EP3859257A1 - Bouchons de fermeture pour trous de coulée de convertisseur - Google Patents

Bouchons de fermeture pour trous de coulée de convertisseur Download PDF

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Publication number
EP3859257A1
EP3859257A1 EP21153763.4A EP21153763A EP3859257A1 EP 3859257 A1 EP3859257 A1 EP 3859257A1 EP 21153763 A EP21153763 A EP 21153763A EP 3859257 A1 EP3859257 A1 EP 3859257A1
Authority
EP
European Patent Office
Prior art keywords
sealing plug
tapping hole
plug according
plug body
retaining claws
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
EP21153763.4A
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German (de)
English (en)
Other versions
EP3859257B1 (fr
Inventor
Veronica Stilkerieg
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Individual
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Individual
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Publication of EP3859257A1 publication Critical patent/EP3859257A1/fr
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Publication of EP3859257B1 publication Critical patent/EP3859257B1/fr
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Classifications

    • 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
    • C21C5/4653—Tapholes; Opening or plugging thereof
    • 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 sealing plug for temporarily closing the tapping hole of a tiltable converter, consisting of a cylindrical, deformable plug body made from a quantity of clay, light bodies made of easily meltable hydrocarbon compounds, plasticizers and celluloses, and oil as a molding aid, a base plate delimiting the plug body at the bottom, and a plug body at the top limiting end plate and a pipe connecting the two plates, wherein the plug body can be inserted into the tap hole via an applicator and can be fixed therein and can be flushed out of the tap hole again via the liquid steel.
  • pig iron is first produced from iron ore with the help of coke and lime. After tapping, the pig iron is fed into torpedo pans for further processing. The pig iron, which has been processed in the meantime, is then made into steel in the converter by blowing it with oxygen, whereby additives such as scrap and alloy materials are generally used.
  • These tiltable converters have an outlet opening or a tap hole for transferring the liquid steel into the tapping pan at a suitable point in the converter wall above the steel bath level. For emptying, the converter is tilted into such a position that the steel flows through the tap hole into the ladle downstream.
  • the sealing plug is pushed so far into the converter tapping channel that its face plate is positioned almost flush with the inside of the converter and is then set by pulling the claw.
  • the front plate merges into a funnel channel that penetrates the sealing plug so that the plug is actually set on the inside of the converter and not on its outer wall. If the sealing plug is set accordingly, the face plate sintered and neither slag nor other parts can flow out through the tap hole, rather only the pure liquid steel.
  • the face plate and also the funnel channel or the pipe that defines it are partially melted, with the steel being able to flow in a targeted manner into the tapping pan below.
  • Such a stopper consists of refractory material, light bodies made of easily meltable hydrocarbon compounds, plasticizers, celluloses and oil.
  • the object of the invention is therefore to create a sealing plug which, due to its material composition, can be easily deformed and which can be inserted into the tapping hole and deformed there without the setting device described.
  • the plug body is designed to be easily deformable as a soft mass and that retaining claws are assigned to it, which fix in the tapping hole when the plug body is inserted and enable the plug body to be deformed between the base plate and the face plate with the help of the rod-shaped applicator are executed.
  • the plug body is specifically reduced in weight by the lightweight bodies used and, by using special lightweight bodies or additional lightweight bodies with a rod-shaped applicator, is pushed into the tap hole and then fixed and deformed there by simply pushing it further, because the retaining claws get stuck and either the front plate or the base plate are connected to the pipe, it is possible to move the two plates against each other.
  • the retaining claws attach themselves to the tapping hole, so that the plug body, which is already in the tapping hole, can no longer be moved, but rather is forcibly deformed.
  • the retaining claws are fixed on the face plate and that the base plate is designed to be displaceable on the tube via the rod-shaped applicator. This ensures that the end plate can no longer be moved further into the tapping hole after the retaining claws have been fixed, but rather that the base plate located or arranged on the outside of the converter is now moved further into the tapping hole, whereby it ensures that the plug body is deformed and stuck in the tapping hole.
  • a further advantageous embodiment provides that the retaining claws are fixed on the face plate and the base plate is connected to the tube and both can be displaced in the direction of the face plate via the rod-shaped applicator. This means that not only the base plate is shifted in the direction of the face plate, but also the tube, which is then moved by the face plate fixed by the retaining claws is pushed through and thus protrudes a short distance into the tapping channel. This also ensures that the primary slag does not flow off through the pipe and that any slag that escapes during the blowing process can also close it depending on its composition, but rather only and safely the liquid steel, which then, as already mentioned, both plug components dissolves, but in any case prevents the slag from flowing into the tapping pan.
