EP0894150B1 - Top hat furnace - Google Patents
Top hat furnace Download PDFInfo
- Publication number
- EP0894150B1 EP0894150B1 EP98904091A EP98904091A EP0894150B1 EP 0894150 B1 EP0894150 B1 EP 0894150B1 EP 98904091 A EP98904091 A EP 98904091A EP 98904091 A EP98904091 A EP 98904091A EP 0894150 B1 EP0894150 B1 EP 0894150B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling
- air
- nozzles
- hood
- air nozzles
- 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
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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
- C21D9/663—Bell-type furnaces
- C21D9/667—Multi-station furnaces
- C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere
-
- 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
- C21D9/663—Bell-type furnaces
- C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
-
- 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
- C21D1/84—Controlled slow cooling
Definitions
- the invention relates to a hood furnace, in particular for annealing steel sheet coils under protective gas with a protective hood that surrounds the steel sheet bundles with a cooling hood which concentrically forms the protective hood to form a space surrounds and which has a cooling hood jacket and a cooling hood ceiling, wherein the cooling hood is provided with a plurality of air nozzles such that cooling air occurs in the form of impact beams on the protective hood and with at least one fan to generate a cooling air flow in the space.
- Such hood furnaces are used in particular for bright annealing cold-rolled steel sheets used in the form of coils in a protective gas atmosphere.
- a hood furnace of the type mentioned is described in AT-B-396 525.
- the coils usually endure Convector panels separated one above the other.
- the volume flows through the Convector channels are significantly larger for the lower coils in the stack than for the uppermost ones Coils. It follows that underlying coils are preferred for cooling and overlying ones Coils are disadvantaged.
- the cooling process can only be ended when the Core of the uppermost coil the max. temperature is fallen short of, so that the cooling process takes a relatively long time.
- a cooling hood is known from WO 95/20058, in which only the lower Three-thirds of the air jets are arranged.
- the cooling effect is not optimal, since only in cooling takes place in the lower area.
- the task is accordingly a hood oven of the type mentioned to develop so that the cooling improves, in particular reduces the cooling time becomes.
- this object is achieved in that the nozzle spacing of the air nozzles enlarged from bottom to top, the nozzle spacing in Cooling hood jacket is 4 to 12 times the nozzle diameter and that the Nozzle spacing of the air nozzles in the cooling hood ceiling is 4 to 7 times the nozzle diameter is. It is structurally particularly simple if the nozzle spacing changes of the cooling hood jacket air nozzles is continuously enlarged from bottom to top.
- DE-C-3433433 describes a device for heating or cooling known metallic good, with the nozzles for a medium directly on the good surface are directed.
- the total cross section of the nozzle openings increases in the outflow direction of the medium. This is to ensure even heat transfer across the entire Good surface can be reached.
- the convective heat transfer on the side of the coil is determined by the volume flow of the circulating protective gas and the free interference cross section of the Annular gap between the protective hood and the coils. Because part of the shielding gas flow flows through the convector plates over the coil edges, which is used for heat transfer determining speed of the protective gas from bottom to top getting smaller. Therefore, according to the invention, the cooling effect on the protective hood is also increased the distance of the air nozzles in the cooling hood jacket from bottom to top reduced.
- the protective gas flow changes direction at the top of the protective hood, whereby the turbulence and thus the convective heat transfer to the cooling hood ceiling is significantly larger than that between the protective hood and the cooling hood jacket in the area of the vertical annular gap between the coil and the protective hood. additionally finds a significant exchange of radiation heat between the protective hood and the top coil edge instead. Therefore, the cooling hood ceiling with an additional To provide a variety of air nozzles in order to achieve intensive cooling here.
- the solution according to the invention has the advantage that the cooling of the coils is optimized, which shortens the cooling process.
- the drive power of the fan be relatively low can. Accordingly, the noise pollution is comparatively small.
