BE1008143A6 - Method for injecting a pulverulent solid fuel into a tank furnace - Google Patents

Method for injecting a pulverulent solid fuel into a tank furnace Download PDF

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Publication number
BE1008143A6
BE1008143A6 BE9400261A BE9400261A BE1008143A6 BE 1008143 A6 BE1008143 A6 BE 1008143A6 BE 9400261 A BE9400261 A BE 9400261A BE 9400261 A BE9400261 A BE 9400261A BE 1008143 A6 BE1008143 A6 BE 1008143A6
Authority
BE
Belgium
Prior art keywords
solid fuel
injecting
current
injection
pulverulent solid
Prior art date
Application number
BE9400261A
Other languages
French (fr)
Inventor
Pascal Dufresne
Rene Munnix
Gerard Danloy
Original Assignee
Centre Rech Metallurgique
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 Centre Rech Metallurgique filed Critical Centre Rech Metallurgique
Priority to BE9400261A priority Critical patent/BE1008143A6/en
Application granted granted Critical
Publication of BE1008143A6 publication Critical patent/BE1008143A6/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/001Injecting additional fuel or reducing agents
    • C21B5/003Injection of pulverulent coal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00Shaft or like vertical or substantially vertical furnaces
    • F27B1/10Details, accessories, or equipment peculiar to furnaces of these types
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00Charging; Discharging; Manipulation of charge
    • F27D3/18Charging particulate material using a fluid carrier

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Iron (AREA)

Abstract

At least one part of the pulverulent solid fuel is injected in the oppositedirection into the hot air stream to be blown into the tank furnace. Theinjection may be directed axially or transversely towards the upstream of thehot air stream. It may be combined with a conventional injection in thedirection of the hot air stream. Application to the injection of pulverisedcoal in a blast furnace.

Description

       

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  Procédé pour l'injection d'un combustible solide   pulvérulent   dans un four à cuve. 



  La présente invention concerne un procédé pour l'injection d'un combustible solide pulvérulent dans un four à cuve, en particulier de charbon pulvérisé dans un haut-fourneau. 



  Dans la description qui suit, l'invention sera exposée en se référant plus spécialement, à titre de simple exemple toutefois, à l'injection de charbon pulvérisé dans un haut-fourneau. 



  On sait que le prix du coke intervient pour une part de plus en plus grande dans le prix de revient de la fonte produite au haut-fourneau, notamment en raison du renchérissement des charbons cokéfiables. Depuis plusieurs années, on cherche à remplacer au moins partiellement ce coke par des combustibles auxiliaires, moins chers, que l'on injecte en particulier dans le courant de vent chaud, riche en oxygène, circulant dans les tuyères du haut-fourneau. A l'heure actuelle, le charbon pulvérulent est le combustible auxiliaire qui présente le plus grand intérêt économique dans l'optique de son injection au haut-fourneau. 



  Conventionnellement, le charbon pulvérulent est injecté dans le courant de vent chaud au moyen d'une lance introduite obliquement dans la tuyère. 



  Le charbon pulvérisé est ainsi injecté dans le sens de circulation du vent chaud, afin de profiter de l'effet d'entraînement créé par ce courant circulant à grande vitesse. 



  La possibilité d'injecter du charbon pulvérisé dans un haut-fourneau se heurte cependant actuellement à une limite physique de l'ordre de 200 kg de charbon par tonne de fonte. Cette limite résulte notamment de l'impossibilité d'enflammer et de brûler des quantités plus élevées de charbon dans les conditions actuelles d'injection. 

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 La présente invention a pour objectif d'améliorer ces conditions d'injection en proposant un procédé qui assure une meilleure dispersion du combustible solide pulvérulent dans le courant de vent chaud et qui, en même temps, améliore les conditions mêmes de la combustion du combustible solide pulvérulent. 



  Conformément à la présente invention, un procédé pour l'injection d'un combustible solide pulvérulent dans un four à cuve, dans lequel on injecte ledit combustible solide pulvérulent dans un courant de vent chaud à insuffler dans ledit four à cuve, est caractérisé en ce que l'on injecte au moins une partie dudit combustible solide pulvérulent à contre-courant dans ledit courant de vent chaud. 



  Suivant une mise en oeuvre particulière, cette injection à contre-courant peut être couplée avec une injection conventionnelle de combustible solide pulvérulent dans le sens dudit courant de vent chaud. 



  Par rapport à une telle injection conventionnelle, l'injection à contrecourant proposée par l'invention présente plusieurs avantages techniques intéressants. Il convient de préciser ici qu'au sens de la présente invention, une injection à contre-courant comprend également une injection dirigée obliquement vers l'amont du courant de vent chaud. 



