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EP0102421B1 - Appareil de pulvérisation - Google Patents

Appareil de pulvérisation Download PDF

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Publication number
EP0102421B1
EP0102421B1 EP82304551A EP82304551A EP0102421B1 EP 0102421 B1 EP0102421 B1 EP 0102421B1 EP 82304551 A EP82304551 A EP 82304551A EP 82304551 A EP82304551 A EP 82304551A EP 0102421 B1 EP0102421 B1 EP 0102421B1
Authority
EP
European Patent Office
Prior art keywords
vessel
vortex
nozzles
pulverized
outlet
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
Application number
EP82304551A
Other languages
German (de)
English (en)
Other versions
EP0102421A1 (fr
Inventor
Robert Ross Wilson
Roy David Falconer
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.)
James Howden and Co Ltd
Original Assignee
James Howden and Co Ltd
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 James Howden and Co Ltd filed Critical James Howden and Co Ltd
Priority to AT82304551T priority Critical patent/ATE21050T1/de
Priority to EP82304551A priority patent/EP0102421B1/fr
Priority to DE8282304551T priority patent/DE3272312D1/de
Publication of EP0102421A1 publication Critical patent/EP0102421A1/fr
Application granted granted Critical
Publication of EP0102421B1 publication Critical patent/EP0102421B1/fr
Expired legal-status Critical Current

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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
    • B02C19/061—Jet mills of the cylindrical type

Definitions

  • the present invention relates to pulverizing apparatus.
  • a pulverizing apparatus for example for use in the pulverizing of coal, which comprises a generally cylindrical vessel having feed means for feeding the material to the pulverizer into said vessel, a plurality of circumferentially spaced fluid injection nozzles each angled between a radius to the cylindrical vessel passing through the nozzles and a direction perpendicular to such radius, to inject fluid into the vessel and induce an axially flowing vortex in the vessel, having its axis generally centrally of the vessel, and to provide transverse wall means at a location remote from the nozzles to intercept the vortex and to deflect a portion of the fluid medium and entrained particles of material to effect a recirculation of the fluid medium within the vessel and thus to form a curtain surrounding the vortex, whereby the material is pulverized by interparticle collisions and the curtain reduces high speed particle contact with the cylindrical wall of the vessel.
  • An outlet is provided in the transverse wall through which a fraction of the pulverized material below a predetermined mass will pass generally along the axis of the vortex, the remaining particle sizes being swept out by centrifugal force for recirculation and repulverizing.
  • Such an apparatus is generally satisfactory but has certain shortcomings. It is an object of the present invention to overcome, at least in part, these shortcomings.
  • the means for feeding the material to be pulverized should be arranged to feed the material through a generally axially extending feed tube passing through the transverse wall to the point adjacent the axial centre of the vessel in the vicinity of the nozzles.
  • the feed tube passes through the outlet in the transverse wall, so that the outlet is made annular.
  • Such an arrangement of the feed means ensures that a pile of material to be pulverised is formed on the bottom of the vessel and this pile is generally symmetrical and therefore does not disturb the proper formation of the vortex, thus giving an improved pulverizing effect.
  • the feed tube may be surmounted by a feed hopper and the material to be pulverized can flow simply by gravity and can operate in the manner of a chicken feeder, so that the amount of material to be pulverized is controlled by the size of the pile of material on the base.
