EP0116142B1 - Cooling device for a shaft furnace charging installation - Google Patents

Cooling device for a shaft furnace charging installation Download PDF

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Publication number
EP0116142B1
EP0116142B1 EP83112197A EP83112197A EP0116142B1 EP 0116142 B1 EP0116142 B1 EP 0116142B1 EP 83112197 A EP83112197 A EP 83112197A EP 83112197 A EP83112197 A EP 83112197A EP 0116142 B1 EP0116142 B1 EP 0116142B1
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EP
European Patent Office
Prior art keywords
rotary
annular
cage
vat
accordance
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
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EP83112197A
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German (de)
French (fr)
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EP0116142A1 (en
Inventor
Edouard Legille
Gilbert Bernard
Giovanni Cimenti
Guy Thillen
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Paul Wurth SA
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Paul Wurth SA
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Priority to AT83112197T priority Critical patent/ATE23195T1/en
Publication of EP0116142A1 publication Critical patent/EP0116142A1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor
    • 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 device for cooling a loading installation of a shaft furnace, comprising a fixed supply channel arranged vertically in the center of the furnace head, a rotary ferrule mounted coaxially around said supply channel , a fixed external carcass mounted coaxially outside said ferrule and laterally delimiting therewith a substantially annular chamber, this chamber being separated, but not isolated, from the interior of the furnace by means of a rotary cage integral with the rotary ferrule, a distribution chute, pivotally mounted in the rotary cage, a first drive means for rotating, as a unit, the ferrule, the cage and the chute around the vertical axis of the furnace and of the channel supply and a second drive means for pivoting the chute, independently of the movement resulting from the first drive means about its horizontal axis of suspension from the ferrule e.
  • This gas cooling has the advantage of not requiring any particular construction in the loading installation.
  • accessory installations for cleaning, cooling and compressing gases are extremely expensive, consume a lot of energy and require a lot of maintenance.
  • the object of the present invention is the contribution to the solution of these problems by a new water cooling device of the loading installation.
  • the invention provides a cooling device for a loading installation of a shaft furnace of the kind described in the preamble, which is essentially characterized by an annular feed tank fixed to the upper edge of the shell. rotary and whose two outer and inner concentric walls slide, by interposition of a seal, in an annular block fixed to the upper part of the carcass, below at least one cooling water intake pipe and provided at least one opening for the passage, by gravity, of the water in the tank, by several cooling coils arranged around the rotary cage and each connected by a pipe to said annular tank, by an annular collector fixed to the outer casing, by a rotary annular cover associated with said collector and fixed to the rotary cage and by pipes connecting each of the coils to said collector through the cover rotary, so that the water flows by gravity between the annular tank and the collector through said pipes and coils.
  • the passage openings in the annular block are preferably angularly offset relative to the intake pipes while the block has over the length of this offset a substantially horizontal groove for the flow of water for cooling.
  • the supply and discharge lines of the coils are preferably flexible to compensate for thermal and mechanical deformations.
  • an access opening is provided through the upper part of the carcass and the annular block.
  • the lower surface of the mobile cage is lined with insulating panels held by refractory steel sheets fixed to the cage by means of bolts with the interposition of insulating fibers eliminating thermal bridges.
  • An isolation labyrinth between the outer casing and the rotating cage prevents the rise of dust in the annular chamber.
  • An adaptation of the pressure inside the annular chamber to that prevailing in the furnace also contributes to preventing the rise of dust in this chamber.
  • FIG. 1 there is shown the upper part of a distribution chute 10 whose drive and suspension mechanism, generally represented by the reference 12 is of the type described in the aforementioned patent US-A-3,880,302 and does not will be described, therefore, that superficially, the reader will want to refer to the aforementioned patent for further details.
  • the drive mechanism essentially comprises two sets of gears 14 and 16 respectively serving for the rotation of a ferrule 18 around a central supply channel 20 for the rotation of the distribution chute 10 around the longitudinal axis of the furnace, respectively of the angular adjustment of the chute 10 with respect to this longitudinal axis.
  • the sets of gears 14 and 16 are driven respectively by a first and a second motor, not shown.
  • the transmission of movement between the gear 16 and the axes of suspension of the chute is effected by means of a ring gear 28 and two gear housings, not shown, but also described in detail in the aforementioned patent.
  • This annular chamber 26 is separated from the interior of the furnace by a cage 30 for hanging the chute, this cage 30 being integral with the rotary ferrule.
  • the parts directly exposed to the heat of the oven are the walls of the cage 30 and, to a lesser degree, the supply channel 20.
  • the invention provided for coating this cage with several cooling coils, three of which are shown in FIG. 1, namely the coils 32, 34 and 36 and in which water is circulated by gravity. Each of these coils is connected by means of a vertical pipe 38 running along the ferrule 18, to an annular supply tank 40 fixed on the upper edge of the rotary ferrule and shown in detail in FIG. 2.
  • This annular tank 40 which has a rectangular section is simply formed by the addition of an outer wall 42 to the shell 18 and defining with it the side edges of this tank 40. These side edges slide, during the rotation of the chute in an inner groove of an annular block 44 fixed on the upper part 50 of the outer carcass 24.
  • the block 44 has a passage opening 52 placing the tank 40 in communication with a pipe 54 for admitting cooling water.
  • the passage opening 52 is not located opposite the supply line 54, the communication being provided by a groove 56 which is substantially horizontal and which, when there is only an intake pipe 54 goes almost all around the annular block 44.
  • the purpose of the flow of cooling water in the groove 56 is to cool this block 44.
  • At least one access opening 58 passing through the upper part 50 of the carcass as well as the annular block 44.
  • each of the cooling circuits is connected through an evacuation pipe 64 fixed to the cover 62 by means of a connection block 66, to the manifold 60.
  • each of the pipes 38 and 64 preferably comprises a compensator with bellows 68.
  • the interior surfaces of the cage 30 are lined with insulating panels 70 held by sheets 72 of refractory steel, fixed to the walls of the cage by means of bolts 74 with the interposition of insulating fibers 76, the goal is to remove the thermal bridges between the chamber 26 and the interior of the oven.
  • the insulating panels 70 can have a thickness of approximately 75 mm.
  • the vertical walls of the cage 30 can also be lined with insulating panels 78 which can, however, be thinner, for example 25 mm, since the vertical surfaces are less exposed than the horizontal surfaces.
  • Another characteristic of the invention is a joint in the form of a labyrinth between the carcass and the rotary cage 30, the aim of which is to contribute to a better separation between the chamber 26 and the interior of the oven.
  • This labyrinth can be constituted by a circular groove 80 fixed on the carcass 24 and associated with a peripheral blade 82 of the cage 30, this lamp 82 constantly evolving in the groove 80.
  • the purpose of this labyrinth is to avoid that, as a result pressure variations at the top, there is a significant transition of dust being suspended in the gas in the direction of the chamber 26. In the absence of pressure variation, such a transition is prevented, advantageously by an adaptation of the pressure inside the chamber 26 to that prevailing inside the oven.
  • cooling circuits shown in FIG. 1 it is advantageous to provide two cooling circuits for the axes of suspension of the chute, these cooling circuits being able to be put in parallel with the circuits already described, that is to say be connected between the supply tank 40 and the collector 60 so that the water flows by simple gravity.
  • the reference 24 schematically designates the carcass in which the feed tank 40 and the collector 60 are located, between which the height A H is responsible for the flow of the cooling water by gravity. Between the tank 40 and the collector 60 are connected cooling circuits 86 and a cooling circuit 88 of the axis of the chute.
  • the circulation of the cooling water between the collector 60 and the tank 40 is ensured by a group of circulation pumps 90.
  • the circuit further comprises a heat exchanger 92, a flow meter 94 and a proportional automatic valve. 96.
  • An auxiliary circuit 98 with an automatic valve (100) makes it possible to introduce additional water into the circuit in order to compensate for the losses by evaporation.
  • the circuit is also provided with a drain pipe 102 associated with an automatic valve 104.
  • the circulation of water in the cooling circuit is automatically controlled under the control of four level measurements associated with the tank 40 and four associated level measurements in the collector 60.
  • the level in the collector 60 must be between the minimum and maximum levels i . If, for whatever reason, the level drops to a minimum, an alarm signal and automatic water replenishment are produced through the automatic valve 100. If, however, the level drops further, the pumps 90 are automatically stopped at min level 2 to prevent them from running empty. When the level rises as a result of the supply through line 98 the valve 100 is closed automatically as soon as the level reaches max i . If despite the closing of the valve 100 the level rises further, the valve 104 is opened automatically to allow the flow of water through the drain pipe 102 in order to prevent the water from overflowing and falling in the oven.
  • the level In the tank 40 the level must be, in normal operation between the minimum and maximum marks i . If the level drops to a minimum, the pumps 90 are controlled to run at full speed and the valve 96 is fully open. As soon as the rising level reaches the max mark, the proportional valve 96 progressively reduces the flow rate and commands a corresponding progressive reduction in the speed of the pumps 90. When the level reaches the threshold maX 2 the valve 96 is completely closed and the pumps 90 are stopped .
  • the level In normal operation, the level should not drop beyond the min 1 mark. If, despite this, the level falls below the mini mark, the automatic valve 100 is open to ensure replenishment through the manifold 60. Therefore the level should rise again in the tank 40 following the action of the pumps 90. If, despite the supply through line 98 and the action of the pumps, the level in tank 40 continues to fall, an alarm signal is triggered at the min 2 mark, which indicates that there probably has a leak at one of the consumers 86 or 88. In other words, in normal operation the min 2 levels should never be reached in the tank and in the collector 60 and, similarly, the maX 2 levels should never be overwhelmed. Exceeding these marks constitutes an automatic indication of a malfunction, for example a leak, either at the level of the tank or of the collector 60, or at the level of the consumers.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Blast Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture Of Iron (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Discharge Heating (AREA)
  • Details Of Measuring And Other Instruments (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Details (AREA)
  • Heat Treatment Of Articles (AREA)
  • Electric Stoves And Ranges (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

