EP1568789A1 - Verfahren und Einrichtung zum Absaugen des Staubes von Metalschmelzepfanne - Google Patents

Verfahren und Einrichtung zum Absaugen des Staubes von Metalschmelzepfanne Download PDF

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Publication number
EP1568789A1
EP1568789A1 EP04100722A EP04100722A EP1568789A1 EP 1568789 A1 EP1568789 A1 EP 1568789A1 EP 04100722 A EP04100722 A EP 04100722A EP 04100722 A EP04100722 A EP 04100722A EP 1568789 A1 EP1568789 A1 EP 1568789A1
Authority
EP
European Patent Office
Prior art keywords
passage
dust
metallurgical vessel
movable
cover structure
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.)
Withdrawn
Application number
EP04100722A
Other languages
English (en)
French (fr)
Inventor
Emile Lonardi
Jeff Mersch
Bernard Gramczewski
Dominique Rocchi
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 EP04100722A priority Critical patent/EP1568789A1/de
Priority to PCT/EP2005/050062 priority patent/WO2005080611A1/fr
Publication of EP1568789A1 publication Critical patent/EP1568789A1/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust

Definitions

  • the present invention generally relates to an extractor hood for a pocket of liquid metal and a gas and dust extraction process during the treatment of liquid metal in the pocket.
  • the metal e.g. of steel
  • the metal liquid contained in the pocket is subjected to different treatments in a confined area, bounded by the bell dipping into the liquid metal.
  • a bubbling gas is injected into the liquid metal to homogenize during the treatment.
  • One type of known extractor hood includes a cover structure dimensioned so as to extend above the opening of the pocket. Suction means are associated with the cover structure for extract the gases from the metallurgical vessel out of the lid.
  • the hood comprises a movable cover portion mounted in a substantially vertically arranged in the structure forming a lid, and is adjustable vertically in this passage.
  • the movable lid portion has a opening through which the bell passes through the hood cover to reach the metal bath contained in the pocket. This moving lid part is lowered to the pocket when you dip the bell in the bath.
  • a game is provided between the part of movable cover and the passage of the cover structure. Seen the dimensions of such an installation and the conditions of severe use, a game relatively important is necessary, typically of the order of several centimeters.
  • the object of the present invention is to provide an improved extractor hood for a metallurgical vessel such as a pocket, having a minimum leakage of gas and dust through the play of the mobile lid seal. Consistent to the invention, this objective is achieved by a suction hood according to the claim 1.
  • the extractor hood comprises, at the level of a recovery zone between the passage and the movable lid portion, means for deflecting the gases and / or dust in order to deflect gases and / or dust likely to escape by the play of the movable lid part.
  • gas leaks and / or dust are considerably reduced or even eliminated by creating a gas diversion at the very spot where they could would escape. This does not obstruct the play of the lid part mobile, while minimizing gas and dust leakage to the outside.
  • Another advantage of the present invention is that it reduces the suction power required. Indeed, it is no longer necessary to establish a depression as important as in conventional extractor hoods to prevent leakage by the play of the movable lid part. Reducing the depression under the hood, it decreases the volume of air flowing above liquid metal in the pouch, and thus reduces the risk of nitriding of the metal bath.
  • This deviation of gases and dust is preferentially means of suction of gas and / or dust at the level of the zone recovery. Gas and dust engaging in the space of the game of the part of the mobile cover are thus sucked and thus deviated from their path in this space, and do not escape into the atmosphere.
  • the deviation of gases and dusts from metallurgical vessel by means of gas blowing.
  • a gas for example air
  • a gas curtain is created which prevents the rise of gases and dusts by the play of the mobile lid part.
  • the deflection means are preferably provided in the lower part of the passage in the cover structure.
  • the passage in the structure forming lid is defined by substantially vertical walls extending over a predetermined height.
  • the movable lid portion includes walls cooperating with the walls of the passage to define the game.
  • This variant is designed so that whatever the position of the moving lid part in the passage, there is overlap between a lower part of the walls of the passage and the walls of the moving part.
  • the means allowing the blowing or aspiration then comprise a series of orifices opening in this lower part of the walls of said passage to ensure the diversion gases and / or dust by suction or blowing. It should be noted that, due covering, the peripheral walls of the movable lid part are always face holes in the lower part of the passage. This allows a greater efficiency of the deflection means which act so in the game space.
  • the orifices are connected to suction means.
  • the orifices are connected to the means associated with the cover structure for sucking gas and / or dust.
  • the channels are connected to a compressed gas supply, eg. of compressed air.
  • the lid structure extends over a corresponding surface at least that of the opening of the metallurgical vessel.
  • Evacuation of gases and dust out of the structure forming a cover is preferably done by at least one suction line opening into the collection volume defined by the cover structure and connected to suction means.
  • This extractor hood is usable in a variety of applications liquid metal treatment in a pocket, and in particular with a device for liquid metal treatment comprising a fixed or rotary bell, or a tube.
  • a device for liquid metal treatment comprising a fixed or rotary bell, or a tube.
  • the opening in the movable lid part is therefore advantageously provided for the passage of such a device.
  • a suction method of gas and / or dust during the treatment of liquid metal in a container metallurgical material such as a ladle in which the metallurgical vessel is placed under a fume hood.