  • An annular shroud advantageously surrounds the outlet and the feed tube to assist in the cyclone separation of the heavier particles from those particles passing out of the vessel.
  • a base plate is placed within the vessel at a location below the point of feed, and on which a substantially symmetrical pile of material to be pulverized is formed, and at least one opening is provided through said base plate at or near its periphery for the passage of heavy particles, which are not taken up by the vortex.
  • pulverizing coal for example, there is often a certain amount of stone within the coal and this tends to be heavier than the coal and one, quite clearly, does not wish to include pulverized stone in the pulverized coal. The advantage therefore arises that the heavy material tends to move outwardly from the pile and lodge near the corner of the base plate.
  • the opening may be in the form of a complete annulus with the base plate supported centrally from below, or could be in the form of a number of spaced openings or notches in the periphery of the base plate itself which is otherwise secured to the cylindrical wall of the vessel, e.g. by welding.
  • the apparatus illustrated in the drawing comprises a vessel indicated by the general reference numeral 10 comprising a cylindrical wall 11, a top domed cover 12 and a bottom domed cover 13.
  • a vessel indicated by the general reference numeral 10 comprising a cylindrical wall 11, a top domed cover 12 and a bottom domed cover 13.
  • Extending axially within the domed cover 12 is an outlet 14 having an annular shroud 15 extending within the internal volume of the vessel 10.
  • a feed tube 16 surmounted by a hopper 17 which may be fed with material, such as coal, to be pulverized by way of a conveyor 18.
  • the outlet 14 is provided with a number, say four, of outlet ducts 19 for feeding the pulverized material on to a point of use, for example to a boiler or further treatment zone.
  • a base plate 20 Adjacent the lower end of the cylindrical wall portion 11 is a base plate 20 which is secured to the cylindrical wall, e.g. by welding and provided with a plurality of circumferentially spaced openings 21.
  • an inclined ramp 22 With a discharge conveyor 23 at its lowest point.
  • a plurality of circumferentially spaced injection nozzles 24 Projecting inwardly into the cylindrical wall 11 of the vessel 10 are a plurality of circumferentially spaced injection nozzles 24 which are arranged to point upwardly somewhat and also at an angle to the radius passing through the nozzle. These nozzles, therefore, induce within the vessel 10 a vortex comprising a central upwardly axially flowing vortex portion 25 which impinges against the transverse wall formed by the upper domed cover 12 so that the stream of fluid flows downwardly to provide a curtain 26 which is peripheral to the core zone defined by the vortex portion 25.
  • the flow splits into a portion 27 which is recirculated through the upwardly flowing vortex portion and a further circumferential portion 28 which flows upwardly to rejoin the downwardly flowing part 26 adjacent the transverse wall formed by the cover 12.
  • material to be pulverized for example coal
  • material to be pulverized for example coal
  • the coal particles are picked up by the vortex and swirled around in the manner indicated and there is a considerable amount of interparticle collision which produces a grinding effect.
  • the heavier particles move outwardly in the vortex which is thus in a form of a cyclone separator and pass down the stream 26, while the lighter portions exit through the shroud 15 and outlet 14 to discharge through the outlet ducts 19.
  • Very heavy particles for example, stones, are not taken up by the vortex and pass downwardly through the openings 21 onto the ramp 22 for discharge by the conveyor 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Sink And Installation For Waste Water (AREA)

