EP2651563A1 - Walzenmühle und verfahren zum betreiben einer walzenmühle - Google Patents
Walzenmühle und verfahren zum betreiben einer walzenmühleInfo
- Publication number
- EP2651563A1 EP2651563A1 EP12703104.5A EP12703104A EP2651563A1 EP 2651563 A1 EP2651563 A1 EP 2651563A1 EP 12703104 A EP12703104 A EP 12703104A EP 2651563 A1 EP2651563 A1 EP 2651563A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- grinding
- gas pressure
- regulating device
- ground
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 32
- 230000003068 static effect Effects 0.000 claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000001419 dependent effect Effects 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid Substances 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
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/42—Driving mechanisms; Roller speed control
-
- 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 roller mill and a method for operating a roller mill with two grinding rollers for comminuting material to be ground, wherein at least one grinding roller is driven and the grinding rollers between them form a grinding gap for comminuting the material to be ground and a feed shaft through which the material is fed to the grinding gap ,
- the throughput of such roll mills depends only on the peripheral speed of the grinding rolls for a given mill and millbase.
- the maximum possible peripheral speed is limited by the properties of the material in the feeder.
- a roller mill is known from US Pat. No. 4,640,464 A, in which grinding rolls roll on a grinding ring and the ground material is comminuted between the grinding roll and the grinding ring. About an air flow, the crushed millbase is carried in a arranged above the grinding rollers classifier. A control and monitoring device monitors the feed rate of the ground material as a function of the amount of discharged comminuted material, whereby the correct ratio of air to solid is ensured. The air flow is detected in particular via pressure sensors.
- the invention is therefore based on the object to further develop the roll mill and the method for operating the roll mill to the effect that on the one hand the highest possible throughput is ensured and on the other hand, the formation of air bubbles is largely avoided with the disadvantages described above.
- the roller mill according to the invention essentially consists of two grinding rollers driven in opposite directions, which form between them a grinding gap for comminuting material to be ground and a task shaft, via which the material to be ground is fed to the grinding gap. Furthermore, a pressure sensor for measuring the static gas pressure is arranged in the feed chute, which is in communication with a control or regulating device which changes the peripheral speed of the grinding rollers in dependence on the measured static gas pressure.
- the pressure in flowing media is composed of a static and a dynamic component, the static pressure being measured according to the invention.
- the static gas pressure in the feed chute is measured and used to control or
- the flowing air creates a pressure drop on its way from the compression zone to the free surface.
- the amount of pressure depends on the porosity of the material and the distance to the free surface.
- the height of the pressure in the inflowing material is thus a measure of the porosity of the material and thus of the intake and venting conditions.
- the maximum throughput of a roller mill is thus determined by the porosity and thus the flow resistance of the material.
- the porosity of the material in the catchment area changes continuously in the case of real millbases, on the one hand by different particle size distributions of the feed material and on the other hand by changing millabilities. Changes in the porosity and thus the flow resistance simultaneously cause a change in the static pressure in the inflowing material.
- the speed and thus the peripheral speed of the grinding rollers adapted, the static gas pressure is used as a control and / or controlled variable, which is kept constant by adjusting the Mahlwalzenwidiere.
- the disturbing influences from changes in the porosity can be specifically regulated and the roll mill can thus always be operated at the throughput maximum.
- At least one grinding roller can / can be assigned a drive device which is connected to the control or regulating device communicates and preferably has a controlled via a frequency converter motor.
- the adjustment of the grinding roll speed can be done in particular via a frequency converter with field-oriented speed control.
- the control or regulating device is preferably formed by a model-based control or regulating device, wherein in particular a model-based predictive control or regulating device can be used.
- a target gas pressure dependent on the material to be ground and the fineness to be achieved is compared with the measured static gas pressure, the refining speed being reduced if the measured static gas pressure is greater than the target gas pressure and the refining speed is increased if the measured static gas pressure is less than the target air pressure.
- the roller mill can be operated, for example, with a nominal gas pressure in the order of magnitude of 5-200 mbar, preferably from 20-200 mbar, overpressure.
- the drawing shows a schematic representation of a roll mill according to the invention.
- the roller mill according to the invention has two grinding rollers 1, 2 for comminuting material to be ground 3, which is fed via a feed chute 7 to a grinding gap 6 formed between the grinding rollers.
- the two grinding rollers 1, 2 are driven in opposite directions via associated drive means 4, 5 and cooperate with a Kraftbeetzyerungssystem together to adjust the grinding force can.
- a pressure sensor 8 for measuring the static gas pressure is arranged in the feed chute 7, which communicates with a control or regulating device 9 in connection is, which changes the peripheral speed of the grinding rollers 1, 2 in dependence of the measured air pressure.
- the two drive means 4, 5 are formed for example as asynchronous motors, which are controlled by associated frequency converter 10, 11. The adjustment of the peripheral speed of the grinding rollers 1, 2 via the frequency converter 10, 11 can be done with field-oriented speed control.
- the control or regulating device 9 is preferably formed by a model-based control or regulating device, wherein in particular a model-based predictive control or regulating device can be used.
