EP0196486B1 - Charging apparatus for a shaft furnace - Google Patents

Charging apparatus for a shaft furnace Download PDF

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Publication number
EP0196486B1
EP0196486B1 EP86102912A EP86102912A EP0196486B1 EP 0196486 B1 EP0196486 B1 EP 0196486B1 EP 86102912 A EP86102912 A EP 86102912A EP 86102912 A EP86102912 A EP 86102912A EP 0196486 B1 EP0196486 B1 EP 0196486B1
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EP
European Patent Office
Prior art keywords
hopper
locks
installation according
vertical axis
chamber
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
Application number
EP86102912A
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German (de)
French (fr)
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EP0196486A1 (en
Inventor
René Mahr
Emile Lonardi
Gilbert Bernard
Marc Solvi
Pierre Mailliet
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Paul Wurth SA
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Paul Wurth SA
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Priority to AT86102912T priority Critical patent/ATE37200T1/en
Publication of EP0196486A1 publication Critical patent/EP0196486A1/en
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Publication of EP0196486B1 publication Critical patent/EP0196486B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/20—Arrangements of devices for charging
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden

Definitions

  • the present invention relates to a loading installation of a shaft furnace comprising a distribution device with a rotary or oscillating chute, a storage hopper mounted on the vertical axis of the furnace and whose flow orifice towards the chute is controlled by a metering member designed so as to enlarge and reduce the flow section symmetrically around said vertical axis.
  • the object of the present invention is to provide a new installation for loading a shaft furnace of the kind described in the preamble, which includes means for effectively reducing segregation.
  • the loading installation according to the present invention is characterized in that the storage hopper and the metering member are movable in rotation about the vertical axis and are mounted inside a sealed chamber. which is surmounted by at least two airlocks each provided with upper and lower sealing valves and in that the hopper and the bottom of each of the airlocks are in the form of tapered funnels whose conical wall makes an angle less than or equal to 30 ° with the vertical axis of the oven.
  • Said chamber is preferably surmounted by three airlocks in order to allow a reduction in the capacity of each of them and also to ensure better continuity of loading, i.e. to minimize downtime.
  • the maximum diameter of each airlock is preferably less than three meters.
  • the storage hopper is preferably carried by support and guide rollers which can evolve on a circular rail secured to the wall of the sealed chamber and undergoes the action of a drive mechanism which can rotate it around the vertical axis of the oven.
  • Anti-segregation boxes are preferably provided both in the airlocks and in the hopper in order to ensure better filling and, above all, to guarantee a more uniform distribution of the particles of different particle size.
  • the invention therefore provides several effective measures making it possible to reduce segregation or its effects, namely the small diameter of the airlocks and of the hopper, as well as their tapered shape, the rotation of the hopper about the vertical axis, as well as anti-segregation boxes.
  • FIGS 1 to 3 show, in principle, the same loading installation which is carried by a frame 10 itself supported by the head of a shaft furnace 12 in which is mounted a rotating or oscillating chute 14 for distributing the material loading.
  • a storage hopper 16 is mounted symmetrically around the vertical axis 0 of the oven, above a vertical feed channel 18 opening onto the chute 14. According to one of the features of the invention, this hopper 16 has a shape of a tapered funnel whose conical wall makes an angle less than or equal to 30 ° with the axis 0 and whose maximum diameter does not exceed 4 to 5 meters at its upper part.
  • the storage hopper 16 is covered by a sealed chamber 20 carried by the frame 10. According to another feature of the invention, the hopper 16 can rotate inside the chamber 20 around the vertical axis 0. At this Indeed, the hopper 16 is provided with several, eg four rollers 22 which evolve on a circular rail 26 and on an inner shoulder of the chamber 20. Other rollers 24 with vertical axis of rotation ensure the horizontal maintenance while moving on an inner edge of the rail 26.
  • the hopper 16 is extended downwards by a drainage tube 28 provided with a metering valve 30 for regulating the flow of the loading material from the hopper 16 on the chute 14.
  • the valve 30 consists of two registers , preferably in the shape of a cap, which open and close in synchronism and in opposite directions with respect to the axis so as to define a symmetrical flow opening around the axis 0.
  • the operation of these registers can be produced, in a manner known per se, by an annular rail 32 which can be mounted and lowered from the outside and in which evolve guide rollers mounted on the arms of each of the registers, this to allow the valve to be maneuvered during the rotations of the hopper 16 by vertical displacement of the rail 32.
  • the bottom of the latter is also funneled to form above the tube 28 a constriction 34 as narrow as possible between the wall of the chamber 20 and that of the hopper 16. It is possible to provide this throttle 34 with a friction flap to avoid the passage of gases as much as possible.
  • inert gas can be sent into the chamber 20 under pressure to create, through the throttle 34, a downward flow in the opposite direction which prevents the rise of the gases.
  • the chamber 20 is surmounted, in the example shown, by a triangular arrangement of three individual airlocks 36, 38, 40 (the airlocks 40 not being visible in the figure) individually supported by the frame. Communication between each of the airlocks 36, 38 and 40 and the hopper 16 is achieved respectively through valve cages 42, 44, 46 (see also Fig. 1a) which each close a metering valve 48 and a sealing valve 50.
  • the metering valve 48 is also preferably made up of two spherical registers, pivoting by symmetrical action around the vertical axis of each airlock. This valve 48 as well as the lower tubing of the airlocks with which it cooperates are preferably as wide as possible in order to ensure rapid flow of the airlocks towards the hopper 16.
  • Each of the airlocks 36, 38 and 40 must also be provided with an upper sealing valve 52 to allow the pressurization of the airlocks during the flow of the material towards the hopper as well as their ventilation during loading.
  • a waterproof compensator 54 Between the chamber 20 and the head of the oven 12 is a waterproof compensator 54.
  • waterproof compensators 56 are located between the chamber 20 and each of the valve cages 42, 44, 46.
  • These compensators 54 and 56 make it possible to individually weigh the chamber 20 with the hopper 16 as well as each of the airlocks 36, 38 and 40.
  • the weighing is carried out, in a manner known per se, by constraint cells represented diagrammatically at 58 and 60 and carrying the chamber 20 respectively, thus as each of the airlocks 36, 38 and 40. Thanks to these individual weighings, it is possible to determine the content of the hopper 16 as well as that of each of the airlocks 36, 38 and 40 in order to automatically control the opening of the valves for filling and emptying of these tanks.
