EP2879798A2 - Vertikalrollenmühle - Google Patents
VertikalrollenmühleInfo
- Publication number
- EP2879798A2 EP2879798A2 EP13736839.5A EP13736839A EP2879798A2 EP 2879798 A2 EP2879798 A2 EP 2879798A2 EP 13736839 A EP13736839 A EP 13736839A EP 2879798 A2 EP2879798 A2 EP 2879798A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller mill
- nozzle ring
- vertical roller
- radius
- gas inlets
- 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
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
- B02C15/04—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
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
- B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
Definitions
- the invention relates to a VertikalroUenmühle with at least one grinding roller and a grinding table and arranged around the grinding plate nozzle ring.
- a VertikalroUenmühle is known for example from DE 38 39 419 AI, in which the material to be crushed is fed via a chute or a shaft to the grinding table and then crushed under the action of the grinding rollers.
- the shredded material is discharged through the edge of the grinding table and from there pneumatically fed to a sifter above the mill.
- the required air flow is supplied via a arranged around the grinding plate nozzle ring.
- an annular space arranged below the nozzle ring is provided which is supplied with air via at least one gas inlet.
- a plurality of circumferentially distributed and tangentially connected gas inlets are also provided according to a first embodiment.
- a second embodiment is provided in which the air of the single gas inlet is divided by a part is introduced directly into the annulus, while the other part is guided around the annulus and fed on the opposite side.
- a loss of velocity of the gas stream due to the longer path can be compensated by a continuously tapering cross section.
- the invention is therefore based on the object to provide a new concept for a homogenization of the supplied volume flow in the annulus below the nozzle ring.
- the vertical roller mill according to the invention has at least one, preferably a plurality of grinding rollers and a grinding plate and a nozzle ring arranged around the grinding plate, which is in communication with an annular space arranged underneath, wherein the annular space has at least two gas inlets distributed over its circumference, which are tangential in the same direction of rotation open, and the annular space is limited to the outside between the gas inlets in each case by a spiral wall.
- the inflowing gas streams can be optimally balanced by the generated circular swirl flow, although the space conditions in the annular space are usually only very limited.
- each spiral wall tapers from a first radius to a second, smaller radius. It has also been found to be advantageous if there is a vertical distance of at least the width of the nozzle ring between the nozzle ring and an upper edge of the gas inlets. This will be sufficient Deflection space created for the usually horizontally entering the annulus gas flows to the upward flow through the nozzle ring.
- a collar for deflecting the gas streams introduced via the gas inlets is provided between the upper edge of the gas inlets and the nozzle ring.
- This collar may, for example, widen conically from the upper edge of the gas inlets to the nozzle ring.
- the diameter of the collar in the region of the nozzle ring substantially corresponds to the minimum outer diameter of the nozzle ring in order to ensure an optimal connection to the nozzle ring.
- the radius of the collar can expediently not be greater than the smaller second radius of the spiral wall in the region of the upper edge of the gas inlets.
- the nozzle ring may be formed both circular and non-circular, the collar preferably has a circular shape and is drawn inwardly at least to the extent that the helical walls between the gas inlets are covered.
- the minimum angle of the collar relative to the horizontal can be specified in particular with 0 to 45 °, preferably in the range 25 to 35 °.
- the spiral walls extend over the height of the gas inlets and the annular space between the upper edges of the gas inlets and the nozzle ring is limited by a cylindrical wall.
- the nozzle ring is circular, wherein the first radius of the spiral walls corresponds to the outer radius of the nozzle ring.
- the radius of the cylindrical wall corresponds to the first radius of the spiral walls and the spiral walls are covered with a ring plate whose outer radius corresponds to the radius of the cylindrical wall and whose inner radius is less than or equal to the second radius of the spiral walls.
- the ratio of the amount of cylindrical wall to the width of the ring plate preferably at least 0.4.
- the collar is oriented at an angle relative to the horizontal, which is smaller than the angle of repose of the ground through falling through the nozzle ring, especially in the case of the ring plate, a conical collar of bulk material will form, which also serves the function of targeted and uniform deflection allows the air masses.
- the collar may be provided in segments with recesses, thereby the in
- FIG. 3 is a schematic sectional view of the annular space according to a first embodiment
- FIG. 4 is a schematic sectional view of the annular space according to a second embodiment
- FIG. 7a - 7c different views of an annular space with three gas inlets
- FIG. 8a - 8c different views of an annular space with four gas inlets.
