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WO2016162813A1 - Broyeur à fluide - Google Patents

Broyeur à fluide Download PDF

Info

Publication number
WO2016162813A1
WO2016162813A1 PCT/IB2016/051964 IB2016051964W WO2016162813A1 WO 2016162813 A1 WO2016162813 A1 WO 2016162813A1 IB 2016051964 W IB2016051964 W IB 2016051964W WO 2016162813 A1 WO2016162813 A1 WO 2016162813A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzles
grinding chamber
grinding
fluid
chamber
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
PCT/IB2016/051964
Other languages
English (en)
Inventor
Piero M. LAISO
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.)
Ayla Sagl
Original Assignee
Ayla Sagl
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 Ayla Sagl filed Critical Ayla Sagl
Publication of WO2016162813A1 publication Critical patent/WO2016162813A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills

Definitions

  • the present invention concerns the particle grinding field and, in particular, a fluid grinding mill.
  • the Applicant posed the problem of implementing a grinding mill allowing to obtain a particle size smaller than one micron and, at the same time, not having the drawbacks of the mechanical mills in terms of overheating and pollution of the treated products.
  • a first aspect of the present invention concerns a fluid grinding mill comprising:
  • At least one grinding chamber comprising an inner perimeter; said grinding chamber being connected to said feeding device to feed the product to be ground;
  • said grinding chamber comprises:
  • At least one first plurality of injecting nozzles to inject process fluid into the grinding chamber; the nozzles of said at least one first plurality are angularly spaced out along the inner perimeter of said grinding chamber; each nozzle having an angle (a) with respect to said inner perimeter of the grinding chamber;
  • the nozzles of the second plurality being spaced out longitudinally in said grinding chamber with respect to the nozzles of said first plurality of nozzles; the nozzles of said at least one second plurality are angularly spaced out from one another along the inner perimeter of said grinding chamber;
  • selecting means adapted to selectively activate which of the plurality of nozzles has to be operated depending on the process and the grinding particle size to be obtained.
  • the present invention can have at least one of the preferred characteristics hereinafter described.
  • the grinding chamber comprises angle adjusting means to angularly adjust the position of each nozzle of said at least one plurality of the first nozzles with respect to the inner perimeter of the grinding chamber.
  • the selecting means are adapted to change an inner height, measured in the longitudinal direction, of the grinding chamber so that to vary the inner volume of the mixing chamber and to selectively select whether all plurality of nozzles, or only one or more, are allowed to give onto the inside of the mixing chamber thereby putting pressurized fluid into the grinding chamber.
  • the selecting means for selectively controlling the activation of the plurality of nozzles comprise at least two opposed lids of the grinding chamber, at least one lid being longitudinally movable in order to change its position and/or an inner height (H) of the grinding chamber thereby allowing all plurality of nozzles, or only one or more, to put pressurized fluid into the grinding chamber.
  • each lid is keyed on a threaded shaft rotated by convenient motor means, the rotation of said shaft by said motor means entailing the translation of at least one lid.
  • each lid there are sealing elements circumferentially arranged on the outside of each lid.
  • each nozzle of said at least one second plurality of nozzles is angled with respect to the inner perimeter of the grinding chamber.
  • the grinding chamber comprises angle adjusting means to angularly adjust the position of each nozzle with respect to said perimeter.
  • the feeding device to feed the product to be ground into the grinding chamber comprises a Venturi tube able to accelerate the particles of the product entering the grinding chamber up to a speed comprised in the range 20 - 100 m/s.
  • the mill comprises a classifier between the grinding chamber and the cyclone separator; the classifier comprising a head portion adapted to penetrate into said grinding chamber and adjusting means adapted to adjust the penetration value of said head portion into the grinding chamber.
  • the mill comprises at least one cyclonic separator comprising at least one first filter and at least one second filter.
  • the first filter comprises at least one cylindrical bag.
  • said nozzles of said at least one first and at least one second plurality of nozzles are of convergent-divergent type.
  • figure 1 shows a perspective schematic view of a fluid grinding mill according to the present invention
  • figure 2 shows a sectional view of the grinding chamber and the Venturi tube according to the present invention, in a first shape of the grinding chamber;
  • figure 3 shows a sectional view of the grinding chamber and the Venturi tube according to the present invention, in a second shape of the grinding chamber;
  • figure 4 is a sectional view of a portion of the grinding chamber of figure 2 and 3;
  • figure 5 is a sectional view of the grinding chamber and the classifier according to the present invention.
  • figure 6 is a schematic view of an alternative embodiment of a cyclonic separator according to the present invention.
  • a fluid grinding mill according to the present invention is denoted with the numeral reference 100.
