EP1739194B1 - Procédé pour l'injection par ultrasons d'un agent d'oxidation dans un four de fusion - Google Patents

Procédé pour l'injection par ultrasons d'un agent d'oxidation dans un four de fusion Download PDF

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Publication number
EP1739194B1
EP1739194B1 EP06116219A EP06116219A EP1739194B1 EP 1739194 B1 EP1739194 B1 EP 1739194B1 EP 06116219 A EP06116219 A EP 06116219A EP 06116219 A EP06116219 A EP 06116219A EP 1739194 B1 EP1739194 B1 EP 1739194B1
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EP
European Patent Office
Prior art keywords
injectors
ultrasound
oxidizing agent
injecting
supplied
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.)
Active
Application number
EP06116219A
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German (de)
English (en)
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EP1739194A1 (fr
EP1739194B2 (fr
Inventor
Stéphane c/o Messer France SAS Appl. Techn Arnoux
Philippe Messer France SAS Appl. Tech. Grognet
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Messer France SAS
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Messer France SAS
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • C21B5/023—Injection of the additives into the melting part
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B11/00—Making pig-iron other than in blast furnaces
    • C21B11/02—Making pig-iron other than in blast furnaces in low shaft furnaces or shaft furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge

Definitions

  • the invention relates to a method for operating a melting furnace in which feedstocks, fuel, and at least one oxidizing agent are fed to a melting zone, wherein the oxidizing agent is injected into the melting zone by means of a plurality of injectors arranged at preferably equal angular intervals around the circumference of the melting furnace the injection takes place at least in one process section by a chronological sequence of flow and rest phases (pulses) of the individual injectors.
  • the total duration of the flow phases is varied by changing the ratio of the periods from flow phase to resting phase as well as the pulse frequency;
  • the duration of the flow phases is between 50% and 99% of the duration of the entire process section.
  • the invention is therefore based on the object of specifying a method by means of which the melting operation in a melting furnace, in particular in a shaft furnace, which is equipped with several injectors for injecting an oxidant at supersonic speed, well dosed and uniform.
  • This object is achieved on the basis of the method described above according to the invention in that the ratio of the flow and resting phase of the injectors and the number of injectors injecting with ultrasound is varied in such a way depending on a predetermined or continuously determined quantity of oxidizing agent to be supplied according to a predetermined program a steady course of the quantity of oxidizing agent supplied with ultrasound and a flow pattern substantially uniformly covering the melting zone are achieved.
  • the supply of the oxidizing agent, which is introduced with ultrasound into the molten zone is controlled according to a program. If the amount of the total amount of oxidant to be supplied with ultrasound falls below a value set by the program, one or more injectors will be switched off, with a "disconnected" injector, as understood here, not supplying the smelting furnace with any oxidizing agent or oxidizing agent at subsonic speed.
  • one or more injectors are then "switched on", ie they now supply oxidizing agents with ultrasound.
  • the course of the amount of oxidant supplied with ultrasound should be continuous, ie. simultaneously with the change in the number of ultrasonically injecting injectors, the oxidant supply should be adjusted via the injectors injecting thereafter with ultrasound via a corresponding change in the ratio of flow and quiescent phase such that the total amount of oxidant supplied with ultrasound corresponds to that required for that time.
  • a uniform flow pattern covering the melting zone is to be achieved, i. the ultrasonically injecting injectors are each arranged on the furnace so that a uniform loading of the molten zone is ensured with oxidizing agent.
  • the term "effective duration of the flow phases" or "effective duration of the rest phases” should be understood to mean the total duration possibly distributed over one or more pulses during which the injector is open, ie in flow phase, or closed, ie in rest phase.
  • the oxidant is injected at supersonic velocity into the melt zone, and during a quiescent phase, injection is throttled to a velocity below supersonic velocity or shut off altogether.
  • the range of adjustment of the amount of oxidant injected into the molten zone is between zero (at zero flow duration) and the maximum amount of exhaust of all injectors used (full load operation of all injectors and zero duration of the dwell phase).
  • the amount of oxidant injected into the molten zone with ultrasound varies widely.
  • Formula (1) therefore provides a good basis for automated control of the injectors.
