CN103025898B - Annealing installation with m-shaped strip treatment tunnel - Google Patents
Annealing installation with m-shaped strip treatment tunnel Download PDFInfo
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- CN103025898B CN103025898B CN201180029333.1A CN201180029333A CN103025898B CN 103025898 B CN103025898 B CN 103025898B CN 201180029333 A CN201180029333 A CN 201180029333A CN 103025898 B CN103025898 B CN 103025898B
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- 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
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
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- 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
-
- 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
- C21D9/562—Details
- C21D9/565—Sealing arrangements
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- 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
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- 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
- F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
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- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
Abstract
An annealing installation for the continuous annealing of metal strip guided through the installation, comprising an entrance chute 2, a first top roller chamber 3, a heating station 4, 5, 6, a cooling station 7, 8, a second top roller chamber 9 and a discharge chute 10 together delimiting an M-shaped meandering tunnel with four legs connected with each other via the two top roller chambers and a lower turning section. The entrance chute extends along the first one of the legs, the heating and the cooling stations extend along the second one of the legs, the lower turning section and the third one of the legs, and the discharge chute extends along the fourth one of the legs. Strip feeding and discharging means are provided for continuously guiding the strip as a free-hanging loop between the two top roller chambers through the heating and cooling stations during a process of annealing.
Description
Technical field
The present invention relates to a kind of annealing device of the continuous annealing for sheet metal strip, described sheet metal strip is guided through described equipment.By welding or otherwise the band that supply in roll form is connected, and rewinding after a while, make sheet metal strip continuous at processing section.
Background technology
The so-called clean annealing of the annealing of known metal band, especially cold rolled metal strip (such as, stainless strip) carries out in the continuous annealing process with heating and cooling station, wherein protects band with hydrogeneous shielding gas.For BA (clean annealing) quality stainless strip, this technique is carried out usually in the stove be vertically oriented.Then, guide band with constant speed through vertical stove, only guide band above roller in the top side of stove and/or bottom side simultaneously.Band is so contactlessly guided to be the strip surface in order to prevent from damaging at annealing stage heat through stove.
Stove for the clean annealing of such as stainless strip is filled with shielding gas as protective atmosphere (protective medium), and it comprises the H2 of 70-100vol% usually, remaining as N2, or is filled with dew point once in a while lower than the argon of-40 degrees Celsius.Need shielding gas to be to disperse air, otherwise air can cause oxidation and the variable color of the sheet metal strip of furnace interior process.But this shielding gas very easily explodes, therefore need the measure of extremely safe.In addition, busbar bright annealing technology needs the atmosphere of extremely low dew point, therefore needs extremely airtight stove, dew point conditions also can be made to be deteriorated, and then cause oxidation and the variable color of strip surface because even permeate a small amount of air.
In order to these safety and technological reason, all existing vertical bright annealing ovens are inverted u-shaped, and the open end of U-shaped is in bottom it, and the lower outer end place of the leg at the bottom place of inversion U is with special sealing member.The example of the continuous heat treatment circuit of the sheet metal strip of such inverted U is disclosed in US2009/158975.In the past more than 50 year; namely; from later stage the 1950's vertical bright annealing oven is designed first till now, each vertical bright annealing oven all has this inverted U-shape shape, to guarantee that dangerously explosive shielding gas is upwards locked in the inverted U-shape shaped interior of stove.Even if one of sealing member of band entrance and exit breaks down or damages, because shielding gas weight ratio ambient air is light, shielding gas will be trapped in the inside of inverted U-shape shape.This be it is to be noted, even without such fault, the sealing member of band entrance and exit also needs temporarily to open the very short time period (usually about 10 seconds) sometimes during being transported to the process of the thickening weld seam in the strip material in equipment, and this mainly damages sealing member to prevent.According to productivity, the weld seam between strip coil usually according to
1/
2the interval of-2 hours occurs.In addition, need to carry out timing when the excessive disalignment of band, also may need temporarily to open sealing member.Temporarily open period at such, also need shielding gas naturally to stay device interior, and prevent air access arrangement.
The example such as visible EP 0 914 481 of bright annealing equipment.This equipment comprises inverted U-shape band process tunnel, and two vertical legs are connected to each other via apex roller room (rolling room).Leg in vertical sensing, namely passes its leg directed in upward direction at During Annealing band, is formed, be provided with pre-heat station at an upper portion thereof by the entrance chute of covering.Leg under vertical sensing, namely passes it along directed leg in downward direction at During Annealing band, has retort furnace (muffle) type heating station at an upper portion thereof, have cooling station in its underpart.Entrance chute, retort furnace type heating station and cooling station are connected to each other substantially airtightly.The lower end of entrance chute and the lower end of cooling station form band entrance and band outlet respectively, and they are provided with shielding gas closure member.For such equipment, at During Annealing, band mainly with downward band throughput direction by heating and cooling.
The visible EP 0 675 208 of another example of bright annealing equipment.This equipment also comprises inverted U-shape band process tunnel, and two legs are connected to each other via apex roller room.Leg in vertical sensing is formed by retort furnace type heating station in its underpart now, and middle part is refractory materials type heating station, and top is cooling station.Leg under vertical sensing forms the discharge chute of shielding.Equally, retort furnace and refractory materials type heating station, cooling station and discharge chute are connected to each other substantially airtightly, and the lower end of retort furnace type heating station and discharge chute forms band entrance and exit, and they are provided with shielding gas closure member.At During Annealing, band completely with upwards band throughput direction by heating and cooling.
