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EP2888052A2 - Procédé de broyage - Google Patents

Procédé de broyage

Info

Publication number
EP2888052A2
EP2888052A2 EP13752626.5A EP13752626A EP2888052A2 EP 2888052 A2 EP2888052 A2 EP 2888052A2 EP 13752626 A EP13752626 A EP 13752626A EP 2888052 A2 EP2888052 A2 EP 2888052A2
Authority
EP
European Patent Office
Prior art keywords
grinding
roller
bed
grinding bed
determined
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
EP13752626.5A
Other languages
German (de)
English (en)
Other versions
EP2888052B1 (fr
Inventor
Ralf Haase
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.)
GBF Gesellschaft fur Bemessungsforschung MbH
Original Assignee
GBF Gesellschaft fur Bemessungsforschung MbH
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 GBF Gesellschaft fur Bemessungsforschung MbH filed Critical GBF Gesellschaft fur Bemessungsforschung MbH
Publication of EP2888052A2 publication Critical patent/EP2888052A2/fr
Application granted granted Critical
Publication of EP2888052B1 publication Critical patent/EP2888052B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/007—Mills with rollers pressed against a rotary horizontal 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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/02—Centrifugal pendulum-type 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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers

Definitions

  • the invention relates to a method for grinding a millbase in a mill with a grinding body, and having at least one roller which rolls on the grinding body under a grinding pressure, wherein the millbase brought in a Mahlgutstrom as a grinding bed between the grinding media and the roll and in the grinding bed of the role is crushed, while grinding a Mahlbett sleep the Mahlbetts between the grinding media and the roller is measured continuously, and the mill is controlled by manipulated variables to a predetermined desired state, wherein the manipulated variables include at least the grinding pressure and the Mahlgutstrom and the desired state at least one target value for the Mahlbettiere flows includes.
  • a vertical mill controllable in such a method discloses, for example, DE 1 507 579 B.
  • Such vertical mills are used, in particular, in the cement industry and in coal power plants for grinding brittle grinding stock, for example raw meal (as a starting material for cement production), cement clinker, limestone in general, coal, clay, Gypsum or granulated slag (slag).
  • a vertical mill consists essentially of one or more mills with a rotating grinding table as a common grinding body and a respective roll rolling on this grinding body.
  • the rollers may be geometric balls or cylindrical, tapered or crowned rollers.
  • Surfaces of the grinding body and the rollers can be provided with highly wear-resistant pads, for example made of chilled cast iron.
  • the mechanical condition of the grinding bed during rolling over - its strength and its Mahlbethehehe on the grinding media - determines significantly the effectiveness of the grinding process.
  • the known method monitors the Mahlbett too and fineness and amount of the discharged particles and automatically adjusts to their manipulated variables in deviation from a defined state of the vertical mill for the measured parameters.
  • Mahlgutmassenstrom (the so-called “mill load”), grinding pressure, Mahlbett Love, Mahlgut-grinding properties (eg Hardgroveiere) and storage volume and ⁇ -emission or the flame pattern of a mill downstream burner and the pressure difference between the mill inlet and outlet of the flowing through the mill hot drying air including the entrained fine dried pulverized coal particles and the evaporated water from the coal proposed.
  • the invention has for its object to propose a different method for adjusting the variables.
  • a mechanical state of the roll and therefrom a strength of the grinding bed are determined continuously, and the desired state comprises at least one setpoint for the strength of the grinding bed.
  • the known methods are limited to the measurement of the Mahlbettiere, because in addition the effectiveness of the grinding process substantially determining strength of the grinding bed is not directly measurable.
  • the invention is based on the finding that the strength of the grinding bed under a roller correlates with the mechanical state via the equations of motion and can be calculated from this equation.
  • the mechanical condition of the roller - state of motion, forces acting and deformations occurring - can be measured by well-known methods.
