EP2656921A1 - Elektrostatische Sammelvorrichtung von Suspensionspartikeln in einem gasförmigen Milieu - Google Patents

Elektrostatische Sammelvorrichtung von Suspensionspartikeln in einem gasförmigen Milieu Download PDF

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Publication number
EP2656921A1
EP2656921A1 EP13165303.2A EP13165303A EP2656921A1 EP 2656921 A1 EP2656921 A1 EP 2656921A1 EP 13165303 A EP13165303 A EP 13165303A EP 2656921 A1 EP2656921 A1 EP 2656921A1
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EP
European Patent Office
Prior art keywords
collection
electrode
capillary tube
liquid
collection device
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EP13165303.2A
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English (en)
French (fr)
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EP2656921B1 (de
Inventor
Jean-Maxime Roux
Jean-Luc Achard
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Centre National de la Recherche Scientifique CNRS
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Centre National de la Recherche Scientifique CNRS
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/74—Cleaning the electrodes
    • B03C3/78—Cleaning the electrodes by washing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/16—Plant or installations having external electricity supply wet type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/32—Transportable units, e.g. for cleaning room air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/10—Ionising electrode has multiple serrated ends or parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/18—Magnetic separation whereby the particles are suspended in a liquid

Definitions

  • the present invention relates to an electrostatic device for collecting particles suspended in a gaseous medium, more particularly in air.
  • electrofilters serve for example to purify the air.
  • electrostatic devices for collecting and analyzing particles. These devices show a great efficiency in the collection of submicron particles.
  • electrostatic precipitators some rely on the use of an intense electric field to create a corona discharge effect; they are commonly called electrostatic precipitators or electrostatic precipitators.
  • An electrostatic precipitator is an apparatus that collects particles present in a gas by applying an electric field on a trajectory of particles suspended in this gas. More precisely, this high electric field (several thousands to tens of thousands of volts per centimeter in the vicinity of the discharge electrode) is induced by two electrodes arranged close to each other: a first polarized electrode or electrode of discharge, generally in the form of wire or tip, being disposed facing a second electrode, the latter being in the form of a counter-electrode, generally of planar or cylindrical geometry.
  • the electric field existing between the two electrodes ionizes the volume of gas located in the inter-electrode space, and in particular a sheath or ring of ionized gas located around the discharge electrode.
  • This phenomenon is called corona discharge.
  • the charged particles thus created migrate to the counter electrode, where they can be collected.
  • This counterelectrode is usually called a collection electrode. Due to the level of the required electric field, it is necessary to use a discharge electrode which has a very small radius of curvature. The discharge electrodes encountered are therefore generally either spikes or wires.
  • Electrostatic precipitators use high voltages to generate the corona discharge.
  • an electrostatic precipitator comprises means for driving environmental air through the device and means for transferring particles from a gaseous medium to an aqueous or culture medium.
  • Such a device is for example described in the document WO 2007/012447 .
  • the discharge electrode is formed by a wire disposed within the cylindrical counter-electrode.
  • a tube provides a steam supply between the discharge electrode and the counter electrode.
  • a pump is provided to cause the air and aerosol mixture through the device. This device therefore requires an external pump that does not use high voltage, as well as a steam supply.
  • a device implementing this method comprises two electrodes, formed for one by a capillary bringing the liquid to be sprayed and for the other by a generally flat counter-electrode.
  • the drops thus formed are electrically charged and are dispersed in the air containing the particles to be collected, they transfer their charge to the polar particles which can then be attracted and then collected by the counter-electrode.
  • This device comprises a fan for circulating the air through the device. This fan does not use high voltage.
  • a culture medium can be deposited on the surface of the collection electrode or downstream of the latter.
  • a collection device whose liquid supply is configured to generate both the corona discharge and the electrospray process.
  • the corona discharge charges the particles to be separated for capture on the collection electrode. It also allows the generation of an ionic wind allowing the entrainment of air through the device.