In two examples, identical leg, in cooling station, utilize forced gas circulating cooling (so-called injection cooling) from heating station out band downwards.Heating station and cooling station are all filled with shielding gas.Band is cooled to enough low temperature, annealing band can be exposed to air, and variable color or other damages of strip surface can not be caused due to ingress of air.
In two examples, band entrance and exit needs gas confinement part, and such as rubber-coated roller or high strength fibre (fibre stroke), to minimize or substantially to prevent the loss of hydrogeneous shielding gas.This is extremely important, because can set off an explosion containing any leakage of H2 shielding gas immediately or catch fire, thus causes danger situation.In addition, gas confinement part can keep heating station to be in enough pressures excessively, in case stopping leak leak source enters air at During Annealing.
The shortcoming of two examples is, its maximum building height is limited, and therefore throughput is also limited.The feature of two kinds of equipment is, main heating and cooling behavior is carried out in the same leg up or down of equipment.This leg of equipment is built get Tai Gao can be caused in this leg, being certainly resuspended in below its hottest point of a certain amount of band, thus causes high tensile in the band of heat.This is especially a problem in EP 0 675 208, because band is on the top of heating station, i.e. the first half of leg, reaches its hottest point, therefore this hottest point has to carry the deadweight of many bands, adds any additional tape tension force in order to make band correctly advance and guide and may need.For the retort furnace type heating station of EP 0 675 208, such building height restriction is also suitable for, but because the deadweight of hot retort furnace material hangs down from the focus of its top retort furnace, will the maximum a certain height of allowing thermal stresses exceeding retort furnace be in from the maximum height of retort furnace.
Another shortcoming of two examples is, any particle fallen during annealing process may be trapped in entrance or exit gas closure member, and this may cause the damage to the strip surface having to pass through closure member.For refractory materials type heating station, the brick dust that these particles may be peeled off by the insulating brick from heating station or brick particle shape become.During heating, the severe thermal that these insulating bricks stand to be caused by the intense radiant heat of an electric heating element be closely arranged on before insulating brick expands and shrinks.Such as, if need the temperature reaching 1200C in heating station, then an electric heating element itself can reach the temperature of about 1700C.Drop in gas confinement part the brick dust peeled off from insulating brick or the final meeting of brick grain.For retort furnace type heating station, these particles may by be attached in comparatively early stage on muffle wall or other internalies and its some time to peel off and the particle dropped in closure member is formed.These particles resident in early days may be formed by common grit, or are formed by the component of strip material, and it, comparatively early the stage is evaporated from strip material at During Annealing, then distils at the comparatively cold surface part place of heating or cooling station.
Summary of the invention
The present invention is intended to overcome one or more above-mentioned shortcoming and/or provide available alternative.Specifically, the present invention aim to provide a kind of effectively and the annealing device of safety operation, high productive capacity, high annealing quality and/or lower production cost can be realized by this annealing device.More particularly, main purpose of the present invention is the stove for clean annealing providing a kind of brand new class, its throughput is significantly higher than attainable throughput in the vertical stove of the inverted u-shaped design of prior art, and improves the security of this kind equipment by reducing risk of explosion.
This purpose is realized by annealing device according to claim 1.Described annealing device comprises entrance chute, the heating station with heating unit, the cooling station with refrigerating unit and discharges chute.Described entrance chute, heating station, cooling station and discharge chute set gradually, and are substantially connected to each other airtightly.They limit the substantially airtight band process tunnel that M shape is longitudinally wriggled together; described band process tunnel is filled with shielding gas; and there are four legs vertically pointed to, described leg utilizes the first apex roller room, the downside section of turning to and the second apex roller room to be connected to each other.Each apex roller room has at least one roller, guides to another leg for by band from the leg be arranged at below it.Described tunnel has band entrance and band outlet at the lower end of entrance chute and discharge chute, and described band entrance and band outlet are provided with shielding gas closure member.Entrance chute extends along first leg.Heating station and cooling station along second leg, and extend along the downside section of turning to along the 3rd leg.Discharge chute to extend along the 4th leg.Band feeding unit and belt discharger being set, guiding continuously along the second leg, the downside section of turning to and the 3rd leg as the free suspension ring between two apex roller rooms for making band during annealing process.
At During Annealing, sheet metal strip via in the continuous access arrangement of gas confinement part of ingress, entrance chute of advancing along direction upwards towards the first apex roller room subsequently.After apex roller room, band is advanced towards the second apex roller room as being then upward through heating station under free suspension hoop and cooling station.In heating station, according to the type of strip material of annealing, band is made to reach annealing target temperature needed for it, specifically, between the temperature of 800-1200C.In cooling station, make the temperature of band be reduced to acceptable lesser temps so that it is directed to above the roller of the second apex roller room, specifically, be reduced to the temperature between 80-230C, and can not distortion or damage.After the second apex roller room, band is passed down through discharges chute (it can cool further at discharge chute place before discharge), leaves equipment with the gas confinement part via exit.
