EP0894150B1 - Haubenofen - Google Patents
Haubenofen 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
Links
- 238000001816 cooling Methods 0.000 claims abstract description 75
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 238000004320 controlled atmosphere Methods 0.000 claims 1
- 230000001681 protective effect Effects 0.000 abstract description 27
- 239000002184 metal Substances 0.000 abstract 2
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
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.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Electric Ovens (AREA)
Description
Claims (7)
- Haubenofen, insbesondere zum Glühen von Stahlblechbunden unter Schutzgas mit einer Schutzhaube (1), die die Stahlblechbunde umgibt,
mit einer Kühlhaube (2), die unter Bildung eines Zwischenraumes (3) die Schutzhaube (1) konzentrisch umgibt und die einen Kühlhaubenmantel und eine Kühlhaubendecke (5) aufweist, wobei die Kühlhaube (2) mit einer Vielzahl von Luftdüsen (7) versehen ist, derart, daß Kühlluft in Form von Prallstrahlen auf die Schutzhaube auftrifft, und mit mindestens einem Ventilator (6) zur Erzeugung einer Kühlluft-Strömung im Zwischenraum (3),
dadurch gekennzeichnet, daß sich der Düsenabstand (a) der Luftdüsen (7) im Kühlhaubenmantel von unten nach oben vergrößert, wobei der Düsenabstand (a) das 4- bis 12fache des Düsendurchmessers (d) beträgt, und daß der Düsenabstand (a) der Luftdüsen (7) in der Kühlhaubendecke das 4- bis 7fache des Düsendurchmessers (d) beträgt. - Haubenofen nach Anspruch 1,
dadurch gekennzeichnet, daß sich der Düsenabstand (a) der Luftdüsen (7) des Kühlhaubenmantels (4) von unten nach oben kontinuierlich vergrößert. - Haubenöfen nach einem der Ansprüche 1 bis 2,
dadurch gekennzeichnet, daß die Länge der Luftdüsen (7) des Kühlhaubenmantels das 5- bis 7fache des Düsendurchmessers (d) beträgt. - Haubenofen nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die Eintrittsöffnung der Luftdüsen (7) abgerundet ist. - Haubenofen nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß in Betriel die Geschwindigkeit der Kühlluft in den Luftdüsen (7) zwischen ca. 10 bis 40 m/s, vorzugsweise 15 bis 30 m/s beträgt. - Haubenofen nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß in Betriel die Geschwindigkeit der Kühlluft in den Luftdüsen (7) mindestens das 3-fache der Geschwindigkeitströmung der Kühlluft im Zwischenraum (3) beträgt. - Haubenofen nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, daß der obere Teil der Kühlhaube (2) einen größeren Außendurchmesser aufweist als der untere Teil.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19703305 | 1997-01-09 | ||
| DE19703305 | 1997-01-30 | ||
| PCT/EP1998/000246 WO1998033946A1 (de) | 1997-01-30 | 1998-01-17 | Haubenofen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0894150A1 EP0894150A1 (de) | 1999-02-03 |
| EP0894150B1 true EP0894150B1 (de) | 2002-05-15 |
Family
ID=7818731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98904091A Expired - Lifetime EP0894150B1 (de) | 1997-01-30 | 1998-01-17 | Haubenofen |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0894150B1 (de) |
| JP (1) | JP2000508716A (de) |
| AT (1) | ATE217651T1 (de) |
| BR (1) | BR9805962A (de) |
| DE (1) | DE19803259B4 (de) |
| EA (1) | EA000962B1 (de) |
| WO (1) | WO1998033946A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19847417C2 (de) * | 1998-10-14 | 2001-10-04 | Junker Gmbh O | Haubenofenanlage |
| DE29907320U1 (de) | 1999-04-26 | 1999-08-12 | Drever International S.A., Liègè | Vorrichtung zum Kühlen von Werkstoffen |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3433433C1 (de) * | 1984-09-12 | 1985-10-24 | Otto Junker Gmbh, 5107 Simmerath | Vorrichtung zum Erwaermen oder Kuehlen von metallischem Gut |
| DE3824415A1 (de) * | 1988-07-19 | 1990-01-25 | Gottfried Von Czarnowski | Kuehlhaube zum schnellen abkuehlen von gluehgut, insbesondere stahlband |
| AT396525B (de) * | 1992-03-20 | 1993-10-25 | Ebner Ind Ofenbau | Vorrichtung zum abkühlen der chargenschutzabdeckung von glühöfen |
| US5290017A (en) * | 1993-03-01 | 1994-03-01 | Indugas, Inc. | Cooling cover for batch coil annealing furnace |
| AT399775B (de) * | 1994-01-20 | 1995-07-25 | Ebner Ind Ofenbau | Vorrichtung zum abkühlen der chargenschutzabdeckung von glühöfen |
-
1998