A water cooling apparatus is presented for use in conjunction with a charging device of a shaft furnace, particularly a shaft furnace having a bell-less top charging apparatus. The cooling apparatus essentially comprises an annular feed vat which is attached to the upper portion of a rotary shell and is movable with the rotary shell. The vat is provided with at least one opening whereby water is gravity fed from the vat through plural cooling coils positioned about a rotary jacket. An annular collecting conduit receives the water flowing from the coils. The rotary jacket supports the suspension mechanism of a distribution spout and also acts as the separating structure between the furnace interior and the component parts of the charging device.

Description

La présente invention concerne un dispositif de refroidissement d'une installation de chargement d'un four à cuve, comprenant un canal d'alimentation fixe disposé verticalement dans le centre de la tête du four, une virole rotative montée coaxialement autour dudit canal d'alimentation, une carcasse extérieure fixe montée coaxialement à l'extérieur de ladite virole et délimitant latéralement avec celle-ci une chambre sensiblement annulaire, cette chambre étant séparée, mais non isolée, de l'intérieur du four au moyen d'une cage rotative solidaire de la virole rotative, une goulotte de distribution, montée de manière pivotante dans la cage rotative, un premier moyen d'entraînement pour faire tourner, en bloc, la virole, la cage et la goulotte autour de l'axe vertical du four et du canal d'alimentation et un second moyen d'entraînement pour faire pivoter la goulotte, indépendamment du mouvement résultant du premier moyen d'entraînement autour de son axe horizontal de suspension à la virole.The present invention relates to a device for cooling a loading installation of a shaft furnace, comprising a fixed supply channel arranged vertically in the center of the furnace head, a rotary ferrule mounted coaxially around said supply channel , a fixed external carcass mounted coaxially outside said ferrule and laterally delimiting therewith a substantially annular chamber, this chamber being separated, but not isolated, from the interior of the furnace by means of a rotary cage integral with the rotary ferrule, a distribution chute, pivotally mounted in the rotary cage, a first drive means for rotating, as a unit, the ferrule, the cage and the chute around the vertical axis of the furnace and of the channel supply and a second drive means for pivoting the chute, independently of the movement resulting from the first drive means about its horizontal axis of suspension from the ferrule e.

