Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B7/00—Blast furnaces
  • C21B7/14—Discharging devices, e.g. for slag
• • 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
  • F27D3/00—Charging; Discharging; Manipulation of charge
  • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
  • F27D3/1509—Tapping equipment
• • 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
  • F27D3/00—Charging; Discharging; Manipulation of charge
  • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
  • F27D3/1509—Tapping equipment
  • F27D3/1527—Taphole forming equipment, e.g. boring machines, piercing tools
• • 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
  • F27D3/00—Charging; Discharging; Manipulation of charge
  • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
  • F27D3/1509—Tapping equipment
  • F27D3/1536—Devices for plugging tap holes, e.g. plugs stoppers

Definitions

• the invention relates to a method and melt channels for interrupting and restoring the melt stream of iron and metal melts in taphole channels of blast furnaces and outflow channels of smelting furnaces.
• melts from metallurgical vessels such as blast furnaces and smelting furnaces as well as similar devices occurs in most cases over certain periods of time. Thereafter, the melt stream is interrupted and re-initiated at a later time.
• devices such as gate valves and shutters for interrupting melt streams.
• blast furnaces almost exclusively the stuffing method is used at the tap holes, in which a plastic mass developed especially for this purpose is pressed into the tap hole channel at high pressure. The stuffing mass cures in the taphole channel and must be drilled for a new tapping operation. For this complex technical facilities are necessary.
• DE 34 43 143 Al describes a method for alternately opening and closing a stitch hole in ovens, in which the taphole channel is first closed by a shut-off. Subsequently, a stuffing gun at the Opening the taphole channel attached, and immediately after reopening the obturator, the taphole channel is filled by the stuffing cannon completely with stuffing. After filling the Stichlochkanals, but before the complete curing of the stuffing a tapping is driven centrally by means of a drill through the stuffing mass into the oven, and the next tapping the tapping rod is pulled out of the taphole channel again.
• the invention has for its object to provide a method and melt channels, especially Stichlochkanale for blast furnace and drainage channels for melting furnace, to develop the disadvantages of known methods, in particular the Stichlochstopfvons blast furnace, - and corresponding facilities for interrupting and restoring a Schmelzest roms m a Avoid melt channel.
• the method according to the invention for interrupting and restoring the melt stream of iron and metal melts in channels is characterized by a transfer of the melt stream in the channels by cooling in the solidification state to interrupt the melt stream and melting the solidified Melting and a restoration of the melt stream by heating, especially for a re-tapping process in blast furnace.
• a further possibility for accelerating the solidification process of the melt is that the melt stream is passed before solidification m the flow channel, in particular the taphole channel, by at least one magnetic field with constant polarity or by at least one alternating magnetic field, such that m the melt stream, a voltage is induced, are generated by the eddy currents in the melt stream, whereby forces are generated by the interaction of magnetic field and eddy currents, which are opposite to the direction of flow of the melt stream and through which
• a solidified melt layer on the inner wall of the channels to protect the same against abrasion through the further flowing in the central region melt stream can be formed.
• the flow velocity in the outer flow region of the melt stream can be decelerated to accelerate the solidification process of the melt by a corresponding shaping of the inner wall of the taphole or drain channel.
• Fig. 1 is a longitudinal sectional view of a formed by an outer tube and an inner tube taphole of a blast furnace with a cooling device and a heater and a device for controlling and braking the flow velocity of the flowing through the taphole channel melt stream, the
• FIGS. 2a a pivoting flap for shutting off the and 2b outlet opening of the needle hole channel in the open and in the closed position
• Fig. 3 is a longitudinal sectional view of another
• Fig. 4 is a fragmentary longitudinal sectional view of a third embodiment of a taphole channel with a cooling coil, which is combined with an electric heating coil.
• the tap hole channel 2 of a blast furnace 1 shown in Figure 1 is axially through an outer tube 3 and in this displaceable inner tube 4 is formed, wherein the outer tube 3 is fixedly connected to the lining 5 of the blast furnace 1.
• Both tubes 3, 4 are made of a high-strength, preferably ceramic material and the material of the inner tube 4, which serves to stop the Abrasionsverschl admiration by the outflowing pig iron and the effluent slag, is also resistant to abrasion.
