EP2804696B1 - Procédé et broyeur vertical pour le broyage de matière - Google Patents

Procédé et broyeur vertical pour le broyage de matière Download PDF

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Publication number
EP2804696B1
EP2804696B1 EP13719029.4A EP13719029A EP2804696B1 EP 2804696 B1 EP2804696 B1 EP 2804696B1 EP 13719029 A EP13719029 A EP 13719029A EP 2804696 B1 EP2804696 B1 EP 2804696B1
Authority
EP
European Patent Office
Prior art keywords
grinding
gas flow
vertical mill
flow
transport
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.)
Not-in-force
Application number
EP13719029.4A
Other languages
German (de)
English (en)
Other versions
EP2804696A1 (fr
Inventor
Matthias Mersmann
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.)
Loesche GmbH
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Loesche GmbH
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Filing date
Publication date
Application filed by Loesche GmbH filed Critical Loesche GmbH
Publication of EP2804696A1 publication Critical patent/EP2804696A1/fr
Application granted granted Critical
Publication of EP2804696B1 publication Critical patent/EP2804696B1/fr
Not-in-force 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
    • 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 for example from EP 1 675 683 B1 known and in a schematic way with the essential components in Fig. 3 shown.
  • 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 bottom to top, depending on the nature of the ground material fed to 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.
  • the hot gas blown in from below which serves as transport and drying gas, is largely guided upwards by the boundary of the mill housing 11 into a vertical transport flow for ground particles.
  • 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.
  • the invention is therefore based on the object to design a generic vertical mill so that an improvement in the operating efficiency, in particular by avoiding the recirculation of fine particles is achieved, and this can also be implemented in a corresponding method.
  • a central idea of the invention can be seen to provide a supply for a sealing gas flow in the lower region of the spit cone, the flow direction leads from the inside to the outside and finely particulate from the annular gap distance between the outlet of the spout cone and the upper portion of the grinding rollers and thus a recirculation of these fine particles avoids.
  • 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 aerodynamically 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 guided fines and this deflects in the ascending transport and drying gas flow. It is therefore realized a pneumatic barrier at the annular gap distance between Griessekonus and grinding rollers. As a result, 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. This allows an inflow of the sealing gas seen with approximately the same pressure over the circumference of the spit cone. On the other hand, a better rising of the transport and drying gas is made possible on the outer conical surface of the Griessekonus in the remaining free distances between the individual annular channel segments.
  • a further improvement is also achieved by diverting a bypass line for the sealing gas flow 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. This also makes it possible to reduce the transport gas volume ascending through the annular channel around the grinding plate.
  • 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.
  • the invention achieves several improved effects. 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. Overall, therefore, an improvement in the operating performance and operating efficiency is achieved.
  • 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.
  • FIGS. 1 . 2 and 3 shown vertical mills have in view of the essential components such as grinding table 3, grinding rollers 4, Griesseus 6 and arranged above sifter 9 with enclosing mill housing 11 same structure.
  • a partial flow via the bypass line 17 In the example of the vertical mill 1 after Fig. 1 is diverted from the main gas flow 14, a partial flow via the bypass line 17.
  • 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 11.
  • This is shown schematically by the arrows 15 as a 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.
  • annular gap 21 can fall back through the already ground millbase on the grinding table 3 or is returned. With regard to rising fine particles in the flow 15, however, this is prevented in that 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 feeder 18 in an annular channel 19 surrounding the Griesseus 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 blown.
  • the bypass line 17 is guided here above the grinding rollers 4 approximately horizontally through the mill housing 11 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 traversed circumferentially in one direction through the bypass flow 16. In order to create approximately the same pressure conditions for the outflowing sealing gas flow 22, 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 sealing 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, exit 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 Mahlgutp
  • the diversion of the bypass flow as a barrier gas flow to prevent a recirculation of certain 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 according to Fig. 1 , In Fig. 2
  • the fluid flow 26 exiting the sifter is a fines-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.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Claims (12)

