EP2804696A1 - Verfahren und vertikalmühle zum mahlen von mahlgut - Google Patents
Verfahren und vertikalmühle zum mahlen von mahlgutInfo
- Publication number
- EP2804696A1 EP2804696A1 EP13719029.4A EP13719029A EP2804696A1 EP 2804696 A1 EP2804696 A1 EP 2804696A1 EP 13719029 A EP13719029 A EP 13719029A EP 2804696 A1 EP2804696 A1 EP 2804696A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- gas flow
- vertical mill
- cone
- flow
- 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
- 238000000227 grinding Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000004888 barrier function Effects 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 11
- 230000001174 ascending effect Effects 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 7
- 239000003570 air Substances 0.000 claims description 3
- 239000012080 ambient air Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 14
- 230000000630 rising effect Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 63
- 230000032258 transport Effects 0.000 description 20
- 239000010419 fine particle Substances 0.000 description 7
- 230000006872 improvement Effects 0.000 description 4
- 230000001976 improved effect Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000007704 transition Effects 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
- 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
- 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
Definitions
- the invention relates to a method for grinding regrind in a vertical mill according to the preamble of claim 8 and a vertical mill according to the preamble of claim 1.
- a vertical mill according to the preamble of claim 1 is known for example from EP 1 675 683 B1 and shown in a schematic manner with the essential components in FIG.
- Such a vertical mill has a rotating grinding table 3, are provided on the grinding rollers 4 or grinding rollers for crushing and grinding of the, for example, as cement clinker or raw coal in the central region of the grinding bowl 3 abandoned ground material.
- the vertical mill 30 is traversed from the bottom to the top, depending on the type of grinding stock fed onto the grinding bowl 3, from a main gas flow 14, which is usually a hot gas flow in a grinding-drying process.
- a main gas flow 14 which is usually a hot gas flow in a grinding-drying process.
- annular channel with a blade ring from the bottom blown hot gas which serves as a transport and drying gas, largely guided by the limitation of the mill housing 1 1 in a vertical transport flow for ground particles upwards.
- the particles guided upwards are classified by means of a classifier 9, which is expediently designed as a dynamic, rotating classifier. Larger particles of the ground material rejected by the sifter are returned to the grinding plate 3 for further grinding by the grit cone 6 arranged underneath.
- This effect of the recirculation and flow around the grinding rolls, in particular of fine particles, increases with increasing mill size and in particular with increasing diameter of the grinding bowl 3.
- the invention is therefore based on the invention to design a generic vertical mill so that an improvement in operating efficiency, in particular by avoiding the recirculation of fine particles is achieved, and this can also be implemented in a corresponding method.
- a complementary core idea is to divert a portion of the total required for a Mahltrockmuddy in the vertical mill transport and drying gas stream before entering the annular channel with blade ring, below the grinding bowl and this partial gas flow instead above the grinding rollers at the level of the exit from the Griessekonus to introduce this partial gas or sealing gas flow from the inside to the outside in the vertical mill.
- this sealing gas flow is distributed over 360 ° evenly distributed in the region of the annular gap distance. Constructively, this can be done by means of a ring channel or a ring line on the outside of the lower portion of the spit cone.
- the sealing gas flow can expediently be viewed in terms of volume as well as distributed in a sectoral manner over 360 ° in such a way that a stronger blocking gas flow is provided in areas of an increased fine material attack.
- the feed device for the sealing gas flow is fluidically designed at the lower region of the spit cone as this surrounding gas channel, so that the sealing gas flow with the flow direction outwardly produces a derivative of the annular gap distance led fines and this deflects in the ascending transport and drying gas flow.
- the operating efficiency of the vertical mill is improved as a relation between discharged, intended fines and required total energy of the vertical mill.
- the gas channel is implemented circumferentially in the lower region of the spout cone with a plurality of annular channel segments.
- a further improvement is also achieved in that a bypass line for the sealing gas flow is branched off from the main supply line of the vertical mill for the transport and drying gas.
- the barrier gas flow can also be introduced as a separate gas flow, in particular as ambient air or fresh air, in the corresponding feeder.
- the flow direction of the cooling gas is in this case directed from the outside inwards and is used solely for cooling and reducing the temperature of ground particles, for example of rising fines during the grinding of cement clinker.
- the internally outwardly directed sealing gas flow is provided with a vertical flow component, so that a favorable flow transition is generated together with the vertically rising transport gas flow.
- the spit cone can also be cylindrical, in particular in the lower region Have shape that extends into the space of opposing, largely vertically oriented grinding rollers.
- the invention solves the underlying object with the features of claim 8.
- a sealing gas flow is generated with the flow direction from the inside to the outside in and / or over the annular gap distance, so that an influx and recirculation of fines in the gap distance can be prevented.
- the sealing gas flow is expediently branched off via a bypass line as part of the main gas flow generated for the vertical mill for transport and drying gas, this being realized in particular below the grinding plate.
- the ascending transport and / or drying gas flow is thereby increased in volume, whereby the pneumatic delivery of the ground particles is improved.