  • the extractor hood includes a structure forming a cover sized to extend over the opening metallurgical vessel and provided with a passage.
  • a moving lid part is associated with the passage and is adjustable therein, a game being provided between the movable lid portion and the passage of the lid structure.
  • the movable lid portion further has an opening for a device processing the metal in the metallurgical vessel. According to the present process, the gases and / or dust from the metallurgical vessel are sucked up out of the lid structure.
  • it will be appreciated that of an area of the passage that overlaps with the movable lid portion creates a deviation of gases and / or dust from the metallurgical vessel.
  • FIG.1 is shown schematically a preferred embodiment of a suction hood 10 according to the invention.
  • a pocket 12 comprising a refractory liner is filled with liquid steel 14 and is placed under the hood aspirant 10 for treating the liquid metal 14 by means of a refractory bell 15 and suck up the gases, fumes and dust that emerge from the pocket 12.
  • the extractor hood 10 comprises a cover structure 16, which is for example fixed to a support structure (not shown).
  • the structure 16 is designed to extend over the opening of the pocket 12.
  • the cover 16 extends over the entire the opening of the pocket 12 to beyond the edges thereof, and is maintained at a certain distance above the upper edges of the pocket 12 leaving an annular space 18.
  • the cover 16 comprises a wall substantially horizontal 20 bordered by a vertical peripheral wall 22, defining thus a collection volume 24.
  • the cover 16 comprises a passage 28 which is associated with a portion movable lid 30 which is vertically adjustable in this passage 28.
  • the passage 28 is defined by substantially vertical walls 29, which extend on a predetermined height.
  • the movable lid portion 30 is provided an opening 32 through which passes the supply duct 34 of the bell 15, through which the combustible materials, alloying elements or other materials for the treatment of liquid steel 14.
  • the bell 15 Depending on the level of filling of the pocket 12, the bell 15 must be more or less lowered in the pocket 12 under the hood 10, so that the lower edge of the bell 15 dips into the liquid steel 14 (as shown in Fig.1). In the positioning maneuver of the bell 15, one adjusts also the position of the movable lid portion 30, which typically follows the vertical displacement of the bell 15.
  • a relatively large clearance 36 is provided, the order of a few centimeters, at the periphery of the moving lid part 30.
  • the extractor hood 10 comprises a means of gas deflection, at a recovery zone between the movable lid part 30 and the passage 28, which here corresponds to the part of the passage 28. This deflection of the gases is preferably carried out by suction at the level of the overlap area.
  • the movable cover 30 comprises a wall substantially horizontal 38 whose area corresponds to that of the section of the passage 28, which is bordered by vertical peripheral walls 40.
  • the movable lid portion 30 is shown in its lower position; in the high position, the horizontal walls 20, respectively 38, of the parts mobile 30 and fixed 16 are at the same level. It will therefore be understood that whatever the position of the movable part 30 in the passage 28, there is a covering between the lower part of the passage 28 and a wall portion mobile lid device 30.
  • the suction is carried out by a series of orifices 42 provided in the lower part of the passage 28 where there is recovery.
  • These holes 42 at the outlet in the passage 28 and are connected by a suction pipe 44 that can be in communication with the same means of aspiration than those used for the suction by the pipes 26.
  • the gases, fumes or dust that could engage in the game 36 of the lid part 30 are deflected and discharged through the orifices 42, thus avoiding escape into the atmosphere.
  • Figs. 2 and 3 illustrate in detail a preferred embodiment of a cover structure 100.
  • the cover structure 100 comprises a horizontal wall 102 and vertical peripheral walls 104.
  • openings 106 to suck the gases and dust out of the lid 100.
  • auxiliary lines 105 themselves connected to a main suction line 107.
  • the cover structure 100 includes a passage 108 defined by vertical walls 110, which is associated with the movable lid portion 112, schematically illustrated out of the passage 108 in Fig.2.
  • the part of movable cover 112 comprises a horizontal wall 114 provided with walls vertical peripherals 116 which cooperate with the walls 110 of the passage 108 to define a set of movable cover 112.
  • the movable part is adjustable vertically in the passage 108 between a high position, in which the horizontal walls 102 and 114 of the fixed and movable parts 100 and 112 are at same level, and a low position, in which the part of mobile cover 112 in the fixed part 100, in the defined collection space by the horizontal wall 102 and the walls 104. It will be noted that in operation, there is still overlap between the lower part of the passage 108 and the walls of the movable lid portion 112, regardless of the position of the latter with respect to the passage 108.
  • the lower part passage 108 is provided with a series of orifices 118 which open in the passage 108. Outside the passage, all its openings are connected by a pipe 120, which is itself connected to the suction pipe 107.
  • This series of ports therefore allows a diversion of gases by suction at the lower part of the passage 108, where there is overlap with the movable lid portion 112, regardless of the position of the latter.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
EP04100722A 2004-02-24 2004-02-24 Verfahren und Einrichtung zum Absaugen des Staubes von Metalschmelzepfanne Withdrawn EP1568789A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04100722A EP1568789A1 (de) 2004-02-24 2004-02-24 Verfahren und Einrichtung zum Absaugen des Staubes von Metalschmelzepfanne
PCT/EP2005/050062 WO2005080611A1 (fr) 2004-02-24 2005-01-07 Hotte aspirante pour poche de metal liquide et procede d'aspiration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04100722A EP1568789A1 (de) 2004-02-24 2004-02-24 Verfahren und Einrichtung zum Absaugen des Staubes von Metalschmelzepfanne

