WO2020085231A1 - Dispositif d'élimination de poussière - Google Patents

Dispositif d'élimination de poussière Download PDF

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Publication number
WO2020085231A1
WO2020085231A1 PCT/JP2019/041053 JP2019041053W WO2020085231A1 WO 2020085231 A1 WO2020085231 A1 WO 2020085231A1 JP 2019041053 W JP2019041053 W JP 2019041053W WO 2020085231 A1 WO2020085231 A1 WO 2020085231A1
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WO
WIPO (PCT)
Prior art keywords
nozzle
counter electrode
blower
droplet
air
Prior art date
Application number
PCT/JP2019/041053
Other languages
English (en)
Japanese (ja)
Inventor
上田　泰稔
怜 竹井
長安　弘貢
正志 清澤
亮太 文
晴治 香川
一明 三宅
Original Assignee
三菱日立パワーシステムズ株式会社
三菱日立パワーシステムズ環境ソリューション株式会社
Priority date (The priority date 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 date listed.)
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Application filed by 三菱日立パワーシステムズ株式会社, 三菱日立パワーシステムズ環境ソリューション株式会社 filed Critical 三菱日立パワーシステムズ株式会社
Publication of WO2020085231A1 publication Critical patent/WO2020085231A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/003—Ventilation in combination with air cleaning
    • 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
    • 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
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • 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
    • B03C3/70—Applications of electricity supply techniques insulating in electric separators
    • 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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F6/00—Air-humidification, e.g. cooling by humidification
    • F24F6/12—Air-humidification, e.g. cooling by humidification by forming water dispersions in the air
    • F24F6/14—Air-humidification, e.g. cooling by humidification by forming water dispersions in the air using nozzles

Definitions

  • the present disclosure relates to a dust removing device.
  • At least one embodiment of the present invention aims to provide a dust remover capable of removing fine particles floating in the air in a relatively wide space.
  • a dust removing device At least one nozzle, which is arranged at the blowout part of the blown air, is capable of ejecting the supplied liquid as droplets, and is connected to the ground;
  • the counter electrode includes a counter electrode having a shape surrounding at least a half circumference of one opening, and one counter electrode is provided for one of the nozzles, and the counter electrode is arranged in a direction in which the nozzle ejects a droplet.
  • a high voltage generator for applying a high voltage to the counter electrode which has a ground terminal connected to the ground and connected to an output terminal, Equipped with The current flowing between the nozzle and the ground is, when a leakage current does not flow between the nozzle and the counter electrode, per injection amount of the droplet of 1 liter / min and the opening area of the blowing portion. It is less than 0.3 milliamps / (square meter liter / minute) per square meter.
  • the amount is less than 0.3 mA / (square meter liter / minute) per 1 liter / minute and per 1 square meter opening area of the air outlet, it is effective for the fine particles in the atmosphere in the above-mentioned relatively wide space and outdoors.
  • the droplets can be charged so that they can be selectively collected.
  • the nozzle is configured to eject the droplet in a conical shape
  • the first distance from the jetting position of the droplet in the nozzle to the intersection of the plane including the counter electrode and the center line of the cone is r (millimeter)
  • the intersection is
  • the second distance that is the minimum distance between the counter electrode and the counter electrode is a 0 (millimeter)
  • the ejection angle at which the nozzle ejects the droplet is ⁇ (degrees)
  • the droplets ejected in a conical shape from the nozzle pass through the region inside the counter electrode in the opening surrounded by the counter electrode. Can be made. As a result, it is possible to prevent the counter electrode from getting wet with droplets, and it is possible to suppress the flow of leakage current between the nozzle and the counter electrode.
  • the first distance is 5 mm or more and 200 mm or less
  • the second distance is 5 mm or more and 50 mm or less.
  • the high voltage applied to the counter electrode forms the droplet at the nozzle ejection position, that is, at the nozzle tip.
  • the strength of the applied electric field can be sufficiently increased.
  • the ejection angle of the nozzle is 30 degrees or more and 100 degrees or less.
