WO2010079452A1 - Procede et section de refroidissement d'une bande metallique en defilement par projection d'un liquide - Google Patents
Procede et section de refroidissement d'une bande metallique en defilement par projection d'un liquide Download PDFInfo
- Publication number
- WO2010079452A1 WO2010079452A1 PCT/IB2010/050049 IB2010050049W WO2010079452A1 WO 2010079452 A1 WO2010079452 A1 WO 2010079452A1 IB 2010050049 W IB2010050049 W IB 2010050049W WO 2010079452 A1 WO2010079452 A1 WO 2010079452A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cooling
- temperature
- strip
- liquid
- coolant
- Prior art date
Links
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
-
- 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
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- 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
-
- 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
Definitions
- the present invention relates to improvements made to the cooling sections of the continuous treatment lines of metal strips, in particular annealing, galvanizing or tinplate.
- a line of continuous treatment of metal strips is composed of a succession of heat treatment sections, including heating, temperature maintenance, cooling, aging, etc.
- the present invention relates to the cooling sections of the continuous treatment lines and more particularly the rapid cooling sections with projection of a liquid on the strip.
- the coolant is usually water, can be pretreated, for example to extract dissolved oxygen or minerals, which may contain additives to improve the thermal exchange or limit oxidation of the strip.
- Water cooling allows to obtain very large cooling slopes, beyond those that can be obtained with gas cooling.
- the cooling of the strip can also be obtained by the projection on the strip of a mixture consisting of a gas and a liquid.
- the gas is generally present as a carrier gas for spraying and spraying the liquid on the strip.
- the gas used is most often nitrogen but may also be composed of a mixture of nitrogen and hydrogen, or any other gas.
- the liquid can be sprayed in the form of a mist or sprayed with larger drops or in the form of a continuous liquid.
- the cooling of the strip can begin while it is at a high temperature, for example 750oC.
- the boiling temperature is close to 100oC. It can vary by a few degrees depending on the composition of the water and its content of additives.
- the temperature of the water spray is then a first order parameter for the control of the cooling intensity, - Water oC).
- - Water oC Regarding the phenomenon of calefaction, i!
- This critical temperature depends on many parameters, including characteristics of the spray, the temperature or liquid sprayed, or the nature and temperature of the cooled surface.
- the effect on this temperature of the coolant temperature and the spray parameters such as the speed and the diameter of the drops is mainly considered.
- the object of the invention is, above all, to ensure a homogeneous cooling of the metal strip, in particular to prevent the formation of folds or significant differences in mechanical characteristics along the width and / or the length.
- a method of controlling the cooling of a metal strip moving in a cooling section of a continuous treatment line by projection on the strip of a liquid or a mixture consisting of a gas and a a liquid, the parameter-dependent cooling comprising the temperature, the velocity, the characteristics of the cooling fluid stream, is characterized in that:
- one or more zones in which the cooling parameters is determined are as might occur, or occurs, the local disappearance of a vapor film on the surface of ia hot strip, causing rewetting of the web,
- the invention is thus first and foremost a method for controlling or cooling a metal strip moving in a continuous treatment line by spraying a liquid or a mixture consisting of a gas and a mixture on the strip.
- a liquid so as to maintain a so-called "vapor film” cooling at the surface of the strip resulting from the phenomenon of heating of the cooling liquid in contact with a hot band, of increasing the temperature of the coolant in the zone or rewetting, where this occurs, resulting from the local disappearance of the vapor film, so as to remain or return to a vapor film cooling at the surface of the strip.
- another adjusted cooling parameter is constituted by a sputtering parameter formed by the speed and / or the diameter of the drops of coolant in the zone or zones concerned.
- the temperature of the coolant can be adjusted so that it is different between two successive cooling units of the cooling system. the cooling section.
- a combined adjustment of the temperature and the flow rate of the coolant can be made to allow the thermal flux extracted from the band to be modulated.
- the coolant temperature can be adjusted to the width of the strip.
- Several coolant spraying units may be distributed along the width of the strip, and the temperature and flow rate of the coolant for each spraying unit is adjusted over the width of the strip.
