EP2368638A1 - Procédé et dispositif destinés au broyage à froid - Google Patents

Procédé et dispositif destinés au broyage à froid Download PDF

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Publication number
EP2368638A1
EP2368638A1 EP11159022A EP11159022A EP2368638A1 EP 2368638 A1 EP2368638 A1 EP 2368638A1 EP 11159022 A EP11159022 A EP 11159022A EP 11159022 A EP11159022 A EP 11159022A EP 2368638 A1 EP2368638 A1 EP 2368638A1
Authority
EP
European Patent Office
Prior art keywords
grinder
refrigerant
cryogenic refrigerant
temperature
grinding
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
EP11159022A
Other languages
German (de)
English (en)
Other versions
EP2368638B1 (fr
Inventor
Oliver Dietrich
Thomas Böckler
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.)
Messer Group GmbH
Original Assignee
Messer Group GmbH
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 Messer Group GmbH filed Critical Messer Group GmbH
Priority to RS20190281A priority Critical patent/RS58531B1/sr
Priority to PL11159022T priority patent/PL2368638T3/pl
Publication of EP2368638A1 publication Critical patent/EP2368638A1/fr
Application granted granted Critical
Publication of EP2368638B1 publication Critical patent/EP2368638B1/fr
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
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
    • B02C19/186—Use of cold or heat for 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
    • 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
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
    • B02C2201/04—Codes relating to disintegrating devices adapted for specific materials for used tyres