Une installation de chargement de ce genre est décrite dans le brevet US-A-3 880 302. Il s'agit, en l'occurence, de l'installation de chargement sans cloche la plus répandue actuellement dans le monde, autrement dit, c'est celle qui remplit le mieux les conditions extrêmement difficiles dans lesquelles doit opérer une telle installation, notamment à cause des températures élevées et de l'atmosphère chargée de poussière corrosives et abrasives.A loading installation of this kind is described in US Pat. No. 3,880,302. It is, in this case, the most widely used bell-less loading installation currently in the world, in other words, c 'is the one that best meets the extremely difficult conditions in which such an installation must operate, in particular because of the high temperatures and the atmosphere laden with corrosive and abrasive dust.

Pour soulager les pièces les plus sollicitées on a prévu, jusqu'à présent, dans les installations de chargement de ce genre, une circulation, sous pression, d'un gaz inerte et refroidi. Cette circulation possède une double fonction, à savoir que le gaz refroidit les pièces qu'il touche et que, par sa pression plus élevée que celle régnant à l'intérieur du four, il se crée un courant dirigé vers l'intérieur du four et à travers les fentes entre les pièces fixes et les pièces en mouvement, courant qui empêche les pussières abrasives de monter dans la chambre annulaire.To relieve the most stressed parts, provision has been made so far in loading installations of this kind for circulation under pressure of an inert and cooled gas. This circulation has a double function, namely that the gas cools the parts which it touches and that, by its higher pressure than that prevailing inside the furnace, a current is created directed towards the interior of the furnace and through the slits between the fixed parts and the moving parts, a current which prevents the abrasive pusher from mounting in the annular chamber.

Ce refroidissement au gaz a l'avantage de ne pas nécessiter de construction particulière dans l'installation de chargement. Par contre, les installations accessoires pour le nettoyage, le refroidissement et la compression des gaz sont extrêmement chères, consomment beaucoup d'énergie et nécessitent beaucoup d'entretien.This gas cooling has the advantage of not requiring any particular construction in the loading installation. On the other hand, accessory installations for cleaning, cooling and compressing gases are extremely expensive, consume a lot of energy and require a lot of maintenance.

Pour diminuer ces frais on a déjà proposé de remplacer le système de refroidissement à gaz par un refroidissement à eau. (voir par exemple LU-A-80112). Toutefois, cette proposition n'a pu être appliquée en pratique jusqu'à présent parce qu'il n'était pas possible, vu les dimensions de l'installation, de prévoir des passages étanches et durables entre les pièces fixes à refroidir et les pièces mobiles à refroidir.To reduce these costs, it has already been proposed to replace the gas cooling system with water cooling. (see for example LU-A-80112). However, this proposal could not be applied in practice until now because it was not possible, given the dimensions of the installation, to provide tight and durable passages between the fixed parts to be cooled and the parts mobile to cool.

Le but de la présente invention est la contribution à la solution de ces problèmes par un nouveau dispositif de refroidissement à eau de l'installation de chargement.The object of the present invention is the contribution to the solution of these problems by a new water cooling device of the loading installation.

Pour atteindre cet objectif, l'invention propose un dispositif de refroidissement pour une installation de chargement d'un four à cuve du genre décrit dans le préambule, qui est essentiellement caractérisé par un bac annulaire d'alimentation fixé sur le bord supérieur de la virole rotative et dont les deux parois concentriques extérieures et intérieures glissent, moyennant interposition d'un joint, dans un bloc annulaire fixé à la partie supérieure de la carcasse, en dessous d'au moins une conduite d'admission d'eau de refroidissement et pourvu d'au moins une ouverture pour le passage, par gravité, de l'eau dans le bac, par plusieurs serpentins de refroidissement disposés autour de la cage rotative et relié chacun par une conduite au dit bac annulaire, par une collecteur annulaire fixé à la carcasse extérieure, par un couvercle annulaire rotatif associé audit collecteur et fixé à la cage rotative et par des conduites reliant chacun des serpentins audit collecteur à travers le couvercle rotatif, de façon que l'eau s'écoule par gravité entre le bac annulaire et le collecteur à travers lesdites conduites et serpentins.To achieve this objective, the invention provides a cooling device for a loading installation of a shaft furnace of the kind described in the preamble, which is essentially characterized by an annular feed tank fixed to the upper edge of the shell. rotary and whose two outer and inner concentric walls slide, by interposition of a seal, in an annular block fixed to the upper part of the carcass, below at least one cooling water intake pipe and provided at least one opening for the passage, by gravity, of the water in the tank, by several cooling coils arranged around the rotary cage and each connected by a pipe to said annular tank, by an annular collector fixed to the outer casing, by a rotary annular cover associated with said collector and fixed to the rotary cage and by pipes connecting each of the coils to said collector through the cover rotary, so that the water flows by gravity between the annular tank and the collector through said pipes and coils.

Les ouvertures de passage dans le bloc annulaire sont, de préférence, décalées angulairement par rapport aux conduites d'admission tandis que le bloc présente sur la longueur de ce décalage une rainure sensiblement horizontale d'écoulement de l'eau en vue de son refroidissement.The passage openings in the annular block are preferably angularly offset relative to the intake pipes while the block has over the length of this offset a substantially horizontal groove for the flow of water for cooling.

