EP0576869A2 - Verfahren und Vorrichtung zum Einblasen von Kohlenstaub in einen Hochofen - Google Patents

Verfahren und Vorrichtung zum Einblasen von Kohlenstaub in einen Hochofen Download PDF

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Publication number
EP0576869A2
EP0576869A2 EP93109093A EP93109093A EP0576869A2 EP 0576869 A2 EP0576869 A2 EP 0576869A2 EP 93109093 A EP93109093 A EP 93109093A EP 93109093 A EP93109093 A EP 93109093A EP 0576869 A2 EP0576869 A2 EP 0576869A2
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EP
European Patent Office
Prior art keywords
lance
annular
block
mouth
pulverized coal
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.)
Granted
Application number
EP93109093A
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English (en)
French (fr)
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EP0576869B1 (de
EP0576869A3 (de
Inventor
Léon Ulveling
Yvon Kroemmer
Charles Schmit
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
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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
Priority claimed from LU88139A external-priority patent/LU88139A1/fr
Application filed by Paul Wurth SA filed Critical Paul Wurth SA
Publication of EP0576869A2 publication Critical patent/EP0576869A2/de
Publication of EP0576869A3 publication Critical patent/EP0576869A3/xx
Application granted granted Critical
Publication of EP0576869B1 publication Critical patent/EP0576869B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21B5/003—Injection of pulverulent coal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres

Definitions

  • the present invention relates to a method for the combined injection of pulverized coal and a gaseous oxidizer into a blast furnace crucible by means of a lance opening into a hot-wind nozzle.
  • This injection of pulverized coal is conventionally carried out by an injection lance in the hot wind at a certain distance upstream from the mouth of the nozzle in the crucible.
  • the pulverized coal is suspended in an inert gas.
  • the oxidizer is either constituted by the hot wind, enriched or not with oxygen, or by pure oxygen, brought by a separate pipe near the mouth of the lance. In the latter case, pure oxygen is used to form a primary combustible mixture with the pulverized coal at the outlet of the lance, and the hot wind constitutes the secondary combustion air.
  • German patent specification DE-4008963 C1 there is known a process for the combined injection of pulverized coal and oxygen in a blast furnace crucible by means of a lance opening with one end in a hot-wind nozzle.
  • the lance body comprises an inner tube for pulverized coal and an outer tube forming with said inner tube an annular conduit for oxygen.
  • the jet of pulverized coal is directly surrounded at its periphery by a jet of annular oxygen.
  • the difficulty in obtaining complete combustion in said turbulent zone is due on the one hand to the short distance available and on the other hand to the high speed of the hot wind in the nozzle.
  • the compact jet of coal pulverized in suspension in a neutral gas must be dissociated, the isolated particles of coal must be reheated until causing the release of pyrolysis gas, the pyrolysis gases must mix with the oxidizer, the ignition of this gas mixture must take place and the solid residues from the pyrolysis must react with the oxidant in a heterogeneous oxidation reaction.
  • One of the major problems of injecting pulverized coal into the crucible is therefore to increase the kinetics of the course of these combustion mechanisms described very briefly above.
  • the aim of the present invention is to present a new process for the combined injection of coal pulverized and a gaseous oxidizer in a blast furnace crucible, by means of a lance leading into a hot-wind nozzle, which makes it possible to appreciably improve the combustion efficiency, especially when working with high flow rates of pulverized coal.
  • This objective is achieved by a process characterized in that, at the mouth of the nozzle in the crucible, the pulverized coal is injected in the hot wind in the form of a hollow annular jet and the oxidant gas is injected into the inside said hollow annular jet.
  • the pulverized coal is therefore no longer injected in the form of a full compact jet but rather in the form of a hollow annular jet.
  • This procedure has the direct advantage that the jet is more easily dissociable into isolated particles than a full compact jet carrying the same flow rate of pulverized coal.
  • the outside surface of the jet is increased, as well as the thickness of the jet is reduced, which exposes the isolated particles of carbon more directly to radiation.
  • the oxidizing gas for example oxygen
  • oxygen is no longer injected around the jet of pulverized coal, but it is introduced directly into the hollow of the annular jet of pulverized coal.
  • the oxidizer no longer constitutes a cold screen between the hot wind and the jet of pulverized coal.
  • the annular jet of pulverized coal is exposed with its exterior surface to hot wind, and with its interior surface to gaseous oxidizer.
