US3241825A - Blowing device - Google Patents

Blowing device Download PDF

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Publication number
US3241825A
US3241825A US210668A US21066862A US3241825A US 3241825 A US3241825 A US 3241825A US 210668 A US210668 A US 210668A US 21066862 A US21066862 A US 21066862A US 3241825 A US3241825 A US 3241825A
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US
United States
Prior art keywords
blast tube
downcomer
admixtures
blowing device
annular space
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
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US210668A
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English (en)
Inventor
Jilek Walter
Truppe Meinhard
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BOT Brassert Oxygen Technik AG
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BOT Brassert Oxygen Technik 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
    • C21C5/4606—Lances or injectors

Definitions

  • This invention relates to a blowing device for supplying the refining agent and the admixtures in carrying out metallurgical processes, e.g., in refining or pre-refining crude iron, in refining steel, in the preparation of alloys, and like processes in which the refining agent is supplied from above.
  • Blowing devices for use in surface-blowing processes comprise a blast tube which conducts the refining gas and terminates in a convergent-divergent or de Laval nozzle. It has been proposed to introduce finely divided basic substances such as lime under pressure into the supply conduit of the blowing tube and supply them to the bath as a suspension in the refining gas.
  • These known devices involved various disadvantages. High requirements regarding the purity and the structure of the admixtures had to be met. If the admixtures contained combustible impurities such as coal or iron particles, these impurities were ignited in contact with the oxygen and often caused a destruction of the hose lines. For this reason nickel-chromium steels had to be used as a material for the supply conduits, which rendered the equipment expensive. Besides, devices of this kind were subjected to considerable mechanical wear.
  • a special aim of the invention is to provide a blowing device which allows a controlled supply of the admixtures, without any risk of inflammation and without danger of an excessive wear of the constructive elements, while at the same time the adjustability of the oxygen jet, i.e. the possibility to selectively blow either with a sharp jet or with a gentle jet, is retained.
  • the blowing device according to the invention is characterized in that the blast tube which terminates in a convergent-divergent nozzle is arranged in a concentric watercooled downcomer and adapted to be lifted and lowered therein, the annular space between the blast tube and the downcomer serving for the supply of admixtures.
  • the annular space communicates with a storage container for fine-grained or pulverulent admixtures, e.g. CaO, coke, ion ore and the like, which is under no pressure.
  • a storage container for fine-grained or pulverulent admixtures e.g. CaO, coke, ion ore and the like, which is under no pressure.
  • the supply is effected under no pressure, the abrasive action of the admixtures is slight, and the wear of the conduits insignificant.
  • the mouth portion of the blast tube is shaped to form a fitting part which can be inserted into the mouth portion of the downcomer in such manner that the downcomer is closed when the blast tube is in the lowered position.
  • central blast tube may be adapted to be lifted and lowered by means of a spindle or any other suitable means.
  • the fitting part of the blast tube and the seat part of the downcomer have a cylindrical or frustro-conical shape, the two parts corresponding to each other. From the seat of the downcomer upwards a frustro-conical portion may preferably adjoin, which passes into a cylindrical tube of larger diameter.
  • the device according to the invention thus enables free control both of the quantity of the admixtures added and of the energy of the blowing jet.
  • the cross section of the downcomer may be dimensioned for maximal supply rateswhen the central blast tube is in its topmost position; when the blast tube is in its lowest position, i.e. when the nozzle tip which forms the fitting part is inserted in the seat of the downcomer, the supply of admixtures is interrupted and the nozzle acts as a proper convergentdivergent nozzle.
  • blowing device according to the invention is explained more fully in the accompanying drawing by way of exemplary embodiments.
  • FIG. 1 is a vertical sectional view of an embodiment having a conical fitting part and seat
  • FIG. 2 is a similar representation comprising a cylindrical fitting part and seat
  • numeral 1 designates the blast tube which is arranged in a concentric downcomer and adapted to be lifted and lowered therein.
  • 3 is the annular space between the blast tube and the downcomer.