- the temperature or liquid can be adjusted at the beginning of cooling so as to limit the variation of the temperature gradient resulting from the cooling with respect to the heating or from the maintenance of the previous temperature.
- the temperature of the liquid may be adjusted according to the intended cooling capacity so as to limit the variations in the flow rate of the coolant.
- the zone in which it occurs determines the occurrence of a sharp increase in the transverse temperature gradient of the strip and a clean break of cooling slope resulting from greater cooling in the absence of vapor film, in using the strip temperature measuring devices in areas where rewetting is likely to occur.
- tests are in an area on the staple length of the metal strip when the strip temperature is between 45CTC and 250oC 1 and at several points along the width of the tape so to detect large variations in temperature.
- the invention also relates to a cooling section of a continuous processing line for the implementation of the method defined above, which section includes projection units on a metal strip of a liquid or a mixture consisting of a gas and a liquid, and is characterized in that it comprises, for at least one coolant projection unit on the tape, a cooling liquid supply assembly comprising two separate circuits each of which is equipped with a regulating valve and connects to the same outlet pipe a volume flow of the mixture being provided for the sieve pipe and a mixing temperature controller.
- the supply assembly may comprise a regulator for adjusting the proportion of cold and hot water flow rates so as to obtain the desired overall liquid flow rate at the desired temperature for each projection device.
- the temperature of the stiffening liquid can be adjusted according to the desired heat flow and as a function of the temperature of the strip.
- the invention With warmer water at the end of cooling (for example 35 ° C. at the beginning of the cooling and 80 ° C. at the end of cooling), the invention makes it possible to maintain control over the cooling by staying longer in 20 ml of steam.
- the water temperature when combined with an adjustment of the water flow over the band width, makes it possible to obtain a uniform strip temperature over its width.
- the determination of the temperature of Lindonfrost is very difficult because many parameters affect it.
- the spray molds are very important.
- the proportion and temperature of the sputtering gas affect the Lindenfrost temperature.
- the strip also influences the temperature, the roughness of the surface, the temperature of the heat exchange between the strip.
- determining Lindonfrost's temperature will actually depend on how fast the drop of liquid will reach its vaporization temperature. More glue will be faster and Lindenfrost's temperatute will be reduced.
- the large number of parameters influencing the rewetting of the band is that it occurs that it occurs in normal production of the line in an area where it was not expected.
- the temperature of the coolant is increased by the operator in the area of interest so as to repel the rewetting in the next zone.
- the operator may also anticipate increasing the temperature of the cooling water in the following zone (s) to repel the beginning of rewetting.
- the temperature rise to be applied will have been defined beforehand during commissioning tests, for example 5oC. It can also be adjusted by the operator.
- Increasing the coolant temperature in one zone may be accompanied by further adjustment of the sputtering parameters so as to maintain the target temperature slope on the belt without reducing the speed of the line.
- the flow of cooling water may be increased in this area.
- the increase of the water flow can be carried out automatically by the control and control system of the line so as to reach the band temperature setpoint at the outlet of the cooling zone.
- the optimum settings have been defined. during the commissioning of the line or by self-learning during the operation of the line.
- the foregoing description of the invention corresponds to the adjustment of the coolant temperature to remain in the vapor film mode. Another way to achieve this result, at constant liquid temperature, is to change the size of the drops and the speed at which they arrive on the tape.
- adjustment of the speed and the droplet diameter may be achieved by a mechanical change of the nozzle at the liquid spray orifice.
- the temperature of the coolant and the spray parameters such as the speed and diameter of the drops in the area where rewetting could occur, or where it occurs, resulting the local disappearance of the vapor film so as to remain or return to a vapor film cooling at the surface of the strip.
- FIG. 1 is a diagram of a configuration according to the invention for supplying a cooling liquid projection unit.
- FIG.2 is a perspective diagram in elevation of a cooling section according to the invention.
- FIG. 3 is a diagram, similar to FIG. 2, of an alternative embodiment with fractional cooling units according to the bandwidth,
- Fig.4 is a diagram, similar to Fig.3 .. of an alternative embodiment with fractional cooling units according to the width and the strip length,
- Fig.5 is a schematic vertical section of an example of a cooling section.