  • the fluid grinding mill 100 as shown in figure 1 , comprises a feeding device 2 to feed the product to be ground, a grinding chamber 3 and at least one separating cyclone 4 downstream of the grinding chamber 3 and adapted to separate the ground product obtained in the desired particle size from the fluid carrier.
  • the feeding device 2 to feed the air is a Venturi tube 13 having an inlet 13' for the product to be ground and a second inlet 13 " for the process fluid or fluid carrier.
  • the Venturi tube 13 is connected to the grinding chamber 3.
  • the Venturi tube sucks the material to be ground from a first inlet 13 ', whereas the Venturi tube sucks the process fluid from the second inlet 13 " .
  • the material to be ground is mixed with the process fluid, therefore the process fluid supports the material to be ground as dispersed powder.
  • the Venturi tube 13 is sized for giving to the material to be ground entering the mixing chamber 3 an acceleration in the range from 20 to 100 m/s, depending on the process fluid pressure and the mass of the product to be ground.
  • the Venturi tube 13 is sized for giving to the material to be ground entering the mixing chamber 3 an acceleration in the range from 30 to 60 m/s.
  • the grinding chamber 3 has a substantially cylindrical shape with a diameter D in the range from 18 to 160 mm and an inner height H in the range from 2 to 300 mm.
  • the inner height H of the grinding chamber 3 can vary during the grinding process, as better described in the following.
  • the grinding chamber 3 comprises at least one first plurality of injecting nozzles 5 to inject process fluid into the grinding chamber 3, the process fluid exiting from the nozzles 5 further accelerate the flow of gas and material to be ground that takes a spiral arrangement due to the circular shape of the grinding chamber 3 and to the arrangement and tilt of the nozzles 5.
  • the number of nozzles 5 of the first plurality of nozzles can vary from 2 to 15 depending on the diameter of the first mixing chamber 3.
  • a number of 3 to 8 nozzles could be recommended, on the contrary for a grinding chamber 3 with diameter D in the range from 60 to 100 mm, a number of nozzles from 4 to 10 could be recommended and, lastly, for a grinding chamber 3 with diameter D in the range from 100 to 150 mm a number of nozzles from 4 to 12 could be recommended.
  • the nozzles 5 of the first plurality are angularly spaced out along the inner perimeter of the grinding chamber 3, preferably the nozzles 5 of the first plurality are spaced out at equal angles along the inner perimeter of the grinding chamber 3. In other terms, substantially they are all at the same mutual circumferential distance.
  • Each nozzle 5 of the first plurality is angled or tilted with respect to the inner perimeter of the grinding chamber so that to form an angle a in the range from 3° to 70°, preferably from 5° to 60°.
  • the grinding mill 100 comprises angle adjusting means to angularly adjust the position of each nozzle 5 with respect to the inner perimeter of the grinding chamber 3.
  • the angle adjusting means are such to allow a variation of the angular a in the range from 0 to 45° with respect to the base angle.
  • the base angle a previously fixed for a process is equal to 30°, such an angle will have to be varied during the process or between a process and the following one, for example by adding or subtracting 15° depending on the particle size to be obtained.
  • the adjusting means comprise a toothed ring nut not shown in figure and circumferentially arranged outside of the nozzles 5.
  • the ring nut is engaged with a toothed end of each nozzle 5.
  • the toothed end is a portion of cogwheel.
  • Each nozzle 5 is further pivoted to angularly rotate with respect to the perimeter of the chamber 3.
  • the ring nut can be moved manually or by a mechanical or oleo-pneumatic system.
  • the nozzles 5 of the first plurality of nozzles are nozzles of the convergent- divergent type or "de Laval" nozzles and are supersonic exhaust nozzles.
  • the grinding chamber 3 comprises a second plurality of nozzles 6.
  • the nozzles 6 of the second plurality are angularly spaced out along the inner perimeter of the grinding chamber 3, preferably the nozzles 6 of the second plurality are spaced out at equal angles along the inner perimeter of the mixing chamber 3. In other terms, substantially they are all at the same mutual circumferential distance.
  • the second plurality of nozzles 6 is arranged in said grinding chamber as longitudinally spaced out with respect to the first plurality of nozzles 5.
  • the nozzles 6 are arranged on the same plane being on the right and longitudinally spaced out with respect to the plane containing the nozzles 5 of the first plurality.
  • the second nozzles 6 of the second plurality of nozzles can be of the same amount of the first nozzles 5 of the first plurality of nozzles.
  • the second nozzles 6 can be of higher or lower amount, without departing from the protection scope of the present application.
  • the second nozzles 6 may even not be arranged in a position corresponding to the first nozzles 5.
  • the grinding chamber 3 comprises a third plurality of nozzles.
  • the nozzles of the third plurality are angularly spaced out along the inner perimeter of the grinding chamber 3, preferably the nozzles 7 of the third plurality are spaced out at equal angles along the inner perimeter of the grinding chamber 3.
  • the third plurality of nozzles is arranged in the grinding chamber as longitudinally spaced out with respect to the first and second pluralities of nozzles.
  • the nozzles of the third plurality are all arranged on the same plane.
