DE4416233A1 - Annealing oven with emphasis on waste heat recovery - Google Patents
Annealing oven with emphasis on waste heat recoveryInfo
- Publication number
- DE4416233A1 DE4416233A1 DE19944416233 DE4416233A DE4416233A1 DE 4416233 A1 DE4416233 A1 DE 4416233A1 DE 19944416233 DE19944416233 DE 19944416233 DE 4416233 A DE4416233 A DE 4416233A DE 4416233 A1 DE4416233 A1 DE 4416233A1
- Authority
- DE
- Germany
- Prior art keywords
- furnace
- preheating
- heat
- zone
- annealing 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.)
- Ceased
Links
Classifications
-
- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/147—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving on an inclined floor
-
- 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
- C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
-
- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
- F27B9/068—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by radiant tubes, the tube being heated by a hot medium, e.g. hot gases
-
- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/15—Composition, conformation or state of the charge characterised by the form of the articles
- F27M2001/1539—Metallic articles
- F27M2001/1547—Elongated articles, e.g. beams, rails
- F27M2001/1556—Tubes or cylindrical bodies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Tunnel Furnaces (AREA)
Abstract
Description
Die Erfindung betrifft eine Glühofen für metallische Werkstücke, insbesondere für Schleudergußrohre, mit ei ner in dem Ofenherd angeordneten Transporteinrichtung zum Durchrollen der zu glühenden Werkstücke durch den in mehrere Wärmebehandlungszonen und eine Vorwärmzone unterteilten Ofeninnenraum.The invention relates to an annealing furnace for metallic Workpieces, especially for centrifugal cast iron pipes, with egg ner arranged in the oven range transport for rolling the workpieces to be annealed through the in several heat treatment zones and one preheating zone divided furnace interior.
Ein derartiger Glühofen, wie er beispielsweise aus der DE 27 08 783 C2 bekannt ist, dient der Wärmebehandlung, insbesondere von Schleudergußrohren. Derartige Schleu dergußrohre weisen nach dem Strippen, d. h. nach dem Herausziehen aus der Kokille der Gießmaschine, ein un gleichmäßiges, teilweise sprödes Gefüge auf. Zur Ver gleichmäßigung des Gefüges und zum Erreichen der gefor derten Duktilität müssen sie in einem Glühofen wärmebe handelt werden. Diese Wärmebehandlung erfordert einen relativ hohen Einsatz von Heizenergie, und man ist be strebt, die in den heißen Rauchgasen vorhandene Ener giemenge zu nutzen. Die Rauchgase sind aber nicht inert, und die zu glühenden Schleudergußrohre erfahren insbesondere durch den zwangläufig vorhandenen CO/CO₂- Anteil eine Beeinflussung ihre chemisch-metallurgischen Zusammensetzung.Such an annealing furnace, as for example from the DE 27 08 783 C2 is known, is used for heat treatment, especially of centrifugal cast pipes. Such sluice dergußrohre point after stripping, d. H. after this Pulling out of the mold of the casting machine, a un uniform, partially brittle structure. Ver uniformity of the structure and to achieve the gefor You have to heat the ductility in an annealing furnace be acted. This heat treatment requires one relatively high use of heating energy, and one is strives for the ener present in the hot flue gases to use the amount. The smoke gases are not inert, and experience the centrifugal cast tubes to be glowed especially due to the inevitable CO / CO₂- Share an influencing their chemical-metallurgical Composition.
Aufgabe der vorliegenden Erfindung ist es, einen Glüh ofen der eingangs beschriebenen Art zu schaffen, bei dem die eingesetzte Heizenergie optimal ausgenutzt wer den kann, ohne die chemisch-metallurgische Zusammenset zung des Glühgutes zu beeinträchtigen.The object of the present invention is a glow to create oven of the type described above, at who optimally utilizes the heating energy used can do this without the chemical-metallurgical composition affect the annealing material.
Gelöst wird diese Aufgabe dadurch, daß in der Vorwärm zone Wärmestrahlrohre vorgesehen sind und die Wärme strahlrohre mit dem Rauchgasabzug der beheizten Zonen des Ofeninnenraumes verbunden sind. Durch diese Maßnah men können die relativ heißen Rauchgase durch die Wär mestahlrohre geführt und zur Vorwärmung des Glühgutes genutzt werden. Die in den Rauchgasen enthaltene Wärme energie kann so ausgenutzt werden, ohne daß die che misch belasteten Rauchgase mit dem Glühgut in Berührung kommen. Die eingestellte Ofenatmosphäre bleibt davon unbeeinflußt und konstant.This problem is solved in that in the preheating zone heat radiation tubes are provided and the heat radiant tubes with the flue gas discharge from the heated zones of the furnace interior are connected. Through this measure The relatively hot flue gases can be caused by the heat guided steel tubes and for preheating the annealing material be used. The heat contained in the flue gases energy can be exploited without the kitchen mixed smoke gases in contact with the annealing material come. The set furnace atmosphere remains unaffected and constant.
