EP2459758B1 - Traitement thermique de bande assisté par un caloduc - Google Patents

Traitement thermique de bande assisté par un caloduc Download PDF

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Publication number
EP2459758B1
EP2459758B1 EP10736631.2A EP10736631A EP2459758B1 EP 2459758 B1 EP2459758 B1 EP 2459758B1 EP 10736631 A EP10736631 A EP 10736631A EP 2459758 B1 EP2459758 B1 EP 2459758B1
Authority
EP
European Patent Office
Prior art keywords
strip
roller
processing
heat pipe
heat
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
EP10736631.2A
Other languages
German (de)
English (en)
Other versions
EP2459758A1 (fr
Inventor
Geert Paulussen
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.)
Tata Steel Nederland Technology BV
Original Assignee
Tata Steel Nederland Technology BV
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Filing date
Publication date
Application filed by Tata Steel Nederland Technology BV filed Critical Tata Steel Nederland Technology BV
Priority to EP10736631.2A priority Critical patent/EP2459758B1/fr
Publication of EP2459758A1 publication Critical patent/EP2459758A1/fr
Application granted granted Critical
Publication of EP2459758B1 publication Critical patent/EP2459758B1/fr
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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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • 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
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling

Definitions

  • the invention relates to a method of processing a strip following a strip path by heating or cooling wherein the strip is brought into contact with a roller wherein the roller comprises a heat pipe, wherein the roller simultaneously heats a first strip and cools a second strip.
  • a method may be practised on a steel strip, for example in a strip processing line such as a continuous annealing line.
  • the invention further relates to an apparatus for carrying out said method and the use thereof.
  • An object of the invention is to develop a method and installation that will be much more energy efficient, while delivering similar or better process conditions and controllability. According to the invention extensive heat recovery is feasible.
  • Patent application WO2009/007362 discloses a system where a strip surrenders its heat to the rolls and is thereby cooled. The rolls revolve and surrender their heat to a cold strip the footprint of which largely or fully overlaps that of the hot strip, the strip contacting the roller over the same part of its width corresponding with the footprint-overlap, but at another portion of the roller's circumference.
  • the heat conductive roller with integrated heat pipe used in an arrangement according to WO2009/007362 referred to above has the advantage that it is simple and the strip direction only needs to be reversed on a turn roll.
  • the disadvantages are that the heat is transported mostly by conduction so the smoothening effects for temperature gradients across the strip width is limited.
  • the heat and cool cycle for the roll shell in each revolution will also result in a high fatigue load due to thermal expansion and contraction.
  • the invention provides in fact another type of heat exchanging process for strip in a processing line.
  • the dimensions of the roller and the lay-out of the strip paths are chosen such that the footprint on the roller of the first strip to be heated and the footprint on the roller of the second strip to be cooled, do not overlap.
  • the roller has a width of more than the sum of the width of the hot strip to be cooled down and the width of the cold strip to be heated up so as to enable the roll to simultaneously act with the two strip parts that essentially run side by side.
  • the hot strip surrenders its heat to a roll through the roll shell to a working fluid that is contained in a heat pipe integrated in the roll, causing evaporation of the working fluid in the relevant part of the roller hereinafter named evaporator zone.
  • the working fluid vapour flows to the cooler part of the roller, hereinafter named the condenser section and condenses there.
  • the condensation heat is passed through the roll shell to heat the cold strip that cooperates with the complementary part of the roll.
  • Both the evaporator and condenser sections of the heat pipe are located in a single cylindrical shell part of one and the same roller, so that there necessarily is an offset between the strips.
  • the heat pipe extends essentiality along the axial length of the roller having a length of more than the sum of a first strip width to be heated and a second strip width to be cooled.
  • the strip to be heated and the strip to be cooled may be part of the same uncut strip, in which case the line arrangement will have to be such that the strip is turned and led so as to be running side by side with itself at the roller in question.