  • the configuration of (4) by setting the ejection angle of the nozzle to 30 degrees or more and 100 degrees or less, wetting of the counter electrode with droplets can be suppressed, and the electric field strength required for charging the droplets can be reduced. Can be secured.
  • the at least one nozzle has a droplet diameter of 10 ⁇ m or more and 300 ⁇ m or less in terms of Sauter average diameter.
  • the droplets can be ejected.
  • a blower for blowing the air containing the droplets In some embodiments, in any of the configurations of (1) to (5) above, And a blower for blowing the air containing the droplets, The nozzle and the electrode unit are attached to the housing of the blower.
  • the air blown from the blower can diffuse the droplets into a relatively wide space, so that dust can be removed in a relatively wide space.
  • the nozzle and the electrode portion are installed at positions where the droplets can be effectively diffused by the air blown from the blower. It becomes easy to do.
  • a support portion configured by an insulating material and supporting the electrode portion, A scavenging nozzle configured to inject a gas toward the support portion, Is further provided.
  • the high-voltage current applied to the counter electrode may flow as a leakage current to the ground side via the supporting part wet with the droplet.
  • the configuration of (7) above by injecting gas from the scavenging nozzle toward the support portion, it is possible to suppress liquid droplets from adhering to the support portion and suppress the generation of leakage current. .
  • It further comprises a support portion configured to be formed of a water-repellent insulating material, or formed of an insulating material and having a surface subjected to a water-repellent treatment, for supporting the electrode portion.
  • the high-voltage current applied to the counter electrode may flow as a leakage current to the ground side through the supporting part wet with the liquid droplets.
  • the water repellency can prevent the droplet from adhering to the supporting portion.
  • the droplet contacts the supporting portion it is possible to prevent the entire surface of the supporting portion from getting wet with the liquid. Thereby, the generation of leakage current can be suppressed.
  • the droplets can be uniformly applied to the flow of air blown from the blower by ejecting the droplets from the plurality of nozzles.
  • An air blower for blowing air containing the droplets the blower having the blowing portion;
  • a direction changing device configured to change the blowing direction of air from the blower, Is further provided.
  • An air blower for blowing air containing the droplets the blower having the blowing portion;
  • a direction changing device configured to change the blowing direction of air from the blower, Further equipped with,
  • the direction changing device is configured to be able to set the air blowing direction so that the air can be blown at least above the horizontal direction.
  • the direction changing device in the configuration of (10) or (11), is capable of setting the air blowing direction so that air can be blown upward at an elevation angle of 0 degrees or more. Has been done.
  • the direction changing device sets an ejection direction of the droplet from the at least one nozzle to an air from the blower. It is configured to be changeable in the same direction as the air blowing direction of.
  • the jetting direction of the droplets from the nozzle can be changed to the same blowing direction of the air from the blower, the droplets can be efficiently applied to the flow of air blown from the blower. it can.
  • expressions such as “identical”, “equal”, and “homogeneous” that indicate that they are in the same state are not limited to strict equality, but also include tolerances or differences in the degree to which the same function is obtained. It also represents the existing state.
  • the representation of a shape such as a quadrangle or a cylindrical shape does not only represent a shape such as a quadrangle or a cylindrical shape in a geometrically strict sense, but also an uneven portion or a chamfer within a range in which the same effect can be obtained.
  • the shape including parts and the like is also shown.
  • the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one element are not exclusive expressions excluding the existence of other elements.
  • FIG. 1 is a perspective view schematically showing the appearance of a dust remover according to some embodiments.
  • FIG. 2 is a view of a dust removing device according to some embodiments as seen from a downstream side in a blowing direction of a blower described later, and shows a main part.
  • FIG. 3 is a side view of the dust remover according to some embodiments, and schematically shows the configuration of the main part.
  • the dust remover 1 includes a blower 10, a nozzle 20, an electrode unit 30, and a high voltage generator 40.
  • a blower 10 is a blower for blowing air including droplets 2 (see FIG. 3) ejected by a nozzle 20 described later.