Weitere vorteilhafte Maßnahmen sind in den übrigen Un teransprüchen beschrieben. Die Erfindung ist anhand ei nes Ausführungsbeispieles in der beiliegenden Zeichnung dargestellt und wird nachfolgend näher beschreiben; es zeigt:Further advantageous measures are in the remaining Un Described claims. The invention is based on egg Nes embodiment in the accompanying drawings shown and will be described in more detail below; it shows:
Fig. 1 die Seitenansicht eines gattungsmä ßigen Glühofens; Fig. 1 is a side view of a gattungsmä ß annealing furnace;
Fig. 2 den Schnitt durch den Ofeneinlauf nach der Fig. 1 in Detaildarstellung, mit einer durch Wärmestrahlrohre vor heizbaren Vorwärmzone. Fig. 2 shows a section through the furnace inlet according to FIG. 1 in a detailed view, with a preheating zone that can be heated by heat radiation tubes.
In der Fig. 1 ist ein Glühofen 10 dargestellt, der einen Ofeneinlauf 13 und einen Ofenauslauf 16 aufweist. Vor dem Glühofen 10 sind Gießmaschinen 11 zur Fertigung von Schleudergußrohren 26 aufgestellt. Die in den Gieß maschinen 11 produzierten Schleudergußrohre 26 werden nach ihrem Strippen in dem Glühofen 10 einer Wärmebe handlung unterzogen. Dazu werden sie über eine Rohrzu führung 12 zu dem Ofeneinlauf 13 gerollt. In FIG. 1, a furnace 10 is shown, having a kiln inlet 13 and a kiln outlet sixteenth In front of the annealing furnace 10 , casting machines 11 for the production of centrifugal cast pipes 26 are set up. The centrifugal cast pipes 26 produced in the casting machines 11 are subjected to a heat treatment after stripping in the annealing furnace 10 . For this purpose, they are rolled over a pipe feed 12 to the furnace inlet 13 .
Der Glühofen 10 weist einen Ofeninnenraum 31 auf, der in eine Aufheizzone 19, eine sich daran anschließende Haltezone 20, eine Schnellkühlzone 21 und zwei Fer ritisierungszonen 22 unterteilt ist. Die einzelnen Zo nen können durch nicht dargestellte Kettenvorhänge ab geteilt sein. Um in dem Ofeninnenraum 31 Tätigkeiten ausführen zu können, sind seitliche Ofentüren 15 vorge sehen.The annealing furnace 10 has an oven interior 31 which is divided into a heating zone 19 , an adjoining holding zone 20 , a rapid cooling zone 21 and two fermentation zones 22 . The individual Zen can be divided by chain curtains, not shown. In order to be able to perform 31 activities in the furnace interior, side furnace doors 15 are easily seen.
Der Glühofen 10 weist einen Ofenherd 24 auf, der vom Ofeneinlauf 13 zum Ofenauslauf 16 hin ansteigt. In dem Ofenherd 24 ist eine längsverlaufende Transportkette 23 angeordnet, mit deren Hilfe die Schleudergußrohre 26 über den ansteigenden Ofenherd 24 gerollt werden, um hitzebedingte Verformungen zu vermeiden.The annealing furnace 10 has a furnace range 24 which rises from the furnace inlet 13 to the furnace outlet 16 . A longitudinal transport chain 23 is arranged in the oven hearth 24 , with the aid of which the centrifugal cast pipes 26 are rolled over the rising oven hearth 24 in order to avoid heat-related deformations.
An den Glühofen 10 schließen sich zwei parallel ange ordnete Adjustagen 18 an, von denen jedoch nur eine dargestellt ist.At the annealing furnace 10 adjoin two parallel adjustment 18 , of which only one is shown.
Produzieren die Gießmaschinen 11 nur mit halber Kapazi tät, so kann zunächst auf die nicht dargestellte Puf ferstrecke gefertigt und der Glühofen 10 solange abge schaltet werden. Um den Ofen nach dem Abschalten der Aufheizzone 19 vor zu schneller Abkühlung zu bewahren, ist dem Ofeneinlauf 13 eine vordere Ofentür 25 zugeord net. Diese vordere Ofentür 25 kann nach dem Abschalten der Beheizung des Glühofens 10 geschlossen werden.Produce the casting machines 11 only with half capacity, so can first be produced on the non-illustrated buffer section and the annealing furnace 10 can be switched off for as long. In order to prevent the furnace from cooling down too quickly after the heating zone 19 has been switched off, the furnace inlet 13 has a front furnace door 25 assigned to it. This front furnace door 25 can be closed after the heating of the annealing furnace 10 has been switched off.
