EP0991478A1 - Procede et dispositif de fabrication d'un aerosol - Google Patents

Procede et dispositif de fabrication d'un aerosol

Info

Publication number
EP0991478A1
EP0991478A1 EP98935016A EP98935016A EP0991478A1 EP 0991478 A1 EP0991478 A1 EP 0991478A1 EP 98935016 A EP98935016 A EP 98935016A EP 98935016 A EP98935016 A EP 98935016A EP 0991478 A1 EP0991478 A1 EP 0991478A1
Authority
EP
European Patent Office
Prior art keywords
wall
particle
permeable wall
permeable
fluid particles
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.)
Withdrawn
Application number
EP98935016A
Other languages
German (de)
English (en)
Inventor
Stephan Rieth
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0991478A1 publication Critical patent/EP0991478A1/fr
Withdrawn legal-status Critical Current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
    • B05B7/0012—Apparatus for achieving spraying before discharge from the apparatus
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/005—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space with combinations of different spraying or vaporising means
    • F23D11/007—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space with combinations of different spraying or vaporising means combination of means covered by sub-groups F23D11/10 and F23D11/24
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • B05B12/18—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area using fluids, e.g. gas streams
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2214/00—Cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/23—Screens

Definitions

  • the invention relates to a method and a device for the production of fluid particles, in particular the production of an aerosol.
  • a particle former is applied to one side of a permeable wall and pressed through the wall with the aid of a compressed gas flowing through the wall, forming the fluid particles.
  • the device according to the invention has a permeable wall, a device for applying a particle former to the permeable wall and a device for loading the permeable wall with a pressurized gas which penetrates the permeable wall and entrains the particle former and forms the fluid particles.
  • This solution of the invention can advantageously be used for fluid treatment of sensitive, easily deformable objects, in particular for cooling them.
  • a permeable wall in particular having pores
  • fluid particles with low kinetic energy can be formed under the action of the compressed gas flowing through the permeable wall, so that a fluid particle flow with extremely low energy per particle can be generated on the outlet side of the wall.
  • a particle flow for example formed by liquid nitrogen, can be used, for example, to cool and solidify a liquid surface without the deformation of the solidified liquid surface being recognizable due to the action of the flow.
  • the particle generator is preferably sprayed onto the pressurized wall, preferably using a spray jet which is large in cross section and at the same time essentially wets the entire surface of the permeable wall.
  • the device according to the invention has a spray nozzle for generating a spray jet to be directed onto the wall, the spray nozzle being provided for generating a spray jet which widens in particular in a conical shape and which covers the entire surface of the pressurized wall.
  • the permeability of the wall and the gas pressure are chosen with a continuous supply of the particle former such that a continuous particle flow with a low compared to the kinetic energy of the spray jet particles from the wall kinetic energy per particle emerges.
  • the device according to the invention has devices for adjusting the amount of particle generator transported by the spray jet per unit of time and devices for adjusting the amount of compressed gas flowing through the wall per unit of time, the amount of particle generator transported by the spray jet per unit of time via the pressure difference of the delivery pressure exerted on the particle generator and the Gas pressure of the compressed gas is adjustable.
  • the permeable wall could be provided as an interchangeable part, so that wall parts with different permeability can be used.
  • the permeable wall is preferably arranged essentially horizontally and the aerosol former is applied to the wall from above. In this case, the formation of particles is supported by gravity. However, the wall can assume any position and a particle generator can also be pressed vertically through the wall from bottom to top.
  • the wall is provided as the bottom wall of a pressure chamber which receives the spray jet and can be acted upon by the pressurized gas, the pressure chamber being in particular cylindrical and the bottom wall and the spray jet being arranged coaxially to the cylinder axis.
  • the pressure chamber can be preceded by a buffer volume that compensates for pressure fluctuations in the compressed gas.
  • the permeability of the permeable wall, the gas pressure and the amount of the particle former applied to the wall per unit of time are chosen such that the continuous removal of the particle former from the surface of the permeable wall into the wall prevents the formation of a coherent liquid level of the particle former. In this way it is ensured that spray droplets of the particle former hitting the surface of the permeable wall burst into smaller particle units.
