EP0409980A1 - Tuyere pour le gunitage a la flamme d'une installation metallurgique - Google Patents

Tuyere pour le gunitage a la flamme d'une installation metallurgique Download PDF

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Publication number
EP0409980A1
EP0409980A1 EP87900347A EP87900347A EP0409980A1 EP 0409980 A1 EP0409980 A1 EP 0409980A1 EP 87900347 A EP87900347 A EP 87900347A EP 87900347 A EP87900347 A EP 87900347A EP 0409980 A1 EP0409980 A1 EP 0409980A1
Authority
EP
European Patent Office
Prior art keywords
oxygen
supply
lining
nozzles
blow mold
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Withdrawn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
EP87900347A
Other languages
German (de)
English (en)
Other versions
EP0409980A4 (fr
Inventor
Oleg Nikolaevich Chemeris
Izrail Abramovich Juzefovsky
Igor Pavlovich Tsibin
Alexandr Alexandrovich Shershnev
Tamara Petrovna Bugrim
Mikhail Vasilievich Malakhov
Rafik Sabirovich Aizatulov
Lev Mikhailovich Uchitel
Alexei Sergeevich Njunyaev
Mikhail Mikhailovich Klochnev
Jury Vasilievich Krjukov
Jury Arkadievich Marakulin
Igor Ivanovich Basalaev
Vasily Sergeevich Kharakhulakh
Anatoly Andreevich Chvilev
Pavel Alexandrovich Kaduba
Alexandr Stanislavovich Pliskanovsky
Valentin Dmitrievich Surzhenko
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.)
VSESOJUZNY GOSUDARSTVENNY INSTITUT NAUCHNO-ISSLEDOVATELSKIKH I PROEKTNYKH RABOT OGNEUPORNOI PROMUSHLENNOSTI
Original Assignee
VSESOJUZNY GOSUDARSTVENNY INSTITUT NAUCHNO-ISSLEDOVATELSKIKH I PROEKTNYKH RABOT OGNEUPORNOI PROMUSHLENNOSTI
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 VSESOJUZNY GOSUDARSTVENNY INSTITUT NAUCHNO-ISSLEDOVATELSKIKH I PROEKTNYKH RABOT OGNEUPORNOI PROMUSHLENNOSTI filed Critical VSESOJUZNY GOSUDARSTVENNY INSTITUT NAUCHNO-ISSLEDOVATELSKIKH I PROEKTNYKH RABOT OGNEUPORNOI PROMUSHLENNOSTI
Publication of EP0409980A4 publication Critical patent/EP0409980A4/fr
Publication of EP0409980A1 publication Critical patent/EP0409980A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • C21C5/44—Refractory linings
    • C21C5/441—Equipment used for making or repairing linings
    • C21C5/443—Hot fettling; Flame gunning
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
    • F27D1/1647—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus the projected materials being partly melted, e.g. by exothermic reactions of metals (Al, Si) with oxygen
    • F27D1/1652—Flame guniting; Use of a fuel
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
    • F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
    • F27D1/1647—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus the projected materials being partly melted, e.g. by exothermic reactions of metals (Al, Si) with oxygen
    • F27D1/1652—Flame guniting; Use of a fuel
    • F27D2001/1657—Solid fuel

