EP3009778A1 - Vorrichtung und verfahren zum laden und entladen eines aufwärmofens - Google Patents

Vorrichtung und verfahren zum laden und entladen eines aufwärmofens Download PDF

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Publication number
EP3009778A1
EP3009778A1 EP14810703.0A EP14810703A EP3009778A1 EP 3009778 A1 EP3009778 A1 EP 3009778A1 EP 14810703 A EP14810703 A EP 14810703A EP 3009778 A1 EP3009778 A1 EP 3009778A1
Authority
EP
European Patent Office
Prior art keywords
furnace
rotating door
billet
unloading
loading
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.)
Withdrawn
Application number
EP14810703.0A
Other languages
English (en)
French (fr)
Other versions
EP3009778A4 (de
Inventor
Felipe Vallejo Bayona
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.)
Fives Steel EspaIa SA
Original Assignee
Fives Stein Bilbao 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 Fives Stein Bilbao SA filed Critical Fives Stein Bilbao SA
Publication of EP3009778A1 publication Critical patent/EP3009778A1/de
Publication of EP3009778A4 publication Critical patent/EP3009778A4/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/22—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on rails, e.g. under the action of scrapers or pushers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/38—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/39—Arrangements of devices for discharging
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • 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
    • F27D3/0024—Charging; Discharging; Manipulation of charge of metallic workpieces
    • 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
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
    • 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
    • F27D3/04—Ram or pusher apparatus

Definitions

  • the invention relates to a device for loading and unloading billets and other products, such as tubes or bars, in steel reheating furnaces by means of a rotating door.
  • the loading and unloading of billets in steel reheating furnaces causes air inlets in the furnace and, sometimes, this process is made by means of cooled equipment installed inside the furnace causing important thermal losses that are extremely damaging to the heating quality, as well as the furnace efficiency.
  • Air inlets caused by door openings can also disrupt the operation of the burners, in particular increasing the amount of pollutants in the furnace, such as nitrogen oxides, NOx.
  • the air inlets caused by the opening of the unloading door can also increase the amount of scale produced in the furnace.
  • FR2657152 describes a device containing a cylinder mounted in the furnace around an horizontal axis in which are disposed two diametrically opposite housings receiving each of them a billet or long product, and a block of variable width located in the cylinder sliding between housings.
  • This block includes the extendable elements that can be brought near or away from each other in order to push towards outside the cylinder, each product received in the first housing after a rotation of 180 degrees of the cylinder.
  • This device allows the uniform reheating of long steel products and thereby obtain improved characteristics for them.
  • the device of the invention includes a rotating door, with a cylindrical profile and adjusted to separate completely the inside of the furnace from the outside.
  • the door comprises a trimmed angular sector, wherein the billet is placed for its introduction and extraction, such that, the transfer of the billet between the exterior and interior of the furnace is allowed by the simple rotation of the door.
  • the device is completed by a transfer element, which is the only element necessary to move the billet from the feeding roller conveyor to the rotating door, as well as from the rotating door to the beams placed inside the furnace. That is, the transfer element is the responsible for loading and unloading movements between outside and inside the furnace.
  • the method object of the invention comprises the transfer of the billet from the outside of the furnace to the inside by means of two simple mechanical movements: a first rotation of 90 degrees of the rotating door and the linear movement of the transfer element, such that in this movement the outside and the inside are completely isolated.
  • a separation between the outside and the inside of the furnace is optimized precisely because of the presence of the rotating door, which reduces the pressure variations inside and the cool air inlets; saving energy, reducing pollutant emissions (NOx) and reducing the heating or surface defects which may happen in the product.
  • NOx pollutant emissions
  • the loading and the unloading of billets (or bars or tubes on each case) in a steel reheating furnace is carried out frontally or laterally.
  • FIG 1 shows the principle of the frontal loading according to the prior art
  • figures 2 and 3 show the principle of the lateral loading.
  • these example embodiments have several problems that are solved by the present invention.
  • the figure 1 shows a longitudinal section of the furnace (4) comprising a plurality of walls that form an internal enclosure in which are housed a plurality of beams (1) that support the bed of products (2) to be transferred from the furnace inside (4) to the outside to ensure the reheating up to the target temperature.
  • the billet (6) to be loaded is brought in front of the furnace (4) by means of a roller conveyor (9) whose rollers rotate on bearings (10) driven by a gear motor (11).
  • the billet (6) is transferred from the roller conveyor (9) to the beams (1) of the furnace by means of the fingers (7) of a pusher, which displaces the product from the roller conveyor (9) to the sliders (8) and, on them, to the beams (1) to bring the product to the marked position (3).
  • the front door (5) of the furnace (4) must be open across the entire width of the furnace, which causes an important pressure change of the internal atmosphere of the furnace and allows a passage of the outside air, which pollutes the internal atmosphere of the furnace, decreasing the internal temperature and, therefore, its overall performance.
  • this opening keeps the furnace area cooler, which reduces the effective length of the heating in the furnace.
  • the figure 2 shows the principle of lateral loading of the billets in a reheating furnace.
  • the loading door (12) is in one side of the furnace and it is smaller in size than a frontal loading door (5), as it corresponds to the billet section while the front door corresponds to the length of the billet.
  • roller conveyor (9) are placed inside the furnace (4) and are mounted on bearings (10) placed outside as well as the motor.
  • the roller conveyor (9) ensure the transfer of the billet from the outside to furnace inside, so that the billet is pushed from the roller conveyor (9) on the beams (11) by the pusher fingers (7) bringing the billet (6) to the loading position, as shown in figure 2 .
  • the sketch shown in figure 1 for frontal unloading is identical to the described one, that is, the pusher machine that comprises the fingers (7) executes a rectangular movement to collect the product from the beams (1) of the furnace through the opening of the front door (5) and to place it on the roller conveyor (9) which will carry out the evacuation of the billet (6) to the rolling mill for the next stage of the steelmaking process.
  • the devices shown for the unloading of the billets have the same kind of problems than the ones for the loading, that is, the presence of refrigerated mechanical elements that reduce the energy efficiency of the furnace, or the existence of unloading doors that mean important inlets of air decreasing the furnace efficiency and causing additional oxidation in products, which increases material loss and can cause defects in the finished products during the subsequent rolling process.
  • the figure 4 shows the longitudinal section of the reheating furnace for billets that includes the device of the invention. That figure 4 shows the furnace chamber (4), the beams (1) for supporting the product (2), a roller conveyor (9) to transport the billet (6) to be loaded in front of the furnace and outside the furnace, a loading pusher machine provided with a plurality of fingers (7).
  • This furnace is provided with a rotating door (14) that rotates around an axis (15), which is refrigerated.
  • the rotating door (14) is of cylindrical section, with an angular sector (16) trimmed at certain angle and arranged to introduce the billet (6) in the furnace. That is, the angular sector (16) is aligned horizontally with the roller conveyor (9) on one side (16a), while the other side (16b) opposite to the first, is arranged to work like a stopper during the introduction of the billets (6).
  • the angular sector (16) is about 90°.
  • the figure 5 shows the first sequence of loading the billet (6), wherein the fingers (7) of the pusher machine move the billet (6) from the roller conveyor (9) on the slides (13) of the rotating door (14) to stop with the angular sector (16) trimmed in the rotating door (14) like described above.
  • the figure 6 shows the operation of loading a billet (6).
  • the rotating door (14) has rotated around its axis (15), for example, by the action of one or more hydraulic cylinders not shown in the figure.
  • the billet (6) is placed inside the furnace chamber (4), on a slide vertically aligned with the upper plane of the beams (1).
  • the figure 7 shows the fingers (7) of the pusher machine which through openings in the rotating door (14), have displaced the billet (6) from the slides of the rotating door (14) to the beams (1), till to reach the maximum position defined by the fingers (7) stroke, depending on the dimensions of the billet (6) and the desired load in the furnace (4). After the retraction of the fingers (7), the rotating door (14) returns to the position shown in figure 4 .
  • the loading rotating door (14) is cylindrical and manufactured, for example, with refractory concrete or a combination of metal structures lined with refractory concrete or an insulating equivalent.
  • the cylindrical shape of the rotating door (14) is such that it fits perfectly to the walls of the furnace (4), in order to ensure a good tightness between air and fumes to isolate perfectly the atmosphere inside the furnace (4) from the outside atmosphere.
  • This tightness can be improved, if necessary, by adding seals or scrapers, for example, made of fibrous refractory whose flexibility allows to compensate any possible gap between the furnace walls and the rotating door (14) in the open or closed position, or during the movement of the door.
  • the figures 8 and 9 show the rotating door (14) in the unloading position of the billet into the furnace (4). As in figures from 4 to 7, it can be seen how the connection between the external shape of the rotating door (14) and the furnace wall (4) ensures the tightness.
  • the openings through which the fingers (7) of the pusher machine go through the rotating door (14) will be adjusted to the maximum, so that between the fingers (7) and the openings there is not a clearance, i.e., the clearance is the minimum necessary to allow the passage of the fingers (7).
  • the technology of the pusher machine is well known for a person skilled in the art to obtain the linear movement of the fingers hydraulically using one or more cylinders, or mechanically, by a motor.
  • the rotating door (14) can be mounted on two bearings arranged at the ends or intermediate support bearings for longer doors.
  • the device allows the unloading of a billet in a reheating furnace, significantly reducing the heat losses caused by air inlets or by the presence of the cooled elements inside.
  • the energy balance of the furnace improves and the quantity of pollutants is reduced.
  • the figure 8 shows the unloading sequence of the invention.
  • the last product (3) in a first position (6) is transferred by the beams (1) of the furnace (4) to the rotating door (14) in a second position (6').
  • the product ready to be unloading is in a third position (6").
  • the arms of the transfer machine are known for a person skilled in the art, for example with a lineal movement of the fingers (17) driven by a gear motor meshed with a rack via a pinion, where that rack is integrally attached to a finger (17), and wherein the lifting movement is controlled by one or more hydraulic cylinders.
  • the figure 10 shows a variant of the invention including a transfer machine with fingers (17).
  • the figure shows how the last billet (6) on the beams (1) of the furnace (4) is lifted by the fingers (17) of the transfer machine that moves with a substantially rectangular cycle to the rotating door (14).
  • the figures 8 and 10 show the rotating door (14) positioned to receive the product to be unloading and in figure 9 , the rotating door (14) is positioned to unloading the product, with a hermetic sealing of the furnace (4), preventing air inlets which can create scale on the surface of the product, besides all disadvantages mentioned above. This absence of air does not further disrupts burner's combustion, which improves the quality of that combustion and the generation of contaminants.
  • this heating and unloading process can be applied to all kinds of steel products such as bars of round section, square or half-finished products such as "beam blanks" and tubes. Likewise it can be applied in heat treatment furnaces with continuous or batch operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP14810703.0A 2013-06-12 2014-05-14 Vorrichtung und verfahren zum laden und entladen eines aufwärmofens Withdrawn EP3009778A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201330873A ES2425304B2 (es) 2013-06-12 2013-06-12 Dispositivo y método para el enhornamiento y deshornamiento en un horno de recalentamiento
PCT/ES2014/070399 WO2014198977A1 (es) 2013-06-12 2014-05-14 Dispositivo y método para el enhornamiento y deshornamiento en un horno de recalentamiento

Publications (2)

Publication Number Publication Date
EP3009778A1 true EP3009778A1 (de) 2016-04-20
EP3009778A4 EP3009778A4 (de) 2016-06-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14810703.0A Withdrawn EP3009778A4 (de) 2013-06-12 2014-05-14 Vorrichtung und verfahren zum laden und entladen eines aufwärmofens

Country Status (3)

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EP (1) EP3009778A4 (de)
ES (1) ES2425304B2 (de)
WO (1) WO2014198977A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106440821B (zh) * 2016-11-28 2018-07-10 无锡市莱达热工工程有限公司 加热炉推料机构
JP7401572B2 (ja) * 2022-01-26 2023-12-19 中外炉工業株式会社 炉のワーク装入抽出装置
JP7401571B2 (ja) * 2022-01-26 2023-12-19 中外炉工業株式会社 炉に備えられるワークの装入抽出装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE629260A (de) * 1961-06-27
US3222043A (en) * 1964-04-17 1965-12-07 Sunbeam Equip Furnace transfer mechanism
FR2449863A2 (fr) * 1979-02-26 1980-09-19 Heurtey Metallurgie Dispositif d'enfournement et de defournement de billettes rondes et carrees et de blooms
JPS55134125A (en) * 1979-04-06 1980-10-18 Nippon Steel Corp Hot and cold slab mixing heating furnace and its heating method
US4397600A (en) * 1981-04-10 1983-08-09 Midland-Ross Corporation Device for feeding material to a furnace
JPS5983716A (ja) * 1982-11-05 1984-05-15 Nippon Steel Corp 加熱炉の回動扉
JPS59190316A (ja) * 1983-04-14 1984-10-29 Kawasaki Steel Corp ウオ−キングビ−ム式加熱炉の開口
DE3479529D1 (en) * 1983-07-06 1989-09-28 Italimpianti Method and walking beam furnace for the intermediate heating of pipes in hot rolling mills
JPS60234918A (ja) * 1984-05-04 1985-11-21 Nippon Steel Corp シ−ル装置を備えた加熱炉の装入・抽出装置
JPS60234917A (ja) * 1984-05-04 1985-11-21 Nippon Steel Corp シ−ル装置を備えた加熱炉の装入・抽出装置
FR2654962A1 (fr) * 1989-11-24 1991-05-31 Stein Heurtey Dispositif de retournement de produits siderurgiques de section carree ou rectangulaire sur un angle de 180degre .
FR2657152A1 (en) 1990-01-18 1991-07-19 Siderurgie Fse Inst Rech Method and device for reheating in a furnace long metallurgical products such as billets

Also Published As

Publication number Publication date
EP3009778A4 (de) 2016-06-08
WO2014198977A1 (es) 2014-12-18
ES2425304A1 (es) 2013-10-14
ES2425304B2 (es) 2014-05-05

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