  En premier lieu, elle assure, par un effet purement mécanique, un éclatement plus rapide et une meilleure dispersion du jet de combustible solide pulvérulent dans le courant de vent chaud. De plus, l'injection à contre-courant assure un temps de séjour plus long du combustible dans le vent chaud, puisque ce combustible présente initialement une vitesse en sens contraire, qui doit s'annuler avant de s'inverser pour accompagner le vent chaud. 



  Ces conditions sont de nature à favoriser la combustion et permettent d'augmenter la quantité de combustible solide pulvérulent injectée dans un four à cuve.



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  Method for injecting a pulverulent solid fuel into a shaft furnace.



  The present invention relates to a method for injecting a pulverulent solid fuel into a shaft furnace, in particular pulverized coal into a blast furnace.



  In the description which follows, the invention will be explained with more specific reference, by way of simple example, however, to the injection of pulverized coal into a blast furnace.



  We know that the price of coke plays an increasingly large part in the cost price of pig iron produced in the blast furnace, in particular due to the higher cost of coking coals. For several years, it has been sought to at least partially replace this coke with cheaper auxiliary fuels, which are injected in particular into the stream of hot oxygen-rich wind flowing in the blast furnace nozzles. At present, pulverulent coal is the auxiliary fuel which is of greatest economic interest from the point of view of its injection into the blast furnace.



  Conventionally, pulverulent coal is injected into the current of hot wind by means of a lance introduced obliquely into the nozzle.



  The pulverized coal is thus injected in the direction of circulation of the hot wind, in order to take advantage of the ripple effect created by this current circulating at high speed.



  However, the possibility of injecting pulverized coal into a blast furnace currently encounters a physical limit of the order of 200 kg of coal per tonne of pig iron. This limit results in particular from the impossibility of igniting and burning higher quantities of coal under the current injection conditions.

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 The object of the present invention is to improve these injection conditions by proposing a method which ensures better dispersion of the pulverulent solid fuel in the current of hot wind and which, at the same time, improves the very conditions of combustion of the solid fuel. powdery.



  According to the present invention, a method for injecting a solid powdery fuel into a shaft furnace, in which said solid powdery fuel is injected into a stream of hot wind to be blown into said shaft furnace, is characterized in that that at least part of said pulverulent solid fuel is injected against the current in said hot wind current.



  According to a particular implementation, this counter-current injection can be coupled with a conventional injection of pulverulent solid fuel in the direction of said hot wind current.



  Compared to such a conventional injection, the countercurrent injection proposed by the invention has several interesting technical advantages. It should be specified here that for the purposes of the present invention, a counter-current injection also includes an injection directed obliquely upstream of the hot wind current.



  Firstly, it ensures, by a purely mechanical effect, a faster bursting and a better dispersion of the pulverulent solid fuel jet in the current of hot wind. In addition, the counter-current injection ensures a longer residence time of the fuel in the hot wind, since this fuel initially has a speed in the opposite direction, which must cancel before reversing to accompany the hot wind. .



  These conditions are likely to promote combustion and make it possible to increase the quantity of pulverulent solid fuel injected into a shaft furnace.


    

Claims (2)

REVENDICATIONS 1. Procédé pour l'injection d'un combustible solide pulvérulent dans un four à cuve, dans lequel on injecte ledit combustible solide pulvéru- lent dans un courant de vent chaud à insuffler dans ledit four à cuve, caractérisé en ce que l'on injecte au moins une partie dudit combus- tible solide pulvérulent à contre-courant dans ledit courant de vent chaud. CLAIMS 1. Method for injecting a solid powdery fuel into a shaft furnace, in which said solid powdery fuel is injected into a current of hot wind to be blown into said shaft furnace, characterized in that injecting at least a portion of said solid pulverulent fuel against the current in said stream of hot wind. 2. Procédé suivant la revendication 1, caractérisé en ce que ladite injection à contre-courant est couplée avec une injection conventionnelle de combustible solide pulvérulent dans le sens dudit courant de vent chaud. 2. Method according to claim 1, characterized in that said injection against the current is coupled with a conventional injection of pulverulent solid fuel in the direction of said current of hot wind.
BE9400261A 1994-03-10 1994-03-10 Method for injecting a pulverulent solid fuel into a tank furnace BE1008143A6 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE9400261A BE1008143A6 (en) 1994-03-10 1994-03-10 Method for injecting a pulverulent solid fuel into a tank furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE9400261A BE1008143A6 (en) 1994-03-10 1994-03-10 Method for injecting a pulverulent solid fuel into a tank furnace

Publications (1)

Publication Number Publication Date
BE1008143A6 true BE1008143A6 (en) 1996-01-30

Family

ID=3888025

Family Applications (1)

Application Number Title Priority Date Filing Date
BE9400261A BE1008143A6 (en) 1994-03-10 1994-03-10 Method for injecting a pulverulent solid fuel into a tank furnace

Country Status (1)

Country Link
BE (1) BE1008143A6 (en)

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: CENTRE DE RECHERCHES METALLURGIQUES - CENTRUM VOO

Effective date: 19960331