EP2772309B1 - Dispositif de séparation de particules à partir d'un flux de gaz chargé de particules et procédé - Google Patents

Dispositif de séparation de particules à partir d'un flux de gaz chargé de particules et procédé Download PDF

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Publication number
EP2772309B1
EP2772309B1 EP13157441.0A EP13157441A EP2772309B1 EP 2772309 B1 EP2772309 B1 EP 2772309B1 EP 13157441 A EP13157441 A EP 13157441A EP 2772309 B1 EP2772309 B1 EP 2772309B1
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EP
European Patent Office
Prior art keywords
electrode
particles
flow channel
counter electrode
accordance
Prior art date
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EP13157441.0A
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German (de)
English (en)
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EP2772309A1 (fr
Inventor
Ulrich Prof. Dr. Ing. Riebel
Volodymyr Lebedynskyy
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Brandenburgische Technische Universitaet Cottbus
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Brandenburgische Technische Universitaet Cottbus
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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
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/06—Plant or installations having external electricity supply dry type characterised by presence of stationary tube 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
    • 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
    • B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
    • 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
    • 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
    • B03C3/45—Collecting-electrodes
    • B03C3/49—Collecting-electrodes tubular
    • 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
    • B03C3/66—Applications of electricity supply techniques
    • B03C3/68—Control systems therefor
    • 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
    • B03C2201/04—Ionising electrode being a wire
    • 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 with two or more serrated ends or sides
    • 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
    • B03C2201/24—Details of magnetic or electrostatic separation for measuring or calculating of parameters, e.g. efficiency

Definitions

  • the invention relates to a device for separating particles from a particle-laden gas stream, in particular an electrostatic precipitator and a method for separating particles from a particle-laden gas stream.
  • electrostatic precipitators in various forms are known in the prior art, for example as tube electrostatic precipitators or as plate electrostatic precipitators.
  • corona quenching occurs at high particle concentrations, which reduces the separation efficiency.
  • One way to improve the separation efficiency is a bipolar charging of the gas stream or aerosol to achieve an agglomeration.
  • it is known to charge the aerosol bipolarly by means of separate high-voltage electrodes.
  • the separate electrodes are either installed in a common channel or in separate channels, with the differently charged gas streams subsequently being mixed.
  • an embodiment is known, wherein the separate electrodes are arranged one behind the other and after passing through the electrodes a subsequent mixing takes place. It is also known to accelerate the agglomeration by superimposed alternating fields.
  • An apparatus and method for bipolar charging of an aerosol is disclosed in the document DE 44 00 827 C1 known.
  • the aerosol is passed through a flow channel in which at least one pair of electrodes is arranged.
  • One electrode of the pair is earth-free connected to the positive pole of a voltage source and the other electrode is connected to the negative pole floating.
  • the tips of the electrodes face each other.
  • a corona discharge is formed, whereby the aerosol is charged almost symmetrically bipolar.
  • a symmetrical loading of the aerosol with positive and negative ions only achieves a low net charge of the aerosol, which is insufficient for rapid deposition. The latter is also undesirable in the agglomeration process according to the prior art, since here the agglomeration product is to be transported away with the gas phase.
  • the device comprises a first electrode, which bears against a first potential, and a second electrode, which bears against a second potential.
  • the first electrode is configured to form a corona discharge, thereby charging the aerosol. Charged particles of the aerosol settle on the second electrode and are excreted.
  • the document DE 36 09 698 A1 discloses an apparatus and method for ionizing or neutralizing a gas stream. In separate zones, ions of both polarities are generated. The gas stream flows out of the device in positive and negative layers.
  • the document DE 195 24 214 A1 discloses an electrostatic filter with negative corona in the entrance area. This ammonia is filtered from flue gas.
  • the document DE 10 2008 009 258 A1 discloses a method and apparatus for energetically optimized separation of aerosols in a two-stage electrostatic precipitator.
