EP1134298B1 - Perfectionnements apportés au préchauffage de bandes métalliques notamment dans des lignes de galvanisation ou de recuit - Google Patents
Perfectionnements apportés au préchauffage de bandes métalliques notamment dans des lignes de galvanisation ou de recuit Download PDFInfo
- Publication number
- EP1134298B1 EP1134298B1 EP01400142A EP01400142A EP1134298B1 EP 1134298 B1 EP1134298 B1 EP 1134298B1 EP 01400142 A EP01400142 A EP 01400142A EP 01400142 A EP01400142 A EP 01400142A EP 1134298 B1 EP1134298 B1 EP 1134298B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- zone
- preheating
- burners
- length
- temperature
- 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.)
- Expired - Lifetime
Links
- 239000002184 metal Substances 0.000 title claims abstract description 7
- 238000005246 galvanizing Methods 0.000 title description 7
- 238000000137 annealing Methods 0.000 title description 5
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 claims description 21
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000011282 treatment Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 238000009434 installation Methods 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/52—Methods of heating with flames
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; 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
- C21D11/00—Process control or regulation for heat treatments
Definitions
- the present invention relates to improvements made to the preheating of metal strips, especially steel strips, in direct fire preheating sections, installed in particular at the inlet of the dip galvanizing lines or in annealing lines.
- the preheating is carried out according to several zones whose temperature regulation is independent, generally according to four zones for the lines of high capacity and following two zones for the lines of weak capacity, each of these zones being provided, for example, with four to six burners on each side of the furnace.
- the galvanized or annealed strips in the continuous lines have varying shades, widths or thicknesses and they also scroll to variable speeds, which conditions the heat demand of the zones of the oven which can vary in important proportions.
- variable speeds which conditions the heat demand of the zones of the oven which can vary in important proportions.
- only a small number of these preheating zones are generally used, stopping the first zones in the direction of advancement of the zone. band, or keeping them at a minimum thermal regime, equivalent to about 15 to 20% of their rated power.
- FIG. 1 of the accompanying drawings schematically shows, in side elevation, an exemplary embodiment of a preheating installation comprising two zones of preheating.
- FIG. 1A associates FIG. 1A, which represents the heating power used in the two preheating zones and the variation curve of the temperature of the strip in said zones.
- the preheating installation of the strip 1 comprises two preheating zones 2 and 3. Each of these zones is equipped with burners 4 supplied with combustion air by a manifold 5 and with fuel by a manifold 7
- the power injected into each zone is controlled by combustion and fuel flow control valves 6 and 8, respectively.
- the heating power represented by the shaded area of the graph of FIG. 1A corresponds to 60% of the nominal power of the second zone 3, the first zone 1 operates at least its power, for example 15%.
- Curve 9 shows the temperature rise of the strip in the preheating zones. Under these conditions, the gas and wall temperature of the second preheating zone 3 stabilizes at low levels, of the order of 1150 ° C or lower.
- the oxidation formed on the surface of the strip under these conditions must be eliminated, which requires the establishment, downstream of the zone of the preheat, of a holding zone, under an atmosphere containing hydrogen, long enough to suppress the oxides formed by reduction.
- This reduction must be carried out at high temperature, which generally requires reheating of the strip to levels which are often only achieved with the aim of obtaining this reduction, whereas they are not necessary for the metallurgical treatment of the mixture. steel grade of the band.
- the object of the present invention is to solve the above-mentioned technical problem by providing a novel process and an improved furnace for heating webs in direct fire preheat sections with limited oxidation for all production configurations (line speed, processing characteristics, product characteristics including shade and format).
- this invention in addition to improving the quality of the finished product that it provides, solves the problem of congestion of the installations, encountered in the prior state of the art mentioned above, since its implementation This work makes it possible to limit the dimensions and consequently the costs of the annealing or galvanizing lines to which it is applied.
- this invention relates first of all to a method for reheating metal strips, in particular steel in direct fire preheating sections, in order to limit the oxidation of the heated metal strips, irrespective of the production configurations, which consists in implementing a preheating zone that can be divided, according to its length, into a plurality of unit length zones corresponding to a burner, each of said burners being individually controllable at a fixed speed in order to adjust accurately the air / gas regulation and thus the resulting atmosphere in the furnace, characterized in that a number of burners are ignited from the downstream of the preheating zone, the length of the zone of the furnace concerned by the ignition of said burners and the length of the recovery zone, that is to say of the zone in which the burners are extinguished being ariables in according to the heat demand and in that each burner operates at full power and with a constant air / gas adjustment.
- the originality of the method that is the subject of the present invention resides in the simultaneous implementation of a certain number of characteristics (burner control in all or nothing or proportional mode, preheating zone with variable lengths, feed ratio adapted air / gas burners) in a configuration such that the fineness of operation of the line thus produced makes it possible to improve the quality of the finished product in very large production ranges.
- the ambient and wall temperature of the preheating zone is between 1250 and 1300 ° C.
