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EP0888818A1 - Method and device for fluidized-bed jet milling - Google Patents

Method and device for fluidized-bed jet milling Download PDF

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Publication number
EP0888818A1
EP0888818A1 EP98110759A EP98110759A EP0888818A1 EP 0888818 A1 EP0888818 A1 EP 0888818A1 EP 98110759 A EP98110759 A EP 98110759A EP 98110759 A EP98110759 A EP 98110759A EP 0888818 A1 EP0888818 A1 EP 0888818A1
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EP
European Patent Office
Prior art keywords
gas
steam
jet
regrind
bed
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.)
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EP98110759A
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German (de)
French (fr)
Inventor
Dieter Dr.-Ing. Schwechten
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Hosokawa Alpine AG
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Hosokawa Alpine AG
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Publication date
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Publication of EP0888818A1 publication Critical patent/EP0888818A1/en
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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
    • B02C19/068—Jet mills of the fluidised-bed type

Definitions

  • the invention relates to the process of fluidized bed jet grinding, in which a high velocity gas or steam jet emerging from a nozzle in a fluidized bed of granular material is introduced.
  • the particles in the The area around the beam is at such a high speed accelerates that when impacting on resting or flying particles burst.
  • Such a method is e.g. already through DE-PS 5 98 421 known.
  • the solution there provides for the pulse exchange between gas or Steam jet and the granular material improve by using in the areas low jet pulse immediately after the jet emerges from the nozzle Flow channels are created transversely to the direction of flow of the jet have a pressure gradient from the environment to the core region of the jet, so that the particles of the ground material are sucked up to the blasting center and then on the impact speed required for their comminution are accelerated.
  • a disadvantage of the known methods is that the particles of the millbase initially have a low kinetic energy and only through the gas or Steam jet of high kinetic energy can be accelerated. Do this due to the inertia of the particles large differential speeds between the Gas or steam jet and the particles of the regrind that have not yet been accelerated on. A high slip is to be expected with particle acceleration, the turbulent flow losses. These are flow losses based on economical, inexpensive shredding with as much as possible low energy consumption is a disadvantage.
  • Remedy is the alignment of a particle beam against a solid obstacle (Target). This ensures that every accelerated particle collides is exposed.
  • a method is described in DE 27 38 980 A1 described.
  • the disadvantage here is the high wear on the fixed baffle plate (target).
  • the essence of the invention is thus to take advantage of particle acceleration Jet pipes (low turbulent flow losses) for efficient and make wear-free shredding usable in fluid bed jet mills.
  • the invention is therefore based on the task of reducing the efficiency of the comminution to increase the jet grinding in the fluidized bed in that the turbulent Flow losses due to the large differential speeds between the Gas or steam jet and the particles of the regrind are minimized. So flow losses should be as small as possible despite high particle loading Gas or steam jets can be realized.
  • the object is achieved in that the gas or steam jets accelerated together with a part of the ground material to be ground and into one fluidized bed of regrind can be introduced.
  • a beam optimally loaded in the manner according to the invention can exit interact with the surrounding fluid bed from the nozzle. This Interaction with the surrounding fluid bed in the form of particle collisions and a further entry of particles into the beam occurs below lower flow losses and leads to better energy utilization of the particle beam.
  • the particles accelerated with little energy expenditure can one be subjected to intimate impact loads in the fluidized bed. Take it all particles, both particles of the acceleration from the jet pipes, as well accelerated particles from the fluidized bed participate in the crushing.
  • An advantageous variant of the invention provides the use of parts of the Grist from the lower part of the fluid bed of the jet mill as feed Particle acceleration together with the gas or steam jet. This is particularly cheap, because of the classifying effect of the fluid bed, there especially coarse and / or heavy particles. Such heavy ones Particles are insufficient in one within the fluid bed jet mill Feeding in and accelerating free jet should therefore be preferred accelerated together with the gas or steam jet.
  • FIG. 1 shows a preferred embodiment of a plant for carrying out the method according to the invention and is described in more detail below.
  • the regrind to be crushed is added to task 1 .
  • the ground material can optionally consist of fresh feed material, which are made through hopper 2 and the feed screw 3 is added at a controlled rate or coarse material, that the fluidized-bed counter jet mill 5 is withdrawn from the lower part of the fluidized bed. 4
  • fresh feed material and recycled regrind from the fluidized bed 4 can be mixed and fed in variable proportions.
  • the ratio of the addition quantities via the metering screw 3 and screw conveyor 6 is regulated by the mutually independent motors 7 and 8, which can be controlled in terms of their speed.
  • the regrind in the feed 1 is fed to the pressure chamber 11 via a lock system consisting of the pressure-tight slides 9 and 10 and the lock chamber 22 .
  • the lock chamber 22 is subject to a pressure swing operation via the controllable valves 23 and 24 of the pressure connection 21 and the expansion line 20th
  • An overpressure screw conveyor 12 serves as a conveying device for the feed material within the pressure range and, by regulating the screw speed via the motor 13, enables the proportion of the regrind to be metered into the gas or steam flow.
  • the loading ratio is in the range of 0.5 to 5.0 kg of regrind per kg of gas or steam mass flow.
  • the ground material which is introduced via the grinding gas inlet 17 and is under pressure is dispersed in the grinding gas or grinding steam in the mixing chamber 14 and fed to the fluidized bed counter-jet mill 5 via the jet pipes 15 .
  • the particle-laden high-pressure jet is expanded into the fluidized bed counter-jet mill 5 through the nozzles 16 directly into the fluidized bed 4 .
  • the fines produced during comminution leave the mill and the circuit via the fines outlet 18 of the classifier 19 .

