EP0110806A1 - Regulating system for delivering solid materials to a blowing lance - Google Patents

Regulating system for delivering solid materials to a blowing lance Download PDF

Info

Publication number
EP0110806A1
EP0110806A1 EP83630175A EP83630175A EP0110806A1 EP 0110806 A1 EP0110806 A1 EP 0110806A1 EP 83630175 A EP83630175 A EP 83630175A EP 83630175 A EP83630175 A EP 83630175A EP 0110806 A1 EP0110806 A1 EP 0110806A1
Authority
EP
European Patent Office
Prior art keywords
gas
lance
pressure
circuit
carbonaceous material
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.)
Granted
Application number
EP83630175A
Other languages
German (de)
French (fr)
Other versions
EP0110806B1 (en
Inventor
Jean Peckels
Antoine Schaaf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Arbed SA filed Critical Arbed SA
Priority to AT83630175T priority Critical patent/ATE32351T1/en
Publication of EP0110806A1 publication Critical patent/EP0110806A1/en
Application granted granted Critical
Publication of EP0110806B1 publication Critical patent/EP0110806B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors

Definitions

  • the present invention relates to a system for adjusting the supply of solids to a lance used to supply a metal bath, in particular a cast iron bath in the process of refining.
  • the invention describes in particular a system, suitable for the introduction of granulated combustible material using neutral carrier gases into the metal being refined in the context of the LD, LD-AC or LBE processes.
  • patent application FR 2 459 835 provides for blowing calcium carbide on the surface of the bath, and this by using refining oxygen as the vehicle for the carbide. It turns out that the carbide carried by the oxygen does not oxidize in the jet, which may a priori surprise.
  • carbides are compounds that are obtained by reactions consuming large amounts of energy which should exclude such a process at a time when energy is expensive.
  • the constraint of recarburizing the bath in reduced time is also reinforced if nitrogen is chosen as the carrier gas for reasons of cost price.
  • the nitrogen jet strikes the surface of the metal bath in the immediate vicinity of the refining oxygen.
  • the degree of dissolution of nitrogen in liquid steel increases with temperature.
  • the object of the invention is to propose a system capable of rapidly injecting a high quantity of granulated combustible material into a metal bath from above.
  • the adjustment system which comprises at least one source of compressed gas, a circuit supplying carbonaceous material suspended in a gas, at least one circuit supplying sweeping gas, means for metering the different gas and carbonaceous material flow rates and means for separately or jointly connecting said circuits to a conduit leading to the lance.
  • FIG. 1 shows a possible embodiment of the system for adjusting the supply of the lance.
  • the insufflation lance 1 which can be a multiflux lance used to supply the bath jointly with oxygen and granulated material, as described for example in patent application LU 84.176, or else a monoflux lance used to inject only granulated material in the bath. In the latter case, the refining oxygen and possibly the post-combustion oxygen is supplied by a separate lance.
  • the lance 1 is mounted on a quick fixing system 2, integral with a carriage or any other mobile system, not shown, used to approach the lance at the desired distance from the surface of the bath.
  • the fastening system is connected to a set 5 of rigid tubes 3 and articulations 4, known as shears as well as to a safety device 6 which detects possible leaks in the body of the lance 1.
  • the leak detection is particularly important in multiflow lances which jointly supply the fuel which is normally abrasive and the oxidizer and can for example be carried out using a sheath filled with a fluid, which surrounds the duct of carbonaceous material the lance and a pressure sensor which monitors the fluid pressure. In case of breaking the sensor records a Variati - one pressure it transmits to the safety device 6 which stops the blowing operation.
  • the shears 5 can be connected at will to the circuit 7 supplying carbonaceous material or to the circuit 8 supplying sweep gas by acting on the respective electromagnetic valves 9 ment 10.
  • the circuit-8 is used to send a determined flow of argon from the source 30 or nitrogen from the source 31 to the lance 1 by opening / closing the valves 21 resp. 22 and by adequately controlling the flow regulator 11.
  • the regulator 11 essentially consists of a pressure sensor 19, a pressure variation sensor 18 and a temperature sensor 20 connected respectively to converters 17 , 16 and 15 which transform the signals picked up into electrical signals that can be processed by the computer 14. The latter determines, depending on the operating mode of the crucible or the state of blockage of the conduits, the required flow rate which it transmits to the regulating valve 12 by means of the amplifier 13. Note that for reasons of clarity, the calculator figure has been drawn in several different places (provided with the references 14a and 14b).
  • valves 24 and 26 are located between the valve 22 and the nitrogen source 31 as well as a pressure regulator 25 which prevents the source 31 from applying pressures. excessive to the purge gas supply circuit 8.
  • a one-way valve 53 prevents any feedback from the carbon material supply circuit 7 to the purge gas supply circuit 8.
  • the circuit 7 supplying carbonaceous material is only connected to the nitrogen source 31 and essentially comprises a flow regulator 11a as well as a blast airlock with a cellular metering device 40.
  • the airlock allows the flow rate of the mixture to be continuously varied. introduce and this by simply acting on the speed of rotation of the wheel of the cellular metering device 48. The flow rate of carrier gas passing through the blowing lance can thus be modified independently of the quantity of solid matter.
  • the airlock includes a conduit 41 leading to the pressurization system of the carbonaceous material reservoir 47, as well as conduits 42 to 46 connected to the fluidization system of the carbonaceous material.
  • a sensor 50 monitors the pressure in the conduits downstream of the airlock 40 and acts via the converter 49 and the computer 14b on the speed of rotation of the cellular metering device 48.
  • the flow regulator lIa of the circuit supplying carbonaceous material 7 is of a conception close to that of the regula 11 controlling the flow of sweeping gas and the elements performing equivalent functions are identified by the same numbers increased by the letter a. Note that the pressure prevailing in the duct is identified using the sensor 19a upstream of the pressure regulator 25a and the valves 24a and 26a and practically indicates the pressure of the nitrogen source 31.
  • the installation also includes several manometers 51 as well as electromagnetic valves 52.
  • valve 9 is closed and the valve 10 open and allows a small flow of gas (nitrogen, preferably argon) to flow through the shears 5 and the lance 1 so as to prevent clogging of the conduits due to an agglomeration of carbonaceous material deposited in the tubes or blockage of the lance head caused by projections.
  • gas nitrogen, preferably argon

