US3601379A - Cooling structure for a metallurgical furnace - Google Patents

Cooling structure for a metallurgical furnace Download PDF

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Publication number
US3601379A
US3601379A US819322A US3601379DA US3601379A US 3601379 A US3601379 A US 3601379A US 819322 A US819322 A US 819322A US 3601379D A US3601379D A US 3601379DA US 3601379 A US3601379 A US 3601379A
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US
United States
Prior art keywords
conduits
vessel
groups
wall
distributor
Prior art date
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Expired - Lifetime
Application number
US819322A
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English (en)
Inventor
Karlheinz Langlitz
Wolfgang Jansa
Karl Heinrich Mahringer
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Mannesmann Demag AG
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Demag AG
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Publication date
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    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4646—Cooling arrangements

Definitions

  • a metallurgical vessel includes a cylindrical portion which is supported on a ring carrying a tilting spindle which is mounted for pivotal tilting movement of the vessel.
  • the vessel includes a frustoconical mouth portion at its upper end which terminates in a mouth ring of reinforced construction.
  • the construction includes a cooling arrangement for the mouth portion which comprises a plurality of groups of coils which are wound around the mouth portion and which are advantageously wound in the form of a multistart screw thread.
  • Each group of coils includes an inlet and an outlet which is connected to a distributor through suitable valves.
  • This distributor in turn is connected through a main distribution pipe which extends through an opening in the tilting ring and the tilting spindle and is connected to a source of fluid cooling medium through a rotary seal at the outer end of the tilting spindle.
  • This invention relates, in general, to the construction of a metallurgical vessel, and in particular, to a new and'useful steel mill converter having a wall whichis partly hollow or which includes a plurality of cooling tubes therein which are connected to a common cooling fluid medium distributor.
  • Metallurgical vessels are subjected to natural stresses by the heat of their molten liquid content. The heat will flow through the masonry lining and reach a particular magnitude in some smelting processes.
  • the carbon oxide gas stemming from the refining operation leads to an after burning of the waste gases particularly inside the vessel due to an excess in the supply of oxygen.
  • the melting of the lining and the costs of operation in which many changes occur permits a considerable amount of heat to enter the shell of the I walls are known.
  • the vessel can be equipped with a double wall at least in the area of the mouthwhereby the coolant is conducted through the tilting spindle itself. Double walls are not only hard to manufacture, they are very expensive.
  • the vessel wall is formed of tubes through which a coolant flows. Even if the basic shape of the vessel is assembled of individual subassemblies, there still remains a problem of imposing upon the joints between two adjacent tube rings the weight of the masonry lining and the vessel payload. Such a joint, produced by rubbing,
  • mouth rings which are disposed so that there is an air gap between the rings and the shell of the vessel.
  • a hollow space is provided in the interior of the mouth rings through which cooling water is conducted to dissipate any heat from the mouth area which may develop by heat conduction.
  • Mouth rings are cooled not only to protect the vessel, but rather to prevent too firm a connection of what is ejected from the converter with the shell of the vessel. Cracking of the ov'erstressed mouth rings is prevented by forming the ring of segments which are of a special cast material. Therefore, each of the mouth ring segments require pipelines for the supply and the drainage of cooling water.
  • the drawbacks of the prior art are eliminated in respect to the unsafe locations of the cooling coils and the locating of the cooling coils adjacent the mouth portion of the vessel so that in the case of damage, neither the cooling effect need not be interrupted nor the vessel be put out of operation during the metallurgical process.
  • the inlets and the outlets of the several cooling coils are connected to a common coolant distributor. When one coil fails, the others will remain functional.
  • two or more groups of coils are separately connected at their inlets to an inlet distributor and at their outlets to an outlet distributor.
  • the distributor advantageously includes a cutoff valve for each coil so that the drainage of the coolant can be stopped immediately if there is a failure of one of the coils. This is a very important arrangement because, in practice, parts of the charging equipment bump against the vessel over and over again, and it must be considered that during the removal of the converter slag there will be considerable bumping of the mouth area during the transportation of the vessel.
  • the cooling coils are advantageously installed so that each individual cooling coil runs around the vessel in one or several windings with a spacing between coils.
