WO2000062935A1 - Procede pour controler le niveau de remplissage en charbon d'un broyeur a boulet - Google Patents
Procede pour controler le niveau de remplissage en charbon d'un broyeur a boulet Download PDFInfo
- Publication number
- WO2000062935A1 WO2000062935A1 PCT/FR2000/000880 FR0000880W WO0062935A1 WO 2000062935 A1 WO2000062935 A1 WO 2000062935A1 FR 0000880 W FR0000880 W FR 0000880W WO 0062935 A1 WO0062935 A1 WO 0062935A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drum
- weight
- mill
- coal
- ground
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000003245 coal Substances 0.000 title description 29
- 238000005303 weighing Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000000227 grinding Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000004580 weight loss Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 230000011664 signaling Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 238000001033 granulometry Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
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 invention relates to a method for controlling the filling level of a ball mill supplied with grinding coal in which the mill comprises a drum mounted to rotate on two distant bearings.
- a crusher with a cylindrical, biconical or other casing drum, is more particularly used for supplying pulverized coal to burners of a pulverized coal boiler, for example.
- a first known method is based on the measurement of the variation of the power absorbed by the electric motor driving in rotation the drum of the crusher.
- a second known method is based on the measurement of the noise emitted by the mill during its operation.
- a third known method is based on the use of pneumatic probes introduced inside the mill drum.
- other known methods are based on the use of gamma ray probes placed inside the mill drum to detect the high level and the low level of the coal layer in the drum.
- the measures implemented in these known methods are dependent on the quality of the coal to be ground and in particular on its particle size and its degree of humidity. They are also dependent on the wear of the balls. It happens that they are not always reliable.
- the subject of the invention is therefore a method for controlling the filling level of a ball mill supplied with material to be ground, for example coal, in which the mill comprises a drum mounted to rotate on two remote bearings, characterized in that it consists in measuring the weight of the drum using strain gauge weighing sensors placed under the bearings supporting the drum and in comparing the measured weight with a pre-established reference value in order to regulate the supply of material to be ground to the mill.
- the weighing is a direct physical measurement of the level of filling in coal of the mill which is not influenced by the humidity and the granulometry of the grinding mass constituted by the mixture of coal and balls.
- the control method according to the invention is very reliable.
- the weight thus measured can easily be corrected by a computer program to take into account the vertical component of the rotational drive torque of the drum, the wear of the balls over time as well as the renewal of the balls in the grinder.
- the method according to the invention makes it possible to very precisely control the level of filling with coal of a ball mill.
- FIG. 1 is a diagram illustrating the principle of the method according to the invention.
- FIG. 2 is a flowchart illustrating the processing steps of a computer program implementing the method according to the invention.
- Figure 3 is a diagram showing the evolution over time of certain physical parameters related to the operation of the ball mill.
- Figure 4 is a very schematic front view of a ball mill equipped with weighing sensors for the implementation of the method according to the invention.
- FIG. 5 very schematically illustrates a weighing sensor used for the implementation of the method according to the invention.
- FIG. 6 very schematically shows the arrangement of the weighing sensors between two support flanges.
- FIG. 7 very schematically shows the arrangement of the sensors between the two support flanges in a triangle configuration.
- the measurement system 10 used in the method according to the invention to control the level of carbon filling of a ball mill comprises a set of load cells 11 to 16 with strain gauge. These sensors are arranged under the two bearings carrying the mill drum, which is rotatably mounted around a generally horizontal axis, to provide continuous electrical signals representative of a measurement of the weight of the drum with its load. Each load cell is compensated to measure only the vertical component of the pressure it experiences.
- Each set of load cells 11 to 13 and 14 to 16 are used.
- Each set of load cells is arranged under one of the two bearings on which the ends rest.
- the signals provided by the sensors 11 to 16 are sent to a calculation electronics 19 suitable for taring and for rendering a continuous electrical signal P, with the industrial standard 4-20 mA for example, representative only of the weight of the load (coal and balls) in the drum. It will be understood that the signal P results from a sum of the different signals supplied by the sensors 11 to 16.
- the signal P at the output of the electronics 19 is digitized to be compared with a basic setpoint 20 preset in a comparator 21 whose output is applied to a conventional regulator 22 for controlling the feeder 23 of raw coal 24 of the mill.