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Discharge Heating (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Color Printing (AREA)
  • Endoscopes (AREA)
  • Luminescent Compositions (AREA)
  • Physical Vapour Deposition (AREA)
  • Glass Compositions (AREA)
  • Inorganic Insulating Materials (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

An apparatus and process for rapidly injecting or blowing solid combustible material into a metal pool is presented. In a preferred embodiment, the apparatus essentially comprises at least one nonoxidizing compressed gas source, a circuit which supplies granulated carbonaceous material suspended in a carrier gas, at least one circuit which supplies flushing gas, various means for metering different flow rates of the gas and solid particulate streams and means for separately or jointly connecting the above described circuits to appropriate conduits which terminate in a blowing lance.

Description

La présente invention concerne un systéme de réglage de' l'alimentation en matières solides d'une lance servant à approvisionner un bain de métal, notamment un bain de fonte en voie d'affinage. L'invention décrit en particulier un système, adapté à l'introduction de matière combustible granulée à l'aide de gaz porteurs neutres dans le métal en voie d'affinage dans le cadre des procédés LD, LD-AC ou LBE.The present invention relates to a system for adjusting the supply of solids to a lance used to supply a metal bath, in particular a cast iron bath in the process of refining. The invention describes in particular a system, suitable for the introduction of granulated combustible material using neutral carrier gases into the metal being refined in the context of the LD, LD-AC or LBE processes.

On connait des procédés qui prévoient de recarburer des bains de métal par addition de carbone par le haut. Ainsi la demande de brevet FR 2.459.835 prévoit de souffler sur la surface du bain du carbure de calcium, et ceci en utilisant l'oxygène d'affinage comme véhicule du carbure. Il s'avère que le carbure véhiculé par l'oxygène ne s'oxyde pas dans le jet, ce qui peut à priori surprendre. D'un autre c8té, les carbures sont des composés que l'on obtient par des réactions consommatrices de grandes quantités d'énergie ce qui devrait exclure un tel procédé à une époque où l'énergie est chère.Processes are known which plan to recarburize metal baths by adding carbon from above. Thus, patent application FR 2 459 835 provides for blowing calcium carbide on the surface of the bath, and this by using refining oxygen as the vehicle for the carbide. It turns out that the carbide carried by the oxygen does not oxidize in the jet, which may a priori surprise. On the other hand, carbides are compounds that are obtained by reactions consuming large amounts of energy which should exclude such a process at a time when energy is expensive.

Il serait par conséquent logique de prévoir l'utilisation de carbone sous forme d'anthracite, de poussier de coke ou autre matière carbonée appropriée. Or dans ce cas il est peu probable que l'on puisse opérer l'insufflation de la manière décrite dans la demande de brevet FR 2.459.835 sans qu'il y ait oxydation prématurée, éventuellement sous forme d'une combustion véhémente, destructrice de l'équipement. Il faut par conséquent injecter la matière carbonée à l'aide d'un gaz non comburant et prévoir éventuellement un écran protecteur gazeux entre le flux de matière carbonée et les jets avoisinnants d'oxygène d'affinage.It would therefore be logical to provide for the use of carbon in the form of anthracite, coke dust or other suitable carbonaceous material. In this case, it is unlikely that insufflation can be carried out in the manner described in patent application FR 2 459 835 without premature oxidation, possibly in the form of vehement combustion, destructive of equipment. It is therefore necessary to inject the carbonaceous material using of a non-oxidizing gas and possibly provide a gaseous protective screen between the flow of carbonaceous material and the neighboring jets of refining oxygen.

