EP0277232B1 - Düse zum heissreperaturspritzen bei metallurgischen anlagen - Google Patents

Düse zum heissreperaturspritzen bei metallurgischen anlagen Download PDF

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Publication number
EP0277232B1
EP0277232B1 EP86905482A EP86905482A EP0277232B1 EP 0277232 B1 EP0277232 B1 EP 0277232B1 EP 86905482 A EP86905482 A EP 86905482A EP 86905482 A EP86905482 A EP 86905482A EP 0277232 B1 EP0277232 B1 EP 0277232B1
Authority
EP
European Patent Office
Prior art keywords
powder
oxygen
gate
channel
nozzle
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.)
Expired - Lifetime
Application number
EP86905482A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0277232A4 (de
EP0277232A1 (de
Inventor
Alexandr Andreevich Kugushin
Mikhail Vasilievich Malakhov
Anatoly Vasilievich Lakuntsov
Lev Mikhailovich Uchitel
Rafik Sabirovich Aizatulov
Jury Arkadievich Marakulin
Igor Pavlovich Tsibin
Alexandr Alexandrovich Shershnev
Vyacheslav Fedorovich Badakh
Izrail Abramovich Juzefovsky
Nina Pavlovna Chernova
Viktor Albertovich Breido
Vitaly Semenovich Novikov
Ivan Vasilievich Drozdov
Georgy Alexeevich Maximov
Gennady Petrovich Matveev
Vladimir Fedorovich Korzun
Boris Innokentievich Ashpin
Jury Viktorovich Lipukhin
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 EP0277232A1 publication Critical patent/EP0277232A1/de
Publication of EP0277232A4 publication Critical patent/EP0277232A4/de
Application granted granted Critical
Publication of EP0277232B1 publication Critical patent/EP0277232B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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; 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; 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 means for repairing the lining of metallurgical units and relates in particular to blow molds for flame retarding a metallurgical unit, wherein Torkret is understood to mean a refractory / fuel mixture.
  • the present invention can be used in the repair of the lining of metallurgical aggregates in iron and non-ferrous metallurgy and coke ovens.
  • the present invention can be used particularly effectively for the repair of the lining of steel melting units in which the temperature exceeds 1400 ° C.
  • blow molds for flame retarding a metallurgical unit which contain a water-cooled housing, in the coaxial with a pipe for Torkretpulverzuschreib and an annular pipe for oxygen supply are accommodated in the space of the metallurgical unit, at the ends of which at least one Torkretdüse is attached, which has a channel for the supply of Torkretpulver and a channel for the supply of oxygen, the channel for the supply of oxygen in the axis of the gate gate nozzle and the gate for gate gate powder supply are arranged on the circumference of the channel for the oxygen supply.
  • blow molds have a complicated design, are therefore complex to manufacture and their nozzles are subject to severe abrasive wear, which can cause them to fail quickly.
  • a blow mold for flame retarding a metallurgical aggregate (“Flame ment retarding the lining of oxygen converters", Kiev, Kunststoffa, 1984, 143 p., Fig. 22, p. 58) is also known, which has a water-cooled housing with pipelines accommodated therein for the supply contains a powdered powder and oxygen in the space of the metallurgical aggregate.
  • cylindrical tube-in-tube type gate nozzles with an (inner) channel for the powder gate supply and an (outer) channel for the oxygen supply are attached.
  • the gate flame can be pulled apart along the length of the blow mold, which increases the effectiveness of the flame retracting process.
  • a blow mold for flame retarding a metallurgical unit (“Flame ment retarding the lining of oxygen converters", Kiev, Kunststoffa, 1984, 143 p., Fig. 23a, p. 61) is also known, which has a water-cooled housing with pipelines housed therein for the supply of a Contains powdered gate powder and oxygen in the space of the metallurgical aggregate. At the end of the ßlasform there are gate nozzles with a channel for the powder powder supply and a concentric channel for the oxygen supply. In this case, the channel for the supply of powdered powder runs along the axis of the gate gland and the channel for the supply of oxygen is elliptical in cross section.
  • This construction of the gate jets increases the mixing of the gate powder with oxygen to some extent.
  • the elliptical nozzles are complicated to manufacture.
  • blow mold for flame retarding metallurgical aggregates (Flame ment retarding the lining of oxygen converters", Kiev, Kunststoffa, 1984, 143 pp., Fig. 23 w, pp. 61), which has a water-cooled housing with piping housed therein for the supply contains a powdered powder and oxygen in the space of the metallurgical aggregate.
  • gate jets which have a channel for the gate powder supply lying along the axis of the gate nozzle and a channel for the oxygen supply which is concentric with it.
  • the channel for the oxygen The feed is provided with slots through which approx. 20% oxygen is introduced into the channel for the powdered powder.
  • a blow mold for flame retarding a metallurgical aggregate (“Flame ment retarding the lining of the oxygen converters”. Kiev, Kunststoffa, 1984, 143 p., Fig. 23b, p. 61) is known, which has a water-cooled housing with pipelines accommodated therein for the supply of a Contains powdered gate powder and oxygen in the space of the metallurgical aggregate.
