US3794308A - Device for injecting hot gases into a shaft furnace - Google Patents

Device for injecting hot gases into a shaft furnace Download PDF

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Publication number
US3794308A
US3794308A US00310798A US3794308DA US3794308A US 3794308 A US3794308 A US 3794308A US 00310798 A US00310798 A US 00310798A US 3794308D A US3794308D A US 3794308DA US 3794308 A US3794308 A US 3794308A
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US
United States
Prior art keywords
nozzle
longitudinal unit
connector
terminal element
inner tube
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
US00310798A
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English (en)
Inventor
N Ponghis
C Vanosmael
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Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres

Definitions

  • the device has a longitudinal unit comprising an outer metal tube and an inner refractory tube A liquidcooled nozzle at one end of the unit converges to a narrow outlet. A terminal element at the other end of the unit serves to connect the device to the outer furnace wall, to connect the bore of the longitudinal unit to a hot gas supply, and to connect the device to a cooling liquid supply.
  • the present invention relates 'to an injection device for injecting into a shaft furnace (particularly'a blast furnace) hot gases of a reducing nature for preference, such as gases mainly containing CO and/or H and/or hydrocarbons, these gases being liable moreover in particular to contain CO and/or H O and/or N
  • gases of a reducing nature for preference such as gases mainly containing CO and/or H and/or hydrocarbons, these gases being liable moreover in particular to contain CO and/or H O and/or N
  • the devices employed should be able to withstand temperatures of the order of 1000C to l250C, to give rise to only small heat losses and to be gas-tight.
  • these devices should have a quite specific internal profile.
  • the gases to be injected contain reducing gases in particular, such as CO and H and are at high temperature
  • the material forming these injection devices is in contact with a very corrosive environment, which this material has to be able to withstand chemically and mechanically, failing which the internal profile of the devices runs the risk of undergoing rapid deterioration with the consequent appearance of fluid flow impairment in these devices and impairment of the penetration into the shaft furnace.
  • the present invention provides a device for injecting hot gases into a shaft furnace, the device comprising:
  • a longitudinal unit comprising two co-axial tubes, the outer tube being of a metallic substance having satisfactory mechanical strength and chemical resistance at high temperature, and the inner tube being of non-metallic refractory substance and having a central bore of constant'diameter and an internal surface of uniform smoothness;
  • a terminal liquid-cooled nozzle extending the longitudinal .unit and constituting an outlet for the hot gases to be injected, the internal bore of the nozzle having a convergent portion followed by a parallelsided neck;
  • a terminal element on the end of the longitudinal unit opposite to the nozzle comprising a collar adapted for fastening to the outer wall of a shaft furnace, and a connector adapted to connect the bore of the longitudinal unit to a hot gas supply and having an inlet and an outlet for circulation of cooling liquid;
  • the metallic substance forming the outer tube of the longitudinal unit to consist of alloy steel or so-called special steel, preferably stainless steel.
  • the non-metallic substance forming this tube advantageously consists of a very fine-grained castable refractory concrete posessing considerable restance as that of the outer tube of the longitudinal unit, -or a metallic substance possessing high thermal conductivity, preferably copper.
  • the collar of the terminal element preferably an annular flange
  • intended for fastening to the outer wall of the shaft furnace advantageously consists of a metallic substance, possibly being the same as that forming the outer tube of the longitudinal unit. This collar may form anextension of the outer tube of the longitudinal element to which it is secured by means of a frustoconical connecting piece, also consisting of metal, and by appropriate connections, for example welded joints.
  • the connector or thicker part of the annular flange or terminal element may consist of a non-metallic refractory substance, preferably being the same as that of the inner tube of the longitudinal unit, of which it forms the extension and, in this preferred case, with which it forms a single piece.
  • the thicker part of the annular flange may alternatively consist of a metallic substance and forms a single piece with the collar.
  • the water or the cooling liquid circulation circuit may advantageously comprise, on the one hand, a water inlet and a water outlet which are situated at the periphery of the annular flange and, on the other hand, a circular part in the said annular flange, a rectilinear part traversing the longitudinal unit and a terminal part formed by the circuit appertaining to the nozzle extending the longitudinal unit.
  • the circular part of the water circulation cooling circuit situated within the annular flange advantageously comprises two separate annular chambers of whichone is intended to be connected to a water feed pipe and of which the other is intended'to be connected to a water discharge pipe, the connection between the first and second chambers consisting of the rectilinear part of the circuit traversing the longitudinal unit and of the terminal circuit appertaining to the nozzle.