  • the loading material of the furnace is brought by a conveyor belt 62 which pours it, in the embodiment of FIG. 1, into a waiting hopper 64 whose flow is controlled by the valve 66. Below this hopper 64 there is a rotary chute 68 which successively ensures the connection between the hopper 64 and each of the airlocks 36, 38 and 40.
  • the conveyor belt 62 also pours the loading material into a holding hopper 70.
  • the chute of FIG. 1 is replaced by three fixed pipes 72 connecting the hopper 70 to each of the airlocks 36, 38 and 40.
  • Each of its pipes 72 is associated in the example shown with a valve 74 for closing and opening.
  • the conveyor belt 62 also pours the loading material into a holding hopper 76 whose flow opening is controlled by a valve 78. From the hopper 76 the loading material falls on a second conveyor belt 80 which is mounted in a frame 82 capable of pivoting about an axis parallel to the central vertical axis 0.
  • This second conveyor belt 80 is, moreover, retractable and, for this purpose, the front deflection roller 84 can slide in the longitudinal direction under the action of a jack 86, compensation for the length of the conveyor belt being ensured by a free sliding roller 88. In this way , the conveyor belt 80 can pour the loading material into each of the airlocks 36, 38 and 40.
  • the main objective of the invention is to eliminate segregation or, at least, to mitigate its effects.
  • One of the factors contributing to the achievement of this objective is the replacement of the single large capacity hopper of document AP-A-0 062 770 with four small diameter enclosures.
  • the capacity of each of the airlocks 36, 38 and 40 as well as that of the hopper 16 is only 20 m 3 against 80 m 3 for the aforementioned document.
  • each of the airlocks and the hopper 16 have a very tapered shape, the angle of their conical wall with the vertical axis not exceeding 30 °.
  • the ideal would be, by the way, downright tubular enclosures whose section is equal to the section of the flow tubing. However, this is difficult to achieve because of the resulting increase in height. It is therefore necessary to find a compromise between the available height and the section of the airlocks and the storage hopper.
  • an anti-segregation box 90 known per se has been mounted. Such a box reduces segregation during filling and promotes a more uniform flow during emptying.
  • a central anti-segregation box 94 and, in addition, an upper annular box 92. These boxes reduce the rolling of particles and promote the projection of fines against the wall whereas, without the presence of boxes, these tend to accumulate along the 0 axis.
  • the rotation of the hopper 16 also attenuates segregation to a certain extent. However, the main purpose of this rotation is to ensure correct filling of the hopper 16. This rotation, which takes place at a speed of 6 to 8 revolutions per minute, allows the contents of an airlock to be deposited in the hopper 16 along the loading line 96 with only a slight dip in the central region.
  • the starting data are as follows:
  • the loading diagram in Figure 4 is actually an overlay of 4 graphics on the same time base.
  • the graph shows the successive phases lasting 265 seconds each of the alternative loads of coke and ore.
  • the graph It represents the emptying of the three airlocks which were no longer represented by their numerical references 36, 38 and 40, but, for the sake of convenience by the letters A, B, C.
  • the graph III represents the loading of the three airlock A, B and C, while graph IV represents the supply of coke and ore by means of the conveyor belt 62.
  • the first 13 seconds are reserved for opening the metering valves 30 to a position corresponding to a flow rate of 0.335 m 3 per second of loading material.
  • the airlock and metering valves of the airlock A are open and during these 13 seconds the content of this airlock A is completely transferred into the hopper 16 (see graph 11).
  • the filling of airlock B ends and the filling of airlock C begins (see graph III) while the supply of a continuous layer of 80 m 3 by the conveyor belt continues (see graph IV).
  • the flow of coke begins on the distribution chute at a rate of 0.335 m 3 per second.
  • the airlocks A which is now emptied of its contents can be prepared for a next filling.
  • its metering valve and its lower sealing valve are closed and ventilation is carried out.
  • the content of the airlock B is also transferred in the hopper 16 in 13 seconds while the flow thereof continues.
  • the filling of the airlock C which also continues comes to an end and as soon as this one is filled, the airlock A whose upper sealing valve has just been opened now receives the last twenty m 3 of coke from the conveyor belt .
  • This ore loading cycle has in fact already started at a higher level, by the ascent by the conveyor 62 of a sheet of 80 m 3 of ore and the filling of the airlocks B and C.
  • the ore content is transferred for 13 seconds from the airlock B to the hopper 16 and at the same time the opening of the metering valves is adjusted to a position d flow corresponding to a flow of 0.335 m 3 per second. While the airlock B is emptied, the operation of filling the airlock C ends and the filling of the airlock A with ore begins. After 13 seconds of the second cycle, loading of ore begins. This loading is analogous to loading with coke, that is to say that the contents of the airlocks BC, A and B are successively emptied each time the weighing of the hopper 16 provides the demand.
  • FIG. 4 reveals another advantage of the device according to the invention compared to the known device described in the aforementioned European patent application. Indeed, as shown in graph 1, loading is almost continuous, the only interruption being the stop of 26 seconds between each cycle for the operation of the hopper valve. In any event, it is difficult to carry out a continuous loading at 100% since after the deposition of each layer it is necessary to cut the loading to straighten the chute and start a new layer at the periphery.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Blast Furnaces (AREA)
  • Heat Treatment Of Articles (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

An apparatus for distributing charge material to a shaft furnace is presented which effectively reduces the segregation of the particles in a storage housing positioned above the shaft furnace. In the present invention, the storage hopper and the distribution device are movable about the vertical axis of the shaft furnace and are mounted inside a sealed chamber. Above the chamber are arranged at least two locks which are each provided with upper and lower sealing flaps. Preferably, the storage hopper and the bottom of each of the locks are in the configuration of tapered funnels, the conical wall of which forms an angle of less than or equal to about 30 DEG with respect to the vertical axis of the furnace. The storage hopper is preferably supported by support and guide rollers which move on a circular rail integral with the wall of the sealed chamber and is subjected to the action of a drive mechanism for rotation about the vertical axis of the furnace. Anti-segregation boxes are preferably provided both in the locks and in the hopper, to ensure better filling and guarantee a more uniform distribution of the particles of differing granulometry.

