EP1338658A2 - Verfahren und Vorrichtung zur Wärmebehandlung von Werkstücken - Google Patents
Verfahren und Vorrichtung zur Wärmebehandlung von Werkstücken Download PDFInfo
- Publication number
- EP1338658A2 EP1338658A2 EP03003368A EP03003368A EP1338658A2 EP 1338658 A2 EP1338658 A2 EP 1338658A2 EP 03003368 A EP03003368 A EP 03003368A EP 03003368 A EP03003368 A EP 03003368A EP 1338658 A2 EP1338658 A2 EP 1338658A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- treatment
- treatment gas
- gas
- cleaning
- atmosphere
- 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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
- C21D1/763—Adjusting the composition of the atmosphere using a catalyst
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the 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
- C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
Definitions
- the invention relates to a method for heat treatment of workpieces in a treatment room with a Treatment gas atmosphere, especially in one Continuous furnace and a device therefor.
- Treatment gas poses a problem Treatment gas naturally also depends on the quality the heat treatment of the workpieces. Because in particular Continuous furnaces cannot be hermetically sealed, contaminants enter the continuous furnace from the outside and contaminate the treatment gas. In particular atmospheric oxygen passes through an inlet and a Outlet opening in the continuous furnace, but is also with the workpiece to be treated in the treatment room transported. This oxygen contaminates it Treatment gas, which is undesirable, so far the Contamination accepted or at intervals entire treatment gas is exchanged.
- the present invention is based on the object Method and device of the above Kind of creating with which the treatment gas atmosphere is improved and can be stabilized.
- the protective reaction gas can consist of hydrogen, nitrogen (argon) / hydrogen mixtures or other hydrogen-containing mixtures
- the protective reaction gas can consist of hydrogen, nitrogen (argon) / hydrogen mixtures or other hydrogen-containing mixtures
- atmospheric oxygen to be set off, but mainly process moisture is to be removed.
- the purified treatment gas is preferred before Return to the treatment atmosphere with fresh Treatment gas mixed. However, it is also conceivable that cleaned treatment gas and fresh treatment gas different places is fed to the continuous furnace.
- the contaminated treatment gas is removed from the Aspirated treatment atmosphere and a thermal Subjected to treatment.
- This is preferably done thermal treatment in a catalyst, preferably in a platinum catalyst. Is it that Treatment gas around hydrogen, so in the catalyst the molecular atmospheric oxygen with reactive components of the treatment gas connected, so that in the Treatment gas water vapor is formed.
- This mixture Hydrogen and water vapor now become one Condensate trap fed.
- a recuperator it will Mixture cooled down until the water liquefied and fails. The appropriate cooling will supported by a heat exchanger.
- atmospheric oxygen is displaced by feeding in protective or reaction gases by building up a furnace overpressure (P ü ⁇ 1mm Ws) with a larger dimension than the protective gas purge volume.
- the measurement of the shielding gas volume is based on empirical values that take into account the possible external interference (e.g. drafts, air humidity, etc.).
- the catalytic cleaning enables the furnace shorter start-up behavior after a standstill (due to shorter inert gas formation times).
- the treatment gas When the treatment gas is regenerated, this becomes Treatment gas exchanged several times, d. that is, the proportion of Usually used protective gas volume fraction this can be reduced to a fifth. This will the treatment gas after catalytic cleaning the recuperator in a cold trap, the Moisture, as mentioned above, turns out to be solid or liquid. The residual moisture in the treatment gas can Heat treatment process to be adjusted.
- This regeneration is therefore also for hood annealing and interesting other ovens that are hermetically sealed and work discontinuously.
- Hood annealing including pot ovens
- Dome annealing can be reduced to a minimum.
- the advantages of the present method lie once in that a larger flushing amount of protective gas in the Heating zone and an adjoining one if necessary Cooling section is available. They are also adjustable Flow conditions in the area of the heating zone and in the Cooling section through variable intake quantity settings on the Tapping points possible.
- the process moisture is removed from the treatment room by the protective gas flow, so that a reduction (ratio H 2 / H 2 O) of the workpieces is guaranteed.
- the process moisture is halved, which results from the addition of the shielding gas quantities (fresh gas + regenerated gas). This means that less purge gas is required to remove the moisture generated in the process, without reducing the quality of the workpieces.
- the corresponding workpiece, not shown, which to be treated is on a conveyor belt 1, which rotates two pulleys 2 and 3.
- the actual treatment of the workpiece takes place in one Treatment room 4 instead, in which, for example Workpiece can be heated.
- a cooling section follows the treatment room 4 5 provided.
- a cooling section 5 follows Outflow area 6, during the treatment room 4 Inlet area 7 is connected upstream.
- sealing plugs 8 and 9 are connected upstream of feed points 10 and 11 for nitrogen (N 2 ) in the inlet and outlet areas 7 and 6.
- a catalyst connects directly to the feed line 16, preferably a platinum catalyst 19. This is over a line 20 with a condensate trap in connection, the condensate trap consisting of a recuperator 21 and a Heat exchanger 22 exists.
