EP3228403A2 - Procédé et dispositif destinés à conserver au chaud des métaux liquides - Google Patents

Procédé et dispositif destinés à conserver au chaud des métaux liquides Download PDF

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Publication number
EP3228403A2
EP3228403A2 EP17162249.1A EP17162249A EP3228403A2 EP 3228403 A2 EP3228403 A2 EP 3228403A2 EP 17162249 A EP17162249 A EP 17162249A EP 3228403 A2 EP3228403 A2 EP 3228403A2
Authority
EP
European Patent Office
Prior art keywords
melt
burner
container
dip tube
fuel
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
EP17162249.1A
Other languages
German (de)
English (en)
Other versions
EP3228403A3 (fr
EP3228403B1 (fr
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 PL17162249T priority Critical patent/PL3228403T3/pl
Priority to RS20200777A priority patent/RS60444B1/sr
Priority to SI201730316T priority patent/SI3228403T1/sl
Publication of EP3228403A2 publication Critical patent/EP3228403A2/fr
Publication of EP3228403A3 publication Critical patent/EP3228403A3/fr
Application granted granted Critical
Publication of EP3228403B1 publication Critical patent/EP3228403B1/fr
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 liquid according to the preamble of claim 1.
  • the invention further relates to a corresponding device.
  • molten metal such as a melt of aluminum or iron
  • transport pans Special transport containers, also called “transport pans”, are used for transport. Depending on the type of vehicle and the metal to be transported, they can absorb between 500 kg and 200 t of molten metal.
  • liquid metal transport containers are generally preheated.
  • a device in which a transport pan between their inserts is heated by means of an air-gas burner.
  • a liquid metal transport container is described with preheating, in which the container is pre-heated before its use by means of a field-like pore burner.
  • the pore burner is either arranged in the cover of the transport vessel or extends along a column which is guided centrally during the heating process in the empty container.
  • this arrangement is not suitable to heat a liquid melt, since the pores of the burner would be clogged quickly by penetrating liquid metal and thus penetration of the flue gases would be impossible.
  • liquid metal decreases in conventional transport containers about 5-15 K per hour. Since at the same time the initial temperature for metallurgical reasons a certain value, in the case of liquid aluminum about 950 ° C, should not exceed the temperature maintenance of the melt, especially in road transport proves to be problematic, since it can come, for example, by unforeseeable events, such as a traffic jam to considerable delays in transport.
  • the container receiving the liquid metal is equipped with a heater which can be lowered into the melt, by means of which the temperature of the liquid metal can be maintained even during longer transport times.
  • the heating device is an electric heating element or a burner, which is accommodated in a protective tube.
  • a gas purging plug is provided at the bottom of the container, by means of which a gas can be registered in 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 with a satisfactory homogeneity over a long period of time.
  • the device is very complex in construction and in terms of energy efficiency still in need of improvement.
  • the invention is therefore based on the object to increase the energy utilization when holding a melt while also improving the homogeneity of the temperature profile of the melt.
  • a method for keeping liquid metals in liquid, in which a metallic melt is received in a container and heated by burning a fuel, which is received in a vertically or obliquely introduced into the melt dip tube by burning a fuel with oxygen, according to the invention is characterized in that the resulting during combustion of the fuel in the burner flue gases are at least substantially registered by at least one flow opening of the dip tube in the melt.
  • the burner is ignited in the immersion tube initially arranged above the melt to form a flame.
  • the dip tube is lowered so deep into the melt, that at least the at least one flow opening, but preferably a substantial and the flow opening comprehensive section of the dip tube is below the surface of the melt.
  • the lower part of the dip tube is retracted to at least the height of the flame generated by the burner in the melt.
  • the flue gases produced during the combustion of the fuel are forced out of the at least one flow opening into the melt 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, ie, immersed in the melt; on the other hand, the parts of the immersion tube projecting from the melt during normal use are preferably closed in a gas-tight manner, so that the flue gases can only escape through the melt via the path.
  • the heating of the liquid metal is thus carried out not only on the heated walls of the immersion tube from the burner, but also on the surfaces of the ascending in the melt gas bubbles of the flue gases.
  • the overall surface available for the heat transfer is thus significantly increased.