  • the particles of carbon in the annular jet are consequently contained in a thin layer sandwiched between two streams of oxidizers, which has a beneficial influence on the rapid formation of a flammable mixture.
  • the injection of pulverized coal and of the gaseous oxidant is carried out at the mouth of the nozzle in the crucible.
  • the injection of pulverized coal had to be done at a certain distance upstream from said mouth, so as to increase the path available for the unwinding of the combustion mechanism.
  • the dissociation of the coal jet takes place almost immediately at the outlet of the nozzle. It follows that the path required for the combustion mechanism to run is extremely short, and that an injection lance can almost penetrate the crucible without reducing the combustion efficiency.
  • a direct advantage of this characteristic is that the hot wind duct of the nozzle is less stressed from the thermal point of view.
  • hot ashes stick to the cold walls of the nozzle, which not only has a beneficial effect on the lifetime of the latter, but also prevents clogging of the hot wind pipe by the ashes.
  • the injection of pulverized coal and of the oxidant at the mouth of the nozzle into the crucible consequently makes it possible to increase the life of the nozzles equipped with an injection of pulverized coal, without however reducing the combustion efficiency. .
  • the present invention also provides a lance for implementing the method.
  • This lance comprises in a lance body separate conduits for the pulverized coal and the gaseous oxidizer and is characterized in that said lance body has at its end opening into the hot-wind nozzle an injection mouth for the pulverized coal disposed annularly around an injection mouth for the oxidizing gas.
  • Said lance body advantageously comprises an inner tube forming an inner conduit for the gaseous oxidizer and an outer tube surrounding the inner tube, so as to define with the latter an annular conduit for pulverized coal.
  • a device for connecting the lance body to a distribution network of pulverized coal suspended in an inert gas and to a distribution network of a gaseous oxidant, for example oxygen, is preferably located outside the hot wind duct. This device is then mounted on the end of the lance body which is opposite the end opening into the nozzle, which allows easy introduction of the lance body through a sleeve penetrating the duct of the hot wind.
  • An objective sought in a preferred embodiment of a connection device is to avoid any wear by the abrasive flow of pulverized coal.
  • connection device comprises first channels connecting the first connection sleeve to said annular conduit and second channels arranged between said first channels to connect the second connection sleeve to said interior conduit.
  • gaseous oxidant channels must not pass through the pulverized coal flow and are therefore not subject to wear by this highly abrasive flow.
  • connection device advantageously comprises a distribution block provided with two opposite faces, said lance body opening out through one of said faces and said first connection sleeve opening out in the axial extension of said lance body through the opposite surface in the block distribution, the latter being provided with a central blind bore axially extending said inner conduit, with an annular cavity extending axially said annular conduit, by at least two first channels arranged symmetrically around said central bore and opening on one side into said annular cavity and on the other side into said first connector sleeve, by at least one second channel arranged between said first channels and connecting said central bore to said second connector sleeve.
  • this embodiment of said connecting device is particularly compact while having a design which advantageously avoids any wear by the abrasive flow of the pulverized coal.
  • the pulverized coal is introduced almost axially into said annular duct of the lance, in a flow with symmetry of revolution and without imposing significant changes in direction on it.
  • the annular cavity extending axially said annular duct in the distribution block advantageously has a section which continuously decreases from the mouth of said first channels towards the mouth of said annular duct. It will be noted that this execution also avoids any discontinuity in the internal walls of the distribution block.
  • a preferential execution of the supply of gaseous oxidant comprising an annular peripheral chamber into which several of said second channels open around said central channel, has the advantage of reducing the pressure drop of the flow of gaseous oxidant at the device fitting.
  • connection device advantageously consists of two semi-blocks assembled axially by screws.
  • the inner tube is then fixed to the first semi-block and the outer tube to the second semi-block.
  • Said external duct is advantageously provided with a flange which is fixed by screws to said second semi-block.
  • An interesting variant of the proposed lance includes: a lance body opening with one end into a hot-wind nozzle of a crucible of a shaft furnace, in particular a blast furnace, said lance body including an inner tube forming an inner conduit for the gaseous oxidizer and a tube outside surrounding the inner tube so as to define with the latter an annular duct for the pulverized coal; a distribution device for connecting the inner tube to a supply circuit for the gaseous oxidizer and said annular duct to a supply circuit for the pulverized coal, means for electrically isolating said inner tube from said outer tube, and means for applying a potential difference between the outer tube and the inner tube and thus creating an electric field in said annular channel.
