EP0088717A1 - Verfahren zum Optimieren des Betriebes eines Ofens - Google Patents

Verfahren zum Optimieren des Betriebes eines Ofens Download PDF

Info

Publication number: EP0088717A1
Authority: EP; European Patent Office
Prior art keywords: oven; temperature; fuel; flow rate; furnace
Prior art date: 1982-03-09
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

EP83630042A

Other languages

English (en)

French (fr)

Other versions

EP0088717B1 (de

Inventor

François Krippler

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.)

Arcelor Luxembourg SA

Original Assignee

Arbed SA

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.)

1982-03-09

Filing date

1983-03-07

Publication date

1983-09-14

1983-03-07 Application filed by Arbed SA filed Critical Arbed SA

1983-09-14 Publication of EP0088717A1 publication Critical patent/EP0088717A1/de

1987-11-19 Application granted granted Critical

1987-11-19 Publication of EP0088717B1 publication Critical patent/EP0088717B1/de

Status Expired legal-status Critical Current

Images

Classifications

- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2221/00—Pretreatment or prehandling
- F23N2221/06—Preheating gaseous fuel
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2221/00—Pretreatment or prehandling
- F23N2221/08—Preheating the air
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/02—Measuring filling height in burners
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/10—Measuring temperature stack temperature
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/04—Air or combustion gas valves or dampers in stacks
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/06—Air or combustion gas valves or dampers at the air intake
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/10—Air or combustion gas valves or dampers power assisted, e.g. using electric motors
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

the invention relates to a method and a device for optimizing the operation of an oven, in particular an industrial oven used for heating metallic materials (Pit oven, beam oven, pushing oven etc.). It more particularly relates to the optimization of the ratio between the fuel and the oxidizer, with the aim of having in the exhaust gases only compounds which are neither oxidizing nor oxidizable.
the detector is in the form of a long refractory tube housing a detection cell and a thermocouple.
the detector must be in direct contact with the gases to be analyzed and preferably be placed in the middle of the flue. Given the thickness of the flue walls covered with refractories, this last condition is difficult to achieve given the length of the refractory tubes offered on the market.
the temperature variations to which this probe is subjected strongly influence the measurement results, so a correction as a function of temperature is essential.
the detector is in the form of a measuring cell which is mounted in a chamber of small dimensions, in which the temperature is kept constant at around 800 ° C.
a pump sucks the fumes to be analyzed through a sampling probe fitted with filters and discharges them through the analysis chamber.
the depth of the sample can be obtained using refractory tubes, which are cut to the desired length.
the disadvantages consist in a complex sampling and treatment of smoke with probes, filters, purges and valves which require a lot of maintenance and which represent as many possibilities of faults as for example the air intake in the vacuum lines.
the object of the invention is to propose a method for regulating an oven which does not have the defects described above, namely a limited lifetime of the measuring cells, high installation and purchase costs and reliability. of questionable operation.
the advantages obtained by the invention essentially consist in that the optimal ratio between the fuel and the oxidizer is not determined by means of fragile gas analysis devices, but by electronic components which calculate the optimal conditions for operation based on the characteristics of the oven which have been carefully noted once and for all. These characteristics can be checked once a year or in the event of operating anomalies. The production costs of the b _y-stème are reduced and the apparatus requires practically no maintenance.
FIG. 1 a Pit 1 furnace comprising a device 2 for evacuating combustion fumes which pass through two heat exchangers 3 and 4 serving to preheat the fuel and the oxidizer.
the fuel in this case is blast furnace gas (supplied via line 5a) enriched with natural gas (supplied via line 5b) so as to maintain a constant PCI (intrinsic heat capacity).
PCI intrinsic heat capacity
the constant energy capacity of the fuel is ensured by a dosing system 5c. It should be noted in passing that when using pure natural gas or liquid fuel, there is no preheating.
the fuel flow is controlled by a fan 6a and by a valve 6c controlled by a servo motor 6b.
This device is preferably located upstream of the exchanger 4.
oxidizer it is possible to use air optionally enriched with oxygen, the flow rate of which is likewise controlled by a fan 7a and a valve 7c controlled by a servo-motor 7b.
the valve 7c is located between the heat exchanger 3 and a flow meter 15.
the fuel and the oxidizer are then supplied via the lines 8 resp. 9 to burner 10 of the oven.
a pressure sensor 11 monitors the pressure inside the furnace and transmits the measured values to a pressure regulating system 12a controlling a servomotor 12b, which acts on a valve 12c, preferably mounted downstream of the exchanger heat 4, in the flue evacuation chimney.
the temperature of the combustion fumes is continuously monitored upstream and downstream of the heat exchangers 3,4 by the sensors 13 b and 13 c and safety devices 16a and 16b bring ambient air into the device. smoke evacuation 2 when the measured temperatures exceed predetermined limits. It should also be noted that the temperature of the fuel as well as that of the oxidizer are measured downstream of the heat exchangers 3 and 4, by the sensors 13d, 13e.
this curve is shown for an excess of oxygen of 0.4% with the air flow rate on the abscissa and the combustible gas flow rate on the ordinate.
the oven temperature was kept constant at 1320 ° C.
the gas analyzer is short-circuited 17 and the oven is operated automatically.
the data defining the residual quantity of oxygen or of CO desired in the combustion fumes is entered into the calculation system 24.
the device 22 is adjusted to the desired temperature.
the actual oven temperature, measured using the sensor 18, is compared to the desired temperature in a comparator 21 which transmits, depending on the result, an opening or closing signal to the servomotor 7b coupled to the valve 7c.
the actual air flow is measured using a flow meter 15, connected to a flow-voltage converter (analog or digital) 23 which communicates the measurement result to the calculation system 24.
the system 24 transmits to the regulator 25, for each oxidant flow rate measured, the fuel flow rate required to have combustion in accordance with the residual oxygen or CO concentration desired in the combustion fumes.
the calculation system 24 is also connected to the temperature sensor 18 so that it bases its calculations on the data which are in agreement not with the chosen temperature, but with the instantaneous temperature of the oven. .
the calculation system 24 can be reduced to a simple analog circuit in which the measured air flow is multiplied by a factor equal to the slope of the line shown in fig.2 and a fixed value is subtracted depending on where the line crosses the ordinate axis.
the operation of the oven is based on a single response curve corresponding to the operating temperature. chosen oven and no account is taken of instantaneous variations in the temperature thereof.
the optimum fuel value which corresponds to the measured air flow is transmitted to the regulator 25 which acts on a servo motor 6b connected to the valve 6c.
the actual fuel flow is monitored using the flow meter 14 and compared, after conversion in the flow-voltage converter 26, with the set value calculated by the device 24.
the fuel flow rate was adjusted in accordance with the oxidant flow rate. The reverse is also true.

