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EP0346615B1 - Vorrichtung zum Einblasen vorgewärmter Luft in einen Schachtofen - Google Patents

Vorrichtung zum Einblasen vorgewärmter Luft in einen Schachtofen Download PDF

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Publication number
EP0346615B1
EP0346615B1 EP89108668A EP89108668A EP0346615B1 EP 0346615 B1 EP0346615 B1 EP 0346615B1 EP 89108668 A EP89108668 A EP 89108668A EP 89108668 A EP89108668 A EP 89108668A EP 0346615 B1 EP0346615 B1 EP 0346615B1
Authority
EP
European Patent Office
Prior art keywords
coils
preheated air
air
cooling
furnace
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
EP89108668A
Other languages
English (en)
French (fr)
Other versions
EP0346615A1 (de
Inventor
Marc Solvi
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.)
Paul Wurth SA
Original Assignee
Paul Wurth 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 Paul Wurth SA filed Critical Paul Wurth SA
Priority to AT89108668T priority Critical patent/ATE87980T1/de
Publication of EP0346615A1 publication Critical patent/EP0346615A1/de
Application granted granted Critical
Publication of EP0346615B1 publication Critical patent/EP0346615B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/163—Blowpipe assembly

Definitions

  • the present invention relates to a device for injecting preheated air into a shaft furnace, composed of several tubular elements provided with an internal refractory lining and connected, on one side, by an elbow, a nozzle and a nozzle to the wall of the furnace and, on the other side, to a main circular duct arranged around the furnace and supplied with preheated air by an installation comprising a blower, several cowpers and a mixing chamber.
  • wind-carrier A device of this kind, more generally known under the name of "wind-carrier” is known from US Pat. No. 3,766,868.
  • These wind-carriers are arranged, in a relatively large number, around the base of an oven, for example d '' a blast furnace, with a view to injecting hot air into it to maintain the combustion and reduction process in the furnace.
  • the air is injected at a temperature of the order of 1200 ° C. or more and the heating to this temperature is carried out in air heaters commonly called “cowpers”.
  • these must have a thick refractory lining on the one hand, to avoid heat loss and, on the other hand, to protect the metal shielding. outside against thermal radiation and high air temperature.
  • the high thickness of this refractory lining adversely affects the manufacturing price of the wind carriers, and further increases the weight and size thereof.
  • a more advantageous alternative has so far not been possible.
  • the object of the present invention is to provide a new wind carrier whose refractory lining, with at least equal performance, is thinner than those of known wind carriers.
  • the invention provides a device of the type described in the preamble which is essentially characterized by cooling coils embedded in the mass of the refractory lining and supplied with cooling air circulating through the coils in the same direction as the preheated air, the outlet of the coils opening into the internal channel conveying the preheated air.
  • These coils extend, preferably, from the region of the circular conduit to the nozzle.
  • These coils which may consist of copper pipes, are preferably divided into several independent sections, each opening into the internal channel.
  • the device comprises means allowing the cooling air circulating in the coils to be at least part of the cold air sent by the blower into the mixing chamber for adjusting the the temperature of the preheated air.
  • the cold air which was previously sent into the mixing chamber for adjusting the temperature of the preheated air in the cowpers is, in the device according to the present invention, mixed, at least partially, with the preheated air inside the wind carriers to provide the same temperature control effect. There is therefore no need to provide an additional fan to supply the cooling coils of the wind carrier according to the present invention.
  • FIG. 1 shows a schematic vertical section through a wind carrier according to the present invention
  • FIG. 2 represents a block diagram illustrating the feeding of the cooling snakes of the wind carrier.
  • the wind carrier shown in Figure 1 comprises a straight tubular element 10 whose upper end is articulated on a tube 12 which is clamped on the circular pipe not shown and whose lower end is articulated on a tube 14 which is clamped on the upper end of a bend 16 whose opposite end is fixed to a nozzle 18.
  • the tip of this nozzle 18 communicates by a ball joint with a nozzle by which the preheated air is injected into the oven not shown .
  • the joints on either side of the pipe 10 can be produced, in a manner known per se, by cardan couplings 22, 24, associated with bellows compensators 26, 28 to ensure sealing.
  • All the elements of the blower have an interior refractory coating 30 which is applied to the interior surface of an exterior metal shielding 32. It is therefore this refractory coating 30 which defines the channel 34 through which the preheated air passes through the door. -wind.
  • This refractory lining 30 has the dual function of avoiding heat losses from the preheated air passing through the channel 34 and of protecting the metal shield 32 against excessive temperatures.
  • cooling of the refractory lining 30 is provided by means of coils 36 which are embedded in the mass of the lining 30 in the immediate vicinity of the shielding 32.
  • the protection and insulation function of the shielding 32 ensured in the wind carriers known by the refractory lining is therefore, at least in part, provided in the device according to the present invention by the coils 36, so that the thickness of the refractory lining 30 can be considerably reduced since the insulation formed by the streamers is regenerated into permanently thanks to air circulation.
  • the coils 36 can be made of copper tubes with an internal diameter of 1 to 2 cm.
  • the cooling circuit is preferably made up of several independent sections, in this case three sections, the first section 36a operating in the straight section of the wind carrier, the second section 36b operating in the elbow and the third section 36c evolving in the nozzle 18.
  • Each of the cooling sections 36a, 36b, 36c has an inlet E and an outlet S for the cooling fluid which therefore circulates in the direction of propagation of the preheated air through the channel 34.
  • cold air from the installation for producing preheated air is used as cooling agent, this cooling air being mixed, in the wind carrier, with the preheated air to adjust the temperature. This is the reason why all the outputs S of the three cooling sections are directed into channel 34.
  • the supply of the three cooling circuits of a blower 40 is schematically illustrated in FIG. 2.
  • the references 42 and 44 designate a battery of cowpers in which the cold air coming from a blower 46 is heated, in a manner known per se, at the required temperature.
  • the concept "cold air” is entirely relative since the "cold” air already has a temperature of the order of 100 ° C., as a result of heating in the blower 46. Being given that the air is injected into the oven at a well-determined temperature, as constant as possible, of the order of 1200 degrees, the preheated air leaving the cowpers 42 and 44 must be at a higher temperature.
  • the present invention proposes to use at least part of the cold air intended for the mixing chamber 48 to supply the cooling circuits of the blower 40.
  • the three cooling circuits are therefore connected through conduits 56a, 56b , 56c to the cold air line entering the mixing chamber 48 between the latter and the automatic valve 50.
  • the temperature of the preheated air is regulated by the controlled addition of cold air. in the mixing chamber 48 and partly inside the wind carriers 40. Consequently, the cooling of the wind carriers 40 does not disturb the temperature of the preheated air and does not require additional blowers.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (5)