  • the blower 10 according to some embodiments includes an impeller 12 that is rotated by a driving force of a motor (not shown) inside a casing 11 having a cylindrical shape, for example, and the cylindrical casing 11 is rotated by the rotation of the impeller 12. Air is sucked in from one end and blown in from the left side to the right side in the drawing as shown by an arrow C in FIG. 3, and is discharged from the blowing section 13 at the other end.
  • the nozzle 20 is a nozzle capable of ejecting the liquid supplied from the supply pump 29 as droplets, and is generally also called a spray nozzle.
  • the liquid supplied to the nozzle 20 is water, for example.
  • the nozzle 20 is attached to the supply pipe 22 and arranged in the blowout air blower 13. More specifically, the nozzle 20 is arranged at a position separated from the blowout portion 13 at the other end of the housing 11 of the blower 10 on the downstream side in the blowing direction.
  • the supply pipe 22 is attached to the housing 11 of the blower 10 by the pipe attachment portion 24.
  • multiple nozzles 20 are provided. In the example shown in FIGS. 1 and 2, eight nozzles 20 are provided, but the number of nozzles 20 may be one or more.
  • the nozzle 20 ejects droplets toward the downstream side of the blower 10 in the blowing direction.
  • the nozzle 20 is configured to eject the droplet 2 in a conical shape.
  • the nozzle 20 according to some embodiments is configured to be capable of ejecting a droplet having a droplet diameter of 10 ( ⁇ m) or more and 300 ( ⁇ m) or less in average Sauter diameter.
  • the ejection angle ⁇ of the nozzle 20 according to some embodiments is 30 degrees or more and 100 degrees or less. The droplet diameter and the spray angle ⁇ will be described in detail later.
  • the nozzle 20 is connected to the ground 9. Specifically, the nozzle 20 according to some embodiments is connected to the ground 9 via the supply pipe 22, for example, by connecting the supply pipe 22 to the ground 9.
  • the nozzle 20 and the supply pipe 22 are formed of a conductive member such as metal.
  • the electrode unit 30 includes a plurality of counter electrodes 31 and an electrode support member 35 that supports the plurality of counter electrodes.
  • Each of the counter electrodes 31 according to some embodiments has a shape surrounding the periphery of the opening 33.
  • Each of the counter electrodes 31 according to some embodiments has, for example, an annular shape.
  • Each of the counter electrodes 31 may have, for example, an elliptical ring shape, or may have a polygonal shape such as a rectangular shape surrounding the periphery of the opening 33.
  • the counter electrodes 31 may have the same size or different sizes.
  • the counter electrodes 31 may have the same shape or different shapes. Further, each of the counter electrodes 31 does not necessarily have to have a closed shape, and may have, for example, a shape that surrounds the periphery of the opening 33 for at least a half circumference or more.
  • one counter electrode is provided for one nozzle 20.
  • a plurality of counter electrodes 31 are supported by an electrode support member 35.
  • the counter electrode 31 is arranged apart from the nozzle 20 in the direction in which the nozzle 20 ejects droplets, and is supported by the support unit 51 made of an insulating material. Specifically, one end of the columnar support portion 51 is fixed to the mounting portion 15 provided at the other end of the casing 11 of the blower 10, and the electrode support member 35 of the electrode portion 30 is fixed to the other end of the support portion 51. Has been done.
  • the high voltage generator 40 is a device capable of generating a high voltage of, for example, 1 kilovolt or more.
  • the ground terminal 42 is connected to the ground 9, and a high voltage can be applied to the counter electrode 31 (electrode portion 30) connected to the output terminal 41.
  • the blower 10 is supported by the blower support portion 61 so as to be able to rise and fall, as indicated by an arrow A in FIG. 1.
  • the blower 10 is rotatable about the central axis CL by the turning device 65 as shown by an arrow B in FIG. 1. That is, the blower 10 can rotate in a plane parallel to the mounting surface of the turning device 65, such as the floor.