In der Aufheizzone 19 und der Haltezone 20 sind Brenner 14 angeordnet, mit denen die jeweils erforderliche Glühtemperatur eingestellt werden kann. Die Brenner 14 werden mit Gas beheizt, wobei heiße Rauchgase entste hen, die über einen der Aufheizzone 19 zugeordneten vorderen Rauchgasabzug 28 und einen der Haltezone 20 zugeordneten hinteren Rauchgasabzug 28a abgezogen wer den. In the heating zone 19 and the holding zone 20 , burners 14 are arranged with which the annealing temperature required in each case can be set. The burners 14 are heated with gas, whereby hot flue gases arise, which are deducted via a front flue gas outlet 28 assigned to the heating zone 19 and a rear flue gas outlet 28 a assigned to the holding zone 20 .
Die von den Brennern 14 in der Aufheizzone 19 und der sich an diese anschließenden Haltezone 20 erzeugt hei ßen Rauchgase gelangen über die Rauchgasabzüge 28 und 28a in einen Rauchgassammelkanal 30. In den Rauch gasabzügen 28 und 28a sind Drosselklappen 34 vorgese hen, mit denen die jeweiligen Rauchgasströme reguliert werden können.The hot flue gases generated by the burners 14 in the heating zone 19 and the holding zone 20 adjoining them pass through the flue gas extractors 28 and 28 a into a flue gas collecting duct 30 . In the smoke gas vent 28 and 28 a throttle valves 34 are hen with which the respective flue gas flows can be regulated.
Um die auf der nicht dargestellten Pufferstrecke rela tiv kalt gewordenen Schleudergußrohre 26 möglichst schnell wieder auf Glühtemperatur aufzuheizen, ist vor der Aufheizzone 19 eine Vorwärmzone 33 vorgesehen, die über Wärmestrahlrohre 27 beheizt wird. Die Wärmestrahl rohre 27 werden mit den heißen Rauchgasen der Aufheiz zone 19 und der Haltezone 20 beheizt.In order to heat the centrifuge tubes 26, which have become rela tively cold, as quickly as possible back to the annealing temperature on the buffer path (not shown), a preheating zone 33 is provided in front of the heating zone 19 and is heated via heat radiation tubes 27 . The heat radiation tubes 27 are heated with the hot flue gases of the heating zone 19 and the holding zone 20 .
Zur Beheizung der Wärmestrahlrohre 27 werden die rela tiv heißen Rauchgase über den gemeinsamen Rauchgas sammelkanal 30 in einen seitlich des Glühofens 10 ange ordneten Rauchgasverteiler 32 geleitet, von wo aus sie in Wärmestrahlrohre 27 gelangen. Wie die Fig. 2 zeigt, sind die Wärmestrahlrohre 27 querverlaufend an der Ofendecke 29 der Vorwärmzone 33 angeordnet. Da die Rauchgase in den Wärmestrahlrohren 27 durch die Vor wärmzone 33 geleitet werden, werden hier chemisch-me tallurgische Beeinflussungen der Ofenatmosphäre vermie den.For heating the heat radiation tubes 27 , the rela tively hot flue gases are passed through the common flue gas collecting duct 30 into a flue gas distributor 32 arranged laterally of the annealing furnace 10 , from where they get into heat radiation tubes 27 . As shown in FIG. 2, the heat radiation tubes 27 are arranged transversely on the furnace top 29 of the preheating zone 33 . Since the flue gases in the heat radiation tubes 27 are passed through the pre-heating zone 33 , chemical-mechanical influences on the furnace atmosphere are avoided here.
Um den Wärmeinhalt der Rauchgase optimal ausnutzen zu können, ist der Vorwärmkammer 33 eine Luftvorwärmung 17 in Form eines Rekuperators nachgeordnet. Die von der Vorwärmkammer 33 kommenden immer noch recht heißen Rauchgase werden in den Wärmestrahlrohren 33 der Luft vorwärmung 17 zugeführt. Mit Hilfe der Luftvorwärmung 17 kann so die Verbrennungsluft für die Brenner 14 in der Aufheizzone 19 und der Haltezone 20 vorgewärmt wer den.In order to be able to make optimum use of the heat content of the flue gases, an air preheater 17 in the form of a recuperator is arranged downstream of the preheating chamber 33 . Coming from the preheating chamber 33 still quite hot flue gases in the heat radiant tubes 33 preheating the air fed to the 17th With the help of air preheating 17 , the combustion air for the burners 14 in the heating zone 19 and the holding zone 20 can be preheated to who.
