EP3265233B1 - Vertikal-rollenmühle - Google Patents

Vertikal-rollenmühle Download PDF

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Publication number
EP3265233B1
EP3265233B1 EP16706191.0A EP16706191A EP3265233B1 EP 3265233 B1 EP3265233 B1 EP 3265233B1 EP 16706191 A EP16706191 A EP 16706191A EP 3265233 B1 EP3265233 B1 EP 3265233B1
Authority
EP
European Patent Office
Prior art keywords
roll mill
bypass
vertical roll
nozzle ring
cross
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.)
Active
Application number
EP16706191.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3265233A1 (de
Inventor
Björn Olaf ASSMANN
Carsten Sachse
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.)
ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
Original Assignee
ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
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
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Publication of EP3265233A1 publication Critical patent/EP3265233A1/de
Application granted granted Critical
Publication of EP3265233B1 publication Critical patent/EP3265233B1/de
Active 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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface
    • 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
    • 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
    • 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
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
    • B03C1/18—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
    • B03C1/20—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation in the form of belts, e.g. cross-belt type
    • 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
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • the invention relates to a vertical roller mill with a bypass device for discharging difficult to grind particles, such as ductile particles, such as iron, from the grinding process.
  • An average slag sand or blast furnace slag contains an iron content between 0.3% to 0.5% by weight.
  • the iron can be discharged from the mill in two ways.
  • One variant is the discharge of the iron via the product stream.
  • the iron must be transported pneumatically to the classifier and then pass through the classifier rotor in order to mix with the ground product To leave mill.
  • the high density of the iron in relation to the blastfurnace slag and the small particle size of the product argue against discharging the iron with the product stream.
  • the pneumatic transport to the classifier is made more difficult and in the classifier, the iron on the rotor is preferably rejected because of its higher density, so that it is fed again as a meal to the plate. Due to the ductility of the iron particles hardly any comminution takes place, so that the fine iron circulates in the mill and accumulates.
  • the iron particles fall through the nozzle ring and are then removed from the material flow in the external material circuit by a magnetic separator.
  • the second Austragsdorfkeit on the nozzle ring is limited only to the coarse iron particles, because the finer iron particles are transported back to the plate due to the high speed in the nozzle ring.
  • the coarse iron particles fall through the nozzle ring and are transported by means of Austragsianan in the external circuit.
  • a reduction of the speed in the nozzle ring for the discharge of fine iron particles is not effective, since this u.a. negatively affects the load capacity of the mill.
  • a constructive enlargement of the nozzle ring surface degrades the operation, since the transmitted pulse for accelerating the product particles in the direction of the classifier is insufficient.
  • the grinding process is adversely affected.
  • the accumulated fine iron is therefore too coarse for the product and too fine for the cross flow classification at the nozzle ring.
  • the accumulation of fine iron has a negative effect on the wear of the grinding tools, the mill housing and the classifier.
  • the fine iron circulating in the mill causes an increase in energy demand, combined with a decrease in throughput.
  • the fine iron above a certain concentration in the grinding circuit leads to higher vibrations in mill operation.
  • the object of the invention is to provide a vertical roller mill, which significantly reduces iron accumulation on the grinding table.
  • the vertical roller mill has a grinding table, at least one grinding roller, a nozzle ring, an air supply device and at least one discharge element.
  • the nozzle ring surrounds the grinding table horizontally, which means that the nozzle ring is arranged annularly in the same plane around the grinding table.
  • the air supply device is arranged below the nozzle ring and below the air supply device, the at least one discharge element is arranged.
  • the vertical roller mill has at least one bypass device, wherein the at least one bypass device forms a connection between the nozzle ring and the at least one discharge element.
  • the at least one bypass device has no direct contact with the walls of the discharge element, since the discharge element rotates with the grinding plate and the bypass device can be statically fixed.
  • a flow-calming area is generated at the location of the bypass device in the nozzle ring.
  • virtually any material regardless of size and specific gravity, can be discharged through the at least one bypass device.
  • iron is discharged regardless of the particle size of the grinding table, an enrichment can be avoided.
  • the bypass device can be designed, for example, tubular with, for example, a round, oval, or angular cross-section. Particularly preferred is the round cross-section.
  • the at least one bypass device in the region of the air supply device has a gas-impermeable outer skin.
  • the gas-impermeable outer skin is a metal wall, a plastic wall or a Composite wall, in particular a glass fiber composite wall or a carbon fiber composite wall.
  • the outer skin for the comparatively strong gas flow in the air supply device is impermeable and thus generates no significant flow in the region of the nozzle ring. Questions of gas diffusion are therefore irrelevant in the context of this invention.
  • the number of bypass devices corresponds to the number of grinding rollers.
  • the number of bypass devices corresponds to an integer multiple of the number of grinding rollers.
  • the vertical roller mill has two to six milling rollers and two to six bypass devices.
  • the vertical roller mill has at least two bypass devices.
  • the at least two bypass devices are arranged equidistantly. Two bypass devices are found to be 180 ° apart on the nozzle ring, 120 ° for three bypass devices, and 90 ° for four bypass devices. If the vertical roller mill has an integer multiple of bypass devices compared to the number of grinding rollers, then groups of bypass devices corresponding to a number corresponding to the integer multiple may be arranged equidistant from each other.
