WO1982003091A1 - Blast furnace injection of overheated reducing gases - Google Patents

Blast furnace injection of overheated reducing gases Download PDF

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Publication number
WO1982003091A1
WO1982003091A1 PCT/BE1982/000003 BE8200003W WO8203091A1 WO 1982003091 A1 WO1982003091 A1 WO 1982003091A1 BE 8200003 W BE8200003 W BE 8200003W WO 8203091 A1 WO8203091 A1 WO 8203091A1
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Prior art keywords
reducing gases
gases
injected
solid fuel
blast furnace
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PCT/BE1982/000003
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French (fr)
Inventor
Rech Metallurgique Centre
Original Assignee
Poos Arthur Gerard
Ponghis Nikolas Gerassimos
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Application filed by Poos Arthur Gerard, Ponghis Nikolas Gerassimos filed Critical Poos Arthur Gerard
Priority to BR8206887A priority Critical patent/BR8206887A/en
Publication of WO1982003091A1 publication Critical patent/WO1982003091A1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/002—Heated electrically (plasma)
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents

Definitions

  • the present invention relates to a process for injecting into a blast furnace, superheated reducing gases which are produced from solid fuel.
  • the reducing gases are either produced in an independent unit and then superheated in a reactor which can advantageously be an electric machine of the plasma torch type having an arc heater, or produced directly in the said reactor where they are at the same time superheated to the required temperature.
  • a reactor which can advantageously be an electric machine of the plasma torch type having an arc heater, or produced directly in the said reactor where they are at the same time superheated to the required temperature.
  • These reducing gases can be produced from any solid, liquid, or gaseous fuel (hydrocarbon or carbonaceous material).
  • the object of the present invention is a method of implementing the process which has just been mentioned, applicable to the particular case where the reducing gases injected into the blast furnace are produced from solid fuel.
  • solid fuel is understood here to mean any material with a high carbon content, whether it be fossil materials ranging from anthracite to lignite and peat or residues from other industrial operations, such as pitch or petroleum coke for example.
  • this injection rate is often expressed in kg of material injected per tonne of pig iron.
  • the only definition that is correct from a technical and scientific point of view is to express it in grams of carbon injected per cubic meter of oxygen available to transform this carbon into CO.
  • the coal injected directly into the swirl zone can be considered as an injection cooling, that is to say that the gases produced by its combustion with the hot wind have a temperature much lower than that obtained by the combustion of the same hot wind with the coke superheated by its passage in the blast furnace before arriving in this swirl zone.
  • the cooling effect does not present any problem in the normal operation of the blast furnace and in certain cases, can even be beneficial.
  • this cooling action can be extremely annoying to the point of making normal operation of the furnace impossible.
  • the apparent signs of walking with an excessive cooling effect are constituted by a very high top temperature reflecting the poor walking of the. oven. It should be noted that the cooling action of a fuel is higher the higher its oxygen and water content (humidity or crystallization).
  • the technique proposed by the present invention makes it possible precisely to work with an extremely high consumption of solid fuel, up to the vicinity of the theoretical limit possible (525 grams of carbon per cubic meter of CO 2 or H 2 O, which corresponds to 1050 grams of carbon per cubic meter of O 2 ), while eliminating the difficulties or problems inherent in the technique of direct carbon injection, as described above.
  • the new technique proposed therefore has the advantage of being able to produce pig iron using, in a high proportion, solid fuels, without going through the coking stage and without causing the drawbacks of direct injection into the blast furnace.
  • this new technique makes it possible to take advantage of the advantages inherent in the process for injecting superheated reducing gases which has already been the subject of Belgian patents N ° 748.274; 767,897,770,094; 813.118.
  • the use of solid fuel with gasification according to the above-mentioned injection process leads to a significant increase in the productivity of the blast furnace.
  • the process, object of the present invention in which is injected at the main nozzles, reducing gases superheated at a temperature of 1500 to 2800 ° C, these gases containing mainly CO, O 2 and possibly N 2 , and lower amounts, CO 2 and H 2 O, is essentially characterized in that these reducing gases are obtained from a solid fuel, preferably dried and finely ground, injected in adequate proportions (O / carbon ratio) into a reactor where it is gasified in contact with an oxidizing agent such as air, super-oxygenated wind or again recycled gas containing a sufficient CO 2 content .
  • an oxidizing agent such as air, super-oxygenated wind or again recycled gas containing a sufficient CO 2 content
  • a material is used whose particle size is in the range from 60 to 100% of dimension less than 75 micrometers.
  • the additional heat necessary for obtaining superheated gases at a temperature between 1500 and 2800 ° C as required by the application of the method is advantageously provided, according to the invention, by electric means using '' an arc heater or a plasma torch that is an integral part of the reactor.
  • Case C is similar to that of Case B, with an injection of 981 m 3 N / tf of reducing gases produced from 200kg / tf of coal. 739 m N / tf of air at 1250 ° C were consumed to which 39.4 m 3 N / tf of 0 2 were added, while reducing gases were produced also in a reactor comprising a plasma oven.
  • case B we obtain practically the same setting per mile of coke (248 kg / tf), a much lower gas flow temperature (121 ° C instead of 200 ° C) and a significantly improved productivity (181, 86 t / h) instead of 161.51 t / h).

