EP0794008B1 - Ball mill - Google Patents

Ball mill Download PDF

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Publication number
EP0794008B1
EP0794008B1 EP97400482A EP97400482A EP0794008B1 EP 0794008 B1 EP0794008 B1 EP 0794008B1 EP 97400482 A EP97400482 A EP 97400482A EP 97400482 A EP97400482 A EP 97400482A EP 0794008 B1 EP0794008 B1 EP 0794008B1
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EP
European Patent Office
Prior art keywords
cylinder
separator
pipework
coal
drum
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.)
Expired - Lifetime
Application number
EP97400482A
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German (de)
French (fr)
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EP0794008A1 (en
Inventor
Daniel Fontanille
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Alstom Power Boiler SA
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Alstom Energy Systems SA
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Publication date
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Publication of EP0794008A1 publication Critical patent/EP0794008A1/en
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    • 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
    • B02C17/183—Feeding or discharging devices
    • B02C17/1835—Discharging devices combined with sorting or separating of material
    • B02C17/184—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone
    • B02C17/1845—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone with return of oversize material to crushing 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
    • 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
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • B02C17/1865—Adding fluid, other than for crushing by fluid energy after crushing
    • B02C17/187—Adding fluid, other than for crushing by fluid energy after crushing with recirculation of material to crushing 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
    • 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
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
    • B02C17/189—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone with return of oversize material to crushing zone

