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WO2001031070A1 - Four a etageres - Google Patents

Four a etageres Download PDF

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Publication number
WO2001031070A1
WO2001031070A1 PCT/EP2000/010138 EP0010138W WO0131070A1 WO 2001031070 A1 WO2001031070 A1 WO 2001031070A1 EP 0010138 W EP0010138 W EP 0010138W WO 0131070 A1 WO0131070 A1 WO 0131070A1
Authority
WO
WIPO (PCT)
Prior art keywords
deck oven
floor
furnace
arms
openings
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.)
Ceased
Application number
PCT/EP2000/010138
Other languages
German (de)
English (en)
Inventor
Romain Frieden
Patrick Hutmacher
Pascal Ferretti
Stephan Schons
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.)
Paul Wurth SA
Original Assignee
Paul Wurth 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 Paul Wurth SA filed Critical Paul Wurth SA
Priority to AU77880/00A priority Critical patent/AU7788000A/en
Publication of WO2001031070A1 publication Critical patent/WO2001031070A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
    • F27B9/18—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path under the action of scrapers or pushers
    • F27B9/185—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path under the action of scrapers or pushers multiple hearth type furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/06—Making spongy iron or liquid steel, by direct processes in multi-storied furnaces
    • 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
    • F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material

Definitions

  • the present invention relates to a deck oven and a method for the thermal treatment of fine-grained or powdery material in a deck oven.
  • Deck oven are used e.g. B. in the drying of fine-grained or powdery Mate ⁇ al, in the pyrometallic treatment of residues and in the direct reduction of iron ore. From DE 1 225 673 z. B. such a method for drying reduction of fine iron ore in a deck oven known.
  • the furnace masonry of such a deck furnace is surrounded by a sheet metal jacket. Arms are rotatably arranged on the respective floors. The arms are equipped with stirring teeth or crusher which have the task of conveying the material on a spiral path either from the inside out or from the outside in so that it falls through the drop openings provided on the outer or inner circumference of the floor to the next lower floor can and in this way traverses the deck oven from top to bottom.
  • the gases flow from bottom to top through the deck oven at a relatively high speed, thereby removing large amounts of dust from the deck oven.
  • the exhaust gases are dedusted and the dusts are returned to the deck oven. The finer the material to be treated, the greater the amount of dust discharged.
  • the object of the invention is to provide a deck oven in which the discharge of fine-grained or powdery material is reduced together with the exhaust gases.
  • a deck oven which has a plurality of superimposed, self-supporting floors, a rotatable shaft with a plurality of arms which project above the floors and are designed such that they transfer fine-grained or powdery material from top to bottom through the deck oven, the material on one level spiral
  • ERSATZBLAH (RULE 26) from the inside to the outside and from there through drop openings to the floor below and then spirally from outside to inside and from there through drop openings to the floor below.
  • the deck oven is characterized in that on different floors at least one arm has a downpipe through which the material is conveyed to the respective lower floor.
  • the material flow is therefore separated from the gas flow.
  • the arms are designed in such a way that the material only falls through the drop opening (s) onto the floor below, under which the arm (arms) with the downpipe is (are) located.
  • the arms that convey the material through the drop openings to the floor below rotate synchronously with the arms of the floor below with the correspondingly attached downspouts, so that the material falls through the downpipes onto the floor.
  • the gas flows much more up through the other openings that are not covered by the downpipe. As a result, far less fine-grained or powdery material is carried with the exhaust gases from the tiered oven.
  • fine-grained or powdery material means material that has a relatively large proportion of material that has a fine granulometry. The material does not have to have a uniform grain size distribution.
  • a method for the thermal treatment of fine-grained or powdery material in a deck oven which has several superimposed, self-supporting floors, a rotatable shaft with several arms that project above the floors and are arranged so that they the material Transfer from top to bottom through the deck oven, whereby the material is transported spirally on one floor from the inside to the outside and from there through drop openings to the floor below and then spirally from outside to inside and from there through drop openings to the floor below are transported and a gas stream is passed from bottom to top through the deck oven.
  • the process is characterized in that the material flow is separated from the gas flow.
  • the material is advantageously passed through a different drop opening than the gas stream.
  • the present invention can be used in a wide variety of processes for the treatment of fine-grained or powdery or dust-containing material, be it for drying or in the thermal treatment of solid material, thermal treatment being understood only to mean heating or else pyrometailic treatments. Pyrometailic treatments are, for example, reductions of various metal oxides, or recycling and separation of residues, the oxides being sequentially reduced and discharged from the deck oven either in gaseous form or as solid substances.
  • Multi-deck ovens are also suitable for the thermal treatment of residues containing heavy metals, e.g. Sludges from surface treatment, pickling and cleaning, metalization and tinning processes of metal parts.
  • residues containing heavy metals e.g. Sludges from surface treatment, pickling and cleaning, metalization and tinning processes of metal parts.