- the output of the comparator 21 serves to regulate the operating speed of the feeder and therefore the feed rate of the crusher in raw coal.
- the basic setpoint 20 corresponding to a certain level of filling with coal from the mill to obtain optimum grinding of the coal as a function of a certain mass of balls loaded into the mill.
- the mill drum is rotated by a gear system including a ring gear surrounding the drum casing coaxially with the axis of rotation of the mill drum and a drive pinion coupled to this ring, the vertical component of the torque d
- the drum drive acts on the weight measured by the weighing sensors 11 to 16.
- the measured weight P does not exactly represent the load in the mill drum.
- the measured weight P supplied by the calculation electronics 19 is corrected, before its comparison in the comparator 21, by a weight value corresponding to the vertical component of the rotation drive torque of the drum of the grinder rather than correcting the setpoint 20.
- the setpoint 20 is kept constant to simplify the monitoring of the grinding process by the operator.
- the weight loss of the load in the mill drum due to the wear of the balls must also be taken into account to precisely control the level of carbon filling in the mill because the density of coal is very low compared to that of cannonballs.
- the rate of wear of the balls ⁇ can be evaluated by experimentation and serve as a basis for correcting the measured weight P before its comparison with the reference value 20 in the comparator 21.
- FIG. 1 A weight loss of the load in the mill drum due to the wear of the balls must also be taken into account to precisely control the level of carbon filling in the mill because the density of coal is very low compared to that of cannonballs.
- the rate of wear of the balls ⁇ can be evaluated by experimentation and serve as a basis for correcting the measured weight P before its comparison with the reference value 20 in the comparator 21.
- the wear rate ⁇ expressed for example in kilograms / hour of operation of the mill is a pre-established constant which is multiplied by the overall time of operation of the mill (expressed in hours) delivered by an integrator 50 to provide a resulting weight value Pb which is subtracted, in the summator 30, at the measured weight P so as not to compensate in the regulation loop, the weight loss of the balls by a supply of carbon.
- the integrator 50 functions as a clock controlled by switching the grinder on and off.
- FIG. 1 there is illustrated by 51, a computer program which groups together the functionalities of module 30, module 31, comparator 21, regulator 22 and integrator 50. It also reacts in response to a manual control 52 making it possible to force the program to pass into a particular operating mode.
- the program 51 also controls the putting into operation or the extinction of a signaling indicator 53 which is linked to the particular operating mode of the program.
- FIG. 2 illustrates the operation of the computer program 51.
- the program begins by initializing the values 20, 33, 34 and the integrator 50.
- the particular operating mode of the program corresponds to a data calibration phase linked to taking into account the renewal of the balls.
- this calibration phase is triggered periodically, for example every 100 or 200 hours.
- the automatic triggering of this calibration phase is monitored by means of a specific counter called hereinafter the calibration counter.
- the program acquires an instantaneous value of the measured weight P supplied at the output of the electronics 19. As indicated above, this value corresponds to a sample of the continuous signal at standard 4-20mA supplied by the electronics 19.
- step 104 the program applies to the measured weight P the correction Pb linked to the wear of the balls and in step 105, the correction Fv linked to the effect of the drive torque.
- the corrected measured weight is processed by a regulation algorithm, of the proportional integral and derivative type (PID) and the regulation value is used in step 107 to control the feeder so as to regulate the coal flow at the inlet of the mill.
- PID proportional integral and derivative type
- a test 102 is provided to detect the actuation of the manual control 52 by the operator. If the actuation of this command is detected, the program goes to the next step 108. If not, it goes to the next step 103.
- step 108 the program controls the actuation of the signaling lamp 53.
- the signaling lamp can for example be an indicator lamp which serves to warn the operator that a calibration phase is being executed.
- step 109 in which the calibration counter is initialized.
- step 111 the program controls the slowing down of the feeder of the crusher to empty the stagnant coal reserve in the drum and in step 112 the time evolution of the amplitude of the power absorbed by the engine is recorded for the purpose of determining an amplitude peak.
- the curve P represents the time evolution of the amplitude, the power absorbed by the motor during the normal operation of the feeder and therefore of the crusher, then during the deceleration of the feeder and after resumption of normal operation of the feeder and therefore of the grinder.