Definitions

  • the present invention relates to a cannonballs.
  • a ball mill substantially horizontal axis of rotation comprising a drum supported by two pins of the same axis of rotation located at each end of said drum, a substantially vertical pipe, thanks to which the raw coal can be brought, arranged at proximity of a cylinder of the same axis of rotation arranged in each journal and opening into the drum and space between the journal and the cylinder being connected to a pulverized coal outlet pipe by through a separator.
  • each journal in each journal is arranged a hollow cylinder carrying on its outer surface an elastic Archimedes screw for raw coal supply on which falls the raw coal leaving the piping and that brings this coal into the drum. Air said main is injected into the drum from the inside of this cylinder, to drive the ground grains inside of the drum. The space between the pin and the screw serves of pulverized coal and is connected to the separator. Additional air is injected into the piping upstream of the separator.
  • a raw coal guide member is disposed under said piping for gravity driving the coal in said cylinder with a rigid Archimedes screw on its surface interior, a main air supply is provided upstream of the separator on said piping, this air being completely channeled towards the inside of the cylinder.
  • the main air supply by the cylinder allows a central injection in the direction of the axis of rotation of this air in the drum and ensures an effect optimal of it.
  • this main air can be easily controlled, the measurement of its flow allowing the determination of the quantity of pulverized coal leaving the mill.
  • the rigid Archimedes screw carried by the cylinder is construction less fragile than the elastic screw of art and is not subject to wear due to the fall of the coal.
  • the main air flow ensures a pre-drying of the efficient raw coal, regardless of the load of the mill.
  • the supply of raw coal and the evacuation of pulverized coal is made by two different paths. This ensures a good flow of the pulverized coal in the trunnion.
  • the separator may include air supply additional and / or said outlet pipe may include an additional air supply.
  • the additional air supply is control.
  • the guide member is a sheath of angled shape connected by its lower end to a end of the cylinder, the lower end of the raw coal supply piping being arranged above of this sheath.
  • Figure 1 shows a longitudinal sectional view of a coal grinding plant.
  • Figure 2 is a longitudinal sectional view of detail of a preferred embodiment of the invention.
  • the installation of coal grinding includes at least one device feed 10 feeding coal to a ball mill generally designated by reference 20.
  • the feed device 10 comprises a hopper of storage 1 from which the coal 2 is extracted which is brought by a chain conveyor 3 placed in a box 4 and driven by a motor 5, at a first end of a pipe substantially vertical 6.
  • the crusher 20 includes an axis of rotation drum substantially horizontal and comprising a central part cylindrical 11 terminated by two conical portions 12 and 13 to which are attached respectively two pins 14 and 15 of the same axis of rotation intended to support the drum.
  • the pins are placed respectively on two bearings 16 and 17 fitted with pads.
  • the crusher is driven in rotation by means of a toothed ring 18 cooperating with a pinion not shown driven by a gear motor electric not shown.
  • the grinder is filled with balls 27, for example steel.
  • the raw coal is supplied by pipe 6.
  • This piping 6 is equipped with an air supply 30 main.
  • a guide member 31 can be formed of an inclined plate fixed in a fixed tube 41 whose mouth opens into a cylinder 32 of the same axis than the drum and arranged opposite the end bottom of the pipe 6, a radial opening being produced in said tube 41 for the passage and the fall of the raw coal from this pipe 6 on the plate 31.
  • This last gravity drives raw coal into the cylinder 32 disposed in the pin 15, bearing on its inner surface a rigid metal Archimedes screw and opening into the drum.
  • This cylinder 32 is integral with the drum by arms, for example, and turns with it, its axis of rotation being the same as that of the drum.
  • the piping 6 is installed in the separator 33 and the raw coal as well as all of the main air is channeled towards the inside of cylinder 32 by a shape of the inclined plate 31 and by a conical member 34 at the bottom of the piping 6 preventing the air from rising at this level.
  • This conical organ has another function which will be seen later.
  • the resulting pulverized carbon is discharged into space 35 between the pin 15 and the cylinder 32 which is connected via separator 33 to a pipe outlet 36.
  • the pulverized coal therefore rises in the space between these two parts 33A and 33B and passes between the space included between the second part 33B and the piping 6 by orifices 33C to then evacuate in the line of exit 36.
  • FIG. 2 represents another embodiment of the invention.
  • the guide member 31 consists of an elbow-shaped sheath connected by its upper end at the lower mouth of the second tubular part 33B of separator 33 and by its end lower than the mouth of cylinder 32 via of a rotating joint.
  • the lower end of the piping supply of raw coal 6 is arranged above this sheath 31.
  • the mouth of the first tubular part 33A of the separator 33 is directly connected to pin 15 by another angled sheath 40 external by through a rotating joint.
  • An annular orifice 33C is arranged above the second part 33B and the first part 33A is extended by a tube coaxial with the pipe 6 and opening into the outlet line 36.
  • the raw coal therefore falls into the sheath 31 and slides in the cylinder 32 to be brought by the internal screw of the cylinder 32 in the drum.
  • the main air is sent to the drum by the same route.
  • the pulverized coal is evacuated into the space 35 between the pin 15 and the cylinder 32, in the space between the two sheaths 31, 40, between the two tubular parts of the separator 33 then in the baffle formed by orifice 33C and the extension of the first part 33A of the separator 33.
  • This embodiment has the advantage of presenting a total seal between the supply space raw coal and the pulverized coal discharge space.

Description

La présente invention se rapporte à un broyeur à boulets.The present invention relates to a cannonballs.

Elle concerne plus précisément un broyeur à boulets d'axe de rotation sensiblement horizontal comportant un tambour supporté par deux tourillons de même axe de rotation situés à chaque extrémité dudit tambour, une tuyauterie sensiblement verticale, grace à la quelle le charbon brut peut être amené, disposée à proximité d'un cylindre de même axe de rotation disposé dans chaque tourillon et débouchant dans le tambour et l'espace compris entre le tourillon et le cylindre étant connecté à une conduite de sortie du charbon pulvérisé par l'intermédiaire d'un séparateur.It relates more precisely to a ball mill substantially horizontal axis of rotation comprising a drum supported by two pins of the same axis of rotation located at each end of said drum, a substantially vertical pipe, thanks to which the raw coal can be brought, arranged at proximity of a cylinder of the same axis of rotation arranged in each journal and opening into the drum and space between the journal and the cylinder being connected to a pulverized coal outlet pipe by through a separator.