  1. Broyeur vertical (1) pour broyer de la matière de broyage,
    avec un plateau de broyage (3) et plusieurs rouleaux broyeurs (4) ou cylindres broyeurs (4) agencés sur ce plateau de sorte à être rotatifs,
    avec un canal annulaire (5) entourant le plateau de broyage (3) pour l'introduction d'un flux ascendant de gaz de séchage et/ou de transport (15),
    avec un cône de grains (6) se rétrécissant vers le bas, au milieu du plateau de broyage (3), agencé à peu près au-dessus des rouleaux broyeurs ou cylindres broyeurs (4), pour ramener des grains grossières sur le plateau de broyage (3), et
    avec un écart d'espacement (21) en forme plus ou moins d'anneau entre la zone inférieure de sortie du cône de grains (6) et la zone supérieure des rouleaux broyeurs ou cylindres broyeurs (4), en particulier pour l'exécution du procédé selon la revendication 8,
    caractérisé en ce que
    dans la zone inférieure du cône de grains (6), un dispositif d'alimentation (18) est prévu pour un flux de gaz (22) avec une direction de flux allant de l'intérieur vers l'extérieur pour la dérivation de particules fines conduites jusqu'à l'écart d'espacement en forme d'anneau (21) vers le flux de gaz de séchage et/ou de transport (15, 24) ascendant.
  2. Broyeur vertical selon la revendication 1
    caractérisé en ce que
    le dispositif d'alimentation (18) est conçu comme étant la partie inférieure du conduit de gaz (19) entourant le cône de grains (6).
  3. Broyeur vertical selon la revendication 2
    caractérisé en ce que
    le conduit de gaz entoure tout le tour de la partie inférieure du cône de grains en tant que conduit annulaire (19) ou avec plusieurs segments de conduit annulaire.
  4. Broyeur vertical selon l'une des revendications 2 à 3,
    caractérisé en ce que
    le conduit de gaz (19) du dispositif d'alimentation (18) est prévu, pour le flux de gaz agissant tout particulièrement en tant que flux de gaz d'obturation (22), en tant que conduit de dérivation (17) par rapport au conduit principal d'alimentation (14) du broyeur vertical (1) pour le gaz de séchage et/ou de transport (15, 24).
  5. Broyeur vertical selon une des revendications 1 à 3,
    caractérisé en ce que
    un flux de gaz d'obturation (22) est alimenté séparément du flux de gaz de transport (15, 24), en particulier en tant qu'air ambiant ou air frais.
  6. Broyeur vertical selon une des revendications 1 à 5,
    caractérisé enceque
    le flux de gaz d'obstruction (22) présente un composant de flux (25) dirigé de l'intérieur vers l'extérieur et un composant de flux (25) vertical.
  7. Un broyeur vertical selon une des revendications 1 à 6,
    caractérisé enceque
    le cône de grains (6) présente, en particulier dans la zone inférieure, une forme cylindrique atteignant l'espace libre de cylindres broyeurs (4) face à face et dirigés considérablement verticalement,
    de sorte que le volume de l'espace (27) est uniformisé dans le broyeur vertical (1) pour le flux de gaz de séchage et/ou de transport (15, 24) remontant dans la zone des rouleaux broyeurs ou cylindres broyeurs (4) et dans le cône de grains (6).
  8. Procédé pour le broyage de matière de broyage dans un broyeur vertical (1) qui présente un plateau de broyage (3) et au moins un rouleau broyeur ou cylindre broyeur (4) agencé sur ce plateau de sorte à être rotatif,
    tandis qu'un flux de gaz de séchage et/ou de transport (15) ascendant est introduit via un conduit annulaire (5) entourant le plateau de broyage (3), en particulier un conduit annulaire à couronnes d'aubes,
    tandis que des grains grossières sont reconduites sur le plateau de broyage via un cône de grains (6) se rétrécissant vers le bas, agencé au milieu du plateau de broyage (3), à peu près au-dessus des rouleaux broyeurs ou cylindres broyeurs (4),
    tandis qu'un écart d'espacement (21) en forme d'anneau se forme entre la zone de sortie inférieure du cône de grains (6) et la partie supérieure du rouleau broyeur ou du cylindre broyeur (4),
    caractérisé en ce que
    dans la zone inférieure du cône de grains (6), un flux de gaz d'obstruction (22) est alimenté avec une direction de flux allant de l'intérieur vers l'extérieur dans et/ou via l'écart d'espacement (21) en forme d'anneau, en particulier contre un flux entrant et une remise en circulation de particules fines dans l'écart d'espacement (21).
  9. Procédé selon la revendication 8
    caractérisé en ce que
    le flux de gaz d'obturation (22), en tant que partie du flux de gaz principal (14) pour le gaz de séchage et de transport (15, 24) produit pour le broyeur vertical (1), est dérivé, en particulier en dessous du plateau de broyage (3).
  10. Procédé selon la revendication 8
    caractérisé en ce que
    le flux de gaz d'obstruction (22) est alimenté dans le flux de gaz de transport ascendant en tant que flux de gaz externe, en particulier en tant qu'air ambiant ou air frais.
  11. Procédé selon une des revendications 8 à 9
    caractérisé en ce que
    le flux de gaz d'obstruction (25) alimenté en tant que flux de gaz partiel (16) est injecté avec un composant de flux vertical et
    le flux de gaz de séchage et/ou de transport (15, 24) ascendant est ainsi renforcé du point de vue du volume.
  12. Procédé selon une des revendications 8 à 11
    caractérisé en ce que
    le volume et/ou la température du flux de gaz d'obstruction (22, 25) sont réglés, en particulier en tant que fonction des particules (26) fines visées.
EP13719029.4A 2013-03-26 2013-03-26 Procédé et broyeur vertical pour le broyage de matière Not-in-force EP2804696B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/056418 WO2014075815A1 (fr) 2013-03-26 2013-03-26 Procédé et broyeur vertical pour le broyage de matière