Les expériences des déposants ont montré que pour avoir une bonne absorption de la matière carbonée par le bain, il faut que celui-ci présente non seulement des concentrations d'oxygène et de carbone bien déterminées, mais qu'il faut en plus que la matière carbonée ait une énergie cinétique suffisante à la sortie de la lance pour pénétrer dans le bain. Cette énergie cinétique élevée, qui est également requise pour éviter une combustion prématurée de la matière carbonée au dessus du bain, est obtenue à l'aide d'un flux puissant de gaz. Etant donné que ce jet de gaz neutre exerce un effet refroidissant il est essentiel d'introduire la quantité requise de matière carbonée dans le bain dans un temps de soufflage aussi court que possible. Or un jet de gaz ayant une concentration en matières solides élevée crée des problèmes de bouchage des conduits d'amenée et de la tuyère de la lance.The experiments of the depositors have shown that in order to have a good absorption of the carbonaceous material by the bath, it is necessary that the latter not only present well-defined oxygen and carbon concentrations, but that in addition the material carbonaceous has sufficient kinetic energy at the outlet of the lance to enter the bath. This high kinetic energy, which is also required to avoid premature combustion of the carbonaceous material above the bath, is obtained using a powerful flow of gas. Since this neutral gas jet exerts a cooling effect, it is essential to introduce the required quantity of carbonaceous material into the bath in as short a blowing time as possible. However, a gas jet having a high solids concentration creates problems of clogging of the supply conduits and of the nozzle of the lance.

La contrainte de recarburer le bain en temps réduit est par ailleurs renforcée si on choisit pour des raisons de prix de revient l'azote comme gaz porteur. Le jet d'azote frappe en effet la surface du bain métallique au voisinage immédiat de l'oxygène d'affinage. Or il est bien connu que le degré de dissolution de l'azote dans l'acier liquide augmente avec la température.The constraint of recarburizing the bath in reduced time is also reinforced if nitrogen is chosen as the carrier gas for reasons of cost price. The nitrogen jet strikes the surface of the metal bath in the immediate vicinity of the refining oxygen. However, it is well known that the degree of dissolution of nitrogen in liquid steel increases with temperature.

L'invention a comme but de proposer un système capable d'injecter rapidement par en haut une quantité élevée de matière combustible granulée dans un bain de métal.The object of the invention is to propose a system capable of rapidly injecting a high quantity of granulated combustible material into a metal bath from above.

Ce but est atteint grâce au système de réglage selon l'invention qui comporte au moins une source de gaz comprimé, un circuit fournisseur de matière carbonée en suspension dans un gaz, au moins un circuit fournisseur de gaz de balayage, des moyens de dosage des différents débits de gaz et de matière carbonée et des moyens pour brancher séparément ou conjointement lesdits circuits sur un conduit aboutissant à la lance. Des formes d'exécution préférentielles de l'invention sont décrites dans les sous-revendications.This object is achieved thanks to the adjustment system according to the invention which comprises at least one source of compressed gas, a circuit supplying carbonaceous material suspended in a gas, at least one circuit supplying sweeping gas, means for metering the different gas and carbonaceous material flow rates and means for separately or jointly connecting said circuits to a conduit leading to the lance. Preferred embodiments of the invention are described in the subclaims.

D'autres caractéristiques et avantages ressortiront de la description du schema de principe représenté en Fig.l qui montre une forme d'exécution possible du système de réglage de l'alimentation de la lance.Other characteristics and advantages will emerge from the description of the schematic diagram shown in FIG. 1 which shows a possible embodiment of the system for adjusting the supply of the lance.

On distingue la lance d'insufflation 1 qui peut être une lance multiflux servant à alimenter le bain conjointement en oxygène et en matière granulée, comme décrit par exemple dans la demande de brevet LU 84.176, ou bien une lance monoflux servant à injecter uniquement de la matière granulée dans le bain. Dans ce dernier cas l'oxygène d'affinage et éventuellement l'oxygène de post-combustion est fourni par une lance séparée. La lance 1 est montée sur un système de fixation rapide 2, solidaire d'un chariot ou de tout autre système mobile, non représenté, servant à approcher la lance à la distance voulue de la surface du bain. Le système de fixation est relié à un ensemble 5 de tubes rigides 3 et d'articulations 4, connu sous le nom de cisaille ainsi qu'à un dispositif de sécurité 6 qui détecte d'éventuelles fuites dans le corps de la lance 1. La détection de fuites est particulièrement importante dans les lances multiflux qui fournissent conjointement le combustible qui est normalement abrasif et le comburant et peut par exemple être réalisée à l'aide d'une gaine remplie d'un fluide, qui entoure le conduit de matière carbonée dans la lance et d'un capteur de pression qui surveille la pression du fluide. En cas de rupture le capteur enregistre une variati- on de pression qu'il transmet au dispositif de sécurité 6 qui arrête l'opération de soufflage. On peut également concevoir un circuit de refroidissement de façon à réaliser en même temps une séparation entre les conduits de combustible et de comburant, comme décrit dans la demande de brevet LU (A 733). Une surveillance de la pression du circuit de refroidissement permet dans ce cas également une détection des fuites.We distinguish the insufflation lance 1 which can be a multiflux lance used to supply the bath jointly with oxygen and granulated material, as described for example in patent application LU 84.176, or else a monoflux lance used to inject only granulated material in the bath. In the latter case, the refining oxygen and possibly the post-combustion oxygen is supplied by a separate lance. The lance 1 is mounted on a quick fixing system 2, integral with a carriage or any other mobile system, not shown, used to approach the lance at the desired distance from the surface of the bath. The fastening system is connected to a set 5 of rigid tubes 3 and articulations 4, known as shears as well as to a safety device 6 which detects possible leaks in the body of the lance 1. The leak detection is particularly important in multiflow lances which jointly supply the fuel which is normally abrasive and the oxidizer and can for example be carried out using a sheath filled with a fluid, which surrounds the duct of carbonaceous material the lance and a pressure sensor which monitors the fluid pressure. In case of breaking the sensor records a Variati - one pressure it transmits to the safety device 6 which stops the blowing operation. One can also design a cooling circuit so as to achieve at the same time a separation between the fuel and oxidizer conduits, as described in patent application LU (A 733). In this case, monitoring of the cooling circuit pressure also allows leak detection.