  • the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is less than 2.5% of the surface of the grinding table.
  • the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is less than 1.0% of the surface of the grinding table.
  • the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is less than 0.5% of the surface of the grinding table.
  • the at least one bypass device affects the operation and thus the efficiency of the nozzle ring.
  • product is also carried by the at least one bypass device. Therefore, an excessively high bypass rate, which would result from an excessively large cross-sectional area of the at least one bypass device, does not make sense.
  • the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is at least 0.01% of the surface of the grinding table.
  • all the bypass devices together have a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of all the bypass devices together is less than 2.5% of the surface of the grinding table.
  • the sum of all cross-sectional areas of all bypass devices on the surface of the nozzle ring is less than 10% of the surface of the nozzle ring.
  • the sum of all cross-sectional areas of all bypass devices on the surface of the nozzle ring is less than 5% of the surface of the nozzle ring.
  • the bypass device has a largest cross section of less than 250 mm.
  • the largest cross-section is for example at a round cross-section of the diameter to understand in a rectangular cross-section the diagonal between opposite corners.
  • the largest cross-section thus represents the largest dimension that the cross section of a particle in the same plane can have, so that the particle can pass through the bypass device.
  • the bypass device has a largest cross section of less than 200 mm.
  • the bypass device has a largest cross section of less than 100 mm.
  • the bypass device has a largest cross section of at least 20 mm.
  • the bypass device has a largest cross section of at least 40 mm.
  • a separator is arranged behind the discharge element.
  • the separator is a magnetic separator, more preferably, the magnetic separator is selected from the group comprising Trommelmagnetabscheider and Matterbandmagnetabscheider.
  • a material return to the grinding table is arranged behind the separator.
  • the iron can be removed by the separator.
  • the other components regularly contain the educt or the product, so that they are advantageously fed back to the grinding table.
  • the bypass device has a larger cross-sectional area at the upper end on the nozzle ring than at the lower end on the discharge element.
  • the bypass device is designed conical. This has the advantage that due to the smaller diameter at the lower end less air can pass from the air supply device via the discharge element in the bypass device and thus the flow area above the bypass device can be calmed particularly efficient.
  • the bypass device is arranged within a below average flowed through area of the air supply device. This arrangement also results in less air being able to pass from the air supply device via the discharge element into the bypass device, and thus the flow region above the bypass device can be calmed particularly efficiently.
  • the bypass device is located in an area with sufficient material discharge from the grinding table. Sufficient is understood in this context, an area with locally above average material disposal.
  • the applicator element has a closure flap and the bypass device has a maximum distance of 950 mm from the lower edge of the dispensing element. Due to the comparatively small distance, less air can pass from the air supply device via the discharge element into the bypass device, and thus the flow region above the bypass device can be calmed particularly efficiently.
  • the applicator elements have a closure flap and the bypass device has a maximum distance of 750 mm from the lower edge of the dispensing element.
  • the applicator elements have a closure flap and the bypass device has a maximum distance of 550 mm from the lower edge of the dispensing element.
  • the vertical roller mill on an axis of symmetry, particularly preferably a threefold axis of rotation (C 3 after Schönflies), a selfish axis of rotation (C 4 after Schönflies) or a sechraw axis of rotation (C 6 after Schönflies) on.
  • FIG. 1 is shown a schematic cross section of the vertical roller mill 10 and in FIG. 2 a schematic plan view of the plane of the grinding table 20.
  • the grinding table 20 has recordable, a diameter of about 4.5 m, the nozzle ring 40 has a width of about 40 cm.
  • Above the grinding table 20 are in this exemplary vertical roller mill 10 three grinding rollers 30, of which only one in FIG. 1 you can see.
  • Below the nozzle ring 40 is the air supply device 50, in which three air inlets (in FIG. 2 air) which rises through the nozzle ring 40 and discharges the milled product from the vertical roller mill 10.
  • a discharge element 60 is arranged, in which the material falling through the nozzle ring 40 is collected.
  • the vertical roller mill 10 has an air outlet 105. This structure corresponds in this respect to a vertical roller mill according to the prior art.
  • the inventive vertical roller mill 10 additionally has, in the example shown, three bypass devices 70 which lead from the nozzle ring 40 into the discharge element 60. Since that Austragelement 60 is designed in the form of a depression below the air supply means 50, this area is flow-reduced, whereby only a small amount of air from the air inlet 55 through the air supply means 50, the discharge element 60 and the bypass devices 70 is passed. As a result, the flow above the bypass devices 70 is greatly reduced and so even small and thus comparatively light iron particles can be discharged through the bypass devices 70.
  • bypass devices 70 are oriented with a maximum fluidic distance from the three air inlets 55. This additionally reduces the air flowing through the bypass devices 70.
  • FIG. 3 a bypass device 70 is shown, wherein the bypass device 70 in the upper region with additional material baffles 75 which increase the material input into the bypass device 70 in the region of the nozzle ring 40.
  • FIG. 3a is to recognize the funnel function of the Materialleitblechs 75 in cross section, in FIG. 3b In the top view, the ratio between the diameter of the bypass device 70 and the Materialleitblechs well visible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP16706191.0A 2015-03-04 2016-02-25 Vertikal-rollenmühle Active EP3265233B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015203856.4A DE102015203856A1 (de) 2015-03-04 2015-03-04 Vertikal-Rollenmühle
PCT/EP2016/053905 WO2016139105A1 (de) 2015-03-04 2016-02-25 Vertikal-rollenmühle