  • a continuous annealing line the heat that is continuously extracted in the cooling section of a continuous annealing line is re-used to heat the strip up to soaking temperature, see also Figure 1 . If a process according to the invention is put into practice, the design of such an installation will have to be adapted by having the cooling section and the heating section of such a line in adjacent locations.
  • the advantage of operating according to the invention is that the heat is transported in near steady state, which drastically reduces the fatigue load on the heat pipe shell.
  • temperature gradients across the strip width will not be transferred to the reverse side, because of the separation of heating and cooling sections of the cylinders.
  • Strip reversal and/or offset can be realised using gas cushion or roller offset sections.
  • the strip In conventional furnaces the strip is heated up by heating up the furnace to temperatures well above the desired strip temperature.
  • the high temperature difference between furnace and strip is the force in driving the heat into the strip at an acceptable rate.
  • the furnace refractory and radiant tubes have a large heat content compared to the strip, changes in line speed will immediately lead to a changed strip temperature.
  • the conventional line must preferably be kept at a constant speed. This is established by implementing looper towers at the entry and exit, so that the line speed at entry and exit can be varied without changing the line speed inside the furnace. This flexibility in line speed at entry and exit is required to weld together coils at the entry, creating a continuous strip, and separating them again at the exit.
  • the heat densities that can be achieved with heat pipes are substantially higher than in conventional lines.
  • the exposed strip lengths to heat up and cool down the strip can therefore be much smaller than in conventional furnaces allowing again an installation that can be more compact resulting in lower capital expenditure and operating cost.
  • the strip In continuous heat treatment installations for strip, the strip is paid off at the start of the line, heated, soaked, cooled, over-aged and recoiled at the end of the line.
  • the current state of the art in this type of heat treatment is that the strip is heated using one or more gas fired furnaces with possibly additional capacity installed in an inductive heating section.
  • the strip is maintained at a high temperature for a limited time to anneal, after which the strip is cooled using a convective cooling system with protective gas and possibly a final cooling in the form of a quench.
  • the present invention is ideally suited to be applied in such an installation.
  • the invention enables transport of heat with an apparent conductivity greater than copper, the most efficient industrial conductor material applied today, provides an installation that will be much more energy efficient, while delivering similar or better process conditions and controllability.
  • roller 1 and roller 11 are complementary parts of one and the same roller 1, 11 comprising one shared heat pipe. The same applies to the roller parts 2 12, 3 13, 4 14, 5 15 and 6 16 respectively.
  • the strip passes roller 2 at 510 °C and roller 3 at 420 °C. Then the strip is subjected to over-aging at roller 7 at 420 °C, cooled and passed on to roller 4 at 330 °C.
  • roller halves 16, 15, 14, 13, 12 and 11 are to be regarded as heat pipe condenser sections that heat the strip from 150°C to 600 °C and the roller halves 1, 2, 3, 4, 5 and 6 as heat pipe evaporator sections that cool the strip down from 600 °C to 150 °C.
  • the complete temperature cycle for strip, nickel plated strip and tin plate processing can be achieved with a minimum of four working fluids, namely water, mercury, sodium and Thermex ®, wherein Thermex ® comprises a mixture of propylene glycol, dipotassium phosphate and deionised water.
  • Another working fluid that can be used is Dowtherm A ®, which is a diphenyl oxide/biphenyl blend.
  • the working temperature for these four media ranges from 30°C up to 1200°C (Table 1). This is more than sufficient for processing low carbon steel up to and beyond normalization temperature and for annealing and normalising a nickel plated strip, having a normalisation temperature of up to 1050°C.
  • Caesium or potassium can be added as working fluids to keep normal operation pressures limited.
  • Table 1 Heat pipe media for 30-1200°C range. Medium Melting point Boiling point (atmospheric) Useful range [°C] [°C] [°C] Water 0 100 30 200 Thermex ® 12 257 150 350 Mercury -39 361 250 650 Sodium 98 892 600 1200 To prevent the deterioration of the working liquid over time due to reaction with a heat pipe container material or contaminants present on an inner surface of the container material, it is preferred to use stainless steel container materials in the presence of Thermex ®, mercury and sodium, whereas in the presence of water, mild steel or copper container materials are preferred.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (8)

