EP1247582B1 - Appareil pour le broyage de matière en vrac - Google Patents

Appareil pour le broyage de matière en vrac Download PDF

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Publication number
EP1247582B1
EP1247582B1 EP20020006336 EP02006336A EP1247582B1 EP 1247582 B1 EP1247582 B1 EP 1247582B1 EP 20020006336 EP20020006336 EP 20020006336 EP 02006336 A EP02006336 A EP 02006336A EP 1247582 B1 EP1247582 B1 EP 1247582B1
Authority
EP
European Patent Office
Prior art keywords
area
milling
section
jet nozzles
grinding
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
EP20020006336
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German (de)
English (en)
Other versions
EP1247582A2 (fr
EP1247582A3 (fr
Inventor
Josef Fischer
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.)
Lehigh Technologies Inc
Original Assignee
Lehigh Technologies Inc
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Filing date
Publication date
Application filed by Lehigh Technologies Inc filed Critical Lehigh Technologies Inc
Publication of EP1247582A2 publication Critical patent/EP1247582A2/fr
Publication of EP1247582A3 publication Critical patent/EP1247582A3/fr
Application granted granted Critical
Publication of EP1247582B1 publication Critical patent/EP1247582B1/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
    • B02C19/065—Jet mills of the opposed-jet type
    • 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 a device for crushing bulk material, in particular a fluidized bed counter-jet mill, with a housing arranged with a vertical axis, which provided a lower, provided with compressed air grinding nozzles Mahlrios and an upper, provided by a preferably with a bulk material feeding riser from Mahl Suite distanced, provided with a separation device separation region.
  • the grinding chamber was designed in the riser area with a smaller clear cross-section.
  • a adjustable glare insert can be provided. This can also be subsequently attached in an advantageous manner and therefore provides a simple and cost-effective way to retrofit existing devices generic type to increase the throughput.
  • a further advantageous measure may consist in that the grinding area has a barrel-shaped circumferential boundary. This favorably avoids the avoidance of flow losses in the context of the torus flow which rotates from the inside to the outside and vice versa.
  • Another, particularly preferable measure may be that comparatively many, small grinding nozzles are provided at the periphery of the grinding area.
  • small grinding nozzles can be in an advantageous manner in contrast to little, large grinding nozzles accomplish a particularly uniform formation of the resulting material in the grinding material cloud, which advantageously leads to a high hit frequency and thus favors the rapid comminution of the ground material.
  • Fluid bed counter-jet mills are used to comminute various soft and / or brittle and / or hard bulk materials such as glass, rock, wax, resin, metal, and the like.
  • the basic structure and the mode of action of such arrangements are known per se.
  • FIG. 1 underlying fluidized bed counter-jet mill consists in a conventional manner of a arranged with a vertical axis, pot-like housing 1, which contains a lower grinding area 2, an upper separation area 3 and between a distance between the grinding area 2 and 3 separation separation region bridging 4.
  • the said areas are arranged coaxially one above the other.
  • the grinding area 2 are associated with the radial axis and coplanar arranged, attached to the peripheral boundary of the grinding area 2 grinding nozzles 5. These can be acted upon with compressed air.
  • the housing 1 is suitably provided in the region of the riser 4 comprehensive, connectable to a compressed air source ring line 6, depart from the nozzle 5 leading stub lines 7.
  • the compressed air is appropriately compressed to a pressure of 3 - 6 bar.
  • the grinding area expediently has a circular cross section. But other cross-sectional shapes, such as ellipsoidal or polygonal are conceivable.
  • the separation region 3 contains a separating device 8, which is arranged with an expediently arranged above the housing 1 and not shown in greater detail here.
  • This separating device is preferably designed as an air classifier.
  • the separating device 8 contains an outwardly leading outlet nozzle 9 for the finished regrind.
  • the riser 4 is formed as a simple shaft.
  • the product feed takes place above the grinding area 2.
  • a feed nozzle 10 opening into the riser area 4 is provided.
  • This may be assigned to a shut-off device, not shown here, which is controllable so that the existing material in the housing 1 remains largely constant.
  • the housing 1 can be easily accommodated on load cells 11, by which said shut-off device can be controlled. It would also be conceivable to provide other level detectors, such as capacitive or inductive probes
  • the inlet cross section 13 of the riser region 4 is smaller than the cross section of the grinding zone 2 present in the area of the grinding nozzles 5.
  • This reduction in cross section can be achieved by flaps associated with the inlet cross section 13 or, as in the illustrated examples, by one in the transition zone between Mahl Society 2 and riser 4 provided constriction of the interior of the housing 1, through which a smaller inside diameter of the inlet cross-section 13 and thus automatically results in a reduction of the free cross-sectional area, be accomplished.
