EP3160651A1 - Collecteur électrostatique - Google Patents
Collecteur électrostatiqueInfo
- Publication number
- EP3160651A1 EP3160651A1 EP15731911.2A EP15731911A EP3160651A1 EP 3160651 A1 EP3160651 A1 EP 3160651A1 EP 15731911 A EP15731911 A EP 15731911A EP 3160651 A1 EP3160651 A1 EP 3160651A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- collection
- diameter
- discharge electrode
- electrostatic collector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
-
- 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
- B03C3/12—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
- B03C3/34—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
- B03C3/86—Electrode-carrying means
-
- 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
- B03C2201/06—Ionising electrode being a needle
-
- 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
- B03C2201/08—Ionising electrode being a rod
-
- 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
- B03C2201/28—Parts being designed to be removed for cleaning purposes
Definitions
- the present invention relates to a device for electrostatically collecting particles suspended in a gaseous medium, commonly called electrostatic collector or electrofilter.
- Electrostatic or electrofilter collectors commonly referred to by the acronym ESP (Electrostatic Precipitator) are used to collect particles suspended in a gaseous medium, for example ambient air. They thus make it possible to purify the gaseous medium and possibly to analyze the collected particles.
- ESP Electrostatic Precipitator
- An electrostatic collector comprises two electrodes arranged close to each other.
- One of the two electrodes is commonly referred to as the discharge electrode and the other electrode is commonly referred to as a counter-electrode or a collection electrode.
- a high electric field is induced between the two electrodes under the effect of a potential difference applied between the two electrodes.
- the electric field ionizes the gas volume between the two electrodes, creating a sheath or ring of ionized gas around the discharge electrode. This phenomenon is called corona discharge.
- the gas containing the particles to be separated which is passed between the discharge electrode and the collection electrode then passes through an ion stream and the particles to be separated are ionized in turn. Under the effect of electrostatic forces, Charged particles thus created are attracted to the collection electrode on which they are collected.
- the present invention aims in particular to solve these problems.
- the present invention relates to an electrostatic collector comprising a collection chamber defined by a tubular wall oriented along a first axis; an elongate discharge electrode extending along said first axis; and a collection electrode to be disposed within the collection chamber against the wall.
- the discharge electrode comprises:
- a second portion having a second diameter, the second diameter being greater than or equal to twice the first diameter, the second diameter preferably being between 2 and 6 times the first diameter;
- said abrupt enlargement extends over a distance less than the second diameter.
- the first part may have a length less than about 10 mm, preferably less than about 5 mm, for example between about 1 and 5 mm.
- the electrostatic collector further comprises a first polarization means, capable of carrying the discharge electrode to a first potential, and a second polarization means, suitable for carrying the collection electrode. at a second potential, the first potential being lower than the second potential.
- the first potential is a ground potential.
- the first diameter may be between 0.5 mm and 2 mm.
- the second diameter may be between 1 mm and 5 to 6 mm.
- An advantage of a discharge electrode having such a sudden broadening is related to the fact that it makes it possible to obtain a more axisymmetric deposit of the particles on the collection electrode, with respect to a discharge electrode of constant diameter over its entire length.
- Such a discharge electrode makes it possible to avoid inhomogeneous accumulations of particles collected at the level of the collection electrode. This results in increased collection efficiency of the electrostatic collector.
- the enlargement of the discharge electrode is formed by a conductive ring surrounding the first thin portion of the discharge electrode over a portion of its length, said tip-shaped end protruding of the ring.
- the end of the ring closest to the tip-shaped end of the discharge electrode is rounded.
- Said tip-shaped end may be located at a distance of between 2 mm and 10 mm from the ring.
- the ring may have an outer diameter of between 1 mm and 5 mm and an internal diameter that allows the passage and the maintenance of the first thin portion of the discharge electrode.
- the discharge electrode is a hollow electrical conductive element, for example a metal capillary.
- An advantage of a hollow discharge electrode lies in the fact that it can be manufactured by a method that is simple to implement. Just cut a tube electrical conductor to obtain a hollow discharge electrode. To obtain a tip, the end of the tip-shaped discharge electrode should be machined.
- Another advantage of a hollow discharge electrode lies in the fact that it makes it possible to obtain less intense electric discharges than a tip of comparable dimensions.