Les conduites d'alimentation et d'évacuation des serpentins sont de préférence flexibles pour compenser les déformations thermiques et mécaniques.The supply and discharge lines of the coils are preferably flexible to compensate for thermal and mechanical deformations.

Pour permettre le nettoyage du bac annulaire d'alimentation il est prévu une ouverture d'accès à travers la partie supérieure de la carcasse et le bloc annulaire.To allow cleaning of the annular feed tank, an access opening is provided through the upper part of the carcass and the annular block.

La surface inférieure de la cage mobile est garnie de panneaux isolants maintenus par des tôles en acier réfractaire fixés à la cage au moyen de boulons avec interposition de fibres isolantes supprimant les ponts thermiques.The lower surface of the mobile cage is lined with insulating panels held by refractory steel sheets fixed to the cage by means of bolts with the interposition of insulating fibers eliminating thermal bridges.

Un labyrinthe d'isolation entre la carcasse extérieure et la cage rotative empêche la montée des poussières dans la chambre annulaire. Une adaptation de la pression à l'intérieur de la chambre annulaire à celle qui règne dans le four contribue, en outre, à l'empêchement de la remontée des poussières dans cette chambre.An isolation labyrinth between the outer casing and the rotating cage prevents the rise of dust in the annular chamber. An adaptation of the pressure inside the annular chamber to that prevailing in the furnace also contributes to preventing the rise of dust in this chamber.

D'autres particularités et caractéristiques ressortiront de la description détaillée d'un mode de réalisation avantageux présenté ci-dessous, à titre d'illustration, en référence aux dessins dans lesquels:

  • La figure 1 représente schématiquement une coupe verticale à travers un dispositif de chargement selon l'invention;
  • La figure 2 montre les détails de l'alimentation au moyen d'une coupe verticale au niveau d'une conduite d'alimentation;
  • La figure 3 montre une coupe verticale à travers le bloc annulaire au niveau d'une ouverture de passage;
  • la figure 4 montre une coupe verticale à travers un trou d'inspection dans le bloc annulaire;
  • la figure 5 montre les détails de l'évacuation et
  • la figure 6 montre un schéma synoptique illustrant le fonctionnement du système de refroidissement.
Other particularities and characteristics will emerge from the detailed description of an advantageous embodiment presented below, by way of illustration, with reference to the drawings in which:
  • Figure 1 schematically shows a vertical section through a loading device according to the invention;
  • Figure 2 shows the details of the feed by means of a vertical section at a feed line;
  • Figure 3 shows a vertical section through the annular block at a passage opening;
  • Figure 4 shows a vertical section through an inspection hole in the annular block;
  • Figure 5 shows the details of the evacuation and
  • Figure 6 shows a block diagram illustrating the operation of the cooling system.

Sur la figure 1 on a représenté la partie supérieure d'une goulotte de distribution 10 dont le mécanisme d'entraînement et de suspension, représentés globalement par la référence 12 est du type décrit dans le brevet précité US-A-3 880 302 et ne sera décrit, de ce fait, que superficiellement, le lecteur voudra bien se référer au brevet précité pour de plus amples détails.In Figure 1 there is shown the upper part of a distribution chute 10 whose drive and suspension mechanism, generally represented by the reference 12 is of the type described in the aforementioned patent US-A-3,880,302 and does not will be described, therefore, that superficially, the reader will want to refer to the aforementioned patent for further details.

Le mécanisme d'entraînement comporte essentiellement deux jeux d'engrenage 14 et 16 servant respectivement à la rotation d'une virole 18 autour d'un canal d'alimentation centrale 20 en vue de la rotation de la goulotte de distribution 10 autour de l'axe longitudinal du four, respectivement de l'ajustement angulaire de la goulotte 10 par rapport à cet axe longitudinal. Les jeux d'engrenage 14 et 16 sont entraînés respectivement par un premier et un second moteur non montrés. La transmission du mouvement entre l'engrenage 16 et les axes de suspension de la goulotte est effectuée par l'intermédiaire d'une couronne dentée 28 et de deux carters d'engrenage, non montrés, mais également décrits en détail dans le brevet précité.The drive mechanism essentially comprises two sets of gears 14 and 16 respectively serving for the rotation of a ferrule 18 around a central supply channel 20 for the rotation of the distribution chute 10 around the longitudinal axis of the furnace, respectively of the angular adjustment of the chute 10 with respect to this longitudinal axis. The sets of gears 14 and 16 are driven respectively by a first and a second motor, not shown. The transmission of movement between the gear 16 and the axes of suspension of the chute is effected by means of a ring gear 28 and two gear housings, not shown, but also described in detail in the aforementioned patent.

Une carcasse éxtérieure 24 délimite latéralement avec la virole rotative 18 une chambre annulaire 26. Cette chambre annulaire 26 est séparée de l'intérieur du four par une cage 30 de suspension de la goulotte, cette cage 30 étant solidaire de la virole rotative.An outer carcass 24 laterally delimits with the rotary ferrule 18 an annular chamber 26. This annular chamber 26 is separated from the interior of the furnace by a cage 30 for hanging the chute, this cage 30 being integral with the rotary ferrule.