  • the object of the invention is to provide improved technologies for the separation of particles.
  • the influence of the corona quenching is to be overcome in order to achieve a good separation in a small construction volume.
  • an apparatus for separating particles from a particle-laden gas stream in particular an electrostatic precipitator.
  • the device has a flow channel, with an inlet region into which the particle-laden gas stream enters, and an outlet region from which the gas stream, which is at least partially purified from the particles, emerges.
  • a spray electrode Arranged in the flow channel is a spray electrode, which is electrically connected to a high voltage source, such that when a high voltage is applied, a first corona discharge at the spray electrode is trained.
  • a precipitation electrode is formed, which is applied to the ground potential, and at which electrically charged particles are deposited from the gas stream.
  • At least one counter electrode is arranged, which is electrically connected to the collecting electrode and is also at earth potential.
  • the at least one counterelectrode is configured to form a second corona discharge when a boundary field strength of the electric field is exceeded due to a particle space charge in the region of the counterelectrode, which is polarized opposite to the first corona discharge.
  • a kit for retrofitting an electrostatic precipitator wherein the electrostatic precipitator includes a flow channel, a spray electrode, and a precipitation electrode.
  • the kit includes at least one counter electrode which is installable in the flow channel, electrically connected after installation to the collecting electrode and at the ground potential.
  • the at least one counterelectrode is configured to form a corona discharge when a boundary field strength of the electric field is exceeded due to a particle space charge in the region of the counterelectrode, which is polarized opposite to a corona discharge of the spray electrode.
  • a method of separating particles from a particle-laden gas stream comprises the steps of: introducing the particulate laden gas stream into a flow channel through an entrance region, forming a first corona discharge by means of a spray electrode disposed in the flow channel and electrically connected to a high voltage source, charging the particles in the first corona discharge so that the charged particles depositing on a precipitation electrode adjacent to the ground potential, forming a second corona discharge, which is poled opposite to the first corona discharge when a field strength limit of the electric field due to a particle space charge in the region of the collecting electrode is exceeded, and discharging the at least partially purified from the particles gas stream the flow channel through an exit area.
  • At least one counterelectrode can be arranged in the flow channel, which is electrically connected to the collecting electrode and is at earth potential.
  • the at least one counterelectrode can be arranged in the vicinity of the precipitation electrode or connected directly to it.
  • the at least one counterelectrode can be configured to form the second corona discharge when a limiting field strength of the electric field is exceeded due to a particle space charge in the region of the counterelectrode.
  • the particle-laden gas stream forms an aerosol.
  • the particles may be in solid or liquid state.
  • the particles are at least partially removed from the gas stream.
  • the gas particles are ionized.
  • the gas ions accumulate on the particles in the gas stream, so that charged particles are formed.
  • the charged particles migrate to the collecting electrode and settle there, for example in the form of a dust layer.
  • the cleaning of the precipitation electrode can be used as dry cleaning, for example, by tapping, or wet cleaning, for example by rinsing with water done.
  • the electric field in the flow channel is essentially determined by the static field of the spray electrode and the space charge field of the gas ions.
  • the particle space charge formed by the charged particles is low at low concentrations and has little effect on the electric field and operation of the device. Under these conditions, no second corona discharge is triggered at the at least one counterelectrode yet.
  • gas ions are formed in the region of the at least one counterelectrode, which are charged opposite to the gas ions formed in the first corona discharge.
  • the oppositely charged gas ions accumulate on the particles, so that a polarity charged with opposite polarity space charge arises.
  • the opposite-polar space charges attract each other and there is a very rapid mixing of the oppositely charged aerosols.
  • the total space charge is reduced very quickly.
  • the oppositely charged particles move alternately and agglomerate to larger, electrically neutral particles. An agglomeration process is thus carried out in parallel with the quenched operation. The total particle concentration decreases as a result, and the larger particles are easier to deposit.
