Ghedini²,

Sanibondi³

2010

Plasma Sources Sci. Technol.

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Particle treatment in a commercial inductively coupled plasma torch with a non-axisymmetric reaction chamber has been studied using a three-dimensional numerical model, including particle turbulent dispersion. Computations have been performed for two different coil current frequencies (3 and 13.56 MHz), showing that for lower frequencies particle trajectories deviate from their initial axial direction as a consequence of non-axisymmetric thermo-fluid-dynamic fields: these effects arise when the first and last coil turns induce unbalanced Lorentz forces in the discharge that prevail over fluid-dynamic inertia. For higher frequencies, almost axial particle trajectories have been predicted.Moreover, computations for different mass flow rates of the precursor particles and for different axial positions of the injection probe are shown, these parameters having an important influence on the effectiveness of the powder treatment process.

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Pollution Control and Depollution Processes by Plasma Techniques

Cited by 7 publications

References 2 publications

Comparison of discharge mechanism of negative corona between hyperboloid and hemispherical electrodes

Comparison of discharge mechanism of negative corona between hyperboloid and hemispherical electrodes

Degradation of 4-Chlorobenzoïc Acid in a Thin Falling Film Dielectric Barrier Discharge Reactor

Three-dimensional investigation of particle treatment in an RF thermal plasma with reaction chamber

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