- the discharge electrode and the collection electrode are offset relative to one another along said first axis of the collection chamber, no portion of the discharge electrode being at the same level as the collection electrode along said first axis.
- the present invention also relates to an electrostatic collector comprising a collection chamber defined by a tubular wall oriented along a first axis; a discharge electrode, at least one end of which is in the form of a tip, intended to be disposed inside the collection chamber; a collection electrode, of tubular shape, intended to be disposed in an opening formed in the wall, the collection electrode having a first end and a second end, the first end being intended to be closest to said shaped end; peak of the discharge electrode; and biasing means for being disposed in said opening between the collection electrode and the wall.
- An advantage of such an electrostatic collector is related to the fact that it facilitates the removal of the collection electrode from the electrostatic collector, for example for the purpose of analyzing the collected particles and / or cleaning the electrode collection.
- the return means may be a spring.
- the electrostatic collector further comprises a blocking member for pressing the second end of the collection electrode and compressing the biasing means.
- the second end of the collection electrode comprises a flange.
- the first end of the collection electrode has a rounded internal rim. This reduces the risk of generating arcing between the discharge electrode and the collection electrode.
- the inner wall of the collection electrode is a cone portion.
- the collection chamber has a larger internal diameter upstream of the collection electrode than at the location of the collection electrode.
- the present invention also relates to a method of using an electrostatic collector according to the invention, as described above.
- the present invention further relates to a method of using an electrostatic collector comprising:
- a collection chamber delimited by a tubular wall oriented along a first axis
- an elongated discharge electrode extending along said first axis; and a collection electrode disposed within the collection chamber, the discharge electrode having a tip-shaped end disposed facing the collection electrode;
- a first biasing means capable of carrying the discharge electrode at a first potential and a second polarization means capable of bringing the collection electrode to a second potential;
- the method being such that the first potential is lower than the second potential.
- the first potential is a ground potential.
- the present invention further relates to an electrostatic collector comprising:
- a collection chamber delimited by a tubular wall oriented along a first axis
- an elongated discharge electrode extending along said first axis; and a collection electrode disposed within the collection chamber, the discharge electrode having a tip-shaped end disposed facing the collection electrode; and a first polarization means, capable of carrying the discharge electrode at a first potential, and a second polarization means, suitable for bringing the collection electrode to a second potential,
- the electrostatic collector being characterized in that the first potential is lower than the second potential.
- the first potential is a ground potential.
- Figure 1 is a sectional view schematically showing an embodiment of an electrostatic collector.
- Fig. 2 is a sectional view schematically showing an exemplary discharge electrode.
- Fig. 3A is a sectional view schematically showing an example of a collection electrode.
- Figure 3B is a photograph corresponding to Figure 3A.
- Fig. 4 is a sectional view schematically showing a variant of the collection electrode of Fig. 3A.
- Figure 5 is a sectional view schematically showing another embodiment of an electrostatic collector.
- FIG. 6 is a sectional view schematically showing an alternative embodiment of the electrostatic collector of FIG. 5.
- Fig. 7 shows results of measuring the collection efficiency as a function of the particle diameter, for different polarizations of the discharge electrode and the collection electrode.
- FIGS. 8A and 8B show results of measurement of the collection efficiency as a function of the diameter of the particles in the case of a negative discharge, respectively when the discharge electrode is connected to ground and when the collection electrode is connected to ground.
- Fig. 1 is a sectional view schematically showing an embodiment of an electrostatic collector.
- the longitudinal axis of the wall 1 is oriented along the z axis.
- the wall 1 is preferably made of an electrical insulating material.
- the electrostatic collector is intended to be oriented so that the z axis corresponds to the vertical direction or a direction inclined relative to the vertical.
- the wall 1 comprises an upstream end and a downstream end delimiting respectively an inlet 5 and an outlet 7 of the collection chamber.
- upstream, downstream and inlet, “outlet” are considered in relation to the direction of flow of the gas to be treated in the electrostatic collector, symbolized by arrows 9.
- the gas to be treated flows from upstream to downstream, from the inlet 5 to the outlet 7 of the electrostatic collector.
- the device comprises an inlet chamber (not shown) for the admission of the gas to be treated, arranged upstream of the collection chamber 3.