  • gates At the end of the blow mold there are gates that have a channel for the supply of powder and a concentric channel for the supply of oxygen, the channel for the supply of powder running along the axis of the gate.
  • the two channels are provided with alternately arranged grooves of wedge-shaped cross section, which widen in the direction of the outlet cross section.
  • the gate nozzles are complicated to manufacture and the distribution of the gate powder over the cross section of the gate flame has a clearly pronounced maximum that runs in the ashes of this flame. Due to the uneven distribution of the garbage powder over the cross-section of the garbage flame, the combustion of fuel in this flame is deteriorated, as a result of which the durability of the garbage coatings is reduced and the consumption of grease powder increases.
  • the invention has for its object a blow Form for flame retarding a metallurgical aggregate to improve such that the durability of the Torkretüberzug to be applied and the consumption of Torkretpulver is reduced, the blow mold is easier to manufacture and has a longer service life with respect to the nozzles.
  • a blow mold for flame retarding a metallurgical unit which contains a water-cooled housing in which coaxially a pipe for the supply of powdered powder and an annular pipe for the supply of oxygen are accommodated in the space of the metallurgical unit, at the ends of which at least one powder jet nozzle is attached, which has a channel for powdered powder and a channel for supplying oxygen, the channel for supplying oxygen being arranged in the axis of the powdered gate nozzle and the channel for powdered powder supply being arranged on the circumference of the channel for supplying oxygen, in that the duct for powdered powder supply is arranged in the powder dispenser nozzle consists of 3 to 8 holes arranged symmetrically to the gate nozzle and its longitudinal axis.
  • the uniform supply of the powdered powder on the circular line in the flame cross-section is significantly impaired.
  • the fuel concentration is higher than the stoichiometric value and at the other a lower one. In both cases, the fuel combustion is deteriorated and the durability of the door chalk covering to be discharged is reduced.
  • the wicket nozzle has an additional channel for the supply of oxygen which is concentric on the circumference of the channel for the supply of powdered powder.
  • the retracting nozzle has an additional channel for the supply of oxygen, which consists of holes between the holes for the supply of retractable powder.
  • the channel for the oxygen supply which runs in the axis of the gate chill nozzle has a cross-sectional area which is 0.5 to 3.0 times the total cross-sectional area of the additional channel for the oxygen supply.
  • the concentration of the chalk powder in the axis of the gate chimney flame is substantially greater than the concentration of the garbage powder at the periphery of this flame, thereby worsening the fuel burn and, as a result, reducing the durability of the garbage coating.
  • the distribution of the powdered gate powder decreases to a minimum value in the axis of the flame-retardant flame, which also deteriorates and burns the fuel the durability of the goalie cover is reduced.
  • the gate retarding nozzle has an additional channel for the supply of oxygen, which consists of two slit-shaped openings, the shape of which can be used to generate supersonic jets and which are at an angle of 7 to 12 ° symmetrical to the axis of the gate retarding nozzle in one are perpendicular to the plane of the blow mold, the critical total cross-sectional area of the slot-shaped openings being 0.2 to 1.0 times the cross-sectional area of the main channel for supplying oxygen.
  • Such a construction forms a stable gate flame with a certain opening angle.
  • the supersonic jets of the additional oxygen mix with the Torkret powder on the initial cross-section of the Torkret flame, thereby increasing the ejection of the surrounding medium and dissolving the flame through the lining.
  • the supersonic jets are not in contact with the gate scraper powder jet. This reduces their range and increases the ejection of the surrounding medium.
  • the flame retardant flame dissolves more, its thermal tension decreases, which reduces the durability of the flame retardant coating.
  • the cross-sectional area of the slit-shaped openings is less than 0.2 times the cross-sectional area of the main channel for supplying oxygen, the kinetic energy of the supersonic jets is not sufficient to form the gate flame on a large section.
  • the lorkret flame is strongly dissolved near the lining, which leads to a higher consumption of torkret powder.
  • the cross-sectional area of the slit-shaped openings is more than 1.0 times the cross-sectional area of the main channel for supplying oxygen, the excess oxygen factor increases significantly, which cools the flame and reduces the durability of the door chalk coating.
  • the construction of the blow mold according to the invention for flame retarding a metallurgical unit allows the durability of the door chime coating to be applied to be improved and the consumption of door chalk powder to be reduced.
  • the blow mold for flame retardation contains a water-cooled housing 1 (FIG. 1), in which a pipe 2 for the supply of powdered powder and a pipe 3 for the supply of oxygen are accommodated in the room of a metallurgical unit. At the end of the pipelines 2 and 3 there is a gate nozzle 4 which is provided with a channel 5 for supplying gate powder and a channel 6 for supplying oxygen.
