EP0234017B1 - Rotating drum mill for the preparation of a pulverulent material with two different qualities - Google Patents

Rotating drum mill for the preparation of a pulverulent material with two different qualities Download PDF

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Publication number
EP0234017B1
EP0234017B1 EP86117104A EP86117104A EP0234017B1 EP 0234017 B1 EP0234017 B1 EP 0234017B1 EP 86117104 A EP86117104 A EP 86117104A EP 86117104 A EP86117104 A EP 86117104A EP 0234017 B1 EP0234017 B1 EP 0234017B1
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Prior art keywords
pulverizer
fineness
pulverized
separator
grains
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EP86117104A
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German (de)
French (fr)
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EP0234017A1 (en
Inventor
Daniel Fontanille
Pierre Theilmann
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Stein Industrie SA
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Stein Industrie SA
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00Disintegrating 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
    • B02C17/18Details
    • B02C17/183Feeding or discharging devices
    • B02C17/186Adding fluid, other than for crushing by fluid energy
    • B02C17/1875Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
    • B02C17/189Adding fluid, other than for crushing by fluid energy passing gas through crushing zone with return of oversize material to crushing zone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00Disintegrating 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
    • B02C17/04Disintegrating 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 with unperforated container
    • B02C17/06Disintegrating 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 with unperforated container with several compartments
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00Auxiliary 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
    • B02C23/18Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/38Adding fluid, other than for crushing or disintegrating by fluid energy in apparatus having multiple crushing or disintegrating zones