Publications (2)

Publication Number Publication Date
EP3265233A1 EP3265233A1 (de) 2018-01-10
EP3265233B1 true EP3265233B1 (de) 2019-05-01

Family

ID=55411391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16706191.0A Active EP3265233B1 (de) 2015-03-04 2016-02-25 Vertikal-rollenmühle

Country Status (7)

Country Link
US (1) US10843200B2 (zh)
EP (1) EP3265233B1 (zh)
JP (1) JP6899776B2 (zh)
CN (1) CN107405626A (zh)
DE (1) DE102015203856A1 (zh)
DK (1) DK3265233T5 (zh)
WO (1) WO2016139105A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112169923B (zh) * 2020-09-10 2022-03-01 成都建筑材料工业设计研究院有限公司 一种钢渣立磨磨内除铁装置

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US3951347A (en) 1972-09-21 1976-04-20 Polysius Ag Apparatus for crushing material containing particles that are hard to pulverize
DE7234679U (de) * 1972-09-21 1973-08-02 Polysius Ag Waelzmuehle zum zerkleinern von mit schwer mahlbaren teilchen durchsetztem mahlgut
DE3344223A1 (de) * 1983-12-07 1985-06-20 Deutsche Babcock Werke AG, 4200 Oberhausen Schuesselmuehle
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JPH02137933A (ja) * 1988-11-18 1990-05-28 Ricoh Co Ltd 液体噴射記録装置
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JPH06210193A (ja) * 1993-01-20 1994-08-02 Sumitomo Metal Ind Ltd 高炉水砕スラグ微粉化における粒鉄の回収方法と装置
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DE102012100946B4 (de) 2012-02-06 2017-12-28 Thyssenkrupp Industrial Solutions Ag Rollenmühle und Verfahren zum Betreiben einer Rollenmühle
DE102012101489B4 (de) 2012-02-24 2016-04-28 Thyssenkrupp Industrial Solutions Ag Vertikalrollenmühle und Verfahren zum Betreiben einer Vertikalrollenmühle
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CN102847587A (zh) * 2012-08-22 2013-01-02 扬州中材机器制造有限公司 一种磨外循环矿渣立式辊磨机
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Also Published As

Publication number Publication date
WO2016139105A1 (de) 2016-09-09
US10843200B2 (en) 2020-11-24
US20180078942A1 (en) 2018-03-22
DE102015203856A1 (de) 2016-12-15
DK3265233T5 (da) 2019-08-19
EP3265233A1 (de) 2018-01-10
JP6899776B2 (ja) 2021-07-07
CN107405626A (zh) 2017-11-28
DK3265233T3 (da) 2019-08-05
JP2018507106A (ja) 2018-03-15

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