Therefore the feature of whole equipment is M shape, band in actual treatment district, namely the band be between two apex roller rooms is in M shape, becomes freely sagging ring (chain type line) to hang down, and do not have in the turning point of downside above certain roller of directed process under the impact of its deadweight.In entrance and discharge chute, band is advanced respectively straight up and downwards.
Described M shape cooperation provides many important advantages along its chute specifically arranged and station.First, by building the equipment with significantly longer heating and cooling length, greatly can increase throughput and/or reducing production cost.Compared with attainable in the known furnace structure carrying out heating and cooling in identical Vertical Channel, second provides the longer length available can carrying out critical annealing heating and cooling along it together with the 3rd leg.Secondly, due to this M shape, can obtain different entrances and discharge chute, actual heating and cooling station is separated with the gas confinement part at entrance and exit place by it.
Band entrance and exit is advantageously disposed on first and the 4th lower outer end place of leg, is positioned at than limiting second and the 3rd low horizontal plane place, the apex roller room of leg in upper end.Therefore; even if one of gas confinement part breaks down or breaks, second and the 3rd leg heating and cooling intersegmental part and first and the 4th leg entrance and discharge that the height of chute inside is explosive, lightweight shielding gas is still advantageously trapped in wherein naturally.
In a particular embodiment; the object of M shape stove of the present invention is the shielding gas using low H2 per-cent in first (entrance) and the 4th (outlet) leg; to reduce the amount of the H2 escaped through sealing member, and be separated second with the air infiltration through sealing member with the high H2 per-cent processing section of the 3rd leg.This measure significantly reduces the risk and explosion hazard of catching fire at sealing member place.
Heat insulation brick dust or brick grain or be no longer entrained in gas confinement part (sealing member) from other particles that heating and/or cooling station fall, therefore no longer cause the damage to strip surface.The loss that the band that this quality eliminating contributing to improving annealing process is damaged due to such reason in gas confinement part causes.
Band stretch-draw loss in the gas confinement part of entrance and exit and in apex roller room no longer has impact to the strap tension in heat treatment section, because band is sagging in free ring by means of only its deadweight.Owing to not arranging additional strap tension between apex roller room, so the tension force in the hottest point of band in actual treatment district will be in lower value.The hottest point of band can advantageously along second or the 3rd the height of leg be arranged on the relatively low At The Height higher than the turning point of band.Therefore, under the impact of weight being suspended from the band below it, the strap tension in this hottest point is still lower.Free suspension ring makes during band stops or speed changes that band can freely thermal expansion or contraction, and can not cause the direct risk of strip breaks, also without the need to taking special construction measure to this thermal expansion/contraction.
Be about 80-85m for the programmable maximum height of known inverted u-shaped bright annealing oven.Higher than this height, the weight being suspended from the band below its hottest point may form so large stress in tropocal wood, and band may be out of shape, and causes it useless.According to product mix, this type of inverted u-shaped stove is designed attainable maximum productivity and is effectively restricted to about 110,000-150,000t/a by this.Nowadays, by new M profile design according to the present invention, throughput significantly can be increased to the about twice of the attainable throughput of prior art.
With the expected such high productivity of new M shape annealing device and window of web velocities, independent entrance chute (namely, first leg of M) can be advantageously used in before band enters the second leg (it will be rapidly heated to high temperature at the second leg place), remove/reduce the air molecule layer being still attached to strip surface after the sealing member through band ingress.If do not weaken before band reaches high annealing temperature or remove this very thin gas cloud, then strip surface can be easy to oxidation and variable color in annealing process, and this is unacceptable.
Band turns to the downside section of turning to contactless has stabilizing influence, because band trends towards substantially flatly stretching in turning point to the second and the 3rd ribbon shape in leg.Due to the M shape of equipment, no longer need the gas confinement part of lower-most point place inlet porting at equipment and/or outlet.Can first and the 4th leg ratio second and the 3rd leg between the lower-most point of the section of turning to that extends higher horizontal plane place gas confinement part is set.Therefore, effective control of the deflector roll of the enough large distance in closure member upstream or downstream is arranged on by (such as) to improve band advancing through gas confinement part.
It is pointed out that the M shape stove design of the free suspension center ring with band is not open by publication, also there is not industrial application open.Although the design of inverted U-shape shape stove is known for clean annealing, but normal U-shape stove design (band can be directed as the free suspension ring between two apex roller rooms) also becomes known for other purposes except clean annealing in the art, the similar naked light directly blowing burner that such as utilizes is annealed.See such as JP-51109204 and NL-1013752.But the design of these known U-shape stoves is not combined into the process tunnel of M shape, the more important thing is, is not suitable for clean annealing.This is especially because U-shaped stove not builds the explosive shielding gas of height for holding containing H2.If such stove is filled containing H2 shielding gas, when it can combustion/explosion immediately when directly blowing burner in conjunction with it and using.Even if when using together with indirect heater, have at its top in the U-shaped stove of opening and will form many H2 explosion hazards.
Light H2 gas can easily in upward direction via be present in U-shape leg upper end band entrance and exit escape.Therefore, highly flammable H2 gas can easily escape into ambient air from furnace interior, and air can enter in the stove holding H2, replaces the H2 escaped.