  • only one nozzle 4 is attached to the end of the pipes 2 and 3.
  • the number of similar nozzles 4 can be larger.
  • the number of nozzles 4 is selected depending on the size of the area of the lining of a metallurgical unit to be locked.
  • the channel 6 for the supply of oxygen runs in the axis of the gate nozzle 4 and the channel 5 for the supply of gate powder lies on the circumference of the channel 6 for the supply of oxygen.
  • Such an arrangement of the channel 6 for the supply of oxygen and the channel 5 for the supply of powdered door powder results in a uniform distribution of the powdered powder of door over the flame cross section, thereby creating conditions for intensive burning of the fuel particles both in the flame axis and on the circumference of the flame cross section.
  • the fuel particles come into direct contact with the surrounding gas medium, which is at a high temperature, from the moment of the outflow from the gate nozzle 4. This leads to their rapid heating and ignition. This creates a flame with a greater thermal stress, the degree of combustion of the fuel during the flight time of the fuel particles from the gate nozzle 4 to the lining to be repaired increases and accordingly the particles of the refractory are heated to a higher temperature.
  • a higher degree of heating of the refractory particles and a higher degree of combustion of the fuel lead to the formation of denser door chalk coatings with a low porosity and a better durability.
  • a higher degree of combustion of the fuel also reduces the consumption of powdered powder.
  • the blow mold is provided with an additional channel 8 for supplying oxygen.
  • This channel 8 is located concentrically on the circumference of the channel 5 for the supply of powdered powder.
  • a gate nozzle 9 is shown, in which the channel for powder gate supply consists of five bores 10 (Fig. 3 and Fig. 4), which are symmetrical to the axis of the gate nozzle 9.
  • Such a construction of the channel for powdered powder feed improves the mixing of powdered powder with oxygen.
  • the number of holes 10 for powdered powder can be from three to eight, it is selected depending on the performance of the blow mold.
  • the additional duct becomes in the case when the duct for powder scraper supply consists of holes 10 to supply oxygen from bores 12 (FIG. 5 and FIG. 6) formed in the gate nozzle 11 and lying between the bores 10 for the supply of powdered gate powder.
  • the main channel 6 for oxygen supply lying along the axis of the gate nozzle 11 has a cross-sectional area which is twice the total cross-sectional area of the additional channel for oxygen supply, i.e. is twice the total cross-sectional area of the bores 12.
  • the main channel 6 for supplying oxygen has a cross-sectional area that is twice as large as the total cross-sectional area of the bores 12.
  • the cross-sectional area of the main channel 6 for supplying oxygen can be 0.5 to 3.0 times the total cross-sectional area of the additional channel for supplying oxygen.
  • the critical total cross-sectional area (narrowest cross-section of a Laval nozzle) of the slit-shaped openings 14 be contributes 0.5 of the area of the main channel 6 to the oxygen supply.
  • Such a construction of the additional channel for supplying oxygen protects the flame against dissolving in the vicinity of the lining and reduces the ejection of the surrounding medium into the flame. This reduces the consumption of garbage powder and improves the durability of the garbage coating produced.
  • the angle of inclination of the slot-shaped openings 14 to the axis of the gate nozzle can be from 7 to 12 °. It is selected depending on the construction of the channel for powdered powder.
  • the critical total cross-sectional area of the slot-shaped openings 14 can be from 0.2 to 1.0 of the cross-sectional area of the main channel 6 for the supply of oxygen. This area is chosen depending on the distance between the blow mold and the lining of a metallurgical aggregate.
  • the blow mold for flame retardation is operated as follows.
  • Water for cooling it is fed into the housing 1 of the blow mold for flame retarding.
  • the blow mold is then inserted into a metallurgical unit.
  • the gate nozzle 4 is oriented towards the area of the lining to be repaired.
  • Torkretpulver is supplied via the pipeline 2 and oxygen via the pipeline 3, which correspondingly flows out of the Torkretdüse 4 via the channels 5 and 6 for the supply of torket powder and oxygen.
  • the gate powder mixes with the oxygen and ignites to form a gate flame.
  • the fuel component of the powdered cork burns and the refractory component heats up of the gate flame and adheres to the lining to be repaired, forming a gate coating with high durability.
  • oxygen is fed into the space of the metallurgical unit via the additional channel 8.
  • the additional oxygen creates a curtain around the jar powder and prevents the jar particles from jumping into the surrounding medium. This increases the degree of utilization of the powdered powder and improves the durability of the powder coating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Nozzles (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
EP86905482A 1986-07-04 1986-07-04 Düse zum heissreperaturspritzen bei metallurgischen anlagen Expired - Lifetime EP0277232B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1986/000069 WO1988000245A1 (en) 1986-07-04 1986-07-04 Tuyere for torch guniting of metallurgical plant