- a prediction of the state of development as a function of system parameters 12, and / or state or measurement data 13 and / or external specifications 14 is calculated and evaluated with the help of a dynamic model of the process to be controlled, with the help of the frequency converter 10, 11 are controlled.
- the system parameters 12 are, for example, fixed variables, such as the power of the drive devices or the grinding roller diameter. In particular, throughput values or the grinding roller speed enter as state or measurement data 13.
- the external specifications 14 are formed, for example, by the material to be comminuted, the desired fineness or the grinding force generated by the grinding rollers 1, 2.
- the model is used to determine a gas pressure set point in the feed chute which is compared to the static gas pressure measured via the pressure sensor 8, reducing the mill roll speed if the measured static gas pressure is greater than the setpoint and increases the refining roll speed when the measured static gas pressure is less than the setpoint.
- a setpoint for the gas pressure in the order of 5 - 200 mbar, preferably from 20 - 200 mbar, overpressure has proven to be particularly suitable, on the one hand to achieve the highest possible throughput and on the other hand, the formation of air bubbles in Discharge shaft and concomitant segregation of the material to be ground and fluctuating throughputs with consequent vibration to avoid.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201110000748 DE102011000748A1 (de) | 2011-02-15 | 2011-02-15 | Walzenmühle und Verfahren zum Betreiben einer Walzenmühle |
| PCT/EP2012/052052 WO2012110363A1 (de) | 2011-02-15 | 2012-02-07 | Walzenmühle und verfahren zum betreiben einer walzenmühle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2651563A1 true EP2651563A1 (de) | 2013-10-23 |
| EP2651563B1 EP2651563B1 (de) | 2014-04-09 |
Family
ID=45569657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12703104.5A Not-in-force EP2651563B1 (de) | 2011-02-15 | 2012-02-07 | Walzenmühle und verfahren zum betreiben einer walzenmühle |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9050603B2 (de) |
| EP (1) | EP2651563B1 (de) |
| DE (1) | DE102011000748A1 (de) |
| DK (1) | DK2651563T3 (de) |
| WO (1) | WO2012110363A1 (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2540396A1 (de) * | 2011-06-30 | 2013-01-02 | Bühler AG | Verfahren und Vorrichtung für die Herstellung von Mehl und/oder Griess |
| EP3019723A4 (de) | 2013-07-09 | 2017-05-10 | United Technologies Corporation | Beschichteter polymerverdichter |
| JP7314172B2 (ja) | 2018-01-16 | 2023-07-25 | スレイガー ベンジャミン | セルロース材料を糖に変換するためのシステム及びその使用方法 |
| CN112808443A (zh) * | 2021-01-04 | 2021-05-18 | 中冶长天国际工程有限责任公司 | 一种破碎机及其破碎辊磨损检测装置与检测方法 |
| CN115194579B (zh) * | 2022-09-15 | 2022-12-09 | 中铝材料应用研究院有限公司 | 磨光式表面处理设备及操作方法 |
| SE2430371A1 (en) * | 2024-07-12 | 2025-09-30 | Klingmill Ab | A system and method for controlling a particle size of a pulverized base material |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4478371A (en) | 1982-01-07 | 1984-10-23 | Williams Patent Crusher And Pulverizer Company | Fuel grinding apparatus |
| JPS609509A (ja) * | 1983-06-29 | 1985-01-18 | Hitachi Ltd | 圧延機の制御方法 |
| US4640464A (en) * | 1984-11-07 | 1987-02-03 | Combustion Engineering, Inc. | Roller mill control system |
| DE3525936A1 (de) * | 1985-07-19 | 1987-01-29 | Krupp Polysius Ag | Verfahren und anlage zur entwaesserung und zerkleinerung von mahlgut hoher feuchte |
| EP0514953B1 (de) | 1987-04-28 | 1996-10-16 | Nittetsu Mining Co., Ltd. | Walzenbrecher und Brechverfahren mit Anwendung desselben |
| DK176500B1 (da) * | 1992-07-28 | 2008-06-02 | Kobe Steel Ltd | Fremgangsmåde til styring af en valsemölle |
| JP2798596B2 (ja) | 1993-02-15 | 1998-09-17 | 株式会社神戸製鋼所 | ローラミル |
-
2011
- 2011-02-15 DE DE201110000748 patent/DE102011000748A1/de not_active Withdrawn
-
2012
- 2012-02-07 DK DK12703104.5T patent/DK2651563T3/da active
- 2012-02-07 EP EP12703104.5A patent/EP2651563B1/de not_active Not-in-force
- 2012-02-07 US US13/985,438 patent/US9050603B2/en not_active Expired - Fee Related
- 2012-02-07 WO PCT/EP2012/052052 patent/WO2012110363A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012110363A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2651563B1 (de) | 2014-04-09 |
| WO2012110363A1 (de) | 2012-08-23 |
| DE102011000748A1 (de) | 2012-08-16 |
| US20130320120A1 (en) | 2013-12-05 |
| DK2651563T3 (da) | 2014-07-07 |
| US9050603B2 (en) | 2015-06-09 |
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