  • the mouth portion 4 of the blast tube has a convergent portion 5 and a divergent portion 6 and thus acts as a convergent-divergent or de Laval nozzle.
  • the blast tube confines a cylindrical cross section; the lower end of the mouth portion 8 is shaped to form a slightly conical fitting part which fits into the seat 9 provided at the lower end of the downcomer.
  • the downcomer has a cylindrical cross section.
  • the downcomer 2 is a jacket tube, i.e. it consists of the actual inner tube 2 and the outer tube 12, which tubes are integrally connected at their lower ends.
  • concentrically arranged in the jacket space is a guide tube 13 to provide for the circulation of a coolant.
  • the lower end 14 of the guide tube is shaped to form a stream-lined guide body. 15 are spacers.
  • FIG. 2 differs from that according to FIG. 1 only in that the .blast tube 1 has a cylindrical fitting part 16 which Ms in a seat 17 of the downcomer which has likewise cylindrical shape. In this em.- hodiment the outer wall of the blast tube is cylindrical over its entire length.
  • blowing devices illustrated in the drawing are op erated by lifting and lowering the central blast tube by means of a spindle or a similar suitable means. It is evident that the entire cross-sectional area of the annular space is available for conveying the admixtures, when the nozzle tip of the central blast tube is at position 10 or higher. When the blast tube is lowered from this highest position, the annular space is continually decreased until, when the fitting part engages in the seat, the supply of admixtures is finally interrupted. From this position downwards, the blowing device acts as a proper convergent-divergent nozzle. Owing to the solid construction of the mouth portion of the blast tube, damages are reliably avoided.
  • Example 1 Refining of steelmaking iron After formation of a charge from 5,820 kg. liquid crude iron having a composition of: 4.06% C, 0.73% Si, 2.09% Mn, 0.124% P, 0.048% S, and 550 kg. scrap and addition of 50 kg. scarfing scale, 40 kg. bauxite, and 40 kg. fiuorspar, a blowing device of the type illustrated in FIG. 1 was entered into the crucible.
  • the central blast tube had an inside diameter above the throttle portion of 33 mm. and a nozzle diameter of 21 mm.
  • the length of the convergent portion was 20 mm., and the length of the divergent portion 39 mm.
  • the inside diameter of the downcomer above the conical portion was 67 mm.
  • Example 2.C0nversion of basic Bessemer iron and termination of the heat at a desired carbon content A charge of 6,000 kg. liquid crude iron assaying for 3.72% C, 0.35% Si, 0.40% Mn, 1.760% P. 0.033% S, to which 100 kg. bauxite and 50 kg. scarfing scale had been added was blown by means of a blowing device as illustrated in the drawing. The distance of the blowing device was 400 mm.; oxygen pressure 10 kg./cm. gauge.
  • Example 3 Carbarizing and heating of a melt A charge of 5500 kg. of steel having the following composition: 0.04% C, 0% Si, 0.35% Mn, 0.015% P, 0.017%
  • the blowing device illustrated in the drawing was introduced into the crucible, the distance from the bath adjusted to 400 mm., and the oxygen pressure controlled to 5 kg./cm. gauge. During a period of 9 minutes normal m. of oxygen were blown and 220 kg. pitch coke meal supplied through the annular space of the blowing device. Blowing was terminated, the blowing device withdrawn, and a steel sample taken, which had the following composition: 1.02% C, 0% Si, 0.28% Mn, 0.018% P, 0.019% S. The temperature was 1580 C.
  • a blowing device for supplying an oxygen-containing refining gas and admixtures in surface-blowing processes comprising a blast tube terminating in a convergentdivergent nozzle and a downcomer concentrically surrounding the blast tube to provide for an annular space, said blast tube being adapted to be lifted and lowered within said downcomer, said blast tube serving for the supply of the refining gas and said annular space between said blast tube and said downcomer serving for the supply of admixtures in the lifted position of said blast tube, said downcomer including a downwardly and inwardly shaped port-ion adjacent the mouth portion of the downcomer adapted to direct the admixtures into the refining gas supplied from the nozzle of the blast tube, the mouth portion of the blast tube being shaped to form a fitting part adapted to be inserted into the mouth portion of the downcomer, which forms a seat part, the annular space being closed when the blast tube is in the lowered position.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US210668A 1961-07-21 1962-07-18 Blowing device Expired - Lifetime US3241825A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT562061A AT236424B (de) 1961-07-21 1961-07-21 Blaseinrichtung für Aufblaseverfahren

Publications (1)

Publication Number Publication Date
US3241825A true US3241825A (en) 1966-03-22

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US210668A Expired - Lifetime US3241825A (en) 1961-07-21 1962-07-18 Blowing device