- the intake chamber and the collection chamber are preferably coaxial.
- the discharge electrode 10 is advantageously formed of an element hollow electrical conductor, for example a metal capillary.
- An advantage of a hollow discharge electrode lies in the fact that it can be manufactured by a method that is simple to implement. Simply cut an electrically conductive tube to obtain a hollow discharge electrode. To obtain a tip, the end of the tip-shaped discharge electrode should be machined.
- Another advantage of a hollow discharge electrode lies in the fact that it makes it possible to obtain less intense electric discharges than a tip of comparable dimensions.
- the discharge electrode 10 is preferably arranged along the z-axis of the collection chamber.
- the support 13 for example a ring, whose two ends 14, 16 are fixed to the wall 1, transversely crosses the collection chamber.
- the longitudinal axis of the support 13 is oriented perpendicularly to the longitudinal axis along which extends the tubular wall 1 (z axis).
- the support 13 is preferably made of an insulating material.
- the support 13 comprises a through opening, for example cylindrical, the longitudinal axis of which is parallel to the axis z, configured to receive the discharge electrode 10.
- the longitudinal axis of the discharge electrode 10 is oriented according to the z axis.
- the discharge electrode 10 is in contact with a polarization means 17, comprising at least one electrically conductive part, which makes it possible to connect it electrically to a voltage generator 19.
- Collection electrode 20 is disposed in an opening formed in the wall 1 of the collection chamber.
- the collection electrode 20 and the wall 1 are coaxial.
- the collection electrode 20 is intended to form the collection surface of the particles.
- the internal diameter of the collection electrode 20 is substantially equal to the internal diameter of the wall 1 to reduce the diameter discontinuities of the collection chamber in the path of the gas flow.
- the collection electrode 20 is in contact with a biasing means 21, comprising at least one electrically conductive part, which makes it possible to connect it electrically to the voltage generator 19.
- the support 13 is for example arranged in the collection chamber so that the discharge electrode 10 is located upstream of the collection electrode 20, as shown in FIG. 1.
- the end 10 1 of the discharge electrode 10 closest to the collection electrode 20 corresponds to its downstream end.
- the end 20-1 of the collection electrode 20 closest to the discharge electrode 10 corresponds to its upstream end and the end 20-2 of the collection electrode 20 furthest from the electrode discharge 10 corresponds to its downstream end.
- the discharge electrode 10 and the collection electrode 20 are offset relative to each other along the axis z of the collection chamber, no portion of the discharge electrode 10 being located at the same level as the collection electrode 20 along the z axis.
- the downstream end 10-1 of the discharge electrode 10 and the upstream end 20-1 of the collection electrode 20 are separated by a certain distance (or offset) along the z axis, the downstream end 10-1 of the discharge electrode 10 being located upstream of the upstream end 20-1 of the collection electrode 20.
- the downstream end 10-1 of the discharge electrode 10, the closest to the collection electrode 20, is free.
- This tip is shaped tip, which allows the formation of corona discharges between the discharge electrode (which has the smallest radius of curvature) and the collection electrode (which has the highest radius of curvature) .
- the downstream end 10-1 of the discharge electrode 10 has for example a radius of curvature less than about 1 mm, hence the term "peak shape".
- the distance between the downstream end 10-1 of the discharge electrode 10 and the upstream end 20-1 of the collection electrode 20 is greater than or equal to the internal radius of the collection chamber. This reduces the risk of arcing between the discharge electrode and the collection electrode.
- the distance between the downstream end 10-1 of the discharge electrode and the upstream end 20-1 of the collection electrode is less than three to three. four times the internal radius of the collection chamber. This optimizes the collection yield.
- the free downstream end 10-1 of the discharge electrode, the location of the discharge is offset from the upstream end 20-1 of the collection electrode 20 by a distance, along the z axis , between the internal radius of the collection electrode and the internal diameter of the collection electrode, for example with a tolerance of 1 mm, the downstream end 10-1 of the discharge electrode 10 being located upstream the upstream end 20-1 of the collection electrode 20.
- the offset between the downstream end 10-1 of the discharge electrode 10 and the upstream end 20-1 of the collection electrode 20 according to FIG. Z axis is for example between about 5 mm (for example to +/- 1 mm) and about 10 mm (for example to +/- 1 mm), for example of the order of 7 mm.