  • the direction changing device 60 configured to change the blowing direction of the air from the blower includes the blower support portion 61 and the turning device 65.
  • the liquid (water) supplied from the supply pump 29 can be sprayed as droplets by the plurality of nozzles 20. Then, in the dust removing device 1 according to some embodiments, by applying the high voltage generated by the high voltage generating device 40 to the counter electrode 31, the droplet 2 sprayed from the nozzle 20 is applied to the counter electrode 31. It can be charged to the opposite polarity of the applied voltage. Further, in the dust removing device 1 according to some embodiments, it is possible to diffuse the charged droplets 2 to the surroundings by blowing air from the blower 10 in a relatively large space such as a gymnasium or an indoor stadium or outdoors. it can. The charged droplets 2 can collect fine powder in the air by electrostatic force. The fine powder collected in the droplet 2 falls on the ground together with the droplet 2. Thus, for example, in a relatively large space such as a gymnasium or an indoor arena, or outdoors, fine particles in the atmosphere can be efficiently collected and removed by the charged droplets 2.
  • FIG. 4 is a schematic diagram for explaining the mechanism of charging the droplet 2.
  • a high voltage from the high voltage generator 40 is applied to the counter electrode 31, the liquid ejected from the nozzle 20 is generated by the electric field formed by the potential difference between the counter electrode 31 and the nozzle 20 connected to the ground 9.
  • the drop 2 is dielectrically polarized.
  • a negative high voltage is applied to the counter electrode 31 from the high voltage generator 40, in the droplet 2 immediately before being ejected from the nozzle 20, a region near the counter electrode 31 is positively charged, and the counter electrode 31 is charged. Areas far from 31 are negatively charged.
  • the polarization charge induced in the region far from the counter electrode 31 flows to the ground (ground 9) through the conductive nozzle 20 and the supply pipe 22. As a result, the droplet 2 ejected from the nozzle 20 is positively charged.
  • the dust remover 1 it is possible to charge the droplet 2 sprayed from the nozzle 20 to a polarity opposite to the polarity of the voltage applied to the counter electrode 31 by dielectric polarization. it can.
  • the dust remover 1 since the dust remover 1 according to some embodiments includes the nozzle 20, the electrode unit 30, and the high-voltage generator 40, a relatively large amount of the droplet 2 generated by the nozzle 20 is subjected to dielectric polarization. Can be charged by. In the dust remover 1 according to some embodiments, it is not necessary to apply a current to the counter electrode 31 to charge the droplet 2 because of the principle of charging the droplet 2 by dielectric polarization. Therefore, in the dust remover 1 according to some embodiments, the total value of the currents flowing from the high voltage generator 40 to all the counter electrodes 31 is the same as when the leakage current does not flow between the nozzle 20 and the counter electrode 31. In addition, it is possible to suppress it to less than 0.1 (mA), for example.
  • mA 0.1
  • the high voltage generator 40 having a relatively low output power causes a relatively large amount of liquid with an effective charge amount for collecting fine particles in the atmosphere.
  • the drop 2 can be charged.
  • the particles 2 in the atmosphere can be efficiently collected and removed by the charged droplets 2 in a relatively large space such as a gymnasium or an indoor stadium or outdoors.
  • the dust remover 1 since it is not necessary to pass a current through the counter electrode 31 to charge the droplet 2, the high-voltage high-voltage generator 40 has a large output. It is unnecessary, and the cost of the high voltage generator 40 can be suppressed.
  • the dust removers 1 in principle, it is not necessary to apply a current to the counter electrode 31 to charge the droplet 2. Therefore, by ensuring the insulation of the counter electrode 31 (electrode portion 30) so that the leakage current does not flow between the nozzle 20 and the counter electrode 31, almost all the current flowing from the high voltage generator 40 to the counter electrode 31 is generated. You can choose not to. Thereby, the rated output of the high voltage generator 40 can be reduced, and the cost of the high voltage generator 40 can be further suppressed.
  • FIG. 5 is a diagram for explaining the positional relationship between the nozzle 20 and the counter electrode 31.