When top has band entrance and exit, due to the shaft effect of the stove of heat, the minute leakage in lower wing furnace section enters risk in H2 furnace atmosphere by bringing air.
If the top seal of band entrance and exit breaks down, or these sealing members are unexpectedly in for a long time and open, then can cause rapidly breakneck situation, because a large amount of H2 gas is lightweight and naturally will escape and flow out in environment compared with ambient air due to it, almost will cause immediately catching fire or explosion hazard.
In sum, the blast of U-shaped stove and ignition hazard are that clean annealing institute is completely unacceptable, and supervision safety mechanism can not agree to such design.Therefore, of the present invention is that bright annealing equipment proposes brand-new scheme in the first and the 4th M shape process tunnel in leg with special entrance and exit tunnel.
In a preferred embodiment according to the present invention, heating station at least extends along a part for the second leg, and cools station and at least extend along a part for the 3rd leg.Therefore, the downside section of turning to can be used for heating its sheet metal strip of directed process, or (has done sth. in advance) to start Slow cooling band after fully annealing at band.This contributes to the ability of raising equipment and/or the quality of annealing process.
In a particular embodiment in accordance with the present invention, heating station is set to not only extend along the second leg, but also extends along the downside section of turning to and along the bottom of the 3rd leg.Cooling station is set to extend along the top of the 3rd leg.Because the length can carrying out the band process tunnel of the heating and cooling of band along it is larger, so throughput advantageously can be increased further and/or reduce production cost.In addition, can be selected as making can being advantageously placed in the transition section cooling station band along the height of a heating station part for the bottom of the 3rd leg and start steepening and in a part close to vertical free suspension ring.This chance significantly making band knock unintentionally this transition section and/or cooling station wall minimizes.In addition, this can make the opening of this transition section sharply reduce compared to the tunnel width of the 3rd chamber interior.Transition section elongated like this contributes to preventing the thermosteresis towards cooling station.
In alternative embodiments, heating station just terminates after the section of turning to of downside, and cooling station starts immediately after the section of turning to of downside.When combining being set using of the pre-heat station that extends along the top of the top of the first leg and/or the second leg this especially may because like this band still can be made in same leg to reach annealing temperature needed for it at the heating station through arranging along it.Such as, if the top of the second leg is used for such pre-heat station, then pre-heat station can be configured to injection pre-heat station, and it comprises the ventilator blowing hot gas to band, thus is preheated to the temperature up to 850 degrees Celsius.Then, the heating station (such as, retort furnace type heating station) be positioned at below it in the second leg can be used for being heated to by band up to 1100 degrees Celsius or higher temperature.Then, the 3rd leg can be advantageously whole for making band cool back to acceptable lesser temps before above the second apex roller room, such as 150 degrees Celsius.Then, also the downside section of turning to can be used as (soft) cooling section, can (do sth. in advance) wherein to start annealing band is cooled gradually.
Heating station can be formed by single or multiple heating chamber.But preferably, heating station comprises at least three heating chambers be separated.Along the first Room that the second leg extends, along the second Room that the downside section of turning to extends, and the 3rd Room extended along the bottom of the 3rd leg.These different heating chambers utilize substantially airtight flexible connecting member, and specifically, flexible (stainless steel) corrugated tube comes separated from one another.By heating station being divided into three rooms, each room can comprise its a set of heating unit of oneself and/or the heating unit of its oneself type and structure, and can prevent the interaction between heating station section better.Such as, the second Room can remain on than first with at the 3rd relative low temperature in Room.Selection for the heat insulation of this second Room and heating unit becomes so crucial for maintaining in annealing process for low dew point.Due between first and second and the second and the 3rd transition section place between Room do not have heat energy to lose, these airtight flexible connecting members can be configured with relatively large passage, make band freely can pass these transition sections, and can not damage owing to hitting thereon.From preferably hotter first and/or the 3rd Room contribute to heating this second Room towards any heat of the second Room radiation.
Due to the movement/distortion (bulging caused by the tempering of the rolling tensile force in band or warpage) of band in the first Room, can start to occur that strip temperature is poor on the width of band.By by the temperature of the thermal creep stress of the second Room for reaching at the end of the first Room closer to band, such strip temperature can be reduced poor.This contributes to enabling the end of band in the 3rd Room reach better temperature uniformity on its whole width.
First, second, and third heating chamber can be retort furnace type or refractory materials type.All types of combination is all fine.This selection can be depending on the preference of the energy cost in the concrete situation of building of this equipment, required strand-anneal(ing) temperature or user.Refractory materials type heating chamber can obtain higher throughput, but needs the thermofin of special high purity Al2O3 level heat resisting brick, and it heats and the low dew point conditions be adjusted to needed for process or again cooling needs take a long time.Retort furnace type heating chamber can be heated to its low dew point conditions more quickly and again cool, because shielding gas only directly contacts with retort furnace, and does not directly contact with the stove thermofin (such as, ceramic fiber) around retort furnace.
Second heating chamber is preferably refractory materials type, direct towards band radiant heat during annealing process by heating unit.By the comparatively low operating temperature of the second Room, such as, this second Room can overall or major part isolation fiber-covered use standard C r/Ni resistance heating element to heat, or heats with radiator tube.This can rapid heating cool and/or regulate this second Room.