- the internal diameter of the collection chamber is less than about 30 mm.
- the discharge electrode 10 has an enlargement upstream of its downstream end 10-1.
- the discharge electrode 10 widens from a first diameter to a second diameter corresponding for example to about 2 to 6 times the first diameter. This enlargement is abrupt, that is to say that it extends over a distance less than the second diameter.
- the discharge electrode 10 comprises:
- a second portion having a second diameter, adjacent to the first portion, the second diameter being greater than or equal to twice the first diameter, the second diameter preferably being between 2 and 6 times the first diameter;
- the first portion and the second portion of the discharge electrode 10 are disposed along the same axis, preferably the z-axis of the collection chamber.
- the tip-shaped downstream end 10-1 of the discharge electrode 10, in the extension of the first part, is free.
- An advantage of such a discharge electrode is related to the fact that it makes it possible to obtain a more axisymmetrical deposition of the particles on the collection electrode, with respect to a discharge electrode of constant diameter over its entire length.
- Such a discharge electrode makes it possible to avoid inhomogeneous accumulations of particles collected at the level of the collection electrode, such accumulations being able to degrade the operation of the device, in particular by reducing the collection efficiency.
- the use of such a discharge electrode makes it possible to reduce the amplitude variations of the corona discharges. This results in a reduction of the variations in the collection efficiency of the electrostatic collector as and when it is used.
- the first diameter may be between 0.5 and 2 mm, preferably between 0.5 and 1 mm.
- the discharge electrode 10 widens for example at a distance greater than or equal to 1 mm from its downstream end 10-1, for example at a distance of about 5 mm from its downstream end 10-1.
- the broadening of the discharge electrode 10 may be formed by a conductive ring surrounding the thin portion of the discharge electrode over part of its length.
- the downstream end of at least the thin portion of the discharge electrode protrudes from the ring.
- the discharge electrode 10 comprises a cylindrical ring disposed at a distance of the order of 1 to 10 mm from the downstream end 10-1, this ring extending along the same axis as the discharge electrode.
- the inner diameter of the ring corresponds to the first diameter
- its outer diameter corresponds to the second diameter.
- the ring may have an outer diameter of between 1 mm and 5 mm and an internal diameter that allows the passage and the maintenance of the thin portion of the discharge electrode 10.
- the thin portion of the discharge electrode 10 may protrude from the ring by a distance of between 1 mm and 10 mm downstream of the ring.
- the portion of the discharge electrode between the enlargement 11 and the downstream end 10-1 corresponds to the thin portion of the electrode. Its diameter is less than about 2 mm, preferably less than about 1 mm.
- the thin portion of the discharge electrode 10 is for example formed of a hollow electrical conductive element, for example a metal capillary.
- the metal capillary has for example an outer diameter of the order of 0.5 mm and an internal diameter of about 0.25 mm.
- the thin portion of the discharge electrode 10 is formed of a solid electrical conductor element.
- FIG. 2 is a sectional view schematically showing an example of such a discharge electrode that can be used in an electrostatic collector of the type illustrated in FIG. 1.
- This discharge electrode is formed of a metal capillary 10a surrounded by over part of its length by a metal ring 10b.
- the capillary 10a and the ring 10b are for example interconnected by a weld.
- the end 10c of the ring 10b, through which protrudes and passes the downstream end 10-1 of the discharge electrode 10, intended to be the closest to the collection electrode, is rounded. This avoids any peak effect. This rounding can be formed by a weld.
- the discharge electrode 10 is formed of a metal capillary 10a of external diameter of the order of 0.5 mm and internal diameter of the order of 0.25 mm, surrounded on a part its length by a metal ring 10b of outer diameter of the order of 2 mm and internal diameter of the order of 0.5 mm.
- the capillary 10a opens out of the ring 10b for example at about 5 mm from the downstream end 10-1 of the discharge electrode 10.
- the discharge electrode 10 may be formed in one piece, machined to have a thin end, i.e., less than about 2 mm in diameter, preferably less than about 1 mm in diameter. , and an enlargement as previously described.
- the thin portion 10a of the discharge electrode is preferably made of a metallic material, for example steel or stainless steel or copper or silver.