- Fig.1 is a diagram of an exemplary embodiment dxin A set of coolant supply according to the invention for a unit Di ... DIi! (Fig.2) liquid projection on a band B. scrolling vertically down, to cool.
- Each unit Dl ... DIII is associated with a set A.
- Set A provides flow and temperature control of the cooling water.
- the configuration of A comprises two separate circuits supplying cold water 1 and hot water 2, each equipped with a control valve respectively CV1 CV2, and connected to the same outlet pipe 3.
- a CD flow controller of the mixture is provided on the pipe 3 and a TE temperature controller of the mixture.
- a regulator R makes it possible to adjust the proportion of the flow rates of cold water and hot water so as to obtain the desired overall flow rate of liquid at the desired temperature for each projection unit, also called a cooling unit.
- D1, DII, DIII (Fig.2).
- each cooling unit the drops of liquid sprayed by each cooling unit are represented as a whole in a prismatic sheet whose base is located on the strip 8, while the opposite edge corresponds to the liquid outlet nozzles. of the cooling unit.
- a control of the temperature of the water spray and / or a control of the spray parameters according to the invention are additional means for controlling the flow of water spray. These means bring more flexibility and greater homogeneity of the cooling.
- the temperature of the coolant and / or the sputtering parameters are adjusted so that they are different between two successive cooling units D1.
- DIL DIlI FIG. 2 in the direction of travel of the strip, the device according to the invention makes it possible to control the temperature of the sprayed water and / or the spray parameters along the length of the cooling section by a fractionation along the length in zones I, II III (Fig.2) of cooling.
- a cooling unit is provided on each side of the band, respectively Dl, DI, ... DIII, D'III.
- Each cooling unit has a liquid temperature regulating member and / or the ejector nozzle separate from that of the other zones.
- the device according to the invention also makes it possible to control the temperature of the water sprayed over the width of the cooling section by a fractionation, illustrated in FIG. 3, on the width in fractional cooling units DIa, DIb, ... DIe , each having a liquid temperature adjusting member separate from that of the other zones
- the temperature adjusting member constituting the assembly A. is a hot water mixer - cold water fed with a hot water network and a cold water network. Depending on the temperature setpoint, the mixer adjusts the proportion of cold and hot water flow rates.
- the temperature adjusting member is a heat exchanger between the coolant and another fluid, for example air or water.
- Fig.3 is a diagram to: an exemplary embodiment of the invention this cross-regulation of the coolant temperature with 5 separate cooling units on the bandwidth.
- the invention also relates to a cooling method so that the cooling curve is that referred to at each point of the width of the strip along the cooling section.
- Adjusting the water temperature also helps to limit the risk of cool buckling at the beginning of cooling. This risk can result from a major break in the road the heat of the band during the passage of the heating section, or the temperature holding section, to its cooling section.
- Patent FR 2802552 (or US Pat. No. 6464808) describes this problem in more detail.
- the invention makes it possible to limit the initial cooling of the strip and thus limits the risk of fold formation (cooi buckle) due to the fact that a slight slope break.
- the invention is thus also relates to a method for controlling the read cooling a metal strip clans a continuous processing line for projection on the strip with a liquid or a mixture of a gas and a liquid with a temperature of the liquid adjusted at the beginning of cooling so as to limit the variation of the temperature gradient resulting from the cooling with respect to the previous heating or holding.
- the combined adjustment of the temperature and the flow rate of the coolant makes it possible to modulate the thermal flux extracted from the strip.
- the temperature and the flow rate of the cooling liquid are adjusted over the width and the length of the strip, so as to increase the flexibility of the installation while benefiting from greater range of adjustment of the cooling speed of the band.
- the cooling units are divided according to the width ⁇ indices in letters a .... e) and according to the length (indices in Roman numerals I, II, III) in elementary units DIa 1 ... DIIIe.
- the temperature profile control over the width of the strip resulting from the adjustment of the cooling capacity over the band width makes it possible to improve the guiding of the strip on the transport rollers by the width of the strip. obtaining long or short banks with respect to the center of the strip.
- Controlling the temperature profile over the width of the strip resulting from the adjustment of the cooling capacity to the bandwidth improves the flatness of the strip by controlling the length of the banks with respect to the center of the strip. .