Claims (5)

1. Appareil de pulvérisation comprenant un récipient de forme générale cylindrique (10), des moyens d'amenée (16) pour amener le matériau à pulvériser dans ce récipient, une multiplicité de buses d'injection de fluide (24) circonférentielle- ment espacées, chaque buse étant orientée entre un rayon du récipient cylindrique passant à travers les buses et une direction perpendiculaire à ce rayon, pour injecter du fluide dans le récipient et induire un tourbillon (25) se déplaçant axialement dans le récipient et ayant son axe généralement au centre de celui-ci, des moyens de paroi transversale (12) situés à un endroit éloigné des buses pour intercepter le tourbillon et dévier une portion (26) du fluide et des particules de matériau entraînées pour recycler le fluide à l'intérieur du récipient et former ainsi un rideau entourant le tourbillon, d'où il résulte que le matériau est pulvérisé par des collisions entre les particules et que le rideau réduit les impacts des particules à grande vitesse sur la paroi cylindrique du récipient, et une sortie (14) dans cette paroi transversale à travers laquelle une fraction du matériau pulvérisé en dessous d'une masse prédéterminée passe généralement selon l'axe du tourbillon, caractérisé en ce que les moyens (16) pour amener le matériau à pulvériser comprennent un tube d'amenée (16) s'étendant de façon générale axialement et passant à travers la paroi transversale (12) jusqu'à un point adjacent au centre axial du récipient à proximité des buses et en ce que le tube d'amenée (16) passe à travers la sortie (14) dans la paroi transversale, de sorte que cette sortie devient annulaire.
2. Appareil selon la revendication 1, caractérisé en ce qu'une enveloppe de protection annulaire (15) entoure cette sortie et ce tube d'amenée.
3. Appareil selon la revendication 1 et la revendication 2, caractérisé en ce qu'une trémie d'alimentation (17) est montée sur le sommet du tube d'amenée et que le matériau à amener passe à travers le tube d'amenée par gravité.
4. Appareil selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une plaque de base (20) est placée à l'intérieur du récipient à un endroit situé en dessous du point où se forme un monceau pratiquement symétrique (30) du matériau à pulvériser et en ce qu'au moins une ouverture (21) est prévue à travers la plaque de base sur ou au voisinage de sa périphérie pour laisser passer les particules lourdes qui ne sont pas entraînées par le tourbillon.
5. Appareil selon la revendication 4, caractérisé en ce qu'un convoyeur (23) est prévu pour enlever ces particules lourdes depuis un emplacement situé sous la plaque de base.
EP82304551A 1982-08-27 1982-08-27 Appareil de pulvérisation Expired EP0102421B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT82304551T ATE21050T1 (de) 1982-08-27 1982-08-27 Prallzerkleinerer.
EP82304551A EP0102421B1 (fr) 1982-08-27 1982-08-27 Appareil de pulvérisation
DE8282304551T DE3272312D1 (en) 1982-08-27 1982-08-27 Pulverizing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82304551A EP0102421B1 (fr) 1982-08-27 1982-08-27 Appareil de pulvérisation

Publications (2)

Publication Number Publication Date
EP0102421A1 EP0102421A1 (fr) 1984-03-14
EP0102421B1 true EP0102421B1 (fr) 1986-07-30

Family

ID=8189755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304551A Expired EP0102421B1 (fr) 1982-08-27 1982-08-27 Appareil de pulvérisation

Country Status (3)

Country Link
EP (1) EP0102421B1 (fr)
AT (1) ATE21050T1 (fr)
DE (1) DE3272312D1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155120A3 (fr) * 1984-03-13 1987-02-25 JAMES HOWDEN & COMPANY LIMITED Procédé d'opération d'un brûleur à charbon
EP0164878B1 (fr) * 1984-05-11 1991-01-23 JAMES HOWDEN & COMPANY LIMITED Procédé pour opérer un four métallurgique
AU2873195A (en) * 1994-07-11 1996-02-09 Pmt Gesteinsvermahlungstechnik Powder Maker Technologies Gmbh Spiral jet mill
AUPN388195A0 (en) * 1995-06-29 1995-07-20 Glover, Mark Richard Water grinding of particulate material using high and ultra high pressure water processing
AUPN829796A0 (en) * 1996-02-23 1996-03-21 Bengold Holdings Pty Ltd Improved grinding method and apparatus for performing same
DE19824062A1 (de) * 1998-05-29 1999-12-02 Roland Nied Mahlverfahren unter Verwendung einer Strahlmühle
RU2209672C1 (ru) * 2002-02-06 2003-08-10 Государственное предприятие "Всероссийский научно-исследовательский институт физико-технических и радиотехнических измерений" Вихревая мельница
RU2226431C1 (ru) * 2002-09-10 2004-04-10 Скорняков Александр Викторович Способ и устройство для вихревого диспергирования материалов
CN115846016B (zh) * 2022-12-08 2023-09-08 徐州科建环保科技有限公司 一种废钢渣制备高活性钢渣微粉用气流磨及研磨方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB469068A (en) * 1935-12-21 1937-07-19 Benjamin Graemiger Pulveriser
US3608835A (en) * 1967-06-30 1971-09-28 Josef Ruzicka Ultradisintegration and agglomeration of minerals such as mica, products therefrom and apparatus therefor
US4219164A (en) * 1979-03-16 1980-08-26 Microfuels, Inc. Comminution of pulverulent material by fluid energy

Also Published As

Publication number Publication date
EP0102421A1 (fr) 1984-03-14
ATE21050T1 (de) 1986-08-15
DE3272312D1 (en) 1986-09-04

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