US3811386A - Tuyere for introducing oxygen and a protective medium into converter vessels - Google Patents

Tuyere for introducing oxygen and a protective medium into converter vessels Download PDF

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Publication number
US3811386A
US3811386A US00313377A US31337772A US3811386A US 3811386 A US3811386 A US 3811386A US 00313377 A US00313377 A US 00313377A US 31337772 A US31337772 A US 31337772A US 3811386 A US3811386 A US 3811386A
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United States
Prior art keywords
tuyere
pipe
protective medium
supply
sealing rings
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Expired - Lifetime
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US00313377A
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English (en)
Inventor
H Knuppel
K Brotzmann
H Fassbinder
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.)
Eisenwerke Gesellschaf Maximilianshuette mbH
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Eisenwerke Gesellschaf Maximilianshuette mbH
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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
    • C21C5/48—Bottoms or tuyéres of converters

Definitions

  • the annular space separation is approximately 1 mm and is maintained by spacers between the two tubes, for instance by inner ribs on the outer tubes.
  • liquid or gaseous hydrocarbons more particularly light fuel-oil, propane or natural gas, are used as protective media for the oxygen jet so as to reduce tuyere burn-off and wear of the refractorymasonry.
  • the concentric arrangement of the tuyere tubes passing through the refractory masonry into the refining vessel and terminating below the bath surface is achieved in fairly simple manner by 'using spacers between the inner and outer tubes.
  • spacers may consist of coils brazed or welded on the-inner tube, or they may be outer ribs on the inner tube or inner ribs on the outer tube, or evenly distributed point-like elevations on either tube.
  • Supplying the two gases is effected by a consolidated supply system sub-divided into two chambers.
  • This solution may lead to the undesirable mixing of the two gases in case of leaks.
  • introducing a combustible protective medium through the annular space and oxygen through the refining gas tube may lead to dangerous fires and to explosions if there is a leak in the supply system.
  • sealing means made of organic and elastic materials such as rubber have been found unsuitable for usual converter operations, because impurities may damage the seals and because they are'insufficiently temperature resistant.
  • the present invention proceeds from the consideration that high technical requirements together with easy handling under rough steelmaking operations must be met with .respect to feeding the two fluids to the tuyeres made of two concentric a. the inner tuyere tube should be easily removable and interchangeable for the purpose of monitoring its remaining length;
  • any seals utilized must be operational at least up to temperatures of 300 C and may not consist of soft, organic materials.
  • the improved device of the present invention consists of a tuyere in which an oxygen-containing gas flows through the inner duct and the hydrocarbo-' naceous medium flows through the outer duct, and wherein the two media for the inner and outer ducts are so supplied as to'be spatially isolated from one another and the seals are fundamentally only in contact with ambient, so that sealing of both media with respect to each other is avoided. Sealing is achieved by metallic components such as conical and wedge rings and the like which are not susceptible to the temperature instability of rubber and other organic seals.
  • FIG. 1 is a longitudinal section through a tuyere con sisting of two concentric tubes in which the refining gas and the protective medium are supplied according to the invention
  • HO. 2 is a cross-section through the dual concentric tube tuyere of FIG. I;
  • FIG. 3 is a longitudinal section similar to FIG. 1 showing the connections of both tuyere ducts to their supply lines.
  • the tuyere for the refining gas and for one protective medium consists of two concentric tubes 1 and 2.
  • the outer tube 1 may be made of any suitable material such as ordinary steel, copper or high grade steel.
  • the outer tube 1 is provided with inner l8 3 which serve as spacers for the inner tube 2.
  • Outer tube 1 is inserted into the inner converter space through a bore hole'4 in the converter jacket 5 and further passes through refractory masonry 6.
  • steel member 5 may be 34 converter bottom plate and tube 1 may be pressed into the refractory bottom lining.
  • a welded flange 7 serves as a stop for outer tube 1 and for securing it to the steel plates.
  • outer tube 1 may be rigidly connected by such fasteners as bolts to the steel plate 5 of the refining vessel.
  • the outer tuyere tube 1 terminates outside the steel jacket directly below a seal 9.
  • the inner tuyere tube 2 provided for passage of the refining gas into the converter and below bath surface, is inserted into the outer tuyere tube 1 which is provided with inner ribs.
  • One particularly preferred inner tuyere tube material is a high-grade stainless steel with 18 percent Cr and percent Ni. However, other metals such as copper or steels differently alloyed may be used. In one installation, the dimensions of the tuyere tubes was as follows: 1
  • inner tube 2 is longer than outer tube 1, because,'although both tuyere tubes terminate at the converter inner side, inner tube 2 extends beyond outer tube 1 at the converter outer side. A suitable difference in length is 150 mm in the installation shown.