  • the ascending gas bubbles after the mammoth pump effect ensure a circulation of the melt and thus homogenization of the temperature distribution. Since the use of, in particular, natural gas and / or hydrogen as fuel substantially only water and / or carbon dioxide and / or oxygen in the flue gases are present, 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 the longest possible duration of residence of the ascending gas bubbles in the melt.
  • the dip tube has one or more flow openings on its lower end side and / or in an end section adjoining this end side.
  • the dip tube is retracted so deep into the melt, that at least two-thirds, preferably at least 80% of the volume of the melt are above the flow opening or the flow openings.
  • the supply of fuel and / or oxygen to the burner is controlled as a function of physical or chemical parameters of the melt.
  • a control variable for example, the temperature of the melt, which is detected with a suitable probe continuously or at predetermined time intervals.
  • 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 control of the burner is preferably carried out in two stages or proportional to the deviation of the measured variable from a predetermined desired value.
  • care must be taken to ensure that no liquid metal comes into contact with the burner outlet when the burner output is reduced or when the burner is switched off. In this case, the immersion depth of the dip tube should be controlled accordingly and the dip tube for the duration of a burner standstill be completely lifted out of the melt.
  • the object of the invention is also achieved with a device having the features of claim 4.
  • the device comprises a container intended for receiving a metallic melt and a heating device which can be inserted vertically or obliquely from above into the container interior and which comprises a burner accommodated in a dip tube and connected to a supply line for a fuel and a supply line for oxygen ,
  • the device according to the invention is characterized in that the dip tube is equipped in its lower portion with at least one permeable for combustion gases of the burner flow opening.
  • the burner of the heater is accommodated in a dip tube, the upper portion, except for the supply lines for fuel and oxidizing agent of the burner, gas-tight and allows escape of the effluent from the burner flue gases only one or more flow openings in a lower portion of the Immersion tube is / are arranged, for example, in one of the supply lines of the burner opposite end face or in an adjacent to this end part of the side wall of the dip tube.
  • the heater is passed through an opening in a lid or a wall of the container and also formed during operation of the device by means of the feed device between two adjusting positions in the axial direction.
  • the outlet of the burner accommodated in the immersion tube is arranged vertically spaced from a predetermined level height at which the surface of a molten bath filled into the container is present during operation of the device.
  • the burner is switched on or off.
  • the heating device is also in this setting position.
  • the dip tube dips into the molten bath at least with a lower section, at least so far that the flow opening or the flow openings are located below the surface of the molten bath.
  • the feeding of the heater into the melt is either perpendicular or obliquely from above.
  • the burner Before moving the heating device to the second setting position, the burner must be ignited so that it can flow over the flow opening (s) Escaping flue gases prevent the penetration of liquid metal into the dip tube and direct contact of the liquid metal with the burner. After completion of the heating process, the heater is moved back to the first setting position and then turned off the burner.
  • the burner is firmly mounted in the dip tube and arranged for example along the axis of the dip tube.
  • the preferably cylindrical immersion tube is equipped with one or more flow openings, which is / are arranged in a section which dips into the melt when the device is in use, preferably in the lower end side of the immersion tube.
  • the lower end of the dip tube is fully open.
  • the immersion tube is essentially gas-tight at its upper end side and in the shell section, which is not below the surface of the melt after immersion of the immersion tube.
  • the dip tube has only one passage opening or more passage openings for the burner and / or the supply lines for the fuel and / or the oxidizing agent, wherein the connection between the burner or the supply lines and the walls of the dip tube is also formed at least substantially gas-tight and there is no or negligible little flue gas escape.
  • the container is designed as a transport container for transporting a metallic melt.
  • a transport container for transporting a metallic melt.
  • it is an on a road or rail vehicle permanently mounted or mountable container for transporting liquid metals, such as liquid iron or liquid aluminum.
  • the heater mounted on the container also allows during the transport a continuous temperature control of the melt. Due to the vertical adjustability of the heater while a complete shutdown of the burner is possible.
  • the device 1 for keeping liquid metal for example liquid aluminum
  • the container 2 and lid 3 are each made of a refractory, heat-resistant material or are each lined with a refractory material (not shown here).