  • an expedient embodiment provides that the tube can be displaced over the applicator by 5-15 cm, preferably 10 cm over the face plate in the direction of the interior of the converter. This is a great advantage, since the pipe can no longer become clogged with slag spurting out during the blowing process, leading to the disadvantages described above with clogging.
  • a connection for example welding the retaining claws to the face plate
  • two retaining claws connected to one another are placed on the top of the tube, encompassing the displaceable face plate. If the front plate is now shifted, the retaining claws ensure that this is not possible if the retaining claws have stuck to the tapping hole or in the tapping hole.
  • Such a fixing of the retaining claws is ensured if they are made of 6 mm reinforcing iron and bent to form a hook at the lower, free end and have an outer dimension of + 30 - 50 mm, preferably 40 mm larger plug circumference and 3 - 10 cm larger length than the plug body are formed having. Due to these dimensions, it is first of all ensured that the upper end, which is either pinned to the face plate or rests on it, can lie tightly against the plug body, i.e. in any case cannot hinder the process of being pushed into the tapping hole. If the main body is then inserted far enough into the tapping hole, the lower free ends are fixed with the hook around the tapping hole or around the cold outer edge, so that the deformation process can then start safely. All of this is done with the simple rod or the applicator, so that skill can no longer play a decisive role here.
  • the plug body consists of the soft mass mentioned in claim 1, in particular the mineral oil used and the light body, whereby according to a further development it is provided, in addition to these light bodies made of easily meltable hydrocarbon compounds, to achieve a low overall weight and good manageability, additional light bodies in the form of mineral ones Expanded glass existing hollow glass spheres are mixed into the plug body.
  • the plug body which has these different light bodies or additional light bodies, is not only characterized by a low overall weight, but also by the fact that it can be optimally handled and can thus be easily inserted into the tapping hole.
  • the mineral oil contained has an optimal shaping effect, as provided in a second further advantageous embodiment of the invention.
  • such a sealing plug has a plug body made of a mixture of 10 - 50% by volume polystyrene granulate 10 'from 0.3 - 5 mm, 5 - 30% by volume additional light body in the form of expanded glass from 0.2 - 8 mm, 20 - 45 wt .-% additional light body in the form of aluminum hollow spherical silicate with 0.1 - 1.5 mm diameter and 15 - 70% by weight of clay from kaolinite, bentonite and clay 3-layer silicate, 0.5-3% by weight plasticizer 0.1 - 2% by weight liquefier 0.1-2% by weight temporary binders 0.1-5% by weight permanent binders and 2 - 8% by volume of oils as molding aids.
  • hollow glass spheres are basically from the EP 2 315 859 B1 known, but not in the material composition specified here and also not together with polystyrene granulate of 0.3 - 5 mm, which only in this composition brings the desired optimal weight reduction and thus optimal ease of use and also together with the particular clay and Bentonite gives the mass the necessary softness.
  • the sealing plug with the polystyrene granulate mentioned, but in the form of 2-3 mm, while the expanded glass in the form of 0.2-0.5 mm and the hollow aluminum spherical silicate in the Form 0.1-0.5 mm is introduced into the total mixture.
  • the polystyrene should not have a spherical shape. This shape gives the polystyrene a modified structure, which together with the expanded glass gives the stopper a high level of stability.
  • the specifically shaped polystyrene gives the mass or the mixture a much better hold than the previously used styrofoam balls, because the new shape (coffee bean shape) creates a matrix similar to that of a concrete mixture. In this way, the desired stability can be safely achieved and maintained.
  • the polystyrene granulate should also be a graphitized polystyrene, this graphitized styrofoam ensuring that all components of the plug body are optimally mixed and adhered.
  • a sealing plug ensures quick installation, ensures that pre-run slag is always held back, even while the converter is tilting, sits securely in the tapping hole, does not sinter and ensures that the channel is completely free within 5 to 10 seconds at the moment of tapping so that the steel can drain away.
  • the stopper is easy to store and has a low weight, which in particular makes it easier to insert it into the tapping hole of the converter.
  • the sealing plug according to the invention ensures a sufficiently high steel bath above the stopper by briefly holding back the steel so that tap vortices can be reliably prevented.
  • These disadvantageous eddies arise with bath heights of less than 2.5 times the tapping diameter, i.e. with a tapping of 160 mm below a height of 400 mm. If there is no stopper, vortices are created that move in the bath up to the surface and pull converter slag into the template or the tapping pan during the tapping process.