Definitions

  • the present invention relates to repair agents used in the iron and steel industry, and in particular relates to a blow mold for flame retarding a metallurgical aggregate.
  • a blow mold for flame retardation (US Pat. No. 3883078 dated May 13, 1975) is generally known, which contains a coolable housing in which pipelines for the supply of a powdered refractory / fuel mixture and for the supply of oxygen into the metallurgical unit are housed, and has a nozzle for feeding them to the lining of the unit, which is attached to the end wall of the pipes and is directed at a straight angle relative to these.
  • Finely ground periklas powder is used as refractory and coke dust as fuel.
  • the periklas powder and the coke dust are mixed in a ratio of 3: 1. In the following, this mixture is referred to as gate scraps.
  • the particles of the garbage mass are entrained by the jet of oxygen, mixed with it and applied to the lining.
  • the fuel (coke particles) is heated, ignited and burned by the lining.
  • a high temperature zone arises near the lining and on its surface, and when the periklast particles in when they reach it, they are heated to the plastic state and when they come into contact with the surface of the lining, they weld to it, producing a coating which is firmly bonded to the refractory of the lining.
  • the periclast particles mainly in the peripheral region of the oxygen jet, which have not touched the surface of the lining in the impact zone of the oxygen jet loaded with the dust-like grease on the lining, are carried out into the gas cleaning system or into the atmosphere by the gases rising from the impact zone.
  • the effectiveness when applying the gate retardant is not high and is max. 50% (the weight ratio of the refractory powder welded on in the specified area and the refractory powder fed into the unit).
  • blow mold for flame flame retardation (SU copyright certificate No. 755851 from December 9, 1977, published in the bulletin "Discoveries, inventions, utility models, trademarks", No. 30, August 15, 1980), which contains a water-cooled housing in which coaxial arranged pipes for the supply of the garbage mass and the oxygen are accommodated in the unit space, and has at least one slot nozzle for the supply of the garbage mass to the area of the lining to be repaired, which is connected to the pipeline for the supply of the garbage mass and on the side wall is located near the face of the blow mold parallel to the axis of the piping and includes nozzles for supplying oxygen to the area of the lining to be repaired, which is connected to the pipeline for supplying oxygen and in the vicinity of the short sides of each slot nozzle for supplying the gate residue are arranged.
  • blow mold of this construction is an increased effectiveness in the application of the gate paste, which is achieved by pulling the gate paste apart over the surface of the lining along the longitudinal plane of symmetry of the slot nozzle.
  • the particles of the Torkret mass fly out of the nozzle are carried along by the oxygen jets and directed in the direction of the lining in the form of a plane-parallel stream of a mixture of coke and periklast particles and oxygen.
  • the coke particles are heated by the liner of the aggregate, ignite and burn to form a high-temperature zone in which the periclast particles are heated to the plastic state and weld onto the surface of the liner, thereby producing a coating.
  • the periklast particles which have not been welded to the lining, are carried out into the atmosphere by the gases rising from the gate locking area. Since the surface of the plane-parallel jet of the door-gate mass-oxygen mixture is large, the periclast particles are sucked in through the surface of the jet mentioned and directed back towards the lining. The more the plane-parallel jet is pulled apart, i.e. the larger the jet surface becomes, the greater the likelihood of the periclast particles welding onto the lining. With the help of the blow mold of this construction, the effectiveness in the application of the garbage paste is achieved up to 70%.
  • the slot length is limited by the conditions for the mixing of the garbage mass with the oxygen.
  • the coke particles burn in it Zone incomplete, which deteriorates the quality of the coating to be applied and reduces its durability.
  • the invention has for its object to provide a blow mold for flame retarding a metallurgical unit with such a structural design of its nozzles, through which the effectiveness in applying the doorstep mass and the durability of the coating are increased.
  • a blow mold for flame retarding metallurgical aggregates which contains a water-cooled housing in which coaxially arranged pipes for the supply of the gate secretion and the oxygen are accommodated in the unit space, and at least one slot nozzle for the supply of the gate secretion to the has to be repaired area of the liner, which is connected to the pipeline for the supply of the garbage paste and is arranged on the side wall of the blow mold near its end face parallel to the axis of the pipelines, and nozzles for supplying oxygen to the area of the liner to be repaired, the with the pipeline for the Oxygen supply are connected, in which, according to the invention, the nozzles for the oxygen supply are arranged uniformly along the long sides of each slot nozzle for the supply of the garbage paste.
  • the jet of the retorting mass-oxygen mixture is maximally decentralized over the surface of the lining without impairing the conditions for the mixing of the retorting mass with the oxygen in all areas of the lining.
  • This contributes to increasing the surface area of the scraper mass oxygen jet and the amount of periclast particles that weld to the surface of the liner.
  • this compensates and increases the temperature along the entire length of the application zone when the periklas powder particles are applied to the lining, as a result of which the particles sinter to a relatively higher density. In the end, all of this leads to a higher effectiveness when applying the garbage paste and to an increased durability of the coating.
  • the nozzles for the oxygen supply are expediently arranged in the blow mold for flame retardation at an angle of 20 to 40 ° to the longitudinal plane of symmetry of the slot nozzle for the supply of the gate retort material.
  • the garbage mass is poorly mixed with the oxygen and insufficiently collected by the oxygen jets, whereby a uniform distribution of the garbage mass over the lining is impaired and the temperature of the lining flame is reduced. As a result, the quality of the coating deteriorates and its durability is reduced.
  • nozzles for the oxygen supply are arranged at an angle greater than 40 ° to the longitudinal plane of symmetry of the nozzle for the supply of the garbage mass, a countercurrent of oxygen is produced which creates an additional resistance for the garbage mass. This creates conditions for your line to become blocked.