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

Abstract

The method works by injecting a high-speed gas or steam jet into a fluidized bed of the material to be ground. The gas/steam jet together with part of the material, are accelerated and introduced into the fluidized bed. A further part of the material is added to jet after it has left the nozzle. Acceleration of jet and material takes place in jet pipes. Gas or steam jets are relieved to a pressure below ambient pressure. The method uses two or more gas/steam jets, which are directed opposite to each other and meet in a common point within the fluidized material bed.

Description

Die Erfindung bezieht sich auf das Verfahren der Fließbett-Strahlmahlung, bei dem ein aus einer Düse austretender Gas- oder Dampfstrahl hoher Geschwindigkeit in ein fluidisiertes Bett aus körnigem Material eingeleitet wird. Die Partikel in der Umgebung des Strahls werden dabei auf eine so hohe Geschwindigkeit beschleunigt, daß sie beim Aufprallen auf ruhende oder entgegenfliegende Partikel zerbersten. Ein solches Verfahren ist z.B. bereits schon durch die DE-PS 5 98 421 bekannt geworden.The invention relates to the process of fluidized bed jet grinding, in which a high velocity gas or steam jet emerging from a nozzle in a fluidized bed of granular material is introduced. The particles in the The area around the beam is at such a high speed accelerates that when impacting on resting or flying particles burst. Such a method is e.g. already through DE-PS 5 98 421 known.

Neuere Entwicklungen an Fließbett-Strahlmühlen sind darauf gerichtet, die in das Fließbett eintretenden Fluidstrahlen besser mit Partikeln beladen zu können.More recent developments on fluid bed jet mills are aimed at that in the Fluid jets entering fluid bed can be better loaded with particles.

Verbesserungswürdig bei den Verfahren nach dem Stand der Technik ist der Impulsaustausch zwischen den schnellen Gas- oder Dampfstrahlen hoher kinetischer Energie und dem körnigen, nahezu ruhenden Material mit niedriger kinetischer Energie im Fließbett.There is room for improvement in the state-of-the-art processes Exchange of momentum between the fast gas or steam jets higher kinetic energy and the granular, almost resting material with lower kinetic energy in the fluidized bed.

So findet ein Impulsaustausch zwischen Gas- oder Dampfstrahl und dem körnigen Material fast ausschließlich im Mantelbereich der Gas- oder Dampfstrahlen statt. Die Partikelgeschwindigkeiten quer zur Strömungsrichtung reichen nicht aus, um in das Innere der Gasstrahlen vorzudringen. Als Folge davon bleiben die hohen Gasgeschwindigkeiten im Kern des Strahls weitgehend ungenutzt zur Zerkleinerung.An exchange of impulses takes place between the gas or steam jet and the granular one Material takes place almost exclusively in the jacket area of the gas or steam jets. The particle velocities transverse to the direction of flow are not sufficient to in to penetrate the interior of the gas jets. As a result, the high remain Gas velocities in the core of the beam are largely unused Crushing.

