EP0244701A2 - Method of mill-crushing granular coke and its decay products - Google Patents
Method of mill-crushing granular coke and its decay products Download PDFInfo
- Publication number
- EP0244701A2 EP0244701A2 EP87105948A EP87105948A EP0244701A2 EP 0244701 A2 EP0244701 A2 EP 0244701A2 EP 87105948 A EP87105948 A EP 87105948A EP 87105948 A EP87105948 A EP 87105948A EP 0244701 A2 EP0244701 A2 EP 0244701A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding media
- grinding
- hollow bodies
- mills
- hollow
- 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.)
- Withdrawn
Links
- 239000000571 coke Substances 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims description 6
- 239000003077 lignite Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 241001474977 Palla Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000725 suspension 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
- 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
- B02C17/20—Disintegrating members
Definitions
- the invention relates to a method for comminuting granular cokes and their secondary products in mills, in particular in ball, tube or vibratory mills, under the influence of grinding media.
- mills with loose grinding media the ground material is comminuted by the impact and friction forces generated by the grinding media.
- the size of the shredding depends on the number, shape and weight of the grinding media.
- the invention is therefore based on the object, in a grinding process using grinding media, in particular in tube, ball or vibrating mills, in the comminution of granular cokes and their secondary products with different physical properties by an improved adaptation of the grinding media to the product properties To achieve grain size distribution.
- the present invention thus relates to a process for comminuting granular coke and its secondary products in mills, in particular ball, tube or vibrating mills, under the influence of grinding media, which is characterized in that the grinding media are hollow bodies.
- Pipes or pipe sections or hollow balls are preferably used as grinding media.
- the hollow bodies can be open (tubes) or closed (hollow spheres).
- a preferred embodiment of the method according to the invention is that the hollow bodies are poured out with a material which has a significantly lower density than the hollow body walls.
- a material can e.g. B. be plastic.
- the weight of the grinding media can be continuously adapted to the particular grinding problem in a wide range by adjusting the grinding media wall thickness.
- the grinding media according to the invention preferably have an outside diameter between 10 mm and 30 mm and wall thicknesses of 2 mm and 5 mm.
- grinding body densities in the range from 2.0 g / cm 3 to 6.5 g / cm 3 can be achieved without difficulty.
- the grinding media according to the invention can be used, in particular, for grinding coke and its secondary products.
- the filtering properties of the lignite coke used as a filter medium have also been significantly improved.
- a suspension produced with the lignite coke comminuted according to the invention was able to achieve a throughput which was more than 20% higher than with the lignite coke comminuted with rods.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Working-Up Tar And Pitch (AREA)
- Disintegrating Or Milling (AREA)
Abstract
Die vorliegende Erfindung betrifft ein Verfahren zum Zerkleinern körniger Kokse und deren Folgeprodukten in Mühlen, insbesondere Kugel-, Rohr- oder Schwingmühlen, unter dem Einfluß von Mahlkörpern, wobei die Mahlkörper Hohlkörper sind.The present invention relates to a method for comminuting granular coke and its secondary products in mills, in particular ball, tube or vibrating mills, under the influence of grinding media, the grinding media being hollow media.
Description
Die Erfindung betrifft ein Verfahren zum Zerkleinern von körnigen Koksen und deren Folgeprodukten in Mühlen, insbesondere in Kugel-, Rohr- oder Schwingmühlen, unter dem Einfluß von Mahlkörpern. In Mühlen mit losen Mahlkörpern wird das Mahlgut durch die von den Mahlkörpern erzeugten Schlag-und Reibungskräfte zerkleinert. Die Zerkleinerungs- intensität ist hierbei unter anderem von der Anzahl, der Form und dem Gewicht der Mahlkörper abhängig.The invention relates to a method for comminuting granular cokes and their secondary products in mills, in particular in ball, tube or vibratory mills, under the influence of grinding media. In mills with loose grinding media, the ground material is comminuted by the impact and friction forces generated by the grinding media. The size of the shredding depends on the number, shape and weight of the grinding media.
Bekannt sind Mahlkörper in Form von massiven Kugeln, Zylinderabschnitten, Stangen und verschiedenen Hohlkörpern aus den Deutschen Patentschriften Nr. 294 270, 322 872, 640 307, der DE-A 1 607 600.Grinding bodies in the form of solid balls, cylinder sections, rods and various hollow bodies are known from German Patent Specifications No. 294 270, 322 872, 640 307, DE-A 1 607 600.
In den genannten Patentschriften wird im wesentlichen darauf hingewiesen, daß durch Verringerung des Mahlkörpergewichtes die mechanische Belastung der Mühle und die Antriebsleistung herabgesetzt werden können. Es wird aber durch zu schwere Mahlkörper eine zu starke Kornvermahlung erwartet.In the cited patents it is essentially pointed out that by reducing the weight of the grinding media, the mechanical load on the mill and the drive power can be reduced. However, excessive grinding of the grain is expected due to the grinding media being too heavy.