Definitions

  • the invention relates to a method for cold milling, in which a feed material is ground in a grinder and cooled before or during the milling process with a liquid cryogenic refrigerant.
  • the invention further relates to a corresponding device.
  • Particularly difficult to grind products are materials with rubber-elastic, viscoelastic or plastic properties and / or materials that have a high agglomeration readiness of the ground particles for various reasons, such as engineering plastics, waxes, pharmaceuticals or certain natural products. Since the properties mentioned hinder reliable comminution, these materials are embrittled during the so-called cold grinding before the grinding process, for example in a vortex screw cooler by means of a cryogenic refrigerant and then metered fed to the mill. The problem with this is that during the grinding process heat is introduced to a considerable extent in the cold millbase. This makes the more noticeable the smaller the particle size. Namely, the smaller the particles are, the higher the mass-specific energy expenditure required for the grinding.
  • cooling of the feedstock by means of a cryogenic refrigerant present in the liquid state is much more advantageous.
  • the liquid nitrogen is used as the refrigerant is, for example, from DE 10 2007 051 548 A1 known.
  • the heat transfer is in this case so good that within the particles ofoptionguts a large temperature difference between the rapidly cooled outer surface and the still-warm core occurs, which in turn favors the comminution of the particles.
  • this method is particularly suitable to realize even when grinding plastic, viscoelastic and rubber-elastic materials easily particle sizes of less than 10 microns, especially 1 to 3 microns, with the addition of additives (substances that re-agglomeration of the ground Avoiding ponds following the grinding process) can be dispensed with.
  • additives substances that re-agglomeration of the ground Avoiding ponds following the grinding process
  • cryogenic liquefied refrigerant is passed with boiling temperature through the appropriate supply lines. A portion of the refrigerant will therefore evaporate due to the unavoidable heat input through the walls of the leads already in the feed to the grinder and thus affect the cooling effect.
  • the object of the present invention is therefore to provide a method and a device for cold grinding of grinding stock with the aid of a liquefied cryogenic refrigerant, which enables reliable control of the cooling and is also economical and efficient in use.
  • the liquid cryogenic refrigerant (the terms “liquid” and “liquefied” cryogenic refrigerant are used below) is subcooled during its supply to the grinder, ie brought to a temperature below its boiling point
  • the reduced evolution of gas within the supply line leads to a uniform flow of refrigerant into the grinder, which can be well regulated Cryogenic refrigerants are also still in the supercooled state within the grinder, as a result of which the feed material is in contact with the liquefied cryogenic refrigerant for a longer period of time
  • Refrigerant has a temperature well below the boiling temperature at the respective pressure conditions in the supply line.
  • the supercooling takes place, for example, by thermal contact with a refrigerant corresponding to lower temperature.
  • a mill with grinding media is used, in which the millbase is placed with the grinding media in a grinding container and grated against each other and against the container wall under the movement of the grinding media.
  • mills are ball, rod, vibratory, agitator, Rhackskskugel- or planetary mills.
  • impact mills such as hammer, pin, universal and air jet mills, as well as friction mills, such as rotor and long-gap mills, and granulators are used.
  • the direct contact of the feed with the liquefied cryogenic refrigerant allows a very good heat transfer from the feed to the refrigerant.
  • the at least predominantly registered in the solid or liquid state refrigerant vaporizes upon thermal contact with the feed material or the grinding media and is then removed or used to cool a grinding unit downstream classification unit, such as a filter or a classifier to re-agglomeration in the Classification to stop.
  • a grinding unit downstream classification unit such as a filter or a classifier to re-agglomeration in the Classification to stop.
  • An advantageous development of the invention provides that the flow rate and / or the temperature of the cryogenic refrigerant to be supplied to the grinder as a function of one or more measured in the grinder parameter (s), in particular the temperature of the grind, is regulated , Even with a low flow rate, the heat input via the walls of the supply line can be easily compensated and / or ensured in this way by a correspondingly higher subcooling, that the refrigerant is introduced in the still supercooled state in the grinder and / or one of the grinder upstream cooling device.
  • the temperature difference, by which the refrigerant, which was previously at its boiling point, is cooled, is calculated according to the requirement that cryogenic refrigerants, when supplied to the grinder or pre-cooler preceded by the grinder, are at least substantially in the liquid state and / or still in the supercooled state is entered in the grinder or the pre-cooler. Therefore, the temperature difference to the boiling point after the supercooling is preferably at least 2K, preferably at least 5K, particularly preferably at least 10K.
  • the preferred cryogenic refrigerant used is liquid nitrogen.
  • the supercooling is carried out, for example, by thermal contact with a cryogenic refrigerant having a lower boiling point, for example, with a bath of liquid nitrogen, in which a low temperature is achieved by lowering the pressure.
  • a nitrogen bath is provided in which a pressure of 1000 mbar, which sets a temperature of 77 K in the nitrogen bath; a pressure reduction of the nitrogen bath to 100 to 200 mbar even leads to a cooling to 60 K to 66 K.
  • the brought into thermal contact with this nitrogen bath liquid nitrogen in the supply line can be easily cooled to a temperature of for example 78 K to 80 K.
