EP1955772A2 - Broyeur pour une centrale électrique - Google Patents

Broyeur pour une centrale électrique Download PDF

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Publication number
EP1955772A2
EP1955772A2 EP08100832A EP08100832A EP1955772A2 EP 1955772 A2 EP1955772 A2 EP 1955772A2 EP 08100832 A EP08100832 A EP 08100832A EP 08100832 A EP08100832 A EP 08100832A EP 1955772 A2 EP1955772 A2 EP 1955772A2
Authority
EP
European Patent Office
Prior art keywords
impact
cavity
wear
cavities
grinder
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
EP08100832A
Other languages
German (de)
English (en)
Other versions
EP1955772B1 (fr
EP1955772A3 (fr
Inventor
Peter Helmut Breuhaus
Jaroslaw Szwedowicz
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.)
General Electric Technology GmbH
Original Assignee
Alstom Technology AG
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 Technology AG filed Critical Alstom Technology AG
Priority to PL08100832T priority Critical patent/PL1955772T3/pl
Publication of EP1955772A2 publication Critical patent/EP1955772A2/fr
Publication of EP1955772A3 publication Critical patent/EP1955772A3/fr
Application granted granted Critical
Publication of EP1955772B1 publication Critical patent/EP1955772B1/fr
Not-in-force legal-status Critical Current
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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B02C13/1835—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/01—Indication of wear on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the invention relates to a grinder for a power plant, in particular a beater mill for a coal power plant.
  • the invention also relates to a method for producing a plurality of cavities and at least one connecting cavity connecting these cavities in a grinder.
  • the invention relates to a power plant equipped with a grinding device according to the invention.
  • the coal used for firing is usually ground.
  • so-called beater wheel mills which have a grinding tool rotating at up to 1,500 revolutions per minute.
  • the coal is thereby comminuted by the impact and impact effect within the rotating impact or grinding tool in the often armored mill housing.
  • the crushed by the beater mill fuel is often fed through a solids blower, which also causes additional drying of the fuel, a furnace of the power plant.
  • the invention deals with the problem of providing for a grinder an improved or at least another embodiment, which is particularly characterized in that a degree of wear of the grinding tool can be detected and evaluated, thereby replacing the Grinding tool or arranged thereon impact / impact elements can be made as needed.
  • the invention is based on the general idea to provide a control device which monitor a degree of wear of the grinding tool and can generate appropriate signals as needed.
  • Mahl in this case has a rotating grinding tool and a surrounding this Mahlgephaseuse, wherein the grinding tool abnutzendes impact / impact elements are arranged during operation of the grinder.
  • At least one of these impact / impact elements at least one cavity is provided, which is acted upon by internal pressure and which is spaced apart to a wear-exposed side of the impact / impact element is arranged in such a way that at a defined degree of wear, an opening of the cavity.
  • the cavity communicating with a at least the pressure in the cavity detecting control device is connected.
  • the cavity and the control device form a closed pressurizable system, which is only opened by appropriate wear of the impact / impact elements. If a removal of the impact / impact elements has progressed so far that the cavity is opened on the side exposed to wear, the pressure in the cavity drops, which can be detected by the control device.
  • the pressure drop can trigger, for example, a first warning signal, as with the opening of the cavity a related degree of wear is reached.
  • the invention offers the great advantage that the grinding tool can be operated until the opening of the at least one cavity, without the fear that material-related failures will occur.
  • the degree of wear of the impact / impact elements has reached a certain value, in which, for example, an exchange of the associated impact / impact element must take place.
  • an operating time can be set at least approximately.
  • a plurality of cavities are provided with a different distance to a wear-exposed side of the impact / impact element in at least one impact / impact element.
  • the cavities are opened one after the other, thereby creating a stepped control system. If, for example, three cavities are provided, each with a different distance from the wear-exposed side of the impact / impact element, at a certain degree of wear initially only that cavity is opened whose distance to the wear-exposed side of the impact / impact element is lowest. If, during further operation, the second cavity is then opened, this is a clear indicator of an imminent replacement of the impact / impact elements.
  • the control device detects a stepped pressure drop or a stepped mass / volume flow from the pressurized cavity to the outside, as a result of which the respectively associated degree of wear is simple and nevertheless very precisely detectable.
  • the thus formed and arranged cavities thus form a simple and accurate together with the control device operating early warning system, whereby the maintenance and the associated downtime of the grinder can be better and thus controlled more economically.
  • the at least one cavity is acted on by a gas, in particular by air, or by a liquid, in particular by water pressure.
  • a gas in particular by air
  • a liquid in particular by water
  • a pressure drop is detectable.
  • Corresponding Fig. 1 has a grinding device 1 according to the invention for a power plant, not shown, which may be formed, for example, as a beater wheel for a coal power plant, a rotating grinding tool 2 and a surrounding this grinding housing 3.
  • Both the grinding tool 2 and the grinding housing 3 consist of a very abrasion-resistant or resistant material and can in particular be armored, since during operation of the grinding device 1 considerable wear forces act on the grinding tool 2.
  • coal is finely ground, for example, to improve a subsequent combustion in the power plant.
  • the comminuting effect is generated by so-called impact / impact elements 4, which are arranged on the rotating grinding tool 2 and which wear in not unerblichem extent during operation of the grinder 1.
  • a degree of wear depends in particular on a proportion of impurities in the coal, such as sand, from, so that depending on the composition of the coal to be ground life expectancy in particular the impact and baffle elements 4 may be different lengths. This results in the problem that a maintenance or a replacement interval of the impact / impact elements 4 is difficult to predict.
  • At least one cavity 5 (see FIG. 2) is provided in at least one impact element 4.
  • Fig. 2 which is aufschlagbar with an internal pressure and which is spaced to a wear-exposed side 6 of the impact / impact element 4 is arranged. If, during operation of the grinding device 1, the wear-exposed side 6 of the impact / impact element 4 is subjected to increasing erosion / wear, the wear eventually reaches the cavity 5 and opens it, the exact distance between the side 6 and the cavity 5 a degree of wear is exactly predictable or fixable.
  • the cavity 5 is opened, there is an escape of the pressure stored therein, which is detected by a control device, not shown, which is communicatively connected to the at least one cavity 5.
  • Fig. 2 According to the impact / impact element 4 off Fig. 2 are a total of three cavities 5, 5 ', 5 "provided, which at the in Fig. 2 shown embodiment run parallel and extend in wear direction 7.
  • a distance between the side 6 and the connecting cavity 8 is denoted by L and the respective longitudinal extent of the individual cavities 5", 5 'and 5 h 1 , h 2 , h 3 .
  • Lh 3 the distance between the wear-exposed side 6 Lh 3 , while a distance between the wear-exposed side 6 and the Cavity 5 "Lh 1. Since h 1 is significantly smaller than h 3 , the distance Lh 3 is significantly smaller than the distance Lh 1 .
  • the control device 9 is expediently designed to monitor a mass flow and / or a volumetric flow and / or a pressure drop which occurs as a result of a cavity 5, 5 ', 5 "opened by a corresponding degree of wear Cavity 5, the pressure drop or a leakage current is significantly lower than is the case with equally open cavities 5, 5 ', 5 "the case. On the size of the leakage current thus the degree of wear of the impact / impact elements 4 can be determined. Also the Fig. 2 it can be seen that the connecting cavity 8 connecting the cavities 5, 5 ', 5 "is orthogonal to the cavities 5, 5', 5".
  • the invention provides for the cavities 5, 5 ', 5 "and the connecting cavity 8 to be pressurized, wherein as a pressure medium, for example, a gas, in particular air, or a liquid, in particular water, may be provided Beater wheel mill, which is used for coal grinding, is preferred as the pressure medium, for example water, since air constitutes an oxidizer and increases the latent risk of explosion is tuned.
  • a pressure medium for example, a gas, in particular air, or a liquid, in particular water
  • Beater wheel mill which is used for coal grinding, is preferred as the pressure medium, for example water, since air constitutes an oxidizer and increases the latent risk of explosion is tuned.
  • FIG. 3a to 3c an inventive method for producing at least one cavity 5 and at least one connecting cavity 8 in a grinder 1 according to the invention is shown.
  • the connecting cavity 8 is introduced into the impact / impact element 4, in particular lasered or drilled.
  • the connecting cavity 8 extends substantially parallel to the wear-exposed side 6.
  • the at least one cavity 5 is introduced into the impact / impact element 4 in such a way, again lasered or drilled, that it intersects the connecting cavity 8.
  • further cavities can be introduced into the respective impact / impact element 4.
  • the cavity 5 ends at a distance from the wear-exposed side 6 of the impact / impact element 4.
  • the cavity 5 or other cavities are then closed so that they only pass over the at least one Connecting cavity 8 communicate with each other and / or with the control device 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP08100832.8A 2007-02-08 2008-01-23 Broyeur pour une centrale électrique Not-in-force EP1955772B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08100832T PL1955772T3 (pl) 2007-02-08 2008-01-23 Urządzenie mielące dla elektrowni