La cisaille 5 peut être branchée à volonté sur le circuit 7 fournisseur de matière carbonée ou sur le circuit 8 fournisseur de gaz de balayage en agissant sur les vannes électromagnétiques 9 respectivement 10.The shears 5 can be connected at will to the circuit 7 supplying carbonaceous material or to the circuit 8 supplying sweep gas by acting on the respective electromagnetic valves 9 ment 10.

Le circuit-8 sert à envoyer un débit déterminé d'argon en provenance de la source 30 ou d'azote en provenance de la source 31 sur la lance 1 en ouvrant/fermant les vannes 21 resp. 22 et en contrôlant de façon adéquate le régulateur de débit 11. Le régulateur 11 se compose essentiellement d'un capteur de pression 19, d'un capteur de variation de pression 18 et d'un capteur de température 20 reliés respectivement à des convertisseurs 17, 16 et 15 qui transforment les signaux captés en signaux électriques traitables par le calculateur 14. Celui-ci détermine en fonction du régime de fonctionnement du creuset ou de l'état de bouchage des conduits le débit requis qu'il transmet à la vanne régulatrice 12 par l'intermédiaire de l'amplificateur 13. Notons que pour des raisons de clarté de la figure calculateur a été dessiné en plusieurs endroits différents (muni des références l4a et 14b). Entre la vanne 22 et la source d'azote 31 sont situés les vannes 24 et 26 ainsi qu'un régulateur de pression 25 qui évite que la source 31 n'applique des pressions. excessives au circuit fournisseur de gaz de balayage 8. Une valve unidirectionnelle 53 évite toute rétroaction du circuit fournisseur de matière carbonée 7 sur le circuit fournisseur de gaz de balayage 8.The circuit-8 is used to send a determined flow of argon from the source 30 or nitrogen from the source 31 to the lance 1 by opening / closing the valves 21 resp. 22 and by adequately controlling the flow regulator 11. The regulator 11 essentially consists of a pressure sensor 19, a pressure variation sensor 18 and a temperature sensor 20 connected respectively to converters 17 , 16 and 15 which transform the signals picked up into electrical signals that can be processed by the computer 14. The latter determines, depending on the operating mode of the crucible or the state of blockage of the conduits, the required flow rate which it transmits to the regulating valve 12 by means of the amplifier 13. Note that for reasons of clarity, the calculator figure has been drawn in several different places (provided with the references 14a and 14b). Between the valve 22 and the nitrogen source 31 are located the valves 24 and 26 as well as a pressure regulator 25 which prevents the source 31 from applying pressures. excessive to the purge gas supply circuit 8. A one-way valve 53 prevents any feedback from the carbon material supply circuit 7 to the purge gas supply circuit 8.

Le circuit 7 fournisseur de matière carbonée est uniquement relié à la source d'azote 31 et comporte essentiellement un régulateur de débit 11a ainsi qu'un sas de soufflage à doseur alvéolaire 40. Le sas permet de régler en variation continue le débit du mélange à introduire et ceci en agissant simplement sur la vitesse de rotation de la roue du doseur alvéolaire 48. Le débit de gaz porteur passant par la lance de soufflage peut ainsi être modifié indépendamment de la quantité de matière solide. Le sas comporte un conduit 41 menant au système de pressurisation du réservoir de matière carbonée 47, ainsi que des conduits 42 à 46 reliés au système de fluidisation de la matière carbonée. Un capteur 50 surveille la pression dans les conduits en aval du sas 40 et agit par l'intermédiaire du convertisseur 49 et du calculateur 14b sur la vitesse de rotation du doseur alvéolaire 48. Le régulateur de débit lIa du circuit fournisseur de matiére carbonée 7 est d'une conception proche de celle du régulateur 11 contrôlant le flux de gaz de balayage et les éléments remplissant des fonctions équivalentes sont répérés par les mêmes chiffres augmentés de la lettre a. Notons que la pression régnant dans le conduit est répérée à l'aide du capteur 19a en amont du régulateur de pression 25a et des vannes 24a et 26a et indique pratiquement la pression de la source d'azote 31.The circuit 7 supplying carbonaceous material is only connected to the nitrogen source 31 and essentially comprises a flow regulator 11a as well as a blast airlock with a cellular metering device 40. The airlock allows the flow rate of the mixture to be continuously varied. introduce and this by simply acting on the speed of rotation of the wheel of the cellular metering device 48. The flow rate of carrier gas passing through the blowing lance can thus be modified independently of the quantity of solid matter. The airlock includes a conduit 41 leading to the pressurization system of the carbonaceous material reservoir 47, as well as conduits 42 to 46 connected to the fluidization system of the carbonaceous material. A sensor 50 monitors the pressure in the conduits downstream of the airlock 40 and acts via the converter 49 and the computer 14b on the speed of rotation of the cellular metering device 48. The flow regulator lIa of the circuit supplying carbonaceous material 7 is of a conception close to that of the regula 11 controlling the flow of sweeping gas and the elements performing equivalent functions are identified by the same numbers increased by the letter a. Note that the pressure prevailing in the duct is identified using the sensor 19a upstream of the pressure regulator 25a and the valves 24a and 26a and practically indicates the pressure of the nitrogen source 31.