  • the permeable wall has, in particular, pore-like passage channels, preferably with passage widths in the micrometer range (5-500 ⁇ m, depending on the pressure level).
  • permeable walls e.g. Sintered disks, in particular sintered disks made of metal, glass or ceramic, can be used. It is also conceivable that a permeable wall is used to generate a directed fluid particle flow, which has appropriately aligned passage channels.
  • the particle former can be formed by liquid nitrogen and the compressed gas by gaseous nitrogen.
  • Fig. 1 shows an essential part of a device according to the invention in a vertical
  • FIG. 2 shows a part used in the device of FIG. 1 for forming a pressure chamber in a vertical partial sectional view
  • FIG. 3 shows an essential part of a device according to a second exemplary embodiment according to the invention.
  • Reference number 1 denotes a cylindrical housing which is open at the bottom and closed at the top by an end wall 2. Through bores 3 with an upper internal thread 4 and a lower internal thread 5 are provided in the end wall 2. The upper internal thread 4 serves to connect a compressed gas line connection to a compressed gas source, not shown in the figures. In the end wall 2 there is also a central bore 6 with an internal thread into which an upper attachment piece 7 of a spray nozzle holder 8 provided with a corresponding external thread is inserted. Schr ⁇ ubb ⁇ r is.
  • the spray nozzle holder 8 has on its underside a further extension 9 with an external thread which can be screwed into a corresponding internal thread of a cylindrical insert 10, the spray nozzle holder 8 coming into contact with the ring-shaped shoulder 9 against the annular end face of the cylindrical insert 10.
  • the projection 9 projecting downward from the spray nozzle holder 8 is connected to a spray nozzle 11, in which baffles (not visible in FIG. 1) are provided for the atomization of a particle former to be sprayed.
  • the spray nozzle 1 1 generates a conically widening spray jet 12 of a particle generator, in the present case liquid nitrogen.
  • the liquid nitrogen is supplied to the spray nozzle 11 via a through channel 13 which crosses the spray nozzle holder 8 with the lugs 7 and 9 and which can be connected to a storage container for liquid nitrogen via connecting means (not shown in the figures).
  • the cylindrical insert 10 has an annular projection 14 with an annular groove 15.
  • An annular seal 16 made of a suitable sealing material such as e.g. Rubber or NBR inserted.
  • holes in the side wall of the cylindrical insert 10 are designated, which open outwards to an annular buffer chamber 18 and inwards to a pressure chamber 19 formed by the screwed-in cylindrical insert 10.
  • a porous metal sintered disk is designated in FIG. 1, which is pressed into a tapering section of the cylindrical insert 10 at its lower end, lying over its circumference, whereby it rests on an annular shoulder 21 formed on the cylindrical insert 10.
  • the sintered disk 20 made of stainless steel has a diameter of approximately 20 mm, a thickness of 2.5 mm and a pore size of 70 ⁇ m.
  • the cylindrical insert 10 is provided at its lower end with key engagement surfaces 22 in the manner of a nut.
  • the component containing the spray nozzle holder 8 with the lugs 7 and 9 and the spray nozzle 11 is first inserted into the interior thread of the bore 6 screwed into the end wall 2 of the cylindrical housing 1.
  • the cylindrical housing 1 is surrounded by a double wall, not shown, an intermediate space being formed between the wall shown and the second wall, not shown, for thermal insulation of the housing 1.
  • the part shown in FIG. 2 is inserted into the housing 1 and screwed onto the lower shoulder 9 of the spray nozzle holder 8, the end of the cylindrical part 10 against the annular shoulder 9 on the Spray nozzle holder 8 comes into contact.
  • the buffer space 18 is closed pressure-tight by the ring seal 16.
  • parts corresponding to the part 23 with through openings 24 of the desired width can be screwed into the bores 17 and / or the bores 5.
  • Said pressurized gas source and the reservoir for liquid nitrogen are provided with devices for regulating the pressure, not shown, so that the pressurized gas can reach the pressurized chamber 19 via the holes 3, the buffer chamber 18 and the drilled holes 17.
  • the pressure required to spray the liquid nitrogen through the spray nozzle 11 can also be regulated. So that the spray jet 12 can emerge from the spray nozzle 11 within the pressure chamber 19, the delivery pressure of the liquid nitrogen must be somewhat higher than the pressure of the nitrogen pressure gas used here.
  • the amount of the sprayed material can be regulated by the pressure difference, while the absolute value of the pressures is decisive for the throughput through the sintered disk 20.
  • the pressure difference and absolute values of the pressure are to be set so that no build-up occurs on the sintered disc with the generation of a liquid level.