  • the object of the invention is also achieved by a device for finely grinding ground material, which is equipped with a grinder, a task unit for supplying the feed to the grinder and a supply line for a liquefied cryogenic refrigerant, and which is characterized in that the supply line means for subcooling the liquefied cryogenic refrigerant flowing through the supply line.
  • the means for supercooling prevents the occurrence of boiling gas bubbles in the supply line due to the unavoidable heat input even with well-insulated pipes and thus stabilizes the inflow of the liquefied cryogenic refrigerant to the grinder.
  • the supply line preferably leads into the grinding device and / or into a cooling device connected upstream of the grinding device;
  • the liquefied cryogenic refrigerant thus serves both for pre-cooling of the feedstock and for cooling during the milling process.
  • the only drawing ( Fig. 1 ) shows a schematic view of a device according to the invention for cold grinding.
  • the device 1 illustrated in the drawing comprises a grinder 2 and a cooling unit 3 arranged upstream of the grinder 2.
  • the grinder 2 is, for example, an impact mill, in which the feed material inside a grinding container 2 is comminuted by means of rotating pin disks.
  • the cooling unit 3 comprises, for example, a vortex worm cooler, in the input via a feed hopper 4 feed material is brought into direct contact with a liquefied cryogenic refrigerant.
  • the device 1 comprises a tank 5 for a cryogenic liquefied cryogenic refrigerant.
  • a cryogenic liquefied cryogenic refrigerant As "liquefied cold-liquefied” here is understood a gas whose liquid state is maintained by that its storage temperature is maintained by technical measures such as cooling and / or insulation.
  • the tank 5 is fluidly connected via a thermally insulated supply line 6 to the cooling unit 3; another, also thermally insulated supply line 8 at a branch 7 from the supply line 6 establishes a flow connection between the tank 5 and the grinder 2 forth.
  • the presence of both leads 6,8 is by no means required within the scope of the invention; he can also be a supply of the cryogenic liquefied refrigerant either in the cooling unit 3 or in the grinder 2 done.
  • the supply of liquefied cryogenic refrigerant from the tank 5 to the cooling unit 3 or the grinding device 2 can be controlled by operating quantity control valves 9, 10.
  • a gas-tight metering unit 12 is arranged.
  • Another gas-tight material lock 13 is located at the outlet of the grinder 2.
  • evaporated cryogenic refrigerant is removed via a gas discharge line 14.
  • a device 15 for subcooling the liquefied cryogenic refrigerant is arranged.
  • the device 15 is, for example, a chiller or a heat exchanger.
  • the device 15 comprises a bath of the same refrigerant as that stored in the tank 5, but whose temperature has been lowered by lowering the pressure and is thus able to cool the refrigerant passed through the supply line 6 to a temperature below its boiling point.
  • a computer unit 16 is connected to sensors, not shown here, for example, the temperature in the grinder 2 inside the grinder 2 and with the flow control valves 9, 10, the metering unit 12, the material lock 13 and the device 15 in data communication.
  • the feed material is fed via the feed hopper 4 of the cooling unit 3 and brought there in direct contact with the supplied via feed line 6 liquefied cryogenic refrigerant.
  • Refrigerant in the cooling unit 3 is at least partially still in the liquefied state, there is a particularly good heat transfer from the feed to the refrigerant.
  • the refrigerant evaporated in the cooling process is removed via the gas discharge line 14.
  • the pre-cooled feed then passes into the grinder 2 and is ground there.
  • Refrigerant can also be supplied via the supply line 7 in order to dissipate the process heat arising during the grinding and to keep the millbase at a low temperature during the grinding.
  • the ground material is then removed via the material lock 13 from the device 1 and, for example, filled into a transport container, not shown here.
  • the control of the inflow of refrigerant is carried out by means of the computer unit 16.
  • one or more parameters in the grinder are detected continuously or at predetermined intervals, for example, the temperature in the grinder 2 or the grain size of the milled Guts. From this, according to a predetermined program, a value for the influx of refrigerant through the supply lines 6 and / or 7 is calculated and the mass flow valves 9, 10 are controlled accordingly. For example, if the temperature in the grinder 2 drops below a predetermined value, the flow control valves 9, 10 are throttled or completely closed.
  • the refrigerant is subcooled by means of the device 15, ie to one Temperature is at least 2 to 10 K below its boiling point.
  • the refrigerant reaches the cooling unit 3 or the grinder 2 at least substantially in the liquid state.
  • the refrigerant may initially be in the supercooled state, with the result that the refrigerant is in the cooling process for a longer period of time in the liquid state and thus a very efficient cooling of the ground material to, for example, 120 to 100 K or less effected.
  • the regrind even with chemically active substances or substances with plastic or elastic properties, can be reliably ground to particle sizes below 500 microns.
  • the subcooling by means of the computer unit 16 is controlled and the temperature of the refrigerant in the supply line 6,7 in a wide range, for example, be varied to values between 80 K and 92 K. In this way, the grinder 2 or the cooling unit 3 is not supplied with superfluous gas even with different flow rates of supplied refrigerant.
  • the power consumption of the device 1 is lowered overall and the Mahlgut micsatz antique is increased.
  • the temperature of the liquid nitrogen in the supply line is lowered to a value of, for example, about 85 K.
  • the liquid nitrogen additionally reaches the cooling unit 3 or at a temperature of approximately 87 K, ie significantly below its boiling point of the grinder 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Disintegrating Or Milling (AREA)
EP11159022.0A 2010-03-24 2011-03-21 Procédé et dispositif destinés au broyage à froid Active EP2368638B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
RS20190281A RS58531B1 (sr) 2010-03-24 2011-03-21 Postupak i uređaj za hladno mlevenje
PL11159022T PL2368638T3 (pl) 2010-03-24 2011-03-21 Sposób i urządzenie do mielenia na zimno