  1. Vorrichtung zum Einblasen von vorerhitzter Luft in einen Schachtofen, wobei diese Vorrichtung aus mehreren rohrförmigen Bauteilen besteht, die mit einer feuerfesten Auskleidung (30) versehen sind, und auf der einen Seite über ein Kniestück (16), ein Düsenrohr (18) und eine Düse (20) mit der Wand des Ofens verbunden sind, und auf der anderen Seite mit einer kreisförmigen Haupt-Rohrleitung verbunden sind, die um den Ofen herum angeordnet ist und über eine Anlage, die ein Gebläse (46), mehrere Cowpers (42), (44), und eine Mischkammer (48) aufweist, mit vorerhitzter Luft versorgt wird, gekennzeichnet durch Kühlschlangen (36), die in die Masse der feuerfesten Auskleidung (30) eingebettet sind und mit Kühlluft versorgt werden, die in der gleichen Richtung wie die vorerhitzte Luft strömt, und daß der Auslaß (S) der Kühlschlangen in den inneren Kanal (34) mündet, der die vorerhitzte Luft befördert.
  2. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, daß die Kühlschlangen (36) sich von dem Gebiet der kreisförmigen Rohrleitung bis in das Düsenrohr (18) erstrecken.
  3. Vorrichtung gemäß irgendeinem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Kühlschlangen (36) aus mehreren, voneinander unabhängigen Abschnitten (36a), (36b), (36c) bestehen, von denen jeder in den inneren Kanal (34) mündet.
  4. Vorrichtung gemäß irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kühlschlangen (36) aus Kupferrohren bestehen.
  5. Vorrichtung gemäß irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie Mittel aufweist, die ermöglichen, daß für die durch die Kühlschlangen (36) strömende Kühlluft mindestens ein Teil der kalten Luft genommen wird, die zur Regelung der Temperatur der vorerhitzten Luft von dem Gebläse (46) nach der Mischkammer (48) befördert wird.
EP89108668A 1988-06-13 1989-05-13 Vorrichtung zum Einblasen vorgewärmter Luft in einen Schachtofen Expired - Lifetime EP0346615B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89108668T ATE87980T1 (de) 1988-06-13 1989-05-13 Vorrichtung zum einblasen vorgewaermter luft in einen schachtofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU87240A LU87240A1 (fr) 1988-06-13 1988-06-13 Dispositif d'injection d'air prechauffe dans un four a cuve
LU87240 1988-06-13

Publications (2)

Publication Number Publication Date
EP0346615A1 EP0346615A1 (de) 1989-12-20
EP0346615B1 true EP0346615B1 (de) 1993-04-07

Family

ID=19731059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108668A Expired - Lifetime EP0346615B1 (de) 1988-06-13 1989-05-13 Vorrichtung zum Einblasen vorgewärmter Luft in einen Schachtofen

Country Status (6)

Country Link
EP (1) EP0346615B1 (de)
AT (1) ATE87980T1 (de)
AU (1) AU608710B2 (de)
CA (1) CA1317157C (de)
DE (1) DE68905862T2 (de)
LU (1) LU87240A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102914144A (zh) * 2011-08-01 2013-02-06 Sab有限公司 鼓风口弯头

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE546593C (de) * 1932-03-16 Hundt & Weber Vormals Metallwe Vorrichtung zum Kuehlen von Hochofenformen durch Druckluft
FR2101124A7 (en) * 1970-08-25 1972-03-31 Floch Jean Le Blast furnace tuyere - which can be dismantled by manipulator and has efficient cooling system
US3766868A (en) * 1972-02-22 1973-10-23 Anciens Etablissements P Warth Tuyere stock for furnaces
AU474212B2 (en) * 1973-02-14 1974-08-15 Kurimoto Ironworks, Ltd A tuyere fora meeting furnace
AU477764B2 (en) * 1974-03-05 1975-09-11 Metallurgichesky Etc Blast-furnace tuyere

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102914144A (zh) * 2011-08-01 2013-02-06 Sab有限公司 鼓风口弯头
CN102914144B (zh) * 2011-08-01 2016-04-27 Sab有限公司 鼓风口弯头

Also Published As

Publication number Publication date
LU87240A1 (fr) 1990-02-28
DE68905862T2 (de) 1993-07-15
DE68905862D1 (de) 1993-05-13
ATE87980T1 (de) 1993-04-15
EP0346615A1 (de) 1989-12-20
AU3522389A (en) 1989-12-14
AU608710B2 (en) 1991-04-11
CA1317157C (en) 1993-05-04

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