- the heat exchanger 22 is about a line 23 cryogenic nitrogen from one not closer supplied nitrogen source shown.
- the condensate trap is followed by a compressor 24, in which also a feed line 25 for fresh treatment gas opens into a tank 26.
- a return line 27 connects to the compressor 24, at another feed point 28 in the Continuous furnace R opens out.
- a treatment gas atmosphere for example made of hydrogen (H 2 ), is formed in the continuous furnace R.
- the treatment gas now contaminated with H 2 O is subsequently passed over the condensate trap 21, 22, H 2 O becoming liquid and precipitating.
- the treatment gas in the recuperator is cooled down accordingly, which is ensured by the heat exchanger 22.
- the regenerated treatment gas is then included in the compressor Fresh gas mixed and the continuous furnace R again fed.
- the ratio of fresh gas to regenerated gas can for example 1: 1 or up to 1: 3.
- An excess treatment gas present in the continuous furnace R is discharged from the continuous furnace R between the sealing plug 8 and the tapping point 12 or 9 and 13 and flared by means of an ignition source 29 or 30.
- Position Number List 1 conveyor belt 34 67 2 idler pulley 35 68 3 idler pulley 36 69 4 treatment room 37 70 5 cooling section 38 71 6 discharge area 39 72 7 intake area 40 73 8th sealing plug 41 74 9 sealing plug 42 75 10 feed point 43 76 11 feed point 44 77 12 sampling point 45 78 13 sampling point 46 79 14 management 47 15 management 48 16 feed 49 17 shut-off valve 50 18 shut-off valve 51 19 catalyst 52 20 management 53 21 recuperator 54 22 heat exchangers 55 23 management 56 24 compression 57 25 supply 58 26 tank 59 27 Return line 60 28 feed point 61 29 ignition source 62 Q Facility 30 ignition source 63 R Continuous furnace 31 64 32 65 33 66
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Tunnel Furnaces (AREA)
- Furnace Details (AREA)
Abstract
Description
Positionszahlenliste | |||||
1 | Förderband | 34 | 67 | ||
2 | Umlenkrolle | 35 | 68 | ||
3 | Umlenkrolle | 36 | 69 | ||
4 | Behandlungsraum | 37 | 70 | ||
5 | Kühlstrecke | 38 | 71 | ||
6 | Auslaufbereich | 39 | 72 | ||
7 | Einlaufbereich | 40 | 73 | ||
8 | Verschlussstopfen | 41 | 74 | ||
9 | Verschlussstopfen | 42 | 75 | ||
10 | Einspeisstelle | 43 | 76 | ||
11 | Einspeisstelle | 44 | 77 | ||
12 | Entnahmestelle | 45 | 78 | ||
13 | Entnahmestelle | 46 | 79 | ||
14 | Leitung | 47 | |||
15 | Leitung | 48 | |||
16 | Zuführleitung | 49 | |||
17 | Absperrventil | 50 | |||
18 | Absperrventil | 51 | |||
19 | Katalysator | 52 | |||
20 | Leitung | 53 | |||
21 | Rekuperator | 54 | |||
22 | Wärmetauscher | 55 | |||
23 | Leitung | 56 | |||
24 | Verdichtung | 57 | |||
25 | Zuleitung | 58 | |||
26 | Tank | 59 | |||
27 | Rückführleitung | 60 | |||
28 | Einspeisstelle | 61 | |||
29 | Zündquelle | 62 | Q | Einrichtung | |
30 | Zündquelle | 63 | R | Durchlaufofen | |
31 | 64 | ||||
32 | 65 | ||||
33 | 66 |
Claims (18)
- Verfahren zur Wärmebehandlung von Werkstücken in einem Behandlungsraum (4) mit einer Behandlungsgasatmosphäre, insbesondere in einem Durchlaufofen,
dadurch gekennzeichnet, dass im Prozess verunreinigtes Behandlungsgas zumindest zum Teil der Behandlungsgasatmosphäre entzogen, gereinigt und der Behandlungsgasatmosphäre wieder zugeführt wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das gereinigte Behandlungsgas vor der Rückführung in die Behandlungsatmosphäre mit frischem Behandlungsgas gemischt wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das verunreinigte Behandlungsgas aus der Behandlungsgasatmosphäre abgesaugt und einer thermischen Behandlung unterworfen wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass im Behandlungsgas vorhandener Luftsauerstoff (O2) beim Reinigen des Behandlungsgases (H) an reaktive Bestandteile des Behandlungsgases angebunden wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass der Luftsauerstoff (O2) mit Wasserstoffmolekülen (H) zu Wasser (H2O)verbunden wird.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass nachfolgend das Wasser (H2O) in einer Kondensatfalle aus dem Behandlungsgas ausgefällt wird.
- Verfahren nach wenigstens einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass überschüssiges Behandlungsgas vor und/oder nach dem Behandlungsraum (4) abgeführt und ggf. abgefackelt wird.