- the conductive ring 10b is preferably made of a metallic material, for example steel or stainless steel or copper or silver.
- the collection electrode 20 preferably has no protrusion or no roughness or no sharp angle facing the discharge electrode.
- the collection electrode 20 has a smooth surface to the touch, that is to say that the surface of the collection electrode has a roughness parameter Ra less than about 0.7 ⁇ , preferably less than about 0, 4 ⁇ .
- the collection electrode 20 has a perfectly polished surface, that is to say that the surface of the collection electrode has a roughness parameter Ra less than about 0.2 ⁇ .
- the collection electrode 20 is made of a metallic material, for example aluminum.
- the collection electrode 20 is made of a conductive material other than a metallic material, for example stainless steel or at least one conductive polymer.
- Fig. 3A is a sectional view schematically showing an example of a collection electrode for use in an electrostatic collector of the type shown in Fig. 1.
- Fig. 3B is a photograph corresponding to Fig. 3A.
- the collection electrode 20 comprises a main portion 20b of cylindrical shape.
- 20-3 denotes the inner wall of the collection electrode 20, intended to form the collection surface of the particles, and by reference 20-4 the outer wall of the collection electrode 20.
- the outer wall 20-4 and the inner wall 20-3 of the collection electrode 20 are cylindrical.
- the upstream end 20-1 of the collection electrode 20, intended to be the closest to the discharge electrode 10, has a rounded internal edge 20a.
- the collection electrode 20 does not present a sharp angle opposite the discharge electrode 10. This reduces the risk of generating arcs. between the discharge electrode 10 and the collection electrode 20.
- the downstream end 20-2 of the collection electrode 20, intended to be the furthest away from the discharge electrode 10, comprises an outer flange 20c in the form of a flange.
- Fig. 4 is a sectional view schematically showing a variant of the collection electrode of Fig. 3A.
- the elements common with those of Figure 3A are designated by the same references.
- the internal diameter of the collection electrode is not constant.
- the inner wall 20-3 of the collection electrode 20 widens from the upstream end 20-1 to the downstream end 20-2, and the outer wall 20-4 is cylindrical.
- the inner wall 20-3 of the collection electrode 20 corresponds for example to a cone portion.
- the angle of inclination ⁇ of the inner wall 20-3 with respect to the axis of revolution of the collection electrode 20 is for example between about 1 ° and about 10 °.
- Fig. 5 is a sectional view schematically showing another embodiment of an electrostatic collector.
- the elements common with those of Figure 1 are designated by the same references and are not described again below.
- the collection electrode 20 is removable, able to be inserted into the electrostatic collector and to be removed manually. It can then be inserted in an analysis device and / or in a cleaning device outside the electrostatic collector.
- An opening 42 formed in the wall 1 of the collection chamber, is configured to receive the collection electrode 20 and a return means 40, for example a spring, positioned in the opening 42 between the collection electrode 20 and the wall 1.
- the internal diameter of the collection electrode 20 corresponds substantially to the internal diameter of the wall 1.
- the opening 42 is made such that no part of the return means 40 is closer to the discharge electrode 10 than the collection electrode 20.
- the downstream end 20-2 of the removable collection electrode 20 comprises a flange 20c forming a bearing surface for the return means 40.
- a locking piece 44 is intended to be positioned against the flange 20c in order to block it resting against the return means 40.
- the return means 40 is preferably an electrically conductive material, for example stainless steel. In this case, the return means 40 is intended to be electrically connected to the biasing means 21 in order to bias the collection electrode 20.
- the locking piece 44 is positioned against the flange 20c of the collection electrode 20.
- the locking piece 44 blocks the flange 20c resting against the return means 40, which compresses the latter.
- the return means 40 is supported both on the wall 1 of the collection chamber and on the collection electrode 20.
- the blocking piece 44 is removed.
- the biasing means 40 then pushes the collection electrode 20 out of the opening 42, which facilitates removal of the collection electrode from the electrostatic collector.
- An advantage of an electrostatic collector of the type described in connection with FIG. 5 is related to the fact that it facilitates the removal of the collection electrode from the electrostatic collector, for example with a view to analyzing the particles. collected and / or cleaning the collection electrode.
- Figure 6 is a sectional view schematically showing an alternative embodiment of the electrostatic collector of Figure 5.