• the inner tube 4 consists of pipe sections 6, which are replaced to compensate for the Abrasionsverschl foundedes occurring at certain time intervals by new pipe sections 6a, the new mecanicrohrabschnxtte 6a inserted through the Auslaufo réelle 7 of the taphole 2 against the flow direction a of the melt stream 8 in the outer tube 3 and thereby simultaneously worn pipe sections 6b through the Emlaufo réelle 9 of the taphole channel 2 from the outer tube 3 out of the blast furnace 1 m pushed.
• the inner tube section 6b through which the melt stream 8 m enters the taphole channel 2 of the blast furnace 1, protrudes by a certain amount to protect the outer tube 3 and the outer wall 5 of the blast furnace 1 against Abrasionsverschl redesign in the blast furnace.
• This inner pipe section 6b assumes the function of the so-called mushroom on the inside of the lining of a blast furnace in the conventional tapping process.
• the time interval of insertion of new pipe sections 6a is chosen so that destruction of the inner pipe sections 6 is avoided and thereby contact of the slag with the outer pipe 3 is excluded.
• a mineral-based lubricant 10 Between the outer tube 3 and the inner tube sections 6 is a mineral-based lubricant 10, which unfolds its full lubricity at the high temperatures of the outflowing iron and the effluent slag and the penetration of the melt m the gap between the inner pipe sections 6 with subsequent solidification and an associated bonding of the inner pipe sections 6 with the outer tube 3 prevented.
• the taphole channel 2 is equipped with a cooling device in the form of rohrformigen Kuhlsch GmbH 11 which enclose the outer tube 3 in the adjoining the Auslaufo réelle 7 of the Stichlochkanals 2 channel section, since after a tapping on the blast furnace 1 by the solidification of the melt ⁇ by the the Kuhlsch GmbH 11 flowing coolant is effected in the outlet region of the needle hole channel 2, a sufficiently strong sealing plug 12 is formed.
• a heating device in the form of an electric heating coil 13, which surrounds the taphole channel 2, serves to melt the solidified sealing stopper 12 in the section of the taphole channel 2 adjoining the outlet opening 7 for a renewed inking process.
• the melt will either solidify and / or remain liquid in the back furnace side section of the taphole because the times between tapping operations - especially if there are irregularities in the operations - may vary. Therefore, the heaters for re-melting the solidified melt material must be effective over the entire length of the taphole channel.
• electrical induction coils can be used, which via magnetic fields eddy currents m the solidified melt for heating and melting of the same produce.
• the winding of the induction coils is formed as a hollow profile, which forms a flow channel for a coolant to avoid damage to the coil winding as a result of overheating by the flowing electric current and the waste heat of the blast furnace.
• a shut-off device designed as a pivoting flap 14 or slide is arranged for closing the outlet opening of the channel prior to the solidification of the melt during the cooling process.
• the pivoting flap 14 shown in FIGS. 2 a and 2 b is pivotable about an axis 15 and is held in the closed position of stops 16 pivoted in front of the taphole channel 2.
• the stops 16 ensure that the forces resulting from the internal pressure of the blast furnace can be absorbed by the pivoting flap 14. As the melt in the taphole channel of the blast furnace solidifies, the forces acting on the pivoting flap decrease.
• the pivoting flap 14 is covered on its side facing the taphole channel 2 with a thick layer of refractory material, so that the flap does not suffer any damage due to contact with the extremely hot melt even after prolonged use.
• the cooling of the melt in the taphole channel 2 can be carried out with little cooling effort and therefore with less energy consumption.
• the induction coils for melting the melt plug 12 solidified in the taphole channel 2 by eddy currents for a new tapping process are designed such that the melting of the melt plug 12 takes place in its surface area 17 adjoining the inner wall of the inner tube 4. Under the internal pressure of the blast furnace 1, the latter is subjected to this Way reduced in diameter closure plug 12 with open pivoting flap 14 from the taphole channel 2, wherein the melted melt material acts as a lubricant.