Description

  • La présente invention concerne un broyeur cylindrique rotatif d'axe horizontal pour la préparation d'un matériau pulvérulent à deux degrés de finesse différents, avec organes d'introduction du matériau et d'un gaz de séchage, puis d'évacuation du matériau pulvérisé dans le gaz de séchage à travers ses tourillons, séparé par une cloison transversale en deux parties isolées l'une de l'autre, comprenant chacune ses organes d'introduction et d'évacuation du matériau et du gaz de séchage par le tourillon attenant.The present invention relates to a rotary cylindrical grinder with a horizontal axis for the preparation of a pulverulent material with two different degrees of fineness, with members for introducing the material and a drying gas, then for discharging the pulverized material into the drying gas through its trunnions, separated by a transverse partition into two parts isolated from one another, each comprising its members for introducing and discharging the material and the drying gas by the adjoining trunnion.
  • De tels broyeurs sont utilisés notamment pour la préparation de charbon pulvérisé assurant l'alimentation de brûleurs de chaudières. Ils sont d'axe horizontal et tournent autour de celui-ci. Ils sont généralement chargés de boulets ou d'autres éléments broyants en matériau dur qui pulvérisent par écrasement et trituration le matériau à broyer. Dans certains cas, avec des matériaux autres que le charbon, le broyage s'effectue par attrition des fragments du matériau à broyer les uns contre les autres.Such grinders are used in particular for the preparation of pulverized coal ensuring the supply of boiler burners. They are of horizontal axis and rotate around it. They are generally loaded with balls or other grinding elements made of hard material which pulverize by crushing and crushing the material to be ground. In some cases, with materials other than coal, the grinding is carried out by attrition of the fragments of the material to be ground against each other.
  • Le matériau à broyer présentant d'habitude un certain taux d'humidité, on introduit dans le broyeur en même temps que le matériau à broyer un gaz chaud, généralement de l'air, qui assure son séchage pendant le broyage, puis le transport pneumatique du matériau pulvérisé.Since the material to be ground usually has a certain moisture content, a hot gas, generally air, is introduced into the grinder at the same time as the material to be ground, which ensures its drying during grinding, then pneumatic transport. sprayed material.
  • Le matériau à broyer et le gaz de séchage et de transport sont généralement introduits dans le broyeur par deux tourillons creux d'extrémité. Le matériau broyé ressort par ces tourillons, que comportent des cloisons et des systèmes de vis de transport du matériau à broyer. A la sortie de ces tourillons, le matériau broyé en suspension dans le gaz de séchage, dont la granulométrie est assez étendue, passe le plus souvent dans une séparateur qui laisse passer les grains fins vers l'utilisation, et recycle les grains grossiers avec le matériau brut pour un nouveau passage dans le broyeur.The material to be ground and the drying and transport gas are generally introduced into the mill by two hollow end pins. The ground material emerges from these pins, which include partitions and screw systems for transporting the material to be ground. At the outlet of these pins, the ground material suspended in the drying gas, the grain size of which is quite wide, most often passes through a separator which lets the fine grains pass to use, and recycles the coarse grains with the raw material for a new passage in the mill.
  • Le document GA-A-2007112 décrit un broyeur divisé en deux sections, alimentées chacune par une trémie différente, et dans lequel les matériaux broyés évacués des sections correspondantes par entraînement dans de l'air chaud de séchage sont réunis dans un séparateur commun pour être envoyés à l'utilisation à un degré de finesse uniforme.Document GA-A-2007112 describes a mill divided into two sections, each fed by a different hopper, and in which the crushed materials removed from the corresponding sections by entrainment in hot drying air are combined in a common separator to be sent for use with a uniform degree of finesse.
  • Or pour certaines applications il est nécessaire de disposer de deux degrés de finesse différents du matériau broyé.However for certain applications it is necessary to have two different degrees of fineness of the ground material.
  • La présente invention a pour but de procurer un broyeur cylindrique rotatif qui permette d'obtenir ces deux degrés de finesse différents.The object of the present invention is to provide a rotary cylindrical grinder which makes it possible to obtain these two different degrees of fineness.
  • Le broyeur selon l'invention est caractérisé en ce que l'évacuation de chacune de ses parties est reliée à un séparateur des grains broyés selon leur finesse, muni d'un conduit de recyclage, et en ce que le séparateur relié à la partie du broyeur assurant la plus grande finesse de broyage comporte un conduit d'évacuation des grains les plus grossiers vers le conduit d'alimentation de la partie du broyeur assurant une finesse de broyage moindre.The mill according to the invention is characterized in that the evacuation of each of its parts is connected to a separator of the ground grains according to their fineness, provided with a recycling conduit, and in that the separator connected to the part of the grinder ensuring the greatest fineness of grinding comprises a duct for evacuating the coarsest grains towards the supply duct of the part of the grinder ensuring a finest grinding fineness.
  • La partie de broyeur destinée à produire le matériau pulvérisé de degré de finesse le plus élevé est avantageusement reliée à une source d'air chaud sous une pression plus élevée que celle de la source d'air alimentant la partie du broyeur destinée à produire le matériau pulvérisé de degré de finesse moindre.The part of the crusher intended to produce the pulverized material of the highest degree of fineness is advantageously connected to a source of hot air under a higher pressure than that of the air source supplying the part of the crusher intended to produce the material sprayed with a lower degree of finesse.
