EP0531810A2 - Procédé pour changer l'athmosphère d'un four industriel - Google Patents

Procédé pour changer l'athmosphère d'un four industriel Download PDF

Info

Publication number: EP0531810A2
Authority: EP; European Patent Office
Prior art keywords: quantity measurement; gas supply; furnace; shielding gas; monitored
Prior art date: 1991-09-09
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

Application number

EP92114598A

Other languages

German (de)

English (en)

Other versions

EP0531810B1 (fr

EP0531810A3 (en

Inventor

Walter Dipl.-Ing.Dr.Techn. Scheuermann

Friedrich Höhner

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

LOI Thermprocess GmbH

Original Assignee

LOI Thermprocess GmbH

Loi Essen Industrieofenanlagen GmbH

Priority date (The priority date 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 date listed.)

1991-09-09

Filing date

1992-08-27

Publication date

1993-03-17

1992-08-27 Application filed by LOI Thermprocess GmbH, Loi Essen Industrieofenanlagen GmbH filed Critical LOI Thermprocess GmbH

1993-03-17 Publication of EP0531810A2 publication Critical patent/EP0531810A2/fr

1995-02-15 Publication of EP0531810A3 publication Critical patent/EP0531810A3/de

1998-11-25 Application granted granted Critical

1998-11-25 Publication of EP0531810B1 publication Critical patent/EP0531810B1/fr

2012-08-27 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

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
- F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
- 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
- F27D19/00—Arrangements of controlling devices

Definitions

the invention relates to a method for exchanging the atmosphere of an industrial furnace with protective gas which is introduced into the furnace while the furnace atmosphere flows out through a throttle point, a quantity measurement being carried out.
the method is used, for example, for the annealing of rolled sheets in bell-type furnaces. To achieve high strip purity, it is necessary to rinse out the rolling oil vapors generated during the annealing process.
Shielding gas is continuously supplied for purging and the furnace atmosphere is removed via a throttle, for example via a metering orifice, in order to ensure that the furnace is under excess pressure.
the throttle point can also be formed by a control valve that keeps the inert gas flow constant.
the shielding gas was supplied according to fixed purge rates and times. Sufficient flushing out of the rolling oil vapors could not be guaranteed as the amount of oil introduced can vary widely.
the object of the invention is to provide a remedy here and to create a possibility of optimizing the duration of the protective gas supply.
This object is achieved in that the quantity measurement is monitored and that the shielding gas supply is switched off when the quantity measurement adjusts to a constant value.
the invention is based on the knowledge that the amount of protective gas changes when the furnace atmosphere is removed via a throttle point until the furnace atmosphere is flushed out. The inert gas flow then remains constant.
the quantity measurement can be carried out and monitored in various ways, for example by monitoring a displacement counter or by tapping the differential pressure which arises at the throttle point in the form of a measuring throttle, for example a measuring orifice.
a process-dependent optimal duration of the protective gas supply is achieved.
the amount of shielding gas is kept constant by opening and closing the control valve accordingly. It is particularly advantageous if the adjustment of the control valve forming the throttle point is monitored. The rinsing can be stopped when the volume controller no longer sends an output signal to the servomotor of the control valve.
a particularly advantageous development of the invention consists in that electrical signals are derived from the quantity measurement, that these signals are arithmetically differentiated over time, and that the protective gas supply is terminated when the differential quotient has fallen below a predetermined value. This value goes to zero when the quantity measurement adjusts to a constant value.
the duration of the protective gas supply can be ended automatically at an optimal point in time without the composition of the furnace atmosphere being known or the operator having to intervene.
the protective gas supply is only ended after a set rinsing time has elapsed.
the invention is explained in more detail below using an example in connection with the drawing.
the drawing shows the shielding gas throughput in m3 depending on the time in hours.
Protective gas is introduced into a hood furnace (not shown) while the furnace atmosphere flows out through a metering orifice.
the diagram shown in the drawing shows the shielding gas throughput as a function of time.
their density changes, which results in a higher pressure loss at the throttle point and the shielding gas flow decreases.
Electrical signals are generated from a quantity measurement using a transmitter and differentiated over time in a process computer. If the differential quotient goes to zero and has fallen below a predetermined value, the protective gas supply is automatically ended after a rinsing time, without the rolling oil loading being known or the operator having to intervene.
the amount of protective gas is set to a constant value at time A.

