EP0745427A1 - Ueberwachungsvorrichtung für Kugelmühlen - Google Patents

Ueberwachungsvorrichtung für Kugelmühlen Download PDF

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Publication number
EP0745427A1
EP0745427A1 EP96401133A EP96401133A EP0745427A1 EP 0745427 A1 EP0745427 A1 EP 0745427A1 EP 96401133 A EP96401133 A EP 96401133A EP 96401133 A EP96401133 A EP 96401133A EP 0745427 A1 EP0745427 A1 EP 0745427A1
Authority
EP
European Patent Office
Prior art keywords
balls
mill
coal
receiver
electronic circuit
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
EP96401133A
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English (en)
French (fr)
Other versions
EP0745427B1 (de
Inventor
Daniel Fontanille
Jacques Barbot
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.)
Alstom Power Boiler SA
Original Assignee
GEC Alsthom Stein Industrie
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Publication of EP0745427A1 publication Critical patent/EP0745427A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/1805—Monitoring devices for tumbling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating

Definitions

  • the present invention relates to a device for monitoring a ball mill.
  • It relates more precisely to a device for monitoring a ball mill with a cylindrical casing, containing a mass of balls which are arranged during the rotation of the mill at its normal speed between two generators (1 b , 1 b ') spaced apart by a minimum angle ⁇ min and a maximum angle ⁇ max and a mass of coal which is disposed during the rotation of the mill at its normal speed between two generators (1 c , 1 c ') spaced by an angle ⁇ .
  • a first system is based on the variation of the measurement of the power absorbed by the electric motor causing the rotation of the ball mill. This method is not very sensitive; in addition, it requires frequent recalibration according to the wear of the balls or the addition of new balls.
  • level probes Pneumatic probes, each comprising a pneumatic hose, one end of which is inserted inside the mill, make it possible to carry out measurements of the pressure difference existing between two levels; we can deduce the amount of coal in the grinder.
  • the level sensors are installed in a hostile environment (carbon dust, falls balls, risk of blockage, etc ...) making the risk of breakdowns significant; the probes are connected to a complex pneumatic cabinet, therefore expensive, costly to maintain. The availability of such a system is average.
  • Another system is based on measuring the noise emitted by the mill.
  • This method has the disadvantage of providing a signal which is very dependent on the flow rate of the mill, the size of the pieces of coal introduced, the quantity of balls present in the mill and the wear of the armor plates fitted to the internal walls of the mill. .
  • the object of the invention is to provide a monitoring device for a ball mill, which allows continuous control of these three parameters (quantity of coal, quantity of balls, wear of the casing) using sensors external to the polluting atmosphere inside the grinder and independent of the grinding medium.
  • the device according to the invention also allows a direct measurement of these parameters which is reliable.
  • the monitoring device comprises a wave transmitter, chosen from electromagnetic waves, placed inside the mill and at least one wave receiver placed outside the envelope, the receiver being associated with an electronic circuit for determining at least one parameter of the mill chosen from the quantity of balls, quantity of coal and wear of the envelope.
  • the receiver in order to monitor the quantity of balls, it comprises at least one wave receiver arranged opposite the generator l b and at least one wave receiver arranged opposite the generator l b ', corresponding to the angle ⁇ min , the receiver being associated with an electronic circuit for determining the quantity of balls.
  • the envelope in order to monitor the wear of the envelope, it comprises at least one wave receiver arranged outside the angular sectors ⁇ max and ⁇ , the receiver being associated with an electronic determination circuit the wear of the envelope.
  • the receiver in order to monitor the quantity of coal, it comprises at least one wave receiver arranged in the angular sector ⁇ not common to the angular sector ⁇ max , the receiver being associated with an electronic circuit for determining the quantity of coal.
  • the receiver in order to monitor the three parameters, it comprises at least one wave receiver arranged rotatably around the longitudinal axis of the envelope on an angular sector ⁇ greater than the angular sector encompassing ⁇ and ⁇ , the receiver being associated with an electronic circuit for determining the wear of the shell of the mill, the quantity of balls and the quantity of coal, the ball mill containing a mass of balls being arranged during the rotation of the mill its normal speed between two generators (l b , l b ') spaced by an angle ⁇ and a mass of coal disposing during rotation of the mill at its normal speed between two generators (l c , l c ') spaced by an angle ⁇ .
  • the transmitter is arranged on the longitudinal axis of the mill.
  • the emitter is a gamma photon emitter.
  • the electronic circuit for determining the quantity of balls comprises associated with each receiver a converter and a linearizer, the signals of each linearizer being associated to carry out the calculation of the quantity of balls.
  • the electronic circuit for determining the wear of the envelope, for its part, comprises a converter associated with a device for reading the degree of wear.
  • the electronic circuit for determining the quantity of coal, for its part comprises a converter whose signal is corrected by the wear signal of the envelope measured previously.
  • Figure 1 is a longitudinal sectional view of a coal grinding installation provided with the monitoring device according to the invention.
  • Figure 2 is a sectional view along line II-II of Figure 1 of a first embodiment of the monitoring device according to the invention.
  • Figure 3 is an electronic circuit diagram of the monitoring device according to the invention.
  • Figure 4 is a sectional view along line II-II of Figure 1 of a second embodiment of the monitoring device according to the invention.
  • FIG. 5 is a graph representing the monitoring signal obtained using the device shown in FIG. 4.
  • FIG. 1 schematically represents a coal grinding installation comprising at least one feed device 10 supplying coal to a ball mill generally designated by the reference 20.