  • the main advantage of this variant is to be able to subject the stream of pulverized coal in a simple and effective manner to the action of an electric field; which has a favorable influence on the kinetics of combustion at the outlet of the lance, in particular on the formation of a reactive mixture between the particles of coal, which are suspended in an inert gas, and the oxidizing gas. It will be noted that the length of this electric field can be equal to the length of the lance body.
  • Said dispensing device of this variant advantageously comprises a dispensing block made of a hard dielectric material, that is to say which is very resistant to wear by pulverized coal. It is for example a ceramic material, in particular a material ceramic based on aluminum oxide. Thanks to this distribution block made of dielectric material, it is possible to solve in a simple and effective manner the problems of electrical insulation between the outer tube and the inner tube of the lance body.
  • This distribution block is advantageously a prismatic block having a first and a second base and several lateral surfaces and being provided with: a blind central bore in said first base for receiving one end of said inner tube; a cavity opening into said second base; channels surrounding said central bore and extending said cavity to open into said first base; a first lateral bore located between said channels, so as to define a mouth in a first lateral surface and to open into said central bore; and a second lateral bore located between said channels and defining a mouth in a second lateral surface and opening into said central bore.
  • said distribution device advantageously comprises: a first front plate which rests on said second base of said prismatic block and which supports in the extension of said cavity a connection sleeve for pulverized coal; a front semi-block which supports said outer tube and which rests on said first base of said prismatic block; a first side plate which rests on said first side surface of said prismatic block and which supports in the extension of said first side bore a connector sleeve for the gaseous oxidizer; and a second side plate which rests on said second side surface of said prismatic block and which supports in the extension of said second lateral bore an electrode penetrating through the latter into said central bore.
  • said distribution block advantageously comprises tie rods which connect said front semi-block to said first front plate.
  • the inner tube is advantageously provided with a flange which is housed axially between said distribution block and said front semi-block and which is blocked there by the axial assembly of the distribution block and the front semi-block.
  • This flange constitutes a simple and effective solution for fixing the inner tube to the connection device and at the same time ensures the tightness of said blind bore around the inner tube.
  • the front semi-block is advantageously provided with a recess which widens from the mouth of the outer tube in the direction of the distribution block.
  • the surface which delimits said recess is preferably a curve which is defined by a conical section and which is tangent to the internal surface of the external tube.
  • the inner tube is then advantageously provided at its mouth in the distribution block with a sleeve having substantially the shape of a bottle neck which, after assembly of the lance, is arranged in said recess of the semi-block before so as to define an annular channel which almost opens tangentially in said annular duct of the lance body.
  • the inner tube is advantageously provided, at its outlet mouth, with a deflector designed so as to promote a radial burst of the jet of gaseous oxidizer at the exit from the lance.
  • This deflector comprises for example a helical element integrated in the injection mouth formed by the inner tube.
  • An object of the present invention is also to propose a preferred solution allowing the injection lance to be introduced in a simple and safe manner into the hot wind duct up to the level of the mouth of the nozzle in the crucible.
  • This solution consists in introducing the lance through a channel arranged in a double wall which defines the hot wind duct of a nozzle. This assembly of the lance ensures precise and reliable adjustment of the lance head in the hot wind duct, at the mouth of the nozzle in the blast furnace crucible.
  • a first lance 10 used for implementing the method according to the invention is described with the aid of FIGS. 1 to 4. It mainly consists of an oblong lance body 12 which is fixed with one of its ends to a connection device 14. The latter is used to connect the lance 10 to a supply circuit for pulverized coal suspended in an inert gas and a supply circuit for a gaseous oxidizer.
  • the oxidizing gas may for example be oxygen.
  • the lance body consists of a double conduit (20, 22) formed by an inner tube 16 and an outer tube 18.
  • the tube 16 which has a cross section smaller than the tube 18, is introduced axially into the latter so as to define an annular conduit 20 between the two tubes 16 and 18.
  • This annular conduit 20 is intended for the passage of pulverized coal, while the first tube 16 itself defines a cylindrical conduit 22 which is intended for the passage of the gaseous oxidant .
  • FIG 1A there is a front view of the lance body 12 in the direction of arrow 24 of Figure 1.