- Verfahren nach wenigstens einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass einem Einlauf- und/oder Auslaufbereich (7, 6) zu bzw. von dem Behandlungsraum (4) Stickstoff (N2) zugeführt wird.
- Vorrichtung zur Durchführung des Verfahrens nach wenigstens einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, das vor und/oder nach dem Behandlungsraum (4) eine Entnahmestelle (12, 13) für verunreinigtes Behandlungsgas vorgesehen ist, welche mit einer Einrichtung (Q) zum Reinigen des Behandlungsgases in Verbindung steht, aus der eine Rückführleitung (27) zurück in die Behandlungsatmosphäre erfolgt.
- Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die Entnahmestellen (12, 13) entsprechende Saugrüssel sind.
- Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass eine Entnahmestelle (12) vor und eine Entnahmestelle (13) nach dem Behandlungsraum (4) vorgesehen und über Leitungen (14, 15) zu einer Zuführleitung (16) zu der Einrichtung (Q) zum Reinigen des Behandlungsgases verbunden sind.
- Vorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass in der Einrichtung (Q) zum Reinigen des Behandlungsgases ein Katalysator, insbesondere ein Platinkatalysator (19) vorgesehen ist.
- Vorrichtung nach wenigstens einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass in der Einrichtung (Q) zum Reinigen des Behandlungsgases eine Kondensatfalle (21, 22) vorgesehen ist.
- Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass die Kondensatfalle aus einem Rekuperator (21) und einem Wärmetauscher (22) besteht.
- Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass der Wärmetauscher (22) mit einer Quelle für tiefkalten Stickstoff in Verbindung steht.
- Vorrichtung nach wenigstens einem der Ansprüche 1 bis 15, dadurch gekennzeichnet, dass der Einrichtung (Q) zum Reinigen von Behandlungsgas ein Verdichter (24) nachgeschaltet ist, der über eine Verbindungsleitung (25) mit einer Quelle (26) für Behandlungsgas in Verbindung steht.
- Vorrichtung nach wenigstens einem der Ansprüche 1 bis 16, dadurch gekennzeichnet, dass vor und/oder nach dem Behandlungsraum (4) ein Verschlussstopfen (8, 9) vorgesehen ist/sind.
- Vorrichtung nach wenigstens einem der Ansprüche 15 bis 17, dadurch gekennzeichnet, dass der Stickstoff nach dem Wärmetauscher (22) über Zuleitungen Einspeisstellen (10, 11) vor und/oder nach dem Behandlungsraum (4) zuführbar ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10208267 | 2002-02-26 | ||
DE2002108267 DE10208267A1 (de) | 2002-02-26 | 2002-02-26 | Verfahren und Vorrichtung zur Wärmebehandlung von Werkstücken |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1338658A2 true EP1338658A2 (de) | 2003-08-27 |
EP1338658A3 EP1338658A3 (de) | 2005-01-12 |
EP1338658B1 EP1338658B1 (de) | 2016-01-06 |
Family
ID=27635328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03003368.2A Expired - Lifetime EP1338658B1 (de) | 2002-02-26 | 2003-02-14 | Verfahren und Vorrichtung zur Wärmebehandlung von Werkstücken |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1338658B1 (de) |
DE (1) | DE10208267A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009058642A1 (de) * | 2009-12-16 | 2011-06-22 | Ipsen International GmbH, 47533 | Verfahren und Einrichtung zur Regelung von Prozessgasen für Wärmebehandlungen von metallischen Werkstoffen/Werkstücken in Industrieöfen |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4414043A (en) | 1982-01-22 | 1983-11-08 | United States Steel Corporation | Continuous decarburization annealing with recycle to convert carbon monoxide |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62139810A (ja) * | 1985-12-16 | 1987-06-23 | Ishikawajima Harima Heavy Ind Co Ltd | 焼戻炉の炉内清浄方法および装置 |
DE3707099A1 (de) * | 1987-03-05 | 1988-09-15 | Junker Gmbh O | Verfahren zur reduzierung der schadstoffemissionswerte eines mit schutzgas arbeitenden erwaermungsofens |
DE3742685A1 (de) * | 1987-12-16 | 1989-07-13 | Linde Ag | Verfahren zur waermebehandlung von metallen |
DE19651878C2 (de) * | 1996-12-13 | 2002-01-17 | Messer Griesheim Gmbh | Verfahren zum Herstellen eines Schutz- oder Reaktionsgases für die Wärmebehandlung von Metallen |
-
2002
- 2002-02-26 DE DE2002108267 patent/DE10208267A1/de not_active Withdrawn
-
2003
- 2003-02-14 EP EP03003368.2A patent/EP1338658B1/de not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4414043A (en) | 1982-01-22 | 1983-11-08 | United States Steel Corporation | Continuous decarburization annealing with recycle to convert carbon monoxide |
Also Published As
Publication number | Publication date |
---|---|
EP1338658B1 (de) | 2016-01-06 |
DE10208267A1 (de) | 2003-09-04 |
EP1338658A3 (de) | 2005-01-12 |
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