Like this can rapid heating and/or cooling the second Room be useful when strip breaks.If strip breaks, it freely falls to the bottom (in this case, the bottom of the second Room) of the part that heating station extends along the downside section of turning to.By the two ends suitably driving the roller of apex roller room to locate the band of fracture, band two ends can be made all to be in the bottom of heating station.By arranging door locking bottom this, can simply and rapidly band two ends are linked together again.In addition, described bottom can be provided with the special receiving section with gas confinement part, to form gate.This gate contributes to opening door locking so that prevent shielding gas from escaping when being reconnected by the band of fracture and prevent the remainder of heating station to be exposed to air.
In a modification, the top of entrance chute is provided with another protection valve, makes the gate forming shielding gas in the bottom of entrance chute together with the shielding gas closure member near band entrance.Similarly, discharge the top of chute and also can be provided with another protection valve, make the gate forming shielding gas together with the shielding gas closure member near the bottom of discharging chute exports with band.Described gate makes it possible to carry out filling access with the shielding gas dissimilar with shielding gas used in the actual treatment district of heating and cooling station and/or discharge chute.Such as; compared with needed in actual treatment district; the hydrogen richness of the shielding gas in chute is lower; dew point is higher; and in heating and cooling station; need the shielding gas of hydrogen richness high (major part is 70-100%H2, remaining as N2) and dew point very low (specifically, lower than-40C).Use the shielding gas of low H2 content to save cost in chute and improve the security of equipment; because during entrance and/or exit gas closure member are opened in normarzing annealing process and short period of time, the danger that the shielding gas of the lower H2 content in chute catches fire or explodes is all lower.Also by gas sweetening and regulation system, shielding gas is circulated so that under holding it in correct condition in heating and cooling station, and without the need to so doing the gas in chute.If band departs to side in its entrance or outlet closure member, then may be necessary temporarily to open closure member band to be refitted in its correct (center) position.If the weld seam of band needs through closure member, then also may be necessary temporarily like this to open closure member.Owing to being provided with gate; and the shielding gas that H2 content is lower is present in wherein; with with identical explosivity used in heating and cooling station and the highly protected gas of costliness is filled compared with the situation of chute, advantageously, the problem temporarily opening closure member is less.
Embodiment favourable is further described in the dependent claims.
The invention still further relates to the application of the annealing device according to claim 18 or 19.
Accompanying drawing explanation
Illustrate in greater detail the present invention with reference to the accompanying drawings, wherein:
Fig. 1 schematically shows the first embodiment according to annealing device of the present invention, and it has two retort furnace types and a refractory materials type heating chamber;
Fig. 2 illustrates the modification of Fig. 1, and it has pre-heat station on the top of the first leg;
Fig. 3 illustrates another modification of Fig. 1, and it has a retort furnace type and two refractory materials type heating chambers;
Fig. 4 illustrates another modification of Fig. 1, and it has pre-heat station on the top of the second leg.
Embodiment
In FIG, annealing device entirety gives label 1.Equipment 1 comprises M shape process tunnel, and it is limited by entrance chute 2, first apex roller room 3, first retort furnace type heating chamber 4, second refractory materials type heating chamber the 5, the 3rd retort furnace type heating chamber 6, non-shock chilling section 7, injection cooling section 8, second apex roller room 9 and discharge chute 10 successively.During annealing process, band 14 is passed through tunnel with continuous velocity substantially by the suitable actuating of band feeding unit and belt discharger so that band in special time period with specific required annealing temperature annealing, subsequently under again cool.Band charging and discharger can be arranged on the upstream of entrance and the downstream of outlet, such as, can be formed by driven roll.
Entrance chute 2 limits the first leg of M shape, and its entrance 17 place is provided with gas confinement part 16, is provided with valve (gas gate) 18 at an upper portion thereof.Gas confinement part comprises one group of roller, and band can pass them substantially airtightly to enter chute between described roller.The gate (sluice) formed between gas confinement part 16 and valve 18 is filled with shielding gas.Such as, valve 18 can be formed by mechanism (roller) or air generation plants (air knife).
Apex roller room 3,9 respectively comprises one group of guide reel 20,21, and band 14 is advanced from advancing straight up to guide to by straight down.Guide reel is preferably connected to drive unit, and described drive unit often drives it to rotate when needed.
First heating chamber 4 limits the second leg of M shape and comprises elongated cylindrical retort furnace 24, and described retort furnace 24 is encapsulated by thermal sleeve 25, and heating unit (burner) is arranged in thermal sleeve 25 with from indirect heating retort furnace 24.Retort furnace is therefore, it is possible to indirect heating is through its band 14.Because retort furnace 24 reaches very high temperature, it will significantly expand in a longitudinal direction.Retort furnace 24 utilizes expansion arc 26 (specifically, according to the equilibrium swelling section of EP 0 914 481) to carry out upwards free expansion.The downside of retort furnace 24 utilizes airtight flexible corrugated stainless steel tubing 27 to be connected to the second heating chamber 5.This corrugated tube 27 also can bear the expansion of retort furnace 24.