  • the lance body 12 defines at its free end 26 a double mouth.
  • the latter comprises an annular injection mouth 20 ′, to which said annular conduit 20 leads, and a circular injection mouth 22 ′, to which said cylindrical conduit ends 22.
  • the injection mouth 20 ′ for pulverized coal is more precisely arranged annularly around the injection mouth 22 'for the gaseous oxidant.
  • the tube 16 is provided with spacers 28, which provide radial spacing of the outer tube 18 relative to the inner tube 16. As these spacers are exposed to the flow of pulverized coal , they are preferably made of a hard material, not very sensitive to abrasion.
  • connection device 14 comprises a first connection sleeve 30 for the pulverized coal and a second connection 32 for the gaseous oxidizer.
  • the two fittings 30 and 32, as well as the lance body 12, are advantageously mounted on a distribution block 34 preferably composed of two semi-blocks 36 and 38, which are assembled in the extension of the axis of the body of lance 12 by screws. In FIG. 3 we see two bores 39 intended to receive these screws, which extend from the semi-block 36 into the semi-block 38.
  • the semi-block 36 comprises a solid cylindrical body 37, surrounded by an annular peripheral chamber 40, into which the second connecting sleeve 32 ends for the gaseous oxidizer.
  • the first connector sleeve 30 axially terminates through a base 42 in a cavity 43 of said cylindrical body 37.
  • said cylindrical body 37 On the side of the opposite base 44 said cylindrical body 37 has a cylindrical axial extension 46 of diameter substantially smaller than the solid cylindrical body 37 and which ends in a frustoconical part 48. At its base, the axial extension 46 is surrounded by a base 50, so that the base 44 of said cylindrical body 37 is reduced to a flat annular ring 44 surrounding the base 50.
  • a central blind bore 52 extends axially from the end of said frustoconical portion 48 as far as in said solid cylindrical body 37.
  • This central bore 52 has substantially the same internal diameter as the tube 16.
  • the first channels 54 which open into the annular surface defined by the base 50 around said axial extension 46.
  • these channels 54 are extended in said axial cavity 43, into which the sleeve 30 terminates.
  • the channels 54 are preferably arranged symmetrically around the blind bore 52. In the embodiment shown in the Figures, there are altogether four channels 54, spaced each time by 90 °.
  • Figure 3A shows an alternative embodiment of the mouth of the connecting sleeve 30 in the body 37.
  • the volume of the cavity 43 ' is significantly increased relative to the volume of the cavity 43.
  • the body 37 is provided with a deflection surface 45 made of a material very resistant to erosion by pulverized coal.
  • This deflection surface 45 can be part of an insert, be made of a filler material, or be obtained by an adequate surface treatment. It is preferably rounded in order to avoid catching of fibrous materials contained in the pulverized coal.
  • Figure 3 shows a longitudinal section through said connecting device 14 through a plane passing through two of the four channels 54.
  • Figure 4 shows, on the other hand, a longitudinal section through a plane making an angle of 45 ° with the cutting plane of the Figure 3.
  • the solid cylindrical body 37 is provided in this plane with two second channels 56 which extend from the central bore 52 towards the annular peripheral chamber 40 into which they open. Two more of these second channels are located in a plane making an angle of 90 ° with the cutting plane of Figure 4.
  • the semi-block 38 constitutes a cylindrical sleeve which bears with an annular base 60 on the annular base 44 of said semi-block 36.
  • a cylindrical bore 62 having an inside diameter equal to the outside diameter of the tube 18.
  • This bore 62 serves as a seat at the end 64 of the tube 18, which is integral with a flange 66.
  • the latter which is for example welded to the tube 18, can be fixed using screws on the sleeve 38 on the side of its base 61.
  • Figure 3 we see two of the bores 68 provided for these screws. It will be appreciated that the outer tube 18 can thus be very easily replaced, without dismantling the connection device 14 or the inner tube 16.
  • the outer tube 18 opens into a frustoconical bore 70 which extends axially, flaring, through said semi-block 38 to end at the center of the annular base 60.
  • the small base of this frustoconical bore 70 corresponds to the section passage of the tube 18, while the large base has a diameter which is equal to the diameter of a circumference in which all the mouths of the channels 54 are inscribed on the side of the base 50.
  • said frustoconical bore 70 of the semi-block 38 cooperates with said coaxial extension 46, 48 of the semi-block 36 to define an annular cavity 72.