  • the oxygen can penetrate into the pipeline for the garbage mass and ignite the carbon of the garbage mass, which is not permitted from a safety point of view.
  • the nozzles for oxygen supply arranged on each long side of the slot nozzle are preferably arranged in a fan shape with an opening angle of 15 to 45 ° in the blow mold for flame retardation.
  • the mass of the slot nozzle and above all the length of its long sides are due to the conditions for a uniform outflow of the gate residue Slot cross-section limited.
  • the consumption of the Torkretmasse on the front side of the blow mold is significantly higher than at the nozzle top.
  • the slit nozzle can be blocked by the garbage paste, whereby the aggregate lining is attacked by the oxygen jets and its durability is reduced.
  • Slit nozzles are used for flame arresting, the length of which is several times smaller than the required length of the flame pulling apart.
  • the fan-shaped pulling apart of the oxygen jets assumes that the size of the flame decentralization over the lining compared to the slit length is significantly increased, provided that the plane-parallel jet of the door body mass is completely collected. This increases the surface area of the two-phase jets, the narrow particles of the refractory powder captured by this surface area and accordingly the effectiveness in the application of the garbage paste.
  • the opening angle of the fan is less than 15 °, the flame decentralization via the lining is not large enough to significantly increase the effectiveness when applying the door crumb compound.
  • the fan opening angle is greater than 45 °, the longitudinal component of the flame speed, which is directed along the flame decentralization via the lining, increases.
  • the discharge loss of the particles of the refractory powder increases so much in this direction that the effectiveness in applying the garbage paste is no longer increased by a further enlargement of the opening angle of the fan.
  • the blow mold for flame retarding (Fig. 1, 2, 3, 4) contains a coolable housing, which is formed by pipes 1 and 2 and in the pipe lines 3 and 4 are arranged coaxially for the supply of oxygen and the door mass.
  • the garbage mass is a powdery mixture of a refractory and a carbon-containing fuel in a ratio of 3: 1.
  • An annular channel between the pipes 1 and 2 is used for the cooling water supply.
  • An annular channel between pipes 2 and 3 is used for water drainage.
  • An annular channel between the pipes 3 (Fig. 2) and 4 is used for the oxygen supply.
  • the central pipeline 4 serves for the supply of the garbage mass in the form of a suspension in a carrier gas (possibly in the air) with a weight concentration (weight ratio of the garbage mass and the air to one another) of 100 to 200 kg / kg.
  • the blow mold has a slit nozzle 5 for the supply of the gate residue.
  • the blow mold has only one slot nozzle, but the number of such nozzles 5 can be larger. The number of nozzles depends on the size of the area of the lining to be repaired.
  • the slot nozzle 5 is arranged in such a way that its longitudinal plane of symmetry runs along the blow mold axis (the longitudinal plane of symmetry of the slot nozzle 5 may lie on the blow mold axis).
  • Ten round nozzles 6 for the oxygen supply are arranged uniformly along the long sides of the slot nozzle 5.
  • the number and configuration of the oxygen supply nozzles 6 may be different.
  • FIG. 5 shows a blow mold for flame retardation, which is located in the space of a metallurgical unit (optionally in an oxygen converter 7).
  • This blow mold has two slit nozzles 5.
  • the nozzles 5 and 6 for the supply of the garbage paste and the oxygen are directed towards the area of the lining to be repaired, where a refractory coating 8 is formed.
  • the gases rising from the point to be repaired are removed from the space of the converter 7 via a neck 9 and fed to the existing gas cleaning system (not shown in the drawing).
  • the blow mold for flame retarding a metallurgical aggregate is operated as follows.
  • the water supply for cooling the blow mold is switched on and the blow mold for flame flame locking is introduced into the space of the converter 7.
  • the blow mold is arranged such that the nozzles 5 and 6 are directed toward the surface area of the lining of the converter 7 to be repaired. Via the central pipeline 4 and via the slot nozzles 5 the goalie mass supplied. Then oxygen is supplied via the ring channel between the pipelines 3 and 4 and via the nozzles 6, the consumption of which is adjusted on the basis of the condition of complete combustion of the fuel which is introduced into the garbage paste via the nozzles 5.
  • the refractory is applied to the areas of the lining of the converter 7 to be repaired.
  • the blow mold can be moved along the longitudinal axis of the converter or rotated about its axis in any known manner.
  • the gate secretion flows out of the slot nozzles 5 in the form of plane-parallel jets.
  • the oxygen flows out of the round nozzles 6 in the form of concentric jets which are drawn apart in a fan-shaped manner along the long sides of the slit nozzle 5 and are directed onto the plane-parallel jets of the gate secretion from the two sides in such a way that each elementary volume of the stream of the gate secretion exits from the nozzle 5 captured by the oxygen jets and transported to the surface of the liner in the directions determined by the oxygen jets.
  • the refractory powder and the fuel mix with the oxygen in the immediate vicinity of the blow molding nozzles 5 and 6, and they form a fan-shaped, diverging dust-gas flow towards the surface of the lining.
  • the fuel particles ignite from the lining and burn.
  • a flame forms in the vicinity of the lining, in which the refractory particles heat up to the plastic state and weld onto the lining to form a fire-resistant coating.
  • the larger the opening angle of the fan-shaped jet the greater the decentralization of the flame over the lining and its surface, the more particles of the refractory powder are collected by this surface from the atmosphere of the aggregate, the more particles settle on the lining and weld onto it and, accordingly, the higher the effectiveness in applying the garbage paste.
  • the blow mold according to the invention can be used for repairing the lining of metallurgical units of cylindrical shape, for example of converters and steel ladles.
  • it can be used to lock flat surfaces of the lining of metallurgical aggregates, for example the side walls of steel melting, heating and other furnaces.
  • the invention can be used particularly effectively in the repair of the lining of metallurgical units when hot.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Abstract