  • the positional relationship between the nozzle 20 and the counter electrode 31 will be described.
  • the nozzle 20 is configured to eject the droplet 2 in a conical shape. Therefore, in order to prevent the liquid droplets 2 ejected from the nozzle 20 from directly contacting the counter electrode 31, in the dust removers 1 according to some embodiments, the positional relationship between the nozzle 20 and the counter electrode 31 is as follows. The formula (1) described in (3) is satisfied.
  • the second distance L2, which is the minimum distance between the counter electrode 31 and the counter electrode 31, is a 0 (millimeter)
  • the ejection angle at which the nozzle 20 ejects the droplet 2 is ⁇ (degrees).
  • the relationship is expressed by the following equation (1). r ⁇ a 0 / tan ( ⁇ / 2) (1)
  • the droplet 2 that is conically ejected from the nozzle 20 can pass through the region inside the counter electrode 31 in the opening 33 surrounded by the counter electrode 31.
  • the counter electrode 31 it is possible to prevent the counter electrode 31 from getting wet with the liquid droplet 2, and it is possible to prevent a leakage current from flowing between the nozzle 20 and the counter electrode 31.
  • the ejection angle of the nozzle 20 is preferably 30 degrees or more and 100 degrees or less, as described above. That is, when the spray angle is large, the counter electrode 31 is likely to be wet with the droplet 2. Therefore, current leakage is likely to occur, and it becomes difficult to secure the electric field strength necessary for charging the droplets. Therefore, by setting the ejection angle of the nozzle 20 to 30 degrees or more and 100 degrees or less, it is possible to prevent the counter electrode 31 from getting wet with the droplet 2 and to secure the electric field strength necessary for charging the droplet.
  • the second distance L2 which is the minimum distance between the intersection C1 and the counter electrode 31, is 5 (mm). It is better to be 50 (mm) or less.
  • the first distance L1 from the tip 20a of the nozzle 20 to the intersection C1 is preferably 5 (mm) or more and 200 (mm) or less.
  • the second distance L2 is the inner radius of the counter electrode 31.
  • FIG. 6 is a diagram for further explaining the first distance L1.
  • the electric field strength formed at the tip 20a of the nozzle 20 is generally expressed by the following equation (2), and when the inner radius and the outer radius of the counter electrode 31 are determined, the electric field strength becomes a maximum value.
  • the distance (first distance L1) is determined.
  • E ⁇ r / (a ⁇ a 0 ) ⁇ ⁇ 1 / (a 2 + r 2 ) 0.5 ⁇ 1 / (a 0 2 + r 2 ) 0.5 ⁇ ⁇ V 0
  • a is the outer radius L3 (m) of the counter electrode 31
  • a 0 is the inner radius L2 (m) of the counter electrode 31 as described above.
  • r is the first distance L1 (m) from the tip 20a of the nozzle 20 to the intersection C1 as described above.
  • V 0 is a voltage (V) applied to the counter electrode.
  • E is the electric field intensity (V / m) at the tip 20a of the nozzle 20.
  • the applied voltage V 0 is preferably 5 (kV) or more and 80 (kV) or less.
  • the droplet ejection position in the nozzle 20 by the high voltage applied to the counter electrode 31 That is, the strength of the electric field formed at the tip 20a of the nozzle 20 can be sufficiently increased. If the first distance L1 does not fall within the above range due to, for example, the insulating structure of the electrode portion 30, the inner radius and the outer radius of the counter electrode 31 are adjusted so that the electric field strength E becomes equal to the first distance. It is good to make it maximum with respect to L1.
  • the nozzle 20 is configured to be capable of ejecting a liquid droplet having a Sauter mean diameter of 10 ( ⁇ m) or more and 300 ( ⁇ m) or less.
  • a Sauter mean diameter 10 ( ⁇ m) or more and 300 ( ⁇ m) or less.
  • the fine particles in the atmosphere are droplets. Can be effectively collected.