  • Reducing the total space charge at least partially reverses corona quenching and the spray electrode can recharge the gas stream.
  • the second corona discharge is terminated at the at least one counter electrode.
  • the counterelectrode automatically returns to an "inactive" state. An energy-intensive agglomeration Bipolar charging of the aerosol is thus triggered accurately and only if the concentration of the particles is so great that corona quenching occurs.
  • the construction volume of a device according to the invention is smaller by a factor of 2 to 4 than the construction volume of an electrostatic precipitator known from the prior art which operates exclusively in unipolar operation (and under quenched conditions).
  • the configuration of the at least one counterelectrode is effected by a suitable choice of the shape and the associated dimensions, for example diameter, length and surface radii.
  • the spray electrode may be arranged, for example, in the center of the flow channel. Alternatively it can be provided that the spray electrode is arranged deviating from the center of the flow channel.
  • the spray electrode may be formed as a single wire. Alternatively or additionally, the spray electrode may be formed star-shaped or from plates which are arranged at an angle to each other. A positive or a negative high voltage can be applied to the spray electrode by means of the high-voltage source. It is also possible to arrange a plurality of spray electrodes in the flow channel, which can all have the same shape or a combination of the aforementioned shapes.
  • the at least one counter electrode is arranged in the input region of the flow channel.
  • the high particle concentrations, which lead to corona quenching, usually occur in the entrance area.
  • the adverse effects of the quenched operation can be counteracted by suitable placement of the at least one counter electrode.
  • the output region of the flow channel is free of counterelectrodes in order to save material and energy during operation of the device.
  • the at least one counterelectrode is formed as a tip or edge.
  • a pointed counter electrode is in the form of a pin, the length of the electrode being larger than the diameter.
  • An end of the tip projecting into the flow channel has a rounding diameter that is smaller than the diameter of the electrode shaft.
  • the counter electrode may be formed as an elongate edge of a surface which projects into the flow channel. The tip or edge can be arranged directly on the collecting electrode.
  • the at least one counterelectrode is formed as a tensioned wire or as a wire grid.
  • the counterelectrode in the form of a wire or wire grid may be arranged in the flow channel such that it is spaced from the collecting electrode.
  • the concrete shape and design of the at least one counter electrode should be in relation to the design of the device.
  • its length may be about 2% to 10% of the diameter or cross-section of the flow channel.
  • the diameter of the tip may be between 0.5 and 5 mm and the tip radius between 0.05 mm and 0.5 mm.
  • the values for the diameter and the tip radius are preferably less than or equal to the corresponding values for the spray electrode.
  • the above-mentioned shapes for the counter electrodes can be arbitrarily combined with each other. Alternatively it can be provided that all counter-electrodes have the same shape.
  • a current measuring device is connected to the at least one counterelectrode in order to measure the current flowing out via the counterelectrode. This allows monitoring of the operating state of the counter electrode, from which measures for process control can be derived. For example, can be displayed by means of a display device that the counter electrode has activated and a corona discharge takes place.
  • the flow channel is formed within a tube.
  • the tube may have, for example, a circular, an oval, a square or a rectangular cross-section.
  • further cross sections are conceivable.
  • a plurality of counter electrodes are arranged symmetrically with respect to the cross section of the tube.
  • three counterelectrodes may be arranged along the inner wall of the tube with a uniform spacing.
  • a plurality of counter electrodes may not be arranged symmetrically with respect to the cross section of the tube.
  • a non-symmetrical arrangement can lead to improved cross-mixing of the aerosol.
  • the distance between the spray electrode and the collecting electrode is smaller than the distance between the spray electrode and the at least one counter electrode. This arrangement is especially for rectangular or square Cross-sections advantageous because flashovers between the at least one counter electrode and the spray electrode are thereby prevented.
  • the flow channel is bounded by a first plate and a second plate, which are opposite, and wherein at least one counter electrode is arranged on the first and second plate.
