EP0745427B1 - Dispositif de surveillance d'un broyeur à boulets - Google Patents

Dispositif de surveillance d'un broyeur à boulets Download PDF

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Publication number
EP0745427B1
EP0745427B1 EP96401133A EP96401133A EP0745427B1 EP 0745427 B1 EP0745427 B1 EP 0745427B1 EP 96401133 A EP96401133 A EP 96401133A EP 96401133 A EP96401133 A EP 96401133A EP 0745427 B1 EP0745427 B1 EP 0745427B1
Authority
EP
European Patent Office
Prior art keywords
grinder
balls
coal
wear
jacket
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
EP96401133A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0745427A1 (fr
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
Alstom Energy Systems SA
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 Energy Systems SA filed Critical Alstom Energy Systems SA
Publication of EP0745427A1 publication Critical patent/EP0745427A1/fr
Application granted granted Critical
Publication of EP0745427B1 publication Critical patent/EP0745427B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 of a ball mill.
  • 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 (l b , l 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 (l c , l c ') spaced by an angle ⁇ , comprising a transmitter waves, chosen from electromagnetic waves, which can be placed inside the grinder and means for receiving such waves.
  • 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 recalibration frequent depending on the wear of the balls or the addition of new balls.
  • Pneumatic probes each comprising a pneumatic hose, one end of which is inserted at inside the grinder, allow measurements to be made the pressure difference between two levels; we can deduce the amount of coal in the grinder.
  • level sensors are installed in a hostile environment (coal dust, falls of balls, risk of blockage, etc.) making the risk significant breakdowns; the probes are connected to a cabinet complex, and therefore expensive, maintenance tire expensive. The availability of such a system is average.
  • Another system is based on noise measurement emitted by the crusher. This method has the disadvantage to provide a signal very dependent on the flow rate of the mill, the size of the pieces of coal introduced, the quantity of balls present in the grinder and the wear of armor plates fitted to the internal walls of the mill.
  • the object of the invention is to provide a device for monitoring of a ball mill, which allows the continuous control of these three parameters (quantity of coal, quantity of balls, wear of the envelope) using sensors outside the polluting atmosphere of inside the grinder and independent of the grinding medium.
  • the device according to the invention also allows a reliable direct measurement of these parameters.
  • the receivers of the compliant monitoring device to the invention are associated with electronic circuits for determining parameters corresponding to the quantity of balls, the amount of charcoal and wear of the shell and are disposed as defined by claim 1.
  • Figure 1 is a longitudinal sectional view of a coal grinding plant equipped with the surveillance 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 device monitoring according to the invention.
  • Figure 5 is a graph representing the signal of surveillance obtained using the device shown in the figure 4.
  • Figure 1 schematically shows a coal grinding plant comprising at least one feed device 10 supplying coal a ball mill generally designated by the reference 20.
  • the feed device 10 comprises a hopper of storage 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 pipe vertical 6.
  • the crusher 20 includes an envelope or ferrule cylindrical metallic 11 terminated by two portions conical 12 and 13 to which two are attached respectively pins 14 and 15 intended to support the ferrule.
  • the pins are placed respectively on two bearings 16 and 17 fitted with pads.
  • the crusher is rotated thanks to a toothed crown 18 cooperating with a pinion not represented driven by an electric gear motor not represented.
  • tubular portions 21 and 22 respectively provided with a screw of coaxial elastic Archimedes 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.
  • Coal arrives by gravity to through line 6, the second end of which opens out to the right of the tubular portion 22.
  • the coal arrives also on the other tubular portion 21 by a line 16 'of another supply device not represented.
  • Coal is entrained inside the mill by the rotation of Archimedes' screws 23 and 24.
  • the grinder is furnished with balls 27, for example of steel.
  • the balls crush the coal; fine particles of coal are entrained by hot air, in the annular spaces 28, 29 included respectively between the ferrules 14, 15 and the portions tubular 21, 22, and discharged to the burners by conduits 30 and 31.
  • the monitoring device includes a transmitter waves 33, chosen from electromagnetic waves, disposed inside the envelope 11. It is fixed and supported rotary for example in a socket carried by a arrangement of stays 36 welded inside the support tube of the Archimedes screw 23. Advantageously, it is arranged on the longitudinal axis of the envelope 11. Depending on the mode of preferred embodiment of the invention, it is a transmitter of gamma photons.
  • a receiver support assembly 34 arranged outside of envelope 11 and which will be specified more far.
  • 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 by an angle ⁇ .
  • the transmitter 33 scans a wave beam inside of the envelope 11.
  • the signals generated by the receivers 34A and 34B allow to know the absorption zone total due to the presence of the balls 27 or at least check that this zone is greater than the minimum zone eligible.
  • the signal generated by the 34C receiver allows to measure the wear of the casing 11 by determining the absorption variation as a function of the thickness of envelope 11.
  • the signal generated by the 34D receiver allows to measure the quantity of coal 32 by determination of the variation in absorption across this mass 32, taking into account the variation due to the thickness envelope 11 determined by the receiver 34C.
  • Figure 3 schematically shows an example of electronic circuit for measuring the three parameters.
  • the electronic circuit for determining the quantity of balls includes 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 carry out the calculation of the quantity of balls 27 transmitted on a reading device 44A.
  • the electronic circuit for determining the wear of the envelope includes a 40C converter associated with a device for reading the degree of wear 44C.
  • the electronic circuit for determining the quantity of coal has a 40D converter whose signal is corrected by differentiation by the wear signal 41D of the envelope 11 measured at the output of the converter 40C.
  • a second embodiment is shown in the figure 4.
  • a wave receiver 34 disposed outside the envelope 11 rotates at a speed ⁇ around the longitudinal axis of the envelope 11 on a angular sector ⁇ greater than the encompassing angular sector ⁇ and ⁇ , the receiver 34 being associated with a circuit wear determination electronics grinder, the quantity of balls and the quantity of coal.
  • 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 envelope 11, by determining the evolution of the curve.
  • the curve C2 represents a degree of wear compared to the initial curve C1.
  • the second area D2 allows you to control the amount of coal by monitoring the signal attenuation in 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 carbon filling.
  • the third area D3 allows you to control the quantity balls 27 by measuring its length on the abscissa.
  • curve C2 represents a decrease in this quantity of balls compared to the initial curve C1.
  • such a signal can be read and allows thus continuously monitoring the three parameters that are the wear of the casing, 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 Dispositif de surveillance d'un broyeur à boulets Expired - Lifetime EP0745427B1 (fr)

