EP1507877B1 - Procede de frittage de matieres contenant de l'oxyde de fer sur une machine de frittage - Google Patents

Procede de frittage de matieres contenant de l'oxyde de fer sur une machine de frittage Download PDF

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Publication number
EP1507877B1
EP1507877B1 EP03740059A EP03740059A EP1507877B1 EP 1507877 B1 EP1507877 B1 EP 1507877B1 EP 03740059 A EP03740059 A EP 03740059A EP 03740059 A EP03740059 A EP 03740059A EP 1507877 B1 EP1507877 B1 EP 1507877B1
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EP
European Patent Office
Prior art keywords
gas
sinter
sintering
extraction
exhaust gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03740059A
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German (de)
English (en)
Other versions
EP1507877A1 (fr
Inventor
Wolf Lanzer
Manfred Ludwig
Karl-Rüdiger HÜSIG
Arnd KÖFLER
Walter Gerlach
Romuald Hartmann
Hans-Joachim Werz
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Salzgitter Mannesmann GmbH
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Salzgitter Mannesmann GmbH
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Application filed by Salzgitter Mannesmann GmbH filed Critical Salzgitter Mannesmann GmbH
Publication of EP1507877A1 publication Critical patent/EP1507877A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • 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
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • C22B1/205—Sintering; Agglomerating in sintering machines with movable grates regulation of the sintering process

Definitions

  • the invention relates to a method for sintering of iron oxide-containing substances on a sintering belt having a suction belt, suction boxes and a firing furnace according to the preamble of claim 1.
  • the sintering of iron oxide-containing materials, in particular of iron ores or iron ore concentrates is carried out on sintering machines.
  • the sinter mixture consisting of the iron ore, return material, solid fuel and aggregates, is charged onto the sintering belt and the fuel is ignited on the surface of the material bed under the ignition furnace. Subsequently, fresh air is sucked through the sintering bed and the sintering front migrates from top to bottom through the sintered bed. From the suction boxes under the upper strand of the sintered bed, the exhaust gas is sucked into the gas collection system and passed to the atmosphere after cleaning.
  • the sintering process requires heat transfer between the hot combustion gas and the cold solid. Solids quantities and air quantities are heat equivalent.
  • the exhaust gas contains evaporated water from the sintering mixture, CO 2 from the combustion of the fuel and calcination processes, sulfur oxides from the combustion of sulfur - mainly from the added fuel - CO from incomplete combustion, false air and air on the side walls of the grate carriage between the Feed enters the exhaust unused.
  • the exhaust gas also contains dioxins and furans, in particular the exhaust gas withdrawn from the rear part of the sintering belt. Furthermore, the exhaust gas carries with it dust that needs to be removed.
  • the exhaust gas is partially detected and once returned as recycle gas to the sintering belt and discharged once as residual gas.
  • a fresh air supply line opens in the circulation line.
  • JP 5206380 A a sintering machine for iron oxide-containing substances with a recycle gas line and a residual gas line known.
  • some suction boxes are equipped with a slide, so that the cycle gas quantity can be increased.
  • the object of the invention is to further optimize the sintering process in such a way that the dioxins and furans still contained in the residual gas and the amount of dust are reliably below the limits prescribed by the approval authority while the exhaust gas quantity and sinter quality are still low.
  • the amount of heat of the withdrawn recycle gas is used to heat the residual gas, wherein the heating is at a temperature to avoid the dew point below, but which is lower than the ensured mixed temperature at discharge of the total amount of exhaust gas.
  • the proposed in terms of the exhaust gas distribution of the process surface of the sintering belt in a section whose exhaust gas is recycled as recycle gas and in a section whose exhaust gas is discharged as residual gas has the purpose of the exhaust gas stream in a polluted less polluted subset and in a subset to divide with higher concentrations.
  • the less loaded subset can be discharged as residual exhaust gas after deposition of the dust and the adsorbents introduced - including the adsorbed dioxins and furans - and after heating to avoid the acid dew point on the chimney.