- Another advantage is achieved when the volume and / or the temperature of the barrier gas flow is adjustable and this is done in particular as a function of the desired fine material.
- Fines particles are no longer recycled as part of a recirculation on the grinding table and thus on the grinding bed, but reach the sifter. As a result, the condition of the grinding bed is positively influenced and reduces the tendency to vibrate.
- the proportions of the finished or fine material in the material circulation within the vertical mill are reduced, which leads to an overall relief of the pneumatic transport in the vertical mill and thus increases the throughput and reduces the pressure loss.
- the gas velocity in the annular channel with blade ring decreases by the proportion of bypass gas branched off in the bypass, whereby the pressure loss is lowered significantly.
- the reduced gas velocity in the blade ring allows the operation of the vertical mill with a controlled Reject, which in turn lowers the pressure loss in the vertical mill, because oversized grinding particles are then no longer recycled pneumatically, but can be recycled in an external mechanical circulation, for example by bucket elevator.
- the invention can therefore be used in all types of vertical mills, in which there is a cross-sectional widening above the rollers for the transport and drying gas flow, since in this area in particular the problem of recirculating fine particles.
- FIG. 1 shows a very schematic representation of a vertical section through a vertical mill according to the invention with a bypass line and a sealing gas flow to the outside;
- Fig. 2 the vertical mill of FIG. 1 with a sealing gas flow with vertical
- FIG. 3 shows a vertical mill according to the prior art in a schematic vertical section with the essential components according to FIG. 1, but with the problematic and avoidable recirculation flow for fines in an annular gap between the grinding rolls and the tapping cone.
- a partial flow is diverted via the bypass line 17 from the main gas flow 14.
- the grinding process carried out in the vertical mill is a grinding-drying process, for example for moist raw coal
- hot gas is produced in a hot gas generator and fed as main gas flow 14 to the vertical mill 1 below the grinding plate 3.
- the diversion of the partial gas flow via the bypass line 17 takes place here below the grinding plate 3 or outside of the mill housing 1 first This is shown schematically by the arrows 15 as flow through the annular channel 5 with blade ring.
- This flow 15 transports the milling particles ground between grinding rolls 4 and grinding plates 3 and guided outwards into the area of the annular channel 5 largely vertically upward.
- This pneumatic transport function is particularly dependent on the flow rate and the flow volume of the transport and drying gas.
- a sealing gas flow 22 is generated from the inside to the outside to shield the annular gap 21 against entry of fines in this area in the lower region of the seminal cone 6.
- This blocking gas flow 22 was branched off from the main gas flow 14 as a bypass flow 16 and introduced via the bypass line 17 and the feed device 18 into a ring channel 19 enclosing the spout cone 6 and there over the entire circumference of the annular channel 19 as a sealing gas flow 22 with flow direction from inside to outside in the free space for the transport flow 24 is blown.
- the bypass line 17 is guided here above the grinding rollers 4 approximately horizontally through the mill housing 1 1 on a short path to the outer surface of the Griessekonus 6 and passed in the example shown a short distance on Griessekonus 6 down to the annular channel 19.
- the annular channel 19 can be flowed through circumferentially in one direction through the bypass flow 16.
- the annular channel 19 can also have, for example, two 180 ° segments which are flowed through in the opposite direction.
- bypass lines 17 each offset by 120 ° with one of three annular channel segments 19 may be fluidly connected.
- the blocking gas flow 22 in Fig. 1 blocked in the upper, inner region of the annular gap 21 against ingress of fines. Farther out, the barrier gas flow is diverted upward into the vertical transport flow 24 so that there is a larger volume upward flow for milled particles.
- the sealing gas flow 22 can be controlled depending on the outlet volume, outlet velocity and exit angle from the annular channel 19 so that a recirculation of fine particles above a certain fineness is prevented and is supplied to the sifter 9 with the vertical transport flow 24 upwards.
- the blocking gas flow 22 should therefore be adjusted so that over-ground, but coarser Mahlgutpenie be recycled through the annular gap 21 to the grinding table 3.
- the diversion of the bypass flow as a barrier gas flow for preventing tion of a recirculation of sintered particle sizes through the annular gap 21 ultimately leads to an improvement in the energy balance of the vertical mill compared to the discharged, desired fines.
- FIG. 2 corresponds, apart from the sealing gas flow 25, the embodiment of FIG. 1st
- the barrier gas flow 25 exiting through the annular channel 19 above the annular gap 21, in addition to an outwardly directed flow component, also has a vertical flow component.
- this allows the blocking of an entry of fines of specific fineness into the annular gap 21 and, on the other hand, a fluidically favorable coalescence with the ascending transport flow 24 so that a homogenization but also an increase in the volume of the transport flow 24 is achieved.
- the upwardly emerging from the separator fluid flow 26 is a fine material-gas mixture from which the fines are deposited in downstream cyclones and / or filters.