Dans un tel broyeur connu, dans chaque tourillon est disposé un cylindre creux portant sur sa surface extérieure une vis d'Archimède élastique d'alimentation en charbon brut sur laquelle tombe le charbon brut sortant de la tuyauterie et qui amène ce charbon dans le tambour. De l'air dit principal est injecté dans le tambour par l'intérieur de ce cylindre, afin d'entraíner les grains broyés à l'intérieur du tambour. L'espace entre le tourillon et la vis sert d'évacuation du charbon pulvérisé et est connecté au séparateur. De l'air additionnel est injecté dans la tuyauterie en amont du séparateur.In such a known mill, in each journal is arranged a hollow cylinder carrying on its outer surface an elastic Archimedes screw for raw coal supply on which falls the raw coal leaving the piping and that brings this coal into the drum. Air said main is injected into the drum from the inside of this cylinder, to drive the ground grains inside of the drum. The space between the pin and the screw serves of pulverized coal and is connected to the separator. Additional air is injected into the piping upstream of the separator.

Un tel broyeur est décrit par exemple dans la demande de brevet FR-2 721 711.Such a shredder is described for example in the application FR-2,721,711.

Ce type de broyeur posent les problèmes techniques suivants.This type of grinder poses technical problems following.

Il s'avère que l'air additionnel, en faible quantité, ne peut assurer un préséchage efficace du charbon, son débit étant faible à pleine charge du broyeur.It turns out that the additional air, in small quantity, cannot effectively pre-dry coal, its flow rate being weak at full load of the mill.

La chute du charbon brut sur les pales de la vis élastique entraíne une usure importante et rapide de celles-ci. Cette usure est accélérée par le passage du charbon pulvérisé mélangé à de l'air dans ledit espace entre le tourillon et la vis. The fall of the raw coal on the screw blades elastic causes significant and rapid wear thereof. This wear is accelerated by the passage of carbon sprayed mixed with air in said space between the pin and screw.

Dans cet espace, sont donc réalisées d'une part l'alimentation en charbon brut vers le tambour et d'autre part l'évacuation du charbon pulvérisé vers le séparateur. Ces deux flux de matières de direction opposée entraínent des turbulences et un écoulement perturbé créant des pertes de charges élevées et une mauvaise distribution de l'air et du charbon pulvérisé dans le séparateur.In this space, therefore, are performed on the one hand supply of raw coal to the drum and other apart from the evacuation of the pulverized coal towards the separator. These two material flows in opposite directions turbulence and disturbed flow creating losses high loads and poor air distribution and pulverized coal in the separator.

Pour résoudre ces problèmes, selon l'invention, un organe de guidage du charbon brut est disposé sous ladite tuyauterie entraínant par gravité le charbon dans ledit cylindre portant une vis d'Archimède rigide sur sa surface intérieure, une alimentation en air principal étant prévue en amont du séparateur sur ladite tuyauterie, cet air étant en totalité canalisé vers l'intérieur du cylindre.To solve these problems, according to the invention, a raw coal guide member is disposed under said piping for gravity driving the coal in said cylinder with a rigid Archimedes screw on its surface interior, a main air supply is provided upstream of the separator on said piping, this air being completely channeled towards the inside of the cylinder.

L'alimentation en air principal par le cylindre permet une injection centrale dans la direction de l'axe de rotation de cet air dans le tambour et assure un effet optimal de celui-ci.The main air supply by the cylinder allows a central injection in the direction of the axis of rotation of this air in the drum and ensures an effect optimal of it.

Par ailleurs, cet air principal peut être facilement contrôlé, la mesure de son débit permettant la détermination de la quantité de charbon pulvérisé sortant du broyeur.Besides, this main air can be easily controlled, the measurement of its flow allowing the determination of the quantity of pulverized coal leaving the mill.

La vis d'Archimède rigide portée par le cylindre est de construction moins fragile que la vis élastique de l'art antérieur et n'est pas soumise à l'usure due à la chute du charbon.The rigid Archimedes screw carried by the cylinder is construction less fragile than the elastic screw of art and is not subject to wear due to the fall of the coal.