Il est évident que les parties directement exposées à la chaleur du four sont les parois de la cage 30 et, à un degré moindre, le canal d'alimentation 20. Pour protéger cette cage 30 des températures élevées et pour éviter qu'elle ne transmette soit par conduction, soit par rayonnement, la chaleur à d'autres pièces, comme par exemple les roulements et engrenages, l'invention a prévu d'enrober cette cage de plusieurs serpentins de refroidissement dont on en a représenté trois sur la figure 1, à savoir les serpentins 32, 34 et 36 et dans lesquels on fait circuler de l'eau par voie de gravité. Chacun de ces serpentins est relié au moyen d'une conduite verticale 38 longeant la virole 18, à un bac annulaire d'alimentation 40 fixé sur le bord supérieur de la virole rotative et montré en détail sur la figure 2.It is obvious that the parts directly exposed to the heat of the oven are the walls of the cage 30 and, to a lesser degree, the supply channel 20. To protect this cage 30 from high temperatures and to prevent it from transmitting either by conduction or by radiation, the heat to other parts, such as for example the bearings and gears, the invention provided for coating this cage with several cooling coils, three of which are shown in FIG. 1, namely the coils 32, 34 and 36 and in which water is circulated by gravity. Each of these coils is connected by means of a vertical pipe 38 running along the ferrule 18, to an annular supply tank 40 fixed on the upper edge of the rotary ferrule and shown in detail in FIG. 2.

Ce bac annulaire 40 qui a une section rectangulaire est simplement formé par l'adjonction d'une paroi extérieure 42 à la virole 18 et définissant avec celle-ci les bords latéraux de ce bac 40. Ces bords latéraux glissent, lors de la rotation de la goulotte dans une rainure intérieure d'un bloc annulaire 44 fixé sur la partie supérieure 50 de la carcasse éxtérieure 24. Deux joints 46 et 48 associés soit au bord extérieur du bac 40, soit au bord intérieur de la rainure du bloc 44 empêchent la pénétration des poussières dans ce bac 40. Il est à noter que les joints 46 et 48 ne doivent pas assumer de fonction d'étanchéité.This annular tank 40 which has a rectangular section is simply formed by the addition of an outer wall 42 to the shell 18 and defining with it the side edges of this tank 40. These side edges slide, during the rotation of the chute in an inner groove of an annular block 44 fixed on the upper part 50 of the outer carcass 24. Two seals 46 and 48 associated either with the outer edge of the tank 40 or with the inner edge of the groove in the block 44 prevent the penetration of dust into this tank 40. It should be noted that the seals 46 and 48 must not assume a sealing function.

Le bloc 44 comporte une ouverture de passage 52 mettant le bac 40 en communication avec une conduite 54 d'admission d'eau de refroidissement.The block 44 has a passage opening 52 placing the tank 40 in communication with a pipe 54 for admitting cooling water.

Comme l'indiquent les figures 2 et 3 l'ouverture de passage 52 ne se trouve pas en face de la conduite d'alimentation 54, la communication étant assurée par une gorge 56 sensiblement horizontale et pouvant, lorsqu'il n'y a qu'une conduite d'admission 54 faire presque tout le tour du bloc annulaire 44. L'écoulement de l'eau de refroidissement dans la gorge 56 a pour but le refroidissement de ce bloc 44.As indicated in FIGS. 2 and 3, the passage opening 52 is not located opposite the supply line 54, the communication being provided by a groove 56 which is substantially horizontal and which, when there is only an intake pipe 54 goes almost all around the annular block 44. The purpose of the flow of cooling water in the groove 56 is to cool this block 44.

Pour permettre le nettoyage du bac 40 il est prévu au moins une ouverture d'accès 58 (voir figures 1 et 4) traversant la partie supérieure 50 de la carcasse ainsi que le bloc annulaire 44.To allow cleaning of the tank 40 there is provided at least one access opening 58 (see FIGS. 1 and 4) passing through the upper part 50 of the carcass as well as the annular block 44.

L'évacuation de l'eau de tous les circuits de refroidissement est effectuée à travers un collecteur annulaire 60 fixé sur la paroi intérieure de la carcasse 24 (voir figures 1 et 5). Pour permettre la rotation des circuits associés à la cage 30, le collecteur 60 comporte un couvercle annulaire 62 fixé sur la cage 30 et glissant, lors de la rotation de cette cage sur les deux parois définissant ce collecteur 60. Chacun des circuits de refroidissement est relié à travers une conduite d'évacuation 64 fixée au couvercle 62 au moyen d'un bloc de con- nection 66, au collecteur 60. Pour compenser les déformations thermiques et mécaniques chacune des conduites 38 et 64 comporte, de préférence, un compensateur à soufflets 68.The water is removed from all the cooling circuits through an annular collector 60 fixed to the interior wall of the carcass 24 (see FIGS. 1 and 5). To allow rotation of the circuits associated with the cage 30, the collector 60 includes an annular cover 62 fixed on the cage 30 and sliding, during the rotation of this cage on the two walls defining this collector 60. Each of the cooling circuits is connected through an evacuation pipe 64 fixed to the cover 62 by means of a connection block 66, to the manifold 60. To compensate for thermal and mechanical deformations each of the pipes 38 and 64 preferably comprises a compensator with bellows 68.

Comme le montre la figure 1, les surfaces intérieures de la cage 30 sont garnies de panneaux isolants 70 maintenus par des tôles 72 en acier réfractaire, fixés aux parois de la cage à l'aide de boulon 74 avec interposition de fibres isolantes 76 dont le but est de supprimer les ponts thermiques entre la chambre 26 et l'intérieur du four. Les panneaux isolants 70 peuvent avoir une épaisseur d'environ 75 mm. Les parois verticales de la cage 30 peuvent être garnies également de panneaux isolants 78 qui peuvent, néanmoins, être plus minces, par exemple 25 mm, étant donné que les surfaces verticales sont moins exposées que les surfaces horizontales.As shown in FIG. 1, the interior surfaces of the cage 30 are lined with insulating panels 70 held by sheets 72 of refractory steel, fixed to the walls of the cage by means of bolts 74 with the interposition of insulating fibers 76, the goal is to remove the thermal bridges between the chamber 26 and the interior of the oven. The insulating panels 70 can have a thickness of approximately 75 mm. The vertical walls of the cage 30 can also be lined with insulating panels 78 which can, however, be thinner, for example 25 mm, since the vertical surfaces are less exposed than the horizontal surfaces.