Il est bien évident qu'au lieu d'un calculateur unique on peut également utiliser des calculateurs individuels, dans ce cas de préférence analogiques, pour les régulations de débit de gaz porteur de matière carbonée et de gaz de balayage et pour la régulation du doseur alvéolaire. Dans ce cas les amplificateurs 13 et 13a sont remplacés par des amplificateurs-régulateurs qui recoivent leur consigne du calculateur 14b qui contr8le alors la concentration de matière solide dans le gaz en agissant sur l'amplificateur-régulateur 13a et sur la vitesse de rotation de la roue du doseur. Le calculateur 14b est alors également relié à l'amplificateur-régulateur 13 pour doser le flux de gaz de balayage. Une coordination supplémentaire entre les différents éléments de l'installation pourra être assurée par un opérateur.It is obvious that instead of a single computer, individual computers, in this case preferably analog, can also be used for regulating the flow rate of carbonaceous matter and sweeping gas and for regulating the metering device. alveolar. In this case the amplifiers 13 and 13a are replaced by amplifier-regulators which receive their instruction from the computer 14b which then controls the concentration of solid matter in the gas by acting on the amplifier-regulator 13a and on the speed of rotation of the metering wheel. The computer 14b is then also connected to the amplifier-regulator 13 to measure the flow of sweeping gas. An additional coordination between the different elements of the installation can be ensured by an operator.

L'installation comporte en outre plusieurs manomètres 51 ainsi que des vannes électromagnétiques 52.The installation also includes several manometers 51 as well as electromagnetic valves 52.

Le fonctionnement du système est le suivant:

  • Lors de la phase de recarburation la vanne 9 est ouverte tandis que la vanne 10 est fermée. Le débit de gaz porteur ainsi que celui de matière carbonée sont réglés aux valeurs maximales compatibles avec les capacités de l'installation (source, conduites, sas etc.) et les exigences métallurgiques (capacité d'absorption du carbone par le bain etc.). Dès que les conduites accusent un début de bouchage, qui peut nattre dans les conduits situés en aval du sas de soufflage à doseur alvéolaire, la pression répérée par le capteur 50 augmente et le calculateur 14 commande une réduction de la vitesse de rotation de la roue du doseur 48 de sorte à diminuer la charge en matière solide dans le flux gazeux. Si ensuite la pression chute, la vitesse de rotation de la roue 48 est de nouveau augmentée. Dans le cas contraire une réduction supplémentaire de la vitesse de rotation est commandée. Lorsque des opérations successives de réduction de la vitesse de rotation de la roue 48 n'aboutissent pas au débouchage des conduits, le calculateur 14 commande l'arrêt du circuit 7, la fermeture de la vanne 9 et l'ouverture de la vanne 10. Ensuite la vanne régulatrice 12 est ouverte au maximum de sorte à envoyer selon l'ouverture ou la fermeture des vannes 21 et 22, de l'azote ou de l'argon sous pression élevée sur la cisaille 5 et la lance 1. Si le débouchage désiré s'opère, la pression mesurée par le capteur 50 chute et la recarburation peut reprendre.
The system works as follows:
  • During the recarburization phase, the valve 9 is open while the valve 10 is closed. The carrier gas flow rate as well as that of carbonaceous material are adjusted to the maximum values compatible with the capacities of the installation (source, conduits, airlock, etc.) and metallurgical requirements (capacity for absorbing carbon by the bath, etc.). . As soon as the pipes show a start of blockage, which can occur in the pipes located downstream of the blast airlock with a honeycomb metering device, the pressure detected by the sensor 50 increases and the computer 14 commands a reduction in the speed of rotation of the wheel. of the metering device 48 so as to reduce the load of solid material in the gas flow. If the pressure then drops, the speed of rotation of the wheel 48 is again increased. Otherwise, an additional reduction in rotation speed is ordered. When successive operations to reduce the speed of rotation of the wheel 48 do not result in the unblocking of the conduits, the computer 14 controls the stopping of the circuit 7, the closing of the valve 9 and the opening of the valve 10. Then the regulating valve 12 is opened to the maximum so as to send, depending on the opening or closing of the valves 21 and 22, nitrogen or argon under high pressure on the shears 5 and the lance 1. If the unblocking desired operation takes place, the pressure measured by the sensor 50 drops and recarburation can resume.