Landscapes

Engineering & Computer Science (AREA)
Chemical & Material Sciences (AREA)
Combustion & Propulsion (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Regulation And Control Of Combustion (AREA)

EP83630042A 1982-03-09 1983-03-07 Verfahren zum Optimieren des Betriebes eines Ofens Expired EP0088717B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
LU83989		1982-03-09
LU83989A LU83989A1 (fr)	1982-03-09	1982-03-09	Procede et dispositif pour optimiser le fonctionnement d'un four

Publications (2)

Publication Number	Publication Date
EP0088717A1 true EP0088717A1 (de)	1983-09-14
EP0088717B1 EP0088717B1 (de)	1987-11-19

Family

ID=19729830

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP83630042A Expired EP0088717B1 (de)	1982-03-09	1983-03-07	Verfahren zum Optimieren des Betriebes eines Ofens

Country Status (3)

Country	Link
EP (1)	EP0088717B1 (de)
DE (1)	DE3374591D1 (de)
LU (1)	LU83989A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4645450A (en) *	1984-08-29	1987-02-24	Control Techtronics, Inc.	System and process for controlling the flow of air and fuel to a burner
EP0341323A1 (de) *	1988-05-07	1989-11-15	Honeywell B.V.	Regeleinrichtung für Gasbrenner
FR2712961A1 (fr) *	1993-11-26	1995-06-02	Lorraine Laminage	Réglage en temps réel d'un brûleur à combustible de caractéristiques variables, notamment pour four métallurgique de réchauffage.
US6213758B1 (en)	1999-11-09	2001-04-10	Megtec Systems, Inc.	Burner air/fuel ratio regulation method and apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3284615A (en) *	1956-09-24	1966-11-08	Burroughs Corp	Digital control process and system
DE2745459A1 (de) *	1976-12-14	1978-06-15	Measurex Corp	Einrichtung zur steuerung des verbrennungswirkungsgrades
US4097218A (en) *	1976-11-09	1978-06-27	Mobil Oil Corporation	Means and method for controlling excess air inflow
EP0030736A2 (de) *	1979-12-17	1981-06-24	SERVO-Instrument in Deutschland Alleinvertrieb der BEAB-Regulatoren GmbH & Co KG	Regelvorrichtung für die Verbrennungsluftmenge einer Feuerstätte
DE3010147A1 (de) *	1980-03-15	1981-09-24	Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt	Digitale anordnung zur steuerung eines gasbrenners

1982
- 1982-03-09 LU LU83989A patent/LU83989A1/fr unknown
1983
- 1983-03-07 DE DE8383630042T patent/DE3374591D1/de not_active Expired
- 1983-03-07 EP EP83630042A patent/EP0088717B1/de not_active Expired

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3284615A (en) *	1956-09-24	1966-11-08	Burroughs Corp	Digital control process and system
US4097218A (en) *	1976-11-09	1978-06-27	Mobil Oil Corporation	Means and method for controlling excess air inflow
DE2745459A1 (de) *	1976-12-14	1978-06-15	Measurex Corp	Einrichtung zur steuerung des verbrennungswirkungsgrades
EP0030736A2 (de) *	1979-12-17	1981-06-24	SERVO-Instrument in Deutschland Alleinvertrieb der BEAB-Regulatoren GmbH & Co KG	Regelvorrichtung für die Verbrennungsluftmenge einer Feuerstätte
DE3010147A1 (de) *	1980-03-15	1981-09-24	Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt	Digitale anordnung zur steuerung eines gasbrenners