  • the higher amount of dioxins and furans burdened is recycled, taking advantage of the fact that when returning to the hot sinter mixture a large part of the dioxins and furans is split and thus rendered harmless.
  • the proposed variation of the process area distribution is a very simple but effective means of optimizing the process.
  • it can be achieved that the ratio of oxygen supply to oxygen consumption approaches the ideal state 1 and thus the amount of exhaust gas is minimized.
  • the performance of the plant can be influenced while the quality of sintering remains constant.
  • the circulated exhaust gas has the further effect that the required oxygen supply is lower compared to a normal process. This makes it possible to cover the need in the limiting case with the oxygen supplied by the sucked-in secondary air. This saves the otherwise additionally required fresh air to be supplied separately.
  • FIG. 1 shows, in the form of a schematic flow diagram, a sintering plant operating according to the invention.
  • the core of the plant is a sintering belt 1, in which case the task of sintering is done on the right and the finished sinter is thrown off to the left.
  • This transport direction is indicated by an arrow 2.
  • suction boxes and associated exhaust pipes 3, 4 are arranged, wherein the exhaust gas withdrawn in the initial region of the sintering belt 1 discharged as residual gas and the exhaust gas withdrawn in the end region of the sintering belt 1 is circulated.
  • the recirculated exhaust gas is fed via a line 5 to a heat exchanger 6 and then via a further line 7, a filter 8 disposed therein, which has the function to separate the dust from the exhaust gas.
  • the recirculated gas is fed via a line 9 to the sintering belt 1 and distributed uniformly over the sintering belt 1 by means of a suction fan 22.
  • the arrows are intended to illustrate the task of recirculated exhaust gas on the sintering belt 1.
  • the thesisschleusende residual gas is over a line 10 is supplied to the already mentioned heat exchanger 6, wherein the heat of the circulating gas is used for the heating of the residual gas. This should avoid a dew point below sulfuric acid.
  • the residual gas is fed via a line 11 to a fly-flow reactor 12.
  • the optional separate fresh air supply 21 shown in FIG. 1 is only required if the oxygen supply introduced by the sucked-in secondary air should be too low.
  • the finished sinter is dropped off at the end of the sintering belt 1 and cooled in rotary coolers 17, 18.
  • the sucked in the rotary coolers 17, 18 air is supplied via a line 19 to a filter 20 to separate the entrained dust.
  • the extracted dusts of the sintering plant itself and accumulating Gichtstaub and G cumhallenstaub from the blast furnace with water with the addition of burnt lime to conical particles (mini pellets) are agglomerated.
  • This agglomeration takes place in a mechanical vortex mixer 24, also called "Eirich mixer”.
  • the moist agglomerates are fed continuously to the sintering mixture in the indication area.
  • FIGS. 2 and 3 the sintering process according to the prior art ( FIG. 2 ) and the process according to the invention ( FIG. 3 ) are compared with one another.
  • the thick line drawn in FIG. 3 symbolizes the separation according to the invention of the sintering belt 1 into a region of recycle gas and a region of residual gas, the double arrow indicating the possibility of displacement of the separation point.
  • the displacement of the separation point according to the invention makes it possible to optimize the process to a large extent.
  • the optimum can be set in a simple manner, depending on the process conditions.
  • FIG. 4 shows, in a schematic representation, a partial region of the arrangement of the suction boxes 25 and the flue gas collecting lines 5, 10.
  • the suction boxes 25.1 located in the initial region of the sintering belt have a fixed separation 26 with respect to the discharge line circulating gas 5. This is followed in this embodiment, a total of four suction boxes 25.2, which have a variable separation 27. Variable separation 27 means that these suction boxes 25.2 optional on the discharge line cycle gas 5 or on the discharge line residual gas 10 can be switched. The effect that can be achieved has been explained in detail at the beginning.
  • the solid separation 29 arranged in the discharge line 10 can be removed so as to be able to discharge the entire exhaust gas arising.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Treating Waste Gases (AREA)