  • the dust remover 1 since the dust remover 1 according to some embodiments includes the blower 10, the droplets 2 can be diffused into a relatively wide space by the air blown from the blower 10, so that the dust in the relatively wide space is removed. It can be performed. Further, in the dust remover 1 according to some embodiments, since the nozzle 20 and the electrode unit 30 are attached to the housing 11 of the blower 10, it is possible to effectively diffuse the droplets 2 by blowing air from the blower 10. It becomes easy to install the nozzle 20 and the electrode part 30 at a position where the above can be achieved.
  • FIG. 7 is a view of a dust removing device according to another embodiment as viewed from the downstream side of the blower in the blowing direction, and shows the main part.
  • a scavenging nozzle 71 is further provided in addition to the dust removers 1 according to some of the above-described embodiments.
  • the scavenging nozzle 71 is a nozzle configured to be able to inject gas toward the support portion 51 that supports the electrode portion 30.
  • the scavenging nozzle 71 is arranged on the outer side in the radial direction of the housing 11 with respect to the support portion 51, and as shown by an arrow b, the housing is shown.
  • Gas can be ejected from the outside of the body 11 in the radial direction toward the inside.
  • two scavenging nozzles 71 are arranged for one support portion 51, but if at least one scavenging nozzle 71 is arranged. Good.
  • the high-voltage current applied to the counter electrode 31 is leaked to the ground side via the support portion 51 wet with the droplet 2 and the housing 11 of the blower 10. It may flow.
  • the droplet 2 is attached to the support portion 51 by injecting gas from the scavenging nozzle 71 toward the support portion 51. It is possible to suppress the occurrence of leakage current.
  • the scavenging nozzle 71 may be provided for all of the supporting portions 51, or may be provided only for the supporting portion 51 that is easily wetted in the most frequently used postures among the postures of the blower 10. Good.
  • the support portion 51 is made of a water-repellent insulating material, or is made of an insulating material and the surface thereof is subjected to a water-repellent treatment. It is good to have Accordingly, even if the droplet 2 comes into contact with the support portion 51, it is possible to suppress the droplet 2 from adhering to the support portion 51 due to its water repellency. Further, even if the droplet 2 comes into contact with the support portion 51, it is possible to prevent the entire surface of the support portion 51 from getting wet with the liquid. Thereby, the generation of leakage current can be suppressed.
  • a plurality of nozzles 20 are provided on the downstream side of the blower with respect to the flow of air blown by the blower 10. Accordingly, by ejecting the droplets 2 from the plurality of nozzles 20, the droplets 2 can be uniformly applied to the flow of air blown from the blower 10.
  • the flow velocity of the blown air blown out from the blowout portion 13 of the blower 10 is preferably 5 (m / sec) or more.
  • the flow velocity of the blown air blown out from the blowing portion 13 is equal to that of the liquid ejected from the nozzle 20.
  • the ejection speed of the droplet 2 is preferably 0.5 times or more.
  • the dust remover 1 includes a direction changing device 60 configured to change the blowing direction of air from the blower. Therefore, by changing the blowing direction of the air from the blower 10 by the direction changing device 60, it is possible to easily change the direction in which the droplets 2 are scattered, with the arrangement position of the dust removing device 1 as the starting point.
  • the direction changing device 60 may be configured to be able to set the air blowing direction so that the air can be blown at least above the horizontal direction.
  • the dust removing device 1 arranged at a low position on the floor or the like can collect fine particles floating in the space above the floor.
  • the direction changing device 60 is configured to be able to set the air blowing direction so that the air can be blown upward at an elevation angle of 0 degrees or more, more preferably, an elevation angle of 30 degrees or more. It is good to have been. This makes it possible to effectively disperse the droplets 2 that drop with the passage of time at a position away from the dust removing device 1.