Eine erste Lösung dieses Problems ist durch die DE 42 43 438 C2 bekannt geworden, die es sich zum Ziel gemacht hat eine bessere Nutzung der mit dem Strahl eingebrachten Energie dadurch zu erreichen, daß die Beladung der für die Mahlung im Fließbett eingesetzten Gas- oder Dampfstrahlen mit dem zu zerkleinernden Material erhöht wird. A first solution to this problem is known from DE 42 43 438 C2 which has made it its goal to make better use of the Achieving the energy introduced by the loading of the for the Grinding in the fluid bed used gas or steam jets with the crushing material is increased.

Die dortige Lösung sieht vor, den Impulsaustausch zwischen Gas- oder Dampfstrahl und dem körnigen Material zu verbessern, indem in den Bereichen mit niedrigem Strahlimpuls unmittelbar nach Austritt des Strahls aus der Düse Strömungskanäle quer zur Strömungsrichtung des Strahls geschaffen werden, die ein Druckgefälle von der Umgebung zum Kernbereich des Strahls aufweisen, so daß die Partikel des Mahlgutes bis zum Strahlzentrum eingesaugt und dann auf die für ihre Zerkleinerung erforderliche Prallgeschwindigkeit beschleunigt werden.The solution there provides for the pulse exchange between gas or Steam jet and the granular material improve by using in the areas low jet pulse immediately after the jet emerges from the nozzle Flow channels are created transversely to the direction of flow of the jet have a pressure gradient from the environment to the core region of the jet, so that the particles of the ground material are sucked up to the blasting center and then on the impact speed required for their comminution are accelerated.

Nachteilig bei den bekannten Verfahren ist jedoch, daß die Partikel des Mahlgutes zunächst eine geringe kinetische Energie aufweisen und erst durch den Gas- oder Dampfstrahl hoher kinetischer Energie beschleunigt werden. Dabei treten aufgrund der Massenträgheit der Partikel große Differenzgeschwindigkeiten zwischen dem Gas- oder Dampfstrahl und den noch nicht beschleunigten Partikeln des Mahlgutes auf. Bei der Partikelbeschleunigung ist also ein hoher Schlupf zu erwarten, der turbulente Strömungsverluste zur Folge hat. Diese Strömungsverluste sind bezogen auf eine wirtschaftliche, kostengünstige Zerkleinerung mit möglichst geringem Energieaufwand von Nachteil.A disadvantage of the known methods, however, is that the particles of the millbase initially have a low kinetic energy and only through the gas or Steam jet of high kinetic energy can be accelerated. Do this due to the inertia of the particles large differential speeds between the Gas or steam jet and the particles of the regrind that have not yet been accelerated on. A high slip is to be expected with particle acceleration, the turbulent flow losses. These are flow losses based on economical, inexpensive shredding with as much as possible low energy consumption is a disadvantage.

