EP0603602B1 - Procédé et appareil de broyage à jet à lit fluidisé - Google Patents

Procédé et appareil de broyage à jet à lit fluidisé Download PDF

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Publication number
EP0603602B1
EP0603602B1 EP93119416A EP93119416A EP0603602B1 EP 0603602 B1 EP0603602 B1 EP 0603602B1 EP 93119416 A EP93119416 A EP 93119416A EP 93119416 A EP93119416 A EP 93119416A EP 0603602 B1 EP0603602 B1 EP 0603602B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
jet
section
cross
process according
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
EP93119416A
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German (de)
English (en)
Other versions
EP0603602A1 (fr
Inventor
Stefano Dipl.-Ing. Zampini (Fh)
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.)
Hosokawa Alpine AG
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Hosokawa Alpine AG
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Publication date
Application filed by Hosokawa Alpine AG filed Critical Hosokawa Alpine AG
Publication of EP0603602A1 publication Critical patent/EP0603602A1/fr
Application granted granted Critical
Publication of EP0603602B1 publication Critical patent/EP0603602B1/fr
Anticipated expiration legal-status Critical
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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
    • B02C19/06—Jet mills

Definitions

  • the invention relates to the process of so-called fluidized bed jet milling, in which a gas or steam jet emerging from a nozzle is introduced at high speed into a fluidized bed made of granular material.
  • the particles in the vicinity of the jet are accelerated to such a high speed that they burst upon impact with resting or flying particles.
  • Such a method which is particularly suitable for fine grinding, is e.g. already known from DE-PS 598 421.
  • a disadvantage of the known method is that the kinetic energy introduced by the jet is only partially used for comminution.
  • the jet enters the material bed 3 with a uniform velocity distribution 2 over the outlet cross section 1. Because of the negative pressure in the jet compared to the material bed, particles 4 are immediately sucked into the jet and accelerated from the material bed. This is made clear by the increasing distance between two particles 4. As could be determined, such an exchange of impulses only takes place in the outer edge region of the beam, for example between lines 5 and 6, which are to be thought of as surface lines of the edge region.
  • the jet speed also decreases significantly as the jet progresses, as can be seen from the speed distributions 2a, 2b and 2c in the beam cross sections 1a, 1b and 1c.
  • the core area 7 of the beam remains practically free of regrind, so that the kinetic beam energy remains largely unused in this area and this results in an unsatisfactory efficiency in the comminution.
  • the invention is therefore based on the object of increasing the loading of the gas or steam jets used for grinding in the fluidized bed with the material to be comminuted, so as to improve it To achieve utilization of the kinetic energy introduced with the rays.
  • a possibility is to be created to bring the regrind into the core area of the beams in order to be able to optimally use the kinetic energy available here.
  • the solution to the problem is that in the case of a high-speed gas or steam jet introduced for impact crushing in a fluidized mill bed, the size of the jet pulse is changed locally while maintaining the size of the outlet cross section of the known nozzle, so that zones with high and low jet pulses are formed. and that they are arranged such that the size of the jet pulse in the peripheral region of the outlet cross section changes at least twice between a minimum and a maximum value and in the core region of the cross section is equal to or less than the minimum values.
  • FIG. 2 schematically shows a perspective representation of the flow conditions at the outlet cross section 10 and in the beam cross section 11c, in which a normal speed distribution has already been established as in the beam cross section 1c of FIG. 1.
  • the suction effect to the core area is optimal.
  • FIG. 3 shows the flow conditions as they occur in the plane 13, which is placed in the central nozzle axis 9 and in the middle between two outlet openings 8, which are shown in FIG. 3.
  • 8 radially directed flow channels are formed directly at the outlet cross section 10 between two outlet openings, which flow channels extend in the jet direction up to the jet cross section 11 (with speed distribution 12), in which the individual jet areas begin to overlap.
  • 3 shows the speed distributions 12a, 12b and 12c in the beam cross sections 11a, 11b and 11c.
  • the arrows 14 in FIG. 2 indicate the transverse flow which forms as a result of the flow channels described above and which transports the particles 4 to the central nozzle axis 9.
  • Comparative grinding on a fluidized bed counter jet mill which was initially equipped with normal and then with nozzle elements designed according to the invention, has shown that with otherwise the same operating parameters and approximately the same specific energy requirement (in kWh / t), the mill equipped according to the invention with the same grinding fineness more than that double throughput compared to the normally equipped mill could be achieved, ie the grinding efficiency could be improved by a factor of almost 2.5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (11)