  • Figure 1 shows a converter 2 in section, whereby it can be seen that the flowing liquid steel 5 carries a layer of slag 6.
  • the liquid steel 5 flows through the tapping hole 4 into the tapping pan 3, which is already partially filled with liquid steel 5 '.
  • the sealing plug 1 is in here Figure 1 not shown and not recognizable because it has already been flushed out of the tap hole 4 again by the liquid steel.
  • the inside of the converter is denoted by 18 and the cold edge of the tapping hole 4 is denoted by 24.
  • FIG. 2 actually shows the state of the art, in which the plug 1 with its entire plug body 8 is inserted into the tap hole 4 in order to then be deformed via the setting device 22, for which purpose the base plate 11 and face plate 12 are moved against each other with the setting device 22, 22 ' become.
  • the wall of the plug body 8 is pressed against the inner wall of the tapping hole 4 and the tapping hole 4 is thus effectively closed.
  • liquid steel can then flow through the pipe 13 to, as in FIG Figure 1 shown to be distributed in the tapping pan 3.
  • Figure 3 shows an embodiment of the sealing plug 1 with the plug body 8, which is covered by the end plate 12 at the end to be inserted first into the tapping hole 4.
  • This face plate 12 is connected with 4 retaining claws 15, 16, 20, 21, these retaining claws 15, 16, 20, 21 with their hooks 26, 26 'ensure that the plug body 8 is attached to the tapping hole 4 after it has been inserted the inner wall 7 or on the cold edge of the tapping hole 24 is fixed.
  • the base plate 11 cannot be seen at the bottom, but the protruding tube 13, which connects the base plate 11 and the face plate 12, does.
  • Figure 4 shows an embodiment in which only two retaining claws 15, 16 are used, which have hooks 26, 26 'at the lower end, ie at the free end 25.
  • the retaining claws 15, 16 are firmly fixed on the upper end plate 12, while the displaceable mass 30 with the lower loose base plate 11 can be moved against the upper end plate 12 firmly connected to the pipe 13, so that the outer wall 27 of the plug body 8 fits tightly the inner wall 7 of the tap hole 4 can create.
  • the plug body 8 has, in addition to the amount of clay, polystyrene granules
  • the sealing plug after Figure 5 is characterized in that the two retaining claws 15, 16 are looped around the tube 13 above the end plate 12 and connected to one another, so that a fixation, i.e. connection to the end plate 12, can be dispensed with.
  • the tube 13 here has an overhang 14, which is created by the fact that the tube is pushed through the end plate 12 in order to reach the overhang 14 already mentioned above, whereby this can take place when the plug body 8 is deformed.
  • slag 6 cannot flow off through pipe 13 and close it, since pipe 13 protrudes about 10 cm at the top towards the hot side and no slag 6 then builds up in pipe 13. Otherwise, if the pipe 13 did not protrude, this would occur during the blowing process easily clog with slag spurting out, which would then cause problems later when the liquid steel 5 tips out or runs out.
  • Figure 6 again shows an embodiment in which the spreaders 15, 16 are connected to the face plate 12, the tube 13 being displaced together with the base plate 11 in the direction of the face plate in order to fix the plug body 8 in the tapping hole 4.
  • the plug body in addition to the amount of clay 9 and the light bodies 10, 10 ', also has additional light bodies 28, 28', 28 "which are introduced into the mixture.
  • the lightweight polystyrene granules are made of graphitized polystyrene and have the coffee bean shape mentioned.
  • a rod-shaped applicator 17 is shown, with which the stopper body 8 can be inserted into the tapping hole 4. Since the plug body 8 is equipped with the retaining claws 15, 16 shown in both figures, which have hooks 26, the plug body 8 settles when it reaches the position of Figure 7 or. Figure 8 fixed in the tapping hole 4, in which case either the base plate 11 is moved in the direction of the face plate 12 or the face plate 12 is moved in the direction of the base plate 11.
  • the protrusion 14 is again at Figure 8 recognizable and an auxiliary unit, actually not to be referred to as a setting device 22, but rather the already mentioned rod-shaped applicator 17.
  • Figure 9 shows the multiple mentioned light bodies 10, 10 ', 10 ", whereby the coffee bean shape is to be particularly emphasized here.
  • these light bodies 10 are characterized by their black color, which is the result of the graphitization. It can be seen that the surface of these Light body 10 is not completely flat, but rather shows notches, edges and the like, which facilitate the fixation on the amount of clay 9.
  • the tap hole 4 is shown with its two edges.
  • the warm edge 23 can be seen on the inside, that is to say on the liquid steel 5, while the cold edge already mentioned above is denoted by 24.
  • the enclosure of the ends of the retaining claws 15, 16 is identified by the reference numeral 19.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Cosmetics (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
EP21153763.4A 2020-01-29 2021-01-27 Bouchons de fermeture pour trous de coulée de convertisseur Active EP3859257B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020102105.4A DE102020102105A1 (de) 2020-01-29 2020-01-29 Verschlussstopfen für Konverterabstichlöcher