- Curve A shows the variations in the speed of the feeder and curve O shows how the noise emitted by the crusher changes during these different feeder operating phases. It can be seen in FIG.
- step 113 the program determines the value Ppic corresponding to an extremum of the power absorbed by the motor during the calibration phase.
- step 114 the program determines the weight loss of balls from the previous calibration phase on the basis of the difference between the Ppic value obtained in step 113 and a Ppic value determined and recorded during the calibration phase previous.
- step 115 the program calibrates the wear rate as a function of the weight loss of the ball determined in step 14.
- step 116 it stores in a register the Ppic value determined in step 113 for comparison with a new Ppic value determined in a next step 113.
- step 117 the program accelerates the feeder so that it resumes normal operation and then in step 118, the program controls the extinction of the signaling 53.
- step 118 the program controls the extinction of the signaling 53.
- curve A of FIG. 3 we see how the speed of the feeder varies as a function of the sequence of steps 111 and 117 indicated above.
- the balls are renewed in the grinder without stopping the grinding. For example, they entered the crusher through the feeder.
- step 103 in which the program systematically tests the calibration counter to automatically start a calibration phase. If the calibration phase is detected, the program continues processing in step 108 as already described above. Consequently, the calibration phases are linked automatically even if the operator does not request them via manual control. These calibration phases triggered automatically will therefore take into account the normal wear and tear of the balls in the grinder to optimize the correction of weight loss of balls by normal wear.
- FIG. 4 very schematically shows a coal mill having here a cylindrical casing drum 200 rotatable around a horizontal axis A and which is terminated at its two ends by conical portions 201 and 202 bearing respectively on two bearings 203 and 204 spaced from one another along the axis A.
- This mill is used to prepare pulverulent coal ensuring the supply of the burners of a boiler.
- the feed element for ground coal is not shown in FIG. 4. It should be understood that the ground coal and a drying gas are introduced respectively by the annular part or pin 201 or 202 extending each conical end of the drum and the coal pulverized in the drying gas is evacuated by these journals against the current of raw coal.
- the drum 200 is loaded with metal balls or with other grinding elements made of hard material which pulverize by crushing or crushing the coal to be ground.
- the method according to the invention applies to a crusher having a drum with an envelope other than cylindrical, for example biconical, frustoconical, etc.
- the weighing sensors 11 to 13 and 14 to 16 are arranged under the bearings 203, 204 to undergo the entire weight of the drum of the crusher. More particularly in FIG. 6, the three sensors 11 to 13 are arranged between two parallel flanges 210, 211 which are themselves placed horizontally between the bearing 203 and a base 205 resting on the ground.
- the assembly is identical as regards the sensors 14 to 16 arranged between the bearing 202 and the base 206.
- FIG. 5 very schematically shows a weighing sensor such as 11. It is therefore a metal cylinder 300 with a central part which is slashed to create a beam working in shear under the effect of the pressure exerted on the Support bracket 301.
- the sensors used are of the compensated type to take into account that the vertical component of the pressure undergone by the bracket 301.
- FIG. 7 it can be seen that the sensors 11 to 13 are arranged in a plane on the sole 211 in a triangle configuration.
- the sensors 14 to 16 are arranged analogously in a triangle.
- the triangular arrangement of the three weighing sensors makes it possible to have a configuration symmetrical with respect to the axis of rotation A of the drum and a center of gravity combined on this axis.
- the weighing sensors used for implementing the process can for example be sensors sold by the company "Nobel Electronik".