- Controlling the temperature profile over the bandwidth resulting from the adjustment of the cooling capacity to the bandwidth improves the stability of the band by controlling the length of the banks relative to the center of the band. bandaged.
- the adjustment of the cooling capacity over the length of the cooling section and the width of the strip is realized in real time by a control and control system (not shown) of the line by means of : calculator from mathematical models taking into account the evolution of thermal exchanges between the band and its environment in the cooling section and in the section located downstream thereof.
- the computer controls the CVI control valves. CV2 of the different sets A.
- the present invention also consists in a splitting into a plurality of cooling units in the device width direction and in the direction of! A length of the strip, shown in Fig.4.
- Each unit is equipped with the necessary equipment to vary the coolant temperature and coolant, and / or the spraying parameters, independently of the other units.
- the size of the cooling units D1 ... DIII may be different along the cooling section with a smaller size in the portion of the cooling section where the caifaction phenomenon may become unstable so as to better control the phenomenon.
- the length of the cooling units may be smaller in the running direction of the strip.
- the width of the cooling units can also be reduced in the bandwidth direction.
- each unit may be equipped with two control members for varying the gas flow rate and the flow rate of the liquid.
- Each unit may also be equipped with a device for varying the temperature of the gas, liquid or mixture of the gas and the liquid so as to influence the heating phenomenon and to vary the cooling capacity.
- This variation of the temperature of the cooling means can be carried out for a constant flow rate of the cooling means or combined with a variation of the flow rate of the cooling means, so as to increase the flexibility of regulation of the installation.
- the production capacity of a continuous line varies in important proportions according to the format of the band, in particular its thickness, and. according to the thermal cycle.
- the projected water flow will be very variable which makes its control difficult for large and small flows due to the limited flexibility of flow control devices.
- the invention also consists in varying the temperature of the cooling liquid so as to limit the amplitude of variation of the water flow.
- the invention thus also relates to a method for controlling the cooling of a moving metal strip in a continuous treatment line by projection on the strip of a liquid or a mixture consisting of a gas and a liquid with a liquid temperature adjusted according to the cooling capacity aimed so as to limit the variations in the flow rate of the coolant.
- FIG. 5 An exemplary embodiment, shown diagrammatically in FIG. 5 and reproduced below, shows the temperature variations of the cooling water according to the invention:
- the metal strip is at 750oC and the water spray is at 8OoC so as to limit the risk of formation of folds on the band (cool buckle),
- the water temperature is reduced to 40 ° C to quickly reach the required strip temperature (60 ° C) at the end cooling.
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- 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)
- Control Of Heat Treatment Processes (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/143,007 US8918199B2 (en) | 2009-01-09 | 2010-01-07 | Method and section for cooling a moving metal belt by spraying liquid |
CN201080004262.5A CN102272338B (zh) | 2009-01-09 | 2010-01-07 | 通过喷射液体对行进中的金属带进行冷却的方法和冷却段 |
PL10702917T PL2376662T3 (pl) | 2009-01-09 | 2010-01-07 | Sposób i sekcja schładzania poruszającej się taśmy metalowej poprzez natryskiwanie cieczy |
JP2011544956A JP2012514694A (ja) | 2009-01-09 | 2010-01-07 | 液体を噴霧することによる、移動する金属ベルトを冷却する方法及びセクション |
RU2011133250/02A RU2541233C2 (ru) | 2009-01-09 | 2010-01-07 | Способ и секция охлаждения движущейся металлической полосы посредством распыления жидкости |
