EP0339174A1 - Ein- oder Aufblaslanze mit Kühlkammer - Google Patents

Ein- oder Aufblaslanze mit Kühlkammer Download PDF

Info

Publication number
EP0339174A1
EP0339174A1 EP88870073A EP88870073A EP0339174A1 EP 0339174 A1 EP0339174 A1 EP 0339174A1 EP 88870073 A EP88870073 A EP 88870073A EP 88870073 A EP88870073 A EP 88870073A EP 0339174 A1 EP0339174 A1 EP 0339174A1
Authority
EP
European Patent Office
Prior art keywords
tube
lance
nose
injection
tubes
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Withdrawn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
EP88870073A
Other languages
English (en)
French (fr)
Inventor
René Desaar
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.)
Recherches Et Developpements Desaar SA
Original Assignee
Recherches Et Developpements Desaar 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 Recherches Et Developpements Desaar SA filed Critical Recherches Et Developpements Desaar SA
Priority to EP88870073A priority Critical patent/EP0339174A1/de
Priority to BR8901996A priority patent/BR8901996A/pt
Priority to CN 89102848 priority patent/CN1037361A/zh
Publication of EP0339174A1 publication Critical patent/EP0339174A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • 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
    • C21C5/4606—Lances or injectors
    • C21C5/4613—Refractory coated lances; Immersion lances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising

Definitions

  • the present invention relates to a lance for injecting a product or blowing a gas into a liquid metal in steelworks and foundries.
  • An injection or blowing lance essentially consists of a metal injection tube reinforced with an intermediate tube surrounded by a protective sheath made of refractory material over at least part of its length.
  • a protective sheath made of refractory material over at least part of its length.
  • the lances are subjected to significant thermal shocks which produce expansions of the metallic parts embedded in the refractory sheath.
  • thermal shocks it is known (patents BE 837384, BE 849582, DE 2659735 and US 4097030, in particular) to provide the lance with a cooling device intended to circulate a cooling agent in a chamber ring formed between the injection tube and the intermediate tube.
  • the object of the invention is to provide a lance with a cooling chamber arranged so as to promote differential thermal expansion between the metal parts and the refractory sheath.
  • an injection or blowing lance comprising an intermediate tube coaxial with the injection tube and a protective sheath made of refractory material extending over at least part of the length of the lance, the injection tube and the intermediate tube delimiting between them a chamber, this lance being characterized by at least one coolant supply tube extending along and outside the intermediate tube, this supply tube being connected at its upper end to a coolant supply device and communicating at its lower end with the lower part of the cham bre so as to circulate a flow of cooling fluid from top to bottom outside the intermediate tube and from bottom to top in said cooling chamber.
  • the refractory sheath is separated from the metal parts of the lance by an element made of non-expandable material, for example a cardboard tube, preventing the attachment of the refractory material on the metal tubes and allowing a free expansion of these metal tubes under the effect. the high temperature of a bath of molten metal when the lance is immersed in it, without causing cracks in the refractory sheath.
  • the refractory sheath may comprise, embedded in its mass, a metal reinforcing reinforcement which extends practically coaxially around the lance body.
  • the reinforcing reinforcement preferably consists of a mesh structure, the dimensions of the meshes being such that the refractory material coating the reinforcement extends continuously through the meshes so that the refractory essentially forms a monolithic mass. .
  • the end of the lance is advantageously protected by a protective nose made of refractory material, optionally removably attached.
  • a protective nose made of refractory material, optionally removably attached.
  • protective noses are known, for example from BE 904670, EP 0099348 and EP 0116818.
  • the nose comprises a connecting tube which extends in alignment with the tube. injection, the inside diameter of said tube being smaller than the inside diameter of the injection tube tion.
  • connection tube carries several tubes communicating with the conduit of said connection tube, these tubes being distributed around the connection tube and extending in general directions transverse to the axis of the tube, these tubes opening to the outer surface of the nose in order to eject lateral fluid jets so as to balance the reaction exerted on the lance by the ejected fluid.
  • the connecting tube can advantageously be surrounded by a cooling chamber.
  • a metal injection tube suspended by its upper end from a lifting ring 11 to which it is fixed by a nut 12.
  • the tube 1 is used for the passage of a product (material or gas) to be injected or injected into a liquid metal.
  • a product material or gas
  • the injection tube 1 is surrounded by a sliding metal tube 2, the lower end of which is housed in a groove formed in a washer 3 which serves as a support and is welded to the tube.
  • the tube 2 here has a cylindrical shape as shown in FIGS. 2 and 3, but it can also have a prismatic shape as will be described below with the aid of FIG. 4.
  • the space between the tubes 1 and 2 forms a cooling chamber 20 ( Figures 2 and 3).
  • the tube 2 is pierced with at least one opening to which is connected a radial connector 21 which communicates with the conduit of a tube 22 descending along and outside the tube 2.
  • a radial connector 21 which communicates with the conduit of a tube 22 descending along and outside the tube 2.
  • four tubes 22 thus descend along the tube 2 and communicate with the chamber 20.
  • these tubes 22 open in a box 23 into which, on the other hand, leads a pipe 24 for the supply of a cooling agent.
  • the flow of cooling fluid which circulates in the tubes 22 is a flow of cold fluid which leaves the distributor box 23 and first descends practically along the interior surface of the refractory sheath 4, producing a most efficient cooling.
  • the cooling fluid rose along the intermediate tube, it had already been able to heat up somewhat and its effect was therefore less energetic than in the lance according to the present invention.
  • this means consists of a steel wire 25 wound helically around the injection tube over part of the length thereof. This wire has the effect of guiding the cooling fluid in the chamber 20 in a rotating movement which develops from bottom to top, thus slowing the circulation of the flow in the cooling chamber and improving the cooling effect.
  • FIG. 4 illustrates for example another embodiment.
  • the cooling chamber 20 is here limited externally by a tube 2 of square polygonal cross section.
  • the section polygonal cross-section can have any number of sides.
  • the means for slowing down the cooling flow in this example, consists of baffle elements 26 arranged in planes transverse to the longitudinal axis of the injection tube 1 and distributed regularly along the injection tube. In the illustrated embodiment, the elements 26 extend over one half of the cross section of the cooling chamber 20, the successive elements occupying alternating positions so as to provide for the cooling fluid a sinuous passage in the axial direction. of the injection tube.