Une tuyère pour le gunitage à la flamme d'une installation métallurgique pourvue d'un revêtement en matériau réfractaire comporte un boîtier refroidi contenant des tuyauteries (3, 4) d'alimentation d'oxygène et du produit de gunitage destiné à l'espace intérieur de l'installation. La tuyère comporte également au moins une buse (5) à fente destinée à envoyer le produit de gunitage à la zone du revêtement à réparer, reliée à la tuyauterie (4) d'alimentation du produit de gunitage et située sur la paroi de la tuyère, près de son extrémité, parallèle aux axes des tuyauteries (1, 2, 3, 4). La tuyère est également pourvue de buses (6) servant à envoyer l'oxygène à la zone du revêtement à réparer, lesdites buses étant reliées à la tuyauterie (3) d'alimentation en oxygène et régulièrement espacées le long des côtés plus longs de chaque buse à fente (5) d'alimentation en produit de gunitage.
EP87900347A 1986-10-17 1986-10-17 Tuyere pour le gunitage a la flamme d'une installation metallurgique Withdrawn EP0409980A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1986/000098 WO1988002786A1 (fr) 1986-10-17 1986-10-17 Tuyere pour le gunitage a la flamme d'une installation metallurgique

Publications (2)

Publication Number Publication Date
EP0409980A4 EP0409980A4 (fr) 1989-02-22
EP0409980A1 true EP0409980A1 (fr) 1991-01-30

Family

ID=21617041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87900347A Withdrawn EP0409980A1 (fr) 1986-10-17 1986-10-17 Tuyere pour le gunitage a la flamme d'une installation metallurgique

Country Status (4)

Country Link
EP (1) EP0409980A1 (fr)
JP (1) JPH01501412A (fr)
BR (1) BR8607223A (fr)
WO (1) WO1988002786A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237623B (en) * 1989-10-05 1994-04-27 Glaverbel Ceramic welding process and lance for use in such process

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE856712C (de) * 1951-04-29 1952-11-24 Kuehnle Ag Verfahren zum UEberziehen von anschmelzbaren, insbesondere metallischen Oberflaechenmit verschleiss- und korrosionsfesten Schutzwerkstoff-Schichten
FR1420218A (fr) * 1964-01-17 1965-12-03 Mannesmann Ag Pistolet pulvérisateur
FR2457720A1 (fr) * 1979-05-30 1980-12-26 Do Nii Chernoj Metallurgii Lance pour la projection au jet de flamme de matieres de revetement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883078A (en) * 1972-01-28 1975-05-13 Oleg Nikolaevich Chemeris Method and a device for gunniting converter linings
SU755851A1 (ru) * 1977-12-09 1980-08-15 Novolipetskij Metall Zavod Фурма для факельного торкретирования 1
GB2060437B (en) * 1979-09-21 1983-04-20 Do Nii Chernoj Metallurgii Method of and apparatus for depositing refractory material on a lining of an upright converter
SU973626A1 (ru) * 1980-11-17 1982-11-15 Карагандинский металлургический комбинат Способ факельного торкретировани сводов пламенных отражательных металлургических печей

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE856712C (de) * 1951-04-29 1952-11-24 Kuehnle Ag Verfahren zum UEberziehen von anschmelzbaren, insbesondere metallischen Oberflaechenmit verschleiss- und korrosionsfesten Schutzwerkstoff-Schichten
FR1420218A (fr) * 1964-01-17 1965-12-03 Mannesmann Ag Pistolet pulvérisateur
FR2457720A1 (fr) * 1979-05-30 1980-12-26 Do Nii Chernoj Metallurgii Lance pour la projection au jet de flamme de matieres de revetement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8802786A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2237623B (en) * 1989-10-05 1994-04-27 Glaverbel Ceramic welding process and lance for use in such process

Also Published As

Publication number Publication date
WO1988002786A1 (fr) 1988-04-21
BR8607223A (pt) 1988-12-06
JPH01501412A (ja) 1989-05-18
EP0409980A4 (fr) 1989-02-22

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