EP4226109A1 - Haubenglühofen und verfahren zum kühlen eines in einem haubenglühofen befindlichen glühguts - Google Patents
Haubenglühofen und verfahren zum kühlen eines in einem haubenglühofen befindlichen glühgutsInfo
- Publication number
- EP4226109A1 EP4226109A1 EP21777975.0A EP21777975A EP4226109A1 EP 4226109 A1 EP4226109 A1 EP 4226109A1 EP 21777975 A EP21777975 A EP 21777975A EP 4226109 A1 EP4226109 A1 EP 4226109A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling gas
- base
- cooling
- hood
- bell
- 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
- 238000000137 annealing Methods 0.000 title claims abstract description 96
- 239000000463 material Substances 0.000 title claims abstract description 31
- 238000001816 cooling Methods 0.000 title claims description 43
- 238000000034 method Methods 0.000 title claims description 11
- 239000000112 cooling gas Substances 0.000 claims abstract description 145
- 230000001681 protective effect Effects 0.000 claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 238000004891 communication Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 4
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- F27D9/00—Cooling of furnaces or of charges therein
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
-
- 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
- C21D9/0043—Muffle furnaces; Retort furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B11/00—Bell-type furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases, or liquids
-
- 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
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/0005—Cooling of furnaces the cooling medium being a gas
-
- 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
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/007—Cooling of charges therein
- F27D2009/0072—Cooling of charges therein the cooling medium being a gas
- F27D2009/0078—Cooling of charges therein the cooling medium being a gas in indirect contact with the charge
Definitions
- the invention relates to a bell-type annealing furnace for annealing annealing material, having at least one base, which has at least one storage space on which at least one charge of the annealing material can be arranged, at least one protective hood, with which the annealing material arranged on the storage space is protected by forming a through the protective hood and the parking space enclosed by the glow chamber can be covered, at least one heating hood with which the protective hood can be covered, forming an intermediate space which is arranged between the heating hood and the protective hood and is delimited on the bottom by the base, and at least one cooling gas system which is or can be connected in a communicating manner to the intermediate space.
- the invention also relates to a method for cooling an item to be annealed in a batch-type annealing furnace using a cooling gas which is used to cool the item to be annealed by a between a protective hood of the batch-type annealing furnace, with which the annealing material arranged on a parking space of a base of the batch-type annealing furnace, forming a through the protective hood and the parking space enclosed annealing chamber is covered, and a heating hood of the bell-type annealing furnace, with which the protective hood is covered, is guided through a space delimited on the bottom side by the base.
- Bell-type annealing furnaces are used, for example, for the high-temperature annealing of grain-oriented electrical steel, in which the electrical steel is annealed at very high temperatures between 1100 °C and 1200 °C.
- the grain-oriented electrical strip is usually introduced in batches into a bell-type annealing furnace, with a batch being able to be formed, for example, by electrical strip wound into a coil or by a stack of such coils.
- a grain-oriented electrical strip can be used, for example, to produce an iron core or a wound core for an electrical machine, for example a transformer or a generator.
- DE 10 2012 221 511 A1 discloses a cooling hood for a hood furnace for cooling down annealing material previously heated with a heating hood, which is arranged inside a protective hood of the hood furnace for heating and cooling.
- the cooling hood has a cooling hood body for placing over the protective hood, a cooling gas feed opening in the cooling hood body for feeding cooling gas into an intermediate space between protective hood and cooling hood body, a cooling gas outlet opening in the cooling hood body for discharging supplied cooling gas from the intermediate space, a closing device for selective closing or at least partially Opening the cooling gas outlet opening and a ventilation device for ventilating the cooling gas between the cooling gas supply opening and the cooling gas outlet opening.
- EP 2 486 157 B1 discloses a bell annealing furnace for the high-temperature annealing of metal strip, sheet metal or wire, in particular grain-oriented electrical steel in the form of coils in an annealing chamber under protective gas or in a protective gas atmosphere in a bell annealer.
- the bell-type annealing furnace has a hearth with at least one position for a charge in the form of a coil or a coil stack, at least one protective hood that covers the charge and under which the annealing chamber is formed, a dynamic seal between the protective hood and the hearth, and the protective hood heating hood surrounded by a distance, under which a heating space is formed.