Die Beschleunigung von Partikeln zusammen mit dem Fluid ist somit besonders effizient. Dieser Effekt wird auch in Gegenstrahlmühlen mit Strahlrohren genutzt. Aus der DE 36 20 440 A1 ist ein derartiges Verfahren bekannt, bei dem das zu zerkleinernde Schüttgut in ein Druckausblasgehäuse eingeführt wird und dann zusammen mit dem vorverdichtetem Fördergas in eine Förderleitung hinein entspannt und beschleunigt wird. Bei diesem Verfahren werden jeweils zwei Strahldüsen gegeneinander gerichtet betrieben. Die Zerkleinerung der Partikel erfolgt dabei durch gegenseitige Prallzerkleinerung der kollidierenden Partikel. Nachteilig ist hierbei, daß der Mahleffekt nur gering ist, da jedes Partikel nur einer einmaligen Zerkleinerung ausgesetzt ist. Viele Partikel werden nicht zerkleinert, da sie von dem entgegengesetzt gerichtetem Strahl aus der Zerkleinerungszone im Zentrum des Strahls nach außen hin abgelegt werden und nicht mit anderen Partikeln aus der Strahlumgebung kollidieren können. The acceleration of particles together with the fluid is therefore special efficient. This effect is also used in counter jet mills with jet pipes. From DE 36 20 440 A1, such a method is known, in which the crushing bulk material is inserted into a pressure blow-out housing and then together with the pre-compressed production gas into a delivery line is relaxed and accelerated. With this procedure, two are used Jet nozzles operated against each other. The crushing of the particles takes place by mutual impact crushing of the colliding particles. The disadvantage here is that the grinding effect is only slight, since each particle is only one single crushing is exposed. Many particles are not crushed because it from the oppositely directed jet from the comminution zone in the Center of the beam to the outside and not with others Particles from the beam environment can collide.

Abhilfe schafft die Ausrichtung eines Partikelstrahls gegen ein festes Hindernis (Target). So ist sichergestellt, daß jedes beschleunigte Partikel einer Kollision ausgesetzt wird. Ein derartiges Verfahren wird in der DE 27 38 980 A1 beschrieben. Nachteilig ist hierbei jedoch der hohe Verschleiß an der feststehenden Prallplatte (Target).Remedy is the alignment of a particle beam against a solid obstacle (Target). This ensures that every accelerated particle collides is exposed. Such a method is described in DE 27 38 980 A1 described. The disadvantage here is the high wear on the fixed baffle plate (target).

Kern der Erfindung ist es somit, die Vorteile der Partikelbeschleunigung in Strahlrohren (geringe turbulente Strömungsverluste ) für die effiziente und verschleißfreie Zerkleinerung in Fließbett-Strahlmühlen nutzbar zu machen.The essence of the invention is thus to take advantage of particle acceleration Jet pipes (low turbulent flow losses) for efficient and make wear-free shredding usable in fluid bed jet mills.

Der Erfindung liegt daher die Aufgabe zugrunde, die Effizienz der Zerkleinerung bei der Strahlmahlung im Fließbett dadurch zu erhöhen, daß die turbulenten Strömungsverluste aufgrund der großen Differenzgeschwindigkeiten zwischen dem Gas- oder Dampfstrahl und den Partikeln des Mahlgutes minimiert werden. So sollen möglichst kleine Strömungsverluste trotz hoher Partikelbeladung der Gas- oder Dampfstrahlen realisiert werden.The invention is therefore based on the task of reducing the efficiency of the comminution to increase the jet grinding in the fluidized bed in that the turbulent Flow losses due to the large differential speeds between the Gas or steam jet and the particles of the regrind are minimized. So flow losses should be as small as possible despite high particle loading Gas or steam jets can be realized.

Die Lösung der Aufgabe wird dadurch erreicht, daß die Gas- oder Dampfstrahlen zusammen mit einem Teil des zu zerkleinernden Mahlgutes beschleunigt und in ein fluidisiertes Mahlgutbett eingeleitet werden.The object is achieved in that the gas or steam jets accelerated together with a part of the ground material to be ground and into one fluidized bed of regrind can be introduced.

Ein in der erfindungsgemäßen Weise optimal beladener Strahl kann nach Austritt aus der Düse in Wechselwirkung mit dem umgebenden Fließbett treten. Diese Wechselwirkung mit dem umgebenden Fließbett in Form von Partikelkollisionen und einem weiteren Einzug von Partikeln in den Strahl geschieht dabei unter geringeren Strömungsverlusten und führt zu einer besseren Energieausnutzung des Partikelstrahls.A beam optimally loaded in the manner according to the invention can exit interact with the surrounding fluid bed from the nozzle. This Interaction with the surrounding fluid bed in the form of particle collisions and a further entry of particles into the beam occurs below lower flow losses and leads to better energy utilization of the particle beam.