  • the circular part of the water circulation cooling circuit situated within the annular flange may be independent of the other two parts, evidently having a water inlet and outlet which are also separate.
  • the rectilinear part of the water circulation cooling circuit traversing the longitudina element advantageously consists of pipes partially housed within the thickness of the wall of the outer tube and partially within the thickness of the wall of the inner tube, two pipes which are intended for the outward flow, are diametrically opposed and displaced through with respect to the two pipes intended for the return flow, preferably being incorporated.
  • F 1G. 1 is a longitudinal section through a hot gas injection device mounted in the wall of a blast furnace;
  • FIG. 2 is a transverse section through the device.
  • This injection device comprises a longitudinal unit 1, a terminal nozzle 2 extending the unit 1, a terminal element 3 at the other end of the unit, and a water circulation cooling circuit.
  • the longitudinal unit 1 consists of two co-axial tubes 4 and 5.
  • the outer tube 4 is of stainless steel possessing satisfactory mechanical strength and chemical resistance at high temperatures.
  • the inner tube 5 lines the tube 4 and has a central bore 6 of constant diameter and an internal surface of uniform smoothness. To this end, it consists of a very fine-grained castable refractory concrete also possessing great strength at high temperatures.
  • the nozzle 2 intended to form the outlet for the hot gases to be injected, is in the form of a conventional tuyere of the type employing cooling by circulation of water.
  • the internal profile of this nozzle comprises a convergent part 7 followed by a parallel-sided neck 8.
  • the nozzle consists of copper to ensure satisfactory heat transmission and is secured to the outer tube 4 by means of a welded joint 9.
  • the terminal element 3 consists of two parts a collar or annular flange 10 and a connector 11 which are joined to each otherl
  • the flange 10 is fastened to the outer wall of the shaft furnace and is made of the same stainless steel as that of the outer tube 4 of which it forms an extension.
  • This annular flange 10 is fastened to the outer tube 4 by means of a frustoconical connecting piece 12, of the same material, by welded joints l3 and 14.
  • the connector 11, which is thicker than the flange 10 is connected to the feedpiping system of the hot gases to be injected, and also contains a cooling circuit.
  • This connector 11 is made of the same nonmetallic refractory substance as the inner tube 5, of which it forms an extension and with which it forms a single piece.
  • the cooling circuit whose inlet 15 and outlet 16 are situated at the periphery of the terminal element 3, comprises a circular part within the terminal element, a rectilinear part traversing the longitudinal unit 1, and
  • the part of the circuit situated within the terminal element 3 comprises two separate annular chambers 17 and 18, of which one 17 is connected to a water feed pipe 19 and of which the other 18 is connected to a water discharge pipe 20.
  • the connection between the chambers 17 and 18 and the rectilinear part in the longitudinal unit 1 is by means of elbow pipes 21 and 22 housed within the refractory material of the connector 11.
  • the rectilinear part of the water circulation cooling circuit traversing the longitudinal unit 1 consists of pipes 23 and 24 partially housed within the thickness of the wall of the outer tube 4 and partially within the thickness of the wall of the inner tube 5. There are two pipes 23.
  • the circuit appertaining to the nozzle 2 receives water from an extension 25 of the outward pipes 23 and discharges water to an extension 26 4 of the return pipes 24.
  • the pipes 21 to 26 are of stainless steel.
  • a device for injecting hot gases into a shaft furnace comprising:
  • a longitudinal unit comprising two co-axial tubes, the outer tube being of a metallic substance having satisfactory mechanical strength and chemical resistance at high temperatures, and the inner tube being of non-metallic refractory substance and having a central bore of constant diameter and an internal surface of uniform smoothness;
  • a terminal liquid-cooled nozzle extending in the longitudinal unit and constituting an outlet for the hot gases to be injected, the internal bore of the nozzle having a convergent portion followed by a parallel-sided neck.
  • a terminal element on the end of the longitudinal unit opposite to the nozzle comprising a collar adapted for fastening to the outer wall of a shaft furnace, and a connector adapted to connect the bore of the longitudinal unit to a hot gas supply and having an inlet and an 7 outlet for circulation of cooling liquid, and
  • a device as claimed in claim 2, wherein the alloy steel is stainless steel.
  • a device as claimed in claim 1, wherein the nozzle is made of the same metallic substance as that ofthe outer tube of the longitudinal unit.
  • a device as claimed in claim 11, wherein the connector is made of the same non-metallic refractory substance as that of the inner tube of the longitudinal unit.
  • the circular part of the cooling circuit comprises two separate annular chambers, one connected to the liquid inlet and the other connected to the liquid outlet, the first and second chambers being connected by the rectilinear part of the circuit traversing the longitudinal unit and the terminal circuit of the nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Blast Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
US00310798A 1971-11-30 1972-11-30 Device for injecting hot gases into a shaft furnace Expired - Lifetime US3794308A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE776093A BE776093A (fr) 1971-11-30 1971-11-30 Dispositif d'injection de gaz chauds dans les fours a cuve.