Second heating chamber 5 limits the downside section of turning to of M shape and comprises thermal wall, and an electric heating element is arranged on before it.Heating unit is therefore, it is possible to direct heating is through its band 14.Bottom it, room 5 is provided with gate 28, and this gate 28 has door locking 29.This gate comprises the gas confinement part 30 such as by suitable roller or dodge gate formation.If needed, can arrange the band trap setting of ground roll or another type in bottom, it need not contact with band during normarzing annealing process.Side thereon, room 5 utilizes airtight flexible corrugated stainless steel tubing 31 to be connected to the 3rd heating chamber 6.
3rd heating chamber 6 limits the bottom of the 3rd leg of M shape, specifically, the about half of the length of the 3rd leg, and comprise elongated cylindrical retort furnace 34, described retort furnace 34 is encapsulated by thermal sleeve 35, and heating unit is arranged on wherein with from indirect heating retort furnace 34.Expansion is born by corrugated tube 31 equally in the downside of retort furnace 34.Retort furnace 34 also utilizes expansion arc (specifically, according to the equilibrium swelling section of EP 0 914 481) to carry out upwards free expansion.
Room 4,5 forms heating station together with 6, band 14 can be made to obtain anneal needed for it well along its total length.The hottest point HP of band 14 appears at the end of the 3rd heating chamber 6.Non-shock chilling section 7 forms cooling station together with injection cooling section 8, annealing band 14 can be made to be cooled to temperature lower than the maximum temperature (specifically, lower than 250C) of allowing in the second apex roller station well downwards along its total length
Discharge chute 10 and limit the 4th leg of M shape, and export 37 places at it and be provided with gas confinement part 36, be provided with valve 38 at an upper portion thereof.Described gas confinement part comprises one group of roller, and band can pass them substantially airtightly to leave chute between described roller.The gate formed between gas confinement part 36 and valve 38 is filled with shielding gas.Such as, valve 38 can be formed by mechanism (roller) or air generation plants (air knife).
The rear cooling station 40 spraying cooling type is provided with on the top of discharging chute 10.Valve 38 is just arranged on below this rear cooling station 40.
Apex roller room 3, heating chamber 4,5,6, non-shock chilling section 7, spray cooling section 8, apex roller room 9 and rear cooling station 40 and all construct airtightly; and be all connected to each other airtightly; make them can be filled with the shielding gas being applicable to required annealing process, such as H2, H2/N2, argon etc.Entrance chute 2 is selected as being different from shielding gas used in heating and cooling station with shielding gas used in discharge chute 10, specifically, and the H2 of lower aq.
A kind of modification shown in Fig. 2, wherein the top of entrance chute 2 is provided with the pre-heat station 45 spraying pre-add pattern of fever.Use from first and the 3rd flue gas (flue gas) indirect heating pre-heat station 45 of burner of heating chamber 4,6.Such as, the heat of these flue gases can utilize gas heat exchanger to pass to the shielding gas circulating through pre-heat station.Therefore, can reduce costs further.
Another kind of modification shown in Fig. 3, wherein the 3rd heating chamber 6 is refractory materials type now, and it has thermal wall 50, and an electric heating element is arranged on before it.
Another kind of modification shown in Fig. 4, the top wherein along second leg in M shape process tunnel arranges the pre-heat station 60 spraying pre-add pattern of fever.The first retort furnace type heating chamber 61 that pre-heat station 60 and the bottom along the second leg are arranged is arranged point-blank in one.Second refractory materials type heating chamber 62 limits the downside section of turning to of M shape.3rd leg of M shape is now whole to be formed by cooling station.This cooling station comprises non-shock chilling section 63 and sprays cooling section 64.
Spray pre-heat station 60 to operate as other equipment section with shielding gas, and utilize forced convection by its heat trnasfer to band.The advantage of this embodiment is, no longer needs the second retort furnace type heating chamber.This makes the structure of equipment more simply and more cheap.Band even can be preheated to the temperature between 400-800 degree Celsius at pre-add hot arc, and this depends on required annealing process, total cost and expenditure value.Advantageously, compared with retort furnace type well heater, convection preheats and can heat band more quickly.Therefore, only in the length of the first leg, required high annealing temperature still can be reached.The downside section of turning to can be advantageously used for now pure soaking (soaking) section or be used as Slow cooling section (all only needing the capacity limited).
When expecting to safeguard retort furnace type heating chamber 61, pre-add hot arc 60 can be moved on to side, making to mention retort furnace by the vertical direction.In the embodiment shown, the third and fourth leg is constructed to slightly shorter than the first and second legs, makes pre-heat station 60 to be moved to side, moves to above the third and fourth leg simultaneously.But, if need the third and fourth leg longer, then pre-heat station 60 also can be made to be shifted towards other direction.
Except illustrated embodiment, many modification are also possible.Such as, the shape and size alterable of chute, heating chamber and other parts.In addition, heating station and/or the cooling station of other types and quantity can be used.Replace the retort furnace mainly upwards expanded, it also can be installed to be and make it main along expanding in downward direction.Annealing device is preferred for the clean annealing of the stainless strip with the BA quality mentioned in the early time.But it also can be used for the accurate clean annealing of the stainless strip of so-called 2B quality rolling.By equipment according to the present invention; even if the shielding gas not stricter (lower %H2 and Geng Gao dew point) that the shielding gas used is more used than BA quality; also can, to such 2B level strand-anneal(ing), make can completely or partially eliminate further cleanup acid treatment.Strip temperature in second apex roller room can be maintained relatively high temperature, such as 150-200C, and use the deflector roll not damaging the particular design of band at such a temperature.Also by band in the further cooling of discharging in chute and by this heat delivery to the band entering entrance chute, in entrance chute with discharge between chute and obtain convective heat exchange.This also can help to save the energy.