  • baffle elements could also, for example, all extend over the entire cross section of the cooling chamber and be pierced with orifices which, preferably, are not all in the same alignment in the axial direction. These baffle elements form narrowing of the passage section which forces the cooling fluid to slow down in the cooling chamber.
  • the cooling device also has the advantage that when the lance is used for injecting certain pulverulent products into a bath of liquid metal, it prevents these products from reaching a temperature such that they would turn into a pasty material which would cause generally a blockage of the lance ducts.
  • the metal tubes of the lance are protected by a sheath 4 made of refractory material with the interposition of an element 5 made of non-expandable material under the effect of heat.
  • the sheath 4 is maintained by the pressure of a helical spring 13 acting through the inter median of a spacer 14.
  • the refractory sheath is shown in FIG. 1 in monolithic form, but it could also, in accordance with a known technique, be formed of refractory rings superimposed and joined together by seals. In such an embodiment, the joints obviously constitute weak points where deterioration also occurs.
  • the intermediate element 5 is for example made of a cardboard tube but other non-expandable materials can be used.
  • this non-expandable element has the effect of dissociating the refractory sheath from the metallic element of the lance and shielding it from the influence of expansions of the metallic body while allowing it to expand freely under the effect of the high temperature communicated by the molten metal bath when the lance is immersed in it. Thanks to this separation resulting from the presence of the non-expandable intermediate element, the refractory sheath degrades much less deeply and much less quickly than in a lance according to the prior art. This results in a significant reduction in repairs and replacements, which translates into considerable savings in manpower, immobilization time of the lance and consumption of lances.
  • a reinforcing reinforcement 15 can advantageously be embedded in the refractory mass.
  • the patents BE-837384, BE-849582 and DE-2659735 describe a reinforcing reinforcement consisting of a mesh structure produced from galvanized steel wire. The dimensions of the mesh of the frame 15 are such that the refractory material which coats the reinforcement extends continuously through the meshes and on either side of the reinforcement 15.
  • the refractory sheath 4 also forms a protective nose 6 to ensure balancing of the reaction exerted on the lance by the fluid during its ejection.
  • the injection tube 1 is extended by a metal connection tube 7 welded at its end.
  • the lower end 8 of the tube 7 is closed and the tube 7 carries several tubes 9 which communicate with the conduit of the tube 7 and are arranged so as to open into the external lateral wall of the nose.
  • the connection tube 7 carries for example four pipes 9, but their number can be any. These pipes are used to produce several lateral jets of fluid with the most balanced distribution possible around the longitudinal axis of the tube 7, that is to say the longitudinal axis of the lance.
  • This lateral and balanced arrangement of the outlet pipes is known from patents BE 871590 and BE 904670 for example.
  • the connecting tube 7 has a smaller diameter than that of the injection tube 1 so as to create a higher pressure zone which can act as a buffer and makes it possible to avoid the obstruction of the pipes 9 by re-entry of liquid metal when the fluid pressure drops in the injection tube.
  • Such tubing obstructions were not uncommon in the anterior lance noses, which hampered the smooth running of the technical process. This drawback is eliminated thanks to the present invention.
  • the tubes 9 are straight and oblique with respect to the axis of the lance. It is understood, however, that variant embodiments can be used as described in particular in the aforementioned patents BE 871590 and BE 904670. In particular, the tubes can be curved or be arranged to produce horizontal jets.
  • a reinforcing reinforcement 16 as described for example in patents EP 0099348 and US 4492365.
  • This reinforcing reinforcement can be constituted in a similar manner to the reinforcement 15 of the lance sheath 2 and it can extend this frame by extending coaxially around the connecting tube 7, then extending in a plane transverse to the axis of said tube at a certain distance from the end of this tube.
  • the branches identified by the reference notation 17 are anchoring elements welded to the connecting tube.
  • the protective nose like the body of the lance, can comprise a cooling means: for example a chamber surrounding the connection tube 7.
  • the end of the lance can be protected by a nose screwed onto the injection tube so that it can be replaced without having to replace the entire lance.
  • Various types of removable lance noses are known.
  • the lance nose illustrated by way of example in FIG. 5 is similar to that which is shown in FIG. 1.
  • the upper end of the connection tube 7 comes out of the refractory block of the nose and has a thread 18 intended to cooperate with a similar thread arranged in the interior wall of the injection tube 1.
  • This embodiment combines the advantages of the nose shown in FIG. 1 with those of the removable lance nose.
  • a cooling means can also be provided in the removable protective nose.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Nozzles (AREA)
EP88870073A 1988-04-28 1988-04-28 Ein- oder Aufblaslanze mit Kühlkammer Withdrawn EP0339174A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP88870073A EP0339174A1 (de) 1988-04-28 1988-04-28 Ein- oder Aufblaslanze mit Kühlkammer
BR8901996A BR8901996A (pt) 1988-04-28 1989-04-27 Lanca de injecao ou de insuflacao e ponta de protecao em material refratario
CN 89102848 CN1037361A (zh) 1988-04-28 1989-04-27 内含冷却腔的喷射或喷气喷枪

