EP1955772B1 - Broyeur pour une centrale électrique - Google Patents
Broyeur pour une centrale électrique Download PDFInfo
- Publication number
- EP1955772B1 EP1955772B1 EP08100832.8A EP08100832A EP1955772B1 EP 1955772 B1 EP1955772 B1 EP 1955772B1 EP 08100832 A EP08100832 A EP 08100832A EP 1955772 B1 EP1955772 B1 EP 1955772B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cavity
- wear
- cavities
- impact
- grinding device
- 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.)
- Not-in-force
Links
Images
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 exposed to a gas, in particular to air, or to a liquid, in particular to water pressure.
- a pressure drop is detectable.
- a liquid, especially water is used, since it can lead to an increase in the risk of explosion when using an oxidizer, such as air, which is not to be feared when using water .
- the example shows, however, that the pressure medium within the cavities can be individually adapted to the respective requirements.
- 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)
Claims (10)
- Dispositif de broyage (1) pour centrale électrique, en particulier broyeur à roue de percussion pour centrale électrique à charbon, présentant un outil rotatif de broyage (2) entouré par un caisson de broyage (3),
l'outil rotatif de broyage (2) présentant des éléments de percussion (4) qui s'usent lors de l'utilisation du dispositif de broyage (1),
au moins une cavité (5, 5', 5") sur laquelle une pression intérieure peut être appliquée et disposée à distance d'un côté (6) de l'élément de percussion (4) exposé à l'usure de telle sorte que la cavité (5) s'ouvre à un degré d'usure défini étant prévue dans au moins un élément de percussion (4),
la ou les cavités (5) étant reliées à communication avec un dispositif de contrôle (9) qui saisit au moins la pression qui règne dans la cavité (5). - Dispositif de broyage selon la revendication 1, caractérisé en ce que la ou les cavités (5) s'étendent dans la direction d'usure (7) de l'élément de percussion (4).
- Dispositif de broyage selon les revendications 1 ou 2, caractérisé en ce que plusieurs cavités (5, 5', 5") qui présentent différentes distances par rapport au côté (6) de l'élément de percussion (4) exposé à l'usure sont prévues dans au moins un élément de percussion (4).
- Dispositif de broyage selon l'une des revendications 1 à 3, caractérisé en ce qu'au moins deux cavités (5, 5') sont reliées l'une à l'autre à communication par une cavité de liaison (8) qui est reliée à communication au dispositif de contrôle (9).
- Dispositif de broyage selon l'une des revendications 1 à 4, caractérisé en ce que le dispositif de contrôle (9) est configuré pour surveiller le débit massique, le débit volumique et/ou la perte de charge qui s'établit suite à l'ouverture d'une cavité (5, 5', 5") qui s'ouvre à un degré d'usure correspondant.
- Dispositif de broyage selon l'une des revendications 1 à 5, caractérisé en ce qu'au moins deux cavités (5, 5') s'étendent essentiellement parallèlement l'une à l'autre tandis que la cavité de liaison (8) qui relie l'une à l'autre les cavités (5, 5') s'étend perpendiculairement à ces dernières.
- Dispositif de broyage selon l'une des revendications 1 à 6, caractérisé en ce qu'un gaz, en particulier l'air, ou un liquide, en particulier l'eau, peuvent être appliqués dans la ou les cavités (5, 5', 5").
- Procédé de fabrication de plusieurs cavités (5) ainsi que d'au moins une cavité de liaison (8) qui relie ces cavités dans un dispositif de broyage (1) selon l'une des revendications 1 à 7, et dans lequel la cavité de liaison (8) est d'abord ménagée dans l'élément de percussion (4), au moins deux des cavités (5) qui croisent la cavité de liaison (8) étant ensuite ménagées dans l'élément de percussion, les cavités (5) se terminant à distance du côté (6) de l'élément de percussion (4) exposé à l'usure, les cavités (5) étant ensuite fermées de manière à communiquer les unes avec les autres par la ou les cavités de liaison (8) et avec le dispositif de contrôle (9).
- Procédé selon la revendication 8, caractérisé en ce qu'au moins une cavité (5) et/ou au moins une cavité de liaison (8) sont forées ou formées au laser.
- Centrale électrique, en particulier centrale électrique à charbon, dotée d'un dispositif de broyage (1) selon l'une des revendications 1 à 7.
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 EP1955772A2 (fr) | 2008-08-13 |
EP1955772A3 EP1955772A3 (fr) | 2008-08-27 |
EP1955772B1 true 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) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116033969A (zh) * | 2020-11-20 | 2023-04-28 | 巴斯夫欧洲公司 | 喷射磨 |
Family Cites Families (4)
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 |
-
2008
- 2008-01-23 PL PL08100832T patent/PL1955772T3/pl unknown
- 2008-01-23 DK DK08100832.8T patent/DK1955772T3/da active
- 2008-01-23 EP EP08100832.8A patent/EP1955772B1/fr not_active Not-in-force
- 2008-01-24 AU AU2008200366A patent/AU2008200366B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
PL1955772T3 (pl) | 2013-11-29 |
AU2008200366A1 (en) | 2008-08-28 |
EP1955772A3 (fr) | 2008-08-27 |
AU2008200366B2 (en) | 2012-02-23 |
DK1955772T3 (da) | 2013-09-23 |
EP1955772A2 (fr) | 2008-08-13 |
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