  • a first plate and a second plate which are opposite, and wherein at least one counter electrode is arranged on the first and second plate.
  • Such an arrangement is also referred to as a plate electrostatic precipitator.
  • a plurality of counter electrodes arranged on the first plate are arranged offset along the flow direction to a plurality of counter electrodes arranged on the second plate. The staggered arrangement of the counter electrodes improves the cross-mixing of the aerosol and reduces the risk of flashover between the spray electrode and the counter electrodes.
  • the aforementioned features apply to the kit for retrofitting an electrostatic precipitator accordingly.
  • the method can be carried out with a device having the aforementioned features.
  • Fig. 1 shows a schematic representation of a Rohrelektroabscheiders.
  • a flow channel 1 has an inlet region 2, into which a particle-laden gas stream enters the separator.
  • the gas stream which is at least partially cleaned of particles, exits the separator again via an outlet region 3.
  • a star-shaped spray electrode 4 is suspended, which is connected to a high voltage source (not shown).
  • the high voltage source may provide a positive or a negative high voltage.
  • the spray electrode 4 may alternatively be formed as a wire or from each other arranged in angled plates. When a sufficiently high voltage is applied to the spray electrode 4, a first corona discharge is formed. Gas particles ionize in the first corona discharge and accumulate on particles, forming charged particles.
  • a precipitation electrode 5 On the inner wall of the tube, a precipitation electrode 5 is formed, which abuts the ground potential. The charged particles collect on the precipitation electrode 5 and are removed from the gas stream. On the collecting electrode 5 a plurality of counter electrodes 6 are fixed, which protrude into the flow channel 1. If, at a high particle concentration, the electric field strength exceeds a critical value in the region of the counterelectrodes 6, a respective second corona discharge forms at the counterelectrodes 6, which is polarized opposite to the first corona discharge of the spray electrode 4. This leads to a bipolar agglomeration of differently charged particles. Particles excreted from the gas stream are discharged by means of an opening 7.
  • the counterelectrodes 6 are preferably arranged in the input region 2.
  • the agglomeration and the favorable cross-mixing increase the separation efficiency of the separator.
  • Fig. 2 is the qualitative, radial course of the electric field strength in a Rohrelektroabscheider shown under different operating conditions.
  • the curves 8 and 9 relate to a conventional separator having no counter electrodes. Curve 8 shows the course at a low particle concentration. The course at a high particle concentration is shown by curve 9. Here comes the Corona Quenching.
  • the influence of the at least one counterelectrode on the inner wall of the separator (ie at maximum radius) on the course at high particle concentrations is shown in FIG. 10.
  • Fig. 3 shows the cross section of a tube electrodepositioner with a spray electrode 4, a collecting electrode 5 and three counter electrodes 6, which are formed on the collecting electrode 5.
  • the spray electrode 4 is in the form of a thin wire.
  • the counter electrodes 6 are formed as sharp points. With sufficiently high field strength in the region of the counter electrodes 6, these are activated automatically.
  • Fig. 4 shows the zones of negative space charge 11 and positive space charge 12 for the separator after Fig. 3 at high particle concentrations, when 6 corona discharges occur at the counter electrodes.
  • Fig. 5 shows another tube electrode.
  • the spray electrode 4 is not positioned in the center.
  • the counter electrode 6 is located at a greater distance from the spray electrode 4 than in the Fig. 3 illustrated embodiment. This is advantageous at low aerosol concentrations since electrical flashovers occur later. In addition, this design favors the transport of oppositely charged particles to each other.
  • the spray electrode 4 is formed from mutually angled plates, for example, from sharp-edged sheet metal. Due to the staggered arrangement of the electrodes, a directed circulation flow 13 is generated in the radial direction, which leads to rapid mixing and agglomeration of the oppositely charged particles.
  • Fig. 7 a rectangular electrostatic precipitator is shown.
  • the counter electrode can be attached to different locations. Suitable placement points for one or more counter electrodes are labeled a, b and c.
