EP2718470A1 - Verfahren und vorrichtung zur vorbehandlung eines walzguts vor dem warmwalzen - Google Patents
Verfahren und vorrichtung zur vorbehandlung eines walzguts vor dem warmwalzenInfo
- Publication number
- EP2718470A1 EP2718470A1 EP12726403.4A EP12726403A EP2718470A1 EP 2718470 A1 EP2718470 A1 EP 2718470A1 EP 12726403 A EP12726403 A EP 12726403A EP 2718470 A1 EP2718470 A1 EP 2718470A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- furnace
- heating
- oxygen
- preheating
- rolling stock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- 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
- C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
-
- 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
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/0016—Chamber type furnaces
-
- 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
- F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
- F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
Definitions
- the invention relates to a method and a device for the pretreatment of a rolled steel material before hot rolling.
- a method of heating a slab in a multi-part furnace wherein the slab is preheated in a preheating zone of the furnace by a burner and then heated in a reducing atmosphere of a heating zone of the furnace.
- the exhaust gas of the heating zone is supplied to the burner in the preheating zone of the furnace, where the unburned CO of the exhaust gas is burned by a burner.
- a disadvantage of this method is that the slab must be descaled either before or after heating.
- a disadvantage of descaling prior to heating is that the scale is difficult to remove due to its slow growth;
- a disadvantage of the descaling after heating is that the rolling stock is at a higher temperature than the
- the object of the invention is to find a method and a device with which the rolling stock can be both energy-efficiently heated and thoroughly descaled before hot-rolling. This object is achieved by a method according to claim 1, comprising the following method steps:
- Atmosphere is maintained.
- the rolling stock for example a slab, a so-called intermediate strip or an intermediate strip, in a preheating oven by a plurality of burners to a temperature of typically more than 1000 ° C, preferably more than 1050 ° C preheated. At these temperatures, the rolling stock is particularly descaled. After descaling, the rolling stock is heated in a heating furnace through several burners to rolling temperature, the burners a
- Carbon carriers for example, a heating gas such as methane, ethane, propane or butane, or even a liquid fuel such as fuel oil
- a heating gas such as methane, ethane, propane or butane
- a liquid fuel such as fuel oil
- the exhaust gas of the heating furnace still has flammable Shares of CO and typically also H2. Subsequently, at least a portion of the exhaust gas with the addition of
- Oxygen is introduced into the preheat furnace, where the
- the amount of oxygen in the preheating furnace is now chosen so that sets an oxidizing atmosphere in the preheating furnace.
- Preheating furnace provides a rapid scale growth on the
- the burners in the preheating furnace and the burners in the heating furnace are designed as gas-fired oxygen burners, which are a heating gas - typically a saturated hydrocarbon, such as
- a heating gas is additionally introduced into the preheating furnace and burned.
- the power supply is increased in the preheating furnace, but also with the addition of a hot gas the
- Quantity of oxygen in the preheating furnace is chosen so that the rolling stock is kept in an oxidizing atmosphere.
- the descaled rolling stock is immediately after the descaling in an induction furnace is heated, wherein the rolling stock is kept in the induction furnace by a second part of the exhaust gas of the heating furnace in a reducing atmosphere.
- the use of the induction furnace ensures a highly dynamic heating of the rolling stock, so in particular
- the exhaust gas of the heating furnace is divided into a first part and a second part of the exhaust gas at the inlet end of the heating furnace in the transporting direction of the rolling stock. It is advantageous to also the second part of the exhaust gas after flowing through the induction furnace, preferably against the transport direction of the rolling stock, in the
- the energy content of the exhaust gas of the heating furnace is utilized as best as possible, in which the temperature of the second exhaust gas heats the rolling stock in the induction furnace and contributes to the heating of the preheating furnace by means of the afterburning.
- the passing of the second part of the exhaust gas against the transport direction of the rolling stock ensures that the hot exhaust gas for heating the hot
- an actual gas concentration in particular the actual gas concentration of CO and / or H 2
- the controller determines a manipulated variable with the aid of a desired gas concentration and at least one actuator (eg Valve that changes the oxygen supply to the burners) provides, so that the actual gas concentration of the desired gas concentration corresponds as possible.
- the degree of reduction of the reducing atmosphere in the preheating oven can be set very precisely.
