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WO2002034394A1 - Roue broyeuse pour broyeur a ventilateur - Google Patents

Roue broyeuse pour broyeur a ventilateur Download PDF

Info

Publication number
WO2002034394A1
WO2002034394A1 PCT/DE2001/003999 DE0103999W WO0234394A1 WO 2002034394 A1 WO2002034394 A1 WO 2002034394A1 DE 0103999 W DE0103999 W DE 0103999W WO 0234394 A1 WO0234394 A1 WO 0234394A1
Authority
WO
WIPO (PCT)
Prior art keywords
impact
striking
beater
bar
wheel
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.)
Ceased
Application number
PCT/DE2001/003999
Other languages
German (de)
English (en)
Inventor
Bodo Gehrke
Wolfgang Rieker
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.)
GE Power Systems GmbH
Original Assignee
Alstom Power Boiler GmbH
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 Alstom Power Boiler GmbH filed Critical Alstom Power Boiler GmbH
Priority to AU2002215825A priority Critical patent/AU2002215825A1/en
Publication of WO2002034394A1 publication Critical patent/WO2002034394A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/28—Shape or construction of beater elements
    • B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor

Definitions

  • the invention relates to a beater wheel for a fan mill, in particular for the comminution of coal for a pulverized coal firing of a steam generator, with a large number of webs distributed uniformly around the circumference of the beater wheel and extending between the beater wheel hub and the beater wheel ring in the direction of rotation of the beater wheel are reinforced by several striking plates lying parallel to the striking wheel axis.
  • the beater wheel in a coal dust fan mill is used to grind and process coal into coal dust and to convey the coal dust into the coal dust furnaces of steam generators.
  • the raw lignite is comminuted in a coal dust fan mill in such a way that a rotating impact wheel breaks up the coal supplied for it.
  • the beater wheel essentially consists of the beater wheel hub and a beater wheel ring and webs which are inserted between the radially outer part of the beater wheel hub and the beater wheel ring.
  • Striking plates are arranged on the webs, single and multi-part striking plate sets being known. Due to the shredding work and the stress caused by friction, the impact plates are subject to severe wear, which after a relatively short operating time, e.g. 500-5000 hours requires the complete replacement of the striking plates. Due to the intensive wear on the inner edge of the striking plate set, this inner edge is rounded in a very short time and is associated with a loss of the shredding and ventilation performance.
  • the object of the invention is now to provide a beater wheel for a fan mill in which the abovementioned disadvantages can be avoided or the wear rate of the beater plate set can be reduced and the power loss of the fan mill can be avoided.
  • the solution according to the invention creates a beater wheel for a fan mill, which has the following advantages:
  • Constant performance of the fan mill over a long period of operation of the mill and thus investment savings through the use of a smaller mill, reduction of the mill maintenance costs, since only replacement of a blow bar and not a complete set of beater plates per beater wheel web is required and quick removal and installation possible, possibly extending the maintenance intervals for the striking wheels.
  • the striking bar of the respective striking wheel web lying radially on the inside and facing the striking surface on the cross section at least over part of the cross section with a highly wear-resistant material, this part of the cross-section forming the adjoining edge area of the striking surface (the face pointing in the direction of rotation of the striking wheel and the face pointing radially inward) of the striking bar, it is advantageous if the edge area or the highly wear-resistant layer has a thickness or depth of 1 to 50 mm. With such a configuration, a long operating time of the impact wheel can be achieved.
  • the impact bar of the respective impact wheel webs which is located radially on the inside and faces the impact surface, is formed from a ductile base material and the edge region is made from a hard metal armor.
  • this blow bar is formed from a composite material with a ductile metal matrix and hard metal particles embedded therein or from an MMC composite material (Matrix Metal Composite) with ceramic particles embedded therein. Particularly long service life of the blow bars can be achieved with these materials.
  • the grinding material flow profile is non-uniform over the width of the beater wheel, it is advantageous to design the beater bar of each beater wheel web over the length of this beater bar with an unequal cross-section and / or an uneven hard metal armor layer thickness in accordance with the expected mill material flow profile.
  • the particularly affected wear points on the blow bar can be influenced by giving these points a larger cross section or a greater hard metal armor layer thickness than others.
  • each striking wheel web By forming the remaining striking plates of each striking wheel web from a ductile, not highly wear-resistant material - only the radially inner and the The impact bar facing the impact surface consists at least in part of a highly wear-resistant material - material and investment costs can be saved.
  • the impact bar of the respective impact wheel webs of the impact wheel according to the invention is advantageously designed as a rod and inserted into a recess in the adjacent impact plate.
  • the rod-shaped blow bar has a rectangular cross section.
  • the beater bar designed as a rod can also have an L-shaped or an essentially triangular cross section and can either be embedded in a recess of the adjacent beater plate or rest thereon. The shape and installation position of the rod-shaped beater bar can influence the operating time of the beater wheel, since it can cover the parts of the beater wheel that are most susceptible to wear.
  • a particularly good wear protection against the adjacent striking plates of the striking bar of the respective striking wheel webs lying radially on the inside and the striking surface is achieved if the latter striking bar advantageously protrudes in steps from the striking surface of the striking plate set of the respective striking wheel web and thus forms a flow shadow for the neighboring striking boards which largely keeps the abrasive regrind away from the neighboring impact plates. It is also advantageous if the striking bar of the respective striking wheel webs, which is located radially on the inside and faces the striking surface, protrudes in steps towards the striking wheel axis towards the neighboring striking plate by a distance t, since here, too, the adjacent striking plate is largely protected from wear by the flow shadow.
  • each striking wheel web which is located radially on the inside and facing the striking surface, can be removed without removing the striking wheel from the fan mill and without dismantling further striking plates.
  • This enables a very quick and inexpensive disassembly and assembly of the inner blow bar.
  • the blow bar by removal is only one fastening part ⁇ usb ⁇ ub ⁇ r, the fastening part being a section of the striking plate holding strip on the ring disc side.
  • FIG. 2 shows a cross section according to section A-A in FIG. 1 of a striking wheel web with a striking plate set
  • FIG. 3 shows a further alternative embodiment to FIG. 2,
  • FIG. 4 shows a further alternative embodiment to FIG. 2,
  • FIG. 5 shows a further alternative embodiment to FIG. 2.
  • FIG. 6 shows a schematic representation of the state of wear over the operating time of a striking wheel with standard striking plates according to a prior art