  • the counterelectrodes 6 are farther away from the spraying electrode 4 than the distance between the spraying electrode 4 and the precipitating electrode 5 formed on the wall in order to exclude flashovers between the counterelectrodes 6 and the spraying electrode 4.
  • Fig. 8 shows another simple geometry of the counter electrode 6 in a rectangular electrostatic precipitator.
  • the counter electrode 6 is formed as a thin, parallel to the collecting electrode 5 stretched wire.
  • the counter electrode 6 may be formed as a grid fixed on the collecting electrode 5.
  • a display device is displayed. This is in Fig. 9 shown. If the current exceeds a certain value, it is indicated, for example, that the counter electrode 6 has activated and a corona discharge takes place.
  • Fig. 10 shows a equipped with counter electrodes 6 Plattenelektroabscheider.
  • the advantageous staggered arrangement of the counter electrodes 6 improves the cross-mixing of the gas flow and reduces the risk of flashover between the spray electrode 4 and the counter electrodes 6.
  • Fig. 11 Another plate electrostatic precipitator is shown.
  • the flow direction of the gas stream to be cleaned is indicated by arrows.
  • the counter electrodes 6 are realized here by a wire mesh or by tensioned wires.
  • the precipitation electrodes 5 can be omitted in the area with the counterelectrodes 6, since no wall is required for guiding the gas flow or for delimiting the adjacent gas flows.
  • the counterelectrodes 6 are used only in the input area 2 and / or in the vicinity of the raw gas inlet (where a high aerosol concentration is to be expected).
  • the use of counterelectrodes 6 is advantageously dispensed with in the vicinity of the clean gas outlet 3.
  • the counter electrodes 6 are attached to the collecting electrode 5.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)

Claims (12)

  1. Dispositif pour la séparation de particules d'un flux de gaz chargé avec des particules, avec :
    - un canal d'écoulement (1) avec une zone d'entrée (2) dans laquelle entre le flux de gaz chargé en particules, et une zone de sortie (3) de laquelle sort le flux de gaz au moins partiellement nettoyé de ses particules,
    - une électrode à couronne (4) disposée dans le canal d'écoulement (1), laquelle est connectée électriquement à une source de haute tension de manière à ce que, lors de l'application d'une haute tension, une première décharge en couronne est réalisée au niveau de l'électrode à couronne (4),
    - une électrode de dépôt (5) pour la fixation par addition de particules chargées électriquement à partir du flux de gaz, laquelle se trouve au potentiel de terre, et
    - au moins une contre-électrode (6) disposée dans le canal d'écoulement (1),
    caractérisé en ce que
    - cette au moins une contre-électrode est connectée électriquement à l'électrode de dépôt (5) et se trouve également au potentiel de terre, et en ce que
    - cette au moins une contre-électrode (6) est configurée, en cas de dépassement par le haut d'une intensité de champ limite du champ électrique en raison d'une charge d'espace en particules dans la zone de la contre-électrode (6), pour réaliser une deuxième décharge en couronne qui est polarisée de manière opposée à la première décharge en couronne.
  2. Dispositif selon la revendication 1, dans lequel cette au moins une contre-électrode (6) est disposée dans la zone d'entrée du canal d'écoulement.
  3. Dispositif selon la revendication 1 ou 2, dans lequel cette au moins une contre-électrode (6) est formée en tant que pointe ou arête.
  4. Dispositif selon la revendication 1 ou 2, dans lequel cette au moins une contre-électrode (6) est formée en tant que fil métallique tendu ou en tant que treillis en fils métalliques.
  5. Dispositif selon l'une des revendications précédentes, dans lequel un dispositif de mesure de courant (14) est raccordé à cette au moins une contre-électrode (6) afin de mesurer le courant passant par la contre-électrode (6).
  6. Dispositif selon l'une des revendications précédentes, dans lequel le canal d'écoulement (1) est formé à l'intérieur d'un conduit.