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT00917148T ATE251497T1 (de) | 1999-04-15 | 2000-04-07 | Verfahren zur regelung des kohlefüllungsgrades einer kugelmühle |
CA002365299A CA2365299A1 (fr) | 1999-04-15 | 2000-04-07 | Procede pour controler le niveau de remplissage en charbon d'un broyeur a boulet |
EP00917148A EP1173280B1 (fr) | 1999-04-15 | 2000-04-07 | Procede pour controler le niveau de remplissage en charbon d'un broyeur a boulet |
PL00351555A PL195355B1 (pl) | 1999-04-15 | 2000-04-07 | Sposób kontrolowania poziomu wypełnienia młyna kulowego węglem i układ do kontrolowania poziomu wypełnienia węglem młyna kulowego |
JP2000612065A JP2002542018A (ja) | 1999-04-15 | 2000-04-07 | ボールミルの石炭充填レベルのモニタリング方法 |
DE60005811T DE60005811T2 (de) | 1999-04-15 | 2000-04-07 | Verfahren zur regelung des kohlefüllungsgrades einer kugelmühle |
AU38256/00A AU754114B2 (en) | 1999-04-15 | 2000-04-07 | Method for verifying the filling level of coal in a ball mill |
US09/958,484 US6619574B1 (en) | 1999-04-15 | 2000-04-07 | Method for verifying the filling level of coal in a ball mill |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR99/04737 | 1999-04-15 | ||
FR9904737A FR2792224B1 (fr) | 1999-04-15 | 1999-04-15 | Procede pour controler le niveau de remplissage en charbon d'un broyeur a boulets |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000062935A1 true WO2000062935A1 (fr) | 2000-10-26 |
Family
ID=9544447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2000/000880 WO2000062935A1 (fr) | 1999-04-15 | 2000-04-07 | Procede pour controler le niveau de remplissage en charbon d'un broyeur a boulet |
Country Status (14)
Country | Link |
---|---|
US (1) | US6619574B1 (fr) |
EP (1) | EP1173280B1 (fr) |
JP (1) | JP2002542018A (fr) |
CN (1) | CN1207101C (fr) |
AT (1) | ATE251497T1 (fr) |
AU (1) | AU754114B2 (fr) |
CA (1) | CA2365299A1 (fr) |
CZ (1) | CZ20013710A3 (fr) |
DE (1) | DE60005811T2 (fr) |
ES (1) | ES2208296T3 (fr) |
FR (1) | FR2792224B1 (fr) |
PL (1) | PL195355B1 (fr) |
WO (1) | WO2000062935A1 (fr) |
ZA (1) | ZA200107821B (fr) |
Families Citing this family (14)
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 |
DE102006038014B3 (de) | 2006-08-14 | 2008-04-30 | Siemens Ag | Verfahren zur Ermittlung eines Mühlenfüllstands |
US7850104B2 (en) * | 2007-03-21 | 2010-12-14 | Honeywell International Inc. | Inferential pulverized fuel flow sensing and manipulation within a coal mill |
CN102102512B (zh) * | 2009-12-22 | 2013-05-22 | 张永亮 | 综采工作面弯曲检测和矫直方法及其系统 |
CN103495487B (zh) * | 2013-10-17 | 2016-01-06 | 中冶长天国际工程有限责任公司 | 一种磨矿机控制中调节钢球填充率的方法和装置 |
CN104697575B (zh) * | 2013-12-09 | 2017-05-17 | 珠海市华远自动化科技有限公司 | 动态测定球磨机内物料量、钢球量及料球比的方法 |
CN104689888B (zh) * | 2013-12-09 | 2017-02-22 | 珠海市华远自动化科技有限公司 | 动态测定球磨机筒体内物料量、钢球量及料球比的方法 |
US20170225172A1 (en) * | 2014-08-07 | 2017-08-10 | Emerson Electric (Us) Holding Corporation (Chile) Limitada | Monitor and Control of Tumbling Mill Using Measurements of Vibration, Electrical Power Input and Mechanical Power |
EP3448575B1 (fr) * | 2016-04-28 | 2021-04-21 | Dal Elektrik Ve Otomasyon Sistemleri San. Tic. A.S. | Broyeur tubulaire et procédé associé pour déterminer le poids de matériau |
CN106902971A (zh) * | 2017-03-30 | 2017-06-30 | 太仓鸿策腾达网络科技有限公司 | 一种粉碎机控制系统 |
US10775090B2 (en) * | 2017-07-11 | 2020-09-15 | Bsh Hausgeraete Gmbh | Household cooling appliance comprising a weight detection unit for determining the weight of a container of an ice maker unit |
DE102017124958A1 (de) * | 2017-10-25 | 2019-04-25 | Kleemann Gmbh | Verfahren zum lastabhängigen Betrieb einer Materialzerkleinerungsanlage |