Claims (7)

  1. Procédé de frittage de matières contenant de l'oxyde de fer sur une machine de frittage, dans lequel un mélange de frittage contenant un combustible solide est allumé, des gaz contenant de l'oxygène sont conduits à travers le mélange de frittage et le produit fritté final chaud est refroidi après éjection, une partie des gaz d'échappement est réacheminée à la machine de frittage en tant que gaz recyclés ayant une concentration en substances toxiques plus élevée et l'autre partie des gaz d'échappement étant évacuée en tant que gaz résiduaires ayant une concentration en substances toxiques plus faible, les poussières contenues dans les gaz recyclés et les gaz résiduaires étant réchauffées avant l'évacuation, et les poussières produites dans le local de l'installation et lors du filtrage à froid étant aspirées et éliminées, la séparation de la quantité totale de gaz d'échappement en gaz recyclés et en gaz résiduaires ayant lieu par variation de la surface de traitement (bande de frittage), le lieu de l'interface entre l'aspiration pour les gaz recyclés et l'aspiration pour les gaz résiduaires étant choisi de manière à ce qu'une quantité de gaz d'échappement maximale soit recyclée sans nuire à la qualité et à la capacité de frittage, et l'énergie calorifique des gaz recyclés extraits étant utilisée pour réchauffer les gaz résiduaires, le réchauffage ayant lieu à une température permettant d'éviter de descendre au-dessous du point de rosée du H2SO4, mais qui est inférieure à la température de mélange obtenue lors de l'évacuation de la totalité des gaz d'échappement, et les gaz contenant de l'oxygène passant à travers le mélange de frittage se composant d'air parasite aspiré et d'air frais amené séparément et, en cas d'apport en oxygène suffisant par l'air parasite, la quantité d'air frais amenée séparément tendant vers une valeur minimale.
  2. Procédé selon la revendication 1,
    caractérisé en ce que la valeur minimale est égale à zéro.
  3. Procédé selon les revendications 1 et 2,
    caractérisé en ce que l'aspiration de la zone du filtrage à froid et l'aspiration du local de l'installation ont lieu séparément et, dans le cas d'une alimentation en air frais séparée, les gaz aspirés du filtrage à froid sont conduits en tant que gaz contenant de l'oxygène jusqu'au mélange de frittage et le mélange de frittage est alors utilisé comme filtre pour les poussières entraînées.
  4. Procédé selon la revendication 1,
    caractérisé en ce que la quantité de gaz recyclés est répartie régulièrement sur la totalité de la bande de frittage.
  5. Procédé selon la revendication 1,
    caractérisé en ce que l'aspiration s'effectuant dans la zone d'éjection du produit fritté final est couplée à l'aspiration du local de l'installation.
  6. Procédé selon la revendication 5,
    caractérisé en ce que l'énergie calorifique contenue dans les gaz d'échappement du produit fritté final est utilisée sur le plan énergétique.
  7. Machine de frittage pour le frittage de matières contenant de l'oxyde de fer, comprenant une bande de frittage, des caissons d'aspiration, un four d'allumage, un refroidisseur pour le produit fritté final, des ventilateurs, des filtres et des conduites pour mettre en oeuvre le procédé selon la revendication 1,
    caractérisée en ce que, dans la zone des interfaces entre aspiration des gaz recyclés et des gaz résiduaires, les caissons d'aspiration (25.2) sont munis de tiroirs pour faire varier l'affectation de l'aspiration et, dans la conduite d'évacuation (5) des gaz recyclés, est agencé le côté dégagement d'un échangeur de chaleur (6) et, dans la conduite d'évacuation (10) des gaz résiduaires, est agencé le côté réception de l'échangeur de chaleur (6), un réacteur à flux entraîné (12) connu en soi étant monté en aval dudit échangeur, et, dans le cas d'alimentation en air frais séparée (21), le ventilateur est utilisé pour envoyer des gaz contenant de l'oxygène sur le mélange de frittage en tant qu'agrégat pour l'aspiration de la zone de la filtration à froid.
EP03740059A 2002-05-29 2003-05-27 Procede de frittage de matieres contenant de l'oxyde de fer sur une machine de frittage Expired - Lifetime EP1507877B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10224448 2002-05-29
DE10224448A DE10224448B4 (de) 2002-05-29 2002-05-29 Verfahren zum Sintern von eisenoxidhaltigen Stoffen auf einer Sintermaschine
PCT/DE2003/001813 WO2003102252A1 (fr) 2002-05-29 2003-05-27 Procede de frittage de matieres contenant de l'oxyde de fer sur une machine de frittage

Publications (2)

Publication Number Publication Date
EP1507877A1 EP1507877A1 (fr) 2005-02-23
EP1507877B1 true EP1507877B1 (fr) 2007-04-11

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ID=29557472

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Application Number Title Priority Date Filing Date
EP03740059A Expired - Lifetime EP1507877B1 (fr) 2002-05-29 2003-05-27 Procede de frittage de matieres contenant de l'oxyde de fer sur une machine de frittage

Country Status (7)

Country Link
EP (1) EP1507877B1 (fr)
JP (1) JP2005530923A (fr)
KR (1) KR20050004890A (fr)
AT (1) ATE359379T1 (fr)
AU (1) AU2003273380A1 (fr)
DE (2) DE10224448B4 (fr)
WO (1) WO2003102252A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT503199B1 (de) * 2006-01-19 2008-02-15 Voest Alpine Ind Anlagen Verfahren zum sintern auf einer sintermaschine
CN105091615B (zh) * 2015-08-06 2017-10-31 中南大学 一种铁矿烧结烟气污染物的综合处理方法
CN108375308A (zh) * 2018-03-30 2018-08-07 内江至诚铂业科技有限公司 一种自清洁箱式高效电阻炉

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849115A (en) * 1972-03-24 1974-11-19 Mcdowell Wellman Eng Co Sintering process
JPS5240415A (en) * 1975-09-27 1977-03-29 Hitachi Zosen Corp Process for preventing generation of sulfuric acid mist in sintering u nit for iron ore
JPS5263801A (en) * 1975-11-21 1977-05-26 Hitachi Zosen Corp Sintering equipment of exhaust gas ciarulating type
DE2612831B1 (de) * 1976-03-26 1977-09-01 Metallgesellschaft Ag Saugkasten fuer wanderroste
ATE129750T1 (de) * 1991-10-03 1995-11-15 Metallgesellschaft Ag Verfahren zum sintern von eisenoxidhaltigen stoffen auf einer sintermaschine.
DE19623981A1 (de) * 1996-06-15 1998-01-08 Rheinische Braunkohlenw Ag Verfahren zum Entfernen schädlicher Inhaltsstoffe aus Abgasen von Sinteranlagen

Also Published As

Publication number Publication date
DE10224448A1 (de) 2003-12-18
KR20050004890A (ko) 2005-01-12
AU2003273380A1 (en) 2003-12-19
WO2003102252A1 (fr) 2003-12-11
EP1507877A1 (fr) 2005-02-23
DE50307021D1 (de) 2007-05-24
ATE359379T1 (de) 2007-05-15
DE10224448B4 (de) 2004-12-16
JP2005530923A (ja) 2005-10-13

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