- the controller determines a manipulated variable with the aid of a desired oxygen concentration and
- At least one actuator e.g., a valve incorporating the
- Oxygen supply to the burners changed), so that the actual oxygen concentration corresponds to the desired oxygen concentration as far as possible.
- the growth of scale in the preheating furnace can be controlled in a controlled manner, so that the descaling can be carried out as thoroughly as possible and, moreover, the rolling stock is cooled as little as possible.
- the temperature of the rolled product can be set with high precision when an actual temperature of the rolling stock is measured immediately before descaling or immediately before hot rolling and fed to a regulator, the regulator under
- a desired temperature determines a manipulated variable and at least one actuator provides, so that the actual temperature of the target temperature corresponds as possible.
- the object of the invention is also by a
- preheating furnace for preheating the rolling stock, wherein the preheating furnace has a plurality of burners for burning a
- Carbon carrier has;
- preheated rolling stock wherein the descaling device is downstream of the preheating furnace;
- the heating furnace for heating the descaled rolling stock to rolling temperature, the heating furnace having a plurality of burners for burning a carbon carrier, and the
- Exhaust gas recirculation line leads from the heating to the preheating furnace; and - An oxygen line for introducing oxygen into the preheating furnace, wherein the oxygen line in the
- Preheating furnace opens.
- the burners are as
- Oxygen burner for burning a hot gas with the addition of oxygen formed This allows the
- Preheating oven In a powerful embodiment is a
- Induction oven disposed immediately after the descaling, wherein the heating oven is connected via an exhaust duct to the induction furnace. It is advantageous that in the transport direction
- Exhaust gas recirculation line is connected to the preheating furnace.
- Heating oven or the oxygen concentration in the preheating oven are set very accurately.
- FIG. 1 shows an illustration of a device according to the invention with an induction furnace.
- FIG. 2 shows a control diagram for the preheating furnace
- the rolling stock designed as intermediate strip 3 is fed to a preheating furnace 4 after rough rolling in a two-stand rolling mill 1 in the transporting direction 10, where it is preheated by a plurality of oxygen burners 11 to a temperature of 1050 ° C. This burn the
- Oxygen burner 11 the heating gas methane with the addition of technically pure oxygen. Moreover, in the preheating furnace 4, a first part 12 and a second part 13 of an exhaust gas of a downstream heating furnace 7 are post-combusted. After preheating, the rolling stock 3 is in a descaling device 5, which serves as a rotary descaling device
- the rolling stock 4 is heated in a heating furnace 7 to a rolling temperature of 1150 ° C, so that the rolling stock in the last rolling pass in the frame 9b still has an austenitic structure.
- the rolling stock is heated by 9 rows of oxygen burners in the lower part of the furnace and 9 rows of oxygen burners in the upper part of the furnace, again burning methane with the addition of technically pure oxygen.
- the amount of oxygen supplied to the oxygen burners 11 is adjusted so that the methane in the heating furnace 7 is burned substoichiometrically.
- the resulting at the assumed bandwidth amount of exhaust gas 12 of a total of 10,000 m 3 iN / h is in each case in the upper part of the furnace and in the collected at the bottom of the furnace, has about 10% vol CO and 2% vol H2 and a temperature of about 1000 ° C, and is introduced by means of an exhaust gas recirculation line 14 in the preheating furnace 4.
- a second part of the exhaust gas 13 which constitutes about 5000 m 3 iN / h, flows counter to the transporting direction 10 of the rolling stock through the induction furnace 6 After flowing through the induction furnace, the second part of the exhaust gas 13 still has a temperature of near 1000 ° C. and is likewise introduced into the preheating furnace 4 via a further exhaust gas recirculation line 14.
- the first part 12 and the second part 13 of the exhaust gas a total of 15000 m 3 iN / h afterburning, wherein the preheating furnace additionally methane as heating gas, specifically about 1000 m 3 iN / h, and oxygen, specifically approx. 2000 m 3 iN / h, are supplied.
- the actually supplied amount of oxygen is regulated so adjusted that the rolling stock 3 is exposed in the preheating furnace 4 an oxidizing atmosphere.
- Oxygen burner 11 in the preheating furnace 4 and in the heating furnace 7 each approximately 10 MW of thermal energy.