Le débit d'air principal assure un préséchage du charbon brut efficace, quel que soit la charge du broyeur.The main air flow ensures a pre-drying of the efficient raw coal, regardless of the load of the mill.

L'alimentation en charbon brut et l'évacuation du charbon pulvérisé se font par deux chemin différents. Ceci assure un bon écoulement du charbon pulvérisé dans le tourillon.The supply of raw coal and the evacuation of pulverized coal is made by two different paths. This ensures a good flow of the pulverized coal in the trunnion.

Quant à l'alimentation en air additionnel, le séparateur peut comporter une alimentation en air additionnel et/ou ladite conduite de sortie peut comporter une alimentation en air additionnel. As for the additional air supply, the separator may include air supply additional and / or said outlet pipe may include an additional air supply.

Il est ainsi possible de répartir l'air additionnel entre le séparateur et la conduite de sortie du charbon pulvérisé pour assurer une régulation performante à tout instant.It is thus possible to distribute the additional air between the separator and the coal outlet pipe sprayed to ensure efficient regulation for everything instant.

De préférence, l'alimentation en air additionnel est contrôlé.Preferably, the additional air supply is control.

Ceci permet de réaliser un réglage dynamique de débit de charbon et d'obtenir un bon réglage de la puissance de la chaudière alimentée par la conduite de sortie du charbon pulvérisé.This allows dynamic flow adjustment of coal and get a good adjustment of the power of the boiler supplied by the coal outlet pipe sprayed.

Avantageusement, l'organe de guidage est une gaine de forme coudée connectée par son extrémité inférieure à une extrémité du cylindre, l'extrémité inférieure de la tuyauterie d'alimentation en charbon brut étant disposée au-dessus de cette gaine.Advantageously, the guide member is a sheath of angled shape connected by its lower end to a end of the cylinder, the lower end of the raw coal supply piping being arranged above of this sheath.

De préférence, le séparateur comporte deux parties tubulaires coaxiales d'axe vertical:

  • une première partie tubulaire extérieure connectée au tourillon par une gaine de forme coudée,
  • une seconde partie tubulaire intérieure dans laquelle est disposée l'extrémité inférieure de la tuyauterie et connectée par son extrémité inférieure à l'extrémité supérieure de l'organe de guidage,
   la première partie étant prolongée et connectée à ladite conduite de sortie et au moins un orifice de passage de l'espace entre les deux parties tubulaires vers l'intérieur de la seconde partie étant prévu.Preferably, the separator comprises two coaxial tubular parts with a vertical axis:
  • a first external tubular part connected to the trunnion by a bent sheath,
  • a second inner tubular part in which the lower end of the piping is disposed and connected by its lower end to the upper end of the guide member,
the first part being extended and connected to said outlet pipe and at least one orifice for passage of the space between the two tubular parts towards the inside of the second part being provided.

L'invention est décrite ci-après plus en détail à l'aide de figures ne représentant qu'un mode de réalisation préféré de l'invention.The invention is described below in more detail at using figures representing only one embodiment preferred of the invention.

La figure 1 représente une vue en coupe longitudinale d'une installation de broyage de charbon.Figure 1 shows a longitudinal sectional view of a coal grinding plant.

La figure 2 est une vue en coupe longitudinale de détail d'un mode de réalisation préféré de l'invention.Figure 2 is a longitudinal sectional view of detail of a preferred embodiment of the invention.

Comme visible sur la figure 1 l'installation de broyage de charbon comprend au moins un dispositif d'alimentation 10 alimentant en charbon un broyeur à boulets globalement désigné par la référence 20.As shown in Figure 1 the installation of coal grinding includes at least one device feed 10 feeding coal to a ball mill generally designated by reference 20.