Abstract

Overheated reducing gases are injected into the blast-furnace, at the main blast-pipes, at a temperature ranging from 1500 to 2800`C, produced from solid fuel, said gases containing essentially CO, H<u2>u, N<u2>u, CO<u2>u and H<u2>uO. These reducing gases are obtained from a solid fuel, preferably dried and finely ground, injected in adequate proportions (O/carbon ratio) in a reactor where it is gasified by contact with an oxidizing agent such as air, over oxygenated wind or recycled top gases having a sufficient CO<u2>u content. These reducing gases are preferably overheated by electric process, particularly in a plasma torch.

Description

Injection au haut fourneau de gaz réducteurs surchauffés. Injection into the blast furnace of superheated reducing gases.
La présente invention est relative à un procédé d'injection dans un haut fourneau, de gaz réducteurs surchauffés qui sont produits à partir de combustible solide.The present invention relates to a process for injecting into a blast furnace, superheated reducing gases which are produced from solid fuel.
Le demandeur a déjà préconisé et expérimenté un procédé dans lequel, pour remplacer les gaz produits au niveau des tuyères principales d'un haut fourneau par combustion du coke avec de l'air réchauffé appelé vent chaud, on injecte des gaz réducteurs dont la température est comprise entre 1500°C et 2800ºC.The applicant has already recommended and experimented with a process in which, to replace the gases produced at the level of the main nozzles of a blast furnace by combustion of coke with heated air called hot wind, reducing gases are injected whose temperature is between 1500 ° C and 2800ºC.
Dans ce procédé, les gaz réducteurs sont soit produits dans une unité indépendante et ensuite surchauffés dans un réacteur qui peut ètre avantageusement un engin électrique du type torche à plasma eu réchaur faur à arc, soit produits directement dans le dit réacteur où ils sont en même temps surchauffés à la température requise. Ces gaz réducteurs peuvent être produits à partir de n ' importe que l combustible (hydrocarbure ou matière carbonée) solide, liquide, ou gazeux.In this process, the reducing gases are either produced in an independent unit and then superheated in a reactor which can advantageously be an electric machine of the plasma torch type having an arc heater, or produced directly in the said reactor where they are at the same time superheated to the required temperature. These reducing gases can be produced from any solid, liquid, or gaseous fuel (hydrocarbon or carbonaceous material).
La présente invention a pour obj et une méthode de mise en oeuvre du procédé qui vient d ' être rappelé, applicable au cas particulier où les gaz réducteurs inj ectés dans le haut fourneau sont produits à partir de combustible solide.The object of the present invention is a method of implementing the process which has just been mentioned, applicable to the particular case where the reducing gases injected into the blast furnace are produced from solid fuel.
Il faut entendre ici par combustible solide, toute matière à haute teneur en carbone, que ce soit des matières fossiles allant de l' anthracite au lignite et à la tourbe ou encore des résidus provenant d ' autres opérations industrielles, tels que du brai ou du coke de pétrole par exemple.The term solid fuel is understood here to mean any material with a high carbon content, whether it be fossil materials ranging from anthracite to lignite and peat or residues from other industrial operations, such as pitch or petroleum coke for example.
La production de gaz réducteurs à partir de combustible solide, y compris les résidus carbonés, présente un attrait tout particulier dans la situation économique actuelle où les produits pétroliers et les gaz naturels ne permettent plus, que dans des cas très restreints, une utilisation rentable. C ' est pour cette raison que les sidérurgistes de nombreux pays se tournent à nouveau vers le charbon et il existe déjà dans différentes parties du monde des tentatives de remplacer une partie non négligeable de coke métallurgique par une inj ection directe de ces charbons aux tuyères du haut fourneau . L' expérience disponible à ce j our montre qu' une telle inj ection directe de charbon est possible sans qu ' il y ait perturbation de la marche normale du haut fourneau, à condition que la combustion ce ce charbon se fasse dans une large mesure dans la zone ce tourbillonnement qui se crée à l' intérieur du haut fourneau, juste devant les tuyères par lesquelles on inj ecte l ' air chaud (généralement dénommé v ent chaud) dest iné à la combustion du coke . Cep.endant, une telle injection de charbon ne se fait pas sans poser des problèmes particuliers dans le cas où on vise des taux d'injection élevés, c'est-à-dire des marches où la quantité de charbon injectée à la tonne de fonte est élevée.The production of reducing gases from solid fuel, including carbon residues, is particularly attractive in the current economic situation where petroleum products and natural gases only allow profitable use in very limited cases. It is for this