  • the electrospray process generates charged droplets, which enhances the capture efficiency. It also ensures the wetting of the electrode, which makes it possible to retain the particles on the surface of the collection electrode, or, beyond a certain flow rate, the particles run off along the collection electrode. for evacuation or analysis.
  • the collection device no longer requires a pump or fan to drive air or more generally gas through the device, it also does not require special means to ensure the transfer of the medium gaseous in the liquid medium.
  • the means for generating the corona discharge and the means for spraying the liquid by electrospray both use high voltages.
  • the small size of the device makes it compatible with portable use.
  • the means used to generate the corona discharge and those to obtain the electrospray are merged, and the drop of polarized liquid located at the end of the capillary for electrospray spraying forms the tip of the electrode. discharge for the crown discharge.
  • a particle collecting device which, as sole motive force, uses the electric force to perform the gas entrainment, particle collection and gas phase transfer functions to the aqueous phase of the reactor. sample.
  • the corona discharge and the electrospray are combined, which makes it possible to offer a simplified collection device that does not require auxiliary modules, such as a pump, a fan, etc. necessary for the operation of the collection devices of the state of the art.
  • a decontamination function of the electrode can also be performed outside the particle collection phases, for this purpose a liquid capable of decontaminating the surface of the taper-electrode is sprayed with electrospray.
  • the collection device may also include means for evacuation of said gas stream from the collection chamber, said discharge means being located downstream of said collection electrode.
  • the collection chamber is cylindrical, and the collection electrode has a corresponding cylindrical shape.
  • the collection chamber may then be tubular and the collection electrode may have an annular shape whose inner diameter is substantially equal to the inner diameter of the collection chamber.
  • the ratio of the distance between the first end of the capillary tube and the collection electrode on the inside diameter of the collection electrode is advantageously in the range [0.5; 0.75], advantageously equal to 0.56.
  • the collection chamber comprises a tubular side wall and two bottoms forming longitudinal ends, and the admission means are formed by orifices passing through the side wall on the side of a first longitudinal end and the evacuation means are formed in the bottom located at a second longitudinal end.
  • the voltage difference applied between the liquid at the first end of the capillary tube and the collection electrode is in the range [8 kV; 10 kV].
  • the inner surface of the capillary tube is advantageously at least partly made of electrically conductive material and forms the polarization means of the liquid it contains.
  • the capillary tube is made of electrical insulating material and the biasing means are formed by a biasing electrode located inside the capillary tube.
  • the biasing means are located upstream of the capillary tube.
  • the device may advantageously comprise means for decontaminating the collection electrode formed by the capillary tube by spraying, said capillary tube being able to be connected by its second end to a reservoir of a decontamination liquid suitable for be sprayed with electrospray, for example bleach.
  • the collection electrode may be formed by a biological culture medium for the collected particles.
  • the collection device may comprise a plurality of parallel capillary tubes.
  • the collection device then comprises a deflector surrounding the ends of the capillary tubes opening into the collection chamber, said deflector being intended to guide the droplets formed by electrospray.
  • the deflector is formed by a metal ring at the same potential as the liquid.
  • the present invention also relates to a collection system comprising a collection device according to the invention and high voltage supply means for applying the voltage difference or differences.
  • This system can be advantageously portable.
  • the system may include an ion wind generator connected to said collection chamber for increasing the flow rate of gas flowing through the collection chamber, said ion wind generator including a discharge electrode and a counter electrode.
  • the present invention also relates to a collection and analysis system comprising a collection system according to the invention and means for analyzing the particles captured by the collection electrode, said analysis means being located downstream of said collection electrode.
  • FIG. 1 an exemplary embodiment of a collection device according to the invention can be seen schematically.
  • the device comprises a body 2 formed in the example represented by a tube, delimiting a collection chamber 4, admission means 6 of the air in the chamber 4 and air evacuation means 8 of the air. bedroom 4.