  • a sleeve 10 is brazed or welded to inner tube 2.
  • Feed tube 14 for the liquid or gaseous protective medium is welded into the bolting connector 13.
  • clamping nut 15 and sealing ring 16 seal off inner tube 2 with respect to the ring space 12.
  • the lengths of the bolting connector 13 and of sleeve 10, which is brazed on the inner tube, thereby determine the shifting latitude of the inner tube in the longitudinal direction. In the present installation the shifting latitude amounts to about 25 mm.
  • a threaded joint between refining gas supply line 17 and inner tube 2 is located below the protective medium supply line and the sealing elements of the latter.
  • Clamping nut 18 together with the metallic sealing ring 19 serve as a seal of the refining gas feed line with respect to the inner tube. Because of the separation of the protective medium and refining gas sealing elements, there can be no undesirable mixing of these media in case of leaks, since individually they aresealed only with respect to the ambient atmosphere and not with respect to each other.
  • the spacing between the two feed lines is only determined by the extension in length of the inner tube. Theoretically, the latter length may be selected at will, but there are limits on mechanical grounds; in the converter shown, the clear spacing 20 between the sealing elements amounts to about 150 mm.
  • Suitable fittings are provided between the gas or protective medium supply to the corresponding tuyere ducts and its connection to the associated supply lines, which serve to compensate dimensional inaccuracies when fitting the tuyere feed lines to the supply lines.
  • the ring space 12 In order to connect the ring space 12 with the protective medium supply line 21, ordinarily straight and angular connecting pieces, and the displacement possibilities provided by these, will suffice in view of the relatively thin conduit for feeding the liquid or gaseous protective medium.
  • All the sealing means for this tuyere feed line for the protective medium are metallic wedge, cone and/or double wedge rings and the like.
  • Various regulatory means 22 are installed in the tuyere feed line.
  • regulating means may be installed and several may be arranged in parallel and/or in series. Installation is efiected using mechanical sealing rings and straight and angular connecting pieces. In the installation shown in FIG. 3, the line segment 14 between the supply line 21 and the protective medium feed-in, is approximately 10 mm. Tube 14 is of copper or steel.
  • the tuyere feed line for the refining gas could be connected to the supply line in the same manner as the protective medium line.
  • the connecting pipe between the refining gas feed-in and the supply line is preferably U-shape and is connected using metallic sealing rings and fittings or connectors.
  • Anglepiece 23 is brazed or welded to tuyere inner tube 2, located to provide the desired safetyspacing 20 between the protective medium feed-in and angle-piece 23.
  • This angle-piece 23 is provided with a maintenance-fitting 24 in an inner tube extension.
  • the maintenance-fitting 24 will be blank-flanged and opened only for maintenance, for instance for measuring tuyere length or if necessary, for padding the inner tube with, say, a ceramic substance if the tuyere-were to break down.
  • the angle piece 23 is connected by means of a threaded fitting 25 and a metallic ring seal 26 to another angle-piece 27.
  • Threaded fitting 25 is so designed that it allows a shift latitude'of about 25 mm in the tube seal.
  • a tube segment of any suitable length may be welded-in between threaded fitting 25 and the angle piece 27.
  • Angle-piece 27 is connected via 'a ball-andsocket joint 28 to the refining gas supply line 29. Balland-socket joint 28 permits rotation in any direction. Because of the feasibility of shifting provided in threaded fittings 15 and 25 and on account of ball-andsocket joint 28, any dimensional inaccuracies may be easily accommodated when fitting the supply lines to the tuyeres.
  • the OD of the tuyere feed line in the example shown may be 25 mm for the refining gas.
  • the feed line is made from ordinary steel tubing, though othermetal tubes may also be used, such as copper tubes or alloyed steel tubes.
  • the tuyere according to the invention and designed for the reliable introduction of refining gas together with a protective medium besides simple and reliable construction also is highly economical. It has been found in operation that elastic lines or springs or similar elastic connecting means are not required. The elimation of sensitive, elastic connecting pieces especially in the rough steel-making operations and elimination of the dangers of possible leaks in the feed lines represents an appreciable technical progress.
  • a tuyere as defined in claim 1 including in addition clamping nuts or screw caps (1, 15) mounted on the supply cap (l3) for tensioning the sealing rings (9,16), said sealing rings being detachable.
  • a tuyere as defined in claim 1 including, in addition a putty seal or mastic seal between the outer surface of the outer tuyere pipe (1) and steel mantle (5).
  • the metallic sealing rings (9, l6) and the putty or mastic (8) are each temperature resistant up to 300 C.
  • a tuyere as defined in claim 4 wherein the putty or mastic consists principally of SiO -Al O which is prepared from water glass and/or phosphoric acid solutions or with additions of cement and water.
  • a tuyere as defined in claim 1 including in addition ball joint connections (28) mounted in the supply lines (17, 27, 14) to the outer tuyere pipe (1) and to the supply cap (13).