  • Il est décrit ci-après, à titre d'exemple et en référence à la figure unique du dessin annexé, un broyeur à charbon à boulets pour l'alimentation des brûleurs d'une chaudière à partir de deux charbons d'origines différentes, les brûleurs pilotes étant alimentés en charbon finement pulvérisé et les brûleurs de chauffe normale en charbon pulvérisé moins finement et plus riche en cendres.It is described below, by way of example and with reference to the single figure of the accompanying drawing, a coal ball mill for feeding the burners of a boiler from two coals of different origins, the pilot burners being supplied with finely pulverized charcoal and the normal heating burners with pulverized charcoal less finely and richer in ash.
  • Le broyeur rotatif à boulets 1 d'axe horizontal comporte une cloison 2 le séparant en une chambre de broyage gauche G et une chambre de broyage droite D.The rotary ball mill 1 with a horizontal axis comprises a partition 2 separating it into a left grinding chamber G and a right grinding chamber D.
  • De façon symétrique, les tourillons 3 du broyeur sont agencés pour assurer
    • - le support et la rotation du broyeur (cette dernière à l'aide d'un moteur non représenté).
    • - l'alimentation en charbon brut par le conduit 3A, un espace annulaire et une vis 4,
    • - l'entrée de l'air de séchage et de transport du charbon pulvérisé arrivant par le conduit 5, par un conduit central 5A,
    • - la sortie du charbon broyé par l'espace annulaire et le conduit d'évacuation 6.
    Symmetrically, the pins 3 of the crusher are arranged to ensure
    • - the support and the rotation of the crusher (the latter using a motor not shown).
    • - the supply of raw coal through the conduit 3A, an annular space and a screw 4,
    • the entry of the air for drying and transporting the pulverized coal arriving via line 5, through a central pipe 5A,
    • - the outlet of the ground coal through the annular space and the evacuation duct 6.
  • Le séparateur 7 du côté gauche correspond à la production du charbon pulvérisé le plus fin. La détente dans le cône enveloppe 7A du séparateur provoque d'abord la séparation des très gros grains qui sont guidés par la paroi vers le conduit 8 de transfert vers le côté droit du broyeur. Les grains de grosseur moyenne tombent dans le cône intérieur 9 du séparateur et sont dirigés vers le conduit 9A de recyclage vers le côté gauche du broyeur. Enfin les grains fins sont entraînés par l'air de transport vers l'utilisation par le conduit 10.The separator 7 on the left side corresponds to the production of the finest pulverized coal. The expansion in the envelope cone 7A of the separator first causes the separation of the very large grains which are guided by the wall towards the transfer duct 8 towards the right side of the mill. The grains of medium size fall into the inner cone 9 of the separator and are directed towards the recycling conduit 9A towards the left side of the mill. Finally, the fine grains are entrained by the transport air towards use by the conduit 10.
  • Le séparateur 11 du côté droit correspond à la production d'une finesse courante du charbon pulvérisé. Il ne comporte pas d'organe de discrimination entre les grains très gros et les grains moyens, qui sont guidés ensemble par la paroi vers le conduit 12 de recyclage au broyeur, où ils rejoignent le conduit 15 d'alimentation en charbon de la partie droite du broyeur. Le charbon pulvérisé de finesse moyenne est évacué par le conduit 13 vers l'utilisation.The separator 11 on the right side corresponds to the production of a common fineness of the pulverized coal. It does not have a discriminating member between very large grains and medium grains, which are guided together by the wall towards the conduit 12 for recycling to the crusher, where they join the conduit 15 for supplying coal on the right side. of the crusher. The pulverized coal of medium fineness is evacuated via line 13 towards use.
  • Chacune des parties du broyeur possède un fonctionnement indépendant. Chacune d'elles est reliée à une réserve de charbon brut et à un dispositif d'alimentation. Seul le dispositif 14 d'alimentation de la partie droite (à trémie et bande sans fin) a été représenté. Ce dispositif déboche dans le conduit 15 d'alimentation du broyeur, relié aux conduits 8 et 12 déjà cités. Ainsi la totalité du refus du séparateur droit 11 est renvoyée dans le charbon brut alimentant le côté droit du broyeur, avec les grains très gros provenant du refus du séparateur gauche 7. Seuls les grains moyens du séparateur gauche sont renvoyés avec le charbon brut dans la partie gauche du broyeur.Each part of the mill has independent operation. Each of them is connected to a reserve of raw coal and to a supply device. Only the device 14 for feeding the right part (with hopper and endless belt) has been shown. This device opens into the conduit 15 of ali ment of the crusher, connected to the conduits 8 and 12 already mentioned. Thus, all of the refusal from the right separator 11 is returned to the raw coal supplying the right side of the mill, with the very large grains coming from the refusal from the left separator 7. Only the medium grains from the left separator are returned with the raw coal to the left side of the grinder.
  • Il n'est généralement pas possible de renvoyer tous les refus de l'un des séparateurs vers l'autre circuit de broyage, car le taux de recyclage de ces séparateurs est important et de l'ordre de 2.It is generally not possible to send all the rejects from one of the separators to the other grinding circuit, because the recycling rate of these separators is high and of the order of 2.
  • Un avantage supplémentaire de la disposition décrite ci-dessus est qu'elle permet de renvoyer une partie des grains durs et cendreux du charbon d'alimentation du côté gauche du broyeur, destiné à fournir la meilleure qualité de charbon pulvérisé, vers le côté droit, correspondant à une qualité inférieure de charbon pulvérisé. Ceci est explicité par l'exemple suivant. On dispose de deux qualités de charbon différentes, dont les caractéristiques ainsi que le degré de finesse à obtenir pour le produit pulvérisé sont indiquées dans le tableau suivant :