- 1998-01-17 JP JP10532491A patent/JP2000508716A/ja active Pending
- 1998-01-17 EA EA199800880A patent/EA000962B1/ru not_active IP Right Cessation
- 1998-01-17 BR BR9805962-9A patent/BR9805962A/pt active Search and Examination
- 1998-01-17 WO PCT/EP1998/000246 patent/WO1998033946A1/de not_active Ceased
- 1998-01-17 EP EP98904091A patent/EP0894150B1/de not_active Expired - Lifetime
- 1998-01-17 AT AT98904091T patent/ATE217651T1/de not_active IP Right Cessation
- 1998-01-29 DE DE19803259A patent/DE19803259B4/de not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EA000962B1 (ru) | 2000-08-28 |
| EP0894150A1 (de) | 1999-02-03 |
| WO1998033946A1 (de) | 1998-08-06 |
| DE19803259B4 (de) | 2006-10-12 |
| DE19803259A1 (de) | 1998-08-06 |
| JP2000508716A (ja) | 2000-07-11 |
| ATE217651T1 (de) | 2002-06-15 |
| BR9805962A (pt) | 2000-01-25 |
| EA199800880A1 (ru) | 1999-04-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE60116702T2 (de) | Lufteinlass-Dämpfer-Strukturen für Turbine | |
| EP2312953B1 (de) | Backofen mit schwadenapparat | |
| EP0942792B1 (de) | Vorrichtung zur abkühlung von strangpressprofilen | |
| EP1130331B1 (de) | Verfahren und Vorrichtung zur Belüftung und Temperierung eines Raumes | |
| DE1814032B2 (de) | Haubengluehofen | |
| EP0894150B1 (de) | Haubenofen | |
| EP0315577B1 (de) | Brennerbeheiztes Gerät, insbesondere Wasserheizer | |
| EP1154024B1 (de) | Verfahren und Vorrichtung zur Wärmebehandlung metallischer Werkstücke | |
| DE69711360T2 (de) | Vorrichtung zum kühlen von raumluft | |
| EP0754768B1 (de) | Ofen zur Wärmebehandlung von Chargen metallischer Werkstücke | |
| DE29824816U1 (de) | Haubenofen | |
| DE19854910A1 (de) | Heizkessel | |
| DE2560496C2 (de) | Jalousien für Lufteintrittsöffnungen eines Luftkühlers | |
| DE10057427B4 (de) | Vorrichtung zur Tarnung von Schiffen | |
| EP4226109B1 (de) | Haubenglühofen und verfahren zum kühlen eines in einem haubenglühofen befindlichen glühguts | |
| EP0683361A2 (de) | Luftauslass | |
| DE10003997C2 (de) | Durchlüftete Backofentür | |
| DE2111785C3 (de) | Wärmebehandlungsofen | |
| DE29822930U1 (de) | Deckenluftdurchlaß für klimatechnische Anlagen | |
| DE19602184C2 (de) | Rollenherdvorspannofen mit Düsenrippen zur vornehmlich konvektiven Erwärmung von Glasscheiben | |
| AT396525B (de) | Vorrichtung zum abkühlen der chargenschutzabdeckung von glühöfen | |
| DE2721661C2 (de) | Heizvorrichtung fur einen Ofenraum eines Industrieofens | |
| EP0122413B1 (de) | Kaminhaube | |
| DE2934974A1 (de) | Infrarot-abschirmung fuer wasserfahrzeuge | |
| DE2857126A1 (de) | Backofen |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19980930 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE FR GB IT LU NL |
|
| 17Q | First examination report despatched |
Effective date: 20000830 |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE FR GB IT LU NL |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020515 Ref country code: GB Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20020515 |
|
| REF | Corresponds to: |
Ref document number: 217651 Country of ref document: AT Date of ref document: 20020615 Kind code of ref document: T |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
| NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
| ET | Fr: translation filed | ||
| GBV | Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed] |
Effective date: 20020515 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed |
Effective date: 20030218 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 20031231 Year of fee payment: 7 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050117 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20060113 Year of fee payment: 9 Ref country code: AT Payment date: 20060113 Year of fee payment: 9 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20060207 Year of fee payment: 9 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20070930 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070117 |
|
| BERE | Be: lapsed |
Owner name: *LOI THERMPROCESS G.M.B.H. Effective date: 20070131 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070131 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20070614 Year of fee payment: 10 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070131 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20080117 |