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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)
US00313377A 1971-12-09 1972-12-08 Tuyere for introducing oxygen and a protective medium into converter vessels Expired - Lifetime US3811386A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2160999A DE2160999A1 (de) 1971-12-09 1971-12-09 Duese zum einleiten von sauerstoff mit einem schutzmedium in konvertergefaesse

Publications (1)

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US3811386A true US3811386A (en) 1974-05-21

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US00313377A Expired - Lifetime US3811386A (en) 1971-12-09 1972-12-08 Tuyere for introducing oxygen and a protective medium into converter vessels

Country Status (4)

Country Link
US (1) US3811386A (enrdf_load_stackoverflow)
JP (1) JPS4979905A (enrdf_load_stackoverflow)
DE (1) DE2160999A1 (enrdf_load_stackoverflow)
FR (1) FR2162614B1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023781A (en) * 1973-05-12 1977-05-17 Eisenwerk-Gesellschaft Maximilianshutte Mbh Tuyere for metallurgical vessels
US4097028A (en) * 1975-02-06 1978-06-27 Klockner-Werke Ag Method of melting and apparatus therefor
US4385753A (en) * 1980-03-05 1983-05-31 Creusot-Loire Tuyere for the simultaneous and separate introduction of at least one gas and one powder material
US5444733A (en) * 1993-05-17 1995-08-22 Danieli & C. Officine Meccaniche Spa Electric arc furnace with alternative sources of energy and operating method for such electric furnace
US20110290075A1 (en) * 2008-11-28 2011-12-01 Georg Aichinger Nozzle for Injecting Gas Containing Oxygen Into a Pig Iron Device Having an Injector Insertion Pipe
US20210285575A1 (en) * 2020-03-12 2021-09-16 Toshiba Energy Systems & Solutions Corporation Double pipe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA781814B (en) * 1977-03-31 1979-03-28 Union Carbide Corp Method for producing improved metal castings by pneumatically refining the melt
JPS5891111A (ja) * 1981-11-21 1983-05-31 Kawasaki Steel Corp 底吹き転炉用羽口
IT1280115B1 (it) * 1995-01-17 1998-01-05 Danieli Off Mecc Procedimento di fusione per forno elettrico ad arco con sorgenti alternative di energia e relativo forno elettrico ad arco

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410912A (en) * 1944-05-02 1946-11-12 Keystone Mfg Co Heat exchanger
US3076642A (en) * 1960-06-21 1963-02-05 Pompey Acieries Injection devices
US3703279A (en) * 1969-08-15 1972-11-21 Joslyn Mfg & Supply Co Reactor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410912A (en) * 1944-05-02 1946-11-12 Keystone Mfg Co Heat exchanger
US3076642A (en) * 1960-06-21 1963-02-05 Pompey Acieries Injection devices
US3703279A (en) * 1969-08-15 1972-11-21 Joslyn Mfg & Supply Co Reactor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023781A (en) * 1973-05-12 1977-05-17 Eisenwerk-Gesellschaft Maximilianshutte Mbh Tuyere for metallurgical vessels
US4097028A (en) * 1975-02-06 1978-06-27 Klockner-Werke Ag Method of melting and apparatus therefor
US4385753A (en) * 1980-03-05 1983-05-31 Creusot-Loire Tuyere for the simultaneous and separate introduction of at least one gas and one powder material
US5444733A (en) * 1993-05-17 1995-08-22 Danieli & C. Officine Meccaniche Spa Electric arc furnace with alternative sources of energy and operating method for such electric furnace
US20110290075A1 (en) * 2008-11-28 2011-12-01 Georg Aichinger Nozzle for Injecting Gas Containing Oxygen Into a Pig Iron Device Having an Injector Insertion Pipe
US8540931B2 (en) * 2008-11-28 2013-09-24 Siemens Vai Metals Technologies Gmbh Nozzle for injecting gas containing oxygen into a pig iron device having an injector insertion pipe
US20210285575A1 (en) * 2020-03-12 2021-09-16 Toshiba Energy Systems & Solutions Corporation Double pipe

Also Published As

Publication number Publication date
FR2162614A1 (enrdf_load_stackoverflow) 1973-07-20
JPS4979905A (enrdf_load_stackoverflow) 1974-08-01
DE2160999A1 (de) 1973-06-28
FR2162614B1 (enrdf_load_stackoverflow) 1976-06-04

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