  • the latter consequently surrounds the central bore 52 over a part of the length of the latter to extend axially said annular duct 20 in the direction of said mouths of the channels 54.
  • the free surface of the annular cross section of the annular cavity 72 decreases continuously in the direction of the mouth of said annular duct 20, to present a neck 74 just before penetration into said annular duct 20. In this way the distribution of carbon in the annular duct 20 is advantageously uniform.
  • the inner tube 16 is mounted with its end 80 axially in the frustoconical part 48 of the semi-block 36. This assembly of the inner tube 16 will be done, for example by brazing, before assembling the two semi-blocks 36 and 38.
  • a sleeve 76 has been provided at the level of the neck 74, that is to say at the place where the flow of pulverized coal comes into contact with the internal tube 16, a sleeve 76 has been provided.
  • the latter can be fixed by brazing at the frusto-conical part 48.
  • FIGs 7 and 8 show a second embodiment of a lance used for the implementation of the method according to the invention.
  • This lance 210 comprises a lance body 212 which is fixed with one of its ends to a connection device 214.
  • the lance body consists of a double conduit 220, 222, which is formed of an inner tube 216 and an outer tube 218.
  • the tube 216 which has a smaller section than the tube 218, is introduced axially into the latter so as to define an annular conduit 220 between the two tubes 216 and 218.
  • This annular conduit 220 is intended for the passage of pulverized coal, while the first tube 216 itself defines a cylindrical conduit 222, which is intended for the passage of gaseous oxidant.
  • a feature of the lance 210 shown in Figures 7 and 8 is that it is designed to apply between the two tubes 216 and 218 a potential difference.
  • the lance 210 is designed to create in the annular conduit 220 an electric field which makes it possible to charge the particles of coal which are charged, suspended in an inert gas, through the conduit annular 220.
  • the two tubes 216 and 218 are therefore made of a material which is a good conductor of electricity and are spaced apart by spacers 228 of a dielectric material, for example a ceramic material based on oxide. aluminum.
  • the outer surface of the inner tube 216 can also advantageously be provided with a dielectric coating, for example a ceramic coating based on aluminum oxide, which at the same time has good resistance to wear by pulverized coal.
  • connection device 214 for this purpose comprises a distribution block 236, into which the two connection sleeves 230 and 232 open, and a front semi-block, through which opens the lance body 212.
  • the two parts 236 and 238 are assembled axially between two front plates 246 and 248. The latter are connected by tie rods 280 and bear on axially opposite front surfaces and two parts 236 and 238.
  • the outer tube 218 is fixed to the semi-block 238, which is preferably made of an electrically conductive metal.
  • the assembly of the outer tube 218 and the semi-block 238 can be done by brazing or by a flange (not shown).
  • the semi-block 238 is provided with a recess 270 which widens from the mouth of the outer tube 218 in the direction of the distribution block 236 to define a mouth opposite the latter. It will be noted that the surface which delimits the recess 270 is preferably a surface of revolution which is tangent to the inner surface of the outer tube 218.
  • the inner tube 216 has, at its mouth in the distribution block 234, a slightly tapered end 282. On this tapered end is fitted a sleeve 254.
  • This sleeve 254 which is made of a hard material having good resistance to erosion by pulverized coal has substantially the shape of a bottle neck. It is arranged in the recess 270 so as to define an annular channel 272 which opens quasi-tangentially in said annular conduit 220 of the lance body 212. It will be noted that, by the cooperation of the surfaces delimiting the recess 270 and the sleeve 254, the annular channel 272 defines a passage section which decreases continuously in the direction of the flow of the pulverized coal.
  • the distribution block 236 is, in this embodiment, made of a dielectric material of high hardness. It is for example a prismatic block made of ceramic material, for example a ceramic material based on aluminum oxide. It has a rear face 242 which is supported through a seal 286 on the rear front plate 246. At the place where the sleeve 230 opens out through said front plate 246, this rear face 242 is provided with a cavity 243 which penetrates into the distribution semi-block 236. A front face 244 of the prismatic block 236 bears on the semi-block 238 around the mouth of the recess 270 by means of a gasket tightness 288.
  • a blind central bore 252 opens into the front face 244 of the prismatic block 236.
  • the diameter of this central bore 252 is slightly larger than the end 282 of the inner tube 216.