  • the tube 2 has a longitudinal axis X; and is provided with an upstream longitudinal end 2.1 and a downstream longitudinal end 2.2.
  • upstream and downstream are considered in relation to the direction of flow of the treated gas through the device which is symbolized by the arrow F, the treated gas flowing from upstream to downstream.
  • the device also comprises means for generating a corona effect inside the chamber 4, and means for spraying a liquid by electrospray, hereinafter referred to as "electrospray means".
  • the means 10 for generating the corona discharge and the electrospray means are merged. We will designate these means by collecting means 10.
  • the collection means 10 comprises a capillary tube 12 arranged, in the example shown, coaxial with the X axis and mounted through a bottom 14 of the upstream end 2.1 of the tube 2.
  • the capillary tube 12 has a downstream end 12.1 opening into the chamber 4 and an upstream end 12.2 intended to be connected to a liquid supply.
  • the liquid is intended to be sprayed with electrospray.
  • the liquid supply is for example obtained by means of a syringe pump or a pump.
  • the drop of liquid 20 present at the downstream end 12.1 of the capillary tube 12 forms the tip of a discharge electrode.
  • the capillary tube 12 may be mounted movably along the axis X so as to allow axial adjustment of the position of its downstream end 12.1 with respect to a collection electrode 16 which will be described below.
  • the discharge electrode is located upstream of the collection electrode.
  • the collection means also comprise means for polarizing the liquid flowing in the capillary tube 12 for the purpose of spraying it.
  • the biasing means are formed directly by the capillary tube 12 which is made of electrically conductive material and which is connected to a source of voltage. This embodiment has the advantage of further reducing the number of elements used in the invention.
  • the capillary tube is connected to ground to avoid any short circuit with external elements.
  • the capillary tube 12 is made of electrical insulating material and that an electrode connected to the voltage source is disposed inside the tube upstream or at the end 12.1 of the tube.
  • the electrode is for example in the form of a wire extending along the axis of the capillary tube 12 or is fixed on the inner wall of the capillary tube.
  • the collection means also comprise a counter electrode 16, also called the collection electrode, disposed downstream of the downstream end 12.1 of the capillary tube 12.
  • the collection electrode 16 is hollow. It extends along the direction of flow and comprises in this direction a first end and a second end, the first and second ends being located downstream of the end 12.1 of the capillary tube 12.
  • Counter-electrode 16 has, in the example shown, the shape of circular section cylinder mounted in the tube 2.
  • the inside diameter of the counter electrode 16 is substantially equal to the inside diameter of the body 2 to reduce discontinuities in diameter in the path of the air flow.
  • the inner surface of the chamber 4 is therefore substantially continuous.
  • the shape of the collection electrode corresponds to at least a portion of the inner surface of the tube.
  • the inner surface 16.1 of the counter-electrode 16 forms the particle collecting surface.
  • the counter electrode is connected to a high voltage source.
  • the counter electrode 16 may take different forms of a cylinder of revolution. It may in particular be in the form of one or more plates, between which open capillaries. It may still have the shape of a cylinder portion, such as a half-cylinder.
  • the admission means 6 comprise orifices formed in the tube between the upstream end 2.1 of the tube and the downstream end of the capillary tube 12.
  • the evacuation means are located opposite intake means 6 with respect to the downstream end 12.1 of the capillary tube 12.
  • the relative position of the edge of the drop of liquid 20 located at the downstream end 16 is such that the distance G separating the downstream end 12.1 of the capillary tube and the upstream end of the counter-electrode is non-zero.
  • Liquid for example water
  • a syringe pump is injected into the capillary tube 12 by means of a syringe pump, a drop of liquid 20 is then formed at the downstream end 12.1 of the capillary tube 12.
  • a high voltage is then applied to the counter electrode 16, while the capillary tube 12 is grounded.
  • the drop 20 is polarized since the capillary tube is electrically conductive.
  • the capillary 12 forms a needle, at the end of which the drop 20 forms a tip, having a strong curvature (or a small radius of curvature).