Die mit geringem energetischem Aufwand beschleunigten Partikel können einer innigen Prallbeanspruchung im Fließbett ausgesetzt werden. Dabei nehmen sämtliche Partikel, sowohl Partikel der Beschleunigung aus den Strahlrohren, sowie beschleunigte Partikel aus dem Fließbett an der Zerkleinerung teil. The particles accelerated with little energy expenditure can one be subjected to intimate impact loads in the fluidized bed. Take it all particles, both particles of the acceleration from the jet pipes, as well accelerated particles from the fluidized bed participate in the crushing.

Eine vorteilhafte Variante der Erfindung sieht die Verwendung von Teilen des Mahlgutes aus dem unteren Teil des Fließbetts der Strahlmühle als Aufgabegut zur Partikelbeschleunigung zusammen mit dem Gas- oder Dampfstrahl vor. Dies ist besonders günstig, da sich infolge der klassierenden Wirkung des Fließbettes, dort insbesondere grobe und/oder schwere Partikel aufhalten. Gerade solch schwere Partikel sind nur unzureichend innerhalb der Fließbett-Strahlmühle in einen Freistrahl einzuziehen und zu beschleunigen und sollten daher bevorzugt zusammen mit dem Gas- oder Dampfstrahl beschleunigt werden.An advantageous variant of the invention provides the use of parts of the Grist from the lower part of the fluid bed of the jet mill as feed Particle acceleration together with the gas or steam jet. This is particularly cheap, because of the classifying effect of the fluid bed, there especially coarse and / or heavy particles. Such heavy ones Particles are insufficient in one within the fluid bed jet mill Feeding in and accelerating free jet should therefore be preferred accelerated together with the gas or steam jet.

In Fig. 1 ist eine bevorzugte Ausgestaltung einer Anlage zur Durchführung des erfindungsgemäßen Verfahrens dargestellt und wird folgend näher beschrieben. 1 shows a preferred embodiment of a plant for carrying out the method according to the invention and is described in more detail below.

Das zu zerkleinernde Mahlgut wird der Gutaufgabe 1 zugegeben. Das Mahlgut kann wahlweise aus frischem Aufgabegut bestehen, das über Trichter 2 und die Dosierschnecke 3 in geregelter Menge zugegeben wird oder aus Grobgut bestehen, daß aus dem unteren Teil des Fließbettes 4 der Fließbettgegenstrahlmühle 5 abgezogen wird.The regrind to be crushed is added to task 1 . The ground material can optionally consist of fresh feed material, which are made through hopper 2 and the feed screw 3 is added at a controlled rate or coarse material, that the fluidized-bed counter jet mill 5 is withdrawn from the lower part of the fluidized bed. 4

Die Partikel aus dem Fließbett 4 werden in einer geregelten Menge durch eine Förderschnecke 6 aus dem Fließbett 4 ausgetragen. Je nach Anforderung können frisches Aufgabegut und zurückgeführtes Mahlgut aus dem Fließbett 4 in variablen Anteilen gemischt und zugeführt werden. Die Regelung des Verhältnisses der Zugabemengen über die Dosierschnecke 3 und Förderschnecke 6 erfolgt durch die voneinander unabhängigen in ihrer Drehzahl steuerbaren Motoren 7 und 8.The particles from the fluidized bed 4 to be discharged at a controlled rate by a feed screw 6 from the fluidized bed. 4 Depending on requirements, fresh feed material and recycled regrind from the fluidized bed 4 can be mixed and fed in variable proportions. The ratio of the addition quantities via the metering screw 3 and screw conveyor 6 is regulated by the mutually independent motors 7 and 8, which can be controlled in terms of their speed.

Das in der Gutaufgabe 1 befindliche Mahlgut wird über ein Schleusensystem, bestehend aus den druckdichten Schiebern 9 und 10 und der Schleusenkammer 22, der Druckkammer 11 zugeführt. Die Schleusenkammer 22 unterliegt einem Druckwechselbetrieb über die ansteuerbaren Ventile 23 und 24 des Druckanschluß 21 und der Entspannungsleitung 20. The regrind in the feed 1 is fed to the pressure chamber 11 via a lock system consisting of the pressure-tight slides 9 and 10 and the lock chamber 22 . The lock chamber 22 is subject to a pressure swing operation via the controllable valves 23 and 24 of the pressure connection 21 and the expansion line 20th