- the heating hood has a plurality of burners operated with liquid or gaseous fuel, the flames of which are directed openly into the heating chamber.
- the bell-type annealing furnace has an emergency flushing device for flushing the annealing chamber under the protective hood and the heating chamber under the heating hood with inert gas, with an inert gas feed each opening into the annealing chamber and into the heating chamber.
- a heating hood of a bell-type annealing furnace with a cooling system, which, however, leads to a relatively complicated construction of the heating hood, is associated with restrictions in the design of the heating device arranged on the heating hood and leads to a very high weight of the heating hood, which then can only be moved with a powerful crane.
- An object of the invention is to simplify operation of a bell annealing furnace.
- a bell-type annealing furnace according to the invention for annealing annealing material has at least one base, which has at least one storage space on which at least one charge of the annealing material can be arranged, at least one protective hood, with which the annealing material arranged on the storage space can be covered by forming a through the protective hood and the storage space enclosed glow space can be covered, at least one heating hood with which the protective hood can be covered, forming an intermediate space which is arranged between the heating hood and the protective hood and is delimited on the bottom by the base, and at least one cooling gas system which is or can be connected in a communicating manner to the intermediate space.
- the cooling gas system is communicatively connected to the intermediate space via at least one formed on the base Cooling gas outlet and at least one cooling gas inlet formed on the base and communicatively connected to the intermediate space, communicatively connected or connectable to the intermediate space.
- the cooling gas system is independent of the heating mantle, so that the weight of the heating mantle is not increased by the cooling gas system.
- the heating hood can be moved under a lower crane load, which simplifies the operation of the bell-type annealing furnace.
- the heating and cooling functions and the components of the bell-type annealing furnace used for this purpose are structurally clearly separated from one another, which makes the construction of the bell-type annealing furnace clearer and simpler overall, which is also associated with simplified operation.
- the cooling gas system is connected to the base, which does not have to be moved to operate the bell-type annealing furnace.
- Two or more cooling gas outlets and/or two or more cooling gas inlets can also be formed on the base, via which the cooling gas system is or can be connected in a communicating manner to the intermediate space.
- the respective cooling gas outlet or cooling gas inlet can be formed, for example, as an opening or through hole on the base.
- the base cooperates with the heating mantle to externally close the gap between the heating mantle and the protective hood placed on the base location when the heating mantle is placed on the base and sealed thereto.
- the base can also have two or more parking spaces, on each of which at least one charge of the annealing material can be arranged.
- the protective hood cooperates with the parking space or a section of the base surrounding the parking space to form the glow space between the parking space or base and the protective hood placed on the parking space or base to be closed to the outside if the protective hood is set up on the parking space or base and sealed against it.
- the bell-type annealing furnace has a separate or dedicated protective hood for each position. If the respective protective hood is placed on the parking space or base and the heating hood is placed on the base, the gap is limited by the heating hood, the protective hood and the base.
- a cooling gas can be passed through the intermediate space to cool the annealed annealing material, with the cooling gas cooling the annealing material indirectly via the respective protective hood and a gas located in the annealing chamber.
- the cooling gas system can be in continuous communication with the intermediate space.
- the cooling gas system can only be connected to the intermediate space to carry out a cooling process, i.e. it can be connected to the intermediate space in a communicating manner by means of closing devices arranged on the cooling gas outlet and the cooling gas inlet, for example electrically controllable or manually actuated, if required.
- the material to be annealed can be a grain-oriented electrical strip, for example.
- a charge of the annealing material can be formed, for example, by winding the grain-oriented electrical strip into a coil or by stacking at least two such coils.
- the cooling gas system has at least one cooling gas duct connected in a communicating manner to the cooling gas outlet and the cooling gas inlet, at least one cooling unit arranged on the cooling gas duct and at least one blower arranged on the cooling gas duct.
- the cooling gas guide can have at least one cooling gas line.
- the cooling unit can be designed as an active or passive cooling unit.
- the cooling unit can have at least one heat exchanger.