Der Einsatz von Mühlen mit losen Mahlkörpern beschränkte sich bisher vorwiegend auf die Aufgabe, ein Mahlgut möglichst fein zu mahlen. In neuerer Zeit wird jedoch in zunehmendem Maße gefordert, Kokse und deren Folgeprodukte nicht nur fein, sondern auch mit einer engen Partikelgrößenverteilung herzustellen, da eine enge Partikelgrößenverteilung eine Reihe von Vorteilen für die weitere Verarbeitung des Produktes mit sich bringt (z.B. verbesserte Rieselfähigkeit, Vermeiden von Staub etc.). Häufig besteht auch das Problem, den Anteil von qualitätsminderndem Feinstaub « 5 µm) zu vermindern. Dies ist z.B. bei Koksen und deren Folgeprodukten, die als Filtermittel eingesetzt werden von ausschlaggebender Bedeutung. Es hat sich gezeigt, daß diese Forderungen nur dann erfüllt werden können, wenn bei vorgegebener Mahlkörpergeometrie das Gewicht der Mahlkörper besser an die Eigenschaften des Mahlgutes angepaßt werden kann. Der Erfindung liegt also die Aufgabe zugrunde, bei einem Mahlprozeß unter Verwendung von Mahlkörpern, insbesondere in Rohr-, Kugel- oder Schwingmühlen, bei der Zerkleinerung von körnigen Koksen und deren Folgeprodukten mit unterschiedlichen physikalischen Eigenschaften durch eine verbesserte Anpassung der Mahlkörper an die Produkteigenschaften eine engere Korngrößenverteilung zu erzielen.The use of mills with loose grinding media has so far been mainly limited to the task of grinding a grinding material as finely as possible. In recent times, however, there has been an increasing demand not only to produce coke and its secondary products finely, but also with a narrow particle size distribution, since a narrow particle size distribution brings with it a number of advantages for further processing of the product (e.g. improved flowability, avoidance of Dust etc.). There is also often the problem of reducing the proportion of quality-reducing fine dust (5 µm). This is e.g. in the case of coke and its secondary products, which are used as filter media, of crucial importance. It has been shown that these requirements can only be met if the weight of the grinding media can be better adapted to the properties of the grinding stock for a given grinding media geometry. The invention is therefore based on the object, in a grinding process using grinding media, in particular in tube, ball or vibrating mills, in the comminution of granular cokes and their secondary products with different physical properties by an improved adaptation of the grinding media to the product properties To achieve grain size distribution.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß als Mahlkörper Hohlkörper verwendet werden.This object is achieved in that hollow bodies are used as grinding media.
Gegenstand der vorliegenden Erfindung ist somit ein Verfahren zum Zerkleinern körniger Kokse und deren Folgeprodukten in Mühlen, insbesondere Kugel-, Rohr- oder Schwingmühlen, unter dem Einfluß von Mahlkörpern, welches dadurch gekennzeichnet ist, daß die Mahlkörper Hohlkörper sind.The present invention thus relates to a process for comminuting granular coke and its secondary products in mills, in particular ball, tube or vibrating mills, under the influence of grinding media, which is characterized in that the grinding media are hollow bodies.
Vorzugsweise werden Rohre oder Rohrabschnitte oder Hohlkugeln als Mahlkörper verwendet. Die Hohlkörper können dabei offen (Rohre) oder geschlossen (Hohlkugeln) sein.Pipes or pipe sections or hollow balls are preferably used as grinding media. The hollow bodies can be open (tubes) or closed (hollow spheres).
Eine bevorzugte Ausführungsform des erfindungsgemäßen Verfahrens besteht darin, daß die Hohlkörper mit einem Material ausgegossen sind, welches eine wesentlich geringere Dichte besitzt als die Hohlkörperwandungen. Ein solches Material kann z. B. Kunststoff sein. Auf diese Weise kann trotz der begrenzten Zahl von geeigneten beständigen Mahlkörperwerkstoffen das Gewicht der Mahlkörper durch Anpassung der Mahlkörperwandstärke in weiten Bereichen kontinuierlich an das jeweilige Mahlproblem angepaßt werden.A preferred embodiment of the method according to the invention is that the hollow bodies are poured out with a material which has a significantly lower density than the hollow body walls. Such a material can e.g. B. be plastic. In this way, despite the limited number of suitable, resistant grinding media materials, the weight of the grinding media can be continuously adapted to the particular grinding problem in a wide range by adjusting the grinding media wall thickness.
Die erfindungsgemäßen Mahlkörper haben vorzugsweise einen Außendurchmesser zwischen 10 mm und 30 mm und Wandstärken von 2 mm und 5 mm. Für aus Stahl (Dichte ca. 7,85 g/cm3) gefertigte Hohlkörper lassen sich ohne Schwierigkeiten Mahlkörperdichten im Bereich von 2,0 g/cm3 bis 6,5 g/cm3 realisieren.The grinding media according to the invention preferably have an outside diameter between 10 mm and 30 mm and wall thicknesses of 2 mm and 5 mm. For hollow bodies made of steel (density approx. 7.85 g / cm 3 ), grinding body densities in the range from 2.0 g / cm 3 to 6.5 g / cm 3 can be achieved without difficulty.