Eine Überdruck-Förderschnecke 12 dient als Fördereinrichtung für das Aufgabegut innerhalb des Druckbereiches und ermöglicht durch Regelung der Schneckendrehzahl über den Motor 13 die Dosierung des Mahlgutanteils zum Gas- oder Dampfstrom. Das Beladungsverhältnis liegt dabei im Bereich von 0,5 bis 5,0 kg Mahlgutstrom je kg Gas- oder Dampfmassenstrom.An overpressure screw conveyor 12 serves as a conveying device for the feed material within the pressure range and, by regulating the screw speed via the motor 13, enables the proportion of the regrind to be metered into the gas or steam flow. The loading ratio is in the range of 0.5 to 5.0 kg of regrind per kg of gas or steam mass flow.

Das über den Mahlgaseintritt 17 eingeführte und unter Druck stehende Mahlgut wird im Mischraum 14 in dem Mahlgas oder Mahldampf dispergiert und über die Strahlrohre 15 der Fließbett-Gegenstrahlmühle 5 zugeführt. Die Entspannung des partikelbeladenen Hochdruckstrahls in die Fließbett-Gegenstrahlmühle 5 erfolgt durch die Düsen 16 direkt in das Fließbett 4. Das bei der Zerkleinerung entstehende Feingut verläßt die Mühle und den Kreislauf über den Feingutaustritt 18 des Sichters 19. The ground material which is introduced via the grinding gas inlet 17 and is under pressure is dispersed in the grinding gas or grinding steam in the mixing chamber 14 and fed to the fluidized bed counter-jet mill 5 via the jet pipes 15 . The particle-laden high-pressure jet is expanded into the fluidized bed counter-jet mill 5 through the nozzles 16 directly into the fluidized bed 4 . The fines produced during comminution leave the mill and the circuit via the fines outlet 18 of the classifier 19 .

Bezugszeichenliste:Reference symbol list:

(1)(1)
GutaufgabeGood job
(2)(2)
Trichterfunnel
(3)(3)
DosierschneckeDosing screw
(4)(4)
FließbettFluid bed
(5)(5)
FießbettgegenstrahlmühleFluid bed counter jet mill
(6)(6)
FörderschneckeAuger
(7)(7)
Motor der DosierschneckeDosing screw motor
(8)(8th)
Motor der FörderschneckeScrew conveyor motor
(9)(9)
oberer Schieberupper slider
(10)(10)
unterer Schieberlower slider
(11)(11)
DruckkammerPressure chamber
(12)(12)
Überdruck-FörderschneckeOverpressure screw conveyor
(13)(13)
Motor der Überdruck-FörderschneckeOverpressure screw conveyor motor
(14)(14)
MischraumMixing room
(15)(15)
StrahlrohreRadiant tubes
(16)(16)
DüsenNozzles
(17)(17)
MahlluftzufuhrGrinding air supply
(18)(18)
FeingutaustrittFines exit
(19)(19)
SichterClassifier
(20)(20)
EntspannungsleitungRelaxation line
(21)(21)
DruckleitungPressure line
(22)(22)
SchleusenkammerLock chamber
(23)(23)
Ventil der EntspannungsleitungPressure relief valve
(24)(24)
Ventil der DruckleitungPressure line valve

Claims (15)