  • the feed device 10 comprises a storage hopper 1 from which the coal 2 is extracted, which is brought by a chain conveyor 3 placed in a box 4 and driven by a motor 5, at a first end of a vertical pipe 6.
  • the crusher 20 comprises a cylindrical metallic envelope or ferrule 11 terminated by two conical portions 12 and 13 to which are fixed respectively two pins 14 and 15 intended to support the ferrule.
  • the pins are placed respectively on two bearings 16 and 17 provided with bearings.
  • the crusher is rotated by means of a toothed ring 18 cooperating with a pinion not shown driven by an electric geared motor not shown.
  • tubular portions 21 and 22 respectively provided with a coaxial elastic Archimedes screw 23 and 24 and driven in rotation with the crusher.
  • Hot air is introduced through pipes 25 and 26 respectively inside the tubular portions 21 and 22 under a pressure of a few tens of hectopascals.
  • the coal arrives by gravity through the pipe 6, the second end of which opens out in line with the tubular portion 22.
  • the coal also arrives on the other tubular portion 21 via a pipe 16 'from another non-feeding device. represented.
  • the coal is entrained inside the mill by the rotation of the Archimedes screws 23 and 24.
  • the mill is lined with balls 27, for example of steel.
  • the balls crush the coal; the fine particles of carbon are entrained by hot air, in the annular spaces 28, 29 included respectively between the ferrules 14, 15 and the tubular portions 21, 22, and evacuated towards the burners by conduits 30 and 31.
  • the monitoring device comprises a wave emitter 33, chosen from electromagnetic waves, disposed inside the envelope 11. It is fixed and rotatably supported for example in a socket carried by an arrangement of stays 36 welded to inside the tube carrying the Archimedes screw 23.
  • a wave emitter 33 chosen from electromagnetic waves
  • the monitoring device is arranged on the longitudinal axis of the envelope 11.
  • it is a transmitter of gamma photons.
  • a support assembly of receivers 34 arranged outside the envelope 11 and which will be specified below.
  • Figure 2 is an enlarged sectional view of the envelope, in operation.
  • the mass of balls 27 offset by the rotation of the casing 11 in the direction of the arrow.
  • the mass of coal 32 resulting from the grinding overcomes this mass 27.
  • the mass of balls 27 is arranged during the rotation of the mill at its normal speed between two generators l b , l b 'spaced by an angle ⁇ comprised between a minimum angle ⁇ min and a maximum angle ⁇ max .
  • the coal mass 32 is arranged during the rotation of the mill at its normal speed between two generators l c , l c 'spaced at an angle ⁇ .
  • the transmitter 33 scans a beam of waves inside the envelope 11.
  • the signals generated by the receivers 34A and 34B make it possible to know the total absorption zone due to the presence of the balls 27 or at least to check that this area is greater than the minimum allowable area.
  • the signal generated by the receiver 34C makes it possible to measure the wear of the envelope 11 by determining the variation in absorption as a function of the thickness of the envelope 11.
  • the signal generated by the receiver 34D makes it possible to measure the quantity of carbon 32 by determining the variation in absorption through this mass 32, taking into account the variation due to the thickness of the envelope 11 determined by means of the receiver 34C.
  • FIG. 3 schematically represents an example of an electronic circuit for measuring the three parameters.
  • the electronic circuit for determining the quantity of balls comprises associated with each receiver 34A, 34B a converter 40A, 40B and a linearizer 41A, 41B, the signals of each linearizer 41A, 41B being associated by summation 42A then linearized 43A to perform the calculation of the quantity of balls 27 transmitted on a reading device 44A.
  • the electronic circuit for determining the wear of the envelope comprises a converter 40C associated with a device for reading the degree of wear 44C.
  • the electronic circuit for determining the quantity of coal comprises a converter 40D, the signal of which is corrected by differentiation by the wear signal 41D of the casing 11 measured at the output of the converter 40C.
  • FIG. 4 A second embodiment is shown in FIG. 4.
  • a wave receiver 34 disposed outside the envelope 11 rotates at a speed ⁇ around the longitudinal axis of the envelope 11 over an angular sector ⁇ greater than the angular sector encompassing ⁇ and ⁇ , the receiver 34 being associated with an electronic circuit for determining the wear of the shredder shell, the quantity of balls and the quantity of coal.
  • the elements to be monitored and observed are "scanned" using a position indexing system depending on the areas to be observed and the type of measurement to be performed.
  • FIG. 5 An example of a signal obtained using this monitoring device is shown in FIG. 5.
  • This signal represents the amplitude A of the wave received by the receiver 34 as a function of its position x when it traverses the angular sector ⁇ at the speed ⁇ .
  • the first zone D1 makes it possible to follow the wear of the envelope 11, by determining the evolution of the curve.
  • the curve C2 represents a degree of wear with respect to the initial curve C1.
  • the second zone D2 makes it possible to control the quantity of carbon by monitoring the attenuation of the signal as a function of the abscissa x1.
  • Curve C1 ′ shows the evolution of the signal in the case of an empty mill, the set of curves C1 giving the appearance of this same signal as a function of filling with coal.
  • the third zone D3 makes it possible to control the quantity of balls 27 by measuring its length on the abscissa.
  • curve C2 represents a reduction in this quantity of balls compared to the initial curve C1.
  • such a signal can be read and thus allows the continuous monitoring of the three parameters which are the wear of the envelope, the quantity of coal and the quantity of balls of the grinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Metal Rolling (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP96401133A 1995-06-01 1996-05-24 Ueberwachungsvorrichtung für Kugelmühlen Expired - Lifetime EP0745427B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9506523A FR2734739B1 (fr) 1995-06-01 1995-06-01 Dispositif de surveillance d'un broyeur a boulets
FR9506523 1995-06-01