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Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Heat Treatment Of Articles (AREA)
Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Heat Treatment Of Strip Materials And Filament Materials (AREA)

EP92114598A 1991-09-09 1992-08-27 Procédé pour changer l'athmosphère d'un four industriel Expired - Lifetime EP0531810B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE4129879A DE4129879A1 (de)	1991-09-09	1991-09-09	Verfahren zum austausch der atmosphaere eines industrieofens
DE4129879		1991-09-09

Publications (3)

Publication Number	Publication Date
EP0531810A2 true EP0531810A2 (fr)	1993-03-17
EP0531810A3 EP0531810A3 (en)	1995-02-15
EP0531810B1 EP0531810B1 (fr)	1998-11-25

Family

ID=6440164

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP92114598A Expired - Lifetime EP0531810B1 (fr)	1991-09-09	1992-08-27	Procédé pour changer l'athmosphère d'un four industriel

Country Status (2)

Country	Link
EP (1)	EP0531810B1 (fr)
DE (2)	DE4129879A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO1999002287A1 (fr) *	1997-07-07	1999-01-21	Norsk Hydro Asa	Procede de fusion de magnesium, sans emissions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10304945A1 (de) *	2003-02-06	2004-08-19	Loi Thermprocess Gmbh	Verfahren zum Wärmebehandeln von Metallteilen unter Schutzgas

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS51119312A (en) *	1975-04-12	1976-10-19	Nippon Steel Corp	An annular apparatus for heat treatment
DE2737615C2 (de) *	1977-08-20	1983-10-06	Fa. J. Aichelin, 7015 Korntal	Durchlaufofen für Schutzgasbetrieb
US4299036A (en) *	1979-06-08	1981-11-10	Midland-Ross Corporation	Oven with a mechanism for cascading heated gas successively through separate isolated chambers of the oven
DE3211412A1 (de) *	1982-03-27	1983-09-29	MAHLER Dienstleistungs-GmbH Löten-Härten-Anlagenbau, 7300 Esslingen	Anordnung zur steuerung eines innerhalb eines raumes umgewaelzten mediumstroms
DE3343654C2 (de) *	1983-12-02	1985-08-29	Reiner 7302 Ostfildern Sarnes	Verfahren zum Abgrenzen von Schutzgaszonen in Durchlauföfen
DE3347145A1 (de) *	1983-12-27	1985-07-18	Adam Opel AG, 6090 Rüsselsheim	Verfahren und anordnung zur aufkohlung der randschichten metallischer werkstuecke
US4596526A (en) *	1985-03-04	1986-06-24	Worthington Industries, Inc.	Batch coil annealing furnace and method
US4867675A (en) *	1988-06-15	1989-09-19	Blackman Calvin C	Method and apparatus for quickly purging atmosphere gas from bell furnace
FR2660744B1 (fr) *	1990-04-04	1994-03-11	Air Liquide	Four a cloches.

1991
- 1991-09-09 DE DE4129879A patent/DE4129879A1/de not_active Withdrawn
1992
- 1992-08-27 DE DE59209570T patent/DE59209570D1/de not_active Expired - Fee Related
- 1992-08-27 EP EP92114598A patent/EP0531810B1/fr not_active Expired - Lifetime

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO1999002287A1 (fr) *	1997-07-07	1999-01-21	Norsk Hydro Asa	Procede de fusion de magnesium, sans emissions

Also Published As

Publication number	Publication date
DE4129879A1 (de)	1993-03-11
EP0531810B1 (fr)	1998-11-25
DE59209570D1 (de)	1999-01-07
EP0531810A3 (en)	1995-02-15