Une autre caractéristique de l'invention est un joint en forme de labyrinthe entre la carcasse et la cage rotative 30, dont le but est de contribuer à une meilleure séparation entre la chambre 26 et l'intérieur du four. Ce labyrinthe peut être constitué par une rainure circulaire 80 fixée sur la carcasse 24 et associée à une lame périphérique 82 de la cage 30, cette lampe 82 évoluant constamment dans la rainure 80. Le but de ce labyrinthe est d'éviter que, par suite de variations de pression au gueulard, il y ait une transition importante de poussières se trouvant en suspension dans le gaz en direction de la chambre 26. En l'absence de variation de pression une telle transition est empêchée, avantageusement par une adaptation de la pression à l'intérieur de la chambre 26 à celle régnant à l'intérieur du four.Another characteristic of the invention is a joint in the form of a labyrinth between the carcass and the rotary cage 30, the aim of which is to contribute to a better separation between the chamber 26 and the interior of the oven. This labyrinth can be constituted by a circular groove 80 fixed on the carcass 24 and associated with a peripheral blade 82 of the cage 30, this lamp 82 constantly evolving in the groove 80. The purpose of this labyrinth is to avoid that, as a result pressure variations at the top, there is a significant transition of dust being suspended in the gas in the direction of the chamber 26. In the absence of pressure variation, such a transition is prevented, advantageously by an adaptation of the pressure inside the chamber 26 to that prevailing inside the oven.

On peut, d'ailleurs, prévoir un labyrinthe analogue entre le canal fixe 20 et la virole rotative 18, tel que illustré par la lame 84 entre la cage 30 et le canal 20.One can, moreover, provide a similar labyrinth between the fixed channel 20 and the rotary ferrule 18, as illustrated by the blade 84 between the cage 30 and the channel 20.

En dehors des circuits de refroidissement montrés par la figure 1, il est avantageux de prévoir deux circuits de refroidissement des axes de suspension de la goulotte, ces circuits de refroidissement pouvant être mis en parallèle avec les circuits déjà décrits c'est-à-dire être branchés entre le bac d'alimentation 40 et le collecteur 60 de façon que l'eau s'écoule par simple gravité.Apart from the cooling circuits shown in FIG. 1, it is advantageous to provide two cooling circuits for the axes of suspension of the chute, these cooling circuits being able to be put in parallel with the circuits already described, that is to say be connected between the supply tank 40 and the collector 60 so that the water flows by simple gravity.

On va maintenant expliquer le fonctionnement du dispositif de refroidissement en référence au schéma synoptique illustré par la figure 6, dans laquelle on a utilisé les mêmes chiffres de références qu'aux figures précédentes pour désigner les mêmes éléments. La référence 24 désigne schématiquement la carcasse dans laquelle se trouve le bac d'alimentation 40 et le collecteur 60, entre lesquels la hauteur A H est responsable de l'écoulement de l'eau de refroidissement par gravité. Entre le bac 40 et le collecteur 60 sont branchés des circuits de refroidissement 86 et un circuit de refroidissement 88 de l'axe de la goulotte.We will now explain the operation of the cooling device with reference to the block diagram illustrated in Figure 6, in which we used the same reference numbers as in the previous figures to designate the same elements. The reference 24 schematically designates the carcass in which the feed tank 40 and the collector 60 are located, between which the height A H is responsible for the flow of the cooling water by gravity. Between the tank 40 and the collector 60 are connected cooling circuits 86 and a cooling circuit 88 of the axis of the chute.

La circulation de l'eau de refroidissement entre le collecteur 60 et le bac 40 est assurée par un groupe de pompes de circulation 90. Le circuit comporte, en outre, un échangeur de chaleur 92, un débimètre 94 ainsi qu'une vanne automatique proportionelle 96. Un circuit d'appoint 98 avec une vanne automatique (100) permet d'introduire de l'eau supplémentaire dans le circuit afin de compenser les pertes par évaporation. Le circuit est également pourvu d'une conduite de vidange 102 associée à une vanne automatique 104.The circulation of the cooling water between the collector 60 and the tank 40 is ensured by a group of circulation pumps 90. The circuit further comprises a heat exchanger 92, a flow meter 94 and a proportional automatic valve. 96. An auxiliary circuit 98 with an automatic valve (100) makes it possible to introduce additional water into the circuit in order to compensate for the losses by evaporation. The circuit is also provided with a drain pipe 102 associated with an automatic valve 104.

La circulation de l'eau dans le circuit de refroidissement est commandée automatiquement sous le contrôle de quatre mesures de niveau associées au bac 40 et de quatre mesures de niveau associées dans le collecteur 60.The circulation of water in the cooling circuit is automatically controlled under the control of four level measurements associated with the tank 40 and four associated level measurements in the collector 60.

En fonctionnement normal le niveau dans le collecteur 60 doit se situer entre les niveaux mini et maxi. Si, pour une raison ou l'autre, le niveau tombe jusqu'à mini il se produit un signal d'alarme et un réapprovisionnement automatique en eau à travers la vanne automatique 100. Si malgré cela, le niveau tombe d'avantage les pompes 90 sont arrêtées automatiquement au niveau min2 pour éviter qu'elles ne tournent à vide. Lorsque le niveau monte par suite de l'approvisionnement à travers la conduite 98 la vanne 100 est fermée automatiquement dès que le niveau atteint maxi. Si malgré la fermeture de la vanne 100 le niveau monte encore d'avantage, la vanne 104 est ouverte automatiquement pour permettre l'écoulement de l'eau à travers la conduite de vidange 102 afin d'éviter que l'eau ne déborde et tombe dans le four.In normal operation the level in the collector 60 must be between the minimum and maximum levels i . If, for whatever reason, the level drops to a minimum, an alarm signal and automatic water replenishment are produced through the automatic valve 100. If, however, the level drops further, the pumps 90 are automatically stopped at min level 2 to prevent them from running empty. When the level rises as a result of the supply through line 98 the valve 100 is closed automatically as soon as the level reaches max i . If despite the closing of the valve 100 the level rises further, the valve 104 is opened automatically to allow the flow of water through the drain pipe 102 in order to prevent the water from overflowing and falling in the oven.