  • the per unit of time to be supplied with ultrasound amount of oxidant can be determined by means of a computer program, the number of connected injectors and the effective duration of the flow and rest phases.
  • empirically recorded values can be included on the optimal for the respective setting pulse rate and possibly an optimized sequence of different pulses and on and the optimal working range of the injectors used.
  • the oxidant flow is influenced very accurately, without affecting the ultrasound injection. Too long periods of rest, during which no oxidizing agent is injected with ultrasound, are avoided as well as a non-uniform application of the melting zone.
  • the emission of pollutants such as NO x and CO is significantly reduced.
  • the consumption of materials in the furnace, as well as the consumption of fuels, coke and electrical energy can be reduced.
  • the method according to the invention is particularly suitable for melting processes in which a melting zone is produced by burning a fuel with an oxidizing agent in a melting furnace in which a feedstock is melted.
  • the shaft furnaces come into question, especially cupolas, such as hot blast. Warm wind, cold wind, secondary wind, long-term, or rotary kilns.
  • the feed is added to the furnace, for example, in the form of steel scrap, cast broke, pig iron or chips. It also uses non-metallic aggregates such as coke, silicon carbide, ferrosilicon, ferromanganese, lime and gravel.
  • the oxidizing agent is preferably oxygen.
  • a further oxidizing agent for example air, can be introduced into the melting zone in a time-constant or likewise pulsating manner.
  • the supply of oxidant is controlled such that when the difference between the maximum possible power of all ultrasonically injecting injectors and the amount of oxidant to be supplied to ultrasound corresponds to the maximum power of a single injector, the number of ultrasonically injecting injectors decreases by one and then, when the amount of oxidant to be supplied with ultrasound exceeds the maximum possible power of all injectors injecting ultrasound, the number of injectors injecting ultrasound is increased by one, with the amount of oxidant to be supplied by ultrasound injection then being uniformly distributed to the ultrasonically injecting injectors. At full load, all injectors of the melting furnace work in continuous operation.
  • all the injectors When it is necessary to reduce the supply of ultrasonically oxidized oxidant, all the injectors initially go into pulsed operation, ie, all the injectors will operate in a flow-phase and quiescent-sequence sequence, as in FIG EP 1 242 781 B1 described method, wherein the total supplied with ultrasound amount of oxidizing agent is adjusted by changing the ratio of flow and rest phase.
  • the lower the need for oxidizing agent the longer the duration of the rest periods of the injectors. If the demand drops such that the sum of the rest phases of all injectors overall corresponds to the maximum output of a single injector, one of the injectors is switched off.
  • the total flow of the ultrasonically injected oxidant is distributed evenly to the connected injectors, ie the remaining connected injectors operate initially at full load, and go into the pulse-wise operation, as soon as the demand is further reduced. The same applies to an increase in demand.
  • the shutdown is such that the remaining connected injectors are evenly distributed around the circumference of the furnace.
  • the injectors are operated asymmetrically on the furnace and after a not too long time a change of the connected injectors takes place.
  • the goal is in any case to apply the molten zone of the furnace as evenly as possible with oxygen.
  • the regulation of the oxygen supply is carried out as follows: In the Voillast stipulate the supply takes place via all injectors. With a reduction in oxygen demand, the injectors go into pulse-wise operation, i. the supply of oxygen takes place in these lances at discrete time intervals in the form of a sequence of flow phase and resting phase, the duration of which results from the respective oxygen requirement. The lower the oxygen requirement, the longer the duration of the rest periods of the injectors. In order to make the oxygen supply as uniform as possible, the injectors are driven alternately in pulses of different lengths, but care is taken that the injection always takes place substantially symmetrically to the central axis of the furnace.
  • the oxygen demand is reduced by a value corresponding to the performance of an injector - or an integer multiple thereof - one or more injectors are switched off, the deactivation taking place in such a way that the still connected injectors act as uniformly as possible on the melting zone of the shaft furnace ,
  • the resting phases of the connected injectors accordingly to make sure a steady transition of Oxidationsffenmengenzuschreib.
  • the connected injectors are operated in the same way as described above. In this operating state, it is expedient to control the connected injectors alternately.
  • the injectors switched off during the described method step are preferably switched on in subsequent method steps or during the melting of a subsequent batch, so that in each case a change of zuzugateden injectors takes place.