• a device 18 for controlling the flow rate and for braking the non-ferromagnetic melt stream 8 is arranged with a core 19 of ferromagnetic material in the adjoining the outlet opening 7 of the stitch hole channel 2 channel portion 18 having two poles 20, 21, the order the Stichlochkanal 2 of the blast furnace 1 are arranged opposite one another, and with mounted on the core 19 induction coils 22, 23 for generating a magnetic field, which induces a voltage in the melt stream 8, by the m the melt stream eddy currents are generated by interaction with the magnetic field Generate forces that are opposite to the direction of flow a of the melt stream 8 and by the melt flow can be braked to a complete standstill.
• the tap hole channel 24 shown m Figure 3 is formed by an outer tube 3 and an inner tube 4, which consists of pipe sections 6, the inner walls 25 as groynes 26th are formed, such that a series arrangement of groynes 26 results, whose openings 27 in the flow direction a of the melt stream 8 rejuvenate.
• the series arrangement of the groynes 26 causes the flow velocity of the melt stream 8 is greatly slowed down on the inner walls 25 of the inner pipe sections 6 with respect to the flow rate of the central melt stream.
• the taphole channel 30 shown in detail in Figure 4 is equipped with a combined cooling and heating coil 31, the winding 32 as a hollow section 33 of an electrically conductive material, in particular copper, wherein a Kuhlstoff, by the flow channel formed by the hollow section 33 34th flows, a solidification of the melt stream 8 in the taphole 30 of a blast furnace 1 or in the drainage channel of a melting furnace causes and to initiate a re-tapping on the blast furnace 1 connected to a high-frequency alternating current with high current strong cooling and heating coil 31 at a throttled Kuhlstofftechnik matfl ⁇ ss to avoid overheating of the coil winding 32 generates large eddy currents 35 in the solidified melt in the taphole channel 30 for melting the melt.
• a Kuhlstoff by the flow channel formed by the hollow section 33 34th flows
• a solidification of the melt stream 8 in the taphole 30 of a blast furnace 1 or in the drainage channel of a melting furnace causes and to initiate a re-tapping on the blast furnace
• the eddy currents are increasingly formed with increasing frequency by the skin effect in the adjacent to the inner wall of the needle hole channel, solidified, outer layer of melt and lead to a local heating. If the supplied current strength m of the coil is sufficiently high, the eddy currents will also have correspondingly high current strengths, so that they have sufficient energy to liquefy the outer melt layer. In this state, the Kuhlstoff matficient is dimensioned by the coil winding such that there is no undesirable cooling of the melt, but overheating of the winding is prevented despite very high current strengths.
• the skin effect will be such that the electric current will flow at high frequencies substantially in the outer layers of the material of the coil, so that the coolant in the flow passage of the coil on the function of the induction coil to produce eddy currents, no will have a negative influence.
• the combined cooling and heating coil system 31 is assemble from a plurality of sub-coils placed side by side. As a result, a better adaptation to the different conditions and requirements along the tap hole channel 30 can be achieved. It also improves the cooling effect and reduces the inductance of the parts of the coil, so that it can be operated at a higher frequency with the advantages listed above. With regard to optimum efficiency, the combined cooling and heating coil is integrated in an electrical LC resonant circuit, which is controlled by a corresponding controller and operated at the resonance point.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Metallurgy (AREA)
• Materials Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Organic Chemistry (AREA)
• Blast Furnaces (AREA)
• Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
• Gasification And Melting Of Waste (AREA)
• Processing Of Solid Wastes (AREA)
• Vertical, Hearth, Or Arc Furnaces (AREA)
• Furnace Details (AREA)
• Furnace Charging Or Discharging (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2008
  • 2008-08-07 DE DE102008036791A patent/DE102008036791A1/de not_active Ceased
• 2009
  • 2009-08-06 US US13/057,909 patent/US20110174804A1/en not_active Abandoned
  • 2009-08-06 EP EP09781568A patent/EP2310540A2/de not_active Withdrawn
  • 2009-08-06 WO PCT/EP2009/060221 patent/WO2010015682A2/de active Application Filing
  • 2009-08-06 RU RU2011106576/02A patent/RU2011106576A/ru not_active Application Discontinuation
  • 2009-08-06 BR BRPI0917124A patent/BRPI0917124A2/pt not_active IP Right Cessation
  • 2009-08-06 CN CN2009801399425A patent/CN102177260A/zh active Pending
  • 2009-08-06 JP JP2011521584A patent/JP2011530010A/ja active Pending

Non-Patent Citations (1)

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