BezugszeichenlisteReference list
10 Glühofen
11 Gießmaschine
12 Rohrzuführung
13 Ofeneinlauf
14 Brenner
15 seitliche Ofentür
16 Ofenauslauf
17 Luftvorwärmung
18 Adjustage
19 Aufheizzone
20 Haltezone
21 Schnellkühlzone
22 Ferritisierungszone
23 Transportkette
24 Ofenherd
25 Ofentür, vorn
26 Schleudergußrohr
27 Wärmestrahlrohr
28, 28a Rauchgasabzug
29 Ofendecke
30 Sammelkanal
31 Ofeninnenraum
32 Rauchgasverteiler
33 Vorwärmzone
34 Drosselklappe. 10 annealing furnace
11 casting machine
12 pipe feed
13 oven inlet
14 burners
15 side oven door
16 oven outlet
17 Air preheating
18 adjustment
19 heating zone
20 stop zone
21 rapid cooling zone
22 ferritization zone
23 Transport chain
24 oven stove
25 Oven door, front
26 Centrifugal cast iron pipe
27 heat radiation tube
28 , 28 a flue gas discharge
29 furnace roof
30 collecting channel
31 furnace interior
32 flue gas distributors
33 preheating zone
34 throttle valve.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944416233 DE4416233A1 (en) | 1994-05-07 | 1994-05-07 | Annealing oven with emphasis on waste heat recovery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944416233 DE4416233A1 (en) | 1994-05-07 | 1994-05-07 | Annealing oven with emphasis on waste heat recovery |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4416233A1 true DE4416233A1 (en) | 1995-11-09 |
Family
ID=6517611
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19944416233 Ceased DE4416233A1 (en) | 1994-05-07 | 1994-05-07 | Annealing oven with emphasis on waste heat recovery |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4416233A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1788332A1 (en) * | 2005-11-21 | 2007-05-23 | Novac Engineering S.r.l. | Thermal treatment plant with energy recovery for light alloy elements |
DE102007062551A1 (en) * | 2007-12-20 | 2009-06-25 | Otto Junker Gmbh | Metal pin i.e. non-ferrous heavy metal pin, heating device, has jet pipe provided in heating area for heating of metal pins by thermal radiation, and burner i.e. recuperator burner, aligned axially parallel to jet pipe |
CN105352329A (en) * | 2015-07-21 | 2016-02-24 | 广东摩德娜科技股份有限公司 | Energy-saving kiln capable of utilizing waste heat and balancing snap-cooling air volume |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2420823A1 (en) * | 1974-04-30 | 1975-11-13 | Nassheuer Ind Ofenbau Jean | Heat treatment furnace with tubular heaters - has perforated tubular gas ducts for enclosing radiant heaters |
EP0282715A2 (en) * | 1987-03-05 | 1988-09-21 | Otto Junker GmbH | Process for the reduction of the nocuous substance emission by a heating furnace operating with protective gases |
WO1994008190A1 (en) * | 1992-10-05 | 1994-04-14 | Acon Finland Oy Ltd | Method and apparatus for improving the performance of a heating furnace for metal slabs |
-
1994
- 1994-05-07 DE DE19944416233 patent/DE4416233A1/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2420823A1 (en) * | 1974-04-30 | 1975-11-13 | Nassheuer Ind Ofenbau Jean | Heat treatment furnace with tubular heaters - has perforated tubular gas ducts for enclosing radiant heaters |
EP0282715A2 (en) * | 1987-03-05 | 1988-09-21 | Otto Junker GmbH | Process for the reduction of the nocuous substance emission by a heating furnace operating with protective gases |
WO1994008190A1 (en) * | 1992-10-05 | 1994-04-14 | Acon Finland Oy Ltd | Method and apparatus for improving the performance of a heating furnace for metal slabs |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1788332A1 (en) * | 2005-11-21 | 2007-05-23 | Novac Engineering S.r.l. | Thermal treatment plant with energy recovery for light alloy elements |
DE102007062551A1 (en) * | 2007-12-20 | 2009-06-25 | Otto Junker Gmbh | Metal pin i.e. non-ferrous heavy metal pin, heating device, has jet pipe provided in heating area for heating of metal pins by thermal radiation, and burner i.e. recuperator burner, aligned axially parallel to jet pipe |
DE102007062551B4 (en) * | 2007-12-20 | 2012-02-23 | Otto Junker Gmbh | Apparatus and method for heating metal bolts |
CN105352329A (en) * | 2015-07-21 | 2016-02-24 | 广东摩德娜科技股份有限公司 | Energy-saving kiln capable of utilizing waste heat and balancing snap-cooling air volume |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8131 | Rejection |