Dans le bac 40 le niveau doit se trouver, en fonctionnement normal entre les marques mini et maxi. Si le niveau descend jusque mini les pompes 90 sont commandées pour tourner à plein régime et la vanne 96 est complètement ouverte. Dès que le niveau montant atteint la marque max, la vanne proportionnelle 96 réduite progressivement le débit et commande une diminution correspondante progressive du régime des pompes 90. Lorsque le niveau atteint le seuil maX2 la vanne 96 est fermée complètement et les pompes 90 sont arrêtées.In the tank 40 the level must be, in normal operation between the minimum and maximum marks i . If the level drops to a minimum, the pumps 90 are controlled to run at full speed and the valve 96 is fully open. As soon as the rising level reaches the max mark, the proportional valve 96 progressively reduces the flow rate and commands a corresponding progressive reduction in the speed of the pumps 90. When the level reaches the threshold maX 2 the valve 96 is completely closed and the pumps 90 are stopped .

En fonctionnement normal, le niveau ne devrait pas tomber au delà de la marque min1. Si, malgré cela, le niveau tombait en dessous de la marque de mini la vanne automatique 100 est ouverte pour assurer le réapprovisionnement à travers le collecteur 60. Dès lors le niveau devrait à nouveau monter dans le bac 40 parsuite de l'action des pompes 90. Si, malgré l'approvisionnement à travers la conduite 98 et l'action des pompes, le niveau dans le bac 40 continue à tomber, un signal d'alarm est déclenché à la marque min2, ce qui indique qu'il y a probablement une fuite au niveau d'un des consommateurs 86 ou 88. Autrement dit, en fonctionnement normal les niveaux min2 ne doivent jamais être atteints dans le bac et dans le collecteur 60 et, de même, les niveaux maX2 ne doivent jamais être dépassés. Le dépassement de ces marques constitue une indication automatique d'un défaut de fonctionnement, par exemple d'une fuite, soit au niveau du bac ou du collecteur 60, soit au niveau des consommateurs.In normal operation, the level should not drop beyond the min 1 mark. If, despite this, the level falls below the mini mark, the automatic valve 100 is open to ensure replenishment through the manifold 60. Therefore the level should rise again in the tank 40 following the action of the pumps 90. If, despite the supply through line 98 and the action of the pumps, the level in tank 40 continues to fall, an alarm signal is triggered at the min 2 mark, which indicates that there probably has a leak at one of the consumers 86 or 88. In other words, in normal operation the min 2 levels should never be reached in the tank and in the collector 60 and, similarly, the maX 2 levels should never be overwhelmed. Exceeding these marks constitutes an automatic indication of a malfunction, for example a leak, either at the level of the tank or of the collector 60, or at the level of the consumers.

Claims (9)

1. Cooling device for a shaft furnace charging installation, comprising a fixed feed channel (20) positioned vertically in the centre of the furnace head, a rotary shell (18) mounted coaxially around the said feed channel (20), a fixed outer frame (24) mounted coaxially outside the said shell (18) and laterally delimiting with this latter a substantially annular chamber (26), this chamber (26) being separated but not isolated from the interior of the furnace by means of a rotary cage (30) integral with the rotary shell (18), a distribution spout (10) pivotably mounted in the rotary cage (30), a first driving means by which the shell (18), the cage (30) and the spout (10) are caused to rotate as a single unit about the vertical axis of the furnace and of the feed channel (20), and a second driving means serving to cause the spout (10) to pivot, independently of the movement set up by the first driving means about the horizontal axis by which it is suspended from the shell (18), characterized by an annular feed vat (40) which is affixed to the upper edge of the rotary shell (18) and of which the two concentric walls, i.e. the outer and the inner wall, slide with the interposition of a joint (46, 48) in an annular block (44) affixed to the upper part (50) of the frame (24), underneath at least one cooling water admission pipe (54), and which is provided with at least one opening (52) serving to give passage, by gravity, of the water in the vat (40), through a number of cooling coils (30, 32, 34, 36) positioned around the rotary cage (30) and each connected by a pipe (38) to the said annular vat (40), by an annular main (60) affixed to the outer frame (24), by a rotary annular cover (62) associated with the said main (60) and affixed to the rotary cage (30), and by pipes (64) connecting each of the coils (30, 32, 34, 36) to the said main (60) via the rotary cover (62), in such a way that the water flows by gravity between the annular vat (40) and the main (60), via the said pipes and coils.
2. Device in accordance with Claim 1, characterized by the fact that the passages (52) in the annular block (44) are offset angularly in relation to the admission pipes (54), while the block (44) provided, over the length of this offset, with a substantially horizontal groove (56) through which the cooling water flows.
3. Device in accordance with either of Claims 1 and 2, characterized by the fact that the feed pipes (38) and discharge pipes (64) of the coils are made flexible in order to compensate the thermal and mechanical deformations.
4. Device in accordance with Claim 1, characterized by an aperture 58 giving access through the upper part (50) of the frame and the annular block (44).
5. Device in accordance with any one of Claims 1-4, characterized by the fact that the inner surface of the rotable cage (30) is lined with insulating panels (70) secured by refractoring steel plates (72) affixed to the cage (30) by means of bolts (74), insulating fibres (76) being interposed in order to eliminate heat bridges.
6. Device in accordance with Claim 1, characterized by an insulating labyrinth (80, 82) between the frame (24) and the rotary cage (30).
7. Device in accordance with Claim 1, characterized by the fact that the vat (40) and the main (60) are associated with level detectors assuring automatic operation and enabling faults to be detected.
8. Device in accordance with either of Claims 1-7, characterized by two cooling circuits for the suspension axes of the spout, these circuits being likewise connected between the vat (40) and the main (60).
9. Device in accordance with Claim 1, characterized by the fact that joints (46) and (48) are joints designed for the exclusion of dust.
EP83112197A 1982-12-10 1983-12-05 Cooling device for a shaft furnace charging installation Expired EP0116142B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83112197T ATE23195T1 (en) 1982-12-10 1983-12-05 COOLING DEVICE FOR A SHAFT FURNACE FEED PLANT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU84521 1982-12-10
LU84521A LU84521A1 (en) 1982-12-10 1982-12-10 COOLING DEVICE FOR A LOADING INSTALLATION OF A TANK OVEN