  • Liquid nitrogen sprayed onto the sintered disk 20 strikes the pore-containing sintered disk 20, where the spray particles burst on the surface and are entrained by the pressurized compressed gas which flows continuously through the sintered disk.
  • the permeability of the sintered disk 20, the internal pressure of the nitrogen gas in the pressure chamber 19 and the amount of liquid nitrogen sprayed onto the sintered disk 20 per unit of time are such that no liquid level of the liquid nitrogen can form on the disk, but rather that liquid material is always sufficiently transported away from the wall surface inward while avoiding such liquid level formation.
  • the suitable conical widening of the spray jet 12, which covers the entire surface of the sintered disk 20, results in a uniform distribution of the liquid over the sintered disk 20.
  • the entrainment of liquid particles by the compressed gas flowing continuously through the sintered disk 20 leads to the formation of small aerosol particles in the narrow pores of the sintered disk 20, so that an aerosol flow emerges on the outside of the sintered disk 20 opposite the pressure chamber.
  • the parameters mentioned above are also dimensioned such that the kinetic energy per particle of this flow is very low compared to the energy of the spray particles in the spray jet 12. This low particle energy of the aerosol flow means that objects sensitive to deformation can be treated, for example cooled.
  • the present device can e.g. be used in the food industry to cool and solidify surfaces of pudding, the cooled and solidified surface showing no deformations caused by the cooling flow.
  • a flowing mist with a high concentration of the finest aerosol particles is formed behind the sintered disk 20, through which an intensive cooling effect on the surface in question can be achieved.
  • pressures of the compressed gas and throughput quantities of particle formers can be set by means of appropriate devices.
  • the sintered disk 20 can be removed from its press fit in the insert 10 and exchanged for another disk with a different permeability.
  • the permeability can be regulated via the pane thickness and the width of the through pores. Through different passages 24 having insert pieces 23 there are further possible variations of the compressed gas flow.
  • FIG. 3 where the same or equivalent parts are designated with the same reference number, however, provided with the letter a as in the exemplary embodiment described above.
  • the reference numeral 26 in FIG. 3 denotes a guide device arranged coaxially to an insert part 10a, which can be connected to a projecting ring part 14a of a cylindrical insert 10a via screw connections, not shown.
  • An annular space 27 with an annular outlet opening 28 is formed between the guide device 26 and the cylindrical insert 10a.
  • the annular space 27 is connected via passages 29 to a buffer space 18a for compressed gas.
  • the guide device 26 projects slightly beyond the lower end of the cylindrical insert 10a.
  • Compressed gas from the buffer volume 18a not only enters a pressure chamber 19a via connection openings (not visible in FIG. 3), but also through the passages 29 into the annular space 27 and emerges from the annular opening 28 with the formation of a hollow cylindrical flow.
  • This hollow cylindrical flow surrounds fluid particles emerging from a permeable wall 20a, which are generated from an aerosol former applied to the permeable wall 20a via a spray jet 12a from a spray nozzle 1a.
  • the device described could e.g. can also be used to generate a burner flame, wherein a compressed gas combustible with the aerosol can be used to form a very reactive mixture, and wherein the outer curtain has a cooling function for the nozzle and a protection and support function for the flame.
  • a cooling and protective gas independent of the compressed gas could also be introduced for this, e.g. Compressed air, argon and / or CO2 and O2.
  • permeable walls with layers of different permeability, wherein permeable walls arranged at a distance from one another can also be used with the formation of gaps.
  • the surface of the permeable wall could be curved, for example.
  • the outlet surface in a suitable manner for the fluid particles.
  • the compressed gas can perform the opposite function as an inert gas flow.
  • the pressure chamber 19 with the sintered disk 20 forms a second stage of material scattering and a damping stage.
  • All known nozzles can be used as the first stage, liquid nozzles, air scattering nozzles, ultrasonic nozzles, multi-component nozzles. The more gas phase that is passed through the first stage into the pressure chamber, the less additional compressed gas is required.
  • the device described above with a pressure chamber 19, which has a permeable wall 20 and in particular an inlet comprising nozzles 11 for pressurized media, can also be used to homogeneously mix different media with one another, gases with gases, liquids with liquids and gases with liquids.
  • a liquid flows through the pressure chamber, the porous wall forming a throttle.
  • a gas phase, a mixed phase or other liquid is then injected into the pressure chamber.
  • the media mix under the increased pressure in the pressure chamber. After passing through the porous wall, they are then mixed under reduced pressure.