  • a corona discharge then appears in the vicinity of the drop 20 when the electric field reaches a critical value, this discharge at the end of the drop 20 is visible on the plate of the figure 5 .
  • the corona discharge generates a pocket of ionized gas in the vicinity of the discharge electrode.
  • a unipolar wind of ions and charged particles develops at the drop towards the counter-electrode 16 under the effect of the Coulomb force.
  • the entrainment of the air is done by transfer of momentum between these charged particles and the neutral particles and molecules of the air.
  • the charged particles thus created migrate then to the counter-electrode 16, on which they can be collected.
  • the drop of liquid 20 at the downstream end of the capillary tube 12, which forms the tip of the discharge electrode, is subjected to electrostatic forces which tend to tear it out of the tube, thereby forming an electrospray.
  • the drop 20 is torn off the downstream end 12.1 of the capillary tube 12 when the electrostatic forces surpass the capillary forces, the latter tending to maintain the liquid in the capillary.
  • the electrostatic forces deform the drop to tear it from the downstream end 12.1 of the capillary 12.
  • the drop 20 is then sprayed in droplets of micrometric or nanometric sizes towards the collection electrode 16.
  • the droplets thus formed are electrically charged and are dispersed in the air containing the particles to be collected, they capture the particles circulating in the interelectrode space. The latter are then driven to the collection electrode 16 and then collected by it.
  • the droplets then impact the collection electrode 16, which has the effect of wetting the surface of the collection electrode 16 and forming a film of liquid on the electrode, which ensures the transfer of the particles of the gas phase in the liquid phase.
  • the fact that the collection electrode 16 is wetted improves the capture of the particles. Indeed, it prevents them from being retrained by the air flow.
  • this liquid film makes it possible to recover the particles by runoff along the collection electrode, for the purpose of their analysis or their evacuation.
  • liquid film can serve as a culture medium for biological particles.
  • a liquid intended to be sprayed is used, a liquid favorable to the survival of microorganisms. organisms, such as, for example, an aqueous solution comprising a 1X PBS saline buffer and a 0.1% Triton X surfactant.
  • the collection of the particles is therefore carried out both by corona and the droplets formed by electrospray.
  • the production of ozone is reduced compared to a collection device using only the corona discharge.
  • the potential difference applied is between 8 kV and 10 kV.
  • the sprayed droplets are sufficiently deflected to reach the collection electrode and collapse on the inner surface of the collection electrode and form a liquid film on the inner surface of the collection electrode. This potential range ensures maximum particle collection.
  • droplets are not sufficiently deflected, they pass through the collection electrode and collapse on the inside wall of the downstream tube. the collection electrode. These particles are not collected.
  • the ratio G / D is greater than or equal to 0.2, preferably greater than 0.5.
  • the ratio G / D is such that: 0.5 ⁇ G / D ⁇ 0.75, and more preferably G / D is close to 0.5, for example equal to 0.56.
  • the ratio L / R is chosen too low, for example less than or equal to 0.49, the deflection of at least a portion of the droplets may be too great, they then crash on the upstream end of the collection electrode, the liquid can accumulate. This liquid then forms an extension of the collection electrode towards the discharge electrode, which may have the effect of reducing the distance between the discharge electrode and the collection electrode, which can cause the formation electric arcs. The length of the drop is therefore taken into account in the dimensioning of the device.
  • the liquid end of the capillary tube forms both the discharge electrode for the corona discharge and ensures the electrospray effect.
  • the device according to the invention comprises means for decontaminating the collection electrode between two capture cycles, for example between two cycles of pathogen capture, thus making the device reusable.
  • the capillary tube 12 and the electrospray effect are used to water the inner wall of the collection electrode 16 with a suitable fluid, for example bleach, which is a highly conductive aqueous solution.
  • a suitable fluid for example bleach, which is a highly conductive aqueous solution.
  • Decontamination with bleach can be carried out very simply at the same operating point as the collection, by applying the same values of voltage difference, the same liquid flow and the same distance G.