  • the inventive method provides for the regulation of the grinding process with the complete mechanical state of the grinding bed a controlled variable available, which is in a much more direct relationship with the manipulated variables of the vertical mill.
  • the automatic adaptation of the manipulated variables is thus only possible.
  • the mechanical condition of the roll comprises a force acting on the roll from the grinding bed and a location and / or angle of rotation of the roll about a rotation axis of the roll.
  • the force and optionally the location is determined at least in the radial direction of the roller.
  • About the Radial components of the force and location of the roll can be the stiffness of the grinding bed perpendicular to the grinding media, determine the tangential component of the force and the angle of rotation in the direction of movement of the grinding bed.
  • the strength of the grinding bed comprises at least one damping of the grinding bed and / or a stiffness of the grinding bed.
  • Movement components and the force in the three spatial directions and around the three spatial axes are all possibly linearly independent components for determining the strength detected.
  • Components of these parameters of the mechanical condition of the role to be less relevant.
  • the determination of the less relevant components can correspondingly be dispensed with.
  • the proportionality constants are particularly preferably determined continuously during grinding. Since the proportionality constants should not change in the regular operation of a mill, or only very slowly, their continuous monitoring provides a good insight into the state of wear, in particular of the roll. A sudden change in the proportionality constants can indicate a malfunction in operation and serve as a criterion for an automatic emergency shutdown.
  • water can be brought between the grinding body and the roller with the ground material, wherein the manipulated variables comprise a quantity of the applied water.
  • the ground material can be conveyed by substantially vertically flowing air in a classifier and there classified according to criteria at least from particles large, density, inertia and floating or stratification behavior, the
  • Control variables include a quantity of the flowing air and a classifier speed of the classifier.
  • Fig. 2 shows a detail of the vertical mill
  • Fig. 3 is a schematic diagram of the equations of motion.
  • the vertical mill 1 shown in FIG. 1 has four mills 2 with a grinding plate as a common grinding element 3.
  • the four mills 2 and the grinding media 3 are anchored on a common foundation 4.
  • Grinding body 3 is firmly connected to the foundation 4.
  • the grinding body 3 is rotatably mounted about a vertical axis 6 and is driven during operation of the vertical mill 1.
  • FIG. 2 shows in detail a single mill 2 of the vertical mill 1.
  • Each mill 2 has a roller 7 which rotates about a horizontal axis 8 and rolls on the grinding body 3.
  • the constants k and c of the equation of motion correspond to the rigidity and the damping of the grinding bed 9. All variables are vector quantities.
  • Velocity v and the acceleration a in the (idealized) contact point with the grinding bed 9 parts in the tangential direction of the derivatives of the angle ⁇ are included.
  • a raw material for cement production is ground, which consists of about 90 per cent of limestone.
  • Other aggregates are especially marl, coal dust and aluminum, the latter being added even in fine-grained form in the vertical mill.
  • the ground material is heated to about 200 ° C prior to application in order to avoid premature caking.
  • measuring transducers are first to be continuous
  • the proportionality constants are determined by multidimensional nonlinear regression, which describe the relationship between the strength of the grinding bed 9 and the manipulated variables of the mills 2.
  • Target state a corresponding adjustment of the control variables is determined with the now known mathematical relationship and set in a control room of the vertical mill 1 as the setpoint, which restores the desired state.
  • roller mill also: “roller press”
  • the role on a second is also suitable, is the good-bed roller mill (also: “roller press"), in which the role on a second, the same or the same
  • the ground material is essentially fed from above into the gusset between the two rollers, crushed and falls down into the grinding bowl.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