- the vertical roller mill according to FIG. 1 has a plurality of grinding rollers 1 which cooperate with a grinding table 2 for comminuting ground material.
- a separator 4 arranged above the grinding plate is further provided.
- Grist 5 passes through a feed chute 6 in a known manner on the grinding table 2 and from there under the grinding rollers 1.
- the comminuted material passes through the centrifugal force of the rotating grinding table 2 on the Mahltellerrand 2a and is there from a about one to the grinding table 2 arranged nozzle ring 7 supplied sight gas stream 8 detected and transported upwards in the separator 4.
- the sifter 4 is designed, for example, as a rod sifter and returns the coarse material back to the grinding table, while the fine material is removed together with the sifting gas stream 8 via an outlet 4a.
- the nozzle ring 7 communicates with an annular space 9 arranged underneath, which has at least two gas inlets 10, 11 distributed over its circumference.
- the annular space 9 serves to equalize the supplied via the gas inlets the sight gas.
- the sight gas 8 of the nozzle ring is provided in a known manner with a plurality of nozzle ring blades.
- the actual invention relates to the design of the annular space 9 with the connected gas inlets and will be explained in more detail below.
- FIGS. 2a to 2c show a first exemplary embodiment of the annular space 9 in the variant with two gas inlets 10, 11.
- Fig. 3 this example is shown in a schematic sectional view.
- Both gas inlets 10, 11 open in the same direction of rotation tangentially into the annular space 9 and are arranged offset by 180 °.
- the annular space 9 is bounded inwardly by the grinding table 2 or its substructure and outwardly between the two gas inlets 10, 11 by spiral walls 14, 15.
- Each spiral wall 14, 15 tapers from a first radius R1 to a second smaller radius R2.
- the vertical height of the spiral walls 14, 15 corresponds to the vertical height of the gas inlets 10, 11th
- a vertical distance a is provided between the nozzle ring 7 and the upper edges of the gas inlets 10, 11, a vertical distance a is provided.
- the upper edge of the gas inlet 10 is provided with the reference numeral 10a.
- This vertical distance a is preferably at least as large as the width b of the nozzle ring 7.
- the nozzle ring 7 is circular. However, other forms, such as an angularly rounded shape, are conceivable within the scope of the invention.
- the minimum outer diameter of the nozzle ring corresponds to twice the first radius Rl of the spiral walls 10, 11.
- the annular space is between the upper edges of the gas inlets 10, 11 and the nozzle ring either by a conically widening towards the nozzle ring collar 20 (see Fig. 3) or by a cylindrical wall 21 (see Fig. 4) limited.
- the collar is preferably circular in shape and pulled inwards at least so far that the spiral walls 14, 15 are covered from above.
- the inner boundary of the collar 20 is shown in dashed lines in Fig. 2a.
- the collar supports the deflection of the visual gas 8, wherein the angle ⁇ relative to the horizontal should preferably be in the range of 25 to 35 °.
- a horizontal annular plate 22 is provided at the level of the upper edge of the gas inlets 10, 11, whose Outer diameter corresponds to the diameter of the cylindrical wall 21 and whose inner diameter is less than or equal to twice the second radius R2 of the spiral walls.
- the annular plate 22 covers the resulting by the inwardly tapering spiral walls 14 and 15 resulting gaps 18, 19 (see Fig. 2a).
- this is correspondingly covered on its underside so that the classifying gas does not unintentionally enter below the collar (see FIG. 3).
- This conical pile then assumes the function of the conical collar 20 of FIG. 3.
- the ratio of the height of the cylindrical wall 21 and the width of the ring plate 22 is at least 0.4, so that a suitable pour cone 23 can form.
- the collar 20 is therefore provided with recesses 20a.
- the number of recesses corresponds expediently, the single or multiple multiples of the number of grinding rollers. 1
- the collar 20 with its four recesses 20a would therefore be suitable in particular for a vertical roller mill with four grinding rollers 1.
- the recesses 20a must be matched to the arrangement of the grinding rollers 1 in order to produce the desired flow of the classifying gas 8.