  7. Dispositif selon la revendication 6, dans lequel plusieurs contre-électrodes (6) sont disposées symétriquement compte tenu de la section transversale du conduit.
  8. Dispositif selon la revendication 6, dans lequel plusieurs contre-électrodes (6) sont disposées de manière non symétrique compte tenu de la section transversale du conduit.
  9. Dispositif selon la revendication 6, dans lequel l'espacement entre l'électrode à couronne (4) et l'électrode de dépôt (5) est plus petit que l'espacement entre l'électrode à couronne (4) et cette au moins une contre-électrode (6).
  10. Dispositif selon l'une des revendications 1 à 5, dans lequel le canal d'écoulement (1) est délimité par une première plaque et une deuxième plaque, lesquelles se situent en vis-à-vis l'une de l'autre, et dans lequel respectivement au moins une contre-électrode (6) est disposée au niveau de la première plaque et de la deuxième plaque.
  11. Dispositif selon la revendication 10, dans lequel plusieurs contre-électrodes (6) disposées au niveau de la première plaque sont disposées le long de la direction d'écoulement de manière décalée par rapport à plusieurs contre-électrodes (6) disposées au niveau de la deuxième plaque.
  12. Procédé pour séparer des particules d'un flux de gaz chargé avec des particules, avec les étapes suivantes :
    - introduction du flux de gaz chargé en particules dans un canal d'écoulement (1) via la zone d'entrée (2),
    - réalisation d'une première décharge en couronne au moyen d'une électrode à couronne (4) disposée dans le canal d'écoulement (1) et connectée électriquement à une source de haute tension,
    - chargement des particules lors de la première décharge en couronne, de sorte que les particules chargées se déposent sur une électrode de dépôt (5) se trouvant au potentiel de terre,
    - réalisation d'une deuxième décharge en couronne au niveau d'une contre-électrode (6) disposée dans le canal d'écoulement (1), la contre-électrode (6) étant connectée électriquement à l'électrode de dépôt (5) et se trouvant également au potentiel de terre, et la deuxième décharge en couronne étant polarisée de manière opposée par rapport à la première décharge en couronne lorsqu'une intensité de champ limite du champ électrique est dépassée par le haut en raison d'une charge d'espace en particules dans la zone de l'électrode de dépôt (5), et
    - évacuation du flux de gaz, ayant été au moins partiellement nettoyée de ses particules, du canal d'écoulement (1) via une zone de sortie (3).
EP13157441.0A 2013-03-01 2013-03-01 Dispositif de séparation de particules à partir d'un flux de gaz chargé de particules et procédé Not-in-force EP2772309B1 (fr)

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EP2772309B1 true EP2772309B1 (fr) 2015-06-03

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609698A1 (de) * 1986-03-19 1987-09-24 Dumitru Dr Ing Cucu Vorrichtung und verfahren zur ionisierung oder neutralisation eines gasstroms und der in ihm enthaltenen partikel
DE4400827C1 (de) 1994-01-13 1995-04-20 Andreas Dipl Ing Gutsch Verfahren und Vorrichtung zur elektrisch induzierten Agglomeration gasgetragener Partikeln
DE19524214A1 (de) * 1995-07-03 1997-01-09 Abb Research Ltd Elektrofilter
FR2818451B1 (fr) 2000-12-18 2007-04-20 Jean Marie Billiotte Dispositif electrostatique d'emission ionique pour deposer une quantite quasi homogene d'ions sur la surface d'une multitude de particules aerosols au sein d'un fluide en mouvement.
DE102008009258A1 (de) * 2008-02-15 2009-08-20 Brandenburgische Technische Universität Cottbus Vorrichtung und Verfahren zur Aufladung von Aerosolen
DE102009036957A1 (de) * 2009-08-11 2011-02-17 Robert Bosch Gmbh Elektrostatischer Abscheider und Heizungssystem

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