L'invention concerne un procédé de broyage d'une matière à broyer dans un broyeur (2) comprenant un élément broyeur (3), et au moins un rouleau (7) qui roule sur l'élément broyeur (3) en exerçant une pression de broyage ; la matière à broyer étant amenée dans un flux de matière à broyer en tant que lit à broyer (9) entre l'élément broyeur (3) et le rouleau (7), et étant broyée dans le lit à broyer (9) par le rouleau (7), la hauteur du lit à broyer (9) étant mesurée entre l'élément broyeur (3) et le rouleau (7) lors du broyage, et le broyeur (2) étant réglé à l'aide de grandeurs de réglage à un état théorique prédéfini ; les grandeurs de réglage comportant au moins la pression de broyage et le flux de matière à broyer, et l'état théorique comportant au moins une valeur de consigne pour la hauteur du lit à broyer. Selon l'invention, sont déterminés en continu lors du broyage un état mécanique du rouleau (7) et, à partir de là, est déterminée une résistance du lit à broyer (9), et l'état théorique comprend au moins une valeur de consigne de la résistance du lit à broyer (9).
EP13752626.5A 2012-08-22 2013-08-21 Procédé de broyage Not-in-force EP2888052B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012107740.1A DE102012107740A1 (de) 2012-08-22 2012-08-22 Verfahren zum Mahlen
PCT/EP2013/067393 WO2014029809A2 (fr) 2012-08-22 2013-08-21 Procédé de broyage

Publications (2)

Publication Number Publication Date
EP2888052A2 true EP2888052A2 (fr) 2015-07-01
EP2888052B1 EP2888052B1 (fr) 2016-10-19

Family

ID=49029094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13752626.5A Not-in-force EP2888052B1 (fr) 2012-08-22 2013-08-21 Procédé de broyage

Country Status (6)

Country Link
US (1) US9981270B2 (fr)
EP (1) EP2888052B1 (fr)
JP (1) JP6261585B2 (fr)
DE (1) DE102012107740A1 (fr)
DK (1) DK2888052T3 (fr)
WO (1) WO2014029809A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6728977B2 (ja) * 2016-05-26 2020-07-22 宇部興産機械株式会社 竪型粉砕機
JP6713430B2 (ja) * 2017-03-30 2020-06-24 Ｊｘ金属株式会社 竪型粉砕装置の操業方法
JP7080970B2 (ja) * 2018-05-18 2022-06-06 三菱重工業株式会社 粉砕装置及び粉砕装置の制御方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372496A (en) * 1980-10-01 1983-02-08 Combustion Engineering, Inc. Electronic controller of hydraulic pressure for journal loading of bowl mill
JP2003340299A (ja) * 2002-05-24 2003-12-02 Ishikawajima Harima Heavy Ind Co Ltd ミルの石炭粉砕性判定方法及び出炭特性制御方法
DK176989B1 (da) * 2007-06-27 2010-10-04 Smidth As F L Rulningsleje
DE102007062820A1 (de) * 2007-12-21 2009-08-06 Evonik Energy Services Gmbh Mühlenregelungssystem und Verfahren zum Betreiben einer Mühle
TW201043336A (en) * 2009-04-01 2010-12-16 Smidth As F L Method for controlling the material feed to a roller mill and such mill
DE102009031429B4 (de) * 2009-07-01 2015-05-28 Rwe Power Ag Verfahren und Vorrichtung zum Mahlen von körnigem Material
DE102012100946B4 (de) * 2012-02-06 2017-12-28 Thyssenkrupp Industrial Solutions Ag Rollenmühle und Verfahren zum Betreiben einer Rollenmühle
US9457353B2 (en) * 2013-01-31 2016-10-04 Orlando Utilities Commission Coal pulverizer monitoring system and associated methods

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014029809A3 *

Also Published As

Publication number Publication date
EP2888052B1 (fr) 2016-10-19
US9981270B2 (en) 2018-05-29
US20150238973A1 (en) 2015-08-27
WO2014029809A3 (fr) 2014-05-15
JP2015530922A (ja) 2015-10-29
DE102012107740A1 (de) 2014-02-27
DK2888052T3 (en) 2017-01-16
WO2014029809A2 (fr) 2014-02-27
CN104582854A (zh) 2015-04-29
JP6261585B2 (ja) 2018-01-17

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