Entre deux opérations de recarburation la vanne 9 est fermée et la vanne 10 ouverte et permet à un faible flux de gaz (azote, de préfé- férence argon) de circuler à travers la cisaille 5 et la lance 1 de façon à empêcher un bouchage des conduits dû à une agglomération de matière carbonée déposée dans les tubes ou un bouchage de la tête de lance provoqué par des projections.Between two recarburization operations the valve 9 is closed and the valve 10 open and allows a small flow of gas (nitrogen, preferably argon) to flow through the shears 5 and the lance 1 so as to prevent clogging of the conduits due to an agglomeration of carbonaceous material deposited in the tubes or blockage of the lance head caused by projections.

Le fonctionnement du système a été expliqué en utilisant des sources d'argon ou d'azote. Il est bien évident que l'on peut envisager l'utilisation de n'importe quel gaz compatible avec les contraintes d'ordre chimique c.à d. tout gaz non-oxydant, ce qui n'exclut pas l'utilisation de gaz de recyclage. De même, les opérations de débouchage des conduits ont été décrites en ouvrant respectivement fermant les valves électromagnétiques 9 et 10. On peut également ouvrir conjointement les vannes 9 et 10 et ajuster les différents débits de matière gazeuse et solide de sorte a aboutir au débouchage désiré. On peut aussi sans sortir du cadre de l'invention envisager de commander la valve électromagnétique 10 par impulsions. Dans ce dernier cas il faut choisir la fréquence ainsi que les temps de montée des signaux commandant l'ouverture/fermeture de la valve 10 de manière a éviter la création de vibrations dans les conduits ou l'apparition de pressions excessives,destructrices du matériel.The operation of the system has been explained using sources of argon or nitrogen. It is quite obvious that one can envisage the use of any gas compatible with the constraints of a chemical order ie. any non-oxidizing gas, which does not exclude the use of recycling gas. Similarly, the operations of unclogging the conduits have been described by opening respectively closing the electromagnetic valves 9 and 10. It is also possible to jointly open the valves 9 and 10 and adjust the different flow rates of gaseous and solid material so as to result in the desired unclogging . Without departing from the scope of the invention, it is also possible to envisage controlling the electromagnetic valve 10 by pulses. In the latter case, it is necessary to choose the frequency as well as the rise times of the signals controlling the opening / closing of the valve 10 so as to avoid the creation of vibrations in the conduits or the appearance of excessive pressures, destructive of the material.

Claims (8)

1. Système de réglage de l'alimentation en matières solides d'une lance de soufflage servant à approvisionner un bain de métal, notamment bain de fonte en voie d'affinage, caractérisé en ce qu'il comporte au moins une source de gaz comprimé, un circuit fournisseur de matière carbonée en suspension dans un gaz, au moins un circuit fournisseur de gaz de balayage, des moyens de dosage des différents débits de gaz et de matière carbonée et des moyens pour brancher séparément ou conjointement les dits circuits sur un conduit aboutissant à la lance.1. System for adjusting the supply of solids to a blowing lance used to supply a metal bath, in particular a cast iron bath in the process of refining, characterized in that it comprises at least one source of compressed gas , a circuit for supplying carbonaceous material suspended in a gas, at least one circuit for supplying sweeping gas, means for metering the different flow rates of gas and carbonaceous material and means for connecting said circuits separately or jointly on a conduit leading to the spear. 2. Système selon la revendication 1, caractérisé en ce que le circuit fournisseur de matière carbonée en suspension dans un gaz est relié à une des dites sources de gaz et comporte un système doseur du débit du gaz suivi d'un sas de soufflage à doseur alvéolaire.2. System according to claim 1, characterized in that the circuit supplying carbonaceous material suspended in a gas is connected to one of said gas sources and comprises a system for metering the gas flow followed by a blast airlock alveolar. 3. Système selon la revendication 2, caractérisé en ce que la vitesse de rotation de la roue à cellules du doseur alvéolaire est fonction de la pression régnant dans le conduit situé en aval du sas de soufflage à doseur alvéolaire.3. System according to claim 2, characterized in that the speed of rotation of the cell wheel of the cellular metering device is a function of the pressure prevailing in the duct located downstream of the blowing airlock with cellular metering device. 4. Système selon la revendication 1, caractérisé en ce que le/les circuits fournisseurs de gaz de balayage sont reliés à une/des sources de gaz sous pression et comportent un système doseur du débit du gaz constitué par une vanne régulatrice de débit, des capteurs pour mesurer la température, la pression et la variation de la pression du gaz.4. System according to claim 1, characterized in that the / the purging gas supplier circuits are connected to one / sources of gas under pressure and comprise a gas flow metering system constituted by a flow regulating valve, sensors to measure temperature, pressure and variation of gas pressure. 5. Système selon la revendication 4, caractérisé en ce qu'un calculateur commande le degré d'ouverture de la vanne régulatrice en fonction de la temperature, de la pression et de la variation de la pression du gaz ainsi que du régime de fonctionnement de l'installation.5. System according to claim 4, characterized in that a computer controls the degree of opening of the regulating valve as a function of the temperature, of the pressure and of the variation of the pressure of the gas as well as of the operating regime of the installation. 6. Système selon la revendication l, caractérisé en ce que les moyens pour brancher séparément ou conjointement les circuits fournisseurs de gaz et de matière carbonée en suspension dans un gaz sur le conduit aboutissant à la lance sont constitués par des vannes électromagnétiques, de préférence contrôlées par ordinateur.6. System according to claim l, characterized in that the means for separately or jointly connecting the gas and carbonaceous matter supply circuits suspended in a gas on the conduit leading to the lance are constituted by electromagnetic valves, preferably controlled by computer. 7. Système selon la revendication 1, caractérisé en ce que le conduit aboutissant à la lance est constitué par un système de tubes rigides et d'articulations.7. System according to claim 1, characterized in that the conduit leading to the lance is constituted by a system of rigid tubes and articulations. 8. Système selon la revendication 1, caractérisé en ce qu'il comporte des moyens pour détecter des fuites dans le corps de la lance ou dans la tête de lance et des moyens pour arrêter l'opération de soufflage en cas de fuite.8. System according to claim 1, characterized in that it comprises means for detecting leaks in the body of the lance or in the lance head and means for stopping the blowing operation in the event of a leak.
EP83630175A 1982-10-27 1983-10-20 Regulating system for delivering solid materials to a blowing lance Expired EP0110806B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83630175T ATE32351T1 (en) 1982-10-27 1983-10-20 CONTROL SYSTEM FOR SUPPLYING A BLOWING LANCE WITH SOLID SUBSTANCES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU84444 1982-10-27
LU84444A LU84444A1 (en) 1982-10-27 1982-10-27 SYSTEM FOR ADJUSTING THE SOLID MATERIAL SUPPLY OF A BLOWER LANCE