  • FIG. 1 shows a section through a deck oven
  • Fig.2 part of a deck oven in axial section
  • Fig.4 a section through Fig. 2 according to B-B.
  • Fig. 1 shows a section through a deck oven 10, which has several - in this case eleven - stacked floors 12. These self-supporting levels 12, as well as the jacket 14, cover 16 and the bottom 18 of the furnace are made of refractory material.
  • a vent 26 is provided in the lid 16 of the furnace 10, through which the gases can be evacuated from the furnace and an opening 28 through which the fine-grained or powdery material can be applied to the top floor.
  • This material is, for example, iron ore, filter dust of various origins, residues containing metal oxide, the lead, zinc, nickel and iron oxides, etc. included, etc.
  • Multi-deck ovens are also suitable for treating sludge, which is first dried on the top floors of the multi-deck oven and then treated if necessary. This material can be mixed with reducing agents and other additives before or after it is placed in the deck oven.
  • a shaft 20 is attached, to which arms 22 are attached, which protrude above the respective floors.
  • the shaft has a ring gear and is supported in a track bearing.
  • the sprocket is driven by a pinion.
  • the drive movement for the pinion is transmitted by an electric motor via a reduction gear, a clutch and a drive shaft.
  • the shaft 20 and the arms 22 are air-cooled and openings 24 are provided on the arms through which the air can flow into the interior of the furnace and can be used there for afterburning.
  • At least one inlet opening 30 is provided in the side walls of the furnace 10, usually in the upper third, through which reducing agents or other auxiliary substances can be introduced into the furnace.
  • the reducing agents can be in gaseous form as well as in liquid or solid form.
  • the reducing agents are carbon monoxide, hydrogen, natural gas, petroleum and petroleum derivatives, or solid carbon carriers, e.g. around lignite coke, petroleum coke, blast furnace dust, coal, or the like.
  • the carbon carrier which is introduced to a level further down in the furnace 10, is mixed there by the arms 22 with the heated, powdery material. Due to the high temperature and the presence of carbon monoxide, the oxides contained in the powdery material are gradually reduced during transport through the deck oven 10.
  • nozzles 32 are provided for blowing in hot (350 ° C. to 500 ° C.), oxygen-containing gases, through which air or another oxygen-containing gas can be introduced into the furnace 10. Due to the high temperatures and the presence of oxygen, part of the carbon burns to carbon dioxide, which in turn reacts with the excess carbon and is converted to carbon monoxide. The carbon monoxide finally reduces the oxides. Since this reaction is predominantly endothermic, it makes sense to install burners 34 in the lower part of the furnace, which ensure a constant high temperature in the lowest levels of the furnace. Gas or coal dust burners can be used here.
  • These burners 34 can be fired with air for preheating and / or for additional heating with gas or coal dust.
  • An additional reducing gas can be generated by the quantitative ratio between oxygen and fuel material, or afterburning of the process gases is achieved with excess air.
  • an overflow in the burner shot of carbon monoxide With external combustion chambers, it can be avoided that the ashes of the burned coal get into the furnace.
  • the temperatures in the combustion chambers are chosen so that the slag can be drawn off in liquid form and can be disposed of in a glazed form.
  • the production of carbon monoxide reduces the consumption of solid carbon carriers in the furnace 10 and thus also the ash content in the finished product.
  • Openings 36 are provided in the side wall of the furnace at the level of the middle floors, through which hot gases can be removed from the furnace.
  • a gaseous reducing agent e.g. Carbon monoxide or hydrogen
  • special nozzles 37 provided.
  • the reduction of the ore can be completed in this atmosphere with an increased reduction potential.
  • the treated material is then discharged through the outlet 39 in the bottom 18 of the furnace 10 together with the ashes of the reducing agents.
  • This furnace 10 allows various problem wastes such as e.g. Recycle dust and sludge contaminated by metals.
  • the dusts or sludges can thus be introduced into the deck oven 10 through the opening 28 in the lid 16.
  • Metal oxide-containing dusts and sludges can be introduced into the furnace 10 together with the solid reducing agents through the inlet opening 28 or after the solid reducing agents through one or more openings in the side wall.
  • Fig. 2 shows part of a deck oven in axial section. Only the first three superimposed floors are shown on this figure.
  • the arms 22 are generally opposed, with four arms normally provided on each floor.
  • a downpipe 42 is attached to one arm per floor, except on the first, which covers the drop openings 44 on the next higher floor.
  • the arms 22 are provided with stirring teeth 46 or craters which have the task of conveying the powdery material on a spiral path 48 either from the inside out or from the outside in so that it falls through the drop openings 44 provided on the outer or inner circumference of the floor can fall into the next lower floor and in this way pass through the deck oven from top to bottom (see also FIGS. 3 and 4).
  • the stirring teeth 46 are arranged such that only one arm 22 per level conveys the powdery material through the drop openings 44.
  • a downpipe 42 is attached at the level of the drop openings 44. Due to the synchronous rotation of the two arms, the downpipe always covers the opening through the powdery material that trickles down onto the floor.
  • the downpipe is designed so that only a small amount of gas can get up through the downpipe. Since the other drop openings are free, the gas will go up through these openings. Since hardly any gas moves up through the downpipe, hardly any powdery material is entrained. As a result, the dust concentration in the flue gases is much lower than in the conventional deck oven.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