- the hood furnace is characterized in that that the length of the air nozzles of the cooling hood jacket is 5 to 7 times the nozzle diameter is.
- This characteristic is based on the knowledge that a particularly cooling effect Impact jet occurs when a fully developed tube flow is created in the air nozzles.
- An advantageous embodiment is that the inlet opening of the air nozzles is rounded. This reduces pressure losses.
- the speed of the cooling air in the air nozzles between approx. 10 to 40 m / s, preferably 15 to 30 m / s.
- the speed of the cooling air in the air nozzles is advantageously at least 3 times the speed of the cooling air flow in the space.
- the Velocity of the vertical flow in the space must be relatively small in order to to achieve that the speed of the cooling air in all air nozzles in the cooling hood jacket is as large as possible.
- the width of the space is therefore as large as possible chosen.
- the upper part of the cooling hood can also have a larger outer diameter have than the lower part to the speed of the flow to reduce.
- the cooling hood 2 has a cylindrical cooling hood jacket 4 and a cooling hood cover 5 on.
- a fan 6 is laterally axial or radial Design arranged on the cooling hood jacket 4.
- the cooling hood jacket 4 is provided with air nozzles 7 over its entire height.
- the the bottom row of nozzles is located 300 - 600 mm above the protective hood flange.
- the nozzle distance a from the center of the air nozzle 7 to the center of an adjacent air nozzle 7 increases continuously from bottom to top. It is 4 to 12 times the Nozzle diameter d, which is 40 - 100 mm.
- Fig. 2 it is shown that in addition the cooling hood ceiling 5 with a variety of Air nozzles 7 is provided, the nozzle spacing a being 4 to 7 times the nozzle diameter d is.
- the uppermost part which is designed as a lace the protective hood 8 cooled intensively.
- the air nozzles 7 project radially inwards from the cylindrical cooling jacket surface 4.
- the length of the air nozzles 7 is 5 to 7 times the nozzle diameter.
- Fig. 3 is shown that the inlet openings of the air nozzles with the outer wall of the The cooling hood jacket is essentially flush and rounded in order to reduce pressure losses avoid.
- the speed of the cooling air in the air nozzles is between 10 to 40 m / s, preferably 15 to 30 m / s.
- the fan 6 draws cooling air through the intermediate space 3 and guides the heated air upwards.
- the inlet opening 9 to the fan 6 in the intermediate space 3 between The cooling hood 2 and protective hood 1 are rounded.
- the speed of the vertical Flow from bottom to top in space 3 is relatively small compared to that Speed of the cooling air in the air nozzles, at least three times the speed the flow of cooling air in the space 3 is.
- the baffle flow from the air nozzles with the cold one drawn in from the environment Air is highly effective for cooling, with the cooling effect decreasing from bottom to top.
- the flow of air from bottom to top in the space hardly contributes to it Cooling process, but only serves to warm the cooling air upwards dissipate.
- the upper part of the cooling hood 2 can have a larger outside diameter, than the lower part.
Abstract
Description
Die Erfindung betrifft einen Haubenofen, insbesondere zum Glühen von Stahlblechbunden unter Schutzgas mit einer Schutzhaube, die die Stahlblechbunde umgibt, mit einer Kühlhaube, die unter Bildung eines Zwischenraumes die Schutzhaube konzentrisch umgibt und die einen Kühlhaubenmantel und eine Kühlhaubendecke aufweist, wobei die Kühlhaube mit einer Vielzahl von Luftdüsen versehen ist, derart, daß Kühlluft in Form von Prallstrahlen auf die Schutzhaube auftritt und mit mindestens einem Ventilator zur Erzeugung einer Kühlluft-Strömung im Zwischenraum.The invention relates to a hood furnace, in particular for annealing steel sheet coils under protective gas with a protective hood that surrounds the steel sheet bundles with a cooling hood which concentrically forms the protective hood to form a space surrounds and which has a cooling hood jacket and a cooling hood ceiling, wherein the cooling hood is provided with a plurality of air nozzles such that cooling air occurs in the form of impact beams on the protective hood and with at least one fan to generate a cooling air flow in the space.