  • the layout for example, may comprise a form of a so-called multistart screw thread.
  • the arrangement of the cooling coils inaccordance with the invention permits the coils to be subjected to a much more intensive cooling action.
  • a double wall construction is used for cooling a vessel, there is a danger of local overheating due to lack of a sufficiently rapid heat transfer from the heated part to the coolant.
  • this disadvantageous effect is eliminated and the arrangement goes hand in hand with the operational requirements.
  • the cooling coils are advantageously provided by a half tubular element which is fitted directly to the exterior wall of the vessel mouth portion, so that the vessel wall, together with the half portion of the tube, defines the individual cooling flow channel.
  • the coolant is in direct contact with the wall of the part of the vessel to be cooled.
  • the heat transfer resistance of the coolant is correspondingly lower.
  • the half tubular elements can be easily welded to the vessel using welding seams which are always accessible and which can be rewelded over and over again without having a breakdown in operations. The arrangement is such that the operator can perform such jobs reliably without outside help.
  • the invention provides an improved means for connecting the coolant lines to a source of coolant using improved cooled fittings.
  • a clear and easily accessible arrangement is provided by extending the ends of the cooling coils around the mouth cap of the steel mill converter to a distributor which is disposed in the area of the converter carrying ring, so that the distributor may be connected to a coolant main line which extends through the carrying hol- 7 low tilting spindle.
  • an expansion compensator located between the carrying ring and the distributor on the vessel. Such a compensator bridges the connection between the carrying ring and the vessel to accommodate different heat expansions of these two parts in several directions.
  • the invention is particularly application for metallurgical converters which must be tilted for emptying or for other purposes.
  • a rotary seal at the outlet end of the tilting spindle serves as a connection between the main line and a fixed coolant removal station adjacent the mounting for the spindle.
  • Rotary seals can be made to require little service for high pressures and long operating periods. Accordingly, this arrangement represents a solution adaptable to the low conditions.
  • a further object of the invention is to provide a metallurgical vessel construction which includes a cylindrical portion suspended on a lifting ring carrying a pivotal spindle member and including a frustoconical mouth portion having a plurality of cooling coils wound there around arranged in cooling coil circuits, each of which includes coils which are'located adjacent a coil in another circuit, the coils being connected to a distributor and through a connecting coolant fluid main which extends through the hollow tilting spindle.
  • a further object of the invention is to provide a metallurgical vessel with cooling channels defined by the vessel wall and by half-cylindrical tubes welded to the vessel wall.
  • a further object of the invention is to provide a metallurgical vessel construction which is simple in design, rugged in construction and economical to manufacture.
  • FIG. 1 is a partial side elevational view of a metallurgical vessel constructed in accordance with the invention.
  • FIG. 2 is an axial sectional view of the portion of the vessel indicated in FIG. 1.
  • the invention embodied therein comprises a metallurgical vessel generally designated having a mouth ring 2 located at the top of a frustoconical mouth cap 3.
  • the mouth cap 3 is secured to the upper end of a cylindrical part 4 which is supported within a carrying ring 6.
  • the carrying ring 6 has a tilting spindle 7 which is suitably mounted in means (not shown) for permitting the tilting or pivotal movement of the ring with the vessel.
  • the mouth ring 2 may be made of a heat-resistant material and is dimensioned sufficiently to provide sufficient strength at this location.
  • the cap can be formed only to a thickness which can be easily achieved with the available machinery.
  • a greater thickness of a cap 3 brings substantially no advantages because of the great heat tensions to which this part is subjected.
  • the mouth cap 3 is cooled by a system of cooling coils 8 which are arranged around and in contact with the exterior surface thereof and this enables the utilization of the natural material strength of this part of the vessel.
  • each of the cooling coils 8 has about from 3 to 4 windings 11.
  • Each circuit is laid out so that it has a winding of another circuit directly on each side thereof and this arrangement is achieved, for example, by laying the tubular conduits in a manner of a multistart screw thread.
  • the distance 12 indicated in FIG. 2, between two adjacent winding 11 may be reduced by the interposition of additional cooling coils 8 to thereby increase the number of starts and the cooling output.
  • a feature of the construction is the formulation of the cooling coils which, in the embodiment illustrated, comprises a half tubular portion 13 which is closed by a shell portion 14 of the wall or shell 14 of the mouth cap 3.
