EP0300402B1 - Procédé de production de particules extrêmement petites et utilisation dudit procédé - Google Patents

Procédé de production de particules extrêmement petites et utilisation dudit procédé Download PDF

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Publication number
EP0300402B1
EP0300402B1 EP88111494A EP88111494A EP0300402B1 EP 0300402 B1 EP0300402 B1 EP 0300402B1 EP 88111494 A EP88111494 A EP 88111494A EP 88111494 A EP88111494 A EP 88111494A EP 0300402 B1 EP0300402 B1 EP 0300402B1
Authority
EP
European Patent Office
Prior art keywords
particles
suspension
liquid
impact
solid 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.)
Expired - Lifetime
Application number
EP88111494A
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German (de)
English (en)
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EP0300402A3 (en
EP0300402A2 (fr
Inventor
Roland Dr.-Ing. Nied
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to AT88111494T priority Critical patent/ATE73015T1/de
Publication of EP0300402A2 publication Critical patent/EP0300402A2/fr
Publication of EP0300402A3 publication Critical patent/EP0300402A3/de
Application granted granted Critical
Publication of EP0300402B1 publication Critical patent/EP0300402B1/fr
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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
    • B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy

Definitions

  • the invention relates to a method according to the preamble of claim 1, i.e. So on a method for achieving extremely small particles down to less than 1 micron by impact crushing using a liquid in which the solid particles to be crushed are suspended in order to be made to impact on a surface and using measures to increase the impact energy, thereby characterized in that drop-shaped suspension portions are removed from the suspension, which in turn are caused to impact.
  • this impact crushing method can only be successfully used in both versions for the crushing of particles if the mass of the particles to be broken down does not fall below a certain limit.
  • the limit below which, due to the too small mass of the particles to be crushed, the application of the method is no longer possible with success, can be defined with the particle size and this again by the size of the diameter with approximately 1-5 ⁇ m, depending on the substance to be crushed or its specific weight.
  • this impact crushing method can only be used successfully if the particles to be crushed have a diameter of about 1-5 ⁇ m and a decomposition of the particles below this range is not expected.
  • the gas flow initially has a flow direction perpendicular to the baffle, ie is directed against the baffle in order to be deflected at the baffle or directly in front of it in a direction parallel to the baffle.
  • the impact surface is the essentially rigid surface in the first process version, in the second process version part of the surface of a solid particle of the countercurrent.
  • the particles maintain the original flow direction perpendicular to the impact surface, hit it and are broken down into smaller particles.
  • the mass of the particles is too small, so essentially their diameter is below about 1-5 ⁇ m, the particles are deflected by the gas flow, in the extreme case they do not arrive at all, but at most with less and for the particles to be comminuted less energy on the baffle. This process is repeated until all particles have the desired fineness.
  • the particles to be comminuted are shot against one another.
  • the beam deflection redirects particles that are too small from the direction of movement originally directed towards one another into a direction of movement parallel to one another. As a result, they no longer meet each other or with too little energy.
  • the gas fraction is an additive necessary to convey solid particles to be comminuted or inevitably mixes into the particle stream
  • the actual stream to be conveyed is a liquid whose quality is not impaired too much by solid components that are too large should be.
  • As a means of crushing the too large solid components are only called high pressure and high speed, with which the fluid stream is brought to impinge on the impact surface.
  • Another category also includes a system and a corresponding device, in which two fluid jets are directed towards one another in order to change the molecular connection within the fluid jets, even if it is not only about the molecular connection within the actual fluid itself, but also about reducing the size of molecular agglomorates of solids in liquids (US-A-4,261,521).
  • the fluid is not temporarily assigned a fluid for the purpose of transporting it for comminution, but rather solid particles are assigned in a fluid that is used, for example, according to the type of fuel, which should not exceed a predetermined size .
  • the comminution of solid particles in the sense of the present invention relates to a known method and an associated device, in which the solid particles to be comminuted are suspended in steam as the preferred elastic fluid (DE-A-2 164 856).
  • the crushing of solid particles is primarily provided in such a way that pressure and speed of the flow are changed in succession by the shaping of a flow channel in such a way that a rapid change between supersonic and subsonic speed takes place and a standing shock wave is generated by which the Particles are guided and thereby exposed to the effects of gravity, which crush the particles. Impact comminution in the sense of the genus to which the present invention belongs is therefore not provided.
  • the object of the invention is to remedy the above-discussed lack of a generic impact crushing and to develop or further develop such an impact crushing method so that the crushing or disintegration of the particles can also be reliably expected if the particles to be crushed are of such a low mass have that this is characterized by a particle diameter of about 1-5 microns or less.
  • a fluid flow is thus formed which has a carrier gas stream in which droplets are suspended, each of which in turn consists of a liquid in the form of droplets and a possibly only a few solid particles enclosed therein.
  • a carrier gas stream in which droplets are suspended, each of which in turn consists of a liquid in the form of droplets and a possibly only a few solid particles enclosed therein.
  • an essentially rigid and solid, preferably flat baffle plate 1 is provided in the usual way in the first method version (FIG. 1).
  • a suspension container 2 is arranged at a predetermined distance in front of the baffle plate 1, in which the solid particles to be comminuted are introduced into water or another suitable liquid and the choice of the introduction technique ensures that liquid and solids form a homogeneous suspension.
  • the solid particles at least partially have a particle size of approximately 1-5 ⁇ m or less, it being immaterial whether particles above this size are present or not, since the invention only deals with the solid particles whose size is in the range of approximately 1-5 ⁇ m or below.
  • the suspension can be removed from the housing at the lower, tapered end.
  • an atomizing part will be a liquid drop in which several solid particles, each of which are extremely small, are incorporated. Each drop will have a mass which, in conjunction with the acceleration which is imparted to it during the atomization process, causes it to strike the front of the baffle plate 1 with an energy such that, despite its low mass, each solid particle is broken down into several even smaller particles. Sprayed-on liquid and comminuted particles are then separated from one another in a suitable manner, whereupon the liquid for reuse, the particles comminuted to sizes well below 1-5 ⁇ m are fed to their intended purpose.
  • the second version of the impact crushing method provides at least two gas nozzles 4, 5 directed against one another in the embodiment according to the invention, from which rapid gas jets 6, 7 are introduced into a container 9 filled with a suspension 8 of liquid and solid particles to be crushed.
  • the fast gas jets take up droplets from the surrounding suspension, which in turn contains several solid particles according to the law of probability.
  • the crushing takes place in the plane of the focal point of the gas jets directed against one another by the collision of the suspension drops or the solid particles located therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Colloid Chemistry (AREA)