Abstract

La présente invention concerne un procédé et un dispositif de fabrication d'un aérosol. Selon l'invention, un agent à former des particules est appliqué d'un côté d'une cloison perméable, au travers de laquelle il est pressé à l'aide d'un gaz sous pression, ce qui entraîne la formation de particules fluides. On forme ainsi des courants de particules fluides à très faible énergie cinétique par particule, qui peuvent servir par exemple au traitement, et notamment au refroidissement, d'objets facilement déformables. D'autres applications, notamment comme brûleur, reposent sur la grande capacité de réaction des mélanges gazeux particulaires que l'invention permet d'obtenir.
EP98935016A 1997-07-04 1998-07-03 Procede et dispositif de fabrication d'un aerosol Withdrawn EP0991478A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19728622 1997-07-04
DE19728622A DE19728622A1 (de) 1997-07-04 1997-07-04 Verfahren und Vorrichtung für die Erzeugung eines Aerosols
PCT/EP1998/004112 WO1999001228A1 (fr) 1997-07-04 1998-07-03 Procede et dispositif de fabrication d'un aerosol

Publications (1)

Publication Number Publication Date
EP0991478A1 true EP0991478A1 (fr) 2000-04-12

Family

ID=7834662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98935016A Withdrawn EP0991478A1 (fr) 1997-07-04 1998-07-03 Procede et dispositif de fabrication d'un aerosol

Country Status (4)

Country Link
US (1) US6367715B1 (fr)
EP (1) EP0991478A1 (fr)
DE (1) DE19728622A1 (fr)
WO (1) WO1999001228A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2383058A1 (fr) * 1999-09-13 2001-05-31 Nahed Mohsen Systeme et procede de commande d'ecoulement d'air d'aerosol
FR2834554B1 (fr) * 2002-01-09 2006-06-30 Air Liquide Procede et dispositif de refroidissement d'une veine de fluide gazeux, et procede de refroidissement d'articles
DE10223787B4 (de) * 2002-05-29 2004-07-22 Karl Perr Vorrichtung zur Nachtrocknung von Druckluftschaum
DE112011105041B4 (de) * 2011-03-15 2020-11-05 Toshiba Mitsubishi-Electric Industrial Systems Corporation Filmbildungsvorrichtung
WO2013009883A1 (fr) 2011-07-11 2013-01-17 Jay Kumar Dispositif de vaporisation
BR112017022116A2 (pt) * 2015-04-16 2018-07-03 Nanovapor Inc. aparelho para a geração de nanopartículas.

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US1594641A (en) * 1921-06-25 1926-08-03 Starr Fletcher Coleman Method of and apparatus for atomizing
GB409918A (en) * 1933-06-15 1934-05-10 Frank Staines An improved method and means for atomizing and aerating liquids
NL72152C (fr) * 1947-10-14 1900-01-01
FR1364785A (fr) * 1963-05-17 1964-06-26 Appareil générateur de brouillard et d'aérosol
FR2291800A1 (fr) 1974-11-22 1976-06-18 Bertin & Cie Procede pour produire et distribuer un brouillard de particules liquides en suspension dans un milieu gazeux et dispositifs de mise en oeuvre du procede
JPS59153164A (ja) * 1983-02-21 1984-09-01 Jeol Ltd 液体クロマトグラフ質量分析装置
DE8308263U1 (de) * 1983-03-21 1983-09-08 Rheinische Braunkohlenwerke AG, 5000 Köln Loeschvorrichtung
US4690332A (en) * 1983-11-28 1987-09-01 Nathaniel Hughes Single inlet prepackaged inhaler
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JPH0781766B2 (ja) * 1990-07-13 1995-09-06 昭和炭酸株式会社 浸漬型フリーザーおよび液体窒素用ノズル
GB9303212D0 (en) * 1993-02-17 1993-03-31 Air Prod & Chem Method and apparatus for freezing
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Non-Patent Citations (1)

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Title
See references of WO9901228A1 *

Also Published As

Publication number Publication date
WO1999001228A8 (fr) 1999-04-29
WO1999001228A1 (fr) 1999-01-14
US6367715B1 (en) 2002-04-09
DE19728622A1 (de) 1999-01-07

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