Classifications

• • 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
  • F27D11/00—Arrangement of elements for electric heating in or on furnaces
  • F27D11/08—Heating by electric discharge, e.g. arc discharge
  • F27D11/10—Disposition of electrodes
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B7/00—Heating by electric discharge
  • H05B7/02—Details
  • H05B7/06—Electrodes
• • 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
  • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
  • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type 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
  • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
  • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
  • F27B3/19—Arrangements of devices for discharging
• • 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
  • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
  • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces heated electrically, with or without any other source of heat
  • F27B3/085—Arc 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
  • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
  • F27D3/1509—Tapping equipment

Definitions

• the invention relates to a bottom of a metallurgical vessel with a direct current arc device, the cathode of which extends into the vessel and at least one anode is arranged in the refractory lining of the bottom, which at one end touches the metal melt penetrating the vessel wall and at the other end can be connected to cooling fluid supply sources and via Holding elements is electrically insulated attached to the vessel wall.
• a metallurgical vessel is known, with a vessel bottom, which has a refractory lining, in which the bottom electrode one
• a holding device is detachably attached to the jacket of the vessel by insulation.
• the holding device consists of a flange tube arranged coaxially to the center of the electrode, which can be screwed onto the metallurgical vessel.
• the electrode penetrating the furnace wall contacts the melt in the vessel.
• the head area of the electrode is melted during operation. Since this is the lowest point of the furnace vessel in which the melt is located, the thinner and heavier melt components also accumulate here. Defects in the refractory material can lead to connections of the liquid thread between the electrode and the metal jacket of the vessel. The consequence of this is damage or destruction of the furnace vessel in the area of the bottom electrode by electrical flashovers.
• the invention has set itself the goal of creating a bottom of a metallurgical vessel with a direct current arc device, in which the occurrence of electrical flashovers in the bottom of the vessel is prevented by simple design means.
• Furnace vessel designed as a drain channel.
• a sleeve is provided which envelops the part of the anode projecting into the vessel and is at a distance from it that low-melting metals can flow out of the vessel without hindrance.
• the sleeve is made of a material that does not conduct electricity, preferably ceramic.
• the head of the sleeve facing the interior of the vessel is designed as a collecting screen and has a conically diverging shape.
• the sleeve consists of at least two parts, the first part being cylindrical and the second part having a conically opening funnel shape from a separation point in the direction of the interior of the vessel.
• a sleeve made of a refractory ramming mass 42 is provided in the refractory lining 41 and extends in the extension of the funnel-shaped second part 35 of the sleeve 31.
• the sleeve constructed from ramming mass 42 fulfills the function of a drainage and ensures that even with greater wear of the anode 21, all of the low-viscosity metal is conducted to the sleeve 31.
• Holding element of the anode and the sleeve is 0.5 to 2 mm. This distance is sufficient to prevent the usual melt from flowing out of the bottom of the vessel.
• a collecting device is arranged beneath the floor to collect the thin-flowing metal, such as lead, which flows off via the drainage channel.
• the anode is held by a clamping ring separated by insulation, which is arranged below the furnace floor.
• the insulation is held in a form-fitting manner from the furnace bottom as a simple ring and is spaced at a distance from the anode which forms a discharge channel.
• FIG. 1 An example of the invention is shown in FIG. 1.
• An opening 13 is provided in the metallic base 12 of the metallurgical vessel 11, not shown, through which an anode 21 is guided.
• the anode 21 penetrates the refractory lining 41 to such an extent that it contacts the melt which can be filled into the vessel 11.
• the anode 21 is held by a holding element 24, which has a clamping ring 29, by means of which the anode 21 is separated via an insulating spacer 61 and is thus held.
• the anode 21 has a step 23, which corresponds to a holding element 24, which is tubular and has a flange 27, which is fastened to the vessel bottom 12 by means of holding screws 28.
• the flange 27 is electrically nonconductively connected to the metallic part of the metallurgical vessel 11 by insulating spacing 61 and a screw insulation 62.
• the anode 21 is water-cooled and has a cooling medium supply 51 and a cooling medium discharge 52. Furthermore, it is electrically connected to a power connection 22.
• This sleeve 31 is constructed from the material that is not electrically conductive and has an inner radius R H that has a distance ⁇ r of 0.5 to 2 mm from the radius R A bearing the distance between the outer radius of the anode and the holding element 24 holding the anode .
• This annular drain channel 37 can flow out of thin metal from the metallurgical vessel.
• the sleeve 31 is constructed in one piece and held positively by the bottom 12.
• the sleeve 31 is constructed in two pieces and has a first part 34 with a cylindrical shape and a second part 35 which is designed as a funnel.
• a refractory ramming mass 42 which is formed as a sleeve-shaped drainage in the refractory lining 41 of the base 12 in the metallurgical vessel 11.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Plasma & Fusion (AREA)
• Vertical, Hearth, Or Arc Furnaces (AREA)
• Furnace Details (AREA)
• Discharge Heating (AREA)
• Crucibles And Fluidized-Bed Furnaces (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7863606

Family Applications (1)

Country Status (14)

Families Citing this family (1)

Family Cites Families (6)

• 1998
  • 1998-03-27 DE DE19815154A patent/DE19815154C1/de not_active Expired - Fee Related
• 1999
  • 1999-03-03 JP JP2000541853A patent/JP2002510786A/ja active Pending
  • 1999-03-03 TR TR2000/02763T patent/TR200002763T2/xx unknown
  • 1999-03-03 SK SK1420-2000A patent/SK14202000A3/sk unknown
  • 1999-03-03 CA CA002326181A patent/CA2326181A1/fr not_active Abandoned
  • 1999-03-03 EP EP99916773A patent/EP1066737B1/fr not_active Expired - Lifetime
  • 1999-03-03 KR KR1020007010592A patent/KR20010034658A/ko not_active Withdrawn
  • 1999-03-03 BR BR9909144-5A patent/BR9909144A/pt not_active IP Right Cessation
  • 1999-03-03 AU AU35155/99A patent/AU3515599A/en not_active Abandoned
  • 1999-03-03 DE DE59902756T patent/DE59902756D1/de not_active Expired - Lifetime
  • 1999-03-03 US US09/647,208 patent/US6485675B1/en not_active Expired - Fee Related
  • 1999-03-03 CN CN99804500A patent/CN1295779A/zh active Pending
  • 1999-03-03 ES ES99916773T patent/ES2184436T3/es not_active Expired - Lifetime
  • 1999-03-03 WO PCT/DE1999/000631 patent/WO1999051065A2/fr not_active Ceased
  • 1999-03-03 AT AT99916773T patent/ATE224632T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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