  • L the central bore 252 extends axially through the prismatic block 236 up to the level of a lateral bore 256, which opens into a lateral surface 255 of said block prismatic 236.
  • Around the central bore 252 are arranged two channels 254 which terminate, on one side, in the front cavity 243 and, on the other side, in said annular channel 272 defined in the semi-block 238.
  • the channels 254 are preferably symmetrical with respect to the central axis of the prismatic block 236.
  • the inner tube 216 opens with its end 282 into said central bore 252.
  • a flange 290 integral with this end 282 of the inner tube 216, bears by means of a seal 292 on a base 294 of the prismatic block 236 which surrounds the central bore 252.
  • the flange 290 therefore ensures a tight closure of the central bore 252 around the inner tube 216.
  • this flange 290 allows the fixing and centering of the inner tube 216 in the device connection 214. To this end, it preferably has a square shape and is housed in a corresponding cavity of the semi-block 238.
  • the inner tube 216 is blocked between these semi-blocks 236 and 238 via the flange 290.
  • the flange 290 is provided with passage orifices communicating these channels 254 with ec said annular channel 272. It will be noted that between the flange 290 and the semi-block 238 is disposed a dielectric material in order to avoid an electrical short circuit between the inner tube 216, which is integral with the flange 290, and the outer tube 218, which is integral with the semi-block 238.
  • the prismatic block 236 is disposed between two side plates 298 and 300.
  • the plate 298 is supported on the lateral surface 255 into which opens said second channel 256, while the plate 300 is supported on an opposite lateral surface of the prismatic block 236
  • In plate 298 is fitted the connector 232 for the gaseous oxidizer.
  • a seal 302 between the plate 298 and the block prismatic 236 seals between the connector 232 and said second channel 256.
  • the opposite plate 300 supports an electrical connector 304 for applying an electrical potential to the inner tube 216.
  • This electrical connector 304 comprises for example an insulating sleeve 306, which is mounted in a sealed manner in the plate 300 and an electrode 308 passing through, preferably in a sealed manner, the insulating sleeve 306 to penetrate through a channel 310 of the prismatic block 236 in said central bore 252.
  • the electrode 308 is supported with its front end on the inner tube 216.
  • the seal between the plate 300 and the prismatic block 236 is ensured by a seal 312.
  • a spring 314 is arranged between the electrode 308 and a cap 316 screwed onto the sleeve 306 so as to elastically maintain the contact between the tip of the electrode 308 and of the rear end 282 of the inner tube 216.
  • the electrode 308 is ra preferably connected to a positive terminal of a direct current source, while the external metal parts of the lance 210 (in particular the external tube 218, the semi-block before 238, the plates 298, 300, etc.) are connected to the negative terminal of this source.
  • a deflector 320 is integrated in the front end of the inner tube 216.
  • This deflector 320 which preferably has a helical shape, is intended to promote rapid bursting of the jet of oxidant gas at the outlet. of the inner tube 216.
  • FIG. 5 there is a hot wind nozzle 100 which is mounted in a manner known per se, using a tympe 112, in a wall 104 of a blast furnace.
  • This nozzle opens into the upper part of a blast furnace crucible 106. It constitutes the last conduit of a set of conduits arranged around the blast furnace to blow the hot wind into the crucible 106.
  • On the nozzle 100 is supported a conduit 108, called busillon.
  • the bearing surface between the nozzle and the nozzle forms a spherical articulation 110 which allows a relative angular displacement of the two conduits 100 and 108 to allow relative angular deformations of thermal origin.
  • the reference 112 generally designates a mounting device for a lance of the type described above. This device 112 makes it possible, in accordance with the method according to the present invention, to introduce the end 26 of this lance 10 into the nozzle 100, so that the injection ports of pulverized coal 20 ′ and of gaseous oxidant 22 'are located at the mouth of the nozzle 100 in the crucible 106.
  • FIG 5 is shown schematically, in broken lines, the template of the lance, when the latter is mounted in the mounting device 112.
  • This mounting device allows to introduce the lance body 12 between the tympe 102 and the nozzle 108, directly through a wall 114 of the nozzle 100, up to the level of the mouth of the nozzle 100 in the crucible 106.
  • the nozzle 100 is a nozzle of new design which is described using Figure 6.
  • the nozzle 100 consists of a double wall 114 which forms, in a manner known per se, a frustoconical body axially defining a cylindrical hot-air duct 116.
