EP0601511A1 - Procédé et dispositif de brayage à impact pour particules solides - Google Patents

Procédé et dispositif de brayage à impact pour particules solides Download PDF

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Publication number
EP0601511A1
EP0601511A1 EP93119613A EP93119613A EP0601511A1 EP 0601511 A1 EP0601511 A1 EP 0601511A1 EP 93119613 A EP93119613 A EP 93119613A EP 93119613 A EP93119613 A EP 93119613A EP 0601511 A1 EP0601511 A1 EP 0601511A1
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EP
European Patent Office
Prior art keywords
suspension
solid particles
fluid
energy
jet
Prior art date
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Granted
Application number
EP93119613A
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German (de)
English (en)
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EP0601511B1 (fr
Inventor
Roland Dr.-Ing. Nied
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Individual
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Individual
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    • 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

  • EP 0300402 B1 deals with the generation of extremely small particles in such a way that the particles to be comminuted, which already have a relatively small mass, are initially suspended in a fluid and this suspension of fluid with particles suspended therein is brought to impact on a surface, however, measures are provided to increase the impact energy. For this purpose, drop-shaped suspension portions are removed from the suspension, which in turn are caused to impact the surface.
  • This type of impact crushing is based on the consideration that the crushing of particles can only be achieved successfully if the mass of the particles to be broken down does not fall below a certain limit.
  • each droplet consists of a fluid component in which at most a few solid particles are contained.
  • each of these droplets is separated from the other droplets of the same type and the mass of these droplets is in turn entrained by a carrier fluid stream and brought to impact on the impact surface.
  • each solid particle is first made a component of a droplet of greater mass, which causes a much higher energy to impact is brought and due to the increased impact energy so solid particles of extremely small mass can be crushed even further.
  • the first fluid will mostly be a liquid
  • the second fluid ie the carrier fluid
  • the carrier fluid will be a gas.
  • the suspension of liquid and suspended solid particles with only a small mass is contained in a container and a gas stream with high energy is blown into this container and thus into the suspension, which entrains droplets from liquid subsets and solid particles therein and to impact in the manner described brings.
  • the first possibility is largely the technique already described, in which the partial suspension of liquid droplets entrained by a gas stream and the smallest possible number of solid particles contained therein is brought to impingement on a baffle plate.
  • the second possibility is a modification in such a way that several jets of high-energy gas jets directed against each other are blown into the container with the suspension, so that the impact crushing is carried out by means of at least two mutually accelerated subsets of suspensions.
  • the present invention is now based on the consideration that regardless of which of the two options is used, solid particles are already destroyed by the fact that an impact comminution takes place within the or each suspension subset, in that solid particles meet within the respective suspension subset and so mutually smash or disassemble.
  • the reasoning further goes that the possibility of this type of impact crushing within a fluid jet of fluid and solid particles increases with increasing distance from the jet source, because a certain turbulence takes place within the jet, which favors the collision of solid particles, however, that the jet and thus also the energy exchanged between solid particles decreases with increasing distance of the jet from the jet source and that finally in the area of the entry of the carrier fluid into the suspension in the form of an energy-rich jet there are still few solid particles which meet and can smash themselves.
  • the object of the present invention is derived from this, which consists in promoting the impact crushing in the high-energy suspension partial jet over as long a length of the jet as possible, and in particular in the area of the beam source, in particular, to create the possibility for impact crushing of solid particles.
  • a fluid 2 which can be a gas or a liquid (FIG. 1).
  • Solid particles 3 are suspended in this fluid, so that the container 1 receives a suspension 4 of solid particles 3 suspended in a fluid 2.
  • the diameter of a single one of the many solid particles 3 can be between 1 and 5 ⁇ m, but preferably its diameter is already less than 1 ⁇ m.
  • Appropriate manipulation can, but does not have to, coagulate as few solid particles as possible with a certain amount of fluid to form a drop, the diameter of which should be approximately 50 ⁇ m.
  • the fluid 2 can be a gas or a liquid, but that it is preferably a liquid.
  • the fast fluid jets 9, 10 are preferably gas jets without being necessarily and exclusively.
  • the particles 3 are largely broken down by the impact on the rigid impact surface 5.
  • a breakdown of the solid particles into solid particles could also be smaller in the area between the atomizing nozzle 11 and the impact surface 5 Size due to energy exchange between the solid particles takes place and the more the suspension of fluid and solid particles moves away from the atomizer nozzle and approaches the impact surface, because the flow which is completely ordered immediately after the nozzle becomes increasingly disordered, insofar as this is done with regard to the actual one Effect on the baffle is acceptable.
  • the solid particles are broken down exclusively by energy exchange between the solid particles, the problem being particularly evident that an energy exchange can only take place at a certain distance from the nozzles 7,8, where the energy of the gas jets is already has experienced a certain reduction, which is naturally greatest at the nozzle outlet.
  • This is accepted in the state of the art, because there is no thought of an energy exchange between solid particles that exceeds a certain level Distance from the nozzles are incorporated into each of the fast gas jets.
  • the primary idea is to exchange energy between particles that can be assigned to one of the gas jets and particles that can be assigned to the other of the two gas jets.
  • the present invention is concerned precisely with the fact that an energy exchange between solid particles takes place immediately after the emergence of fluid jets from one or more nozzles. For this reason, additional solid particles are fed to the respective fluid jet immediately after leaving the respective nozzle, which come into active connection with the suspension jet emerging from the nozzle and an energy exchange with the solid particles already contained in the suspension jet immediately after leaving the nozzle (FIG. 1) or which enter into an energy exchange with the solid particles which, due to the rapid fluid jets, leave the at least one nozzle 7, 8 (FIG. 2).
  • the additional solid particles can only be made available in various ways, but it is particularly expedient to provide them as parts of a suspension which is removed from the suspension 4 in the area of the nozzles 7, 8 before being introduced.
  • FIG. 3 A mixing nozzle which can be used particularly expediently in the invention is shown in FIG. 3 as a central longitudinal section.
  • a tube 13 Arranged in a housing 12 is a tube 13 which tapers on the outside at one end, which is the nozzle outlet, and whose inner diameter is constant. This tube 13 exits through the outlet end of the housing with a defined radial clearance, but without projecting over a collar-like extension of the housing.
  • a fluid is introduced into the annular space 15 between the tube 13 and the housing 12 via a radial inlet 14, in which granulate is suspended.
  • a blade ring 16 ensures that the suspension leaves the annular space 15 in such a way that it concentrically and uniformly surrounds the fluid stream emerging from the tube 13 and in the process even mixes with the fluid stream from the tube 13, insofar as this fluid stream does not thereby cause substantial energy is withdrawn.
  • the suspension 4 consist of a gas and solid particles or of a liquid with solid particles. It is preferably a suspension of a liquid and solid particles.
  • a gas or a liquid can be brought out of the tube 13 of the nozzle according to FIG. 3. It is preferably a gas.
  • the fluid emerging from the tube 13 is accelerated so that it entrains the suspension introduced into the annular space through the tube 14, accelerates it and conveys the necessary energy to it.
  • the suspension caused to enter the nozzle according to FIG. 3 via the pipe 14 can be a gas or a liquid with solid particles suspended therein. It can be prepared in any way. It is preferably a liquid with solid particles suspended therein. Again, this suspension is preferably removed from container 1 or 6, i.e. is therefore a subset of the suspension 4, which is removed in the container 1 or 6 and returned to the container.
  • a second fluid jet 18 is introduced into the fluid jet 17 leaving the nozzle 11, which in turn consists of a suspension with solid particles suspended in a fluid, the impact crushing in the fluid jet 17 thus takes place to a degree that the impact crushing on the impact surface 5 can be dispensed with, there is a fluidized bed jet mill of high efficiency and low construction costs.
  • the invention has its full effect particularly when the first fluid with the solid particles to be broken down, that is to say in the case of FIG. 2 the suspension 4, already contains a considerable proportion of solid particles with only a low mass, as is the case with modern classifiers. because only extremely fine visible material is intentionally removed from it, i.e. the material returned to the mill still contains a high proportion of relatively finely ground material.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
EP93119613A 1992-12-10 1993-12-06 Procédé et dispositif de brayage à impact pour particules solides Expired - Lifetime EP0601511B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4241549 1992-12-10
DE4241549A DE4241549A1 (de) 1992-12-10 1992-12-10 Verfahren und Vorrichtung für die Prallzerkleinerung von Feststoffpartikeln