Publications (2)

Publication Number Publication Date
EP0116142A1 EP0116142A1 (en) 1984-08-22
EP0116142B1 true EP0116142B1 (en) 1986-10-29

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ID=19729994

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EP83112197A Expired EP0116142B1 (en) 1982-12-10 1983-12-05 Cooling device for a shaft furnace charging installation

Country Status (17)

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US (1) US4526536A (en)
EP (1) EP0116142B1 (en)
JP (1) JPS59116306A (en)
KR (1) KR910000005B1 (en)
AT (1) ATE23195T1 (en)
AU (1) AU563622B2 (en)
BR (1) BR8306932A (en)
CA (1) CA1217050A (en)
CS (1) CS235994B2 (en)
DE (1) DE3367255D1 (en)
ES (1) ES527860A0 (en)
IN (1) IN160180B (en)
LU (1) LU84521A1 (en)
MX (1) MX155924A (en)
SU (1) SU1192628A3 (en)
UA (1) UA7021A1 (en)
ZA (1) ZA838868B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809533A1 (en) * 1987-03-24 1988-10-06 Wurth Paul Sa METHOD AND DEVICE FOR COOLING A CHARGING SYSTEM OF A SHAFT OVEN
DE4216166C2 (en) * 1991-06-12 2001-07-19 Wurth Paul Sa Device for cooling a distribution chute of a shaft furnace loading system

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU84303A1 (en) * 1982-07-28 1984-03-22 Wurth Paul Sa METHOD AND DEVICE FOR CONTROLLING THE MOVEMENT OF AN OSCILLATING CHUTE AND APPLICATION TO A LOADING INSTALLATION OF A TANK OVEN
LU90179B1 (en) * 1997-11-26 1999-05-27 Wurth Paul Sa Method for cooling a charging device of a shaft furnace
LU90294B1 (en) * 1998-10-06 2000-04-07 Wurth Paul Sa Bulk material distribution device
LU90794B1 (en) * 2001-06-26 2002-12-27 Wurth Paul Sa Loading device of a shaft furnace
EP1801241A1 (en) * 2005-12-23 2007-06-27 Paul Wurth S.A. A rotary charging device for a shaft furnace equipped with a cooling system
LU91412B1 (en) * 2008-01-30 2009-07-31 Wurth Paul Sa Charging device for distributing bulk material
LU91601B1 (en) * 2009-08-26 2012-09-13 Wurth Paul Sa Shaft furnace charging device equipped with a cooling system and annular swivel joint therefore
LU91645B1 (en) 2010-01-27 2011-07-28 Wurth Paul Sa A charging device for a metallurgical reactor
LU91717B1 (en) 2010-08-06 2012-02-07 Wurth Paul Sa Distribution device for use in a charging installation of a metallurgical reactor
LU91772B1 (en) * 2011-01-06 2012-07-09 Wurth Paul Metal Tech Beijing A cooling system of a rotary charging device for a shaft furnace
CA3085570C (en) 2012-04-09 2023-08-15 Opex Corporation Method and apparatus for sorting or retrieving items
CN106395434B (en) * 2016-11-01 2018-12-11 中冶焦耐(大连)工程技术有限公司 A kind of rotation liquid packing of revolving top

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LU65312A1 (en) * 1972-05-08 1972-08-23
LU65537A1 (en) * 1972-06-16 1972-10-25
JPS5111014B2 (en) * 1973-01-31 1976-04-08
JPS5113722B2 (en) * 1973-02-02 1976-05-01
LU80112A1 (en) * 1978-08-16 1979-01-19
DE2942121A1 (en) * 1979-10-18 1981-04-30 Klöckner-Humboldt-Deutz AG, 5000 Köln OVEN PLANT, ESPECIALLY FOR MELTING ORE CONCENTRATE
LU82173A1 (en) * 1980-02-15 1980-05-07 Wurth Sa O LOADING DEVICE FOR TANK OVENS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809533A1 (en) * 1987-03-24 1988-10-06 Wurth Paul Sa METHOD AND DEVICE FOR COOLING A CHARGING SYSTEM OF A SHAFT OVEN
DE4216166C2 (en) * 1991-06-12 2001-07-19 Wurth Paul Sa Device for cooling a distribution chute of a shaft furnace loading system

Also Published As

Publication number Publication date
JPS59116306A (en) 1984-07-05
LU84521A1 (en) 1984-10-22
EP0116142A1 (en) 1984-08-22
MX155924A (en) 1988-05-23
UA7021A1 (en) 1995-03-31
ES8500430A1 (en) 1984-11-01
AU563622B2 (en) 1987-07-16
IN160180B (en) 1987-06-27
JPH0354163B2 (en) 1991-08-19
CS235994B2 (en) 1985-05-15
ZA838868B (en) 1984-09-26
US4526536A (en) 1985-07-02
SU1192628A3 (en) 1985-11-15
DE3367255D1 (en) 1986-12-04
ES527860A0 (en) 1984-11-01
CA1217050A (en) 1987-01-27
BR8306932A (en) 1984-07-24
AU2197483A (en) 1984-06-14
KR840007027A (en) 1984-12-04
ATE23195T1 (en) 1986-11-15
KR910000005B1 (en) 1991-01-19

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