    Figure imgb0001
    An additional advantage of the arrangement described above is that it makes it possible to return a portion of the hard and ashy grains of the feed coal from the left side of the mill, intended to provide the best quality of pulverized coal, to the right side, corresponding to a lower quality of pulverized coal. This is explained by the following example. There are two different grades of charcoal, the characteristics of which and the degree of fineness to be obtained for the pulverized product are indicated in the following table:
    Figure imgb0001
  • On sait que pour une finesse de 90%, il faut une longueur de broyeur double de celle nécessaire pour une finesse de 70%, toutes choses étant égales par ailleurs. Pour des productions de 40 t/h et 80 t/h, il faut donc placer la cloison au milieu du broyeur.We know that for a fineness of 90%, you need a length of grinder double that necessary for a fineness of 70%, all other things being equal. For productions of 40 t / h and 80 t / h, it is therefore necessary to place the partition in the middle of the grinder.
  • On sait par ailleurs qu'entre des charbons de friabilités 40 et 60, l'énergie de broyage est dans le rapport 1, 3/1. La différence de friabilité sera compensée en chargeant le côté gauche du broyeur à 30% de plus que le côté droit.We also know that between coals of friabilities 40 and 60, the grinding energy is in the ratio 1, 3/1. The difference in friability will be compensated by loading the left side of the grinder to 30% more than the right side.
  • Si l'on admet un taux de recyclage de 2, le séparateur gauche refuse 40 t/h que par un agencement mécanique on partage en 30 t/h rejoignant le charbon brut de même origine et 10 t/h rejoignant au côté droit le charbon brut d'une autre origine. Ces 10% sont très concentrés en cendres et inertes, que l'on peut estimer à 30%, ce qui revient à dire que l'on soutire 3 t/h de cendres sur la production de 40 t/h de charbon pulvérisé du côté gauche avec une alimentation en débit de.50 t/h. - 50 t/h de charbon brut à 15% de cendres contiennent 7,5 t/h de cendres et produisent 40 t/h de charbon pulvérisé après soutirage de 10 t/h contenant 3 tonnes de cendres. Il en résulte une teneur en cendres du charbon pulvérisé dans la partie gauche de 11 % et un enrichissement en carbone fixe de 54% à 56,5%.If we accept a recycling rate of 2, the left separator refuses 40 t / h that by a mechanical arrangement we share in 30 t / h joining the raw coal of the same origin and 10 t / h joining the coal on the right side crude from another origin. These 10% are very concentrated in ash and inert, which can be estimated at 30%, which amounts to saying that we extract 3 t / h of ash from the production of 40 t / h of pulverized coal on the side left with a flow supply of 50 t / h. - 50 t / h of raw coal at 15% ash contains 7.5 t / h of ash and produces 40 t / h of pulverized coal after racking 10 t / h containing 3 tonnes of ash. This results in an ash content of the pulverized coal on the left side of 11% and a fixed carbon enrichment of 54% to 56.5%.
  • On va constater maintenant que la qualité du charbon pulvérisé du côté droit n'est pas dégradée pour autant :
    • à 70 t/h broyées contenant 45% de cendres, soit 31,5 t, s'ajoutent 10 t/h en provenance du côté gauche à 30% de cendres, soit 3 t/h:
    • Le côté droit produit ainsi 80 t/h avec 34,5 t/h de cendres, soit 43%, et le carbone fixe passe de 25% à 26%.
    We will now see that the quality of the pulverized coal on the right side is not degraded either:
    • at 70 t / h crushed containing 45% ash, or 31.5 t, add 10 t / h from the left side to 30% ash, or 3 t / h:
    • The right side thus produces 80 t / h with 34.5 t / h of ash, or 43%, and the fixed carbon goes from 25% to 26%.
  • Ce résultat est dû au fait que les refus du côté gauche sont plus riches en carbone que le charbon brut du côté droit.This result is due to the fact that the rejects on the left side are richer in carbon than raw coal on the right side.
  • La séparation des circuits, au conduit 8 près, montre qu'il est possible d'ajuster séparément les débits d'air de transport et de séchage, leur température et leur pression. La pression doit toutefois être dans le côté gauche, supérieure ou égale à celle du côté droit, afin que le courant d'air qui va s'établir dans le conduit 8 favorise l'écoulement des refus de gauche vers la droite.The separation of the circuits, to the nearest duct 8, shows that it is possible to separately adjust the flow rates of transport and drying air, their temperature and their pressure. The pressure must however be in the left side, greater than or equal to that on the right side, so that the air current which will be established in the duct 8 promotes the flow of the refusals from left to right.
  • Par ailleurs, la partie du broyeur destinée à produire le matériau de granulométrie la plus grossière peut ne pas comporter de boulets ou autres éléments broyants, celle destinée à produire le matériau de granulométrie le plus fixe comportant par contre ces boulets ou éléments broyants. Les séparateurs peuvent ne pas être des séparateurs par gravité, mais d'un genre différent, par exemple à crible.Furthermore, the part of the crusher intended to produce the coarsest particle size material may not include balls or other grinding elements, that intended to produce the most fixed particle size material, on the other hand comprising these balls or grinding elements. The separators may not be gravity separators, but of a different kind, for example with a screen.
  • Bien que le broyeur selon l'invention convienne plus particulièrement pour le broyage de charbon ou d'un combustible fossile solide, il s'applique aussi au broyage d'autres matériaux, notamment de minerais.Although the crusher according to the invention is more particularly suitable for grinding coal or a solid fossil fuel, it also applies to the grinding of other materials, in particular ores.