  • a solenoid valve is located between the upstream end 12.2 of the capillary tube and controls the supply of fluid depending on the desired cycle, either to perform a collection cycle, or to perform a cycle of decontamination.
  • the variation of the flow rate Db within the collection device according to the invention can be seen having a G / D ratio of 0.56 as a function of the voltage V applied to the collection electrode (the discharge electrode being the mass), the flow rate results from the flow obtained by the corona discharge and the structure according to the invention.
  • the measurements are made in the case where the liquid is PBS 1X + 0.1% Triton X (curve I) and in the case where the liquid is salt water (curve II). Thanks to the invention, a flow rate of more than 2 l / min is obtained for a voltage at the collection electrode greater than or equal to 8kV.
  • Triton X Salt water and PBS 1X + 0.1% Triton X are two highly electrically conductive liquids. It is observed thanks to these measurements that the device is very robust to the change of liquid as soon as it is highly electrically conductive. The device can therefore be used with a large number of liquids, which makes its field of application very wide in terms of particles that can be collected.
  • the collection device according to the invention operates with a G / D ratio of 0.49 and a voltage difference of less than or equal to 9.5 kV.
  • Tables T1 and T2 show the sensor efficiency of the device according to the invention.
  • an isokinetic sampling rod connected to a particle counter is used, the assembly being placed downstream of the collection electrode and two measurement series are carried out.
  • a measurement series is performed with the collection device turned off and a series of measurements is performed with the collection device in operation.
  • N Off ⁇ N 0 where No is the concentration of the aerosol in the ambient air.
  • Table T1 Average Number of Particles per Liter of Air for Collector Off ⁇ i> (N ⁇ sub> Off ⁇ / sub>) ⁇ / i> and in Operation ⁇ i> (N ⁇ sub> On ⁇ / sub>) ⁇ / i> ⁇ /b> Voltage applied to the collection electrode State of the collection device Average number of particles per liter of air collected cane having a size between 0.25-0.28 ⁇ m 0.35-0.40 ⁇ m 0.70-0.80 ⁇ m 3.5-4 ⁇ m 10 kV N Off 136192 625925 405650 2900 N On 7 8 0 0 7 kV N Off 127727 406263 351969 2670 N On 470 247 331 0 4 kV N Off 127727 180183 232885 827 N On 470 394 531 1
  • Table T2 summarizes the efficiencies for some ranges of particle diameter collected. Efficiency values similar to those presented in this table T2, that is to say very close to 1, are also recorded for the other measurement channels.
  • Table T2 Some Capture Efficiency Values ⁇ / b> Voltage applied to the collection electrode Measured airflow (l / min) Total air flow (L / min) 0.25-0.28 ⁇ m Efficiency (%) 0.35-0.40 ⁇ m Efficiency (%) 0.70-0.80 ⁇ m Efficiency (%) 3.5-4 ⁇ m Efficiency (%) Average efficiency (%) 10 kV 3.7 ⁇ 0.2 4.9 ⁇ 0.2 99.99 99.99 100 100 99.99 7kV 1.8 ⁇ 0.2 3 ⁇ 0.2 99.83 99.93 99,90 100 99.93 4kV 0.2 ⁇ 0.2 1.4 ⁇ 0.2 99.63 99.78 99.77 99.9 99.83
  • the flow measured is that indicated by a flow meter downstream of the rod.
  • the total flow rate is equal to the sum of the flow rate measured by the flowmeter and the suction flow rate of the particle counter (1.2 l / min).
  • the produced airflow and the capture voltage are coupled as shown by the figure 3A so that at 4 kV, potential for which the corona discharge does not appear, the air entrainment produced by the collection device according to the invention is almost zero.
  • the device may include a plurality of capillary tubes to increase the flow of liquid sprayed on the inner wall of the collection electrode. This allows runoff of the particles collected along the collection electrode 16.