  • the direction changing device 60 is configured to be able to change the ejection direction of the droplet 2 from the nozzle 20 to the same direction as the blowing direction of the air from the blower 10. That is, in the dust remover 1 according to some embodiments, the plurality of nozzles 20 are attached to the housing 11 of the blower 10 via the supply pipe 22 and the pipe attachment portion 24. In the dust removing device 1 according to some embodiments, the direction changing device 60 can change the posture of the housing 11 of the blower 10. Therefore, the jetting direction of the droplet 2 from the nozzle 20 can be changed to the same blowing direction of the air from the blower 10, so that the droplet 2 can be efficiently applied to the flow of air blown from the blower 10.
  • the spray amount of the liquid may be 0.01 (l / min) or more per region 1 (m 3 ) where the fine particles are removed.
  • the electric field strength formed at the tip 20a of the nozzle 20 is preferably 0.5 (kV / cm) or more and 10 (kV / cm) or less.
  • the droplet diameter of the droplet 2 is preferably 10 ( ⁇ m) or more and 300 ( ⁇ m) or less in terms of Sauter average diameter.
  • the polarization charge amount q per unit area when the droplet 2 is assumed to be a sphere is expressed by the following equation (4).
  • q 3 ⁇ ⁇ 0 ⁇ E ⁇ ( ⁇ s ⁇ 1) / ( ⁇ s +2) (4)
  • ⁇ 0 is the dielectric constant in vacuum
  • ⁇ 0 8.854 ⁇ 10 ⁇ 12 (F / m).
  • the charge amount Qp of one droplet 2 is the product of the polarization charge amount q per unit area and the surface area s of one droplet 2, and is given by the following equation (5).
  • this charge amount (Np ⁇ Qp) is a value when the spray amount is 9 (l / min), it is 0.015 (mA) when converted per spray amount 1 (l / min).
  • the value of this current (0.015 (mA)) represents the amount of charge carried by the droplets 2 sprayed at a spray rate of 1 (l / min) as a current. Further, since the droplet 2 is diffused into the atmosphere by the blown air blown from the blower 10, the current value calculated as described above is divided by the opening area of the blowout portion 13 of the blower 10 to obtain the blower. It is possible to obtain the apparent current density of the blown air containing the droplets 2 in the blowing portion 13 of 10.
  • the inner diameter of the blowout portion 13 of the blower 10 is, for example, 300 (mm)
  • the value of the current flowing between the nozzle 20 and the ground 9 is, as described above, per unit time carried by the droplet 2. Equal to the amount of charge. Therefore, by measuring the value of the current flowing between the nozzle 20 and the ground 9, the amount of charge carried by the droplet 2 per unit time can be obtained. Furthermore, by measuring the flow rates of the liquids supplied to all the nozzles 20, the apparent current density of the blown air containing the droplets 2 in the blowout part 13 of the blower 10 can be calculated as the spray amount 1 (l / min). It can be obtained as a value around.
  • the blown air containing the droplets 2 in the blowout unit 13 of the blower 10 is also taken into consideration.
  • the apparent current density may be 0.3 (mA / m 2 ) or less per spray amount 1 (l / min). That is, when the leakage current does not flow between the nozzle 20 and the counter electrode 31, the current flowing between the nozzle 20 and the ground 9 is about 1 (l / min) of the ejection amount of the droplet 2 and the blowing portion. It is considered that it may be 0.3 (mA / (m 2 ⁇ l / min) or less per opening area 1 (m 2 ) of 13.
  • the current flowing between the nozzle 20 and the ground 9 causes the droplet ejection amount 1 Even if it is 0.3 mA / (mA / (m 2 ⁇ l / min) or less per (l / min) and the opening area 1 (m 2 ) of the blowout portion 13, for example, in a gymnasium or an indoor stadium.
  • the droplets can be charged so as to effectively collect fine particles in the atmosphere in such a relatively large space or outdoors.
  • the current density (10 (mA / m 2 )) needs to be the above in the cross section where the droplets are sprayed.
  • the counter electrode 31 is replaced with one discharge electrode for performing corona discharge, and the other discharge electrode for performing corona discharge is arranged in the blowing portion 13.
  • the current density (10 (mA / m 2 )) is at least in the region between the discharge electrodes, in the region where the blowout portion 13 is projected when the blowout portion 13 is viewed from the downstream side in the blowing direction.