- the device according to the invention and the method therefore provide a relatively simple possibility of being able to realize a more efficient operation of such a vertical mill by blocking the recirculation of certain particle sizes.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2013/056418 WO2014075815A1 (de) | 2013-03-26 | 2013-03-26 | Verfahren und vertikalmühle zum mahlen von mahlgut |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2804696A1 true EP2804696A1 (de) | 2014-11-26 |
EP2804696B1 EP2804696B1 (de) | 2016-08-31 |
Family
ID=48190912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13719029.4A Not-in-force EP2804696B1 (de) | 2013-03-26 | 2013-03-26 | Verfahren und vertikalmühle zum mahlen von mahlgut |
Country Status (8)
Country | Link |
---|---|
US (1) | US9643191B2 (de) |
EP (1) | EP2804696B1 (de) |
CN (1) | CN104640634B (de) |
DK (1) | DK2804696T3 (de) |
IN (1) | IN2015DN01562A (de) |
MX (1) | MX2015003261A (de) |
TW (1) | TW201501800A (de) |
WO (1) | WO2014075815A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6355865B1 (ja) * | 2015-06-01 | 2018-07-11 | エフ・エル・スミス・エー・エス | 縦型ローラミル |
CN106423414B (zh) * | 2015-08-21 | 2018-10-23 | 南京凯盛国际工程有限公司 | 物料粉磨系统 |
DE102016121926B4 (de) * | 2016-11-15 | 2019-12-24 | Neuman & Esser Process Technology Gmbh | Mühle |
CN107014221B (zh) * | 2017-05-18 | 2023-03-31 | 华北理工大学 | 一种振动式多层变截面膜式壁湍流颗粒换热装置 |
CN109806531B (zh) * | 2019-01-30 | 2020-04-24 | 河南理工大学 | 一种低碳气体水合物粉碎抑爆装置 |
CN111617867B (zh) * | 2020-05-13 | 2021-09-21 | 南阳中联卧龙水泥有限公司 | 一种原料粉磨系统 |
CN112044533B (zh) * | 2020-08-14 | 2021-11-09 | 南京钜力智能制造技术研究院有限公司 | 一种智能立磨装置及其磨制方法 |
CN114749244B (zh) * | 2022-03-25 | 2024-02-20 | 衡水恒伟化工有限公司 | 一种可湿性粉剂农药粉碎设备及粉碎工艺 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2008973B (en) * | 1977-10-24 | 1982-05-26 | Babcock & Wilcox Ltd | Grinding mills |
US4597537A (en) * | 1982-09-14 | 1986-07-01 | Onoda Cement Company, Ltd. | Vertical mill |
GB2181971B (en) * | 1985-10-29 | 1988-11-09 | Smidth & Co As F L | Vertical roller mill |
DE4423815C2 (de) * | 1994-07-06 | 1996-09-26 | Loesche Gmbh | Mühlensichter |
ES2152476T3 (es) * | 1996-11-15 | 2001-02-01 | Doumet Joseph E Dipl Ing | Metodo y molino de rodillos para secar y triturar material de suministro humedo. |
AU2003304274A1 (en) | 2003-07-07 | 2005-01-21 | Gopinath Baddepudi | Multi knife cutting device |
JP4477635B2 (ja) | 2003-09-12 | 2010-06-09 | ロエシェ ゲーエムベーハー | ローラ粉砕ミル及びその運転方法並びにセメントの製造方法 |
DE102005040519B4 (de) * | 2005-08-26 | 2009-12-31 | Loesche Gmbh | Verfahren und Vorrichtung zur Vermahlung von heißem und feuchtem Rohmaterial |
US9289772B2 (en) * | 2013-08-01 | 2016-03-22 | Storm Technologies, Inc. | System for improving airflow characteristics within a coal pulverizer |
-
2013
- 2013-03-26 WO PCT/EP2013/056418 patent/WO2014075815A1/de active Application Filing
- 2013-03-26 EP EP13719029.4A patent/EP2804696B1/de not_active Not-in-force
- 2013-03-26 DK DK13719029.4T patent/DK2804696T3/en active
- 2013-03-26 US US14/427,270 patent/US9643191B2/en active Active
- 2013-03-26 CN CN201380048166.4A patent/CN104640634B/zh not_active Expired - Fee Related
- 2013-03-26 MX MX2015003261A patent/MX2015003261A/es unknown
-
2014
- 2014-03-25 TW TW103111006A patent/TW201501800A/zh unknown
-
2015
- 2015-02-25 IN IN1562DEN2015 patent/IN2015DN01562A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2014075815A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2804696B1 (de) | 2016-08-31 |
US20150246357A1 (en) | 2015-09-03 |
MX2015003261A (es) | 2015-10-08 |
US9643191B2 (en) | 2017-05-09 |
WO2014075815A1 (de) | 2014-05-22 |
IN2015DN01562A (de) | 2015-07-03 |
CN104640634A (zh) | 2015-05-20 |
DK2804696T3 (en) | 2016-12-12 |
TW201501800A (zh) | 2015-01-16 |
CN104640634B (zh) | 2017-06-23 |
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