Publication	Publication Date	Title
EP0141061A1 (fr)	1985-05-15	Procédé et dispositif pour la régulation d'une grandeur
DE2851256C2 (fr)	1992-03-12
DE2455585C3 (de)	1980-03-20	Verfahren zum Abkühlen von heifieminsbesondere staubbeladenem-Rauchgas in einem Wärmeaustauscher und Vorrichtung zum Durchführen des Verfahrens
DE69004054T2 (de)	1994-02-10	Verfahren und Vorrichtung zum kontinuierlichen Abstechen von Metall und Schlacke im geschmolzenem Zustand.
EP0531810A2 (fr)	1993-03-17	Procédé pour changer l'athmosphère d'un four industriel
EP0156147B1 (fr)	1987-07-22	Procédé et dispositif pour le recuit de pièces métalliques
DE3341294C2 (fr)	1992-08-06
DE19641432A1 (de)	1998-04-23	Verfahren und Einrichtung zur Vorausberechnung von vorab unbekannten Parametern eines industriellen Prozesses
DE3103730C2 (fr)	1988-11-03
DE10339595A1 (de)	2005-04-07	Verfahren zur Vorhersage und Steuerung der Vergießbarkeit von Flüssigstahl
DE3706257C1 (en)	1988-04-21	Process and device for producing surface layers on iron-containing components
DE2501050A1 (de)	1975-07-24	Verfahren zum formwalzen von metallischem werkstoff
EP1011037A2 (fr)	2000-06-21	Procédé et dispositif de régulation de la température de l'eau dans un chauffe-eau
DE2045109C3 (de)	1985-08-01	Verfahren und Vorrichtung zur Steuerung der Rösttemperatur bei der Oxidationsröstung von metallsulfidhaltigen Konzentraten
DE3725174A1 (de)	1989-02-09	Verfahren zum blank- und rekristallisationsgluehen
DE4236080B4 (de)	2004-10-21	Verfahren zum Betreiben eines Lichtbogenofens
DE3024406C2 (de)	1986-04-30	Verfahren zum Betreiben einer Gasaufkohlungsanlage
DE2637433A1 (de)	1977-03-10	Verfahren zur steuerung der agglomeration von eisenerzen
DE4204060A1 (de)	1993-08-12	Verfahren und vorrichtung zur regelung des drucks in behaeltern, insbesondere in dosier- und niederdruckoefen sowie metallpumpen
DE2408984C3 (de)	1978-08-17	Verfahren zur Erzeugung definierter Nitrierschichten auf Eisen und Eisenlegierungen in einer sauerstoffhaltigen Gasatmosphäre und Anordnung zur Herstellung und Konstanthaltung der dafür erforderlichen Ausgangsgasgemische
DE967916C (de)	1957-12-27	Verfahren und Vorrichtung zum Betrieb eines Zugreglers
DE3226582A1 (de)	1984-01-19	Vorrichtung zum kuehlen von stabmaterial
DE604120C (de)	1934-10-15	Verfahren und Vorrichtung zur Aufrechterhaltung einer gleichmaessigen Atmosphaere in der Behandlungskammer eines Ofens
DE2315540C3 (de)	1983-02-17	Vorrichtung zur Regelung des Mischungsverhältnisses zweier in je einer Leitung einer Anlage zugeführten Gase
DE1758252C3 (de)	1977-12-29	Verfahren zum Abgleichen des Gasdrucks eines Sauerstoffaufblaskonverters auf atmosphärischen Druck

Legal Events

Date	Code	Title	Description
1993-01-29	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
1993-03-17	AK	Designated contracting states	Kind code of ref document: A2 Designated state(s): BE DE FR GB NL
1994-12-27	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
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1995-09-06	17P	Request for examination filed	Effective date: 19950711
1995-09-20	17Q	First examination report despatched	Effective date: 19950804
1995-10-25	RAP1	Party data changed (applicant data changed or rights of an application transferred)	Owner name: LOI THERMPROCESS GMBH
1998-03-03	GRAG	Despatch of communication of intention to grant	Free format text: ORIGINAL CODE: EPIDOS AGRA
1998-05-11	GRAG	Despatch of communication of intention to grant	Free format text: ORIGINAL CODE: EPIDOS AGRA
1998-05-11	GRAH	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOS IGRA
1998-06-29	GRAH	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOS IGRA
1998-10-09	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1998-11-25	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): BE DE FR GB NL
1998-11-25	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: 19981125 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19981125
1999-01-07	REF	Corresponds to:	Ref document number: 59209570 Country of ref document: DE Date of ref document: 19990107
1999-02-12	ET	Fr: translation filed
1999-04-14	RIN2	Information on inventor provided after grant (corrected)	Free format text: SCHEUERMANN, WALTER, DIPL.-ING.DR.TECHN. * HOEHNER, FRIEDRICH
1999-04-14	RTI2	Title (correction)	Free format text: PROCESS TO CHANGE AN INDUSTRIAL FURNACE ATMOSPHERE
1999-05-03	NLV1	Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
1999-05-26	GBV	Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]	Effective date: 19981125
1999-10-01	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
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EP0531810A2 - Procédé pour changer l'athmosphère d'un four industriel - Google Patents

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Definitions

Landscapes

Applications Claiming Priority (2)

Publications (3)

Family

ID=6440164

Family Applications (1)

Country Status (2)

Cited By (1)

Families Citing this family (1)

Family Cites Families (9)

Cited By (1)

Also Published As

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