EP2507400A1 - Dispositif pour maintenir seche l'atmosphere d'un four de recuit pour bande metallique, et four equipe de ce dispositif. - Google Patents
Dispositif pour maintenir seche l'atmosphere d'un four de recuit pour bande metallique, et four equipe de ce dispositif.Info
- Publication number
- EP2507400A1 EP2507400A1 EP10790876A EP10790876A EP2507400A1 EP 2507400 A1 EP2507400 A1 EP 2507400A1 EP 10790876 A EP10790876 A EP 10790876A EP 10790876 A EP10790876 A EP 10790876A EP 2507400 A1 EP2507400 A1 EP 2507400A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- strip
- knives
- atmosphere
- furnace
- 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
- 239000012298 atmosphere Substances 0.000 title claims abstract description 52
- 238000000137 annealing Methods 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 79
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 11
- 238000004064 recycling Methods 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000003570 air Substances 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/565—Sealing arrangements
-
- 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
- F27D99/0073—Seals
- F27D99/0075—Gas curtain seals
Definitions
- the invention relates to a device for keeping the atmosphere of a metal strip annealing furnace dry, in particular a fast heating annealing furnace for carbon steel strip and a bright annealing furnace for stainless steel band.
- a carbon steel annealing furnace it may also be necessary to maintain a very reducing atmosphere in the furnace, especially when the residence time of the strip in the furnace is low. This is for example the case for fast heating furnaces, especially by induction.
- a high hydrogen content in the furnace atmosphere for example 75% to 100%, makes it possible to reduce any oxides present on the strip despite the low residence time at temperature.
- H 2 O pollution of the atmosphere present inside the furnace is the metal strip itself. It travels at high speeds, for example between 60 mpm (meters per minute) and 800 mpm. The water present on the surface of the strip and resulting from the humidity of the external environment of the oven is thus driven into the oven.
- Very low values of H 2 O entrained by the strip have a significant impact on the dew point degradation in the furnace.
- a residual water thickness of 0.018 ⁇ (micrometer) per strip face over a 1350 mm wide band flowing in a furnace with a volume of 650 m3 at a speed of 80 mpm requires a gas renewal of oven atmosphere close to 800 Nm3 / h in order to maintain the atmosphere of the oven at a dew point of -40 ° C by injecting an atmosphere gas with an H 2 O content corresponding to a dew point equal to -70 ° C.
- the atmosphere gas injected into the furnace is composed of a mixture of hydrogen and nitrogen with a high hydrogen concentration, typically between 75% and 100%.
- a high hydrogen concentration typically between 75% and 100%.
- the means used today to compensate for this pollution coming from the strip is a dilution of the atmosphere present in the oven with a very dry gas coming directly from the network of the installation. This results in a direct consumption of hydrogen and nitrogen for the operator of the installation.
- This means may be coupled with an atmosphere recycling device composed of a recirculation loop of the furnace gas gas in which the gas is dried before being reinjected into the furnace.
- 400 Nm3 / h will be taken on the network of the plant in direct consumption and 400 Nm3 / h will be recirculated via this loop of recycling of the atmosphere gas.
- the furnace comprises two atmosphere separation systems for separating the atmosphere present in the furnace from the ambient air.
- the first is placed at the entrance of the band in the oven, the second at its exit.
- the furnace comprises a "buffer chamber" maintained under 100% nitrogen.
- the oven thus comprises two atmosphere separation systems at the inlet and at the outlet of the oven separating the air / nitrogen atmospheres and two intermediate atmosphere separation systems making it possible to separate the nitrogen / atmosphere environments H2-N2 from the oven.
- the invention aims, above all, to provide a device for maintaining, in a annealing furnace of a metal strip, a very dry atmosphere with a reduced consumption of gas, and therefore a reduced operating cost.
- the device for keeping the atmosphere of a metal strip annealing furnace dry is characterized in that it comprises means capable of reducing the presence of water on the strip before entering the furnace.