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010012448A DE102010012448A1 (de) 2010-03-24 2010-03-24 Verfahren und Vorrichtung zum Kaltmahlen

Publications (2)

Publication Number Publication Date
EP2368638A1 true EP2368638A1 (fr) 2011-09-28
EP2368638B1 EP2368638B1 (fr) 2018-12-05

Family

ID=44209544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11159022.0A Active EP2368638B1 (fr) 2010-03-24 2011-03-21 Procédé et dispositif destinés au broyage à froid

Country Status (6)

Country Link
EP (1) EP2368638B1 (fr)
DE (1) DE102010012448A1 (fr)
ES (1) ES2714687T3 (fr)
HU (1) HUE042560T2 (fr)
PL (1) PL2368638T3 (fr)
RS (1) RS58531B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103913027A (zh) * 2014-04-11 2014-07-09 莱阳市贵合机械有限公司 超微粉碎机液氮冷却装置
CN107029840A (zh) * 2017-03-16 2017-08-11 广州合成材料研究院有限公司 一种实验室冷冻粉碎的方法
EP3594554A1 (fr) 2018-07-11 2020-01-15 Messer Group GmbH Dispositif de sous-refroidissement des gaz liquéfiés

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019007404A1 (de) * 2019-10-24 2021-04-29 Hosokawa Alpine Aktiengesellschaft Verfahren zur kryogenen Zerkleinerung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897010A (en) * 1971-07-02 1975-07-29 Linde Ag Method of and apparatus for the milling of granular materials
DE2516764A1 (de) 1975-04-16 1976-10-28 Linde Ag Kaltmahlverfahren
DE102007051548A1 (de) 2007-10-29 2009-06-18 Siemens Ag Verfahren zur Messung der Herzperfusion in einem Patienten und CT-System zur Durchführung dieses Verfahrens

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1534274A (en) * 1975-01-21 1978-11-29 Boc International Ltd Size reduction
DE19717621A1 (de) * 1997-04-25 1998-06-25 Linde Ag Unterkühlen von flüssigen Gasen
DE102007051545A1 (de) * 2007-10-29 2009-04-30 Messer Group Gmbh Verfahren und Vorrichtung zur Feinstmahlung von Feststoffen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897010A (en) * 1971-07-02 1975-07-29 Linde Ag Method of and apparatus for the milling of granular materials
DE2516764A1 (de) 1975-04-16 1976-10-28 Linde Ag Kaltmahlverfahren
DE102007051548A1 (de) 2007-10-29 2009-06-18 Siemens Ag Verfahren zur Messung der Herzperfusion in einem Patienten und CT-System zur Durchführung dieses Verfahrens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103913027A (zh) * 2014-04-11 2014-07-09 莱阳市贵合机械有限公司 超微粉碎机液氮冷却装置
CN107029840A (zh) * 2017-03-16 2017-08-11 广州合成材料研究院有限公司 一种实验室冷冻粉碎的方法
EP3594554A1 (fr) 2018-07-11 2020-01-15 Messer Group GmbH Dispositif de sous-refroidissement des gaz liquéfiés
DE102018005503A1 (de) 2018-07-11 2020-01-16 Messer Group Gmbh Vorrichtung zum Unterkühlen von verflüssigten Gasen

Also Published As

Publication number Publication date
PL2368638T3 (pl) 2019-06-28
HUE042560T2 (hu) 2019-07-29
EP2368638B1 (fr) 2018-12-05
DE102010012448A1 (de) 2011-09-29
RS58531B1 (sr) 2019-04-30
ES2714687T3 (es) 2019-05-29

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