- Preheating furnace 4 heats the rolling stock with a thermal power of an additional nearly 2 MW.
- the rolling stock in the induction furnace 6 is heated very dynamically with an adjustable heating power of about 5 to 10 MW.
- the gas quantities given are specific to the embodiment of Figure 1 and therefore can vary widely.
- FIG. 2 shows a control scheme for carrying out the
- the rolling stock 3 is preheated in a preheating furnace 4 by a plurality of burners 11, then descaled in a descaling device 5, and by means of a heating furnace, not shown in a reducing
- Atmosphere brought to rolling temperature. That at the
- Resulting exhaust gas is introduced by means of an exhaust gas recirculation line 14 in the preheating furnace 4 and post-combusted therein with supply of oxygen and a heating gas, which is methane according to FIG.
- the actual temperature 23 of the rolling stock after preheating and before the descaling is continuously measured by means of a temperature measuring device 23 and fed to a controller 19.
- the actual oxygen concentration 22 in the heating oven 4 is continuously measured by an oxygen concentration meter 20 and also supplied to the controller 19.
- the controller now determines two manipulated variables 26a, 26b, which are each supplied to a control valve 18a, 18b.
- the control valve 18 a changes the amount of oxygen supplied to the preheating furnace 4 via an oxygen pipe 15.
- the control valve 18b changes the amount of heating gas, the
- Preheating 4 is supplied via a heating gas 16. This regulation ensures that the rolling stock 3 is descaled at a suitable temperature, typically> 1000 ° C. or preferably around 1050 ° C., and that the scale growth of the rolling stock 3 in the oxidizing
- Atmosphere of the preheating furnace 4 can be controlled specifically, so that a rapidly grown scale arises in the descaling 5 thoroughly and at low
- Temperature drop can be removed.
- Oxygen burner 11 is heated, wherein each burner technically pure oxygen via an oxygen line 15 and the heating gas methane is supplied via a Schugas Koch 16. For reasons of clarity, only the first burner 11 has been shown somewhat more accurately.
- Temperature measuring device 23 is determined and fed to a controller 19.
- the actual carbon monoxide concentration 29 in the heating furnace 7 is determined by means of a carbon monoxide concentration measuring device 27 and also supplied to the regulator 19.
- Regulating the setpoint temperature 24 and the desired carbon monoxide concentration 28, the controller 19 determines two manipulated variables 26a and 26b which respectively change the supply of oxygen or of heating gas to the burners 11 in the heating oven 7 via control valves 18a, 18b.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Furnace Details (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT8612011A AT511429B1 (de) | 2011-06-10 | 2011-06-10 | Verfahren und vorrichtung zur vorbehandlung eines walzguts vor dem warmwalzen |
PCT/EP2012/060327 WO2012168141A1 (de) | 2011-06-10 | 2012-06-01 | Verfahren und vorrichtung zur vorbehandlung eines walzguts vor dem warmwalzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2718470A1 true EP2718470A1 (de) | 2014-04-16 |
EP2718470B1 EP2718470B1 (de) | 2015-10-28 |
Family
ID=46229468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12726403.4A Not-in-force EP2718470B1 (de) | 2011-06-10 | 2012-06-01 | Verfahren und vorrichtung zur vorbehandlung eines walzguts vor dem warmwalzen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2718470B1 (de) |
CN (1) | CN103582708B (de) |
AT (1) | AT511429B1 (de) |