- these means comprising, at the furnace inlet, at least one gas knife per strip face, fed with a dry gas whose dew point is between -40 ° C and -70 ° C, and producing a jet of gas impinging the surface of the strip over its entire width so as to take off the moisture on the surface of the strip,
- the gas knives are implanted in a sealed enclosure containing a gas having a dew point maintained between -40 ° C and -70 ° C, this chamber being isolated on the one hand from the external environment of the furnace and on the other hand, the furnace atmosphere by means of atmosphere separation systems.
- knife gas is meant a gas blowing device producing a jet of gas impinging the surface of the strip over its entire width to take off the surface moisture or trapped in the pores of the strip.
- the gas knives produce a straight or chevron gas jet.
- this gas can, for example, be generated by a compressor / booster assembly and a gas dryer. Preheating of the gas can be done but it is not necessary for standard applications.
- the number of gas knives, the feed pressures of these knives, the gas flow rates, the jet velocities and the distance between the knives and the web depend on the speed of circulation of the web.
- the gas knives can be fed via a loop for recycling the atmosphere present in the enclosure comprising a dryer reducing the gas taken from the chamber to the required dew point.
- the sealed enclosure thus has the advantage of allowing the blown gas to be recirculated on the strip, which limits the size of the gas drying equipment.
- the gas blown on the strip and the resulting atmosphere in the sealed chamber may be an inert gas, including nitrogen.
- the enclosure is in an inert atmosphere, including nitrogen, allows a buffer volume of gas that in the case where it is drawn into the oven, does not generate any risk.
- Inert gas knives also break the plume of air volume entrained in the furnace by tape scrolling.
- support rollers of the band are present in the vicinity of the gas knives in order to give a stable pass line to the band, which makes it possible to bring the knives as close to gas from the band. Indeed, the more the gas knives are close to the band and the more the detachment of the moisture present on the surface of the band will be effective.
- the gas knives may be inclined in the opposite direction of the tape travel so as to reinforce their efficiency by a flow of gas against the current relative to the running of the strip.
- the gas blowing flow rate can be between 1000 and 4000 Nm3 / h for a pressure of 200 mbar at 5 bar.
- the distance between the exit orifice of the knives for the gas and the strip may especially be between 10 and 100 mm.
- the gas knives are advantageously mounted on mobile systems for adjusting the distance between the knives and the band.
- the means capable of reducing the presence of water on the strip comprise, at the furnace inlet, a device for heating the strip so as to take off, by evaporation, the moisture on the surface Of the band.
- the heating device is advantageously implanted in a sealed enclosure, containing a dry gas whose dew point is maintained at values between -40 ° C and -70 ° C, isolated on the one hand from the external atmosphere of the oven and on the other hand the furnace atmosphere by atmosphere separation systems.
- the heating of the band is advantageously carried out by a rapid heating device allowing heat transfer over a short strip length, for example induction heating or shortwave infrared heating.
- the band is quickly brought to a temperature allowing evaporation of the water. This temperature is nevertheless limited to be compatible with the materials used by the atmosphere separation systems.
- the strip is for example brought to a temperature of 150 to 200 ° C.
- the heating of the strip produced according to the invention contributes to the overall heating of the strip necessary for it to reach the annealing temperature.
- the additional energy consumption induced by the invention is therefore limited.
- the sealed enclosure in which is placed the heating device according to the invention may be equipped with a loop for recycling the atmosphere present in the enclosure comprising a dryer reducing the gas taken from the enclosure to the required dew point .
- the invention provides many advantages. Since the moisture dragged by the belt is an important source of pollution of the furnace, the fact that removing or minimizing the amount of H 2 O entrained in the furnace can significantly reduce the atmospheric gas consumption.
- the device according to the invention makes it possible to reduce the capacity of this recycling loop thus making it possible to minimize the investment cost of the installation.