Le dispositif d'alimentation 10 comprend une trémie de stockage 1 dont est extrait le charbon 2 qui est amené par un convoyeur à chaíne 3 placé dans un caisson 4 et entraíné par un moteur 5, à un première extrémité d'une tuyauterie sensiblement verticale 6.The feed device 10 comprises a hopper of storage 1 from which the coal 2 is extracted which is brought by a chain conveyor 3 placed in a box 4 and driven by a motor 5, at a first end of a pipe substantially vertical 6.

Le broyeur 20 comprend un tambour d'axe de rotation sensiblement horizontal et comportant une partie centrale cylindrique 11 terminée par deux portions coniques 12 et 13 auxquelles sont fixés respectivement deux tourillons 14 et 15 de même axe de rotation destinés à supporter le tambour. Les tourillons sont posés respectivement sur deux paliers 16 et 17 munis de coussinets. Le broyeur est entraíné en rotation grâce à une couronne dentée 18 coopérant avec un pignon non représenté entraíné par un moto-réducteur électrique non représenté. Le broyeur est garni de boulets 27, par exemple d'acier.The crusher 20 includes an axis of rotation drum substantially horizontal and comprising a central part cylindrical 11 terminated by two conical portions 12 and 13 to which are attached respectively two pins 14 and 15 of the same axis of rotation intended to support the drum. The pins are placed respectively on two bearings 16 and 17 fitted with pads. The crusher is driven in rotation by means of a toothed ring 18 cooperating with a pinion not shown driven by a gear motor electric not shown. The grinder is filled with balls 27, for example steel.

L'installation est symétrique et les agencements installés aux extrémités du tambour le sont également, comportant chacune une tuyauterie sensiblement verticale 6, 6' d'alimentation en charbon brut. La description qui suit ne concernera donc que l'un de ces agencements.The installation is symmetrical and the fittings installed at the ends of the drum are also installed, each comprising a substantially vertical pipe 6, 6 'of raw coal supply. The following description will therefore only concern one of these arrangements.

Le charbon brut est alimenté par la tuyauterie 6. Cette tuyauterie 6 est équipé d'une alimentation 30 en air principal. A l'extrémité inférieure de la tuyauterie 6, le charbon brut tombe sur un organe de guidage 31, qui peut être formé d'une plaque inclinée fixée dans un tube 41 fixe dont l'embouchure débouche dans un cylindre 32 de même axe que le tambour et disposée en vis-à-vis de l'extrémité inférieure de la tuyauterie 6, un orifice radial étant réalisé dans ledit tube 41 pour le passage et la chute du charbon brut de cette tuyauterie 6 sur la plaque 31. Cette dernière entraíne par gravité le charbon brut dans le cylindre 32 disposé dans le tourillon 15, portant sur sa surface intérieure une vis d'Archimède rigide métallique et débouchant dans le tambour. Ce cylindre 32 est solidaire du tambour par des bras, par exemple, et tourne avec celui-ci, son axe de rotation étant le même que celui du tambour. La tuyauterie 6 est installée dans le séparateur 33 et le charbon brut ainsi que la totalité de l'air principal est canalisé vers l'intérieur du cylindre 32 par une forme adéquate de la plaque inclinée 31 et par un organe conique 34 au bas de la tuyauterie 6 empêchant la remontée de l'air à ce niveau. Cet organe conique a une autre fonction qui sera vue plus loin.The raw coal is supplied by pipe 6. This piping 6 is equipped with an air supply 30 main. At the lower end of the pipe 6, the raw coal falls on a guide member 31, which can be formed of an inclined plate fixed in a fixed tube 41 whose mouth opens into a cylinder 32 of the same axis than the drum and arranged opposite the end bottom of the pipe 6, a radial opening being produced in said tube 41 for the passage and the fall of the raw coal from this pipe 6 on the plate 31. This last gravity drives raw coal into the cylinder 32 disposed in the pin 15, bearing on its inner surface a rigid metal Archimedes screw and opening into the drum. This cylinder 32 is integral with the drum by arms, for example, and turns with it, its axis of rotation being the same as that of the drum. The piping 6 is installed in the separator 33 and the raw coal as well as all of the main air is channeled towards the inside of cylinder 32 by a shape of the inclined plate 31 and by a conical member 34 at the bottom of the piping 6 preventing the air from rising at this level. This conical organ has another function which will be seen later.