- the embodiment according to FIGS. 6a and 6b shows a polygonal shape of recesses 20b. Due to the shape and arrangement of the recesses, a targeted influencing of the passing through the nozzle ring 7 sighting gas 8 can be achieved. The homogenization in the annular space 9 ensures that the currents in the region of all recesses are equal or approximately equal. If the collar takes the shape of the horizontal ring plate 22, of course, corresponding recesses can also be provided there.
- FIGS. 8a and 8c shows an arrangement with four gas inlets 10, 11, 12, 13 with helical walls 14, 15, 16 and 17 arranged therebetween.
- the embodiments described above are characterized by a clean flow of the nozzle ring 7 with a swirling, circular flow, wherein a flow reversal in front of the nozzle ring is avoided by the collar 20 or the forming bulk cone 23.
- the amount of material that is not entrained by the classifying gas 8 and instead falls down through the nozzle ring can be significantly reduced.
- sucking in air from above the nozzle ring is avoided by the flow according to the invention of the nozzle ring. This also improves the sighting. Due to the recesses in the collar, the air volume distribution in the nozzle ring can be adapted flexibly to the needs. A uniform velocity distribution over the entire nozzle ring also ensures better flow of the classified classifier. 4
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 |
---|---|---|---|
DE102012107127.6A DE102012107127B4 (de) | 2012-08-03 | 2012-08-03 | Vertikalrollenmühle |
PCT/EP2013/064044 WO2014019794A2 (de) | 2012-08-03 | 2013-07-03 | Vertikalrollenmühle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2879798A2 true EP2879798A2 (de) | 2015-06-10 |
EP2879798B1 EP2879798B1 (de) | 2016-09-07 |
Family
ID=48790394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13736839.5A Not-in-force EP2879798B1 (de) | 2012-08-03 | 2013-07-03 | Vertikalrollenmühle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2879798B1 (de) |
DE (1) | DE102012107127B4 (de) |
DK (1) | DK2879798T3 (de) |
WO (1) | WO2014019794A2 (de) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB313845A (en) * | 1929-01-07 | 1929-06-20 | Ernst Curt Loesche | Improvements in or relating to crushing mills |
AT122554B (de) * | 1929-01-07 | 1931-04-25 | Ernst Curt Loesche | Mühle. |
DE828192C (de) | 1948-10-02 | 1952-01-17 | Babcock & Wilcox Dampfkessel W | Kugelringmuehle |
DE852646C (de) * | 1949-10-23 | 1952-10-16 | Babcock & Wilcox Dampfkessel W | Kugelringmuehle |
US4522343A (en) * | 1982-12-13 | 1985-06-11 | Williams Patent Crusher And Pulverizer Company | Micronized grinding apparatus |
DE3717976A1 (de) | 1987-05-27 | 1988-12-08 | Krupp Polysius Ag | Verfahren und anlage zur zerkleinerung von mahlgut |
GB2214106B (en) | 1987-12-24 | 1991-06-26 | Smidth & Co As F L | Vertical roller mill |
DE3839419A1 (de) | 1988-11-22 | 1990-05-23 | Krupp Polysius Ag | Vorrichtung zur materialzufuehrung zu einem anlagenteil |
US7252253B2 (en) * | 2003-05-13 | 2007-08-07 | Bharat Heavy Electricals Ltd. | Bowl mill for a coal pulverizer with an air mill for primary entry of air |
CN201807409U (zh) | 2010-09-29 | 2011-04-27 | 莱歇研磨机械制造(上海)有限公司 | 一种用于辊式磨机的多边形可调节风环 |
-
2012
- 2012-08-03 DE DE102012107127.6A patent/DE102012107127B4/de not_active Expired - Fee Related
-
2013
- 2013-07-03 WO PCT/EP2013/064044 patent/WO2014019794A2/de active Application Filing
- 2013-07-03 EP EP13736839.5A patent/EP2879798B1/de not_active Not-in-force
- 2013-07-03 DK DK13736839.5T patent/DK2879798T3/da active
Non-Patent Citations (1)
Title |
---|
See references of WO2014019794A2 * |
Also Published As
Publication number | Publication date |
---|---|
DK2879798T3 (da) | 2017-01-02 |
WO2014019794A3 (de) | 2014-04-03 |
DE102012107127B4 (de) | 2017-08-17 |
DE102012107127A1 (de) | 2014-02-06 |
WO2014019794A2 (de) | 2014-02-06 |
EP2879798B1 (de) | 2016-09-07 |
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