- the rate of renewal of the oven atmosphere gas will be close to 400 Nm3 / h in order to maintain the oven atmosphere at a dew point of -40 ° C and this, by injecting a an atmosphere gas with an H 2 O content corresponding to a dew point of -70 ° C.
- the device according to the invention thus allows:
- the device according to the invention also makes it possible to obtain a lower dew point with atmospheric gas consumptions equivalent to those of an installation with a higher dew point, which does not have this device.
- the invention also relates to a metal strip annealing furnace equipped with a device for maintaining the oven atmosphere dry, as defined above.
- FIG. 1 is a partial vertical diagrammatic section of the inlet of a metal strip annealing furnace equipped with a device according to the invention
- Fig.2 is a vertical schematic section, on a larger scale, illustrating the effect of gas knives on the metal strip.
- a device S for maintaining the dry atmosphere of a annealing furnace 1 for metal strip 2.
- the device S is placed at the entrance of the annealing furnace 1 operating under a high hydrogen content atmosphere (between 75% and 100%) and under a dew point below -40 ° C.
- the band 2 moves vertically from bottom to top.
- the direction of movement of the band could be reversed; in addition the tape could move horizontally or obliquely.
- the device S comprises means M capable of reducing the presence of water on the strip 2.
- the means M comprise an inert enclosure C under a nitrogen atmosphere, and are placed between an atmosphere separation system A, in input of the device S, for separating the ambient air from the nitrogen present in the inert enclosure C and an atmosphere separation system B at the outlet of the device S separating nitrogen from the furnace atmosphere.
- the device S is composed of:
- the sealed enclosure C constituting an inert zone in which the atmosphere is maintained at 100% nitrogen with a dew point less than or equal to -40 ° C, one or more pairs of nitrogen knives D
- a nitrogen recirculation circuit comprising an extraction E, a compressor or booster F and a nitrogen drying unit G, - Rollers H, upstream and downstream of the knives D, to maintain a stable line of pass.
- Each gas knife D is formed by a converging blow nozzle 3 (FIG. 2), the outlet orifice 4 of which consists of a slot extending over the entire width of the strip.
- the sizing of the recirculation circuit as well as the number of pairs of knives depends on the characteristics of the line (bandwidth and desired dew point in the furnace).
- the number of knives D can be limited to one pair. Two pairs or more may also be needed.
- the gas knives D are advantageously inclined in opposite directions of the running of the strip 2 so as to reinforce their efficiency by a flow of the gas against the current relative to the running of the strip.
- the blowing flow rate is advantageously between 1000 and 4000 Nm3 / h for a pressure of 200 mbar at 5 bar.
- D knives Different technologies of D knives can be used depending on the desired efficiency. For example high pressure knives (between 2 and 5 bar and a flow rate of 1000 to 2000 Nm3 / h) or low pressure knives (between 200 and 400 mbar and a flow rate of 2500 to 4000 Nm3 / h).
- high pressure knives between 2 and 5 bar and a flow rate of 1000 to 2000 Nm3 / h
- low pressure knives between 200 and 400 mbar and a flow rate of 2500 to 4000 Nm3 / h.
- the high pressure solution is more efficient but more expensive and consumes more energy.
- Fig. 2 illustrates schematically the effect of the gas jets of the knives D on the residual water at the surface of the strip 2, or in the porosities thereof.
- the impact of the gas jets on the band detaches the layer of residual water that is evacuated with the gas.
- the distance between the outlet orifice 4 of the knives D for the gas and the strip 2 is preferably between 10 and 100 mm. The shorter the distance, the more efficient the system. To reduce this distance, rollers H can be installed, on either side of the band 2, in order to stabilize the band pass line and thus allow to bring the knives D of the band 2 as close as possible.
- the knives D are mounted on mobile systems for adjusting the distance between the knives and the band.