Claims (2)

1. A horizontal axis cylindrical rotary pulverizer (1) for preparing pulverized material having two different degrees of fineness, said pulverizer including members in its stub axles (3) for inserting material and a drying gas and for removing pulverized material in the drying gas, said pulverizer being subdivided by a transverse partition (2) into two portions (G, D) which are isolated from each other, each portion including its own members for inserting (4, 5A) and removing (6) material and drying gas via the respec- five adjacent stub axle, characterized in that the outlet from each of said portions is connected to a separator (7, 11) for separating crushed grains according to their fineness, said separator being provided with a recycling duct (9A, 12), and that the separator (7) connected to the portion (G) of the pulverizer which yields the finer grains is provided with a duct (8) for conveying the larger grains to the feed duct (15) of the portion (D) of the pulverizer for yielding less finely pulverized material.
2. A pulverizer according to claim 1, characterized in that the portion of the pulverizer intended for producing pulverized material with a higher degree of fineness is connected to a source of hot air at a higher pressure than the source of hot air which feeds the portion of the pulverizer for producing pulverized material at a lower degree of fineness.
EP86117104A 1985-12-11 1986-12-09 Rotating drum mill for the preparation of a pulverulent material with two different qualities Expired - Lifetime EP0234017B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8518328A FR2591127B1 (en) 1985-12-11 1985-12-11 Rotary cylindrical crusher for the preparation of a powdery material in two different qualities.
FR8518328 1985-12-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT86117104T AT49515T (en) 1985-12-11 1986-12-09 Turntable mill for the production of a powder-shaped material in two different qualities.

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EP0234017A1 EP0234017A1 (en) 1987-09-02
EP0234017B1 true EP0234017B1 (en) 1990-01-17

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JP (1) JPH0119940B2 (en)
AT (1) AT49515T (en)
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EP0471060B1 (en) * 1990-03-06 1993-06-09 STEIN INDUSTRIE Société Anonyme dite: Method and system for crushing and drying a solid fuel
DE4124416A1 (en) * 1991-07-23 1993-01-28 Krupp Polysius Ag DEVICE AND METHOD FOR CRUSHING GROUND DIFFERENT GRAIN
FR2745731B1 (en) * 1996-03-08 1998-04-17 Gec Alsthom Stein Ind BALL MILL
FR2793168B1 (en) * 1999-05-07 2001-06-22 Alstom Ball mill
CN102247912A (en) * 2011-01-10 2011-11-23 朱海良 Automatic discharging system of bowl mill unit
JP6355865B1 (en) * 2015-06-01 2018-07-11 エフ・エル・スミス・エー・エス Vertical roller mill
CN109937718B (en) * 2019-03-28 2020-10-23 潍坊希普生物科技有限公司 High-efficient type straw rubbing crusher with stoving function

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FR1257591A (en) * 1960-05-27 1961-03-31 Nikex Nehezipari Kulkere Heavy-duty circulating crusher or mill with separate compartments
CA1112626A (en) * 1977-10-03 1981-11-17 Foster Wheeler Energy Corporation Pulverizer arrangement
DE2928939A1 (en) * 1979-07-18 1981-02-12 Kloeckner Humboldt Deutz Ag Tube mill with two grinding chambers - has chambers completely separated by partition for simultaneous grinding of two different materials

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FR2591127B1 (en) 1989-10-06
FR2591127A1 (en) 1987-06-12
JPH0119940B2 (en) 1989-04-13
DE3668272D1 (en) 1990-02-22
EP0234017A1 (en) 1987-09-02
IN169769B (en) 1991-12-21
JPS62191051A (en) 1987-08-21
AT49515T (en) 1990-02-15

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