Publications (1)

Publication Number Publication Date
EP1568789A1 true EP1568789A1 (de) 2005-08-31

Family

ID=34746061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04100722A Withdrawn EP1568789A1 (de) 2004-02-24 2004-02-24 Verfahren und Einrichtung zum Absaugen des Staubes von Metalschmelzepfanne

Country Status (2)

Country Link
EP (1) EP1568789A1 (de)
WO (1) WO2005080611A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE658726C (de) * 1936-09-23 1938-04-09 Hartmann Akt Ges Maschf Entstaubungsanlage, insbesondere fuer elektrische OEfen
DE1284435B (de) * 1961-09-01 1968-12-05 Demag Ag Verfahren und Vorrichtung zum Absaugen von Konverterabgasen
US3453946A (en) * 1967-09-11 1969-07-08 Claude B Schneible Co Exhaust cap apparatus
JPH0455688A (ja) * 1990-06-25 1992-02-24 Kawasaki Steel Corp 電気炉の建屋集塵装置
JPH04186088A (ja) * 1990-11-20 1992-07-02 Kobe Steel Ltd 集塵フードにおける電極挿通孔用シール装置
JP2000111271A (ja) * 1998-10-09 2000-04-18 Fuji Electric Co Ltd 金属溶解炉

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE658726C (de) * 1936-09-23 1938-04-09 Hartmann Akt Ges Maschf Entstaubungsanlage, insbesondere fuer elektrische OEfen
DE1284435B (de) * 1961-09-01 1968-12-05 Demag Ag Verfahren und Vorrichtung zum Absaugen von Konverterabgasen
US3453946A (en) * 1967-09-11 1969-07-08 Claude B Schneible Co Exhaust cap apparatus
JPH0455688A (ja) * 1990-06-25 1992-02-24 Kawasaki Steel Corp 電気炉の建屋集塵装置
JPH04186088A (ja) * 1990-11-20 1992-07-02 Kobe Steel Ltd 集塵フードにおける電極挿通孔用シール装置
JP2000111271A (ja) * 1998-10-09 2000-04-18 Fuji Electric Co Ltd 金属溶解炉

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 248 (M - 1261) 5 June 1992 (1992-06-05) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 507 (M - 1327) 20 October 1992 (1992-10-20) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 07 29 September 2000 (2000-09-29) *

Also Published As

Publication number Publication date
WO2005080611A1 (fr) 2005-09-01

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