Description

La présente invention concerne une installation de chargement d'un four à cuve comprenant un dispositif de distribution à goulotte rotative ou oscillante, une trémie de stockage montée sur l'axe verticale du four et dont l'orifice d'écoulement vers la goulotte est contrôlé par un organe de dosage conçu de façon à agrandir et réduire la section d'écoulement symétriquement autour dudit axe vertical.The present invention relates to a loading installation of a shaft furnace comprising a distribution device with a rotary or oscillating chute, a storage hopper mounted on the vertical axis of the furnace and whose flow orifice towards the chute is controlled by a metering member designed so as to enlarge and reduce the flow section symmetrically around said vertical axis.

Une installation de ce genre est prosposée dans le document EP-A-0 062 770. Les installations construites récemment conformément à cette demande de brevet ont démontré que ce genre d'installation a permis de résoudre définitivement le problème posé par les chutes obliques de la matière de chargement dans les installations connues avec deux trémies de stockage juxtaposées opérant en alternance.An installation of this kind is provided for in document EP-A-0 062 770. The installations recently constructed in accordance with this patent application have demonstrated that this type of installation has made it possible to definitively solve the problem posed by the oblique falls of the loading material in known installations with two juxtaposed storage hoppers operating alternately.

Si cette nouvelle installation a permis de résoudre un problème connu depuis l'existence des installations de chargement à goulotte rotative, elle souffre néanmois de l'existence d'un autre problème, constaté depuis un certain temps et dû à la granulométrie de la matière de chargement. En effet, la matière de chargement, qu'il s'agisse des particules de minerai de fer ou de particules de coke, possède une granulométrie variable et non uniforme. Or, il a été constaté qu'il se produit, lors du remplissage des sas et des trémies de stockage, une ségrégation de la matière de chargement, justement selon cette granulométrie. En outre, ce phénomène de ségrégation est intensifié par l'écoulemet. Cette ségrégation résulte de plusieurs facteurs dont les effets se cumulent.If this new installation made it possible to solve a problem known since the existence of loading installations with rotary chute, it nevertheless suffers from the existence of another problem, noted for some time and due to the granulometry of the material of loading. In fact, the loading material, whether it be iron ore particles or coke particles, has a variable and non-uniform particle size. However, it has been observed that, when filling the airlocks and the storage hoppers, segregation of the loading material occurs, precisely according to this particle size. In addition, this phenomenon of segregation is intensified by the flow. This segregation results from several factors, the effects of which are cumulative.

L'une des raisons de cette ségrégation est que, lors du remplissage d'une enceinte, il se forme un cône de déversement naturel autour du point de chute. Les particules les plus grosses et plus lourdes ont tendance à dégringoler le long des pentes de ce cône, sous l'influence de leur poids vers les régions périphériques de l'enceinte. Par contre, les particules les plus petites, appelées «fines» ont tendance à rester dans la région centrale du cône de déversement.One of the reasons for this segregation is that, when filling an enclosure, a natural discharge cone is formed around the drop point. The larger and heavier particles tend to tumble along the slopes of this cone, under the influence of their weight towards the peripheral regions of the enclosure. On the other hand, the smallest particles, called "fines" tend to remain in the central region of the discharge cone.

Si, lors du remplissage, il se forme un cône naturel de déversement, par contre, lors de l'écoulement, il se produit le phénomène inverse, c.à.d., que les particules dans la région centrale ont tendance à s'écouler d'abord et s'enfoncer davantage pour former un niveau d'écoulement en forme de «V».If, during filling, a natural discharge cone is formed, on the other hand, during the flow, the reverse phenomenon occurs, i.e., that the particles in the central region tend to s' flow first and sink further to form a “V” shaped level of flow.

Outre ce phénomène de remplissage et d'écoulement, les fines ont tendance à s'accumuler en plus grosses proportions dans le fond d'une enceinte, étant donné que, à cause de leur taille, elle peuvent glisser entre les particules plus volumineuses. Une troisième raison est que lors de la chute de la matière de chargement dans une enceinte, surtout au début de la phase de remplissage, un certain nombre de plus grosses particules se brisent en plusieurs parties pour former de cette manière, des fines.In addition to this filling and flow phenomenon, fines tend to accumulate in larger proportions at the bottom of an enclosure, given that, because of their size, they can slide between the larger particles. A third reason is that when the loading material falls into an enclosure, especially at the start of the filling phase, a certain number of larger particles break up in several parts to form in this way fines.

L'effet cumulatif de tous ces facteurs est que, lors de la phase initiale de l'écoulement de la matière de chargement de l'enceinte, la proportion de fines est beaucoup plus grande que vers la fin de l'écoulement où la proportion des particules plus volumineuses devient plus grande. Il en résulte que, si l'on utilise le contenu d'une enceinte pour déposer une couche sur toute la surface supérieure de chargement, et si, à cet effet, on décrit, au moyen de la goulotte rotative, une spirale ou des cercles concentriques de l'extérieur vers la région centrale, la concentration en fines est beaucoup plus élevée dans les régions périphériques que dans la région centrale autour de l'axe vertical du four ce qui le plus souvent ne correspond pas au voeu des sidérurgistes.The cumulative effect of all these factors is that, during the initial phase of the flow of the loading material from the enclosure, the proportion of fines is much greater than towards the end of the flow where the proportion of larger particles becomes larger. It follows that, if the contents of an enclosure are used to deposit a layer over the entire upper loading surface, and if, for this purpose, a spiral or circles are described by means of the rotary chute concentric from the outside to the central region, the concentration of fines is much higher in the peripheral regions than in the central region around the vertical axis of the furnace, which most often does not correspond to the wishes of the steelmakers.

Si les conséquences de ce phénomène de ségrégation restent dans des limites tolérables dans les installations à deux trémies juxtaposées opérant en alternace, elle se manifestent davantage dans les installations à haute capacité du genre décrit ci-dessus avec une trémie centrale à grosse capacité et une trémie supplémentaire au-dessus de celle-ci. Or, compte tenu du soucis de ne pas vouloir augmenter la hauteur de façon exagérée, l'augmentation de capacité doit forcément passer par l'augmentation du diamètre de la trémie. Il est évident qu'une augmentation du diamètre intensifie les effets de la ségrégation de sorte que les conséquences de celle-ci deviennent de plus en plus néfastes au fur et à mesure que le volume du four sur lequel est montée l'installation augmente.If the consequences of this segregation phenomenon remain within tolerable limits in installations with two juxtaposed hoppers operating alternately, it is more manifest in high-capacity installations of the kind described above with a large-capacity central hopper and a hopper extra on top of it. However, given the concern of not wanting to increase the height excessively, the increase in capacity must necessarily go through the increase in the diameter of the hopper. It is obvious that an increase in diameter intensifies the effects of segregation so that the consequences of this become increasingly harmful as the volume of the oven on which the installation is mounted increases.