RU (1) | RU2605733C2 (de) |
WO (1) | WO2012168141A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202013102749U1 (de) * | 2013-05-29 | 2013-10-17 | Otto Junker Gmbh | Vorrichtung zur Wärmebehandlung von metallischem Nutzgut unter Schutzgas-/Reaktionsatmosphäre im Durchlaufbetrieb |
WO2021038108A1 (de) * | 2019-08-30 | 2021-03-04 | Sms Group Gmbh | Verfahren zur wärmebehandlung eines stahlvorproduktes |
CN118421869A (zh) * | 2021-12-27 | 2024-08-02 | 上海华钢不锈钢有限公司 | 基于具有预热机构的不锈钢管退火炉的不锈钢管退火工艺 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63262417A (ja) * | 1987-04-21 | 1988-10-28 | Sumitomo Metal Ind Ltd | 直火式連続加熱炉の無酸化加熱方法 |
JPH0331421A (ja) * | 1989-06-28 | 1991-02-12 | Kawasaki Steel Corp | 方向性けい素鋼スラブの加熱方法 |
DE4236307A1 (de) * | 1992-10-28 | 1994-05-05 | Schloemann Siemag Ag | Verfahren und Anlage zur Herstellung von warmgewalztem Stahlband, insbesondere aus bandförmig stranggegossenem Vormaterial |
DE4402402B4 (de) * | 1994-01-27 | 2004-05-13 | Sms Demag Ag | Verfahren zur Herstellung von warmgewalztem Stahlband aus stranggegossenem Vormaterial und Anlage zur Durchführung des Verfahrens |
NL1000696C2 (nl) * | 1995-06-29 | 1996-12-31 | Hoogovens Staal Bv | Werkwijze en inrichting voor het vervaardigen van een dunne warmgewalste stalen band. |
DE19540978A1 (de) * | 1995-11-03 | 1997-05-07 | Schloemann Siemag Ag | Produktionsanlage zum kontinuierlichen- oder diskontinuierlichen Auswalzen von Warmband |
SE519193C2 (sv) * | 1998-12-18 | 2003-01-28 | Avesta Polarit Ab Publ | Sätt vid framställning av band samt valsverkslinje |
DE10203711A1 (de) * | 2002-01-31 | 2003-08-14 | Sms Demag Ag | Verfahren und Anlage zur Herstellung von Warmband aus austenitischen nichtrostenden Stählen |
DE102004040927A1 (de) * | 2004-08-24 | 2006-03-02 | Sms Demag Ag | Verfahren und Vorrichtung zum Herstellen von Metallbändern |
AT504782B1 (de) * | 2005-11-09 | 2008-08-15 | Siemens Vai Metals Tech Gmbh | Verfahren zur herstellung eines warmgewalzten stahlbandes und kombinierte giess- und walzanlage zur durchführung des verfahrens |
DE102007005015A1 (de) * | 2006-06-26 | 2008-01-03 | Sms Demag Ag | Verfahren und Anlage zur Herstellung von Warmband-Walzgut aus Siliziumstahl auf der Basis von Dünnbrammen |
CN101484593B (zh) * | 2006-06-26 | 2011-06-08 | 西马克·西马格公司 | 基于薄板坯生产硅钢热轧带轧制材料的方法和设备 |
DE102008029581A1 (de) * | 2007-07-21 | 2009-01-22 | Sms Demag Ag | Verfahren und Vorrichtung zum Herstellen von Bändern aus Silizum-Stahl oder Mehrphasenstahl |
CN101181718B (zh) * | 2007-12-11 | 2010-06-02 | 武汉钢铁(集团)公司 | 薄板坯连铸连轧生产宽带钢的方法及其系统 |
DE102009018683A1 (de) * | 2009-04-23 | 2010-10-28 | Sms Siemag Ag | Verfahren und Vorrichtung zum Stranggießen einer Bramme |
CN201525852U (zh) * | 2009-10-23 | 2010-07-14 | 秦皇岛秦冶重工有限公司 | 热风炉烘炉设备 |
-
2011
- 2011-06-10 AT AT8612011A patent/AT511429B1/de not_active IP Right Cessation
-
2012
- 2012-06-01 RU RU2013158326/02A patent/RU2605733C2/ru not_active IP Right Cessation
- 2012-06-01 CN CN201280028378.1A patent/CN103582708B/zh not_active Expired - Fee Related
- 2012-06-01 EP EP12726403.4A patent/EP2718470B1/de not_active Not-in-force
- 2012-06-01 WO PCT/EP2012/060327 patent/WO2012168141A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2012168141A1 * |
Also Published As
Publication number | Publication date |
---|---|
AT511429B1 (de) | 2012-12-15 |
RU2605733C2 (ru) | 2016-12-27 |
AT511429A4 (de) | 2012-12-15 |
CN103582708B (zh) | 2016-06-15 |
CN103582708A (zh) | 2014-02-12 |
RU2013158326A (ru) | 2015-07-20 |
WO2012168141A1 (de) | 2012-12-13 |
EP2718470B1 (de) | 2015-10-28 |
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