Verfahren zur Prallzerkleinerung durch Einleiten zumindest eines aus einer Düse austretenden Gas- oder Dampfstrahls hoher Geschwindigkeit in ein fluidisiertes Mahlgutbett, dadurch gekennzeichnet, daß der Gas- oder Dampfstrahl zusammen mit einem Teil des Mahlgutes beschleunigt und in das fluidisierte Mahlgutbett eingeleitet wird.Process for impact crushing by introducing at least one high-speed gas or steam jet emerging from a nozzle into a fluidized mill bed, characterized in that the gas or steam jet is accelerated together with a part of the mill bed and is introduced into the fluidized mill bed. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Gas- oder Dampfstrahl nach dem Austreten aus der Düse mit einem weiteren Teil des Mahlgutes beladen wird.A method according to claim 1, characterized in that the gas or Steam jet after exiting the nozzle with another part of the Grist is loaded. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der Gas- oder Dampfstrahl nach dem Austreten aus der Düse mit einem Teil des Mahlgutes aus dem fluidisiertem Mahlgutbett beladen wird.A method according to claim 2, characterized in that the gas or Steam jet after exiting the nozzle with part of the regrind is loaded into the fluidized regrind bed. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Gas- oder Dampfstrahl zusammen mit einem Teil des Mahlgutes in Strahlrohren beschleunigt wird.Method according to one of claims 1 to 3, characterized in that the Gas or steam jet together with part of the ground material in jet pipes is accelerated. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Gas- oder Dampfstrahlen auf einen Gasdruck unterhalb des Umgebungsdruckes entspannt werden.Method according to one of claims 1 to 4, characterized in that the Gas or steam jets at a gas pressure below the ambient pressure be relaxed. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mindestens zwei Gas- oder Dampfstrahlen gegeneinander gerichtet sind.Method according to one of claims 1 to 5, characterized in that at least two gas or steam jets are directed towards each other. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß sich die Gas- oder Dampfstrahlen in einem gemeinsamen Punkt treffen.A method according to claim 6, characterized in that the gas or Hit steam jets at a common point. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß sich der gemeinsame Punkt innerhalb des Mahlgutbettes befindet.A method according to claim 7, characterized in that the common Point is located inside the regrind bed. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß mit Mahlgut beschleunigte Gas- oder Dampfstrahlen mit Gas- oder Dampfstrahlen kombiniert werden, die ohne Mahlgut beschleunigt sind. Method according to one of claims 1 to 8, characterized in that with Regrind accelerated gas or steam jets with gas or steam jets can be combined, which are accelerated without regrind. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß als Mahlgut für die Beschleunigung zusammen mit den Gas- oder Dampfstrahlen Mahlgut herangezogen wird, das aus dem fluidisiertem Mahlgutbett entnommen wurde.Method according to one of claims 1 to 9, characterized in that as Grist for acceleration together with the gas or steam jets Grist is used, which is removed from the fluidized grist bed has been. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß das Mahlgut an der tiefsten Stelle des fluidisierten Mahlgutbettes entnommen wird.A method according to claim 10, characterized in that the ground material on the lowest point of the fluidized regrind bed is removed. Vorrichtung zur Durchführung des Verfahren nach den Ansprüchen 1 bis 11, gekennzeichnet durch eine flachzylindrische Mischkammer, in der der Mahlgutstrom und der Gas- oder Dampfstrom zusammengeführt und gemischt werden.Device for carrying out the method according to claims 1 to 11, characterized by a flat cylindrical mixing chamber in which the The regrind stream and the gas or steam stream are brought together and mixed become. Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, daß die flachzylindrische Mischkammer mehrere Auslässe zur Verteilung des Gas- oder Dampfstroms auf mindestens zwei Strahlrohre aufweist.Apparatus according to claim 12, characterized in that the flat cylindrical mixing chamber several outlets to distribute the gas or Has steam flow on at least two jet pipes. Vorrichtung nach mindestens einem der Ansprüche 1 bis 13, gekennzeichnet durch eine oder mehrere, der Mischkammer nachgeschaltet flachzylindrische Verteilerkammern, zur Verteilung des Mahlgutstromes zusammen mit dem Gas- oder Dampfstrom auf mehrere Strahlrohre.Device according to at least one of claims 1 to 13, characterized through one or more flat cylindrical downstream of the mixing chamber Distribution chambers, for distribution of the regrind together with the Gas or steam flow on several jet pipes. Vorrichtung nach mindestens einem der Ansprüche 1 bis 14, gekennzeichnet durch ein Schleusensystem, das das Mahlgut in den Druckbereich einschleust.Device according to at least one of claims 1 to 14, characterized through a lock system that injects the regrind into the pressure area.
EP98110759A 1997-07-03 1998-06-12 Method and device for fluidized-bed jet milling Withdrawn EP0888818A1 (en)

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JPH1170340A (en) 1999-03-16

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