Une fois le charbon brut broyé dans le tambour, le charbon pulvérisé résultant s'évacue dans l'espace 35 compris entre le tourillon 15 et le cylindre 32 qui est connecté par l'intermédiaire du séparateur 33 à une conduite de sortie 36.Once the raw coal is ground in the drum, the resulting pulverized carbon is discharged into space 35 between the pin 15 and the cylinder 32 which is connected via separator 33 to a pipe outlet 36.

Pour ce faire, le séparateur 33 comporte deux parties tubulaires coniques coaxiales d'axe vertical:

  • une première partie 33A extérieure connectée au tourillon 15,
  • une seconde partie 33B intérieure dans laquelle est disposée la tuyauterie 6 et connectée à la conduite de sortie 36.
To do this, the separator 33 comprises two conical tubular parts coaxial with a vertical axis:
  • a first external part 33A connected to the pin 15,
  • a second inner part 33B in which the piping 6 is arranged and connected to the outlet pipe 36.

Le charbon pulvérisé monte donc dans l'espace entre ces deux parties 33A et 33B et passe entre l'espace compris entre la seconde partie 33B et la tuyauterie 6 par des orifices 33C pour ensuite s'évacuer dans la conduite de sortie 36.The pulverized coal therefore rises in the space between these two parts 33A and 33B and passes between the space included between the second part 33B and the piping 6 by orifices 33C to then evacuate in the line of exit 36.

Au passage de ces orifices 33C, la trajectoire du charbon pulvérisé est en chicane et les particules les plus grosses tombent au bas de la seconde partie 33B, dont l'extrémité inférieure débouche dans l'orifice radial réalisé dans le tube 41, et sont recyclées avec le charbon brut, l'organe conique 34 permettant leur passage vers la plaque inclinée 31.As these orifices 33C pass, the trajectory of the pulverized coal is baffled and the most large fall at the bottom of the second part 33B, of which the lower end opens into the radial opening made in tube 41, and are recycled with charcoal gross, the conical member 34 allowing their passage to the inclined plate 31.

Deux alimentations en air additionnel peuvent être prévues:

  • l'une 37 au niveau du séparateur 33, à l'entrée de celui-ci, contrôlée par le dispositif 37A,
  • l'autre 38, en aval, sur la conduite de sortie 36, contrôlée par le dispositif 38A.
Two additional air supplies can be provided:
  • one 37 at the level of the separator 33, at the entry thereof, controlled by the device 37A,
  • the other 38, downstream, on the outlet pipe 36, controlled by the device 38A.

Il est possible de prévoir ces deux alimentations ou seulement l'une ou l'autre.It is possible to provide these two power supplies or only one or the other.

La figure 2 représente un autre mode de réalisation de l'invention.FIG. 2 represents another embodiment of the invention.

Selon ce mode de réalisation, l'organe de guidage 31 est constitué d'une gaine en forme de coude reliée par son extrémité supérieure à l'embouchure inférieure de la seconde partie tubulaire 33B du séparateur 33 et par son extrémité inférieure à l'embouchure du cylindre 32 par l'intermédiaire d'un joint tournant. L'extrémité inférieure de la tuyauterie d'alimentation en charbon brut 6 est disposée au-dessus de cette gaine 31.According to this embodiment, the guide member 31 consists of an elbow-shaped sheath connected by its upper end at the lower mouth of the second tubular part 33B of separator 33 and by its end lower than the mouth of cylinder 32 via of a rotating joint. The lower end of the piping supply of raw coal 6 is arranged above this sheath 31.