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88870073A EP0339174A1 (de) 1988-04-28 1988-04-28 Ein- oder Aufblaslanze mit Kühlkammer

Publications (1)

Publication Number Publication Date
EP0339174A1 true EP0339174A1 (de) 1989-11-02

Family

ID=8200686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88870073A Withdrawn EP0339174A1 (de) 1988-04-28 1988-04-28 Ein- oder Aufblaslanze mit Kühlkammer

Country Status (3)

Country Link
EP (1) EP0339174A1 (de)
CN (1) CN1037361A (de)
BR (1) BR8901996A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0919634A1 (de) * 1997-12-01 1999-06-02 Plibrico G.m.b.H. Blaslanze mit gasgekühlter Feuerfestummantelung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113048486A (zh) * 2021-03-23 2021-06-29 中国恩菲工程技术有限公司 工业废弃物综合处理炉

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1125234A (fr) * 1954-05-28 1956-10-26 Huettenwerk Oberhausen Ag Tuyère de soufflage pour l'affinage de métaux
LU76524A1 (de) * 1976-01-07 1977-06-20 Rene Desaar
LU76254A1 (de) * 1976-11-24 1978-07-10
BE902065A (fr) * 1985-03-29 1985-07-16 Vasipari Kutato Fejleszto Lance de soufflage pour le traitement de bains metalliques dans des installations metallurgiques.
DE3423192A1 (de) * 1984-06-22 1986-01-02 Krupp Polysius Ag, 4720 Beckum Tauchlanze

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1125234A (fr) * 1954-05-28 1956-10-26 Huettenwerk Oberhausen Ag Tuyère de soufflage pour l'affinage de métaux
LU76524A1 (de) * 1976-01-07 1977-06-20 Rene Desaar
LU76254A1 (de) * 1976-11-24 1978-07-10
DE3423192A1 (de) * 1984-06-22 1986-01-02 Krupp Polysius Ag, 4720 Beckum Tauchlanze
BE902065A (fr) * 1985-03-29 1985-07-16 Vasipari Kutato Fejleszto Lance de soufflage pour le traitement de bains metalliques dans des installations metallurgiques.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0919634A1 (de) * 1997-12-01 1999-06-02 Plibrico G.m.b.H. Blaslanze mit gasgekühlter Feuerfestummantelung

Also Published As

Publication number Publication date
CN1037361A (zh) 1989-11-22
BR8901996A (pt) 1989-12-05

Similar Documents

Publication Publication Date Title
CA1105255A (fr) Lance de desulfuration de fonte ou d'acier
EP0627492B1 (de) Schmelzofen mit Gaseinjektor
BE1009743A3 (fr) Tuyere de soufflage a oxygene siderurgique.
EP0339174A1 (de) Ein- oder Aufblaslanze mit Kühlkammer
EP1006533B1 (de) Druckbehälter für einen Druckwasserreaktor mit zugehöriger Vorrichtung zur Beruhigung der Kühlwasserströmung im Behälterboden
FR2502177A1 (fr) Dispositif d'introduction de gaz dans des vases metallurgiques
FR2579621A1 (fr) Lance de soufflage pour le traitement de bains metalliques dans des installations metallurgiques
EP0336050A1 (de) Injektions- oder Blas-Lanze
CA1258170A (fr) Poches de coulee pour metal en fusion
EP0327526B1 (de) Vorrichtung zum Kühlen eines Metalls während des Giessens
CA1086806A (fr) Poche metallurgique pour les traitements inductifs des metaux
FR2549083A1 (fr) Lance pour insuffler des substances fluidisees dans un bain de fusion de metal
FR2642679A3 (fr) Dispositif d'elimination des inclusions non metalliques dans un repartiteur de coulee continue de l'acier
CA2204137C (fr) Une poche de chauffage et de coulee de metaux liquides
BE904670R (fr) Nez de lance de desulfuration de fonte ou d'acier.
FR2659880A1 (fr) Dispositif de liaison entre un recipient metallurgique contenant un metal liquide et une lingotiere.
CA1206752A (fr) Procede et dispositif pour vidanger des recipients metallurgiques
BE893384A (fr) Tuyere de soufflage de gaz, sa fabrication et son utilisation
FR2722796A1 (fr) Piece protectrice modulaire en ceramique et grille de soufflage de regenerateur d'unite de craquage catalytique munie d'un revetement protecteur forme de telle pieces
EP3638412B1 (de) Gasinjektionselement für eine fluid-catalytic-cracking-einheit und mit diesem gasinjektionselement ausgestattetes gasverteilungssystem
BE902065A (fr) Lance de soufflage pour le traitement de bains metalliques dans des installations metallurgiques.
BE837384A (fr) Lance de desulfuration de fonte en poche
WO1992000390A1 (fr) Cuve de convertisseur pour l'elaboration de metal liquide
FR2608475A1 (fr) Obturateur tournant pour un recipient metallurgique ainsi que corps rotatif pour un tel obturateur
EP0387229A1 (de) Prallplatte für eine Giesspfanne

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

RBV Designated contracting states (corrected)

Designated state(s): AT BE DE ES FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19900404

17Q First examination report despatched

Effective date: 19920508

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19930308