Therefore, according to the present invention, obtain a kind of annealing device, it not only increases security and annealing quality, and simultaneously with the vertical bright annealing equipment (inverted u-shaped) of prior art usually annual 70,000-130, compare for 000 ton, annual 200 can be reached by the embodiment that this equipment has two retort furnace type heating chambers, 000-230, the throughput of 000 ton, even can reach annual 300 in the embodiment with two refractory materials type heating chambers, 000 ton or larger throughput.
Claims (15)
1. an annealing device, it, for being directed across the continuous annealing of the sheet metal strip of described equipment, comprising:
-entrance chute (2);
-with the heating station of heating unit;
-with the cooling station of refrigerating unit;
Described entrance chute (2), described heating station and described cooling station set gradually, and be substantially connected to each other airtightly, them are made to limit the substantially airtight band process tunnel longitudinally wriggled, described band process tunnel will be filled with shielding gas, and there is the tunnel segment vertically pointed to, described tunnel segment utilizes apex roller room (3, 9) be connected to each other, described apex roller room has at least one roller (20, 21), another tunnel segment vertically pointed to is guided to from the tunnel segment that is vertically pointed to for by described band (14),
Described tunnel has band entrance (17) and band outlet (37) in its corresponding outer end, described band entrance and band outlet are provided with shielding gas closure member (16,36),
It is characterized in that:
Described equipment also comprises discharges chute (10), and described discharge chute is also connected to described cooling station substantially airtightly in the downstream of described cooling station,
First (3), the described heating station of described entrance chute (2), apex roller room, described cooling station, second (9) of apex roller room and described discharge chute (10) limit the tunnel that M shape is wriggled together, described tunnel has four legs, described leg is via two apex roller rooms (3,9) and the downside section of turning to be connected to each other, wherein:
-described entrance chute (2) extends along first leg;
-described heating station and described cooling station extend along second leg, the described downside section of turning to and the 3rd leg;
-described discharge chute (10) extends along the 4th leg,
Band feeding unit and belt discharger are wherein set, for the described band (14) made during annealing process as free suspension ring in described two apex roller rooms (3,9) be directed across the described heating and cooling station extended along described second leg, the described downside section of turning to and described 3rd leg between continuously, and wherein band entrance (17) and band outlet (37) are arranged on the lower end of described entrance chute (2) and described discharge chute (10).
2. annealing device according to claim 1, is characterized in that, described heating station at least extends along a part for described second leg, and described cooling station at least extends along a part for described 3rd leg.
3. annealing device according to claim 2, is characterized in that, described heating station also extends along the described downside section of turning to.
4. annealing device according to claim 1, is characterized in that, described cooling station is along whole described 3rd leg extension substantially.
5. annealing device according to claim 3, is characterized in that, described heating station also extends along the bottom of described 3rd leg, and described cooling station extends along the top of described 3rd leg.
6. annealing device according to claim 3, is characterized in that, described heating station comprises at least two heating chambers (4,5) be separated:
-the first room (4), it extends along described second leg,
-the second room (5), it extends along the described downside section of turning to,
Described room utilizes substantially airtight flexible connecting member separated from one another.
7. annealing device according to claim 6, is characterized in that, described heating station also comprises:
-three Room (6), it is connected to described second Room (5) and bottom along described 3rd leg extends.
8. annealing device according to claim 6, is characterized in that, described heating chamber (4,5,6) utilizes substantially airtight flexible bellow (27) separated from one another.
9. according to aforementioned annealing device according to claim 6, it is characterized in that, described second heating chamber (5) is refractory materials type, and described heating unit is direct towards described band (14) radiant heat during annealing process.
10. annealing device according to claim 1; it is characterized in that; the top of described entrance chute (2) is provided with another protection valve (18); make the gate forming shielding gas at the bottom place of described entrance chute (2) together with the shielding gas closure member (16) near band entrance (17)
And/or the top of described discharge chute (10) is provided with another protection valve (38), together with the shielding gas closure member (36) that makes to export near (37) with band at the bottom place of described discharge chute (10), form the gate of shielding gas.
11. annealing devices according to claim 1, is characterized in that, the described entrance chute (2) extended along described first leg comprises pre-heat station (45) at an upper portion thereof.
12. annealing devices according to claim 1, is characterized in that, the described discharge chute (10) extended along described 4th leg comprises rear cooling station (40) at an upper portion thereof.
The application that 13. 1 kinds of annealing devices according to claim 1 are annealed for sheet metal strip, comprises the following steps:
-filling described M shape with protective shielding gas wriggles tunnel;
-by guiding described sheet metal strip (14) through described M shape tunnel, in described heating station, sheet metal strip is heated simultaneously, then in described cooling station, described sheet metal strip is cooled, described sheet metal strip is annealed.