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2102007 2007-02-08

Publications (3)

Publication Number Publication Date
EP1955772A2 true EP1955772A2 (fr) 2008-08-13
EP1955772A3 EP1955772A3 (fr) 2008-08-27
EP1955772B1 EP1955772B1 (fr) 2013-07-17

Family

ID=38009759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08100832.8A Not-in-force EP1955772B1 (fr) 2007-02-08 2008-01-23 Broyeur pour une centrale électrique

Country Status (4)

Country Link
EP (1) EP1955772B1 (fr)
AU (1) AU2008200366B2 (fr)
DK (1) DK1955772T3 (fr)
PL (1) PL1955772T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022106573A1 (fr) * 2020-11-20 2022-05-27 Basf Se Broyeur à jet fluide

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314618A (en) * 1965-01-14 1967-04-18 Allis Chalmers Mfg Co Crushing chamber wear indicator
DD301325A7 (de) * 1990-01-02 1992-12-03 Energiewerke Schwarze Pumpe Ag,De Vorrichtung zur anzeige der grenznutzungsdauer von schlagraedern
US6129297A (en) * 1997-07-30 2000-10-10 Martin Marietta Materials, Inc. Cone crusher with wear indicator
JP2003225582A (ja) * 2002-02-05 2003-08-12 Komatsu Zenoah Co チッパ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314618A (en) * 1965-01-14 1967-04-18 Allis Chalmers Mfg Co Crushing chamber wear indicator
DD301325A7 (de) * 1990-01-02 1992-12-03 Energiewerke Schwarze Pumpe Ag,De Vorrichtung zur anzeige der grenznutzungsdauer von schlagraedern
US6129297A (en) * 1997-07-30 2000-10-10 Martin Marietta Materials, Inc. Cone crusher with wear indicator
JP2003225582A (ja) * 2002-02-05 2003-08-12 Komatsu Zenoah Co チッパ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022106573A1 (fr) * 2020-11-20 2022-05-27 Basf Se Broyeur à jet fluide

Also Published As

Publication number Publication date
PL1955772T3 (pl) 2013-11-29
EP1955772B1 (fr) 2013-07-17
AU2008200366A1 (en) 2008-08-28
EP1955772A3 (fr) 2008-08-27
AU2008200366B2 (en) 2012-02-23
DK1955772T3 (da) 2013-09-23

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