L'embouchure de la première partie tubulaire 33A du séparateur 33 est directement connectée au tourillon 15 par une autre gaine de forme coudée 40 externe par l'intermédiaire d'un joint tournant.The mouth of the first tubular part 33A of the separator 33 is directly connected to pin 15 by another angled sheath 40 external by through a rotating joint.

Un orifice annulaire 33C est agencé au-dessus de la seconde partie 33B et la première partie 33A se prolonge par un tube coaxial à la tuyauterie 6 et débouchant dans la conduite de sortie 36.An annular orifice 33C is arranged above the second part 33B and the first part 33A is extended by a tube coaxial with the pipe 6 and opening into the outlet line 36.

Le charbon brut tombe donc dans la gaine 31 et glisse dans le cylindre 32 pour être amené par la vis interne du cylindre 32 dans le tambour. L'air principal est envoyé dans le tambour par le même parcours. Le charbon pulvérisé est évacué dans l'espace 35 entre le tourillon 15 et le cylindre 32, dans l'espace entre les deux gaines 31, 40, entre les deux parties tubulaires du séparateur 33 puis dans la chicane formée par l'orifice 33C et le prolongement de la première partie 33A du séparateur 33.The raw coal therefore falls into the sheath 31 and slides in the cylinder 32 to be brought by the internal screw of the cylinder 32 in the drum. The main air is sent to the drum by the same route. The pulverized coal is evacuated into the space 35 between the pin 15 and the cylinder 32, in the space between the two sheaths 31, 40, between the two tubular parts of the separator 33 then in the baffle formed by orifice 33C and the extension of the first part 33A of the separator 33.

Ce mode de réalisation a pour avantage de présenter une étanchéité totale entre l'espace d'alimentation en charbon brut et l'espace d'évacuation du charbon pulvérisé.This embodiment has the advantage of presenting a total seal between the supply space raw coal and the pulverized coal discharge space.

Claims (6)

  1. A ball mill having a substantially horizontal axis of rotation and comprising a drum supported by two trunions (14, 15) having the same axis of rotation and situated at respective ends of said drum, and substantially vertical pipework (6, 6') by means of which raw coal can be conveyed, the pipework being disposed in the vicinity of a cylinder (32) having the same axis of rotation and disposed within each trunion (14, 15) so as to open out into the drum, with the space (35) lying between each trunion (15) and its cylinder (32) being connected to a pulverized coal outlet duct (36) via a separator (33), the mill being characterized in that a raw coal guide member (31) is disposed beneath said pipework (6), conveying coal under gravity into the inside of said cylinder (32) which includes a rigid Archimedes' screw on its inside surface, a main air feed (30) being provided on said pipework (6) upstream from the separator (33), all of said air being channeled towards the inside of the cylinder (32).
  2. A mill according to claim 1, characterized in that the separator (33) includes an additional air feed (37).
  3. A mill according to claim 1 or 2, characterized in that said outlet duct (36) includes an additional air feed (38).
  4. A mill according to claim 2 or 3, characterized in that the additional air feed (37, 38) is controlled.
  5. A mill according to any preceding claim, characterized in that the guide member (31) is an angled sheath connected via its bottom end to one end of the cylinder (32), with the bottom end of the raw coal feed pipework (6) being disposed above said sheath (31).
  6. A mill according to claim 5, characterized in that the separator (33) includes two coaxial tubular portions about a vertical axis:
    an outer, first tubular portion (33A) connected to the trunion (15) via an angled sheath (40); and
    an inner second tubular portion (33B) within which the bottom end of the pipework (6) is disposed and which is connected via its bottom end to the top end of the guide member (31);
       the first portion (33A) being extended and connected to said outlet duct (36) and at least one through orifice (33C) being provided from the space between the two tubular portions (33A, 33B) towards the inside of the second portion (33B).
EP97400482A 1996-03-08 1997-03-03 Ball mill Expired - Lifetime EP0794008B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9602953 1996-03-08
FR9602953A FR2745731B1 (en) 1996-03-08 1996-03-08 BALL MILL

Publications (2)