- the means adapted to reduce the presence of water on the strip may comprise, at the furnace inlet, a heating device (not shown) of the strip so as to take off by evaporation the moisture in surface of the band, replacing the gas knives.
- Residual water thickness on the strip before the gas knives 0.018 ⁇ per strip face
- Length L1 of the sealed enclosure 2500 mm
- Diameter of rollers H of support 250 mm
- This example of application of a device according to the invention makes it possible to limit the thickness of residual water on the strip after the gas knives to 0.009 ⁇ per strip face. This makes it possible to limit the rate of renewal of the oven atmosphere gas to 400 Nm3 / h by maintaining the dew point of the oven atmosphere at -40 ° C.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0905751A FR2953221B1 (fr) | 2009-11-30 | 2009-11-30 | Dispositif pour maintenir seche l'atmosphere d'un four de recuit pour bande metallique, et four equipe de ce dispositif |
PCT/IB2010/055422 WO2011064732A1 (fr) | 2009-11-30 | 2010-11-25 | Dispositif pour maintenir seche l'atmosphere d'un four de recuit pour bande metallique, et four equipe de ce dispositif. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2507400A1 true EP2507400A1 (fr) | 2012-10-10 |
EP2507400B1 EP2507400B1 (fr) | 2014-01-08 |
Family
ID=42320215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10790876.6A Active EP2507400B1 (fr) | 2009-11-30 | 2010-11-25 | Dispositif pour maintenir seche l'atmosphere d'un four de recuit pour bande metallique, et four equipe de ce dispositif. |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2507400B1 (fr) |
FR (1) | FR2953221B1 (fr) |
WO (1) | WO2011064732A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109990569B (zh) * | 2019-04-09 | 2020-08-11 | 中冶赛迪工程技术股份有限公司 | 一种基于降温除湿的退火炉烘干方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5534645A (en) * | 1978-08-31 | 1980-03-11 | Kawasaki Steel Corp | Continuous annealing furnace |
JPS5993840A (ja) * | 1982-11-19 | 1984-05-30 | Kawasaki Steel Corp | 鋼帯連続熱処理炉の鋼帯出入口のガスシ−ル方法 |
JPS60238425A (ja) * | 1984-05-09 | 1985-11-27 | Daido Steel Co Ltd | ガスシ−ル装置 |
JPH075997B2 (ja) * | 1986-10-06 | 1995-01-25 | 川崎製鉄株式会社 | 無酸化炉の炉口高温ガスシール装置 |
JP2905441B2 (ja) * | 1996-06-24 | 1999-06-14 | 中外炉工業株式会社 | 横型金属ストリップ連続焼鈍炉のシール装置 |
DE19634693C2 (de) * | 1996-08-28 | 2000-09-28 | Mat Gmbh Maschinen Anlagen Tec | Verfahren und Vorrichtung zur Reduzierung bzw. zur Vermeidung des Luft- bzw. Gasaustausches im Bereich temperaturmäßig unterschiedlicher Zonen |
JP2003129125A (ja) * | 2001-10-15 | 2003-05-08 | Daido Steel Co Ltd | ストリップ連続熱処理炉 |
FR2903122B1 (fr) * | 2006-06-30 | 2008-09-12 | Stein Heurtey | Dispositif de securisation d'un four equipe d'un chauffage et d'un refroidissement rapides fonctionnant sous atmosphere controlee. |
-
2009
- 2009-11-30 FR FR0905751A patent/FR2953221B1/fr not_active Expired - Fee Related
-
2010
- 2010-11-25 WO PCT/IB2010/055422 patent/WO2011064732A1/fr active Application Filing
- 2010-11-25 EP EP10790876.6A patent/EP2507400B1/fr active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2011064732A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2507400B1 (fr) | 2014-01-08 |
FR2953221B1 (fr) | 2013-06-14 |
WO2011064732A1 (fr) | 2011-06-03 |
FR2953221A1 (fr) | 2011-06-03 |
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