reason that steelmakers in many countries are again turning to coal and there are already in different parts of the world attempts to replace a non-negligible part of metallurgical coke by a direct injection of these coals to the nozzles of the blast furnace . Experience available to date shows that such a direct injection of coal is possible without disturbing the normal operation of the blast furnace, provided that the combustion of this coal takes place to a large extent in the zone this swirling which is created inside the blast furnace, just in front of the nozzles through which the hot air (generally referred to as hot) is injected intended for the combustion of coke. However, such an injection of coal is not without posing particular problems in the case where high injection rates are targeted, i.e. markets where the quantity of coal injected per ton of cast iron is high.
Dans la pratique, ce taux d'injection est souvent exprimé en kg de matière insufflée par tonne de fonte. Toutefois, la seule définition correcte aux points de vue technique et scientifique consiste à l'exprimer en gramme de carbone injecté par mètre cube d'oxygène disponible pour transformer ce carbone en CO.In practice, this injection rate is often expressed in kg of material injected per tonne of pig iron. However, the only definition that is correct from a technical and scientific point of view is to express it in grams of carbon injected per cubic meter of oxygen available to transform this carbon into CO.
Un des problèmes posés par l'injection massive de charbon directement dans la zone de tourbillonnement devant les tuyères réside dans le fait que le temps de séjour du charbon dans cette zone ne dépasse guère le dixième de seconde et que dès lors, le temps disponible pour la combustion du charbon est extrêmement faible. De plus, le charbon injecté étant froid, il faut d'abord le porter au-delà de la températuré d'inflammation avant que la combustion ne puisse commencer. Par ailleurs, la vitesse de combustion du charbon est également fortement influencée par le potentiel en oxygène (découlant des teneurs en CO2 et O2 libres) du comburant. Or, comme les "parois" de la zone de tourbillonnement dans laquelle on injecte le charbon froid sont formées par du coke porté à haute température au cours de sa descente dans le haut fourneau, le charbon se trouve être en compétition avec ce coke surchauffé pour se procurer l'oxygène nécessaire à sa combustion; dans ces conditions, on comprend qu' il est difficile de dépasser, sans problèmes, des taux d' injection de l'ordre de 300 grammes de carbone par mètre cube d'oxygène, c'est-à-dire de l'ordre de 80 à 120 kg de charbon par tonne de fonte suivant les conditions de marche du haut fourneau.One of the problems posed by the massive injection of coal directly into the swirl zone in front of the nozzles resides in the fact that the residence time of the coal in this zone hardly exceeds one tenth of a second and that therefore the time available for coal combustion is extremely low. In addition, the carbon injected being cold, it must first be carried beyond the ignition temperature before combustion can begin. In addition, the rate of combustion of the coal is also strongly influenced by the oxygen potential (resulting from the free CO 2 and O 2 contents) of the oxidizer. However, as the "walls" of the swirl zone into which the cold coal is injected are formed by coke brought to high temperature during its descent into the blast furnace, the coal is found to be in competition with this superheated coke for obtain the oxygen necessary for its combustion; under these conditions, it is understood that it is difficult to exceed, without problems, injection rates of the order of 300 grams of carbon per cubic meter of oxygen, that is to say of the order of 80 to 120 kg of coal per ton of pig iron depending on the operating conditions of the blast furnace.
Par ailleurs, le charbon injecté directement dans la zone de tourbillonnement peut être considéré comme une injection refroidissante, c'est-à-dire que les gaz produits par sa combustion avec le vent chaud ont une température nettement inférieure à celle obtenue par la combustion du même vent chaud avec le coke surchauffé par son passage dans le haut fourneau avant d'arriver dans cette zone de tourbillonnement. Dans le cas d'une injection refroidissante à un taux modéré, l'effet refroidissant ne présente aucun problème dans la marche normale du haut fourneau et dans certains cas, peut même être bénéfique. Par contre, pour des taux d'injection très élevés et surtout pour certains types de combustible à effet très refroidissant, cette action de refroidissement peut être extrêmement gênante au point de rendre impossible une marche normale du fourneau. Les signes apparents d'une marche avec effet refroidissant excessif sont constitués par une température de gueulard très élevée traduisant la mauvaise marche du. four. Il est à noter que l'action refroidissante d'un combustible est d'autant plus élevée que sa teneu en oxygène et en eau (d'humidité ou de cristallisation) est élevée.Furthermore, the coal injected