Derartige Haubenöfen werden insbesondere zum Blankglühen kaltgewalzter Stahlbleche in Form von Bunden sog. Coils in Schutzgasatmosphäre verwendet.Such hood furnaces are used in particular for bright annealing cold-rolled steel sheets used in the form of coils in a protective gas atmosphere.
Während des Glühprozesses befindet sich über der Schutzhaube eine Heizhaube. Nach dem Glühen wird die Heizhaube entfernt und durch eine Kühlhaube ersetzt.During the annealing process, there is a heating hood over the protective hood. After the annealing, the heating hood is removed and replaced by a cooling hood.
Ein Haubenofen der eingangs genannten Art ist in der AT-B-396 525 beschrieben. Über die ganze Höhe der Kühlhaube sind Luftdurchtrittsöffnungen für gegen die Schutzhaube gerichtete Prallstrahlen verteilt. Die Coils stehen üblicherweise durch Konvektorplatten getrennt übereinander. Die Volumenströme durch die Konvektorkanäle sind für die unteren Coils im Stapel deutlich größer als für die obersten Coils. Daraus erfolgt, daß unterliegende Coils beim Kühlen bevorzugt und oberliegende Coils benachteiligt werden. Der Kühlprozess kann erst beendet werden, wenn im Kern des obersten Coils die für das Kühlende festgelegte max. Temperatur unterschritten wird, so daß der Kühlprozess relativ lange dauert.A hood furnace of the type mentioned is described in AT-B-396 525. about the entire height of the cooling hood are air passage openings for against the Protective hood directed impact beams distributed. The coils usually endure Convector panels separated one above the other. The volume flows through the Convector channels are significantly larger for the lower coils in the stack than for the uppermost ones Coils. It follows that underlying coils are preferred for cooling and overlying ones Coils are disadvantaged. The cooling process can only be ended when the Core of the uppermost coil the max. temperature is fallen short of, so that the cooling process takes a relatively long time.
Aus der WO 95/20058 ist eine Kühlhaube bekannt, bei der ausschließlich im unteren Höhendrittel Luftdüsen angeordnet sind. Die Kühlwirkung ist nicht optimal, da nur im unteren Bereich eine Kühlung stattfindet.A cooling hood is known from WO 95/20058, in which only the lower Three-thirds of the air jets are arranged. The cooling effect is not optimal, since only in cooling takes place in the lower area.
Die Aufgabe besteht demgemäß darin, einen Haubenofen der eingangs genannten Art so weiterzubilden, daß die Kühlung verbessert, insbesondere die Kühldauer verringert wird.The task is accordingly a hood oven of the type mentioned to develop so that the cooling improves, in particular reduces the cooling time becomes.
Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß sich der Düsenabstand der Luftdüsen von unten nach oben vergrößert, wobei der Düsenabstand im Kühlhaubenmantel das 4- bis 12fache des Düsendurchmessers beträgt und daß der Düsenabstand der Luftdüsen in der Kühlhaubendecke das 4- bis 7fache des Düsendurchmessers beträgt. Es ist konstruktiv besonders einfach, wenn sich der Düsenabstand der Luftdüsen des Kühlhaubenmantels von unten nach oben kontinuierlich vergrößert.According to the invention, this object is achieved in that the nozzle spacing of the air nozzles enlarged from bottom to top, the nozzle spacing in Cooling hood jacket is 4 to 12 times the nozzle diameter and that the Nozzle spacing of the air nozzles in the cooling hood ceiling is 4 to 7 times the nozzle diameter is. It is structurally particularly simple if the nozzle spacing changes of the cooling hood jacket air nozzles is continuously enlarged from bottom to top.
Es besteht auch die Möglichkeit, den Düsendurchmesser von unten nach oben zu verkleinern. Allerdings ist diese Lösung konstruktiv aufwendig.There is also the option of reducing the nozzle diameter from bottom to top. However, this solution is structurally complex.
Aus der DE-C-3433433 ist eine Vorrichtung zum Erwärmen oder Kühlen von metallischem Gut bekannt, bei der Düsen für ein Medium direkt auf die Gutoberfläche gerichtet sind. Der Gesamtquerschnitt der Düsenöffnungen nimmt in Abströmrichtung des Mediums ab. Damit soll eine gleichmäßige Wärmeübertragung über die gesamte Gutoberfläche erreicht werden.DE-C-3433433 describes a device for heating or cooling known metallic good, with the nozzles for a medium directly on the good surface are directed. The total cross section of the nozzle openings increases in the outflow direction of the medium. This is to ensure even heat transfer across the entire Good surface can be reached.
Der konvektive Wärmeübergang an den Coil-Seitenflächen ist bestimmt durch den Volumenstrom des umgewälzten Schutzgases und dem freien Störmungsquerschnitt des Ringspaltes zwischen Schutzhaube und den Coils. Da ein Teil des Schutzgas-Stromes durch die Konvektorplatten über die Coilkanten strömt, wird die für den Wärmeübergang bestimmende Geschwindigkeit des Schutzgases von unten nach oben immer kleiner. Daher wird erfindungsgemäß auch die Kühlwirkung auf die Schutzhaube durch Vergrößerung des Abstandes der Luftdüsen im Kühlhaubenmantel von unten nach oben verringert.The convective heat transfer on the side of the coil is determined by the volume flow of the circulating protective gas and the free interference cross section of the Annular gap between the protective hood and the coils. Because part of the shielding gas flow flows through the convector plates over the coil edges, which is used for heat transfer determining speed of the protective gas from bottom to top getting smaller. Therefore, according to the invention, the cooling effect on the protective hood is also increased the distance of the air nozzles in the cooling hood jacket from bottom to top reduced.
Die Schutzgas-Strömung ändert an der obersten Stelle der Schutzhauben ihre Richtung, wodurch die Turbulenz und damit der konvektive Wärmeübergang zur Kühlhaubendecke deutlich größer ist als derjenige zwischen Schutzhaube und Kühlhaubenmantel im Bereich des vertikalen Ringspalt zwischen Coil und der Schutzhaube. Zusätzlich findet ein nennenswerter Stahlungswärme-Austausch zwischen Schutzhaube und der obersten Coilkante statt. Daher ist zusätzlich die Kühlhaubendecke mit einer Vielzahl von Luftdüsen zu versehen, um hier eine intensive Kühlung zu erreichen.The protective gas flow changes direction at the top of the protective hood, whereby the turbulence and thus the convective heat transfer to the cooling hood ceiling is significantly larger than that between the protective hood and the cooling hood jacket in the area of the vertical annular gap between the coil and the protective hood. additionally finds a significant exchange of radiation heat between the protective hood and the top coil edge instead. Therefore, the cooling hood ceiling with an additional To provide a variety of air nozzles in order to achieve intensive cooling here.
Die erfindungsgemäße Lösung hat den Vorteil, daß die Kühlung der Coils optimiert wird, wodurch sich der Kühlprozeß verkürzt.The solution according to the invention has the advantage that the cooling of the coils is optimized, which shortens the cooling process.
Vorteilhaft ist weiterhin, daß die Antriebsleistung des Ventilators relativ gering sein kann. Dementsprechend ist die Lärmbelastung vergleichsweise klein. It is also advantageous that the drive power of the fan be relatively low can. Accordingly, the noise pollution is comparatively small.