  1. Procédé de broyage par impact de matiére dans un lit fluidisé, par introduction d'au moins un jet de gaz ou de vapeur provenant d'une buse et ayant une grande vitesse, le jet dont la section est composée d'un centre et d'une périphérie circonférentielle entourant ce dernier, caractérisé en ce que le jet de gaz ou de vapeur possède une impulsion qui, dans la périphérie circonférentielle, change au moins deux fois d'une valeur minimale à une valeur maximale dès la sortie de la buse, et correspond dans le centre du jet au plus à la valeur minimale de l'impulsion.
  2. Procédé selon la revendication 1, caractérisé en ce que la valeur de l'impulsion, aux endroits de son minimum, soit nulle.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'impulsion des tous les secteurs de la section du jet à la sortie de la buse possèdent les uns à peu près la même valeur minimale et les autres à peu près la même valeur maximale.
  4. Procédé selon une des revendications 1 à 3, caractérisé en ce que la transition de l'impulsion du jet d'une valeur minimale à une valeur maximale soit discontinu.
  5. Procédé selon une des revendications 1 à 4, caractérisé en ce que le flux à la sortie de la buse, dans tous les secteurs de la section du jet, soit parallèle à l'axe central (9) de la buse.
  6. Procédé selon une des revendications 1 à 4, caractérisé en ce que le flux à la sortie de la buse, dans tous les secteurs de la section du jet, s'éloigne de l'axe central (9) de la buse.
  7. Procédé selon une des revendications 1 à 4, caractérisé en ce que le flux à la sortie de la buse, dans tous les secteurs de la section du jet, soit dirigé vers l'axe central (9) de la buse.
  8. Procédé selon la revendication 7, caractérisé en ce que le flux à la sortie de la buse, dans tous les secteurs de la section du jet, soit orienté vers un point commun sur l'axe central (9) de la buse.
  9. Dispositif d'application du procédé selon une des revendications 1 à 8, caractérisé par un élément servant à produire un jet, cet élément est installable sur un support et a au moins deux orifices de sortie (8) de forme et dimension différente uniformément répartis sur sa section.
  10. Dispositif d'application du procédé selon la revendication 9, caractérisé en ce que les orifices de sortie (8) soient à l'intérieur d'un secteur dont les limites représentent une enveloppante sans points d'inflexion.
  11. Dispositif d'application du procédé selon la revendication 9 ou 10, caractérisé en ce que les orifices de sortie (8) soient de section circulaire.
EP93119416A 1992-12-22 1993-12-02 Procédé et appareil de broyage à jet à lit fluidisé Expired - Lifetime EP0603602B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4243438 1992-12-22
DE4243438A DE4243438C2 (de) 1992-12-22 1992-12-22 Verfahren und Vorrichtung zur Fließbett-Strahlmahlung

Publications (2)

Publication Number Publication Date
EP0603602A1 EP0603602A1 (fr) 1994-06-29
EP0603602B1 true EP0603602B1 (fr) 1997-05-14

Family

ID=6476080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93119416A Expired - Lifetime EP0603602B1 (fr) 1992-12-22 1993-12-02 Procédé et appareil de broyage à jet à lit fluidisé

Country Status (10)

Country Link
US (1) US5423490A (fr)
EP (1) EP0603602B1 (fr)
JP (1) JP3095937B2 (fr)
KR (1) KR970001784B1 (fr)
CN (1) CN1051254C (fr)
AT (1) ATE152933T1 (fr)
DE (2) DE4243438C2 (fr)
ES (1) ES2104024T3 (fr)
MY (1) MY112091A (fr)
TW (1) TW246650B (fr)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19513034A1 (de) * 1995-04-06 1996-10-10 Nied Roland Vorrichtung für die Fließbett-Strahlmahlung
DE19513035C2 (de) * 1995-04-06 1998-07-30 Nied Roland Fließbett-Strahlmahlung
DE19728382C2 (de) * 1997-07-03 2003-03-13 Hosokawa Alpine Ag & Co Verfahren und Vorrichtung zur Fließbett-Strahlmahlung
US6038987A (en) * 1999-01-11 2000-03-21 Pittsburgh Mineral And Environmental Technology, Inc. Method and apparatus for reducing the carbon content of combustion ash and related products
CN1287023A (zh) * 1999-09-08 2001-03-14 株式会社威士诺 喷射式粉碎机
DE10007794A1 (de) 2000-02-21 2001-06-28 Zimmer Ag Polymerzusammensetzung und daraus hergestellter Formkörper
US6951312B2 (en) * 2002-07-23 2005-10-04 Xerox Corporation Particle entraining eductor-spike nozzle device for a fluidized bed jet mill
US6942170B2 (en) * 2002-07-23 2005-09-13 Xerox Corporation Plural odd number bell-like openings nozzle device for a fluidized bed jet mill
DE102005039118A1 (de) * 2005-08-18 2007-02-22 Wacker Chemie Ag Verfahren und Vorrichtung zum Zerkleinern von Silicium
DE102006017472A1 (de) * 2006-04-13 2007-10-18 Nied, Roland, Dr. Ing. Verfahren zur Erzeugung feinster Partikel mittels einer Strahlmühle
US8858699B2 (en) * 2006-07-13 2014-10-14 Unimin Corporation Ultra fine nepheline syenite powder and products for using same
US20080040980A1 (en) * 2006-07-13 2008-02-21 Unimin Corporation Method of processing nepheline syenite
US20080015104A1 (en) 2006-07-13 2008-01-17 Unimin Corporation Ultrafine nepheline syenite
ES2378898T3 (es) 2006-12-14 2012-04-18 Tronox Llc Boquilla de chorro mejorada para uso en un micronizador de molino de chorro
US7757976B2 (en) * 2007-02-07 2010-07-20 Unimin Corporation Method of processing nepheline syenite powder to produce an ultra-fine grain size product
US7959095B2 (en) * 2007-06-27 2011-06-14 E. I. Du Pont De Nemours And Company Center-feed nozzle in a contained cylindrical feed-inlet tube for improved fluid-energy mill grinding efficiency
JP5275345B2 (ja) * 2007-07-09 2013-08-28 ユニミン コーポレーション 制御された粒子径を有する霞石閃長岩粉末とその新規製造方法
WO2009128857A1 (fr) 2008-04-17 2009-10-22 Unimin Corporation Poudre formée à partir de matières minérales ou rocheuses avec une distribution de dimension de particules contrôlée pour des films thermiques
DE102014211037A1 (de) * 2014-06-10 2015-12-17 Wacker Chemie Ag Siliciumkeimpartikel für die Herstellung von polykristallinem Siliciumgranulat in einem Wirbelschichtreaktor
KR102149323B1 (ko) * 2016-11-07 2020-08-31 와커 헤미 아게 실리콘을 함유하는 고형물을 분쇄하는 방법
CN108543605B (zh) * 2018-04-28 2019-04-16 中国计量大学 自由剪切湍流阵列无损解聚及精密分级led荧光粉的方法
DE102021002671A1 (de) 2021-05-21 2022-11-24 Hosokawa Alpine Aktiengesellschaft Verfahren zur Ermittlung des optimalen Düsenabstands in Strahlmühlen und Mahlverfahren zur Erzeugung feinster Partikel

