EP1768805A1 - Dispositif et procede de pulverisation de films de liquide - Google Patents

Dispositif et procede de pulverisation de films de liquide

Info

Publication number
EP1768805A1
EP1768805A1 EP05750348A EP05750348A EP1768805A1 EP 1768805 A1 EP1768805 A1 EP 1768805A1 EP 05750348 A EP05750348 A EP 05750348A EP 05750348 A EP05750348 A EP 05750348A EP 1768805 A1 EP1768805 A1 EP 1768805A1
Authority
EP
European Patent Office
Prior art keywords
gas
nozzle
atomizing
liquid
venturi nozzle
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.)
Ceased
Application number
EP05750348A
Other languages
German (de)
English (en)
Inventor
Karl Rimmer
Gunther Schulz
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.)
IMR-Metalle und Technologie GmbH
Original Assignee
IMR-Metalle und Technologie 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 IMR-Metalle und Technologie GmbH filed Critical IMR-Metalle und Technologie GmbH
Publication of EP1768805A1 publication Critical patent/EP1768805A1/fr
Ceased legal-status Critical Current

Links

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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0861—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with one single jet constituted by a liquid or a mixture containing a liquid and several gas jets
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/025—Nozzles having elongated outlets, e.g. slots, for the material to be sprayed

Definitions

  • the invention relates to a method and an apparatus for atomizing liquid films.
  • DE 197 58 111 A discloses a method for producing metal powders.
  • the molten metal emerges in the form of a film from a melt nozzle with a slot-shaped outlet opening.
  • the film is stabilized by a laminar gas flow in a Laval gas nozzle and then finely atomized.
  • the productivity of the nozzle system can be changed as desired by extending the nozzle slot without adversely affecting the powder quality.
  • the Laval nozzle used in the method according to DE 197 58 111 A by definition has a converging-diverging geometry and has at least the critical pressure ratio of the gas used before and after the nozzle.
  • a disadvantage of the process described in DE 197 58 111 A is the need for the liquid (melt) to be atomized to be introduced into the melt nozzle under high pressure, for example 25 bar. This requires expensive, large pressure vessels. When atomizing metal melts, the production and processing of large quantities of melt at high temperatures in a pressure vessel must be critically assessed from a safety point of view, increases costs and inhibits the large-scale application of the process.
  • the object of the invention is to provide a method and a device suitable for carrying out the same, which allows the (industrial) fine atomization of liquid films for the production of fine droplets from molten metals, without the procedural complexity of preparing and processing one melt under high pressure.
  • This object is achieved with a method which has the features of claim 1 and with a device which has the features of the independent main device claim.
  • Preferred and advantageous embodiments of the invention are the subject of the dependent claims.
  • the process according to the invention is suitable for producing fine powders which form from the droplets of the liquid after atomization by cooling and solidification.
  • the process according to the invention can be used to produce semifinished products from these drops of metal melt by solidifying them on a suitable substrate.
  • the method according to the invention is also suitable for the production of powders e.g. suitable by spray drying if the atomized liquid is a solution or a dispersion.
  • the stabilization of liquid films, in particular melt films is also possible according to the invention with a subcritical, laminar gas flow which is generated in a converging-diverging Venturi nozzle.
  • a subcritical, laminar gas flow which is generated in a converging-diverging Venturi nozzle.
  • the liquid film stabilized in the process according to the invention is not atomized immediately after passing through the narrowest point of the Venturi nozzle, but rather disintegrates only at a clear distance from its narrowest point due to instabilities and under the influence of the surface tension of the melt.
  • the liquid film in the region of the path between the narrowest point of the Venturi gas nozzle and the self-decay point can be replaced by one or more flat, linear gas jets are hit and atomized in a targeted manner.
  • the admission pressure of the atomizing gas emerging from the linear gas nozzles can be adjusted to adjust the powder fineness independently of the admission pressure of the auxiliary gas flow stabilizing the liquid film.
  • the geometry of the atomizing gas jets is selected so that a completely enclosed space is created below the Venturi nozzle.
