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EP2477751B1 - Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux - Google Patents

Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux Download PDF

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Publication number
EP2477751B1
EP2477751B1 EP10754292.0A EP10754292A EP2477751B1 EP 2477751 B1 EP2477751 B1 EP 2477751B1 EP 10754292 A EP10754292 A EP 10754292A EP 2477751 B1 EP2477751 B1 EP 2477751B1
Authority
EP
European Patent Office
Prior art keywords
gas
powder
container
fill level
impinged
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.)
Not-in-force
Application number
EP10754292.0A
Other languages
German (de)
English (en)
Other versions
EP2477751A1 (fr
Inventor
Eckart Theophile
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Relyon Plasma GmbH
Original Assignee
Reinhausen Plasma GmbH
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.)
Filing date
Publication date
Application filed by Reinhausen Plasma GmbH filed Critical Reinhausen Plasma GmbH
Publication of EP2477751A1 publication Critical patent/EP2477751A1/fr
Application granted granted Critical
Publication of EP2477751B1 publication Critical patent/EP2477751B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
    • B05B7/201—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
    • B05B7/205—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/42—Plasma torches using an arc with provisions for introducing materials into the plasma, e.g. powder or liquid

Definitions

  • the invention relates to a method and apparatus for conveying and distributing powders in a gas stream.
  • Such methods and conveyors are used for feeding metered quantities of fine-grained powders, in particular for coatings. Powder deposits and agglomerations of the powder in the conveyor as well as the powder flow paths must be avoided.
  • the DE 44 23 197 discloses a powder powder pump for spray coating articles in a rod-like elongated shape.
  • the powder pump On one end face, the powder pump has a powder suction opening over which Powder is sucked from an open-topped powder container and conveyed through an inner tube of the powder pump to a consumer.
  • the promotion itself is done by generating a vacuum in the powder pump.
  • the vacuum is created with an injector nozzle located near the powder suction port.
  • the DE 10 2006 002 582 A1 discloses a powder conveyor with a fluidising unit.
  • the fluidizing unit is arranged at the end of a powder suction pipe of the powder conveyor and blows in the intake of the powder suction fluidizing air into the powder supply, so that the powder can be fluidized and thus easier to be sucked and transported.
  • the fluidising unit is arranged above and concentric with the powder suction opening. As a result, a screen-shaped fluidized powder region forms around the intake opening.
  • the promotion takes place by means of an injector operating with compressed air, which is connected to the opposite of the Fluidisiertechnik end of Pulveransaugrohres. Fluidization directly below the Pulveransaugö réelle done by design not.
  • annular fluidization improves the suction of the powder, the constancy of the amount of powder in the suction is not optimal. Furthermore, agglomerates of the powder are insufficiently dissolved and largely sucked directly through the powder suction. This leads to problems, in particular in downstream coating processes which require a constant layer thickness.
  • the US patent application US 2009/110529 A1 discloses a method according to the preamble of claim 1 and describes a method for transferring shredded clay material for use in drilling fluids.
  • a pneumatic transfer vessel is provided to provide the shredded clay material. Air can be injected into the transfer vessel via an air inlet. The air inlet is designed as a lance projecting into the transfer vessel, the mouth of which is directed from above onto a surface of the shredded clay material in the pneumatic transfer barrel. The air-impacted, crushed clay material is transferred via a line into a storage container.
  • the invention is based on the object to provide a method for conveying and distributing powders in a gas stream, the promotion of extremely fine powders, especially those with a particle size of less than 10 microns, with small amounts of gas allowed in the case of agglomerations of the powder are nevertheless avoided or dissolved and at the same time a uniform distribution of the powder is achieved in the gas stream. Furthermore, a simple device for agglomeration-free promotion and even distribution of particularly extremely fine powders (with a particle size of less than 10 microns) in a gas stream with small amounts of gas to be proposed.
  • This object is achieved in a method of the type mentioned above in that the level of the powder in the closed container is kept constantly above a minimum level, and the powder below the minimum level on the at least one standing in contact with the powder gas inlet directly Gas is applied.
  • the periodic loading of the powder with the pressurized gas causes the powder to be swirled up into the free space above the powder and distributed there.
  • the pressure pulses dissolve any agglomerates of the powder.
  • the resulting above the ambient pressure in the interior of the closed container due to the gas pressure overpressure causes the thus whirled powder / gas mixture flows out in the direction of each arranged above the maximum level of the container outlet.
  • An optimal distribution of the powder in the gas space above the powder level is achieved by a low-frequency loading of the powder in a range of 1 Hz to 100 Hz.
  • the overpressure of the introduced into the closed container (pressure vessel) gas is preferably in the range of 100 mbar to 5 bar.
  • a higher delivery rate is achieved in that the powder is acted upon by several, in particular four gas inlets with the gas under pressure.
  • the distribution of the powder in the gas and the dissolution of existing agglomerates can be improved by mixing the powder over several the gas is applied to the gas inlets that are triggered in succession.
  • the gas pressure pulses act on the powder without time interruptions between two successive gas pressure pulses. If the gas inlets are arranged uniformly over the circumference of the container, preferably in a container level, the admission takes place circumferentially around the container.