Le but de la présente invention est de prévoir une nouvelle installation de chargement d'un four à cuve du genre décrit dans la préambule, qui comporte des moyens pour réduire efficacement la ségrégation.The object of the present invention is to provide a new installation for loading a shaft furnace of the kind described in the preamble, which includes means for effectively reducing segregation.

Pour atteindre cet objectif, l'installation de chargement selon la présente invention est caractérisée en que la trémie de stockage et l'organe de dosage sont mobiles en rotation autour de l'axe vertical et sont montés à l'intérieur d'une chambre étanche qui est surmontée d'au moins deux sas pourvus chacun de clapets d'étanchéité supérieurs et inférieurs et en ce que la trémie et le fond de chacun des sas sont en forme d'entonnoirs effilés dont la paroi conique fait un angle inférieur ou égal à 30° avec l'axe vertical du four.To achieve this objective, the loading installation according to the present invention is characterized in that the storage hopper and the metering member are movable in rotation about the vertical axis and are mounted inside a sealed chamber. which is surmounted by at least two airlocks each provided with upper and lower sealing valves and in that the hopper and the bottom of each of the airlocks are in the form of tapered funnels whose conical wall makes an angle less than or equal to 30 ° with the vertical axis of the oven.

Ladite chambre est, de préférence, surmontée de trois sas afin de permettre une réduction de la capacité de chacun de ceux-ci et aussi pour assurer une meilleure continuité du chargement, c.à.d. pour réduire autant que possible les temps morts.Said chamber is preferably surmounted by three airlocks in order to allow a reduction in the capacity of each of them and also to ensure better continuity of loading, i.e. to minimize downtime.

Le diamètre maximal de chacun des sas est, de préférence, inférieur à trois mètres.The maximum diameter of each airlock is preferably less than three meters.

La trémie de stockage est, de préférence, portée par des galets de support et de guidage pouvant évoluer sur un rail circulaire solidaire de la paroi de la chambre étanche et subit l'action d'un mécanisme d'entraînement pouvant la faire tourner autour de l'axe vertical du four.The storage hopper is preferably carried by support and guide rollers which can evolve on a circular rail secured to the wall of the sealed chamber and undergoes the action of a drive mechanism which can rotate it around the vertical axis of the oven.

Des caissons anti-ségrégation sont, de préférence, prévus aussi bien dans les sas que dans la trémie afin d'assurer un meilleur remplissage et, surtout, de garantir une répartition plus uniforme des particules de granulométrie différente.Anti-segregation boxes are preferably provided both in the airlocks and in the hopper in order to ensure better filling and, above all, to guarantee a more uniform distribution of the particles of different particle size.

L'invention fournit, par conséquent, plusieurs mesures efficaces permettant de réduire la ségrégation ou ses effets, à savoir le faible diamètre des sas et de la trémie, ainsi que leur forme effilée, la rotation de la trémie autour de l'axe vertical, ainsi que les caissons anti-ségrégation.The invention therefore provides several effective measures making it possible to reduce segregation or its effects, namely the small diameter of the airlocks and of the hopper, as well as their tapered shape, the rotation of the hopper about the vertical axis, as well as anti-segregation boxes.

D'autres particularités et caractéristiques ressortiront de la description détaillée de plusieurs modes de réalisation présentés ci-dessous, à titre d'illustration, en référence aux dessins annexés dans lesquels:

  • Les figures 1 à 3 montrent schématiquement des vues latérales, partiellement en coupe de trois modes de réalisation qui se différencient par les dispositifs de remplissage des sas.
  • La figure 1 a montre une coupe horizontale suivant le plan de coupe a-a de la figure 1 et
  • la figure 4 montre un schéma chronologique des différentes opérations de chargement.
Other peculiarities and characteristics emerged ront detailed description of several embodiments presented below, by way of illustration, with reference to the accompanying drawings in which:
  • Figures 1 to 3 schematically show side views, partially in section of three embodiments which are differentiated by the airlock filling devices.
  • Figure 1a shows a horizontal section along the cutting plane aa of Figure 1 and
  • Figure 4 shows a chronological diagram of the different loading operations.

Les figurs 1 à 3 montrent, en principe, la même installation de chargement qui est portée par une charpente 10 elle-même supportée par la tête d'un four à cuve 12 dans laquelle est montée une goulotte 14 rotative ou oscillante pour distribuer la matière de chargement.Figures 1 to 3 show, in principle, the same loading installation which is carried by a frame 10 itself supported by the head of a shaft furnace 12 in which is mounted a rotating or oscillating chute 14 for distributing the material loading.

Une trémie de stockage 16 est montée symétriquement autour de l'axe vertical 0 du four, au-dessus d'un canal d'alimentation vertical 18 débouchant sur la goulotte 14. Selon l'une des particularités de l'invention, cette trémie 16 a une forme d'entonnoir effilé dont la paroi conique fait un angle inférieur ou égal à 30° avec l'axe 0 et dont le diamètre maximal ne dépasse pas 4 à 5 mètres à sa partie supérieure.A storage hopper 16 is mounted symmetrically around the vertical axis 0 of the oven, above a vertical feed channel 18 opening onto the chute 14. According to one of the features of the invention, this hopper 16 has a shape of a tapered funnel whose conical wall makes an angle less than or equal to 30 ° with the axis 0 and whose maximum diameter does not exceed 4 to 5 meters at its upper part.

La trémie de stockage 16 est capotée par une chambre étanche 20 portée par la charpente 10. Selon une autre particularité de l'invention, la trémie 16 peut tourner à l'intérieur de la chambre 20 autour de l'axe vertical 0. A cet effet, la trémie 16 est pourvue de plusieurs, p.ex. quatre galets de roulement 22 qui évoluent sur un rail circulaire 26 et sur un épaulement intérieur de la chambre 20. D'autres galets 24 à axe de rotation vertical assurent le maintien horizontal en évoluant sur un rebord intérieur du rail 26.The storage hopper 16 is covered by a sealed chamber 20 carried by the frame 10. According to another feature of the invention, the hopper 16 can rotate inside the chamber 20 around the vertical axis 0. At this Indeed, the hopper 16 is provided with several, eg four rollers 22 which evolve on a circular rail 26 and on an inner shoulder of the chamber 20. Other rollers 24 with vertical axis of rotation ensure the horizontal maintenance while moving on an inner edge of the rail 26.