Publications (2)

Publication Number Publication Date
EP0601511A1 true EP0601511A1 (fr) 1994-06-15
EP0601511B1 EP0601511B1 (fr) 1998-08-26

Family

ID=6474839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93119613A Expired - Lifetime EP0601511B1 (fr) 1992-12-10 1993-12-06 Procédé et dispositif de brayage à impact pour particules solides

Country Status (4)

Country Link
EP (1) EP0601511B1 (fr)
JP (1) JPH06269693A (fr)
DE (2) DE4241549A1 (fr)
ES (1) ES2121921T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0888818A1 (fr) * 1997-07-03 1999-01-07 HOSOKAWA ALPINE Aktiengesellschaft Procédé et dispositif de broyage à jet à lit fluidisé

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19513035C2 (de) * 1995-04-06 1998-07-30 Nied Roland Fließbett-Strahlmahlung
US7511079B2 (en) * 2003-03-24 2009-03-31 Baxter International Inc. Methods and apparatuses for the comminution and stabilization of small particles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4248387A (en) * 1979-05-09 1981-02-03 Norandy, Inc. Method and apparatus for comminuting material in a re-entrant circulating stream mill
EP0300402B1 (fr) * 1987-07-22 1992-03-04 Roland Dr.-Ing. Nied Procédé de production de particules extrêmement petites et utilisation dudit procédé
EP0488637A2 (fr) * 1990-11-27 1992-06-03 Xerox Corporation Broyeur à jet à lit fluidisé

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU643188A1 (ru) * 1977-04-01 1979-01-25 Уральский ордена Трудового Красного Знамени политехнический институт им. С.М.Кирова Струйна мельница с псевдоожиженным слоем
DE4015605A1 (de) * 1990-05-15 1991-11-21 Nied Roland Verfahren zur erzeugung feinster partikel und vorrichtung zur durchfuehrung des verfahrens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4248387A (en) * 1979-05-09 1981-02-03 Norandy, Inc. Method and apparatus for comminuting material in a re-entrant circulating stream mill
EP0300402B1 (fr) * 1987-07-22 1992-03-04 Roland Dr.-Ing. Nied Procédé de production de particules extrêmement petites et utilisation dudit procédé
EP0488637A2 (fr) * 1990-11-27 1992-06-03 Xerox Corporation Broyeur à jet à lit fluidisé

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0888818A1 (fr) * 1997-07-03 1999-01-07 HOSOKAWA ALPINE Aktiengesellschaft Procédé et dispositif de broyage à jet à lit fluidisé
US5992773A (en) * 1997-07-03 1999-11-30 Hosokawa Alpine Aktiengesellschaft Method for fluidized bed jet mill grinding

Also Published As

Publication number Publication date
ES2121921T3 (es) 1998-12-16
JPH06269693A (ja) 1994-09-27
DE59308927D1 (de) 1998-10-01
DE4241549A1 (de) 1994-06-16
EP0601511B1 (fr) 1998-08-26

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