  • a recess 6 is provided for a heater 7 described in more detail below.
  • the heating device 7 comprises a burner 10 accommodated in a dip tube 9, for example 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 here in more detail.
  • a feed device 11 which is arranged on the outside of the cover 3 and is not explained here in more detail.
  • the melt 4 is to be maintained at a temperature of, for example, 780 ° C. for the duration of a transport of, for example, 2-4 hours.
  • the burner 10 is a fuel-oxygen burner with a central supply 13 connected to a fuel line 12 for a gaseous or liquid fuel, for example natural gas, one connected to an oxygen line 14, radially outside to the feed for the fuel subsequent oxidizing agent 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 the axis thereof.
  • the fuel line 12 and the oxygen line 14 are connected to sources not shown here for fuel or oxygen.
  • the dip tube 9 is made of a ceramic or non-ceramic material and is formed open at its lower end face 17. Instead of or in addition to Incidentally, one or more openings may also be arranged in a lower section of the dip tube 9, that is, in the intended use below the level 5 of a melt 4, in particular those with which flue gases escaping from the dip tube 9 in the lateral direction be directed into the melt.
  • the length of the dip tube 9 is dimensioned such that in the process upwards with the help of the feeder 11, a position is reached, in which the lower end face 17, but at least the burner 10, is above the level of the level 5 of the melt in the process on the other hand, the dip tube dips deep into the melt 4, and the burner 10 is positioned with its mouth below the level of the level 5.
  • the dip tube 9 is formed largely closed gas-tight and has only passages 21, 22 for the lines 12, 14, in which these in turn are at least largely gas-tight, whereby flue gas not or only in insignificant amounts in this direction can escape the dip tube 9.
  • the crucible 2 is filled to the level of the level 5 with a melt 4 and then the lid 3 is placed with the heater 6 on the crucible 2.
  • the heater 7 is initially still in an upper position in which the lower end face 17 of the dip tube 9, but at least the burner 10, above the level 5 is located.
  • fuel preferably natural gas, and oxygen, preferably oxygen having a purity of at least 95 vol .-%, introduced via the lines 12, 14 and ignited by means of the ignition 16, whereupon the fuel burns to form a flame 19.
  • the resulting flue gases escape completely, or almost completely, over the open end 17 of the dip tube.
  • the heating device 7 is lowered by means of the feed device 11 until a lower portion of the dip tube 9 and in particular the end face 17 is within the melt 4, as in Fig. 1 shown.
  • the pressure of the flue gases produced during combustion the penetration of the melt into the interior of the dip tube 9 is prevented; the flame 19 is thus not or only at its outermost tip with the melt 4 in direct contact. Instead, the fumes are pushing - As indicated by arrows 23 - from the open, lower end face 17 of the dip tube 9 also penetrate into the melt 4 and pearl in the form of gas bubbles 24 upwards. Due to the large number of rising gas bubbles 24 is a large area for heat transfer from the flue gas into the melt 4 available.
  • the ascending gas bubbles 24 lead to a continuous circulation of the melt 4, by means of which the temperature distribution in the melt 4 is homogenized.
  • a heat transfer also takes place on the wall of the dip tube 9. The emerging from the melt 4 flue gases are then removed via a trigger 25 in the lid 3.
  • the probe 27 allows the continuous measurement of the temperature of the melt 4.
  • the control unit is connected to control valves 29, 30 in the lines 12, 14 in data connection.
  • the power of the burner 10 by influencing the supply of fuel and / or oxygen proportionally or stepwise controlled in dependence on the temperature detected at the temperature measuring probe 27 temperature of the melt 4 and used, for example, the temperature of the melt 4 permanently on a to hold predetermined value.
  • an automated heating during transport is possible.
  • the device according to the invention is suitable for maintaining the temperature of various metals, in particular iron or aluminum, up to a temperature of 1000 ° C. Due to the large heat exchange surface of the rising in the melt gas bubbles high efficiency of heating is also ensured, as a good temperature homogeneity in the melt due to the constant, induced by the rising gas bubbles movement. When using a fuel-oxygen burner, it is ensured that the flue gases predominantly consist of CO 2 , H 2 O and O 2 , which do not adversely affect the melt.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Forging (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
EP17162249.1A 2016-03-24 2017-03-22 Procédé et dispositif destinés à conserver au chaud des métaux liquides Active EP3228403B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
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
SI201730316T SI3228403T1 (sl) 2016-03-24 2017-03-22 Postopek in naprava za ohranjanje toplote tekočih kovin
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 true EP3228403A2 (fr) 2017-10-11
EP3228403A3 EP3228403A3 (fr) 2017-11-15
EP3228403B1 EP3228403B1 (fr) 2020-06-03