Publications (2)

Publication Number Publication Date
EP0745427A1 true EP0745427A1 (de) 1996-12-04
EP0745427B1 EP0745427B1 (de) 2000-05-10

Family

ID=9479582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96401133A Expired - Lifetime EP0745427B1 (de) 1995-06-01 1996-05-24 Ueberwachungsvorrichtung für Kugelmühlen

Country Status (10)

Country Link
US (1) US5698797A (de)
EP (1) EP0745427B1 (de)
CN (1) CN1142988A (de)
AT (1) ATE192670T1 (de)
CA (1) CA2177932A1 (de)
DE (1) DE69608163T2 (de)
DK (1) DK0745427T3 (de)
ES (1) ES2147905T3 (de)
FR (1) FR2734739B1 (de)
ZA (1) ZA957979B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105300473A (zh) * 2015-11-25 2016-02-03 太原理工大学 一种少量标定的基于深度信念网络的球磨机料位测量方法

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1014486A3 (fr) 2001-11-22 2003-11-04 Magotteaux Int Procede d'evaluation du taux de remplissage d'un broyeur rotatif tubulaire et dispositif pour sa mise en oeuvre.
FI115854B (fi) * 2003-01-17 2005-07-29 Outokumpu Oy Menetelmä myllyn täyttöasteen määrittämiseksi
DE102004015057A1 (de) * 2004-03-25 2005-10-20 Siemens Ag Verfahren, Steuervorrichtung und Antriebsvorrichtung zum Lösen einer festgeklebten Ladung von der Innenwand eines Mahlrohrs
AU2007216691A1 (en) * 2006-09-11 2008-04-03 Universidad Tecnica Federico Santa Maria Intelligent monitoring system and method for mill drives in mineral grinding processes
EP2347828A1 (de) * 2010-01-21 2011-07-27 ABB Schweiz AG Verfahren und Vorrichtung zur Entfernung einer festgeklebten Ladung aus einer Rohrmühle
DE102010064263A1 (de) 2010-07-29 2012-02-02 Siemens Aktiengesellschaft Anordnung, Betriebsverfahren und Schaltung für eine Ringmotor-getriebene Mühle
CL2010001433A1 (es) 2010-12-14 2012-10-05 Univ Santiago Chile Sistema para monitorizar en tiempo real el desgaste del espesor de los nervios de una parrilla de un molino sag, producido por la acción abrasiva de la pulpa del mineral y de los elementos de la molienda durante la operación; y método de calibración del sistema.
CL2010001649A1 (es) 2010-12-31 2013-01-18 Univ Santiago Chile Sistema y metodo de medicion en tiempo real del flujo de material de descarga desde un molino de minerales.
US9849460B2 (en) 2011-11-10 2017-12-26 Sociedad De Innovacion Y Transferencia Tecnologica Limitada Direct visual monitoring method and system for sensing the interior of a rotary mineral mill
CN102788612B (zh) * 2012-03-09 2014-12-17 山东理工大学 球磨机内部球石群及块状矿料动态分布检测系统及方法
CN104903349B (zh) 2012-11-08 2018-10-19 十一生物治疗股份有限公司 Il-6拮抗剂及其应用
KR101341444B1 (ko) * 2012-12-07 2013-12-13 한국지질자원연구원 석탄층메탄가스 잔류량 측정 시스템
CN103934068B (zh) * 2014-05-15 2017-01-11 海安县晋全电工器材有限公司 一种带便捷卸料装置的球磨机
KR102636726B1 (ko) 2014-11-07 2024-02-13 에프. 호프만 라-로셰 엘티디 향상된 il-6 항체
CL2015001220A1 (es) 2015-05-07 2015-10-09 Univ Técnica Federico Santa María Un sistema y método para la estimación en linea del nivel de llenado de bolas y nivel de carga en un molino rotatorio
EP3097979A1 (de) * 2015-05-28 2016-11-30 ABB Technology AG Verfahren zur bestimmung eines hubwinkels und verfahren zur positionierung einer mühle
US10399089B1 (en) * 2016-01-12 2019-09-03 Sheldon Dean Shumway System to control a charge volume of an autogenous mill or a semi-autogenous mill
AU2017223687A1 (en) 2016-02-23 2018-08-09 Sesen Bio, Inc. IL-6 antagonist formulations and uses thereof
CN106423407A (zh) * 2016-12-05 2017-02-22 江苏吉星光通讯科技有限公司 可实现自动检测的热矿破碎设备
CN109046739B (zh) * 2018-09-30 2020-08-21 中信重工机械股份有限公司 一种球磨机在线监控及故障处理帮助系统