CN110947506A (zh) * | 2019-12-20 | 2020-04-03 | 华润电力技术研究院有限公司 | 一种磨煤机控制方法及设备 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3253744A (en) * | 1964-09-22 | 1966-05-31 | Nordberg Manufacturing Co | Electrical control system for grinding mill |
DE1218263B (de) * | 1963-10-10 | 1966-06-02 | Polysius Gmbh | Vorrichtung zur Regelung des Fuellungsgrades einer Rohrmuehle |
US3960330A (en) * | 1974-06-21 | 1976-06-01 | Henson Howard K | Method for maximizing throughput in an ore grinding system |
CA1162076A (fr) * | 1981-05-14 | 1984-02-14 | Marvin B. Shaver | Capteur indicateur de charge d'un broyeur |
US5325027A (en) * | 1991-01-15 | 1994-06-28 | Outokumpu Mintec Oy | Method and apparatus for measuring the degree of fullness of a mill with lifting beams by monitoring variation in power consumption |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3783252A (en) * | 1972-04-07 | 1974-01-01 | Westinghouse Electric Corp | Control system and method for a reversed ball mill grinding circuit |
-
1999
- 1999-04-15 FR FR9904737A patent/FR2792224B1/fr not_active Expired - Fee Related
-
2000
- 2000-04-07 JP JP2000612065A patent/JP2002542018A/ja not_active Withdrawn
- 2000-04-07 WO PCT/FR2000/000880 patent/WO2000062935A1/fr active IP Right Grant
- 2000-04-07 US US09/958,484 patent/US6619574B1/en not_active Expired - Lifetime
- 2000-04-07 CA CA002365299A patent/CA2365299A1/fr not_active Abandoned
- 2000-04-07 PL PL00351555A patent/PL195355B1/pl unknown
- 2000-04-07 ES ES00917148T patent/ES2208296T3/es not_active Expired - Lifetime
- 2000-04-07 CZ CZ20013710A patent/CZ20013710A3/cs unknown
- 2000-04-07 DE DE60005811T patent/DE60005811T2/de not_active Expired - Lifetime
- 2000-04-07 AT AT00917148T patent/ATE251497T1/de not_active IP Right Cessation
- 2000-04-07 CN CN00806235.8A patent/CN1207101C/zh not_active Expired - Fee Related
- 2000-04-07 EP EP00917148A patent/EP1173280B1/fr not_active Expired - Lifetime
- 2000-04-07 AU AU38256/00A patent/AU754114B2/en not_active Ceased
-
2001
- 2001-09-21 ZA ZA200107821A patent/ZA200107821B/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1218263B (de) * | 1963-10-10 | 1966-06-02 | Polysius Gmbh | Vorrichtung zur Regelung des Fuellungsgrades einer Rohrmuehle |
US3253744A (en) * | 1964-09-22 | 1966-05-31 | Nordberg Manufacturing Co | Electrical control system for grinding mill |
US3960330A (en) * | 1974-06-21 | 1976-06-01 | Henson Howard K | Method for maximizing throughput in an ore grinding system |
CA1162076A (fr) * | 1981-05-14 | 1984-02-14 | Marvin B. Shaver | Capteur indicateur de charge d'un broyeur |
US5325027A (en) * | 1991-01-15 | 1994-06-28 | Outokumpu Mintec Oy | Method and apparatus for measuring the degree of fullness of a mill with lifting beams by monitoring variation in power consumption |
Also Published As
Publication number | Publication date |
---|---|
ES2208296T3 (es) | 2004-06-16 |
FR2792224A1 (fr) | 2000-10-20 |
EP1173280B1 (fr) | 2003-10-08 |
DE60005811D1 (de) | 2003-11-13 |
ZA200107821B (en) | 2002-11-21 |
AU754114B2 (en) | 2002-11-07 |
CN1348398A (zh) | 2002-05-08 |
EP1173280A1 (fr) | 2002-01-23 |
PL351555A1 (en) | 2003-05-05 |
DE60005811T2 (de) | 2004-08-05 |
CZ20013710A3 (cs) | 2002-02-13 |
JP2002542018A (ja) | 2002-12-10 |
FR2792224B1 (fr) | 2001-06-01 |
US6619574B1 (en) | 2003-09-16 |
PL195355B1 (pl) | 2007-09-28 |
ATE251497T1 (de) | 2003-10-15 |
CA2365299A1 (fr) | 2000-10-26 |
AU3825600A (en) | 2000-11-02 |
CN1207101C (zh) | 2005-06-22 |
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