- the elements common with those of Figure 5 are designated by the same references and are not described again below.
- the collection chamber 3 has a larger internal diameter upstream of the collection electrode 20 than at the location of the collection electrode. This results in a decrease in the pressure drop of the device.
- the reduction factor of the diameter of the collection chamber 3 from upstream to downstream is for example of the order of 30 to 50%.
- the diameter restriction is preferably formed near the downstream end 10-1 of the discharge electrode 10, upstream of the downstream end 10-1, for example at a distance corresponding substantially to the internal diameter of the collection electrode.
- the wall 1 of the collection chamber has an internal diameter substantially equal to the internal diameter of the collection electrode 20.
- a discharge electrode of the type illustrated in FIG. 2 may of course be used in an electrostatic collector of the type illustrated in FIGS. 5 and 6.
- a collection electrode of the type illustrated in FIG. 4 may be used. in an electrostatic collector of the type illustrated in FIGS. 5 and 6.
- the voltage generator is able to impose an electrical potential difference between the collection electrode and the discharge electrode between about 1 kV and about 15 kV, preferably between about 6 kV and about 10 kV.
- the discharge electrode and the collection electrode are polarized so that the electric potential of the discharge electrode is lower than the electrical potential of the collection electrode. It is said that the electric discharge is negative.
- the discharge electrode 10 is connected to ground and the potential of the collection electrode 20 is positive.
- the inventors have carried out collection efficiency measurements as a function of particle diameter. These measures enabled them to regardless of the diameter of the particles considered, the collection efficiency is optimized for a negative discharge and for a discharge electrode connected to ground.
- the inventors passed ambient air containing natural dust into the collection chamber 3.
- the treated air was taken from a bypass disposed in downstream of the collection electrode 20.
- a Grimm Dust Monitor vl.109 type optical particle counter was then used to analyze the air sampled. This made it possible to determine the concentration of the particles in the air taken according to their diameter and to deduce the collection efficiency as a function of the particle diameter.
- the measurements were made with a collection chamber of internal diameter of the order of 10 mm, and for a distance of about 6 mm between the discharge electrode 10 and the collection electrode 20.
- Fig. 7 shows results of measuring the collection efficiency as a function of the particle diameter, for different polarizations of the discharge electrode and the collection electrode and for an air flow of 5 liters per minute.
- the curves 61 and 62 correspond to a positive discharge, the potential of the discharge electrode being respectively 9 kV and 9.9 kV, the collection electrode being connected to ground.
- the curves 63 and 64 correspond to a negative discharge, the potential of the collection electrode being respectively 9 kV and 9.9 kV, the discharge electrode being connected to ground.
- FIGS. 8A and 8B show results of measuring the collection efficiency as a function of the particle diameter in the case of a negative discharge, respectively when the discharge electrode is connected to ground and when the collection electrode is connected to the mass. Measurements were made for a negative discharge of 9.9 kV.
- the curves 71 and 81 respectively correspond to the case where the discharge electrode is connected to ground and in the case where the collection electrode is connected to the mass.
- the curves 73 and 83 respectively correspond to the case where the discharge electrode is connected to the earth and in the case where the collection electrode is connected to the ground (in case the mass is connected to the earth).