  • FIG. 9 shows a schematic representation of the state of wear over the operating time of an impact wheel according to the invention
  • Fig. 10 diagram dependence of the mill output of a fan mill on the
  • FIG. 1 shows a vertical section of one half of the impact wheel 2 according to the invention of a fan mill 1, not shown.
  • the beater wheel 2 in a coal dust fan mill 1 is used for grinding and processing coal into coal dust and for conveying the coal dust into the coal dust combustion of a steam generator, since the rotating beater wheel 2 also exerts a ventilation effect and thus a promotional effect in addition to the comminution effect.
  • the comminution of the coal, in particular raw lignite in a coal dust fan mill is carried out in such a way that a beater wheel 2 rotating about the beater wheel axis 14 smashes the coal supplied for it.
  • the striking wheel 2 consists essentially of the striking wheel hub 3 and a striking wheel ring 4 and webs 5 which are inserted between the radially outer part of the striking wheel hub 3 and the striking wheel ring 4.
  • striking plate sets 6 are arranged, which comprise at least two striking plates 8, 9 and essentially radially from the inside out, ie. H. Striking plate 8 inside and striking plate 9 are arranged radially on the outside, on the web 5.
  • the front i.e.
  • the surface of the striking plate set 6 pointing in the direction of rotation of the striking wheel 2 forms the striking surface 12 and the surface of the striking plate set 6 pointing radially inward toward the striking wheel axis 14 forms the striking surface 1 6 of the respective striking plates 8, 9 of each striking wheel web 5.
  • the respective radially inner striking plate 8 is formed in the region of the striking edge 17 formed by its striking surfaces 12, 16 with a striking bar 7, which is formed over the length on the cross-sectional side at least over part of the cross section with a highly wear-resistant material and this part of the cross section forms the edge area 15 of the blow bar 7 delimiting the striking surfaces 12 and 16 (FIGS. 1 to 5).
  • the edge region 15 of the blow bar 7 can preferably have a thickness or depth of 1 to 50 mm, measured from the outer edge of the blow bar 7.
  • the striking plates 8, 9 associated with the respective web 5 are formed from a ductile material, since the wear on the radially outer parts of the striking wheel 2 is comparatively lower and the use of costly, highly wear-resistant materials can be saved.
  • the blow bar 7, as mentioned above, can be formed with a highly wear-resistant material only at the adjacent edge region 15 of the striking surfaces 12 and 16, however, in the embodiment of the invention, it can be completely, i.e. over the full cross section, made of a highly wear-resistant material, for example a composite material with a ductile metal matrix and hard metal particles embedded therein, or an MMC composite material (Matrix Metal Composite) with ceramic particles embedded therein.
  • the blow bar 7 can be formed from a ductile base material with surface hard metal armor on the striking surfaces 12 and 16 or the material of the highly wear-resistant blow bar 7 can be provided with sufficient ductile properties, i.e. be sufficiently insensitive to breakage when exposed to foreign bodies.
  • the striking bar 7 located radially on the inside can either lie directly against the web 5 or, as shown in FIG. 2, be inserted into a recess 13 in the adjacent striking plate 8 and point towards the striking surface 12 and 16.
  • the striking bar 7 protrudes stepwise from the striking surface 12 of the striking plate 8, 9 by a distance s, so that the less wear-resistant striking plates 8, 9 lie in the flow shadow of the striking bar 7 and are therefore less stressed by the regrind.
  • the striking bar 7 can protrude inwards towards the striking wheel axis 14 opposite the striking surface 16 of the adjacent striking plate 8 - if present in FIG.
  • the beating bar 7 can be designed as a rod with a rectangular cross section according to FIGS. 1 and 2 and can be inserted between the beater wheel hub 3 and beater wheel ring 4.
  • other cross sections are also possible, for example an L cross section according to FIGS. 3 and 5 or an essentially triangular cross section according to FIG. 4.
  • a blow bar 7 designed in this way can either be inserted into a recess 13 in the adjacent blow plate 8 (FIGS. 3 and 4). or placed on top of it ( Figure 5).
  • the blow bars 7 can be removed and installed very easily and quickly by the impact wheel 2 without removing the complete set of blow plates 6. This can take place even when the impact wheel 2 is still warm.
  • a striking plate fastening part 11 is provided separately on the striking wheel ring 4, which is usually a section of the striking plate holding strip 10 on the ring disk side and which only locks and fixes the striking strip 7 on the striking wheel 2.
  • the impact bar 7, which is held on the hub side of the impact wheel 2 by a plug connection can be pulled axially out of the plug connection of the hub 3 and then exchanged or replaced or prepared for further use.
  • the remaining striking plates 8, 9 are held separately by the aforementioned holding strip 10 and do not have to be exchanged in most cases when the striking strip 7 is replaced.
  • the beater bar 7 can be designed over its length either with an unequal cross-section or an unequal hard metal armor layer thickness in accordance with or in adaptation to the expected millbase flow-through profile.
  • a larger cross section or a thicker hard metal armor layer can be provided at the points of the blow bar 7 of each impact wheel web that are particularly susceptible to wear, and the operating time of the impact wheel 2 can be increased.
  • FIG. 10 shows a St ⁇ nd ⁇ rd-Schl ⁇ gpl ⁇ tte or Schl ⁇ gpl ⁇ ttens ⁇ tz according to the prior art with a thickness m and different degrees of wear I, II and III.
  • the curve with degrees of wear I, II and III shows the course of the mill output as a function of the operating time and the state of wear of this set of striking plates.
  • degree of wear I the corner of the striking plate is slightly worn, with II up to the rear corner on the web and with III the thickness m of the plate is already severely attacked or reduced.
  • FIG. 8 also shows a known prior art, in which case the standard striking plate or the striking plate set has hard metal armor on the striking surface 12 and 16.
  • the course of the curve with the degrees of wear I *, II * and III * showing the dependency of the mill output in relation to the beater wheel operating time and the wear state of the beater plates according to FIG. 8 is again recorded in FIG. 10, it being evident that the Mill output can be kept high much longer. Only after the hard metal armor has worn down on the inner edge of the impact plate - for example from wear level I * - does the mill's performance drop sharply. The service life of these impact plates has been reached at point III *. The striking plates must then be replaced.
  • FIG. 9 shows the degree of wear and the operating time of the impact plates of an impact wheel according to the invention, which is dependent on this. From curve “C” it can be seen that the mill output can be kept very high over a considerably longer operating time and drops only insignificantly over the operating time.
  • the striking plate set 6 according to FIG Striking plate 8 protrudes stepwise and their entire cross section consists of highly wear-resistant material. With degree of wear I **, the radially inner edge 17 of the blow bar 7 facing the striking surface 12 is worn off. However, since the performance of the impact wheel 2 has hardly decreased, the fan mill can continue to be operated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