  • the space created in this way can also be limited by components at the two ends of the linear Venturi nozzle.
  • the atomizing jets behave like free jets and suck in gas particles from the gas atmosphere surrounding them. This creates a negative pressure in the intake area. Due to the negative pressure in the volume enclosed by the atomizing gas jets in the outlet part of the Venturi nozzle, a pressure drop arises in relation to the gas space in the inlet part of the Venturi nozzle, as a result of which a flow is formed in the Venturi nozzle. In the gas space above the Venturi nozzle, the pressure is kept constant by introducing gas, so that constant pressure and flow conditions ultimately arise. The auxiliary gas flow in the Venturi nozzle can now be used to stabilize the melt film.
  • FIG. 1 shows schematically and in side view an arrangement for atomizing according to the invention
  • FIG. 2 shows in an oblique view another embodiment of a device according to the invention.
  • the invention is described below by way of example with reference to a molten metal as "liquid”, it is not limited to molten metal, but is suitable for atomizing any liquid with the aim of producing fine liquid droplets.
  • molten metal 2 is increasingly tapered to a melt nozzle 3.
  • the nozzle 3 has a slot-shaped outlet opening, so that the melt emerges from it in the form of a film.
  • a gas nozzle 5 which is designed as a Venturi nozzle, is provided on both sides of the film, which is symbolized by the arrows 6 and is supplied linearly with atomizing gas.
  • the gas emerging from the gas nozzles 5 creates a negative pressure which draws gas from the gas space 1 in the direction of the arrows 4.
  • the melt film emerging from the nozzle 3 is stabilized by the gas streams drawn in in the direction of the arrows 4 and hitting the melt film from both sides. Only in the area of the mouths of the gas nozzles 5 is the melt film atomized into a tent-shaped particle spray cone 8.
  • Fig. 2 shows the arrangement shown schematically in Fig. 1 again in an oblique view. It can be seen that here too the melt film, which emerges from the nozzle 3 under the action of the atomizing gas jets (linear jet) which emerge from the gas nozzles 5, is atomized to form a tent-shaped particle spray cone 8.
  • Example 1 (Vacuum on the Venturi nozzle due to the suction effect of the atomizing gas jets) A tin melt with a temperature of 300 'C flows out of a linear melt nozzle with an outlet opening of 0.5 mm width and a length of 30 mm. The melt mass flow is 4.6 kg / min.
  • the Venturi nozzle consists of two individual nozzles, each with a slit-shaped gas outlet nozzle measuring 40 mm in length and 0.5 mm width.
  • the atomizing gas pressure upstream of the gas nozzle is 0.6 MPa.
  • the angle between the atomizing gas nozzles is 60 ".
  • the distance between the two linear Venturi nozzles is 6 mm at the narrowest point. Air is used as atomizing gas and as stabilizing gas.
  • a stabilizing gas flow builds up through the entire Venturi nozzle melt film emerging from the melt nozzle is fed in, stabilized and finally atomized After the metal droplets have solidified, a powder with a mean particle size d 50 of 37 ⁇ m measured by laser granulometry is obtained.
  • Example 2 (slight overpressure above the Venturi nozzle)
  • Tin melt emerges from a linear melt nozzle with a rectangular opening of 0.7 x 20 mm at a mass flow of 5.1 kg / min.
  • the overpressure of the auxiliary gas stabilizing the melt film in front of the Venturi nozzle is 0.85 bar, the boiler overpressure behind the
  • Venturi nozzle is 0.02 bar. 5 mm below the narrowest point of the
  • Venturi nozzle until then the stable melt film is hit by two flat gas jets, which flow out of linear Laval nozzles with a narrowest cross section of 0.5 x 35 mm and meet together in a line with the melt film.
  • the pressure of the atomizing gas in front of the linear Laval nozzles is 28 bar.
  • the film is atomized, and after the droplets have solidified, a powder product with an average grain diameter d 50 of 9.1 ⁇ m is obtained.
  • the specific gas consumption when using nitrogen as auxiliary and atomizing gas is 1.7 Nm 3 / kg powder.
  • an embodiment of the invention can be used to atomize liquid films into fine droplets, the liquid 2 is discharged in the form of a straight film from an elongated slot nozzle 3.
  • the outlet opening of the slit nozzle 3 is located within a linear venturi nozzle 5, in the divergent part of which linear gas outlet openings 7 (Laval nozzles) are let in, which are acted upon by gas 6.
  • gas streams 4 are sucked in from both sides of the liquid film and delimited by the convergent part of the Venturi nozzle 5, which stabilize the liquid film, so that the liquid film only passes through the narrowest one Place the Venturi nozzle 5 is atomized into a tent-shaped cone of liquid droplets.