Publications (2)

Publication Number Publication Date
EP0110806A1 true EP0110806A1 (en) 1984-06-13
EP0110806B1 EP0110806B1 (en) 1988-02-03

Family

ID=19729972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83630175A Expired EP0110806B1 (en) 1982-10-27 1983-10-20 Regulating system for delivering solid materials to a blowing lance

Country Status (16)

Country Link
US (1) US4519587A (en)
EP (1) EP0110806B1 (en)
JP (1) JPS59133315A (en)
KR (1) KR840006371A (en)
AT (1) ATE32351T1 (en)
AU (2) AU558520B2 (en)
BR (1) BR8305162A (en)
CA (1) CA1210833A (en)
DE (1) DE3375583D1 (en)
ES (1) ES8407570A1 (en)
FI (1) FI73463C (en)
IN (1) IN160933B (en)
LU (1) LU84444A1 (en)
NO (1) NO833910L (en)
PT (1) PT77554B (en)
ZA (1) ZA837907B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165198A2 (en) * 1984-05-15 1985-12-18 Arbed S.A. Lance for accelerating solid particles

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4747584A (en) * 1987-05-19 1988-05-31 Inland Steel Company Apparatus for injecting alloying ingredient into molten metal stream
US6976489B2 (en) * 2000-06-30 2005-12-20 Northgate Technologies, Inc. Method and apparatus for humidification and warming of air
AUPR817201A0 (en) * 2001-10-09 2001-11-01 Technological Resources Pty Limited Supplying solid feed materials for a direct smelting process
US6835229B2 (en) 2002-01-22 2004-12-28 Isg Technologies Inc. Method and apparatus for clearing a powder accumulation in a powder delivery tube
EP1652939B1 (en) * 2004-10-12 2011-02-16 Technological Resources Pty. Ltd. Supplying solid feed materials for a direct smelting process
US8211052B1 (en) 2006-07-13 2012-07-03 Lexion Medical Llc Charged hydrator
US8496412B2 (en) * 2006-12-15 2013-07-30 General Electric Company System and method for eliminating process gas leak in a solids delivery system
CN102803849A (en) * 2009-04-24 2012-11-28 Fl史密斯公司 A Burner
JP5585517B2 (en) * 2011-04-07 2014-09-10 新日鐵住金株式会社 Refining equipment for blowing powder into molten steel, leak detection method and program for powder blowing tank
JP6019565B2 (en) * 2011-11-16 2016-11-02 株式会社Ihi Fine powder fuel supply method for oxyfuel boiler and oxyfuel boiler system
CA2910743C (en) * 2013-05-06 2021-03-02 Technological Resources Pty. Limited A solids injection lance
CN112981036A (en) * 2019-12-17 2021-06-18 新疆八一钢铁股份有限公司 Method for rapidly treating blockage of charging hole of converter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT225213B (en) * 1960-05-27 1963-01-10 Oesterr Alpine Montan Method and device for introducing additives into carbonaceous iron baths
DE1608619B1 (en) * 1959-04-29 1969-09-11 Polysius Ag Device for feeding fine-grained or powdery substances by means of a carrier gas onto the surface of molten metal
FR2224546A1 (en) * 1973-04-04 1974-10-31 Krupp Gmbh
US4045213A (en) * 1974-11-28 1977-08-30 Creusot-Loire Method of injecting a powder containing carbon into a metal bath
FR2459835A1 (en) * 1979-06-27 1981-01-16 Sueddeutsche Kalkstickstoff Molten iron treatment in converter - using oxygen contg. calcium carbide, so increased amt. of scrap iron can be added
BE893659A (en) * 1982-06-25 1982-10-18 Centre Rech Metallurgique Top blown converter steel refining process - with fuel injection into oxygen jet