  • the device comprises a deflector guiding the sprayed drops to the collection electrode.
  • this deflector 22 is a metal ring disposed around the capillary tubes 12 at their downstream ends 12.1.
  • the deflector 22 is at the same electrical potential as the tips of the capillaries.
  • the deflector 22 Since the deflector 22 is polarized in the same way as the ends of the capillaries, field lines are formed between this deflector 22 and the counter electrode 18. These field lines act as an electrostatic channel and force the droplets to move towards the counter-electrode 16. In the absence of such a deflector, the drops, which have the same polarity, would tend to repel each other, which would give a divergent beam of drops. With the deflector, the field lines formed by between the deflector and the counter-electrode exert a repulsive force on the drops, so that the drops are held in the conical envelope formed by the field lines.
  • the collection electrode 16 is, in the example shown, formed by a metal tube. Preferably, the edges of the longitudinal ends are rounded to reduce the risk of generating electric shocks.
  • This collection electrode may be made of any conductive material, such as a metallic material or non-metallic materials such as a gel or a conductive membrane whose electrical potential is fixed by the electrical means accompanying the device. These supports non-metallic may be for example a biological culture medium, so the electrode is directly favorable to the culture of microorganism.
  • the collection device according to the invention is particularly suitable for the use of collection electrode directly forming a culture medium.
  • the electrospray spraying obtained by virtue of the invention advantageously ensures the humidification of the culture medium during the collection to avoid drying out and increases the total duration of sampling. It has been found that the drying of the culture medium limits the total duration of sampling, generally to about ten minutes.
  • the collection electrode may also consist of an annular support or electrically conductive cylinder and covered with a thin electrical insulator, typically less than 500 ⁇ m thick.
  • the liquid ejected by electrospray is for example water.
  • an aqueous solution favorable to survival and / or the culture of microorganisms such as for example saline, a solution of phosphate buffered saline (buffered phosphate saline or PBS), an aqueous solution containing at least one antioxidant.
  • the discharge electrode may have the shape of one or more points, in order to increase the flow of air entrained.
  • the collection device can of course be associated with means for analyzing the collected particles and being in the liquid phase on the collection electrode.
  • the analysis means generally used in the field of analysis of airborne particles are suitable and will not be described in detail here.
  • a collection device with a high compactness and extremely low power consumption, for example of the order of 400 mW.
  • This one can thus be integrated in a portable case of the order of 10 cm 3 adapted to a nomadic use for the detection of pathogens in the most diverse contexts: hospital, industrial (biomedical, agronomy %) or for the fight against bioterrorism.

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  • Electrostatic Spraying Apparatus (AREA)
  • Electrostatic Separation (AREA)
EP13165303.2A 2012-04-27 2013-04-25 Elektrostatische Sammelvorrichtung von Suspensionspartikeln in einem gasförmigen Milieu Active EP2656921B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1253945A FR2989905B1 (fr) 2012-04-27 2012-04-27 Dispositif electrostatique de collecte de particules en suspension dans un milieu gazeux

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EP2656921A1 true EP2656921A1 (de) 2013-10-30
EP2656921B1 EP2656921B1 (de) 2018-03-14

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US9200987B2 (en) * 2010-04-19 2015-12-01 Battelle Memorial Institute Electrohydrodynamic spraying
FR2991593B1 (fr) 2012-06-11 2017-09-15 Commissariat Energie Atomique Dispositif de fractionnement d'un fluide comportant des particules et d'extraction d'un volume d'interet
JP6526461B2 (ja) * 2015-03-30 2019-06-05 三菱重工業株式会社 電気集塵機及び原子力プラント
CN205518200U (zh) * 2016-01-29 2016-08-31 深圳嘉润茂电子有限公司 高速离子风自吸式低温等离子体空气净化设备
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US9259742B2 (en) 2016-02-16
US20130284024A1 (en) 2013-10-31
EP2656921B1 (de) 2018-03-14
FR2989905A1 (fr) 2013-11-01

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