Publications (3)

Publication Number Publication Date
EP0277232A1 EP0277232A1 (de) 1988-08-10
EP0277232A4 EP0277232A4 (de) 1988-10-27
EP0277232B1 true EP0277232B1 (de) 1991-03-06

Family

ID=21617016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86905482A Expired - Lifetime EP0277232B1 (de) 1986-07-04 1986-07-04 Düse zum heissreperaturspritzen bei metallurgischen anlagen

Country Status (8)

Country Link
EP (1) EP0277232B1 (enrdf_load_stackoverflow)
JP (1) JPH01500291A (enrdf_load_stackoverflow)
AT (1) ATE61415T1 (enrdf_load_stackoverflow)
BR (1) BR8607179A (enrdf_load_stackoverflow)
DE (1) DE3677994D1 (enrdf_load_stackoverflow)
HU (1) HU200490B (enrdf_load_stackoverflow)
IN (1) IN165417B (enrdf_load_stackoverflow)
WO (1) WO1988000245A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990012894A1 (en) * 1989-04-20 1990-11-01 Gosudarstvenny Proektny I Nauchno-Issledovatelsky Institut Nikelevo-Kobaltovoi Promyshlennosti (Gipronikel) Gunite burner for torch-guniting of metallurgical plants
GB2300905A (en) * 1995-05-17 1996-11-20 Terence William Joyce Cooled tuyere
JP7134594B2 (ja) 2016-03-18 2022-09-12 日東電工株式会社 絶縁樹脂材料、それを用いた金属層付絶縁樹脂材料および配線基板

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU914636A1 (ru) * 1979-04-16 1982-03-23 Do Nii Chernoj Metallurgii Способ факельного торкретирования футеровки металлургических агрегатов 1 2
SU964006A1 (ru) * 1979-05-30 1982-10-07 Донецкий научно-исследовательский институт черной металлургии Фурма дл факельного торкретировани футеровки металлургических агрегатов
JPS597911B2 (ja) * 1979-05-30 1984-02-21 ドネツキイ ナウチノ イスレドバテルスキイ インステイテユトチエルノイ メタル−ルギイ 火炎溶射ランス
DE3266479D1 (en) * 1981-04-06 1985-10-31 Kawasaki Steel Co Lance for repairing refining vessel

Also Published As

Publication number Publication date
HUT46745A (en) 1988-11-28
JPH01500291A (ja) 1989-02-02
WO1988000245A1 (en) 1988-01-14
ATE61415T1 (de) 1991-03-15
BR8607179A (pt) 1988-09-13
IN165417B (enrdf_load_stackoverflow) 1989-10-14
EP0277232A4 (de) 1988-10-27
DE3677994D1 (de) 1991-04-11
HU200490B (en) 1990-06-28
EP0277232A1 (de) 1988-08-10

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