- the outlet temperature of the preheating zone is adapted to this treatment, which makes it possible to limit or even eliminate the length of the cooling zones installed in downstream of the preheating zone.
- the minimum outlet temperature of the preheating zone is adapted to this treatment in order to limit or even eliminate, if necessary, the length of the heating zones provided downstream of the preheating zone.
- An oven for carrying out the process as specified above comprises a preheating zone divided into a plurality of unit length zones each corresponding to a burner, each of said burners being controlled individually at a fixed speed, characterized in that each burner is controlled individually by means of valves on the oxidizer feed and valves on the fuel supply so as to ignite a number of burners, starting from the downstream of the preheating zone, which corresponds to the heat demand and in that said burners operate at full power and with a constant air / gas adjustment.
- FIGS. 3 and 3A of the appended drawings respectively represent an installation according to the invention and the curve showing the evolution of the temperature of the strip. for an exit temperature of the preheater identical to that of Figure 1A.
- FIG. 3 shows that according to the invention the cutting of the preheating zone is replaced by conventional control zones comprising several burners of the prior art by cutting this preheating zone into a plurality of zones. of unit length corresponding to a burner.
- the burners are controlled by a separate control system that can be conventional proportional type or all-or-nothing type.
- the preheating zone is divided into two preheating zones fed with oxidant and fuel by collectors 5 and 7, each of the burners 4 of the two preheating zones can be controlled individually by means of valves 10 on the circuit. oxidant and valves 11 on the fuel system. These valves can be controlled in proportional mode in order to obtain an adjustment of the power injected by the variation of the flow rates of oxidizer or fuel, or in all or nothing mode, the adjustment of the power injected into the zone then being adjusted by the ratio between the operating time of the burner and its downtime or even adjusted by the choice of the number of burners operating at full power.
- the present invention to operate a number of burners corresponding to the heat demand of the oven at full speed so that the area in which these burners are located is raised to the required temperature level, for example 1300 ° C.
- This heat demand is measured and controlled by an oven control system controlling the ignition of the corresponding number of burners, these burners operating at full speed.
- the four burners implanted at the outlet of the preheating zone operate permanently at 100% of their nominal capacity, the fifth burner of this zone adjusting the amount of power injected, or in proportional mode control of its flow, either by adjusting its operating time.
- the variations in the heat demand of the furnace related to changes in the speed or the format of the product to be treated result in an increase or a reduction in the number of ignited burners, therefore by a variation of the length of the zone in which the temperature conditions are combined to maintain the band in a temperature zone where its oxidation is reduced.
- the zone in which the burners are stopped then behaves as a recovery zone extending that existing upstream of the preheating.
- FIG. 3A the curve of the evolution of the temperature of the strip is plotted for a preheating outlet temperature identical to that of FIG. 1A.
- the final temperature range of the strip for which the oxidation is reduced is used to optimize the length of the oven.
- a strip outlet temperature of the preheating zone of 500 ° C., which is sufficient for its treatment, will be chosen, replacing the temperature of 650 ° C. traditionally imposed by the preheating means. according to the prior art. It is obvious, the band being less hot, that the cooling equipment located at the end of line will be reduced by decreasing the size of the equipment and therefore its cost.
- the limitation of the oxidation obtained by the implementation of the method which is the subject of the invention makes it possible to limit the residence time of the strip under a reducing atmosphere, so again, to reduce the length of the line or decrease the hydrogen content of this zone where the reduction of the oxides takes place.