directly into the swirl zone can be considered as an injection cooling, that is to say that the gases produced by its combustion with the hot wind have a temperature much lower than that obtained by the combustion of the same hot wind with the coke superheated by its passage in the blast furnace before arriving in this swirl zone. In the case of a cooling injection at a moderate rate, the cooling effect does not present any problem in the normal operation of the blast furnace and in certain cases, can even be beneficial. On the other hand, for very high injection rates and especially for certain types of fuel with a very cooling effect, this cooling action can be extremely annoying to the point of making normal operation of the furnace impossible. The apparent signs of walking with an excessive cooling effect are constituted by a very high top temperature reflecting the poor walking of the. oven. It should be noted that the cooling action of a fuel is higher the higher its oxygen and water content (humidity or crystallization).
La technique proposée par la présente invention permet précisément de travailler avec une consommation de combustible solide extrêmement élevée, jusqu'au voisinage de la limite théorique possible (525 grammes de carbone par mètre cube de CO2 ou H2O, ce qui correspond à 1050 grammes de carbone par mètre cube d'O2), tout en éliminant les difficultés ou les problèmes inhérents à la technique d'injection directe de charbon, tels que décrits plus haut.The technique proposed by the present invention makes it possible precisely to work with an extremely high consumption of solid fuel, up to the vicinity of the theoretical limit possible (525 grams of carbon per cubic meter of CO 2 or H 2 O, which corresponds to 1050 grams of carbon per cubic meter of O 2 ), while eliminating the difficulties or problems inherent in the technique of direct carbon injection, as described above.
La nouvelle technique proposée présente donc l'avantage de pouvoir produire de la fonte en utilisant, dans une proportion élevée, des combustibles solides, sans passer par le stade de la cokéfaction et sans entraîner les inconvénients d'une injection directe dans le haut fourneau. De plus, cette nouvelle technique permet de profiter des avantages inhérents au procédé d'injection de gaz réducteurs surchauffés qui a déjà fait l'objet des brevets belges N° 748.274; 767.897, 770.094; 813.118. Enfin, on soulignera également que l'utilisation de combustible solide avec gazéification suivant le procédé d'injection ci-dessus rappelé conduit à une augmentation sensible de la productivité du haut fourneau.The new technique proposed therefore has the advantage of being able to produce pig iron using, in a high proportion, solid fuels, without going through the coking stage and without causing the drawbacks of direct injection into the blast furnace. In addition, this new technique makes it possible to take advantage of the advantages inherent in the process for injecting superheated reducing gases which has already been the subject of Belgian patents N ° 748.274; 767,897,770,094; 813.118. Finally, it will also be emphasized that the use of solid fuel with gasification according to the above-mentioned injection process leads to a significant increase in the productivity of the blast furnace.
Le procédé, objet de la présente invention, dans lequel on injecte au niveau des tuyères principales, des gaz réducteurs surchauffés à une température de 1500 à 2800°C, ces gaz contenant principalement du CO, du O2 et éventuellement N2, et en moindres quantités, du CO2 et du H2O, est essentiellement caractérisé en ce que ces gaz réducteurs sont obtenus à partir d'un combustible solide, de préférence séché et finement broyé, injecté en proportions adéquates (rapport O/carbone) dans un réacteur où il est gazéifié au contact d'un agent oxydant tel que air, vent suroxygéné ou encore gaz de gueulard recyclés contenant une teneur suffisante en CO2.The process, object of the present invention, in which is injected at the main nozzles, reducing gases superheated at a temperature of 1500 to 2800 ° C, these gases containing mainly CO, O 2 and possibly N 2 , and lower amounts, CO 2 and H 2 O, is essentially characterized in that these reducing gases are obtained from a solid fuel, preferably dried and finely ground, injected in adequate proportions (O / carbon ratio) into a reactor where it is gasified in contact with an oxidizing agent such as air, super-oxygenated wind or again recycled gas containing a sufficient CO 2 content .
Dans une variante avantageuse du procédé de l'invention, qui tient compte de ce que la granulométrie optimale du combustible utilisé varie légèrement suivant la nature et la réactivité du dit combustible, on utilise un matériau dont la granulométrie se situe dans la gamme de 60 à 100 % de dimension inférieure à 75 micromètres.In an advantageous variant of the process of the invention, which takes into account that the optimum particle size of the fuel used varies slightly depending on the nature and the reactivity of said fuel, a material is used whose particle size is in the range from 60 to 100% of dimension less than 75 micrometers.