  • Such a plane is longitudinally spaced out with respect to the plane containing the nozzles 5, 6 of the first and second pluralities.
  • the nozzles of the third plurality of nozzles can be of the same amount of the nozzles 5, 6 of the first and second pluralities of nozzles.
  • the third nozzles can be of higher or lower amount than the nozzles 5 or 6 of the first or second plurality, without departing from the protection scope of the present invention.
  • the nozzles of the third plurality can even not be arranged in a position corresponding to the nozzles 5, 6 of the first or second plurality of nozzles. Additional pluralities of nozzles can be provided, each one spaced out in the longitudinal direction, without departing from the protection scope of the present invention.
  • the nozzles 5, 6 inside the grinding chamber 3 are such that the particles to be ground will reach a speed in the range from 10 m/s to 1800 m/s.
  • the mill 100 comprises selecting means adapted to selectively activate the plurality of nozzles depending on the process and the grinding particle size to be obtained.
  • all the pluralities of nozzles can be in use during the grinding process (in the case shown in figure, both the pluralities of nozzles), or only one or more depending on the process and the grinding particle size to be obtained.
  • the selecting means 9 for selectively controlling the activation of the plurality of nozzles comprise the two opposed lids 14, 15 of the grinding chamber 3.
  • the lids 14, 15 can be in fact moved from a first configuration, in which their mutual distance and consequently the height H of the grinding chamber 3 are such that only the nozzles 5 can put process fluid into the grinding chamber 3 by having a second configuration in which the mutual distance between the two lids 14, 15, or the height H of the grinding chamber 3, is increased so that also the nozzles 6 of the second plurality of nozzles give onto the inside of the grinding chamber 3 thereby being able to put pressurized fluid therein.
  • the movement of the lids 14, 15 would allow selecting a plurality of nozzles, for example a third plurality, with a given angle a of the nozzles or another plurality, for example the second one, with another given angle a or, again, increasing the height H of the inner chamber so that several plurality of nozzles can operate, for example the first and the second pluralities of nozzles or all together, each one with its own angle a.
  • the lids 14, 15 by varying the position of the lids 14, 15 it is possible to translate, increase or decrease the inner volume of the grinding chamber 3 by allowing only one plurality of nozzles, or all the pluralities of nozzles or part of them (for example the second and the third plurality of nozzles), giving onto the inside of the grinding chamber 3.
  • each of them is keyed on a threaded shaft rotated by convenient motor means, the shaft rotation by the motor means causing the translation of at least one lid 14, 15, whereas the rotation in the other shaft way causes the translation of at least one lid 14, 15 in the other way.
  • Two O-rings 19 are provided as sealing elements and circumferentially arranged on the outside of each lid so that sealing is obtained.
  • Each O-ring 19 is therefore positioned between a lid 14, 15 and the side wall of the mixing chamber 3.
  • the grinding chamber 3 is connected via a duct 17 to a cyclone separator 4.
  • the duct 17 leading the ground product supported by the carrier gas to the separating cyclone comprises a classifier 8.
  • the classifier 8 is a tubular element concentrically assembled inside the threaded shaft.
  • the classifier 8 is placed between the grinding chamber 3 and the cyclone separator 4 and has a head portion 8' adapted to penetrate into the grinding chamber 3, as shown in figure 5.
  • the head portion 8' of the classifier is usually circular or inscribable in a circumference.
  • the circumference of the classifier head has a diameter from 5 to 50 mm.
  • the particle residence time inside the grinding chamber 3 increases, thus obtaining further particle collisions that will lead to a further decrease of the particle size.
  • the mill according to the present invention has penetration adjusting means adapted to adjust the penetration value of the head of the classifier 8 into the grinding chamber 3.
  • the penetration adjusting means are adapted to allow varying the penetration depth from 5 to 50 mm and can be of mechanical, hydraulic or pneumatic type.
  • the separating cyclone 4 comprises on top a vent 21 for the carrier gas and, on the bottom, a tank 22 for the collection of the ground product.
  • the cyclone separator 4 comprises at least one first filter 23 and at least one second filter 24.
  • the first filter 23 is an antistatic bag filter and is preferable made of polyester, serving to prevent the ground product now with the desired particle size from dispersing in the environment, instead of falling in the collection tank 22.
  • the first filter has a cylindrical base with a plurality of cylindrical bag 24, which are reciprocally placed side by side and substantially extend vertically from said base.
  • Each bag 24 has a diameter d in the range from 10 to 30 mm.
  • the number of bags can vary from 1 to 20.
  • each bag 24 is comprised in the range from 50 to 200 mm.
  • the second filter 25 is a filter of known type, for example an absolute cartridge filter usually named ULPA, and is for filtering the carrier gas before the dispersion thereof in the environment against possible material particles, with a size lower than 0.2 microns, still dispersed therein.
  • ULPA absolute cartridge filter