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 EP0745427A1 (fr) 1996-12-04
EP0745427B1 true EP0745427B1 (fr) 2000-05-10

Family

ID=9479582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96401133A Expired - Lifetime EP0745427B1 (fr) 1995-06-01 1996-05-24 Dispositif de surveillance d'un broyeur à boulets

Country Status (10)

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

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
US20080097723A1 (en) * 2006-09-11 2008-04-24 Universidad Tecnica Federico Santa Maria Intelligent monitoring system and method for mill drives in mineral grinding processes
EP2347828A1 (en) * 2010-01-21 2011-07-27 ABB Schweiz AG Method and apparatus for detaching frozen charge from a tube mill
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.
AU2011380685B2 (en) * 2011-11-10 2016-10-13 Ett Transferencia De Tecnologías Spa 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
CA2886987C (en) 2012-11-08 2022-07-12 Eleven Biotherapeutics, Inc. Il-6 antagonists and uses thereof
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
NZ731090A (en) 2014-11-07 2024-03-22 F Hoffmann La Roche Ltd Improved il-6 antibodies
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 (en) * 2015-05-28 2016-11-30 ABB Technology AG Method for determining a lifting angle and method for positioning a grinding mill
CN105300473B (zh) * 2015-11-25 2018-10-26 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
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
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

Family Cites Families (8)

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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
DE2117556A1 (de) * 1971-04-10 1972-10-26 Fried. Krupp Gmbh, 4300 Essen Verfahren und Vorrichtung zum Regeln des Füllstandes von Kugelmühlen
US4156992A (en) * 1977-11-07 1979-06-05 Pichette Joseph L Feed control adapter
US4635858A (en) * 1981-01-09 1987-01-13 W. R. Grace & Co. Methods of operating ball grinding mills
US4404640A (en) * 1981-01-09 1983-09-13 W. R. Grace & Co. Grinding mill monitoring instrumentation
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

Also Published As

Publication number Publication date
US5698797A (en) 1997-12-16
DE69608163T2 (de) 2000-12-21
ATE192670T1 (de) 2000-05-15
EP0745427A1 (fr) 1996-12-04
ZA957979B (en) 1996-04-18
DK0745427T3 (da) 2000-10-02
ES2147905T3 (es) 2000-10-01
FR2734739B1 (fr) 1997-07-11
DE69608163D1 (de) 2000-06-15
CN1142988A (zh) 1997-02-19
CA2177932A1 (fr) 1996-12-02
FR2734739A1 (fr) 1996-12-06

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