  • a further improvement in the swirling and distribution of the powder in the space above the powder in the container is achieved when the application of one or more gas jets at an angle of at most 45 degrees to the surface of the powder. It is assumed that the surface of the powder bed is essentially flat.
  • the level of the powder in the closed container is always kept above a minimum fill level and the powder is directly exposed to gas below the minimum fill level via at least one gas inlet in contact with the powder ,
  • the pressure pulses are particularly effectively transferred to the powder and dissolved as a result, the agglomerates extremely effective.
  • the pressurized gas flows through the powder into the overlying free space and conveys the powder / gas mixture fluidized by the pressure pulses toward each outlet.
  • the outlet can be connected in an advantageous embodiment of the invention with a hose, with which the powder / gas mixture is fed to another process, in particular a coating process.
  • the powder is replenished from a refill container via an inlet into the container.
  • the refill container is under the same overpressure as the closed container, is refilled in the.
  • the level of the powder is kept in the closed container constantly above a minimum level.
  • a particularly effective periodic loading of the powder with gas under overpressure is preferably carried out by means of a directed gas jet.
  • each gas inlet is located at a nozzle that projects in particular into the interior of the container, but at least opens into the interior of the container.
  • the nozzle has a corresponding angle of attack.
  • the closed container for receiving the powder is designed in particular circular-cylindrical.
  • the gas inlets are preferably arranged in a plane of the circular cylindrical container over its circumference, so that the center angle coincides between all gas inlets.
  • the individual inlets are supplied with the aid of control means, in particular a valve control, periodically with gas.
  • the individual inlets can be subjected to gas in succession or partially overlapping in time or in a temporally overlapping manner. In the latter case, all gas inlets are simultaneously exposed to gas in a periodic sequence.
  • the circulating admission via several inlets can take place with short interruptions, so that at least temporarily no gas enters the container via any of the inlets.
  • At least one nozzle is arranged parallel to a secant with respect to the circular bottom of the container, the secant being at a distance from the latter Center runs.
  • the closed container is connected via a pipe to a refilling container for the powder, wherein from the preferably larger refill container powder automatically runs in the closed container for the distribution and delivery of the powder.
  • the mouth of extending into the interior of the container pipe is just below the maximum level of the container.
  • FIG. 1 Apparatus for conveying and distributing powders 5 in a gas stream, hereinafter referred to as "powder conveyor” 1 for short, consists essentially of a closed container 2, which is connected via a gas inlet 3 with means, not shown, for supplying gas.
  • the container 2 is filled to a maximum level 4 with a fine powder 5, which is to be supplied to a subsequent process, in particular a coating process.
  • the outlet 6 is in particular equipped with a connection for a hose line 19 for the forwarding of the powder / gas mixture 7 to the downstream process.
  • the means for gas supply connected to the gas inlet 3 comprise as control means for the periodic control of the gas, in particular a valve control with which a pressurized gas in a periodic sequence via the gas inlet 3 is introduced into the interior of the container 2.
  • the valve control operates, for example, at a frequency of 10 Hz.
  • the height of the gas pressure is determined such that the pressure inside the container 2 is higher than the ambient pressure, whereby pressure losses in a hose line possibly connected to the powder outlet up to its mouth are to be considered ,
  • the introduced gas is preferably an inert gas to prevent dust explosions in the container 2.
  • the gas inlet 3 opens directly into the powder 5.
  • the gas inlets 3 it is also possible to arrange the gas inlets 3 above the maximum level 4 of the powder 5, so that the gas on the surface. 9 of the powder 5 hits.
  • the powder conveyor 1 after FIG. 2a differs from the powder conveyor after FIG. 1 in that the gas inlet 3 is located on a nozzle 10 which runs parallel to a secant 11 with respect to the circular bottom 12 of the container 2.
  • a spiral flow 13 of the powder / gas mixture 7 is generated in the container 2.
  • the outlet 6 having channel 8 is as out FIG. 2a recognizable, also aligned parallel to a secant with respect to the circular bottom 2 of the container 2.
  • FIG. 2b shows a preferred embodiment of the powder conveyor 1 according to the invention with four offset by 90 degrees to each other, but arranged in a plane, gas inlets 3a - d and two outlets 6a - b for the powder / gas mixture 7.
  • the periodic loading of the gas inlets 3a - d with The pressurized gas can be simultaneously.
  • the gas inlets 3a-d are acted upon in chronological succession with the gas under overpressure, so that the gas from the gas supply unit outgoing pressure pulses to the container 2 circulate.
  • FIG. 3 shows a modification of the device according to FIG. 1 ,
  • the powder conveyor 1 differs essentially in that it two in the interior of the
  • Container 2 projecting nozzles 10 having an angle of attack 14 of about 25 degrees to the bottom 12 of the container 2, which have the gas inlets 3a - b. This angle of attack improves the dissolution of agglomerates in the fine powder 5.
  • the piping 16 for refilling the powder 5 extends into the interior of the container 2, with its mouth, as in particular FIG. 5a recognizable, just below the maximum level 4 of the container 2 is located.
  • the powder supply 18 in the refill container 15 is under the same pressure which also prevails in the interior of the container 2.
  • FIG. 6 shows an application example of the powder conveyor according to the invention 1.
  • the outlet 6 of the powder conveyor 1 is connected via a hose 19 with a beam generator 20 for generating a collimated plasma beam 21 by arc discharge.
  • the powder / gas mixture 7 is introduced in the region of its outlet 22.
  • the finely divided powder 5 is deposited with the plasma jet 21 on the surface 23 of an object 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Air Transport Of Granular Materials (AREA)