L'invention concerne une roue broyeuse destinée à un broyeur à ventilateur, en particulier pour le broyage de charbon destiné à un foyer à poussière de charbon d'un générateur de vapeur. Sur la périphérie de cette roue broyeuse sont disposées, à des intervalles réguliers, plusieurs nervures (5) qui s'étendent entre le moyeu de roue broyeuse (3) et la bague de roue broyeuse (4) et sont armées, dans le sens de rotation de la roue broyeuse, chacune par plusieurs plaques de broyage (98) parallèles à l'axe de la roue broyeuse. Chaque plaque de broyage (8), s'étendant radialement vers l'intérieur, comporte, dans la zone du bord de broyage (17) formée par ses faces de broyage (12, 16), une barre de broyage (7). Cette dernière est, sur sa longueur, en coupe transversale, au moins sur une partie de la coupe transversale, constituée d'un matériau hautement résistant à l'usure, et cette partie de coupe transversale forme la zone de bord (15) de la barre de broyage (7) qui délimite les faces de broyage (12, 16).
PCT/DE2001/003999 2000-10-28 2001-10-17 Roue broyeuse pour broyeur a ventilateur Ceased WO2002034394A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002215825A AU2002215825A1 (en) 2000-10-28 2001-10-17 Beater wheel for an integral-fan mill

