EP0102421A1 - Appareil de pulvérisation - Google Patents

Appareil de pulvérisation Download PDF

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Publication number
EP0102421A1
EP0102421A1 EP82304551A EP82304551A EP0102421A1 EP 0102421 A1 EP0102421 A1 EP 0102421A1 EP 82304551 A EP82304551 A EP 82304551A EP 82304551 A EP82304551 A EP 82304551A EP 0102421 A1 EP0102421 A1 EP 0102421A1
Authority
EP
European Patent Office
Prior art keywords
vessel
vortex
feed
nozzles
pulverized
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.)
Granted
Application number
EP82304551A
Other languages
German (de)
English (en)
Other versions
EP0102421B1 (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 EP82304551A priority Critical patent/EP0102421B1/fr
Priority to DE8282304551T priority patent/DE3272312D1/de
Priority to AT82304551T priority patent/ATE21050T1/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

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00Other disintegrating devices or methods
    • B02C19/06Jet mills
    • B02C19/061Jet 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.
  • the means for feeding the material to be pulverized should be arranged to feed the material to a point adjacent to the axial centre of the vessel in the vicinity of the nozzles.
  • Such an arrangement of the feed means ensures that a pile of material to be pulverized 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 means can comprise a substantially radially extending screw conveyor having forward feeding flights passing from the feed side substantially to the axis of the vessel and reverse feeding flights beyond the axis
  • a feed arrangement has a disadvantage that the screw conveyor can be damaged, and eventually worn out, by particle impact, and the further disadvantage that it disturbs the vortex flow within the vessel. It is therefore preferred that the feed means should extend generally axially through the vessel.
  • the feed means can include a generally axially extending feed tube through the end wall of the conveyor remote from the transverse wall means, in a preferred arrangement the feed means comprises 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 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.
  • the feed tube preferably passes through the outlet in the transverse wall, so that the outlet is made annular, and 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.
  • 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 25.
  • the lower end of the downward flow 26 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.
  • An alternative feed arrangement is shown in phantom and comprises an upwardly extending axial feed tube 32 having a screw conveyor 33 therewithin. This must be fed from a source (not shown) of the material to be pulverized.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Sink And Installation For Waste Water (AREA)
  • Crushing And Pulverization Processes (AREA)
EP82304551A 1982-08-27 1982-08-27 Appareil de pulvérisation Expired EP0102421B1 (fr)

Priority Applications (3)

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

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 true EP0102421A1 (fr) 1984-03-14
EP0102421B1 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)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155120A2 (fr) * 1984-03-13 1985-09-18 JAMES HOWDEN & COMPANY LIMITED Procédé d'opération d'un brûleur à charbon
EP0164878A2 (fr) * 1984-05-11 1985-12-18 JAMES HOWDEN & COMPANY LIMITED Procédé pour opérer un four métallurgique
WO1996001694A1 (fr) * 1994-07-11 1996-01-25 Pmt Gesteinsvermahlungstechnik Powder Maker Technologies Gmbh Desintegrateur a jet helicoidal
WO1997001391A1 (fr) * 1995-06-29 1997-01-16 Mark Richard Glover Broyage par eau de materiau particulaire a l'aide d'un traitement par eau a pression elevee ou extremement elevee
WO1997030790A1 (fr) * 1996-02-23 1997-08-28 Water Jet Technologies Pty. Ltd. Procede et appareil de broyage de particules a l'aide de jets a ultra haute pression
DE19824062A1 (de) * 1998-05-29 1999-12-02 Roland Nied Mahlverfahren unter Verwendung einer Strahlmühle
CN115846016A (zh) * 2022-12-08 2023-03-28 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

Citations (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
US3719329A (en) * 1967-06-30 1973-03-06 J Ruzicka Ultradisintegration and agglomeration of minerals such as mica, products therefrom and apparatus therefor
EP0017367A1 (fr) * 1979-03-16 1980-10-15 MICROFUELS, Inc. Appareil et méthode de broyage de matériaux pulvérulents par énergie fluidique

Patent Citations (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
US3719329A (en) * 1967-06-30 1973-03-06 J Ruzicka Ultradisintegration and agglomeration of minerals such as mica, products therefrom and apparatus therefor
EP0017367A1 (fr) * 1979-03-16 1980-10-15 MICROFUELS, Inc. Appareil et méthode de broyage de matériaux pulvérulents par énergie fluidique

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155120A2 (fr) * 1984-03-13 1985-09-18 JAMES HOWDEN & COMPANY LIMITED Procédé d'opération d'un brûleur à charbon
EP0155120A3 (fr) * 1984-03-13 1987-02-25 JAMES HOWDEN & COMPANY LIMITED Procédé d'opération d'un brûleur à charbon
EP0164878A2 (fr) * 1984-05-11 1985-12-18 JAMES HOWDEN & COMPANY LIMITED Procédé pour opérer un four métallurgique
EP0164878A3 (en) * 1984-05-11 1987-03-04 James Howden & Company Limited Method of operating metallurgical furnace and a metallurgical furnace apparatus
WO1996001694A1 (fr) * 1994-07-11 1996-01-25 Pmt Gesteinsvermahlungstechnik Powder Maker Technologies Gmbh Desintegrateur a jet helicoidal
WO1997001391A1 (fr) * 1995-06-29 1997-01-16 Mark Richard Glover Broyage par eau de materiau particulaire a l'aide d'un traitement par eau a pression elevee ou extremement elevee
WO1997030790A1 (fr) * 1996-02-23 1997-08-28 Water Jet Technologies Pty. Ltd. Procede et appareil de broyage de particules a l'aide de jets a ultra haute pression
DE19824062A1 (de) * 1998-05-29 1999-12-02 Roland Nied Mahlverfahren unter Verwendung einer Strahlmühle
CN115846016A (zh) * 2022-12-08 2023-03-28 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
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

Also Published As

Publication number Publication date
ATE21050T1 (de) 1986-08-15
EP0102421B1 (fr) 1986-07-30
DE3272312D1 (en) 1986-09-04

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