  • the wall 114 forms an annular surface 118. The latter is limited around the mouth of the duct 116 by an annular recess serving as a bearing surface for the nozzle 108.
  • the wall 114 defines the mouth 121 of the duct 116 for injecting the hot wind into the crucible 106.
  • the double wall 114 defines interior cavities 122 which are connected to a cooling circuit.
  • the reference 124 designates a connection for the admission of a cooling fluid.
  • the nozzle 100 is distinguished from a nozzle according to the prior art, by a straight channel 126 integrated in said double wall 114 of the nozzle and opening on one side into the surface 118 at the upstream end of the nozzle, and on the other side in the hot wind duct 116, so that the extension of the axis of the channel 126 towards the mouth 121 of the nozzle does not meet the wall 114 of the latter.
  • This channel serves as a sheath for introducing the upstream end of the lance body 12 into the nozzle 100; it therefore has a slightly larger passage section than the cross section of the front end of the lance body 12.
  • this channel 126 is advantageously extended by a cylindrical sheath 130.
  • the latter extends in an annular free space 132 available between the tympe 102 and the nozzle 108. It is preferably screwed with one of its ends in said channel 126, which is provided with a thread 134 on the side of its mouth in said annular surface 118.
  • this sheath 130 is extended axially by a non-return valve 136, a ball valve 138 and a gland connection 140.
  • the cantilever length of the lance body which is subjected to the flow of the hot wind is reduced to a minimum, and that the position of the end 26 of the lance 10 in the hot wind duct 116 is no longer affected by a relative displacement of the nozzle 108 and the nozzle 100.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
  • Nozzles (AREA)
  • Manufacture Of Iron (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP93109093A 1992-07-01 1993-06-07 Vorrichtung zum Einblasen von Kohlenstaub in einen Hochofen Expired - Lifetime EP0576869B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
LU88139 1992-07-01
LU88139A LU88139A1 (fr) 1992-07-01 1992-07-01 Procédé et dispositif pour l'injection de charbon pulvérisé dans un creuset de haut fourneau
LU88249 1993-04-21
LU88249A LU88249A7 (fr) 1992-07-01 1993-04-21 Procédé et dispositif pour l'injection de charbon pulvérisé dans un creuset de haut fourneau

Publications (3)

Publication Number Publication Date
EP0576869A2 true EP0576869A2 (de) 1994-01-05
EP0576869A3 EP0576869A3 (de) 1994-03-09
EP0576869B1 EP0576869B1 (de) 1998-11-11

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EP (1) EP0576869B1 (de)
JP (1) JPH0688107A (de)
CN (1) CN1037527C (de)
BR (1) BR9302315A (de)
CA (1) CA2098514A1 (de)
DE (1) DE69322002T2 (de)
ES (1) ES2123018T3 (de)
RU (1) RU2103375C1 (de)

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US6090182A (en) * 1997-10-29 2000-07-18 Praxair Technology, Inc. Hot oxygen blast furnace injection system
US6206949B1 (en) 1997-10-29 2001-03-27 Praxair Technology, Inc. NOx reduction using coal based reburning
US7914279B2 (en) 2003-01-21 2011-03-29 American Air Liquide, Inc. Method and apparatus for injecting a gas into a two-phase stream
EP2796566B1 (de) 2011-12-21 2018-08-29 JFE Steel Corporation Betriebsverfahren für einen verbrennungsofen

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AU722145B2 (en) * 1995-10-02 2000-07-20 Jfe Steel Corporation The production of hot metal by the melting down of scrap as an iron source.