  • the grinding area 2 is bounded above by a circumferential inwardly directed from its circumferential wall inwardly constriction 14 of the housing 1, through which a relation to the cross section of the grinding area 2 reduced input cross-section 13 of the riser 4 results.
  • the riser 4 may have a same cross-sectional shape as the grinding area 2, which here has a round cross section, so that there is a uniform circumferential Gescouseinschnürung.
  • the riser 4 as shown FIG. 2 can be seen, a square cross-section with a comparison with the diameter of a round cross-section having grinding area 2 of reduced edge length.
  • the edge length of the cross-section of the riser region 4 is chosen here so as to produce a square encompassed by the handling of the grinding region 2 as an enveloping circle. This results in between the outer periphery of the grinding area 2 and the wall of the riser 4 four circular section-shaped column, through corresponding cover plates 15 are closed. These can be arranged horizontally.
  • the cover plates 15 are arranged rising at an angle of 45 ° from outside to inside. This proves to be streamlined, as a result so-called dead water areas can be avoided.
  • the bottom 16 of the grinding area 2 can connect to the rotating, drum-shaped jacket 18 of the grinding area 2 via an edge-side arc area 17. It would also be conceivable to deepen the bottom of the grinding area 2 downwards, for example in the form of an in FIG. 3 indicated by a broken line, funnel-like depression or in FIG. 4 indicated by a broken line dome-shaped depression.
  • the side edges 20 of the annular diaphragm insert 19 extend from the already explained in connection with the inclination of the cover plates 15, fluidic reasons to the center converging.
  • the side edges 20 of the blend insert 19 are additionally arcuately grooved. This results in a particularly low-loss flow deflection in the upper, outer edge region of the grinding region 2.
  • the radius of curvature of the groove of the side edges 20 may correspond approximately to the radius of curvature of the outer arc portion 17 of the bottom 16 of the grinding region 2.
  • the bottom 16 can also, as already mentioned above, be funnel-shaped or dome-shaped recessed, as indicated by a broken line.
  • the blend insert 19 is designed as a rigid molded part.
  • an adjustable glare insert designed approximately in the manner of a so-called iris diaphragm.
  • the size of the input section 13 could be adjusted and thus experimentally adapted to the conditions of the individual case.
  • the circumferential jacket 18 of the grinding area 2 is barrel-shaped, that is, outwardly convex and concave inwardly. Accordingly, the grinding area 2 has a cross-section which narrows continuously from the level containing the grinding nozzles 5 upwards and downwards.
  • the upper edge of the barrel-shaped shell 18 has Accordingly, a smaller diameter than the grinding nozzles 5 containing center plane.
  • At the upper edge of the jacket 18 of the riser 4 connects, which here has a constant, the contour of the upper edge of the barrel-shaped shell 18 corresponding circular cross-section over its entire height.
  • the inlet cross-section 13 of the riser region 4 corresponds to the cross-section of the upper shell-side edge which, due to the cross-sectional constriction of the grinding region 2, as already mentioned above, is smaller than the cross-sectional plane of the grinding region 2 containing the grinding nozzles 5.
  • the bottom 16 of the grinding area 2 is here designed to achieve a simple production as a flat bottom. A depression in the form of a chalotte-like depression indicated by a broken line would be preferable in terms of flow technology.
  • the individual particles of the ground material hit each other in the effective range of the compressed air jets 12 with a relatively strong pulse and are correspondingly intensively crushed, so that quickly the desired grain size is achieved, resulting in a high throughput.
  • entering via the input section 13 in the riser 4 air takes with the fine grain and performs this the separating 8.
  • the rapid and intensive material crushing of the fine grain content in the riser (4) reaching flow is very high, so that in an advantageous Way even a comparatively small height of the riser 4 sufficient.
  • the above-mentioned, rapid and intensive comminution of the ground material is promoted by the most uniform possible formation of the material cloud formed in the grinding zone 2.
  • comparatively many grinding nozzles 5 are provided on the circumference of the grinding area 2 radially delimiting shell 18, which, however, have a comparatively small nozzle cross-section, so that the total compressed air consumption in about the total compressed air consumption of the known arrangements with comparatively little, but corresponds to a large nozzle cross-section having grinding nozzles.
  • six grinding nozzles 5 are provided on the periphery. These are, as already mentioned above, in a common radial plane and are arranged with radially directed axis.
  • the number of used grinding nozzles depends on the size.