Es hat sich gezeigt, daß die erfindungsgemäßen Mahlkörper, insbesondere für die Mahlung von Koksen und deren Folgeprodukten eingesetzt werden können.It has been shown that the grinding media according to the invention can be used, in particular, for grinding coke and its secondary products.
Im folgenden wird die Erfindung beispielhaft erläutert, ohne daß darin eine Einschränkung zu sehen ist.In the following, the invention is explained by way of example, without any limitation being seen therein.
Ein Aktivat, hergestellt durch Wasserstoffaktivierung von Braunkohlenschwelkoks in einem Wirbelschichtreaktor, wurde in einer Schwingmühle (Palla U20 der Fa. KHD) mit einer Länge von 600 mm und einem Durchmesser von 200 mm bei einer Schwingamplitude von 12,5 mm und einem Mahlkörperfüllgrad von 65 % gemahlen.An activate, produced by hydrogen activation of lignite hot coke in a fluidized bed reactor, was in a vibrating mill (Palla U20 from KHD) with a length of 600 mm and a diameter of 200 mm with an oscillation amplitude of 12.5 mm and a grinding media filling degree of 65% ground.
Durch Verwendung von Stahlrohren mit einer Wandstärke von 2 mm und einem Außendurchmesser von 15 mm als Mahlkörper anstelle von massiven Stahlstangen gleicher äußerer Geometrie konnte der Feinstaubanteil (Partikelgröße < 5 µm) um mehr als 30 % reduziert werden.By using steel pipes with a wall thickness of 2 mm and an outer diameter of 15 mm as grinding media instead of solid steel rods with the same outer geometry, the proportion of fine dust (particle size <5 µm) could be reduced by more than 30%.
Auch wurde die Filtriereigenschaft des als Filtermittel benutzten Braunkohlekokses erheblich verbessert. So konnte bei einem Filter bei sonst gleichen Filtrationsbedingungen mit einer mit dem erfindungsgemäß zerkleinerten Braunkohlekoks hergestellten Suspension ein um mehr als 20 % höherer Durchsatz erzielt werden, als mit dem mit Stangen zerkleinerten Braunkohlekoks.The filtering properties of the lignite coke used as a filter medium have also been significantly improved. Thus, with a filter under otherwise identical filtration conditions, a suspension produced with the lignite coke comminuted according to the invention was able to achieve a throughput which was more than 20% higher than with the lignite coke comminuted with rods.
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863615104 DE3615104A1 (en) | 1986-05-03 | 1986-05-03 | METHOD FOR CRUSHING GRAINY COCKS AND THEIR FOLLOWING PRODUCTS IN MILLS |
| DE3615104 | 1986-05-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0244701A2 true EP0244701A2 (en) | 1987-11-11 |
| EP0244701A3 EP0244701A3 (en) | 1988-08-10 |
Family
ID=6300162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87105948A Withdrawn EP0244701A3 (en) | 1986-05-03 | 1987-04-23 | Method of mill-crushing granular coke and its decay products |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0244701A3 (en) |
| DE (1) | DE3615104A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191224448A (en) * | 1912-10-25 | 1913-06-26 | William Fennell | Improvements in or in connection with Tube Mills. |
| DE322872C (en) * | 1912-11-06 | 1920-07-10 | William Fennell | Grinding bodies, the diameter of which is smaller than their length, for the exercise of comminution in tubular mills |
| DE483891C (en) * | 1926-03-14 | 1929-10-08 | Maschb Akt Ges | Ball for centrifugal ball mills |
| CH129281A (en) * | 1927-11-17 | 1928-12-01 | Keller & Co | Grinding media for tube and compound mills. |
| GB284580A (en) * | 1927-12-12 | 1928-02-02 | Otto Kordt | Improvements in hollow grinding bodies for ball-, drum- and tubular mills |
| CH177325A (en) * | 1934-08-31 | 1935-05-31 | Kordt & Rosch Aktiengesellscha | Spherical grinding media for all types of mills. |
| DE640307C (en) * | 1935-04-27 | 1937-07-05 | Otto Kordt | Hollow grinders |
| DE1607600A1 (en) * | 1967-12-23 | 1969-10-02 | Siteg Siebtech Gmbh | Method and device for processing by means of flotation |
-
1986
- 1986-05-03 DE DE19863615104 patent/DE3615104A1/en not_active Withdrawn
-
1987
- 1987-04-23 EP EP87105948A patent/EP0244701A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0244701A3 (en) | 1988-08-10 |
| DE3615104A1 (en) | 1987-11-05 |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| 17P | Request for examination filed |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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| 18W | Application withdrawn |
Withdrawal date: 19890225 |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: THOM, KARL-FRIEDRICH, DR. Inventor name: KELLER WOLFGANG, DIPL.-ING. Inventor name: SCHMIDT, PETER, DR. Inventor name: GIERSIEPEN, GERHARD, DIPL.-ING. Inventor name: METZGER, KARL-LUDWIG, DR. Inventor name: SIEBERT, HORST, DIPL.-ING. |