Nach einem weiteren Merkmal der Erfindung ist der Haubenofen dadurch gekennzeichnet, daß die Länge der Luftdüsen des Kühlhaubenmantels das 5- bis 7-fache des Düsendurchmessers beträgt.According to a further feature of the invention, the hood furnace is characterized in that that the length of the air nozzles of the cooling hood jacket is 5 to 7 times the nozzle diameter is.
Diesem Merkmal liegt die Erkenntnis zugrunde, daß ein besonders kühlwirksamer Prallstrahl entsteht, wenn in den Luftdüsen eine voll ausgebildete Rohrströmung entsteht.This characteristic is based on the knowledge that a particularly cooling effect Impact jet occurs when a fully developed tube flow is created in the air nozzles.
Eine vorteilhafte Ausgestaltung besteht darin, daß die Eintrittsöffnung der Luftdüsen abgerundet ist. Dadurch werden Druckverluste verringert.An advantageous embodiment is that the inlet opening of the air nozzles is rounded. This reduces pressure losses.
Nach einem weiteren Merkmal beträgt die Geschwindigkeit der Kühlluft in den Luftdüsen zwischen ca. 10 bis 40 m/s, vorzugsweise 15 bis 30 m/s. According to another characteristic the speed of the cooling air in the air nozzles between approx. 10 to 40 m / s, preferably 15 to 30 m / s.
Vorteilhafterweise beträgt die Geschwindigkeit der Kühlluft in den Luftdüsen mindestens das 3fache der Geschwindigkeit der Strömung der Kühlluft im Zwischenraum. Die Geschwindigkeit der vertikalen Strömung im Zwischenraum muß relativ klein sein, um zu erreichen, daß die Geschwindigkeit der Kühlluft in allen Luftdüsen im Kühlhaubenmantel möglichst gleich groß ist. Die Breite des Zwischenraums wird daher so groß wie möglich gewählt. Der obere Teil der Kühlhaube kann außerdem einen größeren Außendurchmesser aufweisen, als der untere Teil, um die Geschwindigkeit der Strömung zu reduzieren.The speed of the cooling air in the air nozzles is advantageously at least 3 times the speed of the cooling air flow in the space. The Velocity of the vertical flow in the space must be relatively small in order to to achieve that the speed of the cooling air in all air nozzles in the cooling hood jacket is as large as possible. The width of the space is therefore as large as possible chosen. The upper part of the cooling hood can also have a larger outer diameter have than the lower part to the speed of the flow to reduce.
Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispiels im Zusammenhang mit der beiliegenden Zeichnung näher erläutert.The invention is described below with reference to a preferred embodiment Connection with the accompanying drawing explained.
Die Zeichnung zeigt in,
In dem Haubenofen nach Fig. 1 werden unter einer Schutzhaube 1 nicht dargestellte
Stahlblechbunde unter Schutzgas geglüht. Die dabei über die Schutzhaube gestülpte
Heizhaube ist ebenfalls nicht dargestellt. Nach Beendigung des Glühprozesses wird die
Heizhaube durch eine Kühlhaube 2 ersetzt, die unter Bildung eines Zwischenraumes 3
die Schutzhaube 1 konzentrisch umgibt.1 are not shown under a
Die Kühlhaube 2 weist einen zylindrischen Kühlhaubenmantel 4 und eine Kühlhaubendecke
5 auf. An dem Kühlhaubenmantel 4 ist seitlich ein Ventilator 6 axialer oder radialer
Bauart angeordnet.The
Der Kühlhaubenmantel 4 ist über seine gesamte Höhe mit Luftdüsen 7 versehen. Die
unterste Düsenreihe ist 300 - 600 mm über dem Schutzhauben-Flansch angebracht.