La trémie 16 se prolonge vers le bas par une tubulure d'écoulement 28 pourvue d'un clapet de dosage 30 pour régler l'écoulement de la matière de chargement de la trémie 16 sur la goulotte 14. Le clapet 30 est constitué par deux registres, de préférence en forme de calotte qui s'ouvrent et se ferment en synchronisme et en sens opposé par rapport à l'axe de manière à définir une ouverture d'écoulement symétrique autour de l'axe 0. La manoeuvre de ces registres peut être réalisée, de façon connue en soi, par un rail annulaire 32 qui peut être monté et descendu depuis l'extérieur et dans lequel évoluent des galets de guidage montés sur des bras de chacun des registres, ceci pour permettre la manoeuvre du clapet pendant la rotations de la trémie 16 par déplacement vertical du rail 32.The hopper 16 is extended downwards by a drainage tube 28 provided with a metering valve 30 for regulating the flow of the loading material from the hopper 16 on the chute 14. The valve 30 consists of two registers , preferably in the shape of a cap, which open and close in synchronism and in opposite directions with respect to the axis so as to define a symmetrical flow opening around the axis 0. The operation of these registers can be produced, in a manner known per se, by an annular rail 32 which can be mounted and lowered from the outside and in which evolve guide rollers mounted on the arms of each of the registers, this to allow the valve to be maneuvered during the rotations of the hopper 16 by vertical displacement of the rail 32.

Pour éviter une pénétration exagérée de gaz chauds dans la chambre 20, le fond de celle-ci est également en entonnoir pour former au-dessus de la tubulure 28 un étranglement 34 aussi étroit que possible entre la paroi de la chambre 20 et celle de la trémie 16. Il est possible de munir cet étranglement 34 d'une bavette à frottement pour éviter le plus possible le passage des gaz. Comme solution alternative on peut envoyer dans la chambre 20 un gaz inerte sous pression pour créer à travers l'étranglement 34 un courant descendant à contre-sens qui empêche la montée des gaz.To avoid an excessive penetration of hot gases into the chamber 20, the bottom of the latter is also funneled to form above the tube 28 a constriction 34 as narrow as possible between the wall of the chamber 20 and that of the hopper 16. It is possible to provide this throttle 34 with a friction flap to avoid the passage of gases as much as possible. As an alternative solution, inert gas can be sent into the chamber 20 under pressure to create, through the throttle 34, a downward flow in the opposite direction which prevents the rise of the gases.

La chambre 20 est surmontée, dans l'exemple représenté, d'un arrangement triangulaire de trois sas individuels 36, 38, 40 (les sas 40 n'étant pas visible sur la figure) supportés individuellement par la charpente. La communication entre chacun des sas 36, 38 et 40 et la trémie 16 est réalisée respectivement à travers des cages à clapets 42, 44, 46 (voir également Fig. 1a) qui referment chacune un clapet de dosage 48 et un clapet d'étanchéité 50. Le clapet de dosage 48 est également constitué, de préférence, par deux registres sphériques, pivotant par action symétrique autour de l'axe vertical de chaque sas. Ce clapet 48 ainsi que la tubulure inférieure des sas avec laquelle il coopère sont de préférence aussi larges que possible afin d'assurer un écoulement rapide des sas vers la trémie 16.The chamber 20 is surmounted, in the example shown, by a triangular arrangement of three individual airlocks 36, 38, 40 (the airlocks 40 not being visible in the figure) individually supported by the frame. Communication between each of the airlocks 36, 38 and 40 and the hopper 16 is achieved respectively through valve cages 42, 44, 46 (see also Fig. 1a) which each close a metering valve 48 and a sealing valve 50. The metering valve 48 is also preferably made up of two spherical registers, pivoting by symmetrical action around the vertical axis of each airlock. This valve 48 as well as the lower tubing of the airlocks with which it cooperates are preferably as wide as possible in order to ensure rapid flow of the airlocks towards the hopper 16.

Chacun des sas 36, 38 et 40 doit également être pourvu d'un clapet d'étanchéité supérieur 52 pour permettre le pressurisation de sas pendant l'écoulement de la matière vers la trémie ainsi que leur aération pendant le chargement. Entre la chambre 20 et la tête du four 12 se trouve un compensateur étanche 54. De même, des compensateurs étanches 56, se trouvent entre la chambre 20 et chacune des cages à clapets 42, 44, 46. Ces compensateurs 54 et 56 permettent de peser individuellement la chambre 20 avec la trémie 16 ainsi que chacun des sas 36, 38 et 40. La pesée est effectuée, de façon connue en soi, par des cellules de contrainte représentées schématiquement en 58 et 60 et portant respectivement la chambre 20, ainsi que chacun des sas 36, 38 et 40. Grâce à ces pesées individuelles on peut déterminer le contenu de la trémie 16 ainsi que celui de chacun des sas 36, 38 et 40 afin de commander automatiquement l'ouverture des clapets pour le remplissage et la vidange de ces réservoirs.Each of the airlocks 36, 38 and 40 must also be provided with an upper sealing valve 52 to allow the pressurization of the airlocks during the flow of the material towards the hopper as well as their ventilation during loading. Between the chamber 20 and the head of the oven 12 is a waterproof compensator 54. Similarly, waterproof compensators 56 are located between the chamber 20 and each of the valve cages 42, 44, 46. These compensators 54 and 56 make it possible to individually weigh the chamber 20 with the hopper 16 as well as each of the airlocks 36, 38 and 40. The weighing is carried out, in a manner known per se, by constraint cells represented diagrammatically at 58 and 60 and carrying the chamber 20 respectively, thus as each of the airlocks 36, 38 and 40. Thanks to these individual weighings, it is possible to determine the content of the hopper 16 as well as that of each of the airlocks 36, 38 and 40 in order to automatically control the opening of the valves for filling and emptying of these tanks.

La matière de chargement du four est amenée par une bande transporteuse 62 qui la déverse, dans le mode de réalisation de la figure 1, dans une trémie d'attente 64 dont l'écoulement est contrôlé par le clapet 66. En-dessous de cette trémie 64 se trouve une goulotte rotative 68 qui assure successivement la liaison entre la trémie 64 et chacun des sas 36, 38 et 40.The loading material of the furnace is brought by a conveyor belt 62 which pours it, in the embodiment of FIG. 1, into a waiting hopper 64 whose flow is controlled by the valve 66. Below this hopper 64 there is a rotary chute 68 which successively ensures the connection between the hopper 64 and each of the airlocks 36, 38 and 40.