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Publication number Priority date Publication date Assignee Title
DE1607581A1 (de) * 1967-04-26 1969-09-18 Rheinische Kalksteinwerke Verfahren zur Bestimmung der Leistungsaufnahme von Rohrmuehlen
DE1607580A1 (de) * 1967-04-26 1969-10-02 Rheinische Kalksteinwerke Verfahren zur Bestimmung des Schuettprofils und der sich daraus ergebenden Leistungsaufnahme einer Rohrmuehle
DE1939567A1 (de) * 1969-08-04 1971-02-11 Krupp Gmbh Vorrichtung zur Regelung der Mahlkoerperbewegung in Trommelmuehlen
DE2117556A1 (de) * 1971-04-10 1972-10-26 Fried. Krupp Gmbh, 4300 Essen Verfahren und Vorrichtung zum Regeln des Füllstandes von Kugelmühlen

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US4404640A (en) * 1981-01-09 1983-09-13 W. R. Grace & Co. Grinding mill monitoring instrumentation
US4635858A (en) * 1981-01-09 1987-01-13 W. R. Grace & Co. Methods of operating ball grinding mills
US4577804A (en) * 1984-08-07 1986-03-25 Freeport Minerals Company Wet grinding phosphate rock in an acidic slurry
US5224659A (en) * 1992-02-21 1993-07-06 Control International Apparatus for feeding grinding balls

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
DE1607581A1 (de) * 1967-04-26 1969-09-18 Rheinische Kalksteinwerke Verfahren zur Bestimmung der Leistungsaufnahme von Rohrmuehlen
DE1607580A1 (de) * 1967-04-26 1969-10-02 Rheinische Kalksteinwerke Verfahren zur Bestimmung des Schuettprofils und der sich daraus ergebenden Leistungsaufnahme einer Rohrmuehle
DE1939567A1 (de) * 1969-08-04 1971-02-11 Krupp Gmbh Vorrichtung zur Regelung der Mahlkoerperbewegung in Trommelmuehlen
DE2117556A1 (de) * 1971-04-10 1972-10-26 Fried. Krupp Gmbh, 4300 Essen Verfahren und Vorrichtung zum Regeln des Füllstandes von Kugelmühlen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105300473A (zh) * 2015-11-25 2016-02-03 太原理工大学 一种少量标定的基于深度信念网络的球磨机料位测量方法

Also Published As

Publication number Publication date
FR2734739A1 (fr) 1996-12-06
FR2734739B1 (fr) 1997-07-11
DE69608163D1 (de) 2000-06-15
ATE192670T1 (de) 2000-05-15
ES2147905T3 (es) 2000-10-01
CN1142988A (zh) 1997-02-19
CA2177932A1 (fr) 1996-12-02
EP0745427B1 (de) 2000-05-10
ZA957979B (en) 1996-04-18
DK0745427T3 (da) 2000-10-02
US5698797A (en) 1997-12-16
DE69608163T2 (de) 2000-12-21

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