L'invention concerne un four à étagères présentant plusieurs étagères autoporteuses superposées, un arbre rotatif muni de plusieurs bras dépassant des étagères et disposés de manière à transférer une matière à grains fins ou pulvérulente de haut en bas, à travers le four à étagères. La matière concernée qui se trouve sur une étagère est acheminée de manière hélicoïdale de l'intérieur vers l'extérieur, puis sur l'étagère qui se trouve immédiatement en dessous, par des orifices de chute et enfin, de manière hélicoïdale, de l'extérieur vers l'intérieur et de là, sur l'étagère située en dessous, par des orifices de chute. Ce four à étagères se caractérise en ce que sur différentes étagères, au moins un bras présente un tuyau de chute à travers lequel la matière est acheminée dans chaque cas sur l'étagère située en dessous.
PCT/EP2000/010138 1999-10-25 2000-10-16 Four a etageres Ceased WO2001031070A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU77880/00A AU7788000A (en) 1999-10-25 2000-10-16 Multiple-level furnace

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU90463 1999-10-25
LU90463A LU90463B1 (de) 1999-10-25 1999-10-25 Etagenofen

Publications (1)

Publication Number Publication Date
WO2001031070A1 true WO2001031070A1 (fr) 2001-05-03

Family

ID=19731842

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/010138 Ceased WO2001031070A1 (fr) 1999-10-25 2000-10-16 Four a etageres

Country Status (3)

Country Link
AU (1) AU7788000A (fr)
LU (1) LU90463B1 (fr)
WO (1) WO2001031070A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU90812B1 (en) * 2001-08-03 2004-11-10 Wurth Paul Sa Mixer for solid powdery and/or other granular materials.
CN106288773A (zh) * 2016-08-16 2017-01-04 广西联壮科技股份有限公司 一种螺旋型循环式电热陶土煅烧装置
WO2018083059A1 (fr) * 2016-11-02 2018-05-11 Thyssenkrupp Industrial Solutions Ag Four à étages et procédé permettant de faire fonctionner un four à étages
EP3366751A1 (fr) * 2017-02-27 2018-08-29 TSP GmbH Procédé et appareil pour l'oxyation partielle de matériau organique dans une alimentation pulverisée

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190912766A (en) * 1909-05-29 1909-11-25 Utley Wedge Improved Means for Charging Roasting and other Furnaces.
FR457310A (fr) * 1912-03-22 1913-09-16 Chemische Ind Aktien Ges Chargeur automatique pour fours de grillage et autres
NL419C (nl) * 1912-06-06 1915-02-15 Marcke De Lumen Van Maurice Scherm tot het tegengaan van vliegstof voor mechanische roostovens, met naar beneden schuinaflopende doorglijopeningen voor het roosten van pyrite en andere zwavelverbindingen
US2511281A (en) * 1945-05-03 1950-06-13 Warren S Martin Apparatus for converting material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190912766A (en) * 1909-05-29 1909-11-25 Utley Wedge Improved Means for Charging Roasting and other Furnaces.
FR457310A (fr) * 1912-03-22 1913-09-16 Chemische Ind Aktien Ges Chargeur automatique pour fours de grillage et autres
NL419C (nl) * 1912-06-06 1915-02-15 Marcke De Lumen Van Maurice Scherm tot het tegengaan van vliegstof voor mechanische roostovens, met naar beneden schuinaflopende doorglijopeningen voor het roosten van pyrite en andere zwavelverbindingen
US2511281A (en) * 1945-05-03 1950-06-13 Warren S Martin Apparatus for converting material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU90812B1 (en) * 2001-08-03 2004-11-10 Wurth Paul Sa Mixer for solid powdery and/or other granular materials.
CN106288773A (zh) * 2016-08-16 2017-01-04 广西联壮科技股份有限公司 一种螺旋型循环式电热陶土煅烧装置
WO2018083059A1 (fr) * 2016-11-02 2018-05-11 Thyssenkrupp Industrial Solutions Ag Four à étages et procédé permettant de faire fonctionner un four à étages
EP3366751A1 (fr) * 2017-02-27 2018-08-29 TSP GmbH Procédé et appareil pour l'oxyation partielle de matériau organique dans une alimentation pulverisée

Also Published As

Publication number Publication date
AU7788000A (en) 2001-05-08
LU90463B1 (de) 2001-04-26

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