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US1935344A (en) * 1931-06-16 1933-11-14 American Pulverizing Corp Camd Impact pulverizer
US1948609A (en) * 1932-01-18 1934-02-27 American Pulverizing Corp Method of pulverizing minerals and similar materials
DE598421C (de) * 1932-01-18 1934-06-13 Internat Pulverizing Corp Verfahren und Vorrichtung zum Prallzerkleinern
US2309036A (en) * 1940-09-12 1943-01-19 Beardsley & Piper Co Apparatus for conditioning molding sand
FR963005A (fr) * 1947-03-11 1950-06-28
US2605144A (en) * 1950-08-25 1952-07-29 Gen Electric Nozzle
US2704635A (en) * 1951-06-02 1955-03-22 Conrad M Trost Pulverizing mill having opposed jets and circulatory classification
US2846150A (en) * 1955-09-29 1958-08-05 Texaco Development Corp Fluid energy grinding
CA919370A (en) * 1968-04-19 1973-01-23 Spray Steelmaking Limited Atomization of molten material with provision of clearing gas orifice
DE2040519C2 (de) * 1970-08-14 1984-04-12 Alpine Ag, 8900 Augsburg Fließbettstrahlmühle
DE2628612A1 (de) * 1976-06-25 1977-12-29 Gvnii Zementnoj Promy Niizemen Strahlduese fuer strahlapparate
SU1168288A1 (ru) * 1982-08-19 1985-07-23 Министерство Мелиорации И Водного Хозяйства Северо-Осетинской Асср Устройство дл измельчени нитчатых водорослей
GB2145351A (en) * 1983-08-24 1985-03-27 Howden James & Co Ltd Pulverizer
US4638953A (en) * 1985-07-19 1987-01-27 Taylor David W Classifier for comminution of pulverulent material by fluid energy
US4905918A (en) * 1988-05-27 1990-03-06 Ergon, Inc. Particle pulverizer apparatus
JP3031923B2 (ja) * 1989-07-07 2000-04-10 フロイント産業株式会社 造粒コーティング装置およびそれを用いた造粒コーティング方法

Also Published As

Publication number Publication date
TW246650B (fr) 1995-05-01
KR970001784B1 (ko) 1997-02-15
ES2104024T3 (es) 1997-10-01
ATE152933T1 (de) 1997-05-15
CN1051254C (zh) 2000-04-12
DE4243438A1 (de) 1994-06-23
DE4243438C2 (de) 1996-06-05
MY112091A (en) 2001-04-30
DE59306446D1 (de) 1997-06-19
EP0603602A1 (fr) 1994-06-29
JP3095937B2 (ja) 2000-10-10
JPH0747298A (ja) 1995-02-21
US5423490A (en) 1995-06-13
CN1091338A (zh) 1994-08-31
KR940013611A (ko) 1994-07-15

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