Der Düsenabstand a von Mitte Luftdüse 7 zur Mitte einer benachbarten Luftdüse 7
vergrößert sich von unten nach oben kontinuierlich. Er beträgt das 4- bis 12-fache des
Düsendurchmessers d, der 40 - 100 mm beträgt.The
In Fig. 2 ist dargestellt, daß zusätzlich die Kühlhaubendecke 5 mit einer Vielzahl von
Luftdüsen 7 versehen ist, wobei der Düsenabstand a das 4- bis 7-fache des Düsendurchmessers
d beträgt. Dadurch wird der als Klöpperboden ausgebildete oberste Teil
der Schutzhaube 8 intensiv gekühlt.In Fig. 2 it is shown that in addition the
Die Luftdüsen 7 ragen von der zylindrischen Kühlmantelfläche 4 aus radial nach innen.
Die Länge der Luftdüsen 7 beträgt das 5- bis 7-fache des Düsendurchmessers. in Fig.
3 ist dargestellt, daß die Eintrittsöffnungen der Luftdüsen mit der Außenwand des
Kühlhaubenmantels im wesentlichen bündig und abgerundet sind, um Druckverluste zu
vermeiden.The
Die Geschwindigkeit der Kühlluft in den Luftdüsen beträgt zwischen 10 bis 40 m/s, vorzugsweise 15 bis 30 m/s.The speed of the cooling air in the air nozzles is between 10 to 40 m / s, preferably 15 to 30 m / s.
Der Ventilator 6 saugt Kühlluft durch den Zwischenraum 3 und führt die erwärmte Luft
nach oben ab. Die Einlauföffnung 9 zum Ventilator 6 im Zwischenraum 3 zwischen
Kühlhaube 2 und Schutzhaube 1 ist abgerundet. Die Geschwindigkeit der vertikalen
Strömung von unten nach oben im Zwischenraum 3 ist relativ klein, verglichen mit der
Geschwindigkeit der Kühlluft in den Luftdüsen, die mindestens das dreifache der Geschwindigkeit
der Strömung der Kühlluft im Zwischenraum 3 beträgt.The
Die Prallströmung aus den Luftdüsen mit der aus der Umgebung angesaugten kalten Luft ist für die Kühlung hochwirksam, wobei die Kühlwirkung von unten nach oben abnimmt. Die Strömung der Luft von unten nach oben im Zwischenraum trägt kaum zum Kühlprozeß bei, sondern dient lediglich dazu, die sich erwärmende Kühlluft nach oben abzuführen.The baffle flow from the air nozzles with the cold one drawn in from the environment Air is highly effective for cooling, with the cooling effect decreasing from bottom to top. The flow of air from bottom to top in the space hardly contributes to it Cooling process, but only serves to warm the cooling air upwards dissipate.
Im Rahmen der Erfindung sind ohne weiteres Abwandlungsmöglichkeiten gegeben. So
kann der obere Teil der Kühlhaube 2 einen größeren Außendurchmesser aufweisen,
als der untere Teil.Within the scope of the invention, modification options are readily available. So
the upper part of the
Claims (7)
- Top hat furnace, in particular for annealing steel plate bundles under a controlled atmosphere with an inner cover (1) surrounding the steel plate bundles, with a a cooling cover (2) concentrically surrounding the inner cover (1) and forming an intermediate space (3) therewith and having a cooling cover jacket and a cooling cover roof (5), the cooling cover (2) being provided with a plurality of air nozzles (7) so that the cooling air hits the inner cover in the form of impinged jets, and with at least one fan (6) to generate a flow of cooling air in the intermediate space (3),
characterised in that
the distance (a) between the air nozzles (7) in the cooling cover jacket becomes greater from bottom to top, the distance between the nozzles (a) being 4 to 12 times the nozzle diameter (d) and that the distance (a) between the air nozzles (7) in the cooling cover roof is 4 to 7 times the nozzle diameter (d). - Top hat furnace according to claim 1,
characterised in that