LU90150B1 (de) * 1997-10-15 1999-04-16 Kuettner Gmbh & Co Kg Dr Verfahren un Vorrichtung zum Einblasen von Reduktionsmittel in einen Schachtofen
EP0992753A3 (de) * 1998-08-04 2001-08-08 Linde Gas Aktiengesellschaft Verfahren zum Betreiben eines Schachtofens und Schachtofen
US6618453B1 (en) * 1999-08-20 2003-09-09 Qualcomm Inc. Estimating interference in a communication system
KR100711435B1 (ko) * 2001-04-09 2007-04-24 주식회사 포스코 미분탄 취입랜스
US20060157899A1 (en) * 2005-01-15 2006-07-20 Lew Holdings, Llc Single vessel blast furnace and steel making/gasifying apparatus and process
KR100803990B1 (ko) * 2006-10-18 2008-02-15 주식회사 포스코 용융가스화로의 취입풍구
LU91445B1 (en) * 2008-05-23 2009-11-24 Wurth Paul Sa Method for feeding pulverised coal into a blast furnace
LU91462B1 (en) * 2008-07-14 2010-01-15 Wurth Paul Sa Insertion and extraction of fuel injection lances into and out of the tuyere stock of a blast furnace
LU91543B1 (en) * 2009-03-24 2010-09-27 Wurth Paul Sa Tuyere stock arrangement for a blast furnace and method for operating a blast furnace
JP5824811B2 (ja) * 2010-01-19 2015-12-02 Ｊｆｅスチール株式会社 高炉操業方法
LU91691B1 (en) * 2010-05-26 2011-11-28 Wurth Paul Sa Tuyere stock arrangement of a blast furnace
JP5263430B2 (ja) * 2011-07-15 2013-08-14 Ｊｆｅスチール株式会社 高炉操業方法
US8919670B2 (en) * 2011-12-09 2014-12-30 United States Steel Corporation Injection lance with variable swirl
CN103672866B (zh) * 2013-11-25 2016-04-06 中国科学院过程工程研究所 一种炼铁工艺用喷吹煤粉预热燃烧装置及方法
TR201819990T4 (tr) 2014-06-27 2019-01-21 Tuerkiye Bilimsel Ve Teknolojik Arastirma Kurumu Tuebitak Bi̇r kömür besleme si̇stemi̇.
CN104456548A (zh) * 2014-11-12 2015-03-25 宁夏嘉翔自控技术有限公司 一种金属镁还原炉的煤粉燃烧器的接管组
CN104878216A (zh) * 2015-05-21 2015-09-02 金隆铜业有限公司 一种铜冶炼渣贫化方法以及系统
JP6347896B2 (ja) * 2015-12-25 2018-06-27 株式会社トライテック 燃料供給装置
AU2017240929B2 (en) * 2016-04-01 2020-06-04 China Enfi Engineering Corporation Blowtorch for use in lateral blowing of submerged burning molten pool metallurgical furnace and metallurgical furnace having blowtorch
EP3556871A4 (de) * 2016-12-15 2020-08-26 Trytec Co., Ltd. Kraftstoffzufuhrsystem
CN107934559B (zh) * 2017-11-21 2019-07-30 青岛冠铭包装制品有限公司 一种流速可控轻质物料送料装置
RU2736444C2 (ru) * 2018-03-20 2020-11-17 Тритек Ко., Лтд. Устройство подачи топлива

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US3626501A (en) * 1968-03-18 1971-12-07 Atlantic Richfield Co Apparatus for injecting fluid fuel into a blast furnace
FR2131868A1 (en) * 1971-03-31 1972-11-17 Nippon Kokan Kk Blast furnace combustion
EP0390766A1 (de) * 1989-03-28 1990-10-03 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren zum Injizieren eines Zusatzbrennstoffs in einen Hochofen
WO1991014791A1 (de) * 1990-03-20 1991-10-03 Küttner Gmbh & Co. Kg Verfahren und vorrichtung zum einblasen von kohlenstaub und sauerstoff in einen hochofen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6090182A (en) * 1997-10-29 2000-07-18 Praxair Technology, Inc. Hot oxygen blast furnace injection system
US6206949B1 (en) 1997-10-29 2001-03-27 Praxair Technology, Inc. NOx reduction using coal based reburning
US7914279B2 (en) 2003-01-21 2011-03-29 American Air Liquide, Inc. Method and apparatus for injecting a gas into a two-phase stream
EP2796566B1 (de) 2011-12-21 2018-08-29 JFE Steel Corporation Betriebsverfahren für einen verbrennungsofen

Also Published As

Publication number Publication date
RU2103375C1 (ru) 1998-01-27
JPH0688107A (ja) 1994-03-29
CN1037527C (zh) 1998-02-25
ES2123018T3 (es) 1999-01-01
BR9302315A (pt) 1994-01-25
US5451034A (en) 1995-09-19
CA2098514A1 (en) 1994-01-02
DE69322002D1 (de) 1998-12-17
CN1080960A (zh) 1994-01-19
EP0576869B1 (de) 1998-11-11
EP0576869A3 (de) 1994-03-09
DE69322002T2 (de) 1999-04-01

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