  1. Procédé de traitement d'une bande en suivant un trajet de bande par chauffe ou refroidissement, dans lequel la bande est amenée en contact avec un rouleau dans lequel le rouleau comporte un caloduc, dans lequel le rouleau chauffe une première bande tout en refroidissant simultanément une seconde bande, caractérisé en ce que les dimensions du rouleau et le tracé des trajets de bande sont choisis de telle manière que l'empreinte de la première bande sur le rouleau et l'empreinte de la seconde bande sur le rouleau ne se chevauchent pas.
  2. Procédé de traitement d'une bande selon la revendication 1, dans lequel la première bande et la seconde bande font partie de la même bande non coupée.
  3. Procédé de traitement d'une bande selon la revendication 1 ou 2, dans lequel la bande est traitée sur une ligne de recuit continu.
  4. Procédé de traitement d'une bande selon l'une quelconque des revendications précédentes, dans lequel la première bande est chauffée à une température dans la fourchette de 150° C à 1050° C, de préférence dans la fourchette de 150° C à 600° C.
  5. Procédé de traitement d'une bande selon l'une quelconque des revendications précédentes, dans lequel la seconde bande est refroidie à une température dans la fourchette de 1050° C à 150° C, de préférence dans la fourchette de 600° C à 150° C.
  6. Procédé de traitement d'une bande selon l'une quelconque des revendications précédentes, dans lequel la bande est une bande d'acier, une bande nickelée ou une tôle de fer blanc.
  7. Dispositif de traitement d'une bande, qui comporte un rouleau et un caloduc intégré, le caloduc comportant un fluide de travail, une section d'évaporation destinée à l'évaporation du fluide de travail et une section de condensation destinée à la condensation du fluide de travail évaporé, dans lequel le caloduc s'étend essentiellement le long de la longueur axiale du rouleau ayant une longueur supérieure à la somme de la largeur d'une première bande devant être chauffée et de la largeur d'une seconde bande devant être refroidie.
  8. Utilisation du dispositif de traitement d'une bande selon la revendication 7 sur une ligne de recuit continu.
EP10736631.2A 2009-07-27 2010-07-22 Traitement thermique de bande assisté par un caloduc Active EP2459758B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10736631.2A EP2459758B1 (fr) 2009-07-27 2010-07-22 Traitement thermique de bande assisté par un caloduc

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP09009688 2009-07-27
EP10736631.2A EP2459758B1 (fr) 2009-07-27 2010-07-22 Traitement thermique de bande assisté par un caloduc
PCT/EP2010/004485 WO2011012257A1 (fr) 2009-07-27 2010-07-22 Traitement thermique de bande assisté par un caloduc

Publications (2)

Publication Number Publication Date
EP2459758A1 EP2459758A1 (fr) 2012-06-06
EP2459758B1 true EP2459758B1 (fr) 2016-09-14

Family

ID=43332558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10736631.2A Active EP2459758B1 (fr) 2009-07-27 2010-07-22 Traitement thermique de bande assisté par un caloduc

Country Status (4)

Country Link
EP (1) EP2459758B1 (fr)
HU (1) HUE031656T2 (fr)
PL (1) PL2459758T3 (fr)
WO (1) WO2011012257A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57164932A (en) * 1981-04-01 1982-10-09 Mitsubishi Heavy Ind Ltd Method for making temperature of roll for heat treatment device of metallic strip uniform and said roll
US4627907A (en) 1984-11-02 1986-12-09 General Electric Company Long life portable oxygen sensor with high stability
BE1017683A3 (fr) 2007-07-12 2009-03-03 Drever Internat Sa Procede, dispositif et systeme de traitement thermique d'une bande metallique en defilement.

Also Published As

Publication number Publication date
EP2459758A1 (fr) 2012-06-06
PL2459758T3 (pl) 2017-02-28
WO2011012257A1 (fr) 2011-02-03
HUE031656T2 (hu) 2017-07-28

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