Landscapes

  • 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)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Claims (4)

  1. Procédé d'exploitation d'un four de fusion, dans lequel des matériaux de charge, du combustible et au moins un agent oxydant sont introduits dans une zone de fusion, l'agent oxydant étant injecté dans la zone de fusion à une vitesse supersonique au moyen d'une pluralité d'injecteurs disposés à des intervalles angulaires de préférence égaux autour de la périphérie du four de fusion, et l'injection, à au moins une des étapes du processus, étant effectuée par une séquence temporelle de phases d'écoulement et de repos (impulsions) des injecteurs individuels, caractérisé en ce que l'on fait varier le rapport des phases d'écoulement et de repos des injecteurs et le nombre d'injecteurs injectant par ultrasons selon un programme prédéterminé en fonction d'une quantité prédéterminée ou déterminée en continu d'agent oxydant à fournir, de manière à réaliser un profil lisse de la quantité d'agent oxydant fournie par ultrasons et un schéma d'écoulement qui recouvre de façon sensiblement uniforme la zone de fusion.
  2. Procédé selon la revendication 1, caractérisé en ce que, chaque fois que la différence entre là capacité maximale de tous les injecteurs injectant par ultrasons et la quantité totale d'agent oxydant à fournir par injection ultrasonique correspond à la capacité maximale d'un seul injecteur, le nombre d'injecteurs injectant par ultrasons est réduit d'une unité, et en ce que, chaque fois que la quantité d'agent oxydant à fournir par injection ultrasonique dépasse la capacité maximale de tous les injecteurs injectant par ultrasons, le nombre d'injecteurs injectant par ultrasons est augmenté d'une unité, la quantité d'agent oxydant à fournir par injection ultrasonique étant ensuite, dans chaque cas, répartie uniformément entre les injecteurs injectant par ultrasons.
  3. Procédé selon la revendication 1 ou selon la revendication 2, caractérisé en ce que les injecteurs qui sont, dans chaque cas, en cours d'injection par ultrasons sont disposés uniformément autour de la périphérie du four de fusion.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les phases d'écoulement et de repos des injecteurs fonctionnant en mode pulsé et injectant par ultrasons sont adaptées les unes aux autres de telle manière que les injecteurs injectant par ultrasons soient actionnés alternativement.
EP06116219A 2005-07-02 2006-06-28 Procédé pour l'injection par ultrasons d'un agent d'oxidation dans un four de fusion Active EP1739194B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005031019A DE102005031019A1 (de) 2005-07-02 2005-07-02 Verfahren zur Ultraschall-Eindüsung eines Oxidationsmittels in einen Schmelzofen

Publications (3)

Publication Number Publication Date
EP1739194A1 EP1739194A1 (fr) 2007-01-03
EP1739194B1 true EP1739194B1 (fr) 2008-01-30
EP1739194B2 EP1739194B2 (fr) 2013-01-09

Family

ID=37012109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06116219A Active EP1739194B2 (fr) 2005-07-02 2006-06-28 Procédé pour l'injection par ultrasons d'un agent d'oxidation dans un four de fusion

Country Status (3)

Country Link
EP (1) EP1739194B2 (fr)
AT (1) ATE385260T1 (fr)
DE (2) DE102005031019A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111315900A (zh) * 2017-06-22 2020-06-19 乔治洛德方法研究和开发液化空气有限公司 竖炉以及氧化剂向其中的注入
EP3418401A1 (fr) 2017-06-22 2018-12-26 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Four à cuve et d'injection d'agent oxydant dans celui-ci

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19646802A1 (de) * 1996-11-13 1998-05-14 Messer Griesheim Gmbh Verfahren und Vorrichtung zum Betreiben eines Schachtofens
DE29711593U1 (de) * 1997-07-02 1997-09-04 Westfalen AG, 48155 Münster Vorrichtung zur thermischen Behandlung eines Rohmaterials
EP0992753A3 (fr) * 1998-08-04 2001-08-08 Linde Gas Aktiengesellschaft Procédé pour l'opération d'un four à cuve et four à cuve
DE19954556A1 (de) * 1999-11-12 2001-05-23 Messer Griesheim Gmbh Verfahren zum Betreiben eines Schmelzofens
DE10249235B4 (de) * 2002-10-23 2005-07-21 Air Liquide Deutschland Gmbh Verfahren zum Betreiben eines Schachtofens

Also Published As

Publication number Publication date
EP1739194A1 (fr) 2007-01-03
ATE385260T1 (de) 2008-02-15
DE502006000324D1 (de) 2008-03-20
EP1739194B2 (fr) 2013-01-09
DE102005031019A1 (de) 2007-01-11

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