14. application according to claim 13, is characterized in that, it is for the clean annealing of stainless strip (14), and wherein, described shielding gas comprises at least 50%H
2, and wherein said heating station is heated to the temperature of at least 850 degrees Celsius, stainless strip (14) is wherein heated to the temperature of at least 700 degrees Celsius.
15. application according to claim 13, is characterized in that, with the described second and the 3rd high H in leg
2separately, described first and the 4th exists low H in leg to percentage gas
2the shielding gas of per-cent.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2004883A NL2004883C2 (en) | 2010-06-14 | 2010-06-14 | Annealing installation with m-shaped strip treatment tunnel. |
| NL2004883 | 2010-06-14 | ||
| PCT/NL2011/050364 WO2011159149A1 (en) | 2010-06-14 | 2011-05-26 | Annealing installation with m-shaped strip treatment tunnel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103025898A CN103025898A (en) | 2013-04-03 |
| CN103025898B true CN103025898B (en) | 2015-04-29 |
Family
ID=43531213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180029333.1A Active CN103025898B (en) | 2010-06-14 | 2011-05-26 | Annealing installation with m-shaped strip treatment tunnel |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20130127095A1 (en) |
| EP (1) | EP2580360B1 (en) |
| CN (1) | CN103025898B (en) |
| NL (1) | NL2004883C2 (en) |
| WO (1) | WO2011159149A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103710512B (en) * | 2014-01-11 | 2016-04-20 | 广东志达精密管业制造有限公司 | Steel-pipe annealing device and annealing process thereof |
| CN104278140A (en) * | 2014-09-28 | 2015-01-14 | 江苏大力神科技股份有限公司 | Production method of ultra-thin full-hard aluminum and zinc-plated plate |
| CN107739810A (en) * | 2017-10-30 | 2018-02-27 | 浙江超龙汽车零部件有限公司 | Roll steel heat treatment carrier |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51109204A (en) * | 1975-03-24 | 1976-09-28 | Daido Steel Co Ltd | TATEGATER ENZOKUNET SUSHORIRO |
| CN85109422A (en) * | 1984-12-28 | 1986-07-16 | 中外炉工业株式会社 | The continuous annealing furnace that is used for metal strip |
| CN1215435A (en) * | 1996-04-12 | 1999-04-28 | 热技术公司 | Vertical annealing furnace for a strip treatment device |
| NL1013752C2 (en) * | 1999-11-23 | 2001-05-28 | Thermtec B V | U-shaped installation for thermal oxidation and cooling of a strip metal band has downward leg and base with heating means and upward leg with heating and cooling means |
| CN201354383Y (en) * | 2009-02-28 | 2009-12-02 | 丁海涛 | Vertical Muffle-free stainless steel strip furnace for brightness |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2499191A (en) * | 1948-09-22 | 1950-02-28 | Gen Electric | Vertical loop furnace |
| JP3356864B2 (en) | 1994-03-31 | 2002-12-16 | 中外炉工業株式会社 | Heating zone of vertical continuous bright annealing furnace for steel strip |
| FR2903122B1 (en) * | 2006-06-30 | 2008-09-12 | Stein Heurtey | DEVICE FOR SECURING AN OVEN EQUIPPED WITH FAST HEATING AND COOLING OPERATING UNDER CONTROLLED ATMOSPHERE. |
-
2010
- 2010-06-14 NL NL2004883A patent/NL2004883C2/en not_active IP Right Cessation
-
2011
- 2011-05-26 CN CN201180029333.1A patent/CN103025898B/en active Active
- 2011-05-26 EP EP11723742.0A patent/EP2580360B1/en active Active
- 2011-05-26 WO PCT/NL2011/050364 patent/WO2011159149A1/en active Application Filing
- 2011-05-26 US US13/703,938 patent/US20130127095A1/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51109204A (en) * | 1975-03-24 | 1976-09-28 | Daido Steel Co Ltd | TATEGATER ENZOKUNET SUSHORIRO |
| CN85109422A (en) * | 1984-12-28 | 1986-07-16 | 中外炉工业株式会社 | The continuous annealing furnace that is used for metal strip |
| CN1215435A (en) * | 1996-04-12 | 1999-04-28 | 热技术公司 | Vertical annealing furnace for a strip treatment device |
| NL1013752C2 (en) * | 1999-11-23 | 2001-05-28 | Thermtec B V | U-shaped installation for thermal oxidation and cooling of a strip metal band has downward leg and base with heating means and upward leg with heating and cooling means |
| CN201354383Y (en) * | 2009-02-28 | 2009-12-02 | 丁海涛 | Vertical Muffle-free stainless steel strip furnace for brightness |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103025898A (en) | 2013-04-03 |
| EP2580360A1 (en) | 2013-04-17 |
| WO2011159149A1 (en) | 2011-12-22 |
| US20130127095A1 (en) | 2013-05-23 |
| NL2004883C2 (en) | 2011-12-15 |
| EP2580360B1 (en) | 2014-04-02 |
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Effective date of registration: 20160728 Address after: Graz Patentee after: Andritz Tech & Asset Man GmbH Address before: Rotterdam Patentee before: Andritz Thermtec B. V. |