  • the present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments, and forms obtained by appropriately combining these forms.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Electrostatic Separation (AREA)
  • Air Humidification (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

La présente invention concerne un dispositif d'élimination de poussière comprenant : au moins une buse qui est disposée dans une partie de soufflage pour l'air soufflé, est apte à pulvériser un liquide fourni sous la forme de gouttelettes, et est reliée à la terre ; une partie d'électrode qui comprend une contre-électrode qui est formée de manière à entourer au moins la moitié de la circonférence d'une ouverture, avec une contre-électrode prévue pour une buse, et la contre-électrode étant disposée de manière à être séparée de la buse dans la direction dans laquelle la buse pulvérise les gouttelettes ; et un dispositif de génération de haute tension qui a une borne de masse connectée à la terre, et qui est destinée à appliquer une haute tension à la contre-électrode qui est connectée à un terminal de sortie. Si un courant de fuite ne circule pas entre la buse et la contre-électrode, le courant circulant entre la buse et la terre n'est pas supérieur à 0,3 milliampères (mètres carrés/litre par minute) pour chaque litre par minute de pulvérisation de gouttelettes et chaque mètre carré de la surface d'ouverture de la partie de soufflage
PCT/JP2019/041053 2018-10-26 2019-10-18 Dispositif d'élimination de poussière WO2020085231A1 (fr)

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JP2018202126A JP2020065994A (ja) 2018-10-26 2018-10-26 除塵装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020081915A (ja) * 2018-11-16 2020-06-04 鹿島建設株式会社 可搬型噴霧装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH036846A (ja) * 1989-06-02 1991-01-14 Mitsubishi Electric Corp 樹脂封止形半導体装置
JPH0491742A (ja) * 1990-08-06 1992-03-25 Kenjiro Hamashima 室内のノミ取り器
JP2006097960A (ja) * 2004-09-29 2006-04-13 Matsushita Electric Ind Co Ltd 空気浄化装置および空気清浄機および加湿器
JP2008084789A (ja) * 2006-09-28 2008-04-10 Tokyo Univ Of Science 除電装置
JP2008517742A (ja) * 2004-10-20 2008-05-29 ザ プロクター アンド ギャンブル カンパニー 内部電極及び外部電極を備える静電スプレーノズル
JP2008295937A (ja) * 2007-06-04 2008-12-11 Mitsubishi Electric Corp 空気清浄装置
JP2009045594A (ja) * 2007-08-22 2009-03-05 Daikin Ind Ltd 厨房排気処理装置
JP2013227806A (ja) * 2012-04-26 2013-11-07 Kajima Corp 帯電水粒子散布装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH036846A (ja) * 1989-06-02 1991-01-14 Mitsubishi Electric Corp 樹脂封止形半導体装置
JPH0491742A (ja) * 1990-08-06 1992-03-25 Kenjiro Hamashima 室内のノミ取り器
JP2006097960A (ja) * 2004-09-29 2006-04-13 Matsushita Electric Ind Co Ltd 空気浄化装置および空気清浄機および加湿器
JP2008517742A (ja) * 2004-10-20 2008-05-29 ザ プロクター アンド ギャンブル カンパニー 内部電極及び外部電極を備える静電スプレーノズル
JP2008084789A (ja) * 2006-09-28 2008-04-10 Tokyo Univ Of Science 除電装置
JP2008295937A (ja) * 2007-06-04 2008-12-11 Mitsubishi Electric Corp 空気清浄装置
JP2009045594A (ja) * 2007-08-22 2009-03-05 Daikin Ind Ltd 厨房排気処理装置
JP2013227806A (ja) * 2012-04-26 2013-11-07 Kajima Corp 帯電水粒子散布装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020081915A (ja) * 2018-11-16 2020-06-04 鹿島建設株式会社 可搬型噴霧装置
JP7145736B2 (ja) 2018-11-16 2022-10-03 鹿島建設株式会社 可搬型噴霧装置

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