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10053652.2 2000-10-28
DE2000153652 DE10053652C2 (de) 2000-10-28 2000-10-28 Schlagrad für eine Ventilatormühle

Publications (1)

Publication Number Publication Date
WO2002034394A1 true WO2002034394A1 (fr) 2002-05-02

Family

ID=7661487

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/003999 Ceased WO2002034394A1 (fr) 2000-10-28 2001-10-17 Roue broyeuse pour broyeur a ventilateur

Country Status (3)

Country Link
AU (1) AU2002215825A1 (fr)
DE (1) DE10053652C2 (fr)
WO (1) WO2002034394A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2825316B1 (fr) 2012-03-15 2017-04-26 Maschinenfabrik Köppern GmbH & Co. KG Rouleau de presse
WO2020239269A1 (fr) * 2019-05-30 2020-12-03 General Electric Technology Gmbh Plaque de marteau pour ensemble broyeur à marteaux

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10688498B2 (en) 2017-11-14 2020-06-23 General Electric Technology Gmbh Beater wheel for pulverizer mill and method of assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307845A (en) * 1976-03-23 1981-12-29 United States Steel Corporation Striker bar for rotary cage grinder
EP0785024A1 (fr) * 1996-01-12 1997-07-23 SWB Stahlformgussgesellschaft mbH Dispositif de broyage de matières solides
DE19622914A1 (de) * 1996-06-07 1997-12-11 Verschleis Technik Dr Ing Hans Schlagplatte für eine Schlagradmühle
DE29806686U1 (de) 1998-04-15 1998-07-02 Steinmüller-Instandsetzung Kraftwerke Gesellschaft für Energie- und Umwelttechnik mbH, 03185 Peitz Schlagrad für eine Kohlemühle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE699460C (de) * 1939-07-02 1940-11-29 Kohlenscheidungs Ges M B H Schlaegerrad fuer Schlagradmuehlen
US2830773A (en) * 1956-06-05 1958-04-15 Kohlenscheidungs Gmbh Beater wheel mill
DE19622913A1 (de) * 1996-06-07 1997-12-11 Verschleis Technik Dr Ing Hans Schlagplatte für eine Schlagradmühle
DE19718837A1 (de) * 1997-05-06 1998-11-19 Kronenberger Ernst Josef Dipl Zerkleinerungselemente für Schredder-Rotoren in Form von Hämmern oder Schlegeln

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307845A (en) * 1976-03-23 1981-12-29 United States Steel Corporation Striker bar for rotary cage grinder
EP0785024A1 (fr) * 1996-01-12 1997-07-23 SWB Stahlformgussgesellschaft mbH Dispositif de broyage de matières solides
DE19622914A1 (de) * 1996-06-07 1997-12-11 Verschleis Technik Dr Ing Hans Schlagplatte für eine Schlagradmühle
DE29806686U1 (de) 1998-04-15 1998-07-02 Steinmüller-Instandsetzung Kraftwerke Gesellschaft für Energie- und Umwelttechnik mbH, 03185 Peitz Schlagrad für eine Kohlemühle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2825316B1 (fr) 2012-03-15 2017-04-26 Maschinenfabrik Köppern GmbH & Co. KG Rouleau de presse
WO2020239269A1 (fr) * 2019-05-30 2020-12-03 General Electric Technology Gmbh Plaque de marteau pour ensemble broyeur à marteaux

Also Published As

Publication number Publication date
DE10053652A1 (de) 2002-05-16
AU2002215825A1 (en) 2002-05-06
DE10053652C2 (de) 2003-02-20

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Legal Events

Date Code Title Description
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase