EP3228403B1 - Verfahren und vorrichtung zum warmhalten flüssiger metalle - Google Patents

Verfahren und vorrichtung zum warmhalten flüssiger metalle Download PDF

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Publication number
EP3228403B1
EP3228403B1 EP17162249.1A EP17162249A EP3228403B1 EP 3228403 B1 EP3228403 B1 EP 3228403B1 EP 17162249 A EP17162249 A EP 17162249A EP 3228403 B1 EP3228403 B1 EP 3228403B1
Authority
EP
European Patent Office
Prior art keywords
melt
burner
container
fuel
oxygen
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.)
Active
Application number
EP17162249.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3228403A3 (de
EP3228403A2 (de
Inventor
Johannes Rauch
Michael Potesser
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.)
Messer Austria GmbH
Original Assignee
Messer Austria GmbH
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 Messer Austria GmbH filed Critical Messer Austria GmbH
Priority to SI201730316T priority Critical patent/SI3228403T1/sl
Priority to PL17162249T priority patent/PL3228403T3/pl
Priority to RS20200777A priority patent/RS60444B1/sr
Publication of EP3228403A2 publication Critical patent/EP3228403A2/de
Publication of EP3228403A3 publication Critical patent/EP3228403A3/de
Application granted granted Critical
Publication of EP3228403B1 publication Critical patent/EP3228403B1/de
Priority to HRP20201180TT priority patent/HRP20201180T1/hr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
    • B22D41/01—Heating means
    • B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
    • B22D41/01—Heating means

Definitions

  • the invention relates to a method for keeping liquid metals warm according to the preamble of claim 1.
  • the invention further relates to a corresponding device.
  • molten metal for example a melt of aluminum or iron
  • transport pans Special transport containers, also called “transport pans”, are used for the transport, which, depending on the type of vehicle and the metal to be transported, can hold between 500 kg and 200 t of molten metal.
  • liquid metal transport containers are generally preheated.
  • a device in which a transport pan between its uses is heated by an air-natural gas burner.
  • the pore burner is either arranged in the lid of the transport vessel or extends along a column which is inserted into the center of the empty container during the heating process.
  • this arrangement is not suitable for heating a liquid melt, since the pores of the burner are quickly clogged by penetrating liquid metal, which would make it impossible for the smoke gases to penetrate.
  • the temperature of liquid metal decreases by around 5-15 K per hour in conventional transport containers. Since at the same time the initial temperature has a certain value for metallurgical reasons, in the case of liquid aluminum around 950 ° C, should not exceed, the temperature of the melt proves to be not unproblematic, particularly in road transport, since unforeseeable events, such as a traffic jam, can lead to considerable delays in transport, for example.
  • WO 2006/133679 A2 describes a method and a device for setting predetermined melting properties in a liquid metal, in particular aluminum.
  • the container holding the liquid metal is equipped with a heating device which can be lowered into the melt and by means of which the temperature of the liquid metal can be maintained even during longer transport times.
  • An electrical heating element or a burner which is accommodated in a protective tube, serves as the heating device.
  • a gas purging plug is provided on the bottom of the container, by means of which a gas can be introduced into the liquid metal. The rising gas bubbles create a flow through which the temperature distribution in the melt is homogenized. With this arrangement, the temperature of the melt can be maintained over a longer period of time with satisfactory homogeneity.
  • the device is very complex in construction and still needs improvement in terms of energy efficiency.
  • the invention is therefore based on the object of increasing the energy utilization when keeping a melt warm and at the same time improving the homogeneity of the temperature profile of the melt.
  • a method for keeping liquid metals warm in which a metallic melt is accommodated in a container and is heated by means of a burner, which is accommodated in an immersion tube inserted vertically or obliquely in the melt, by burning a fuel with oxygen, is characterized in that during the combustion of the fuel in the burner, the flue gases generated are introduced into the melt through at least one flow opening of the dip tube.
  • the burner is ignited in the immersion tube which is initially still arranged above the melt, forming a flame.
  • the dip tube is then lowered so deep into the melt that at least the at least one flow opening, but preferably a substantial section of the dip tube that surrounds the flow opening, is located below the surface of the melt.
  • the lower part of the immersion tube is preferably inserted into the melt up to at least the level of the flame generated by the burner. The flue gases produced during the combustion of the fuel penetrate into the melt from the at least one flow opening and rise in the form of gas bubbles in the melt.
  • the flow opening is preferably arranged on the lower end face of the dip tube, that is to say immersed in the melt; the parts of the immersion tube that protrude from the melt in the intended use, on the other hand, are preferably sealed gas-tight, so that the flue gases can only escape through the melt.
  • the liquid metal is therefore heated not only via the walls of the immersion tube heated by the burner, but also via the surfaces of the gas bubbles of the flue gases rising in the melt.
  • the total surface area available for heat transfer is thus significantly increased.
  • the rising gas bubbles after the mammoth pump effect, circulate the melt and thus homogenize the temperature distribution. Since essentially only water and / or carbon dioxide and / or oxygen are present in the flue gases when using natural gas and / or hydrogen as fuel, there is no contamination of the liquid metal.
  • the flue gases are preferably introduced into the melt in a lower region of the container in order to ensure that the ascending gas bubbles remain in the melt for as long as possible.
  • the dip tube has one or more flow openings on its lower end face and / or in an end section bordering this end face.
  • the immersion tube is inserted so deep into the melt that at least two thirds, preferably at least 80%, of the volume of the melt is above the flow opening or the flow openings.
  • the supply of fuel and / or oxygen to the burner is expediently regulated as a function of physical or chemical parameters of the melt.
  • the temperature of the melt for example, serves as a controlled variable, which is recorded continuously or at predetermined time intervals using a suitable measuring probe.
  • the measured values are transmitted to a control unit, by means of which they are used to regulate the supply of fuel and / or oxygen to the burner.
  • the burner is preferably controlled in two stages or in proportion to the deviation of the measured variable from a predetermined target value.
  • care must be taken to ensure that no liquid metal comes into contact with the burner orifice if the burner output is reduced or the burner is switched off.
  • the immersion depth of the immersion tube should also be regulated accordingly and the immersion tube should be completely lifted out of the melt for the duration of a burner standstill.
  • the object of the invention is also achieved with a device having the features of claim 4.
  • the device has a container intended for holding a metallic melt and a heating device which can be moved vertically or obliquely from above into the interior of the container by means of a feed device and which comprises a burner accommodated in an immersion tube and connected to a feed line for a fuel and a feed line for oxygen , wherein the immersion tube is equipped in its lower section with at least one flow opening which is permeable to fuel gases of the burner.
  • the device is characterized in that the immersion tube is made gas-tight in a section arranged outside the melt when the device is in use, with the exception of at least one passage opening for the burner and / or for the feed lines for the fuel and / or the oxidizing agent.
  • the burner of the heating device is accommodated in an immersion tube, the upper section of which, with the exception of the feed lines for the fuel and oxidant of the burner, is sealed gas-tight and allows the flue gases flowing out of the burner to escape only through one or more flow openings which are in a lower section of the Immersion tube is / are arranged, for example in an end face opposite the feed lines of the burner or in a part of the side wall of the dip tube adjacent to this end face.
  • the heating device is guided through an opening in a cover or a wall of the container and is designed to be movable in the axial direction between two adjustment positions during operation of the device by means of the feed device.
  • the mouth of the burner accommodated in the immersion tube is arranged vertically spaced from a predetermined level, at which the surface of a molten bath filled into the container is present during operation of the device. This means that at least the burner has no contact with the weld pool.
  • the burner is switched on or off in this position.
  • the heating device is also in this position.
  • the immersion tube is immersed at least with a lower section into the melt pool, at least to such an extent that the flow opening or the flow openings are located below the surface of the melt pool.
  • the heating device is fed into the melt either vertically or obliquely from above.
  • the burner Before the heater is moved to the second position, the burner must be lit so that it flows through the flow opening (s) escaping smoke gases prevent the liquid metal from entering the dip tube and direct contact of the liquid metal with the burner. After the heating process has ended, the heating device is moved back to the first position and then the burner is switched off.
  • the burner is fixed in the immersion tube and is arranged, for example, along the axis of the immersion tube.
  • the preferably cylindrical immersion tube is equipped with one or more flow openings, which is / are arranged in a section immersed in the melt when the device is used, preferably in the lower end face of the immersion tube.
  • the lower end face of the dip tube is completely open.
  • the dip tube In order to ensure that the flue gases generated during combustion are introduced as completely as possible into the melt, the dip tube is designed to be gas-tight on its upper end face and in the jacket section which is not below the surface of the melt after the dip tube has been immersed.
  • the immersion tube has only one through opening or more through openings for the burner and / or the feed lines for the fuel and / or the oxidizing agent, the connection between the burner or the feed lines and the walls of the dip tube likewise being at least largely gas-tight and no or only negligible amount of flue gas can escape there.
  • the container is designed as a transport container for transporting a metallic melt.
  • the container is a container permanently mounted or mountable on a road or rail vehicle for transporting liquid metals, such as liquid iron or liquid aluminum.
  • the heating device mounted on the container enables continuous temperature control of the melt even during transport. Due to the vertical adjustability of the heating device, the burner can also be switched off completely.
  • the device 1 for keeping a liquid metal, for example liquid aluminum, warm comprises a container 2, for example a crucible or a pan, which is suitable, for example, for transport on a road or rail vehicle, and a removable lid 3 which closes the container 2 when used as intended serves the container 2 for receiving a melt 4 up to the level of a level 5.
  • the container 2 and lid 3 each consist of a refractory, heat-resistant material or are each lined with a refractory material (not shown here).
  • a recess 6 is provided in the cover 3 for a heating device 7 described in more detail below.
  • the heating device 7 comprises a burner 10 accommodated in an immersion tube 9, for example in the form of a circular cylinder, and is arranged in the vertical direction by means of a feed device 11 which is arranged on the outside of the cover 3 and is not explained in detail here. into the interior of the container 3 and out of the interior of the container 3, movable.
  • the melt 4 is to be kept at a temperature of, for example, 780.degree.
  • the burner 10 is a fuel-oxygen burner with a central feed 13, connected to a fuel line 12, for a gaseous or liquid fuel, for example natural gas, and a connection, connected to an oxygen line 14, on the radially outside to the feed for the fuel subsequent oxidant supply 15 and an ignition device 16.
  • the burner 10 is fixed in a manner not shown here in the dip tube 9 and aligned along its axis.
  • the fuel line 12 and the oxygen line 14 are connected to sources of fuel and oxygen, not shown here.
  • the dip tube 9 is made of a ceramic or non-ceramic material and is open at its lower end face 17. Instead of or in addition to a completely open end face 17, one or more openings can moreover be arranged in a lower section of the immersion tube 9, that is, when used as intended, below the level 5 of a melt 4, in particular those with which smoke gases escaping from the immersion tube 9 in the lateral direction be directed into the melt.
  • the length of the immersion tube 9 is dimensioned such that when moving upwards with the aid of the feed device 11, a position is reached in which the lower end face 17, or at least the burner 10, is above the level 5 of the melt during the movement downward, however, the immersion tube is immersed deeply in the melt 4, and the burner 10 is positioned with its mouth below the level 5.
  • the immersion tube 9 On its upper end face 18, the immersion tube 9 is designed to be largely gas-tight and only has bushings 21, 22 for the lines 12, 14, in which these in turn are at least largely gas-tight, so that flue gas does not emit in this direction, or only to an insignificant amount can escape the dip tube 9.
  • the crucible 2 is filled with a melt 4 up to the level 5 and then the cover 3 with the heating device 6 is placed on the crucible 2.
  • the heating device 7 is initially still in an upper position in which the lower end face 17 of the immersion tube 9, or at least the burner 10, is above the level 5.
  • fuel preferably natural gas
  • oxygen preferably oxygen with a purity of at least 95% by volume
  • the heating device 7 is lowered by means of the feed device 11 until a lower section of the immersion tube 9 and in particular the end face 17 is inside the melt 4, as in FIG Fig. 1 shown.
  • the pressure of the flue gases produced during combustion prevents the melt from penetrating into the interior of the immersion tube 9; the flame 19 is therefore not in direct contact with the melt 4 or only at its outermost tip. Instead, the smoke gases are pushing - As indicated by arrows 23 - from the open, lower end face 17 of the dip tube 9, penetrate into the melt 4 and bead up in the form of gas bubbles 24. Due to the large number of ascending gas bubbles 24, a large area is available for heat transfer from the flue gas into the melt 4.
  • the rising gas bubbles 24 lead to a continuous circulation of the melt 4 due to the mammoth pump effect, through which the temperature distribution in the melt 4 is homogenized.
  • heat transfer also takes place on the wall of the immersion tube 9. The smoke gases emerging from the melt 4 are then discharged via a trigger 25 in the cover 3.
  • the supply of thermal energy in the melt 4 can, moreover, in the embodiment according to Fig. 1 can be regulated depending on the temperature of the melt 4.
  • a temperature measuring probe 27 which is guided through the wall of the cover 3, is in data connection with a control unit 28 - as indicated by a dashed line.
  • the probe 27 enables the temperature of the melt 4 to be measured continuously.
  • the control unit is in data communication with control valves 29, 30 in the lines 12, 14.
  • the output of the burner 10 can be controlled proportionally or stepwise as a function of the temperature of the melt 4 detected at the temperature measuring probe 27 and used, for example, to keep the temperature of the melt 4 at a constant level hold predetermined value.
  • automated heating is also possible during transport.
  • the device according to the invention is suitable for keeping various metals, in particular iron or aluminum, warm up to a temperature of 1000.degree.
  • the large heat exchange surface on the gas bubbles rising in the melt ensures a high heating efficiency as well as good temperature homogeneity in the melt due to the constant movement induced by the rising gas bubbles.
  • the flue gases consist largely of CO 2 , H 2 O and O 2 , which do not negatively affect the melt.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Forging (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP17162249.1A 2016-03-24 2017-03-22 Verfahren und vorrichtung zum warmhalten flüssiger metalle Active EP3228403B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SI201730316T SI3228403T1 (sl) 2016-03-24 2017-03-22 Postopek in naprava za ohranjanje toplote tekočih kovin
PL17162249T PL3228403T3 (pl) 2016-03-24 2017-03-22 Sposób i urządzenie do utrzymywania ciepła ciekłych metali
RS20200777A RS60444B1 (sr) 2016-03-24 2017-03-22 Postupak i aparatura za održavanje tečnih metala toplim
HRP20201180TT HRP20201180T1 (hr) 2016-03-24 2020-07-29 Postupak i uređaj za održavanje zagrijanih tekućih metala

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016003728.8A DE102016003728A1 (de) 2016-03-24 2016-03-24 Verfahren und Vorrichtung zum Warmhalten flüssiger Metalle

Publications (3)

Publication Number Publication Date
EP3228403A2 EP3228403A2 (de) 2017-10-11
EP3228403A3 EP3228403A3 (de) 2017-11-15
EP3228403B1 true EP3228403B1 (de) 2020-06-03

Family

ID=58401457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17162249.1A Active EP3228403B1 (de) 2016-03-24 2017-03-22 Verfahren und vorrichtung zum warmhalten flüssiger metalle

Country Status (9)

Country Link
EP (1) EP3228403B1 (pl)
DE (1) DE102016003728A1 (pl)
ES (1) ES2797928T3 (pl)
HR (1) HRP20201180T1 (pl)
HU (1) HUE050839T2 (pl)
LT (1) LT3228403T (pl)
PL (1) PL3228403T3 (pl)
RS (1) RS60444B1 (pl)
SI (1) SI3228403T1 (pl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111604493B (zh) * 2020-06-19 2021-12-07 武汉钢铁有限公司 一种中间包烘烤防护系统及方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3530043A1 (de) 1985-08-22 1987-02-26 Linde Ag Verfahren und vorrichtung zum warmhalten einer schmelze in einer pfanne
DE3637065A1 (de) 1986-10-31 1988-05-05 Technometal Ges Fuer Metalltec Pfanne mit beheizungsvorrichtung
JP2831376B2 (ja) * 1989-04-28 1998-12-02 東邦瓦斯株式会社 浸漬バーナ型低圧鋳造炉
JP3485826B2 (ja) * 1998-03-13 2004-01-13 株式会社トウネツ 溶解保持炉
US6540957B1 (en) 1999-08-27 2003-04-01 Kawasaki Steel Corporation Ladle, a ladle heating system and methods of heating the ladle
JP4125944B2 (ja) * 2002-11-15 2008-07-30 照雄 神成 溶融した金属を一時的に受ける取鍋の内部を予め加熱する装置及び方法
EP1893931A2 (de) 2005-06-13 2008-03-05 Karl Konzelmann Metallschmelzwerke GmbH & Co. Kg Verfahren zum einstellen vorgegebener schmelzeeigenschaften in einem flüssigmetall, insbesondere flüssigaluminium, behandlungssystem, transportbehälter und transportfahrzeug für flüssigmetall
EP2026922A1 (de) 2006-05-16 2009-02-25 SMS Demag AG Heizeinrichtung zum vorwärmen eines flüssigmetall-transportbehälters
JP5832332B2 (ja) * 2012-02-22 2015-12-16 東邦瓦斯株式会社 溶湯浸漬バーナ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
RS60444B1 (sr) 2020-07-31
SI3228403T1 (sl) 2020-08-31
PL3228403T3 (pl) 2020-12-14
LT3228403T (lt) 2020-08-25
HUE050839T2 (hu) 2021-01-28
EP3228403A3 (de) 2017-11-15
EP3228403A2 (de) 2017-10-11
HRP20201180T1 (hr) 2020-11-13
ES2797928T3 (es) 2020-12-04
DE102016003728A1 (de) 2017-09-28

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