Dans le mode de réalisation selon la figure 2, la bande transporteuse 62 déverse également la matière de chargement dans une trémie d'attente 70. Dans ce mode de réalisation, la goulotte de la figure 1 est remplacée par trois tubulures fixes 72 reliant la trémie 70 à chacun des sas 36, 38 et 40. Chacune de ses tubulures 72 est associée dans l'exemple représenté a un clapet 74 de fermeture et d'ouverture. Toutefois, au lieu de prévoir trois clapets il est possible de prévoir un seul clapet à l'intersection des tubulures 72 et de la trémie 70. Cette disposition permet, en outre, une vidange complète des tubulures 72.In the embodiment according to FIG. 2, the conveyor belt 62 also pours the loading material into a holding hopper 70. In this embodiment, the chute of FIG. 1 is replaced by three fixed pipes 72 connecting the hopper 70 to each of the airlocks 36, 38 and 40. Each of its pipes 72 is associated in the example shown with a valve 74 for closing and opening. However, instead of providing three valves, it is possible to provide a single valve at the intersection of the pipes 72 and the hopper 70. This arrangement also allows complete emptying of the pipes 72.

Dans le mode de réalisation proposée par la figure 3, la bande transporteuse 62 déverse également la matière de chargement dans une trémie d'attente 76 dont l'ouverture d'écoulement est contrôlée par un clapet 78. De la trémie 76 la matière de chargement tombe sur une seconde bande transporteuse 80 qui est montée dans un cadre 82 susceptible de pivoter autour d'un axe parallèle à l'axe vertical central 0. Cette seconde bande transporteuse 80 est, en outre, rétractable et, à cet effet, le rouleau antérieur de renvoi 84 peut coulisser dans le sens longitudinal sous l'action d'un vérin 86, la compensation de la longueur de la bande transporteuse étant assurée par un rouleau baladeur libre 88. De cette manière, la bande transporteuse 80 peut déverser la matière de chargement dans chacun des sas 36, 38 et 40.In the embodiment proposed by FIG. 3, the conveyor belt 62 also pours the loading material into a holding hopper 76 whose flow opening is controlled by a valve 78. From the hopper 76 the loading material falls on a second conveyor belt 80 which is mounted in a frame 82 capable of pivoting about an axis parallel to the central vertical axis 0. This second conveyor belt 80 is, moreover, retractable and, for this purpose, the front deflection roller 84 can slide in the longitudinal direction under the action of a jack 86, compensation for the length of the conveyor belt being ensured by a free sliding roller 88. In this way , the conveyor belt 80 can pour the loading material into each of the airlocks 36, 38 and 40.

Comme mentionné dans l'introduction, l'objectif principal de l'invention est de supprimer la ségrégation ou, du moins, d'en atténuer les effets. L'un des facteurs contribuant à la réalisation de cet objectif est le remplacement de la trémie unique à grande capacité du document AP-A-0 062 770 par quatre enceintes à faible diamètre. Par exemple dans un mode de réalisation préféré, la capacité de chacun des sas 36, 38 et 40 ainsi que celle de la trémie 16 n'est que de 20 m3 contre 80 m3 pour le document précité. En plus, chacun des sas ainsi que la trémie 16 ont une forme très effilée, l'angle de leur paroi conique avec l'axe vertical ne dépassant pas 30 °. L'idéal serait, soit dit en passant, des enceintes carrément tubulaires dont la section est égale à la section de la tubulure d'écoulement. Toutefois, ceci est difficilement réalisable à cause de l'augmentation de hauteur qui en résulte. Il faut par conséquent, trouver un compromis entre la hauteur disponible et la section des sas et de la trémie de stockage.As mentioned in the introduction, the main objective of the invention is to eliminate segregation or, at least, to mitigate its effects. One of the factors contributing to the achievement of this objective is the replacement of the single large capacity hopper of document AP-A-0 062 770 with four small diameter enclosures. For example in a preferred embodiment, the capacity of each of the airlocks 36, 38 and 40 as well as that of the hopper 16 is only 20 m 3 against 80 m 3 for the aforementioned document. In addition, each of the airlocks and the hopper 16 have a very tapered shape, the angle of their conical wall with the vertical axis not exceeding 30 °. The ideal would be, by the way, downright tubular enclosures whose section is equal to the section of the flow tubing. However, this is difficult to achieve because of the resulting increase in height. It is therefore necessary to find a compromise between the available height and the section of the airlocks and the storage hopper.

Dans chacun des sas 36, 38 et 40 on a monté un caisson anti-ségrégation 90 connu en soi. Un tel caisson diminue la ségrégation lors du remplissage et favorise un écoulement plus uniforme lors de la vidange. Dans la trémie 16 se trouve également un caisson anti-ségrégation central 94 et, en plus, un caisson annulaire supérieur 92. Ces caissons diminuent le roulement des particules et favorisent la projection des fines contre la paroi alors que, sans la présence des caissons, celles-ci ont tendance à s'accumuler le long de l'axe 0.In each of the airlocks 36, 38 and 40, an anti-segregation box 90 known per se has been mounted. Such a box reduces segregation during filling and promotes a more uniform flow during emptying. In the hopper 16 there is also a central anti-segregation box 94 and, in addition, an upper annular box 92. These boxes reduce the rolling of particles and promote the projection of fines against the wall whereas, without the presence of boxes, these tend to accumulate along the 0 axis.

La rotation de la trémie 16 atténue également dans une certaine mesure, la ségrégation. Toutefois, le but essentiel de cette rotation est d'assurer le remplissage correct de la trémie 16. Cette rotation, qui se fait à une vitesse de 6 à 8 tours par minute permet au contenu d'un sas d'être déposé dans la trémie 16 suivant la ligne de chargement 96 avec seulement un léger creux dans la région centrale.The rotation of the hopper 16 also attenuates segregation to a certain extent. However, the main purpose of this rotation is to ensure correct filling of the hopper 16. This rotation, which takes place at a speed of 6 to 8 revolutions per minute, allows the contents of an airlock to be deposited in the hopper 16 along the loading line 96 with only a slight dip in the central region.