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US (1) US3241825A (fi)
AT (1) AT236424B (fi)
DE (1) DE1433418A1 (fi)
FI (1) FI41283C (fi)
GB (1) GB1008723A (fi)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3317309A (en) * 1962-11-30 1967-05-02 Voest Ag Method for melting artificial scrap
US3350080A (en) * 1963-06-22 1967-10-31 Manton Douglas Norman Oxygen lance with helical cooling coil
US3411716A (en) * 1966-05-11 1968-11-19 United States Steel Corp Oxygen lance for steelmaking furnaces
US3439911A (en) * 1963-04-26 1969-04-22 South African Iron & Steel Lance for metal refining
US3459415A (en) * 1965-10-15 1969-08-05 Vyskumny Ustav Kovu Panenske B Apparatus for the continuous production of converter copper
US3521871A (en) * 1965-12-30 1970-07-28 Forderung Der Eisenhuttentechn Lance for blowing gases into contact with molten metal
US3525509A (en) * 1967-04-07 1970-08-25 Berry Metal Co Injection lance with a nozzle adapted for above the bath operation
US3599949A (en) * 1967-02-23 1971-08-17 Steel Co Of Wales Ltd Manufacture of steel
US3938790A (en) * 1969-02-20 1976-02-17 Eisenwerk-Gesellschaft Maximilianshutte Mbh Method and converter for refining pig-iron into steel
US4303230A (en) * 1978-11-28 1981-12-01 William Bleloch Apparatus for the production of steel and iron alloys
US4502633A (en) * 1982-11-05 1985-03-05 Eastman Kodak Company Variable capacity gasification burner
US4752303A (en) * 1982-05-22 1988-06-21 Ruhrchemie Aktiengesellschaft Process for producing synthesis gas by partial oxidation of coal-water suspensions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1758816C2 (de) * 1968-08-13 1975-11-20 Eisenwerk-Gesellschaft Maximilianshuette Mbh, 8458 Sulzbach-Rosenberg Verfahren zum Frischen von Roheisen zu Stahl
CN102828003B (zh) * 2012-09-18 2015-08-19 苏州宝联重工股份有限公司 钢液真空精炼顶枪

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2805147A (en) * 1952-10-02 1957-09-03 Tiroler Roehren & Metallwerk Process and apparatus for introducing fine-grained additions below the surface of metal melts
US2829960A (en) * 1954-01-18 1958-04-08 Henry J Kaiser Company Method and metallurgical device for the refining of steel
US3130252A (en) * 1959-02-20 1964-04-21 Arbed Lances for treatment of metal baths

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2805147A (en) * 1952-10-02 1957-09-03 Tiroler Roehren & Metallwerk Process and apparatus for introducing fine-grained additions below the surface of metal melts
US2829960A (en) * 1954-01-18 1958-04-08 Henry J Kaiser Company Method and metallurgical device for the refining of steel
US3130252A (en) * 1959-02-20 1964-04-21 Arbed Lances for treatment of metal baths

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3317309A (en) * 1962-11-30 1967-05-02 Voest Ag Method for melting artificial scrap
US3439911A (en) * 1963-04-26 1969-04-22 South African Iron & Steel Lance for metal refining
US3350080A (en) * 1963-06-22 1967-10-31 Manton Douglas Norman Oxygen lance with helical cooling coil
US3459415A (en) * 1965-10-15 1969-08-05 Vyskumny Ustav Kovu Panenske B Apparatus for the continuous production of converter copper
US3521871A (en) * 1965-12-30 1970-07-28 Forderung Der Eisenhuttentechn Lance for blowing gases into contact with molten metal
US3411716A (en) * 1966-05-11 1968-11-19 United States Steel Corp Oxygen lance for steelmaking furnaces
US3599949A (en) * 1967-02-23 1971-08-17 Steel Co Of Wales Ltd Manufacture of steel
US3525509A (en) * 1967-04-07 1970-08-25 Berry Metal Co Injection lance with a nozzle adapted for above the bath operation
US3938790A (en) * 1969-02-20 1976-02-17 Eisenwerk-Gesellschaft Maximilianshutte Mbh Method and converter for refining pig-iron into steel
US4303230A (en) * 1978-11-28 1981-12-01 William Bleloch Apparatus for the production of steel and iron alloys
US4752303A (en) * 1982-05-22 1988-06-21 Ruhrchemie Aktiengesellschaft Process for producing synthesis gas by partial oxidation of coal-water suspensions
US4502633A (en) * 1982-11-05 1985-03-05 Eastman Kodak Company Variable capacity gasification burner

Also Published As

Publication number Publication date
GB1008723A (en) 1965-11-03
FI41283C (fi) 1969-10-10
FI41283B (fi) 1969-06-30
AT236424B (de) 1964-10-26
DE1433418A1 (de) 1969-03-20

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