La chaleur supplémentaire nécessaire à l'obtention de gaz surchauffés à une température comprise entre 1500 et 2800°C tel qu'il est requis par l'application du procédé est avantageusement assurée, suivant l'invention, par voie électrique à l'aide d'un réchauffeur à arc ou d'une torche à plasma faisant partie intégrante du réacteur.The additional heat necessary for obtaining superheated gases at a temperature between 1500 and 2800 ° C as required by the application of the method is advantageously provided, according to the invention, by electric means using '' an arc heater or a plasma torch that is an integral part of the reactor.
Par l'application de cette nouvelle technique, on obtient au nez de la tuyère des gaz réducteurs surchauffés ne contenant plus que les cendres du combustible et une partie relativement faible d' imbrûlés. Sa teneur résiduelle en H2O et CO2 est contrôlée de façon à brûler une quantité de coke bien déterminée (mise au mille), choisie sur base de considérations économiques et autres.By applying this new technique, superheated reducing gases are obtained at the nose of the nozzle, containing only the fuel ashes and a portion relatively weak unburnt. Its residual content of H 2 O and CO 2 is controlled so as to burn a well-determined quantity of coke (per thousand), chosen on the basis of economic and other considerations.
Pour bien mettre en évidence les avantages du procédé, objet de la présente invention, les exemples détaillés ci-dessous montrent les différences dans les caractéristiques techniques d'un haut fourneau, d'abord pour une marche de four classique avec injection directe de charbon (cas A) et ensuite pour une marche suivant le procédé avec injection de gaz réducteurs surchauffés produits à partir de charbon (cas B et C).To clearly highlight the advantages of the process which is the subject of the present invention, the examples detailed below show the differences in the technical characteristics of a blast furnace, first of all for a conventional oven operation with direct injection of coal ( case A) and then for a walk according to the process with injection of superheated reducing gases produced from coal (cases B and C).
Dans le cas A, on a injecté 100 kg/tf de charbon dans le haut fourneau directement à travers les tuyères principales. On a réalisé une mise au mille de coke de 372 kg/tf qui est nettement inférieure à celle d'une marche sans injection de charbon, une température de gaz de gueulard de 240°C et une productivité de 144, 13 t/h.In case A, 100 kg / tf of coal was injected into the blast furnace directly through the main nozzles. A coke setting of 372 kg / tf was achieved, which is much lower than that of a step without injection of coal, a top gas temperature of 240 ° C and a productivity of 144, 13 t / h.
Dans le cas B, on a inj ecté 1124 m N/tf de gaz réducteurs pro duits à partir de 200 kg/tf de charbon, soit le double du cas A. On a consommé 918 m 3 N/tf d ' air normal à 1250°C pour produ ire ces . gaz réducteurs dans un réacteur comprenant un four à plasma . On a obtenu une mise au mille de coke de 247 kg/tf nettement inférieure à celle du cas A ( 372 kg/t f) . De même, la température du gaz de gueulard ( 200° C) est notablement inférieure à celle du cas A ( 240°C) . La productivité du fournea a été de 161, 51 t/h . c ' est-à-dire bien supérieure à celle du cas B ( 144, 13 t/h) .In case B, 1124 m N / tf of reducing gases produced from 200 kg / tf of coal were injected, double the case of Case A. 918 m 3 N / tf of normal air was consumed at 1250 ° C to produce these. reducing gases in a reactor comprising a plasma furnace. A coke setting of 247 kg / tf was obtained considerably lower than that in case A (372 kg / tf). Likewise, the temperature of the top gas (200 ° C) is significantly lower than that of case A (240 ° C). The productivity of the furnace was 161.51 t / h. that is to say much higher than that of case B (144, 13 t / h).
Le cas C est similaire à celui du cas B, avec une inj ect ion de 981 m3 N/t f de gaz réducteurs produits à partir de 200kg/ t f de charbon . On a consommé 739 m N/t f d ' air à 1250°C auquel on a aj outé 39 , 4 m3N/t f d ' 02 cour produ ire les gaz réducteurs également dans un réacteur comprenant un four à plasma. Par rapport au cas B, on obtient pratiquement la même mise au mille de coke (248 kg/tf) , une température de gaz de gueulard nettement inférieure (121°C au lieu de 200°C) et une productivité sensiblement améliorée (181,86 t/h) au lieu de 161,51 t/h) . Case C is similar to that of Case B, with an injection of 981 m 3 N / tf of reducing gases produced from 200kg / tf of coal. 739 m N / tf of air at 1250 ° C were consumed to which 39.4 m 3 N / tf of 0 2 were added, while reducing gases were produced also in a reactor comprising a plasma oven. Compared to case B, we obtain practically the same setting per mile of coke (248 kg / tf), a much lower gas flow temperature (121 ° C instead of 200 ° C) and a significantly improved productivity (181, 86 t / h) instead of 161.51 t / h).
Figure imgf000010_0001
Figure imgf000010_0001