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- Electrostatic Separation (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1455908A FR3022806B1 (fr) | 2014-06-25 | 2014-06-25 | Collecteur electrostatique |
PCT/EP2015/064344 WO2015197747A1 (fr) | 2014-06-25 | 2015-06-25 | Collecteur electrostatique |
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EP3160651A1 true EP3160651A1 (fr) | 2017-05-03 |
EP3160651B1 EP3160651B1 (fr) | 2022-08-31 |
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EP15731911.2A Active EP3160651B1 (fr) | 2014-06-25 | 2015-06-25 | Collecteur électrostatique |
Country Status (4)
Country | Link |
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US (1) | US10384214B2 (fr) |
EP (1) | EP3160651B1 (fr) |
FR (1) | FR3022806B1 (fr) |
WO (1) | WO2015197747A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3093564B1 (fr) * | 2015-05-12 | 2018-09-19 | Blueair AB | Dispositif de nettoyage de l'air |
KR101669391B1 (ko) * | 2016-02-04 | 2016-10-25 | 주식회사 엔아이티코리아 | 전기 집진필터 제조방법 및 그 방법에 의해 제조된 전기 집진필터 |
FR3080782B1 (fr) * | 2018-05-04 | 2020-11-06 | Bertin Technologies Sa | Collecteur electrostatique de particules |
FR3080781B1 (fr) * | 2018-05-04 | 2021-01-01 | Bertin Technologies Sa | Systeme de collecte electrostatique de particules ou de micro-organismes |
FR3117898A1 (fr) | 2020-12-21 | 2022-06-24 | Commissariat à l'Energie Atomique et aux Energies Alternatives | Unité de collecte de particules aéroportées |
FR3130649A1 (fr) | 2021-12-17 | 2023-06-23 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Membrane de collecte de particules aéroportées |
FR3130650B1 (fr) | 2021-12-17 | 2023-11-03 | Commissariat Energie Atomique | Procédé et dispositif de récupération et d'analyse de particules aéroportées. |
FR3142918A1 (fr) | 2022-12-13 | 2024-06-14 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Membrane de collecte de particules aéroportées, à surface fonctionnalisée |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR25527E (fr) * | 1921-05-10 | 1923-03-19 | Purification Ind Des Gaz Soc D | Perfectionnement aux appareils de dépoussiération électrique des gaz et des vapeurs |
GB413800A (en) * | 1933-03-03 | 1934-07-26 | Sturtevant Eng Co Ltd | Improvements in electrostatic precipitating plant |
US2199390A (en) * | 1937-11-23 | 1940-05-07 | Int Precipitation Co | Electrical precipitation |
US2244279A (en) * | 1940-03-01 | 1941-06-03 | Research Corp | Electrode for electric precipitators |
FR944547A (fr) * | 1947-03-20 | 1949-04-07 | Cfcmug | Perfectionnement aux appareils de purification des gaz par précipitation électrique |
FR976521A (fr) * | 1947-12-16 | 1951-03-19 | Sturtevant Eng Co Ltd | Séparateur de poussières par précipitation électrostatique |
US3400513A (en) * | 1966-09-08 | 1968-09-10 | Babcock & Wilcox Co | Electrostatic precipitator |
DE1557150A1 (de) * | 1966-12-03 | 1970-04-02 | Metallgesellschaft Ag | Elektrostatischer Staubabscheider |
US3495379A (en) * | 1967-07-28 | 1970-02-17 | Cottrell Res Inc | Discharge electrode configuration |
DE3234200A1 (de) * | 1981-09-19 | 1983-03-31 | Franz Staad Braun | Elektrofilter mit doppelelektrode |
US4533368A (en) * | 1982-09-30 | 1985-08-06 | Black & Decker, Inc. | Apparatus for removing respirable aerosols from air |
US5395430A (en) * | 1993-02-11 | 1995-03-07 | Wet Electrostatic Technology, Inc. | Electrostatic precipitator assembly |
DE102009030803A1 (de) * | 2009-06-27 | 2011-01-05 | Karlsruher Institut für Technologie | Elektrostatischer Abscheider zur Rauchgasreinigung mit einem elektrischen Sperrfeld |
CH702246A1 (de) * | 2009-11-18 | 2011-05-31 | Beat Mueller | Elektrostatische Feinstaubfilteranlage, Halterung für eine Elektrode und Elektrode dafür. |
FR3010642B1 (fr) * | 2013-09-13 | 2015-10-09 | Commissariat Energie Atomique | Collecteur electrostatique |
-
2014
- 2014-06-25 FR FR1455908A patent/FR3022806B1/fr active Active
-
2015
- 2015-06-25 US US15/321,589 patent/US10384214B2/en active Active
- 2015-06-25 WO PCT/EP2015/064344 patent/WO2015197747A1/fr active Application Filing
- 2015-06-25 EP EP15731911.2A patent/EP3160651B1/fr active Active
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2015197747A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR3022806B1 (fr) | 2019-06-21 |
US20170203304A1 (en) | 2017-07-20 |
US10384214B2 (en) | 2019-08-20 |
EP3160651B1 (fr) | 2022-08-31 |
WO2015197747A1 (fr) | 2015-12-30 |
FR3022806A1 (fr) | 2016-01-01 |
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