On va maintenant décrire un procédé de chargement d'un four avec une installation à trois sas de 20 m3 chacun et une trémie de 30 m3.We will now describe a process for loading an oven with an installation with three airlocks of 20 m 3 each and a hopper of 30 m 3 .

Les données de départ sont les suivantes:

Figure imgb0001
Figure imgb0002
 The starting data are as follows:
Figure imgb0001
Figure imgb0002

Le schéma de chargement de la figure 4 est en fait une superposition de 4 graphiques sur la même base de temps. Le graphique montre les phases successives d'une durée de 265 secondes chacune des chargements alternatifs de coke et de minerai. Le graphique Il représente la vidange des trois sas qui n'ont plus été représentés par leurs références numériques 36,38 et 40, mais, pour une question de commodité par les lettres A, B, C. Le graphique III représente le chargement des trois sas A, B et C, tandis que le graphique IV représente l'alimentation en coke et en minerai au moyen de la bande transporteuse 62.The loading diagram in Figure 4 is actually an overlay of 4 graphics on the same time base. The graph shows the successive phases lasting 265 seconds each of the alternative loads of coke and ore. The graph It represents the emptying of the three airlocks which were no longer represented by their numerical references 36, 38 and 40, but, for the sake of convenience by the letters A, B, C. The graph III represents the loading of the three airlock A, B and C, while graph IV represents the supply of coke and ore by means of the conveyor belt 62.

Les 13 premières secondes sont réservées à l'ouverture des clapets de dosage 30 vers une position correspondant à un débit de 0,335 m3 par seconde de matière de chargement. Au temps de départ t = 0 les clapets d'étanchéité et de dosage du sas A sont ouverts et pendant ces 13 secondes le contenu de ce sas A est transféré complètement dans la trémie 16 (voir graphique 11). Pendant ce temps se termine le remplissage du sas B et commence le remplissage du sas C (voir graphique III) alors que l'apport d'une couche continue de 80 m3 par la bande transporteuse (voir graphique IV) se poursuit. Dans l'exemple représenté, on a supposé, à titre d'exemple, que l'on dépose d'abord une couche de coke, ce qui est symbolisé par le trait gras noir.The first 13 seconds are reserved for opening the metering valves 30 to a position corresponding to a flow rate of 0.335 m 3 per second of loading material. At the start time t = 0 the airlock and metering valves of the airlock A are open and during these 13 seconds the content of this airlock A is completely transferred into the hopper 16 (see graph 11). During this time the filling of airlock B ends and the filling of airlock C begins (see graph III) while the supply of a continuous layer of 80 m 3 by the conveyor belt continues (see graph IV). In the example shown, it has been assumed, by way of example, that a layer of coke is first deposited, which is symbolized by the bold black line.

Après 13 secondes débute l'écoulement du coke sur la goulotte de distribution à un débit de 0,335 m3 par seconde. Les sas A qui est maintenant vidé de son contenu peut être préparé pour un prochain remplissage. A cet effet, son clapet de dosage et son clapet d'étanchéité inférieurs sont fermés et l'on procède à sa ventilation. Lorsque la pesée permanente de la chambre 20 et de la trémie 16 indique que le contenu de celle-ci est descendu jusqu'à un certain niveau, on transfère également en 13 secondes, le contenu du sas B dans la trémie 16 pendant que l'écoulement de celle-ci se poursuit. Le remplissage du sas C qui se poursuit également arrive à son terme et dès que celui-ci est rempli, le sas A dont le clapet d'étanchéité supérieur vient d'être ouvert reçoit maintenant les vingt derniers m3 de coke de la bande transporteuse.After 13 seconds, the flow of coke begins on the distribution chute at a rate of 0.335 m 3 per second. The airlocks A which is now emptied of its contents can be prepared for a next filling. For this purpose, its metering valve and its lower sealing valve are closed and ventilation is carried out. When the permanent weighing of the chamber 20 and of the hopper 16 indicates that the content of the latter has gone down to a certain level, the content of the airlock B is also transferred in the hopper 16 in 13 seconds while the flow thereof continues. The filling of the airlock C which also continues comes to an end and as soon as this one is filled, the airlock A whose upper sealing valve has just been opened now receives the last twenty m 3 of coke from the conveyor belt .

Pendant le remplissage du sas A l'on procède à la pressurisation du sas C et dès que le niveau de la trémie 16 est tombé suffisamment bas on transfère le contenu du sas C dans la trémie. Lorque le sas A est rempli l'on procède également sa pressurisation, en vue du transfert de son contenu dans la trémie 16. Lorsque ceci aura été fait, l'on aura vidé deux fois le contenu du sas A et une fois le contenu de chacun des sas B et C dans la trémie, soit 4 x 20 = 80 m3. Ces 80 m3 de coke sont déposés au bout de 252 secondes en une couche uniforme d'un mètre en cercle concentrique depuis l'extérieur vers le centre de la surface de chargement. Après ces 252 secondes le clapet 30 de la trémie 16 est fermé pour préparer le cycle de chargement du minerai.During the filling of the airlock A we pressurize the airlock C and as soon as the level of the hopper 16 has fallen sufficiently low we transfer the contents of airlock C in the hopper. When the airlock A is filled we also pressurize it, in order to transfer its content into the hopper 16. When this has been done, we will have emptied twice the content of airlock A and once the content of each of the airlocks B and C in the hopper, i.e. 4 x 20 = 80 m 3 . These 80 m 3 of coke are deposited after 252 seconds in a uniform layer of one meter in a concentric circle from the outside towards the center of the loading surface. After these 252 seconds the valve 30 of the hopper 16 is closed to prepare the ore loading cycle.

Ce cycle de chargement du minerai a, en fait, déjà débuté à un niveau supérieur, par la remontée par le transporteur 62 d'une nappe de 80 m3 de minerai et le remplissage des sas B et C.This ore loading cycle has in fact already started at a higher level, by the ascent by the conveyor 62 of a sheet of 80 m 3 of ore and the filling of the airlocks B and C.