the distance (a) between the air nozzles (7) of the cooling cover jacket (4) progressively increases from bottom to top. - Top hat furnace according to any one of claims 1 through 2,
characterised in that
the length of the air nozzles (7) of the cooling cover jacket is 5 to 7 times the nozzle diameter (d). - Top hat furnace according to any one of claims 1 through 3,
characterised in that
the inlet orifice of the air nozzles (7) is rounded. - Top hat furnace according to any one of claims 1 through 4,
characterised in that,
during operation, the velocity of the cooling air in the air nozzles (7) is between approx. 10 and 40 m/s, preferably 15 and 30 m/s. - Top hat furnace according to any one of claims 1 through 5,
characterised in that,
during operation, the velocity of the cooling air in the air nozzles (7) is at least 3 times the flow rate of the cooling air in the intermediate space (3). - Top hat furnace according to any one of claims 1 through 6,
characterised in that
the top part of the cooling cover (2) has a larger outside diameter than the bottom part.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19703305 | 1997-01-30 | ||
| DE19703305 | 1997-01-30 | ||
| PCT/EP1998/000246 WO1998033946A1 (en) | 1997-01-30 | 1998-01-17 | Top hat furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0894150A1 EP0894150A1 (en) | 1999-02-03 |
| EP0894150B1 true EP0894150B1 (en) | 2002-05-15 |
Family
ID=7818731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98904091A Expired - Lifetime EP0894150B1 (en) | 1997-01-30 | 1998-01-17 | Top hat furnace |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0894150B1 (en) |
| JP (1) | JP2000508716A (en) |
| AT (1) | ATE217651T1 (en) |
| BR (1) | BR9805962A (en) |
| DE (1) | DE19803259B4 (en) |
| EA (1) | EA000962B1 (en) |
| WO (1) | WO1998033946A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19847417C2 (en) * | 1998-10-14 | 2001-10-04 | Junker Gmbh O | Bell furnace system |
| DE29907320U1 (en) | 1999-04-26 | 1999-08-12 | Drever Int Sa | Device for cooling materials |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3433433C1 (en) * | 1984-09-12 | 1985-10-24 | Otto Junker Gmbh, 5107 Simmerath | Device for heating or cooling metallic goods |
| DE3824415A1 (en) * | 1988-07-19 | 1990-01-25 | Gottfried Von Czarnowski | Cooling hood for rapid cooling of red-hot material, in particular steel strip |
| AT396525B (en) * | 1992-03-20 | 1993-10-25 | Ebner Ind Ofenbau | Device for cooling the charge-protecting cover of annealing furnaces |
| US5290017A (en) * | 1993-03-01 | 1994-03-01 | Indugas, Inc. | Cooling cover for batch coil annealing furnace |
| AT399775B (en) * | 1994-01-20 | 1995-07-25 | Ebner Ind Ofenbau | DEVICE FOR COOLING THE BATCH PROTECTIVE COVER OF TUBES |
-
1998
- 1998-01-17 BR BR9805962-9A patent/BR9805962A/en active Search and Examination
- 1998-01-17 WO PCT/EP1998/000246 patent/WO1998033946A1/en active IP Right Grant
- 1998-01-17 EA EA199800880A patent/EA000962B1/en not_active IP Right Cessation
- 1998-01-17 JP JP10532491A patent/JP2000508716A/en active Pending
- 1998-01-17 EP EP98904091A patent/EP0894150B1/en not_active Expired - Lifetime
- 1998-01-17 AT AT98904091T patent/ATE217651T1/en not_active IP Right Cessation
- 1998-01-29 DE DE19803259A patent/DE19803259B4/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| BR9805962A (en) | 2000-01-25 |
| DE19803259B4 (en) | 2006-10-12 |
| EA199800880A1 (en) | 1999-04-29 |
| JP2000508716A (en) | 2000-07-11 |
| WO1998033946A1 (en) | 1998-08-06 |
| EA000962B1 (en) | 2000-08-28 |
| ATE217651T1 (en) | 2002-06-15 |
| DE19803259A1 (en) | 1998-08-06 |
| EP0894150A1 (en) | 1999-02-03 |
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