Publications (1)

Publication Number Publication Date
US3794308A true US3794308A (en) 1974-02-26

Family

ID=3858948

Family Applications (1)

Application Number Title Priority Date Filing Date
US00310798A Expired - Lifetime US3794308A (en) 1971-11-30 1972-11-30 Device for injecting hot gases into a shaft furnace

Country Status (10)

Country Link
US (1) US3794308A (fr)
JP (1) JPS4863935A (fr)
BE (1) BE776093A (fr)
CA (1) CA967001A (fr)
DE (1) DE2257667C3 (fr)
FR (1) FR2163180A5 (fr)
GB (1) GB1354628A (fr)
IT (1) IT975750B (fr)
LU (1) LU66480A1 (fr)
NL (1) NL7216180A (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971548A (en) * 1974-03-20 1976-07-27 Allmanna Svenska Elektriska Aktiebolaget Metallurgical furnace having a blast injection nozzle
US4138098A (en) * 1975-08-14 1979-02-06 Creusot-Loire Method of blowing smelting shaft furnaces and tuyeres used for said blowing
US4211316A (en) * 1978-12-28 1980-07-08 Pullman Berry Company Chute for charging steel making vessels
US4239194A (en) * 1978-06-23 1980-12-16 Hainaut-Sambre Societe Anonyme Tuyere for the bottom of a steelworks converter
US4572482A (en) * 1984-11-19 1986-02-25 Corcliff Corporation Fluid-cooled metallurgical tuyere
US4930757A (en) * 1989-10-02 1990-06-05 Cominco Ltd. Tuyere for metallurgical vessels
RU2150511C1 (ru) * 1999-10-04 2000-06-10 ОАО "Нижнетагильский металлургический комбинат" Воздушная фурма доменной печи
KR100388233B1 (ko) * 2000-12-20 2003-06-19 주식회사 포스코 노벽 보수후 노심코크스 승열방법
RU2280698C1 (ru) * 2005-02-21 2006-07-27 ОАО "Западно-Сибирский металлургический комбинат" Воздушная фурма доменной печи
US20080169028A1 (en) * 2005-02-10 2008-07-17 Wahl Refractory Solutions, Llc Blaster Nozzle
WO2009105721A2 (fr) 2008-02-20 2009-08-27 Zerog Wireless, Inc. Dispositif de point d'accès sans fil
EP4217512A1 (fr) * 2020-09-28 2023-08-02 Paul Wurth S.A. Haut-fourneau avec alimentation en arbre de gaz de traitement chaud

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3342473A (en) * 1964-01-20 1967-09-19 Jr Herbert A White Apparatus for delivering air and fuel to a blast furnace

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3342473A (en) * 1964-01-20 1967-09-19 Jr Herbert A White Apparatus for delivering air and fuel to a blast furnace

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971548A (en) * 1974-03-20 1976-07-27 Allmanna Svenska Elektriska Aktiebolaget Metallurgical furnace having a blast injection nozzle
US4138098A (en) * 1975-08-14 1979-02-06 Creusot-Loire Method of blowing smelting shaft furnaces and tuyeres used for said blowing
US4239194A (en) * 1978-06-23 1980-12-16 Hainaut-Sambre Societe Anonyme Tuyere for the bottom of a steelworks converter
US4211316A (en) * 1978-12-28 1980-07-08 Pullman Berry Company Chute for charging steel making vessels
US4572482A (en) * 1984-11-19 1986-02-25 Corcliff Corporation Fluid-cooled metallurgical tuyere
US4930757A (en) * 1989-10-02 1990-06-05 Cominco Ltd. Tuyere for metallurgical vessels
RU2150511C1 (ru) * 1999-10-04 2000-06-10 ОАО "Нижнетагильский металлургический комбинат" Воздушная фурма доменной печи
KR100388233B1 (ko) * 2000-12-20 2003-06-19 주식회사 포스코 노벽 보수후 노심코크스 승열방법
US20080169028A1 (en) * 2005-02-10 2008-07-17 Wahl Refractory Solutions, Llc Blaster Nozzle
US7968047B2 (en) * 2005-02-10 2011-06-28 Wahl Refractory Solutions, Llc Blaster nozzle
US8287803B2 (en) 2005-02-10 2012-10-16 Wahl Refractory Solutions, Llc Blaster nozzle
RU2280698C1 (ru) * 2005-02-21 2006-07-27 ОАО "Западно-Сибирский металлургический комбинат" Воздушная фурма доменной печи
WO2009105721A2 (fr) 2008-02-20 2009-08-27 Zerog Wireless, Inc. Dispositif de point d'accès sans fil
EP4217512A1 (fr) * 2020-09-28 2023-08-02 Paul Wurth S.A. Haut-fourneau avec alimentation en arbre de gaz de traitement chaud

Also Published As

Publication number Publication date
DE2257667A1 (de) 1973-06-07
DE2257667C3 (de) 1979-11-15
BE776093A (fr) 1972-03-16
GB1354628A (en) 1974-06-05
IT975750B (it) 1974-08-10
JPS4863935A (fr) 1973-09-05
NL7216180A (fr) 1973-06-04
DE2257667B2 (de) 1979-03-29
FR2163180A5 (fr) 1973-07-20
CA967001A (en) 1975-05-06
LU66480A1 (fr) 1973-02-01

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