- the base has at least two spaced-apart positions and the bell-type annealing furnace has its own protective hood for each position, with the protective hoods being able to be covered with a single common heating hood, at least one cooling gas inlet being formed on the base for each position, each cooling gas inlet is connected via the cooling gas duct to the at least one cooling gas outlet and the cooling gas system has a single cooling unit arranged on the cooling gas duct and a single fan arranged on the cooling gas duct.
- each parking space is assigned at least one cooling gas inlet of its own, a relatively uniform simultaneous cooling of annealed material on the parking spaces can be carried out.
- the cooling unit and the fan can be arranged on a common cooling gas main line of the cooling gas system, at one end of which branch cooling gas branch lines, the number of which corresponds at least to the number of parking spaces and which are individually connected to the respective cooling gas inlet.
- the cooling gas system has at least one electrically controllable adjusting device, by means of which a cooling gas volume flow to the respective cooling gas inlet can be adjusted.
- This adjusting device can be arranged, for example, on a cooling gas branch line branching off from an above-mentioned main cooling gas line. That The cooling gas system can have its own adjusting device for each cooling gas branch line that branches off in this way, in order to be able to set the cooling gas volume flow flowing through the respective branching cooling gas branch line individually. In this way, the simultaneous cooling of annealing material can be optimized on several locations of the base.
- the respective adjusting device can have at least one flap arranged in the respective cooling gas branch line and at least one drive which can be actuated electrically or manually and actuates the flap.
- the cooling gas outlet is arranged in a central area of the base between the parking spaces.
- the cooling gas heated during cooling can be sucked out of the intermediate space centrally, while the cooled cooling gas can be supplied, for example, in edge regions of the intermediate space.
- Two or more cooling gas outlets can also be arranged in the central area of the base between the parking spaces.
- the cooling gas system can largely be arranged in an area, for example in a basement of a plant located under the floor on which the base is placed, where the space conditions are less restricted than above the floor.
- the bell-type annealing furnace can be used according to one of the configurations mentioned above or a combination of at least two of these configurations together to carry out the method.
- the cooling gas sucked out of the intermediate space is cooled by means of at least one cooling unit and then introduced into the intermediate space.
- a cooling gas volume flow to the respective cooling gas inlet is adjusted individually.
- Figure 1 a schematic representation of an embodiment of a bell-type annealing furnace according to the invention.
- FIG. 1 shows a schematic representation of an exemplary embodiment of a bell-type annealing furnace 1 according to the invention for annealing material to be annealed (not shown).
- the bell-type annealing furnace 1 has a base 2, which has four spaces 3 to 6 spaced apart from one another in a row, on each of which a charge of the annealing material (not shown) can be arranged.
- the bell-type annealing furnace 1 has its own protective hood, not shown, for each parking space 3, 4, 5 or 6, with which the annealing material arranged on the respective parking space 3, 4, 5 or 6 is formed by the respective protective hood and the respective parking space 3, 4, 5 or 6 enclosed, not shown, can be covered.
- the bell-type annealing furnace 1 has a single heating hood, not shown, with which the protective hoods can be covered, forming an intermediate space, not shown, which is arranged between the heating hood and the protective hoods and is delimited on the bottom by the base 2 .
- the bell-type annealing furnace 1 has a cooling gas system 7 which is or can be connected in a communicative manner to the intermediate space.
- the cooling gas system 7 is communicatively connected or connectable to the intermediate space via two cooling gas outlets 8 formed on the base 2 and communicatively connected to the intermediate space and eight cooling gas inlets 9 embodied on the base 2 and communicatively connected to the intermediate space.
- the cooling gas outlets 8 are arranged in a central region of the base 2 between the parking spaces 3 and 4 on the one hand and 5 and 6 on the other.
- the cooling gas inlets 9 are available in pairs for each parking space 3, 4, 5 or 6, see above that on the base 2 for each parking space 3, 4, 5 and 6 two cooling gas inlets 9 are formed.
- the cooling gas system 7 has a cooling gas duct 10 connected in a communicating manner to the cooling gas outlets 8 and the cooling gas inlets 9 , a single cooling unit 11 arranged on the cooling gas duct 10 and a single fan 12 arranged on the cooling gas duct 10 .