Publications (2)

Publication Number Publication Date
EP2804696A1 EP2804696A1 (fr) 2014-11-26
EP2804696B1 true EP2804696B1 (fr) 2016-08-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13719029.4A Not-in-force EP2804696B1 (fr) 2013-03-26 2013-03-26 Procédé et broyeur vertical pour le broyage de matière

Country Status (8)

Country Link
US (1) US9643191B2 (fr)
EP (1) EP2804696B1 (fr)
CN (1) CN104640634B (fr)
DK (1) DK2804696T3 (fr)
IN (1) IN2015DN01562A (fr)
MX (1) MX2015003261A (fr)
TW (1) TW201501800A (fr)
WO (1) WO2014075815A1 (fr)

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CN111617867A (zh) * 2020-05-13 2020-09-04 南阳中联卧龙水泥有限公司 一种原料粉磨系统

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ES2928066T3 (es) * 2015-06-01 2022-11-15 Smidth As F L Molino de rodillos vertical
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
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

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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
DK0842702T3 (da) * 1996-11-15 2001-02-26 Doumet Joseph E Dipl Ing Fremgangsmåde og valsemølle til tørring og formaling af fugtigt fødemateriale
WO2005002811A1 (fr) 2003-07-07 2005-01-13 Gopinath Baddepudi Dispositif de coupe a couteaux multiples
EP1675683B1 (fr) 2003-09-12 2011-03-02 Loesche GmbH Procédé d'utilisation d'un broyeur à cylindres, et procédé de production de ciment
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Publication number Priority date Publication date Assignee Title
CN111617867A (zh) * 2020-05-13 2020-09-04 南阳中联卧龙水泥有限公司 一种原料粉磨系统

Also Published As

Publication number Publication date
DK2804696T3 (en) 2016-12-12
US9643191B2 (en) 2017-05-09
CN104640634A (zh) 2015-05-20
IN2015DN01562A (fr) 2015-07-03
WO2014075815A1 (fr) 2014-05-22
US20150246357A1 (en) 2015-09-03
MX2015003261A (es) 2015-10-08
EP2804696A1 (fr) 2014-11-26
CN104640634B (zh) 2017-06-23
TW201501800A (zh) 2015-01-16

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