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

La présente invention concerne un broyeur à fluide (100) comprenant : au moins un dispositif d'alimentation pour amener le produit à broyer ; au moins une chambre de broyage (3) comprenant un périmètre intérieur, ladite chambre de broyage étant connectée audit dispositif d'alimentation pour recevoir le produit à broyer ; au moins un cyclone de séparation (4) en aval de ladite chambre de broyage (3). L'invention est caractérisée en ce que ladite chambre de broyage (3) comprend : au moins une première pluralité de buses d'injection (5) pour injecter du fluide de traitement dans la chambre de broyage (3), les buses (5) de ladite au moins une première pluralité étant angulairement espacées le long du périmètre intérieur de ladite chambre de broyage (3), chaque buse (5) ayant un angle (a) par rapport audit périmètre intérieur de la chambre de broyage (3) ; au moins une seconde pluralité de buses d'injection pour injecter du fluide de traitement dans la chambre de broyage, les buses de la seconde pluralité étant espacées longitudinalement dans ladite chambre de broyage par rapport aux buses de ladite première pluralité de buses, les buses de ladite au moins une seconde pluralité étant angulairement espacées les unes des autres le long du périmètre intérieur de ladite chambre de broyage ; un moyen de sélection conçu pour activer sélectivement la pluralité de buses devant être actionnée en fonction du procédé et la taille de particule de broyage à obtenir.
PCT/IB2016/051964 2015-04-08 2016-04-07 Broyeur à fluide Ceased WO2016162813A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2015A000502 2015-04-08
ITMI20150502 2015-04-08

Publications (1)

Publication Number Publication Date
WO2016162813A1 true WO2016162813A1 (fr) 2016-10-13

Family

ID=53673173

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/051964 Ceased WO2016162813A1 (fr) 2015-04-08 2016-04-07 Broyeur à fluide

Country Status (1)

Country Link
WO (1) WO2016162813A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5244450A (en) * 1975-10-06 1977-04-07 Nisso Eng Kk Grain size control
US20120037736A1 (en) * 2004-07-09 2012-02-16 Sunrex Kogyo Co., Ltd. Jet mill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5244450A (en) * 1975-10-06 1977-04-07 Nisso Eng Kk Grain size control
US20120037736A1 (en) * 2004-07-09 2012-02-16 Sunrex Kogyo Co., Ltd. Jet mill

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "NANONIZER", 18 December 2014 (2014-12-18), XP055228487, Retrieved from the Internet <URL:https://web.archive.org/web/20141218020758/http://nanonizer.ch/> [retrieved on 20151113] *

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