Landscapes

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

Claims (5)

  1. Dispositif servant à broyer un produit en vrac, en particulier un broyeur à contre-jet à lit fluidisé, comprenant un boîtier (1) disposé selon un axe vertical, lequel boîtier présente une zone de broyage inférieure (2) pourvue de buses de broyage (5) pouvant être soumises à l'action d'air comprimé et une zone de séparation supérieure (3) tenue à distance de la zone de broyage (2) par une zone ascendante (4) qui est pourvue de préférence d'un système d'alimentation en produit en vrac (6), et pourvue d'un système de séparation (8), sachant que la zone ascendante (4) présente une dimension intérieure d'entrée (13) plus petite par rapport à la dimension intérieure prévue dans la zone des buses de broyage (5) de la zone de broyage (2) ; caractérisé en ce qu'est disposé au niveau du passage de la zone de broyage (2) à la zone ascendante (4) un insert de protection (19) qui présente des flancs latéraux (20) s'étendant de préférence de manière concave et convergeant en direction du centre, sachant que la dimension intérieure de l'insert de protection (15) peut être ajustée.
  2. Dispositif selon la revendication 1, caractérisé en ce que la zone de broyage (2) présente une délimitation périphérique (18) concave vers l'intérieur et ayant une forme de tonneau ; et présente de préférence, au moins au-dessus des buses de broyage (5), une section transversale se rétrécissant en continu vers le haut.
  3. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la zone de broyage (2) est arrondie (17) dans la zone de son bord côté fond, et en ce que le fond (16) de la zone de broyage (2) est réalisé de préférence de manière à présenter une forme d'entonnoir ou une forme de calotte.
  4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que comparativement de nombreuses buses de broyage (5) de petite taille sont prévues sur la périphérie de la zone de broyage (2), sachant que de préférence au moins quatre buses de broyage (5) sont prévues pour un dimensionnement permettant un débit air-gaz pouvant aller jusqu'à 250 Nm3/h, au moins six buses de broyage (5) sont prévues pour un dimensionnement permettant un débit air-gaz pouvant aller jusqu'à 500 Nm3/h, au moins sept buses de broyage (5) sont prévues pour un dimensionnement permettant un débit air-gaz pouvant aller jusqu'à 1000 Nm3/h, et au moins huit buses de broyage (5) sont prévues pour un dimensionnement permettant un débit air-gaz supérieure à 1000 Nm3/h.
  5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le boîtier (1) est logé sur des cellules de pesée (11), lesquelles permettent de commander un système de blocage du système d'alimentation en produit en vrac (10).
EP20020006336 2001-04-03 2002-03-21 Appareil pour le broyage de matière en vrac Expired - Lifetime EP1247582B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10116483 2001-04-03
DE2001116483 DE10116483B4 (de) 2001-04-03 2001-04-03 Vorrichtung zum Zerkleinern von Schüttgut

Publications (3)

Publication Number Publication Date
EP1247582A2 EP1247582A2 (fr) 2002-10-09
EP1247582A3 EP1247582A3 (fr) 2004-11-24
EP1247582B1 true EP1247582B1 (fr) 2013-07-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020006336 Expired - Lifetime EP1247582B1 (fr) 2001-04-03 2002-03-21 Appareil pour le broyage de matière en vrac

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EP (1) EP1247582B1 (fr)
DE (1) DE10116483B4 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE510626T1 (de) * 2003-09-19 2011-06-15 Micropulva Ltd Oy Verbesserte beschleunigungsdüse für gas-feststoff-suspension
DE102006001937A1 (de) * 2006-01-14 2007-09-27 Lehigh Technologies, LLC, Naples Trennen von Mineralien
DE102013002237B3 (de) * 2013-02-11 2014-05-22 Microtec Gmbh Sichtermühle
US10675634B2 (en) 2015-08-13 2020-06-09 Lehigh Technologies, Inc. Systems, methods, and apparatuses for manufacturing micronized powder
CN108114793B (zh) * 2017-12-13 2023-08-29 廊坊新龙立机械制造有限公司 一种卧式流化床气流粉碎机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE535348C (de) * 1933-01-10 Paul Anger Sichter fuer Luftstrahl-Prallzerkleinerer
DE494041C (de) * 1929-06-08 1930-03-17 Paul Anger Verfahren und Vorrichtung zum Regeln des Energiebedarfs von Luftstrahl-Prallzerkleinerern
DE2510297C2 (de) * 1975-03-10 1987-03-05 Gosudarstvennyj Vsesojuznyj naučno-issledovatel'skij institut cementnoj promyšlennosti Niicement, Moskau/Moskva Strahlmühle
DE2543691C2 (de) * 1975-09-30 1984-01-19 Gosudarstvennyj Vsesojuznyj naučno-issledovatel'skij institut cementnoj promyšlennosti Niicement, Moskva Strahlmühle
JPH10286483A (ja) * 1997-04-14 1998-10-27 Mitsubishi Chem Corp 粉砕分級方法

Also Published As

Publication number Publication date
EP1247582A2 (fr) 2002-10-09
DE10116483A1 (de) 2002-10-17
DE10116483B4 (de) 2006-08-17
EP1247582A3 (fr) 2004-11-24

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