  • the half tubular portion may be joined by external welding seams to the wall 14 or by the use of special process by which a press fit is established continuously by electric induction heating which may be carried out in a protective atmosphere.
  • the distributor 9 is connected by a main supply line 15 which leads through an opening 16 in the carrying ring 6 and extends through the hollow tilting spindle 7 to a fixed coolant removal station (not shown).
  • the main line 15 communicates with the fixed coolant station through a rotary seal (not shown) so that it does not interfere with the tilting movement of the vessel and its supporting spindle 7.
  • the distributor 9 is fastened to the reinforcing rings 18 and 19 which are carried on the cylindrical portion 4 of the vessel 5. Heat expansion between the carrying ring 6 and the vessel 5 are bridged by heat expansion compensator 17 which interconnects-the portions of the main conduit 15 at this bridging location.
  • Shutoff valves 20 are provided for each cooling coil circuit which consists of several windings 11. Accordingly, the implementation which is shown includes eight independent cooling coil circuits and a corresponding number of shutoff valves 20.
  • the principal of the use of independent cooling coils 8 arranged in groups or circuits can be applied to a multiplicity of designs.
  • the main line 15 can be equipped, for instance, with additional distributors 9 all around the carrying ring 6.
  • the invention is also applicable to other types of furnaces or vessels which have no round cross section.
  • the cooling coils 8 may take the course approximately in the direction of the longitudinal centerline of the vessel to provide, for example, curve-simulating garlands.
  • the pivot pin 7 is supported on a pivot bearing 21, which is mounted on a foundation 31.
  • the pivot pin 7- is hollow, as indicated in the drawings and it carries a rotary packing 22 at its outer end.
  • the rotary packing 22 comprises a tube 23, which is connected with the pivot pin 7 and which terminates in a flanged ring 24.
  • the flanged ring 24 bears against a nonrotating flanged ring 25 of about the same size.
  • a packing ring 26 is inserted between the two flanged rings 24 and rotatably mounted in the housing 28 and these two parts form the rotary packing.
  • the connecting tube for the outflow of liquid is secured to the housing 28 and it opens into the main line 30, which is fed from lines in the interior ofthe foundation 31.
  • a metallurgical vessel construction comprising a vessel having an exterior wall which is subjected to high temperatures, a plurality of groups of coolant conduits positioned at a plurality of locations over said wall to cover at least a portion of a defined area of said wall for cooling said wall, a separate coolant supply for each conduit, each of said groups including a plurality of separate coolant conduits and each conduit being connected to a respective one of said coolant supply, and said conduits of each of said groups being located alongside each other in each location so that there is always one of said separate coolant conduits located adjacent each other so that both cover and adjacent area of said wall, whereby at least one of said conduits will be effective in each groups even though another of said conduits is ruptured or disconnected from its coolant supply.
  • a metallurgical vessel including a distributor for connecting said groups of said conduits to said fluid coolant supply, each of said groups of conduits being connected to said distributor.
  • a metallurgical vessel wherein said groups of conduits comprise at least three separate conduits wound continuously around said wall, said wall being tubular and said conduits being in closely spaced side-by-side relationship.
  • a metallurgical vessel construction comprising a vessel having an exterior wall, a plurality of groups of conduits defined over said wall with at least one of. the conduits of one group being adjacent at least one of the conduits of another group, means for connecting said groups of conduits to a fluid coolant, said conduits comprising a partial tubular wall portion located over said vessel, said vessel wall closing said partial tubular conduit.
  • a metallurgical vessel according toclaim 6 wherein said means for connecting said groups of conduits to a fluid coolant comprises a conduit extending through said hollow tilt spindle.
  • a metallurgical vessel including a distributor carried on said vessel, each of said groups of conduits being separately connected to said distributor, a main conduit connected to said distributor, valve means between said distributor and each of said groups of conduits.
  • a metallurgical vessel according to claim 9, wherein said main conduit extends through hollow spindle and is adapted to beconnected to a station fluid coolant supply said main conduit having an expansion portion therein located between said supporting ring and said vessel.
  • a metallurgical vessel including a rotary seal adjacent said hollow tilt spindle for connecting said main conduit to a fluid coolant.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Heat Treatment Of Articles (AREA)
US819322A 1968-06-27 1969-04-25 Cooling structure for a metallurgical furnace Expired - Lifetime US3601379A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681758562 DE1758562B1 (de) 1968-06-27 1968-06-27 Metallurgisches Gefaess,insbesondere Stahlwerkskonverter