Claims

Revendications de brevet. Patent claims.
1. Procédé d'injection au haut fourneau de gaz réducteurs surchauffés produits à partir de -combustible solide, dans lequel on injecte, au niveau des tuyères principales, des gaz réducteurs surchauffés à une température de 1500 à 2800°C, ces gaz contenant principalement du CO, du H2 et éventuellement N2, et en moindres quantités du CO2 et du H2O, caractérisé en ce que ces gaz réducteurs sont obtenus à partir d'un combustible solide, de préférence séché et finement broyé, injecté en proportions adéquates (rapport 0/carbone) dans un réacteur où il est gazéifié au contact d'un agent oxydant tel que air, vent suroxygéné ou encore gaz de gueulard recyclés contenant une teneur suffisante en CO- •1. Process for injecting superheated reducing gases produced from solid fuel into the blast furnace, into which superheated reducing gases are injected, at the level of the main nozzles, at a temperature of 1500 to 2800 ° C., these gases mainly containing CO, H 2 and possibly N 2 , and in smaller quantities of CO 2 and H 2 O, characterized in that these reducing gases are obtained from a solid fuel, preferably dried and finely ground, injected in adequate proportions (0 / carbon ratio) in a reactor where it is gasified in contact with an oxidizing agent such as air, super-oxygenated wind or even recycled gas containing a sufficient CO- • content
2. Procédé suivant la revend ication 1, caractérisé en ce qu ' on utilise un matériau dont la granulométrie se situe2. Method according to resell ication 1, characterized in that a material is used whose particle size is
' dans la gamme de 60 à 100 % de dimension inférieure à 75 micromètres .'' in the range of 60 to 100% of dimension less than 75 micrometers.
3 . Procédé suivant l ' une ou l ' autre des revendications 1 et 2 , caractérisé en ce que la chaleur supplémentaire nécessaire à l ' obtention de gaz surchauffés à une température comprise entre 1500 et 2800° C est assurée par voie électrique, à l ' aide d 'un réchauffeur à arc ou d ' une torche à plasma faisant partie intégrante du réacteur .3. Process according to either of Claims 1 and 2, characterized in that the additional heat necessary for obtaining gases superheated at a temperature between 1500 and 2800 ° C is provided electrically, using an arc heater or a plasma torch which is an integral part of the reactor.
4. Procédé su ivant l' une ou l ' autre des revendications 1 à 3, caractérisé en ce que le combust ib le solide est de préférence du charbon . 4. A process following one or the other of claims 1 to 3, characterized in that the solid fuel ib is preferably carbon.
PCT/BE1982/000003 1981-03-11 1982-03-04 Blast furnace injection of overheated reducing gases WO1982003091A1 (en)