Claims (14)

  1. Procédé pour l'acheminement et la distribution de poudres (5) dans un courant de gaz, étant donné que
    • un récipient fermé (2) est rempli seulement jusqu'à un niveau de remplissage maximal (4) avec la poudre (5) ;
    • la poudre (5) est exposée via au moins une entrée de gaz (3) en séquence périodique à un gaz sous surpression ;
    • le mélange poudre/gaz (7) tourbillonné s'écoule du récipient (2) via au moins une sortie (6) disposée au-dessus du niveau de remplissage maximal (4) du récipient (2) ;
    caractérisé
    • en ce que le niveau de remplissage de la poudre (5) dans le récipient fermé (2) est maintenu constamment au-dessus d'un niveau de remplissage minimal (17) et la poudre (5) est directement exposée à un gaz au-dessous du niveau de remplissage minimal (17) par l'intermédiaire de la au moins une entrée de gaz (3) en contact avec la poudre (5).
  2. Procédé selon la revendication 1, dans lequel la poudre (5) est exposée au gaz avec une fréquence située dans la plage de 1 Hz à 100 Hz.
  3. Procédé selon la revendication 1 ou 2, dans lequel la poudre (5) est exposée au gaz sous surpression par l'intermédiaire d'une pluralité d'entrées de gaz (3a - 3d).
  4. Procédé selon la revendication 3, dans lequel la poudre (5) est exposée au gaz successivement dans le temps par l'intermédiaire des entrées de gaz (3a - 3d).
  5. Procédé selon une ou plusieurs des revendications 1 à 4, dans lequel l'exposition a lieu avec un jet de gaz ou plusieurs jets de gaz sous un angle d'inclinaison maximal de 45° par rapport à la surface (9) de la poudre (5).
  6. Procédé selon une ou plusieurs des revendications 1 à 5, dans lequel la surpression du gaz est située dans la plage de 100 mbar à 5 bar.
  7. Procédé selon une ou plusieurs des revendications 1 à 6, dans lequel l'appoint de poudre (5) se fait depuis un récipient de recharge (15) via une entrée du récipient (2) pendant l'acheminement et la distribution de la poudre (5) dans le courant de gaz.
  8. Dispositif pour l'acheminement et la distribution de poudres (5) dans un courant de gaz, avec un récipient fermé (2) pouvant être rempli jusqu'à un niveau de remplissage maximal (4) avec la poudre (5), au moins une entrée de gaz (3, 3a-d) raccordé à des moyens d'alimentation en gaz présentant des moyens d'alimentation en gaz des moyens de contrôle destinés à la commande périodique du gaz à chaque entrée de gaz (3, 3a-d), au moins une sortie (6, 6a-b) pour un mélange poudre/gaz (7) étant disposée au-dessus du niveau de remplissage maximal (4) du récipient (2), caractérisé en ce que chaque entrée de gaz (3, 3a-d) se trouve au-dessous d'un niveau de remplissage minimal (17) et le récipient (2) est relié par l'intermédiaire d'un conduit tubulaire (16) à un récipient de recharge (15) de poudre (5).
  9. Dispositif selon la revendication 8, dans lequel chaque entrée de gaz (3, 3ad) se trouve respectivement sur une buse (10) faisant en particulier saillie dans l'intérieur du récipient.
  10. Dispositif selon la revendication 9, dans lequel chaque buse (10) présente un angle d'inclinaison maximal de 45° par rapport à une surface de base du récipient (2).
  11. Dispositif selon l'une quelconque des revendications 8 à 10, étant donné que le récipient (2) est circulaire cylindrique.
  12. Dispositif selon la revendication 11, dans lequel plusieurs entrées de gaz (3, 3a-d) sont distribuées de manière uniforme sur la circonférence du récipient (2).
  13. Dispositif selon les revendications 11 à 12, dans lequel au moins une buse (10) court parallèlement à un sécante (11) par rapport à la base de forme circulaire (12) du récipient (2) qui court à une certaine distance du point central.
  14. Dispositif selon les revendications 8-13, dans lequel le conduit tubulaire (16) s'étend dans l'intérieur du récipient (2) et dont l'embouchure se trouve au-dessous du niveau de remplissage maximal (4) du récipient (2).
EP10754292.0A 2009-09-15 2010-08-24 Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux Not-in-force EP2477751B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910041338 DE102009041338A1 (de) 2009-09-15 2009-09-15 Verfahren und Vorrichtung zum Fördern und Verteilen von Pulvern in einem Gasstrom
PCT/EP2010/062304 WO2011032807A1 (fr) 2009-09-15 2010-08-24 Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux

Publications (2)

Publication Number Publication Date
EP2477751A1 EP2477751A1 (fr) 2012-07-25
EP2477751B1 true EP2477751B1 (fr) 2013-11-13

Family

ID=43357905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10754292.0A Not-in-force EP2477751B1 (fr) 2009-09-15 2010-08-24 Procédé et dispositif d'acheminement et de distribution de poudres dans un courant gazeux

Country Status (3)

Country Link
EP (1) EP2477751B1 (fr)
DE (1) DE102009041338A1 (fr)
WO (1) WO2011032807A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3238832B1 (fr) 2016-04-29 2020-08-12 Wagner International AG Dispositif de transport destine a transporter de la poudre de revetement vers un applicateur de poudre, installation de revetement de poudre et procede de fonctionnement d'un dispositif de revetement de poudre

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108950459A (zh) 2011-07-25 2018-12-07 埃卡特有限公司 用于基材涂布的方法以及含有添加剂的粉末涂料材料在该方法中的用途
DE102011052119A1 (de) 2011-07-25 2013-01-31 Eckart Gmbh Verfahren zur Substratbeschichtung und Verwendung additivversehener, pulverförmiger Beschichtungsmaterialien in derartigen Verfahren
JP6122666B2 (ja) * 2013-03-07 2017-04-26 東京エレクトロン株式会社 ホッパー及び溶射装置
US20160074903A1 (en) * 2013-04-20 2016-03-17 Mtek-Smart Corporation Applying or dispensing method for powder or granular material

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US3134513A (en) * 1960-09-30 1964-05-26 Dust Control Processes Ltd Insufflator
AT253428B (de) * 1964-02-21 1967-04-10 Gattys Tech Vorrichtung und Verfahren zum Austragen von Massengut aus einem Behälter
US3412898A (en) * 1966-02-07 1968-11-26 British Titan Products Powder feeder
FR2579573A1 (fr) * 1985-03-28 1986-10-03 Barron Claude Procede et dispositif pour l'extraction de substances pulverulentes et/ou granuleuses
FR2623421A1 (fr) * 1987-11-19 1989-05-26 Tsex Issl Melangeur pneumatique de materiaux pulverulents
AU6227094A (en) * 1992-12-17 1994-07-04 Nordson Corporation Improved powder coating system for difficult to handle powders
DE4423197A1 (de) 1994-07-01 1996-01-04 Gema Volstatic Ag Pulverpumpe, insbesondere für Pulver zum Sprühbeschichten von Gegenständen
US6986625B2 (en) * 2003-04-21 2006-01-17 Anthony John Witheridge Maintaining fluidized beds of cohesive particles using vibrating fluids
DE102006002582B4 (de) 2005-01-26 2019-07-04 J. Wagner Ag Fluidisiereinheit für einen Pulverförderer und Pulverförderer mit Fluidisiereinheit
US20090110529A1 (en) * 2007-10-31 2009-04-30 M-I Llc Pneumatic transfer of finely ground clay material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3238832B1 (fr) 2016-04-29 2020-08-12 Wagner International AG Dispositif de transport destine a transporter de la poudre de revetement vers un applicateur de poudre, installation de revetement de poudre et procede de fonctionnement d'un dispositif de revetement de poudre

Also Published As

Publication number Publication date
EP2477751A1 (fr) 2012-07-25
DE102009041338A1 (de) 2011-04-07
WO2011032807A1 (fr) 2011-03-24

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