ES10702917T ES2881292T3 (es) | 2009-01-09 | 2010-01-07 | Método y sección para enfriar una banda metálica en movimiento mediante pulverización de líquido |
EP10702917.5A EP2376662B1 (fr) | 2009-01-09 | 2010-01-07 | Procédé et section de refroidissement d'une bande métallique en défilement par projection d'un liquide |
BRPI1006107-0A BRPI1006107B1 (pt) | 2009-01-09 | 2010-01-07 | processo de controle do resfriamento de uma tira metálica, e, seção de resfriamento de uma linha de tratamento em modo contínuo para a execução do processo |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0900077A FR2940978B1 (fr) | 2009-01-09 | 2009-01-09 | Procede et section de refroidissement d'une bande metallique en defilement par projection d'un liquide |
FR0900077 | 2009-01-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010079452A1 true WO2010079452A1 (fr) | 2010-07-15 |
Family
ID=41090379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2010/050049 WO2010079452A1 (fr) | 2009-01-09 | 2010-01-07 | Procede et section de refroidissement d'une bande metallique en defilement par projection d'un liquide |
Country Status (12)
Country | Link |
---|---|
US (1) | US8918199B2 (fr) |
EP (1) | EP2376662B1 (fr) |
JP (2) | JP2012514694A (fr) |
KR (1) | KR20110114624A (fr) |
CN (1) | CN102272338B (fr) |
BR (1) | BRPI1006107B1 (fr) |
ES (1) | ES2881292T3 (fr) |
FR (1) | FR2940978B1 (fr) |
PL (1) | PL2376662T3 (fr) |
PT (1) | PT2376662T (fr) |
RU (1) | RU2541233C2 (fr) |
WO (1) | WO2010079452A1 (fr) |
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US10041140B2 (en) | 2013-12-05 | 2018-08-07 | Fives Stein | Method for continuous thermal treatment of a steel strip |
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- 2010-01-07 RU RU2011133250/02A patent/RU2541233C2/ru active
- 2010-01-07 CN CN201080004262.5A patent/CN102272338B/zh not_active Expired - Fee Related
- 2010-01-07 PL PL10702917T patent/PL2376662T3/pl unknown
- 2010-01-07 EP EP10702917.5A patent/EP2376662B1/fr active Active
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- 2010-01-07 JP JP2011544956A patent/JP2012514694A/ja active Pending
- 2010-01-07 ES ES10702917T patent/ES2881292T3/es active Active
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- 2010-01-07 WO PCT/IB2010/050049 patent/WO2010079452A1/fr active Application Filing
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Cited By (8)
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CN103740904A (zh) * | 2009-12-11 | 2014-04-23 | 株式会社Ihi | 喷雾冷却装置、热处理装置以及喷雾冷却方法 |
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US9187795B2 (en) | 2009-12-11 | 2015-11-17 | Ihi Corporation | Mist cooling apparatus, heat treatment apparatus, and mist cooling method |
CN103740904B (zh) * | 2009-12-11 | 2016-08-24 | 株式会社Ihi | 喷雾冷却装置、热处理装置以及喷雾冷却方法 |
US10041140B2 (en) | 2013-12-05 | 2018-08-07 | Fives Stein | Method for continuous thermal treatment of a steel strip |
US11193181B2 (en) | 2013-12-05 | 2021-12-07 | Fives Stein | Method and apparatus for continuous thermal treatment of a steel strip |
WO2019002408A1 (fr) | 2017-06-28 | 2019-01-03 | Arcelormittal Bissen & Bettembourg | Dispositif de refroidissement de fils galvanisés |
LU100329B1 (fr) * | 2017-06-28 | 2019-01-08 | Arcelormittal Bissen & Bettembourg | Dispositif de refroidissement de fils galvanisés |
Also Published As
Publication number | Publication date |
---|---|
PT2376662T (pt) | 2021-07-26 |
BRPI1006107A2 (pt) | 2020-08-18 |
BRPI1006107B1 (pt) | 2021-02-23 |
PL2376662T3 (pl) | 2021-11-08 |
CN102272338A (zh) | 2011-12-07 |
FR2940978A1 (fr) | 2010-07-16 |
FR2940978B1 (fr) | 2011-11-11 |
JP2012514694A (ja) | 2012-06-28 |
JP2015083719A (ja) | 2015-04-30 |
US20110270433A1 (en) | 2011-11-03 |
KR20110114624A (ko) | 2011-10-19 |
ES2881292T3 (es) | 2021-11-29 |
US8918199B2 (en) | 2014-12-23 |
RU2541233C2 (ru) | 2015-02-10 |
RU2011133250A (ru) | 2013-02-20 |
CN102272338B (zh) | 2014-09-03 |
EP2376662A1 (fr) | 2011-10-19 |
EP2376662B1 (fr) | 2021-04-28 |
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