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BR8206887A BR8206887A (en) 1981-03-11 1982-03-04 INJECTION IN HIGH OVEN OF OVERHEATED REDUCING GASES

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BE47416810311 1981-03-11
BE6/47416A BE887904A (en) 1981-03-11 1981-03-11 PROCESS FOR INJECTION IN THE TOP GAS STOVE, OVERHEATED REDUCERS PRODUCED FROM SOLID FUEL

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* Cited by examiner, † Cited by third party
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EP0319505A1 (en) * 1987-12-03 1989-06-07 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method of ore reduction in a shaft furnace
EP0931840A1 (en) * 1998-01-23 1999-07-28 Sms Schloemann-Siemag Aktiengesellschaft Process and installation for iron ore reduction in blast furnaces

Families Citing this family (2)

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LU85585A1 (en) * 1983-10-12 1985-04-02 Centre Rech Metallurgique PROCESS FOR INJECTING REDUCING GAS IN THE BLAST FURNACE
CN101871026A (en) * 2010-06-12 2010-10-27 郑州豫兴耐火材料有限公司 Method for injecting carbon dioxide into blast furnace

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US1831254A (en) * 1927-04-19 1931-11-10 American Radiator Co Method for furnace treatment of metal and metalliferous material
FR1397363A (en) * 1964-03-17 1965-04-30 Steinmueller Gmbh L & C Method and device for the production and delivery of reducing products to a metallurgical installation
FR2223449A1 (en) * 1973-03-26 1974-10-25 Skf Ind Trading & Dev Reduction gas for metallurgical processes - made by passing recycle gas with carbon and/or hydrocarbons through a gas plasma to raise temp.
BE833049A (en) * 1975-09-03 1976-03-03 PROCEDURE FOR USING GUEULARD GAS FROM HIGH RANGE
US4153426A (en) * 1977-07-18 1979-05-08 Arthur G. Mckee & Company Synthetic gas production
BE883667A (en) * 1980-06-05 1980-12-05 Centre Rech Metallurgique PROCEDE DE CONDUITE D'UN FOUR A CUVE
EP0021601A1 (en) * 1979-05-25 1981-01-07 Westinghouse Electric Corporation Process for regenerating a reducing gas mixture from spent gas evolved in the production of sponge iron

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US1831254A (en) * 1927-04-19 1931-11-10 American Radiator Co Method for furnace treatment of metal and metalliferous material
FR1397363A (en) * 1964-03-17 1965-04-30 Steinmueller Gmbh L & C Method and device for the production and delivery of reducing products to a metallurgical installation
FR2223449A1 (en) * 1973-03-26 1974-10-25 Skf Ind Trading & Dev Reduction gas for metallurgical processes - made by passing recycle gas with carbon and/or hydrocarbons through a gas plasma to raise temp.
BE833049A (en) * 1975-09-03 1976-03-03 PROCEDURE FOR USING GUEULARD GAS FROM HIGH RANGE
US4153426A (en) * 1977-07-18 1979-05-08 Arthur G. Mckee & Company Synthetic gas production
EP0021601A1 (en) * 1979-05-25 1981-01-07 Westinghouse Electric Corporation Process for regenerating a reducing gas mixture from spent gas evolved in the production of sponge iron
BE883667A (en) * 1980-06-05 1980-12-05 Centre Rech Metallurgique PROCEDE DE CONDUITE D'UN FOUR A CUVE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0319505A1 (en) * 1987-12-03 1989-06-07 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Method of ore reduction in a shaft furnace
EP0931840A1 (en) * 1998-01-23 1999-07-28 Sms Schloemann-Siemag Aktiengesellschaft Process and installation for iron ore reduction in blast furnaces

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JPS58500412A (en) 1983-03-17
ES8302785A1 (en) 1983-01-16
BE887904A (en) 1981-09-11
ES510284A0 (en) 1983-01-16
AU8271682A (en) 1982-09-28
BR8206887A (en) 1983-03-01
EP0073793A1 (en) 1983-03-16
ZA821604B (en) 1983-01-26
CA1185434A (en) 1985-04-16

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