A la fin du premier cycle, c'est-à-dire après 265 secondes on transfère pendant 13 secondes le contenu de minerai du sas B vers la trémie 16 et en même temps on ajuste l'ouverture des clapets de dosage sur une position d'écoulement correspondant à un débit de 0,335 m3 par seconde. Pendant que le sas B est vidé, l'opération de remplissage du sas C se termine et le remplissage du sas A en minerai commence. Après 13 secondes du second cycle débute le chargement en minerai. Ce chargement est analogue au chargement en coke, c'est-à-dire que l'on vide successivement le contenu des sas B-C, A et B chaque fois que le pesage de la trémie 16 en fournit la demande.At the end of the first cycle, that is to say after 265 seconds, the ore content is transferred for 13 seconds from the airlock B to the hopper 16 and at the same time the opening of the metering valves is adjusted to a position d flow corresponding to a flow of 0.335 m 3 per second. While the airlock B is emptied, the operation of filling the airlock C ends and the filling of the airlock A with ore begins. After 13 seconds of the second cycle, loading of ore begins. This loading is analogous to loading with coke, that is to say that the contents of the airlocks BC, A and B are successively emptied each time the weighing of the hopper 16 provides the demand.

La figure 4 dévoile un autre avantage du dispositif selon l'invention par rapport au dispositif connu décrit dans la demande de brevet européen précitée. En effet, comme nous montre le graphique 1 le chargement est quasi-continu, la seule interruption étant l'arrêt de 26 secondes entre chaque cycle pour la manoeuvre du clapet de la trémie. En tout état de cause il est difficilement possible d'effectuer un chargement continu à 100% étant donné qu'après le depôt de chaque couche il est nécessaire de couper le chargement pour redresser la goulotte et commencer une nouvelle couche par la périphérie.FIG. 4 reveals another advantage of the device according to the invention compared to the known device described in the aforementioned European patent application. Indeed, as shown in graph 1, loading is almost continuous, the only interruption being the stop of 26 seconds between each cycle for the operation of the hopper valve. In any event, it is difficult to carry out a continuous loading at 100% since after the deposition of each layer it is necessary to cut the loading to straighten the chute and start a new layer at the periphery.

Claims (12)

1. Charging installation for a shaft furnace, having a rotary chute or oscillating chute distribution device and a storage hopper which is mounted on the vertical axis of the furnace and of which the discharge orifice towards the chute is controlled by a dispensing means designed to increase and reduce the discharge cross-section symmetrically about the said vertical axis, characterized in that the storage hopper (16) and the dispensing means (30) are rotatable about the vertical axis (0) and are mounted inside a sealed chamber (20), above which are located at least two locks, each provided with an upper sealing flap (52) and a lower sealing flap (50) and in that the hopper (16) and the bottom of each of the locks are in the form of a tapered funnel, the conical wall of which forms an angle of less than 30° with the vertical axis (0) of the furnace.
2. Installation according to Claim 1, characterized in that the chamber (20) has three locks (36, 38, 40) arranged above it.
3. Installation according to either one of Claims 1 or 2, characterized in that the maximum diameter of the hopper (16) and of each of the locks (36, 38, 40) is less than or equal to three metres.
4. Installation according to Claim 1, characterized in that the storage hopper (16) is carried by support and guide rollers (22) which can move on a circulair rail (26) integral with the wall of the chamber (20), and is subjected to the action of a drive mechanism for rotating it about the vertical axis (0) of the furnace.
5. Installation according to Claim 1, characterized by anti-segregation boxes (90, 94) mounted approximately in the centre of each of the locks (36, 38, 40) and of the hopper (16).
6. Installation according to Claim 5, characterized by an additional box provided in the upper part of the hopper (16), this box (92) having an annular shape and being provided approximately unterneath the orifices communicating with the locks.
7. Installation according to one of Claims 1 or 2, characterized by three flap housings (42, 44, 46) establishing communication between each of the locks (36, 38, 40) and the hopper (16) and each containing a dispensing flap (48) and a sealing flap (50).
8. Installation according to Claim 7, characterized by compensators (56) located between each of the housings (42, 44, 46) and the chamber (20) and by a compensator (54) located between the bottom of the chamber (20) and the head of the furnace, and in that the tree locks rest on separate strain gauges (60) for weighing the locks individually, and in that the chamber (20) rests on strain gauges (58) for weighing the hopper (16) and the chamber (20).
9. Installation according to any of Claims 2 to 8, characterized in that the charging material is distributed in the locks (36, 38, 40) from a stand-by hopper (64) below which is located a rotary chute (68) which successively makes the connection between the hopper (64) and each of the locks (36, 38, 40).
10. Installation according to any of Claims 2 to 8 characterized in that the charging material is distributed towards the three locks from a stand-by hopper (70), the bottom of which is provided with three fixed discharge pipes (72) connecting the hopper (70) to each of the locks (36, 38, 40).
11. Installation according to any of Claims 2 to 8, characterized in that the charging material is distributed in the three locks by means of a retractable conveyor belt (80) mounted on a support capable of pivoting about an axis parallel to the vertical axis (0).
12. Installation according to Claim 11, characterized in that the front roller (84) of the conveyor belt (80) is subject to the action of a jack (86) so as to slide in the longitudinal direction of the belt.
EP86102912A 1985-03-15 1986-03-05 Charging apparatus for a shaft furnace Expired EP0196486B1 (en)

Priority Applications (1)

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AT86102912T ATE37200T1 (en) 1985-03-15 1986-03-05 DEVICE FOR LOADING A SHAFT FURNACE.

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LU85811A LU85811A1 (en) 1985-03-15 1985-03-15 LOADING SYSTEM FOR A TANK OVEN
LU85811 1985-03-15

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EP0196486A1 EP0196486A1 (en) 1986-10-08
EP0196486B1 true EP0196486B1 (en) 1988-09-14

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JP (1) JPH0735524B2 (en)
KR (1) KR930009385B1 (en)
CN (1) CN1004230B (en)
AT (1) ATE37200T1 (en)
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DE (1) DE3660723D1 (en)
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KR930009385B1 (en) 1993-10-02
CN1004230B (en) 1989-05-17
UA8328A1 (en) 1996-03-29
CA1263231A (en) 1989-11-28
BR8601267A (en) 1986-12-02
EP0196486A1 (en) 1986-10-08
JPH0735524B2 (en) 1995-04-19
DE3660723D1 (en) 1988-10-20
SU1498395A3 (en) 1989-07-30
IN164440B (en) 1989-03-18
JPS61264113A (en) 1986-11-22
KR860007384A (en) 1986-10-10
LU85811A1 (en) 1986-10-06
ATE37200T1 (en) 1988-09-15
US4728240A (en) 1988-03-01
PL155071B1 (en) 1991-10-31
CN86101639A (en) 1986-12-03

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