Publication Number Publication Date
EP0794008A1 EP0794008A1 (en) 1997-09-10
EP0794008B1 true EP0794008B1 (en) 2001-11-28

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EP97400482A Expired - Lifetime EP0794008B1 (en) 1996-03-08 1997-03-03 Ball mill

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US (1) US5873532A (en)
EP (1) EP0794008B1 (en)
CN (1) CN1071143C (en)
DE (1) DE69708479T2 (en)
DK (1) DK0794008T3 (en)
ES (1) ES2164998T3 (en)
FR (1) FR2745731B1 (en)
PT (1) PT794008E (en)
RU (1) RU2152825C2 (en)
UA (1) UA40654C2 (en)
ZA (1) ZA971942B (en)

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FR2793168B1 (en) 1999-05-07 2001-06-22 Alstom BALL MILL
CN100387349C (en) * 2005-06-01 2008-05-14 上海重型机器厂有限公司 Steel ball coal mill with dual inputs and dual outputs
FI122276B (en) * 2010-04-12 2011-11-15 Outotec Oyj Device for feeding mill bodies into a grinding mill
DE102012013279A1 (en) * 2012-07-05 2014-01-09 Roland Nied Method for operating a stirred ball mill and agitator ball mill therefor
RU2504434C1 (en) * 2012-10-09 2014-01-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кузбасский государственный технический университет имени Т.Ф. Горбачева" (КузГТУ) Device to define coal residual methane content
CN104338598B (en) * 2013-07-27 2017-11-10 枣庄福德通用机械有限公司 Coal petrography sample ore pulverizer
CN103521310A (en) * 2013-10-30 2014-01-22 江苏秋林重工股份有限公司 Ball mill unit for preparation of burning coal-water slurry
US10086379B2 (en) * 2015-02-27 2018-10-02 Aaron Engineered Process Equipment, Inc. Rotary mill
CN105597903A (en) * 2015-12-29 2016-05-25 中国矿业大学 Dust separating and gas drying and circulating system and dust separating and gas drying and circulating method of industrial ball grinding mill
CN106423420B (en) * 2016-09-20 2019-06-18 派勒（天津）纳米技术有限公司 A kind of dry type multistage intelligent agitating ball mill
CN107694697B (en) * 2017-11-14 2019-03-29 枣庄京弘电力材料有限公司 A kind of ball mill feed opening anti-block apparatus
CN107899707B (en) * 2017-12-14 2019-08-20 佛山市万良商贸有限公司 A kind of coal crushing classifying equipoment
CN108080112B (en) * 2017-12-14 2020-04-03 佛山市万良商贸有限公司 High-efficient broken classification equipment of power plant's coal
CN110523329A (en) * 2019-06-17 2019-12-03 江苏新美星包装机械股份有限公司 Vacuum device for inhaling powdery substances
CN114273025A (en) * 2021-09-27 2022-04-05 济南宏腾信息科技有限公司 Production method of artificial graphite negative electrode material
CN114932003A (en) * 2022-05-18 2022-08-23 北京干雾科技有限公司 Ball mill for sorting pebble coal
WO2024061389A1 (en) * 2022-09-21 2024-03-28 Vysoká Škola Báňská - Technická Univerzita Ostrava Device for separating acidic gas constituents from flue gases

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Also Published As

Publication number Publication date
ZA971942B (en) 1997-11-26
ES2164998T3 (en) 2002-03-01
RU2152825C2 (en) 2000-07-20
DK0794008T3 (en) 2002-03-18
EP0794008A1 (en) 1997-09-10
PT794008E (en) 2002-05-31
US5873532A (en) 1999-02-23
UA40654C2 (en) 2001-08-15
FR2745731A1 (en) 1997-09-12
DE69708479D1 (en) 2002-01-10
FR2745731B1 (en) 1998-04-17
DE69708479T2 (en) 2002-05-16
CN1162504A (en) 1997-10-22
CN1071143C (en) 2001-09-19

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