Publications (2)

Publication Number Publication Date
EP3859257A1 true EP3859257A1 (fr) 2021-08-04
EP3859257B1 EP3859257B1 (fr) 2022-10-19

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ID=74346801

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21153763.4A Active EP3859257B1 (fr) 2020-01-29 2021-01-27 Bouchons de fermeture pour trous de coulée de convertisseur

Country Status (4)

Country Link
EP (1) EP3859257B1 (fr)
DE (1) DE102020102105A1 (fr)
EA (1) EA038416B1 (fr)
UA (1) UA125972C2 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315311A1 (fr) * 1987-10-16 1989-05-10 Foseco International Limited Procédé et dispositif pour boucher le trou de coulée d'un récipient métallurgique
EP0635071A1 (fr) 1992-04-07 1995-01-25 Berthold Stilkerieg Procede et dispositif visant a eviter la contamination de l"acier de coulee par le laitier de decrassage dans un convertisseur basculant.
JPH07256437A (ja) * 1994-03-18 1995-10-09 Toshiba Ceramics Co Ltd 冶金用容器の出鋼口閉塞用膨張性プラグ
US20110148013A1 (en) * 2008-08-21 2011-06-23 Berthold Stilkerieg Sealing Plug for Tiltable Converters
GB2534231A (en) * 2015-01-19 2016-07-20 Monocon Int Refractories Ltd Slag shield

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2549728C2 (de) * 1975-11-06 1977-10-06 Stahlwerke Peine-Salzgitter Ag, 3150 Peine Vorrichtung zum Verschließen des Abstichloches eines Konverters
DE102005015469A1 (de) * 2005-04-04 2006-10-05 Stilkerieg, Berthold, Dipl.-Ing. Vorrichtung zum zeitweisen Verschließen des Konverterabstichloches mit verbesserten Stopfeneigenschaften

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315311A1 (fr) * 1987-10-16 1989-05-10 Foseco International Limited Procédé et dispositif pour boucher le trou de coulée d'un récipient métallurgique
EP0635071A1 (fr) 1992-04-07 1995-01-25 Berthold Stilkerieg Procede et dispositif visant a eviter la contamination de l"acier de coulee par le laitier de decrassage dans un convertisseur basculant.
JPH07256437A (ja) * 1994-03-18 1995-10-09 Toshiba Ceramics Co Ltd 冶金用容器の出鋼口閉塞用膨張性プラグ
US20110148013A1 (en) * 2008-08-21 2011-06-23 Berthold Stilkerieg Sealing Plug for Tiltable Converters
EP2315859B1 (fr) 2008-08-21 2013-09-18 Veronica Stilkerieg Bouchon d'obturation pour convertisseurs basculants
GB2534231A (en) * 2015-01-19 2016-07-20 Monocon Int Refractories Ltd Slag shield

Also Published As

Publication number Publication date
DE102020102105A1 (de) 2021-07-29
EP3859257B1 (fr) 2022-10-19
EA202090481A1 (ru) 2021-08-24
EA038416B1 (ru) 2021-08-26
UA125972C2 (uk) 2022-07-20

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