Landscapes

  • Nozzles (AREA)

Abstract

L'invention concerne un procédé de pulvérisation de films de liquide sous forme de fines gouttelettes, consistant à distribuer le liquide (2) sous forme d'un film linéaire à partir d'une buse à fente allongée (3). L'ouverture de sortie de la buse à fente (3) se situe à l'intérieur d'une buse de Venturi linéaire (5) dont la partie divergente comporte des ouvertures de distribution de gaz linéaires (7) (buses de Laval), alimentées en gaz (6). La dépression créée au niveau des buses de Laval (7) provoque une aspiration de courants de gaz (4) à partir de volumes de gaz (1) disposés sur les deux côtés du film de liquide, délimités par la partie convergente des buses de Venturi (5). Lesdits courants de gaz stabilisent le film de liquide de telle manière que celui-ci est uniquement pulvérisé sous forme de cône en forme de tente composé de gouttelettes de liquide après passage au travers de la zone la plus étroite de la buse de Venturi (5).
EP05750348A 2004-06-17 2005-06-16 Dispositif et procede de pulverisation de films de liquide Ceased EP1768805A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0102704A AT413082B (de) 2004-06-17 2004-06-17 Verfahren und vorrichtung zum zerstäuben von flüssigkeitsfilmen
PCT/AT2005/000213 WO2005123311A1 (fr) 2004-06-17 2005-06-16 Dispositif et procede de pulverisation de films de liquide

Publications (1)

Publication Number Publication Date
EP1768805A1 true EP1768805A1 (fr) 2007-04-04

Family

ID=34427288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05750348A Ceased EP1768805A1 (fr) 2004-06-17 2005-06-16 Dispositif et procede de pulverisation de films de liquide

Country Status (4)

Country Link
US (1) US20070215712A1 (fr)
EP (1) EP1768805A1 (fr)
AT (1) AT413082B (fr)
WO (1) WO2005123311A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7776213B2 (en) * 2001-06-12 2010-08-17 Hydrotreat, Inc. Apparatus for enhancing venturi suction in eductor mixers
JP5913361B2 (ja) * 2010-12-24 2016-04-27 ユニリーバー・ナームローゼ・ベンノートシヤープ 手洗い装置
DE102013022096B4 (de) 2013-12-20 2020-10-29 Nanoval Gmbh & Co. Kg Vorrichtung und Verfahren zum tiegelfreien Schmelzen eines Materials und zum Zerstäuben des geschmolzenen Materials zum Herstellen von Pulver

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1270740B (de) * 1962-02-09 1968-06-20 Basf Ag Vorrichtung zum Verspruehen bzw. Zerstaeuben fluessiger Medien
US3592391A (en) * 1969-01-27 1971-07-13 Knapsack Ag Nozzle for atomizing molten material
US3942723A (en) * 1974-04-24 1976-03-09 Beloit Corporation Twin chambered gas distribution system for melt blown microfiber production
JPS5857374B2 (ja) * 1975-08-20 1983-12-20 日本板硝子株式会社 繊維の製造方法
JPS62151503A (ja) * 1985-12-25 1987-07-06 Kobe Steel Ltd 金属粉末の製造方法
DE3839739C1 (fr) * 1988-08-30 1989-10-05 Mannesmann Ag, 4000 Duesseldorf, De
GB9004214D0 (en) * 1990-02-24 1990-04-18 Rolls Royce Plc An apparatus and method for atomising a liquid
JPH05148514A (ja) * 1991-10-01 1993-06-15 Hitachi Metals Ltd 溶融金属の噴霧装置
US6254661B1 (en) * 1997-08-29 2001-07-03 Pacific Metals Co., Ltd. Method and apparatus for production of metal powder by atomizing
DE19758111C2 (de) 1997-12-17 2001-01-25 Gunther Schulz Verfahren und Vorrichtung zur Herstellung feiner Pulver durch Zerstäubung von Schmelzen mit Gasen
DE10237213B4 (de) * 2002-08-14 2007-08-02 Universität Bremen Verfahren und Vorrichtung zum Herstellen von Metallpulver und keramischem Pulver

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005123311A1 *

Also Published As

Publication number Publication date
US20070215712A1 (en) 2007-09-20
WO2005123311A1 (fr) 2005-12-29
ATA10272004A (de) 2005-04-15
AT413082B (de) 2005-11-15

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