- Each cooling gas inlet 9 is connected to the cooling gas outlets 8 via the cooling gas duct 10 .
- the cooling gas duct 10 has a main cooling gas line 13 on which the cooling unit 11 and the fan 12 are arranged.
- the cooling gas main line 13 is connected at one end to the cooling gas outlets 8 via cooling gas branch lines 14 .
- the other end of the cooling gas main line 13 is connected to cooling gas branch lines 15 whose other ends are in turn connected to the cooling gas inlets 9 via two cooling gas branch lines 16 .
- the cooling gas system 7 has four electrically controllable adjusting devices 17 which are each arranged on one of the cooling gas branch lines 15 and by means of which a cooling gas volume flow to the respective pair of cooling gas inlets 9 can be individually adjusted.
- At least a major part of the cooling gas duct 10, the cooling unit 11 and the fan 12 are arranged on the bottom below the base 2, which is not shown in FIG. 1 for reasons of clarity.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (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)
- Furnace Details (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020212723.9A DE102020212723A1 (de) | 2020-10-08 | 2020-10-08 | Haubenglühofen und Verfahren zum Kühlen eines in einem Haubenglühofen befindlichen Glühguts |
PCT/EP2021/075028 WO2022073721A1 (de) | 2020-10-08 | 2021-09-13 | Haubenglühofen und verfahren zum kühlen eines in einem haubenglühofen befindlichen glühguts |
Publications (3)
Publication Number | Publication Date |
---|---|
EP4226109A1 true EP4226109A1 (de) | 2023-08-16 |
EP4226109B1 EP4226109B1 (de) | 2024-04-17 |
EP4226109C0 EP4226109C0 (de) | 2024-04-17 |
Family
ID=77924349
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21777975.0A Active EP4226109B1 (de) | 2020-10-08 | 2021-09-13 | Haubenglühofen und verfahren zum kühlen eines in einem haubenglühofen befindlichen glühguts |
Country Status (4)
Country | Link |
---|---|
US (1) | US20230366628A1 (de) |
EP (1) | EP4226109B1 (de) |
DE (1) | DE102020212723A1 (de) |
WO (1) | WO2022073721A1 (de) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT354500B (de) * | 1978-03-01 | 1980-01-10 | Voest Ag | Verfahren und vorrichtung zur gluehbehandlung von kaltgewalzten baendern aus metall |
DE3824415A1 (de) * | 1988-07-19 | 1990-01-25 | Gottfried Von Czarnowski | Kuehlhaube zum schnellen abkuehlen von gluehgut, insbesondere stahlband |
DE112010000762A5 (de) * | 2009-02-04 | 2012-07-26 | Loi Thermprocess Gmbh | Verfahren und anlage zum wärmebehandeln von blechen |
PL2486157T3 (pl) | 2009-10-09 | 2018-05-30 | Loi Thermprocess Gmbh | Sposób wysokotemperaturowego wyżarzania taśm metalowych i piec dzwonowy do takiego wyżarzania |
JP5845791B2 (ja) * | 2011-10-05 | 2016-01-20 | Jfeスチール株式会社 | 焼鈍炉の冷却装置 |
DE102012221511C5 (de) | 2012-11-23 | 2019-01-17 | Ebner-Industrieofenbau Gmbh | Kühlhaube zum langsamen Abkühlen von Glühgut |
DE102012023430A1 (de) * | 2012-11-30 | 2014-06-05 | Bilstein Gmbh & Co. Kg | Haubenglühofen sowie Verfahren zum Betreiben eines solchen |
-
2020
- 2020-10-08 DE DE102020212723.9A patent/DE102020212723A1/de active Pending
-
2021
- 2021-09-13 US US18/030,644 patent/US20230366628A1/en active Pending
- 2021-09-13 WO PCT/EP2021/075028 patent/WO2022073721A1/de unknown
- 2021-09-13 EP EP21777975.0A patent/EP4226109B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
EP4226109B1 (de) | 2024-04-17 |
EP4226109C0 (de) | 2024-04-17 |
US20230366628A1 (en) | 2023-11-16 |
WO2022073721A1 (de) | 2022-04-14 |
DE102020212723A1 (de) | 2022-04-14 |
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