- the reduction of the oxidation of the band provided by the implementation of the method which is the subject of the invention makes it possible to improve the quality of the finished product, its surface state and the quality of the coating produced, for example on the galvanizing lines.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Coating With Molten Metal (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0002990 | 2000-03-08 | ||
FR0002990A FR2806097B1 (fr) | 2000-03-08 | 2000-03-08 | Perfectionnements apportes au prechauffage de bandes metalliques notamment dans des lignes de galvanisation ou de recuit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1134298A1 EP1134298A1 (fr) | 2001-09-19 |
EP1134298B1 true EP1134298B1 (fr) | 2007-10-10 |
Family
ID=8847875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01400142A Expired - Lifetime EP1134298B1 (fr) | 2000-03-08 | 2001-01-18 | Perfectionnements apportés au préchauffage de bandes métalliques notamment dans des lignes de galvanisation ou de recuit |
Country Status (10)
Country | Link |
---|---|
US (1) | US6761779B2 (pt) |
EP (1) | EP1134298B1 (pt) |
JP (1) | JP2001294941A (pt) |
KR (1) | KR100785255B1 (pt) |
CN (1) | CN1179056C (pt) |
AT (1) | ATE375408T1 (pt) |
DE (2) | DE60130823T2 (pt) |
ES (1) | ES2161660T3 (pt) |
FR (1) | FR2806097B1 (pt) |
PT (1) | PT1134298E (pt) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2852330B1 (fr) * | 2003-03-12 | 2007-05-11 | Stein Heurtey | Procede d'oxydation controlee de bandes avant galvanisation en continu et ligne de galvanisation |
DE102006005063A1 (de) * | 2006-02-03 | 2007-08-09 | Linde Ag | Verfahren zur Wärmebehandlung von Stahlbändern |
JP4718381B2 (ja) * | 2006-06-21 | 2011-07-06 | 株式会社神戸製鋼所 | 溶融亜鉛めっき設備 |
FR2917817B1 (fr) * | 2007-06-21 | 2016-05-27 | Stein Heurtey | Dispositif permettant de limiter l'echappement de fumees de combustion a l'entree d'un four de rechauffage de produits siderurgiques |
DE102008006248A1 (de) * | 2008-01-25 | 2009-07-30 | Schwartz, Eva | Vorrichtung und Verfahren zur Erwärmung von Werkstücken |
DE102009014223A1 (de) * | 2009-03-25 | 2010-09-30 | Hitachi Power Europe Gmbh | Feuerungssystem eines für den Oxyfuel-Betrieb ausgelegten Dampferzeugers |
CN103225016B (zh) * | 2013-04-27 | 2014-12-24 | 宝山钢铁股份有限公司 | 一种带钢表面火焰清洗方法及装置 |
AT517848B1 (de) * | 2016-04-15 | 2017-05-15 | Andritz Tech And Asset Man Gmbh | Verfahren und ofenanlage zum wärmebehandeln von metallbändern |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2009761B2 (de) * | 1970-03-03 | 1972-06-08 | Koppers-Wistra-Ofenbau GmbH, 4000 Düsseldorf | Kammerofen zur waermebehandlung von metallischem gut |
JPS5924166B2 (ja) * | 1977-10-20 | 1984-06-07 | 新日本製鐵株式会社 | ストリツプの連続加熱に於ける板温制御方法 |
JPS5672134A (en) * | 1979-11-17 | 1981-06-16 | Daido Steel Co Ltd | Control of heating furnace and its controlling device |
US4480992A (en) * | 1981-10-17 | 1984-11-06 | Sanken Sangyo Kabushiki Kaisha | Method of heating a furnace |
JPS5915725A (ja) * | 1982-07-17 | 1984-01-26 | Sanken Sangyo Kk | 炉の加熱法 |
JP2521386B2 (ja) * | 1991-10-31 | 1996-08-07 | 日本ファーネス工業株式会社 | 鉄鋼加熱炉 |
JPH06212285A (ja) * | 1993-01-19 | 1994-08-02 | Mitsubishi Heavy Ind Ltd | 焼鈍設備 |
JPH06287643A (ja) * | 1993-03-31 | 1994-10-11 | Mitsubishi Heavy Ind Ltd | 連続鋼板熱処理ラインの板温制御装置 |
TW265286B (pt) * | 1993-06-23 | 1995-12-11 | Gas Res Inst |
-
2000
- 2000-03-08 FR FR0002990A patent/FR2806097B1/fr not_active Expired - Fee Related
-
2001
- 2001-01-18 PT PT01400142T patent/PT1134298E/pt unknown
- 2001-01-18 DE DE60130823T patent/DE60130823T2/de not_active Expired - Lifetime
- 2001-01-18 DE DE1134298T patent/DE1134298T1/de active Pending
- 2001-01-18 AT AT01400142T patent/ATE375408T1/de active
- 2001-01-18 EP EP01400142A patent/EP1134298B1/fr not_active Expired - Lifetime
- 2001-01-18 ES ES01400142T patent/ES2161660T3/es not_active Expired - Lifetime
- 2001-03-02 US US09/796,355 patent/US6761779B2/en not_active Expired - Fee Related
- 2001-03-06 JP JP2001061648A patent/JP2001294941A/ja active Pending
- 2001-03-07 KR KR1020010011639A patent/KR100785255B1/ko not_active IP Right Cessation
- 2001-03-08 CN CNB011112328A patent/CN1179056C/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN1179056C (zh) | 2004-12-08 |
ES2161660T3 (es) | 2008-03-01 |
ATE375408T1 (de) | 2007-10-15 |
JP2001294941A (ja) | 2001-10-26 |
ES2161660T1 (es) | 2001-12-16 |
PT1134298E (pt) | 2007-10-24 |
FR2806097A1 (fr) | 2001-09-14 |
FR2806097B1 (fr) | 2002-05-10 |
KR100785255B1 (ko) | 2007-12-13 |
DE60130823D1 (de) | 2007-11-22 |
DE60130823T2 (de) | 2008-07-17 |
KR20010088418A (ko) | 2001-09-26 |
CN1315584A (zh) | 2001-10-03 |
EP1134298A1 (fr) | 2001-09-19 |
US20020162612A1 (en) | 2002-11-07 |
DE1134298T1 (de) | 2002-04-18 |
US6761779B2 (en) | 2004-07-13 |
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