Publications (1)

Publication Number Publication Date
US3601379A true US3601379A (en) 1971-08-24

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ID=5695114

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Application Number Title Priority Date Filing Date
US819322A Expired - Lifetime US3601379A (en) 1968-06-27 1969-04-25 Cooling structure for a metallurgical furnace
US06/069,189 Expired - Lifetime USRE31566E (en) 1968-06-27 1979-08-23 Cooling structure for a metallurgical furnace

Family Applications After (1)

Application Number Title Priority Date Filing Date
US06/069,189 Expired - Lifetime USRE31566E (en) 1968-06-27 1979-08-23 Cooling structure for a metallurgical furnace

Country Status (7)

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US (2) US3601379A (ro)
JP (1) JPS495802B1 (ro)
BE (1) BE725341A (ro)
CA (1) CA932528A (ro)
DE (1) DE1758562B1 (ro)
FR (1) FR1598394A (ro)
GB (1) GB1274517A (ro)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963223A (en) * 1973-07-23 1976-06-15 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Metallurgical vessel, in particular a converter
DE2805263A1 (de) * 1977-02-08 1978-08-17 Daido Steel Co Ltd Wassergekuehlter ofendeckel
US5853656A (en) * 1997-07-08 1998-12-29 Bethlehem Steel Corporation Apparatus and method for cooling a basic oxygen furnace trunnion ring
EP3412781A1 (de) * 2017-06-08 2018-12-12 SMS Group GmbH Schutzvorrichtung für vakuum-konverter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3333841C1 (de) * 1983-09-20 1984-08-30 Mannesmann AG, 4000 Düsseldorf Metallurgisches Gefaess,insbesondere stationaerer oder auswechselbarer Stahlwerkskonverter
US4936953A (en) 1986-11-26 1990-06-26 John Abbott Cold trap vapor control device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2186740A (en) * 1939-02-17 1940-01-09 Teeters Thomas Furnace construction
US2661200A (en) * 1948-09-16 1953-12-01 Industrikemiska Ab Device in heat exchanger
US3034776A (en) * 1952-02-08 1962-05-15 Lurgi Ges Fur Chemie Und Hutte Rotary furnace

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA555093A (en) * 1958-03-25 Hellwig Hans-Joachim Furnace for simultaneous recovery of colour-metal oxides and copper matte
CA556462A (en) * 1958-04-29 Becker Ernst Apparatus for regulating the wall temperature in the melting zone of cupola furnaces
DE578725C (de) * 1929-08-06 1933-06-16 Oesterr Alpine Montan Vorrichtung zur Kuehlung von Siemens-Martin-OEfen und anderen Flammoefen
US2222004A (en) * 1939-08-03 1940-11-19 Latrobe Electric Steel Company Electric furnace roof construction
DE849853C (de) * 1947-01-22 1952-09-18 Sigurd Nordgren Vorrichtung zum Kuehlen von Schmelz-, Martin- oder elektrischen OEfen, Heizapparaten od. dgl.
DE1103952B (de) * 1955-11-05 1961-04-06 Knapsack Ag Verfahren zum Kuehlen von thermisch besonders hoch beanspruchten Teilen von Industrieoefen, insbesondere von elektrischen OEfen
DE1189098B (de) * 1959-01-15 1965-03-18 Omnical Ges Fuer Kessel Und Ap Tuerkuehlrahmen fuer metallurgische OEfen
FR1357321A (fr) * 1963-03-08 1964-04-03 Siderforni S P A Nouveau procédé de refroidissement du manteau extérieur des convertisseurs à oxygène
DE1458817A1 (de) * 1965-03-08 1969-01-23 Krupp Gmbh Konverter zur Durchfuehrung von Sauerstoff-Aufblasverfahren
FR1473423A (fr) * 1966-03-08 1967-03-17 Beteiligungs & Patentverw Gmbh Convertisseur pour la mise en oeuvre de procédés de soufflage d'oxygène par le haut
DE1961136A1 (de) * 1969-12-05 1971-06-09 Nirona Werke Kg Verfahren und Vorrichtung zur Herstellung von Formkoerpern aus treibmittelhaltigen,thermoplastischen Kunststoffen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2186740A (en) * 1939-02-17 1940-01-09 Teeters Thomas Furnace construction
US2661200A (en) * 1948-09-16 1953-12-01 Industrikemiska Ab Device in heat exchanger
US3034776A (en) * 1952-02-08 1962-05-15 Lurgi Ges Fur Chemie Und Hutte Rotary furnace

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963223A (en) * 1973-07-23 1976-06-15 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Metallurgical vessel, in particular a converter
DE2805263A1 (de) * 1977-02-08 1978-08-17 Daido Steel Co Ltd Wassergekuehlter ofendeckel
US4182610A (en) * 1977-02-08 1980-01-08 Daidotokushuko Kabushikikaisha Water-cooled furnace cover
US5853656A (en) * 1997-07-08 1998-12-29 Bethlehem Steel Corporation Apparatus and method for cooling a basic oxygen furnace trunnion ring
EP3412781A1 (de) * 2017-06-08 2018-12-12 SMS Group GmbH Schutzvorrichtung für vakuum-konverter

Also Published As

Publication number Publication date
BE725341A (ro) 1969-05-16
GB1274517A (en) 1972-05-17
JPS495802B1 (ro) 1974-02-09
USRE31566E (en) 1984-04-24
FR1598394A (ro) 1970-07-06
DE1758562B1 (de) 1972-08-24
CA932528A (en) 1973-08-28

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