Claims (5)

  1. Procédé pour l'obtention d'extrêmement fines particules jusqu'à moins de 1 µm par fragmentation par chocs, avec utilisation d'un fluide dans lequel sont en suspension les particules solides à fragmenter, afin de les amener a l'impact sur une surface, et avec application de dispositions pour accroître l'énergie d'impact, caractérisé en ce que hors de la suspension sont prélevées des quantités partielles de suspension en forme de gouttes qui, pour leur part, sont envoyées à l'impact.
  2. Procédé selon la revendication 1, caractérisé en ce qu'est recherchée une composition de chaque goutte, à partir d'une quantité déterminée de fluide, qui renferme une seule particule solide.
  3. Procédé selon la revendication 1, caractérisé en ce que de la suspension est prélevée une quantité partielle déterminée de suspension, dans la formation des gouttes, la détermination du nombre de particules solides qui sont attribuées à la quantité de liquide d'une goutte étant laissée aux conditions de prélèvement.
  4. Procédé selon au moins l'une des revendications 1 à 3, caractérisé en ce que la fragmentation par chocs est effectuée au moyen d'une plaque dans une large mesure rigide.
  5. Procédé selon au moins l'une des revendications 1 à 3, caractérisé en ce que la fragmentation par chocs est effectuée au moyen d'au moins deux quantités partielles de suspension accélérées l'une contre l'autre.
EP88111494A 1987-07-22 1988-07-15 Procédé de production de particules extrêmement petites et utilisation dudit procédé Expired - Lifetime EP0300402B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88111494T ATE73015T1 (de) 1987-07-22 1988-07-15 Verfahren zur erzeugung extrem kleiner partikel und anwendung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3724297 1987-07-22
DE19873724297 DE3724297A1 (de) 1987-07-22 1987-07-22 Verfahren zur erzeugung extrem kleiner partikel und anwendung des verfahrens

Publications (3)

Publication Number Publication Date
EP0300402A2 EP0300402A2 (fr) 1989-01-25
EP0300402A3 EP0300402A3 (en) 1989-11-29
EP0300402B1 true EP0300402B1 (fr) 1992-03-04

Family

ID=6332144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111494A Expired - Lifetime EP0300402B1 (fr) 1987-07-22 1988-07-15 Procédé de production de particules extrêmement petites et utilisation dudit procédé

Country Status (4)

Country Link
EP (1) EP0300402B1 (fr)
AT (1) ATE73015T1 (fr)
DE (2) DE3724297A1 (fr)
ES (1) ES2029499T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0601511A1 (fr) * 1992-12-10 1994-06-15 Roland Dr.-Ing. Nied Procédé et dispositif de brayage à impact pour particules solides

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4015605A1 (de) * 1990-05-15 1991-11-21 Nied Roland Verfahren zur erzeugung feinster partikel und vorrichtung zur durchfuehrung des verfahrens
DE19641129A1 (de) * 1996-10-05 1998-04-09 Nied Roland Verfahren zum Zerlegen von Feststoffpartikeln in einem Fließbett und Vorrichtung für die Durchführung eines solchen Verfahrens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2164856A1 (de) * 1971-12-27 1973-07-05 Texaco Development Corp Verfahren und vorrichtung zum zerkleinern grober feststoffteilchen mit hilfe von stroemungsenergie
US4619406A (en) * 1976-12-22 1986-10-28 Can-Am Engineering Corporation Hydraulic system and method of improving the working properties thereof
US4261521A (en) * 1980-03-13 1981-04-14 Ashbrook Clifford L Method and apparatus for reducing molecular agglomerate sizes in fluids
DD248296A1 (de) * 1984-10-24 1987-08-05 Guben Chemiefaserwerk Beschleunigungsrotor fuer prallmuehlen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0601511A1 (fr) * 1992-12-10 1994-06-15 Roland Dr.-Ing. Nied Procédé et dispositif de brayage à impact pour particules solides

Also Published As

Publication number Publication date
DE3868746D1 (de) 1992-04-09
EP0300402A3 (en) 1989-11-29
DE3724297A1 (de) 1989-02-02
ES2029499T3 (es) 1992-08-16
EP0300402A2 (fr) 1989-01-25
ATE73015T1 (de) 1992-03-15

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