Family

ID=58401457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17162249.1A Active EP3228403B1 (fr) 2016-03-24 2017-03-22 Procédé et dispositif destinés à conserver au chaud des métaux liquides

Country Status (9)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111604493A (zh) * 2020-06-19 2020-09-01 武汉钢铁有限公司 一种中间包烘烤防护系统及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0217094A1 (fr) 1985-08-22 1987-04-08 Linde Aktiengesellschaft Procédé et dispositif pour maintenir la température d'un bain dans une poche
DE3637065A1 (de) 1986-10-31 1988-05-05 Technometal Ges Fuer Metalltec Pfanne mit beheizungsvorrichtung
EP1078704B1 (fr) 1999-08-27 2005-05-04 JFE Steel Corporation Système de chauffage d'une poche et procédé pour chauffer les poches
WO2006133679A2 (fr) 2005-06-13 2006-12-21 Karl Konzelmann Metallschmelzwerke Gmbh & Co. Kg Procede de reglage de proprietes de fusion predeterminees d'un metal liquide, notamment d'aluminium liquide, systeme de traitement, contenant de transport et vehicule de transport destine au metal liquide
DE102007022684A1 (de) 2006-05-16 2007-11-29 Sms Demag Ag Heizeinrichtung zum Vorwärmen eines Flüssigmetall-Transportbehälters

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
JP5832332B2 (ja) * 2012-02-22 2015-12-16 東邦瓦斯株式会社 溶湯浸漬バーナ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0217094A1 (fr) 1985-08-22 1987-04-08 Linde Aktiengesellschaft Procédé et dispositif pour maintenir la température d'un bain dans une poche
DE3637065A1 (de) 1986-10-31 1988-05-05 Technometal Ges Fuer Metalltec Pfanne mit beheizungsvorrichtung
EP1078704B1 (fr) 1999-08-27 2005-05-04 JFE Steel Corporation Système de chauffage d'une poche et procédé pour chauffer les poches
WO2006133679A2 (fr) 2005-06-13 2006-12-21 Karl Konzelmann Metallschmelzwerke Gmbh & Co. Kg Procede de reglage de proprietes de fusion predeterminees d'un metal liquide, notamment d'aluminium liquide, systeme de traitement, contenant de transport et vehicule de transport destine au metal liquide
DE102007022684A1 (de) 2006-05-16 2007-11-29 Sms Demag Ag Heizeinrichtung zum Vorwärmen eines Flüssigmetall-Transportbehälters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111604493A (zh) * 2020-06-19 2020-09-01 武汉钢铁有限公司 一种中间包烘烤防护系统及方法
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

Also Published As

Publication number Publication date
HUE050839T2 (hu) 2021-01-28
RS60444B1 (sr) 2020-07-31
EP3228403A3 (fr) 2017-11-15
SI3228403T1 (sl) 2020-08-31
HRP20201180T1 (hr) 2020-11-13
PL3228403T3 (pl) 2020-12-14
ES2797928T3 (es) 2020-12-04
DE102016003728A1 (de) 2017-09-28
LT3228403T (lt) 2020-08-25
EP3228403B1 (fr) 2020-06-03

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