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891196A (en) * 1974-01-21 1975-06-24 Thyssen Niederrhein Ag Apparatus for treating a melt
US4264059A (en) * 1980-03-12 1981-04-28 Victor Benatar Condition responsive control means for use in discharging powdered reagent into a pool of molten metal
LU82336A1 (en) * 1980-04-04 1980-07-02 Wurth Anciens Ets Paul METHOD AND DEVICE FOR PRESSING AND FLUIDIZING A PULVERULENT MASS IN A DISTRIBUTION ENCLOSURE
US4286774A (en) * 1980-04-22 1981-09-01 Victor Benatar System for automatically injecting a measured quantity of powdered reagent into a pool of molten metal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1608619B1 (en) * 1959-04-29 1969-09-11 Polysius Ag Device for feeding fine-grained or powdery substances by means of a carrier gas onto the surface of molten metal
AT225213B (en) * 1960-05-27 1963-01-10 Oesterr Alpine Montan Method and device for introducing additives into carbonaceous iron baths
FR2224546A1 (en) * 1973-04-04 1974-10-31 Krupp Gmbh
US4045213A (en) * 1974-11-28 1977-08-30 Creusot-Loire Method of injecting a powder containing carbon into a metal bath
FR2459835A1 (en) * 1979-06-27 1981-01-16 Sueddeutsche Kalkstickstoff Molten iron treatment in converter - using oxygen contg. calcium carbide, so increased amt. of scrap iron can be added
BE893659A (en) * 1982-06-25 1982-10-18 Centre Rech Metallurgique Top blown converter steel refining process - with fuel injection into oxygen jet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165198A2 (en) * 1984-05-15 1985-12-18 Arbed S.A. Lance for accelerating solid particles
EP0165198A3 (en) * 1984-05-15 1987-03-18 Arbed S.A. Lance for accelerating solid particles

Also Published As

Publication number Publication date
ES526779A0 (en) 1984-09-16
JPS59133315A (en) 1984-07-31
DE3375583D1 (en) 1988-03-10
ATE32351T1 (en) 1988-02-15
FI73463B (en) 1987-06-30
AU558520B2 (en) 1987-01-29
FI833858A (en) 1984-04-28
CA1210833A (en) 1986-09-02
LU84444A1 (en) 1984-05-10
BR8305162A (en) 1984-05-02
ZA837907B (en) 1984-06-27
KR840006371A (en) 1984-11-29
US4519587A (en) 1985-05-28
FI833858A0 (en) 1983-10-21
PT77554A (en) 1983-11-01
IN160933B (en) 1987-08-15
NO833910L (en) 1984-04-30
FI73463C (en) 1987-10-09
EP0110806B1 (en) 1988-02-03
AU2081783A (en) 1984-05-03
PT77554B (en) 1986-03-12
AU2066783A (en) 1984-05-03
ES8407570A1 (en) 1984-09-16

Similar Documents

Publication Publication Date Title
EP0110806B1 (en) Regulating system for delivering solid materials to a blowing lance
RU2219247C2 (en) Method and multifunctional lance for production of melted metal (options)
US4456476A (en) Continuous steelmaking and casting
JP5551086B2 (en) Combined burner and lance for electric arc furnace
US3955965A (en) Refining metals
JP3249816B2 (en) Tip submerged injection with shrouded lance
JP3534407B2 (en) Waste treatment method
US4615511A (en) Continuous steelmaking and casting
CA1199504A (en) Process and device for refining molten metal containing coolant solids
US8420009B2 (en) Gas cupola for melting metal
EP0769125B1 (en) Process for melting a metal charge in a rotary kiln, and rotary kiln for implementing such process
JP2010159444A (en) Apparatus for preventing backflow in metallurgical lance having burner function
RU2598429C2 (en) Method and system for delivering gas and granular material for melting facility
US6187258B1 (en) Operating method and device for a shaft furnace
EP0134336A1 (en) Continuous steelmaking and casting
US3157492A (en) Injection of solid material into molten metal
CA1283297C (en) Device for injecting divided solids in a furnace, namely in a steel making blast furnace, and uses for said device
KR20030009458A (en) Method and installation for producing a metal melt
EP0543758B1 (en) Apparatus for reducing iron oxide materials in a circulating fluidized bed
EP0834049B1 (en) Method for melting a batch in an electric arc furnace
JPS61115655A (en) Method for adding low melting metal to molten steel
CA1057953A (en) Iron or steelmaking process
EP0536185B1 (en) Liquid steel bath reheating method
JPH0776345B2 (en) Spouted bed type fine powder solid fuel gasifier and its operating method
JPH0791574B2 (en) Raw material charging method and apparatus for melting and refining furnace

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19841203

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE FR GB IT NL SE

REF Corresponds to:

Ref document number: 32351

Country of ref document: AT

Date of ref document: 19880215

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: ING. C. GREGORJ S.P.A.

REF Corresponds to:

Ref document number: 3375583

Country of ref document: DE

Date of ref document: 19880310

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19910829

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19910916

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19910920

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19910927

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19911008

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19911015

Year of fee payment: 9

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19911031

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19921020

Ref country code: AT

Effective date: 19921020

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19921021

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19921031

BERE Be: lapsed

Owner name: S.A. ARBED

Effective date: 19921031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19930501

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19921020

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 83630175.4

Effective date: 19930510