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
INSTRUMENTS & CONTROL SYSTEMS, vol. 49, no. 6, juin 1976, pages 25-32, Radnor, PA, USA *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4645450A (en) *	1984-08-29	1987-02-24	Control Techtronics, Inc.	System and process for controlling the flow of air and fuel to a burner
EP0341323A1 (de) *	1988-05-07	1989-11-15	Honeywell B.V.	Regeleinrichtung für Gasbrenner
FR2712961A1 (fr) *	1993-11-26	1995-06-02	Lorraine Laminage	Réglage en temps réel d'un brûleur à combustible de caractéristiques variables, notamment pour four métallurgique de réchauffage.
EP0661499A1 (de) *	1993-11-26	1995-07-05	Sollac S.A.	Echtzeitregelung eines Brenner für Brenngase mit underschiedlichen Eigenschaften, insbesondere für metallurgischen Ofen zum Wärmen
TR28665A (tr) *	1993-11-26	1996-12-25	Lorraine Laminage	Bilhassa bir metalörjik isitma ocagi icin, degisken özelliklere sahip bir gaz brülörünün hakiki zamanla ayarlanmasi.
US6213758B1 (en)	1999-11-09	2001-04-10	Megtec Systems, Inc.	Burner air/fuel ratio regulation method and apparatus

Also Published As

Publication number	Publication date
LU83989A1 (fr)	1983-11-17
EP0088717B1 (de)	1987-11-19
DE3374591D1 (en)	1987-12-23

Publication	Publication Date	Title
EP0949477A1 (de)	1999-10-13	Verfahren zum Betrieb eines Ofens und Vorrichtung dafür
EP0971171B1 (de)	2003-08-06	Verbrennunungsverfahren eines Brennstoffes mit einem sauerstoffreichen Oxidationsmittel
EP2507551A1 (de)	2012-10-10	Verfahren zur korrektur der verbrennungseinstellungen eines brennkammernsatzes und vorrichtung zur umsetzung des verfahrens
FR2946737A1 (fr)	2010-12-17	Procede de regulation d'un four de cuisson de blocs carbones et four adapte a sa mise en oeuvre.
EP0088717B1 (de)	1987-11-19	Verfahren zum Optimieren des Betriebes eines Ofens
FR2597961A1 (fr)	1987-10-30	Bruleur equipe d'un dispositif de commande perfectionne
EP0661499B1 (de)	1999-01-13	Echtzeitregelung eines Brenner für Brenngase mit unterschiedlichen Eigenschaften, insbesondere für metallurgischen Ofen zum Wärmen
EP0561723B1 (de)	1999-01-13	Verfahren und Vorrichtung zur Regelung der Luftmenge bei der Nachverbrennung in einem Abgassammler eines metallurgischen Reaktors
FR2539230A1 (fr)	1984-07-13	Procede de determination de la teneur en imbrules des produits residuels de combustion d'un combustible et dispositif pour la mise en oeuvre dudit procede
FR2975463A1 (fr)	2012-11-23	Dispositif et procede de regulation de la combustion d'une chaudiere a biomasse
FR2837841A1 (fr)	2003-10-03	Generateur de combustible gazeux
EP0864953B1 (de)	2002-08-07	Überwachungsanlage für Atmosphärenerzeugungsgerät
BE1024418B1 (fr)	2018-02-16	Dispositif d'appareil de chauffage
EP0539309A1 (de)	1993-04-28	Verfahren und Einrichtung zur Lastregelung eines Kessels mit mechanischer Feuerungsroste
EP0221799A1 (de)	1987-05-13	Verfahren und Einrichtung für eine Gasbrennerverbrennungsregelung eines Wärme- oder Kraftgenerators, wie eines Heizkessels oder ähnlichem um eine bestimmte Verbrennung zu erzielen
WO2002088680A1 (fr)	2002-11-07	Procede de controle d'un produit traite dans un four et four ainsi equipe de moyens de controle
FR2707769A1 (fr)	1995-01-20	Dispositif de mesure ou de régulation de débit de gaz.
EP1635117A1 (de)	2006-03-15	Verfahren zur Regelung des Luft-Brennstoffverhältnisses eines Brenners und Brenner zur Durchführung dieses Verfahrens
FR2545935A1 (fr)	1984-11-16	Procede et moyen pour mesurer la temperature des cendres dans une unite de gazeification
EP1069203A2 (de)	2001-01-17	Sonde zur kontinuierlichen Regelung der Gasatmosphere in Nitrier- oder Nitrokarburierverfahren in Ofen mit atmospherischem oder niedrigem Druck
JPS63105321A (ja)	1988-05-10	燃焼制御方法
WO2010119220A1 (fr)	2010-10-21	Dispositif et procede pour la mesure de la temperature du point de rosee d'un element gazeux
FR2859467A1 (fr)	2005-03-11	Procede de controle de la fusion de verre dans un four
JPH07107445B2 (ja)	1995-11-15	燃焼制御方法
FR2683044A1 (fr)	1993-04-30	Procede et dispositif pour analyser par decomposition thermique fractionnee au moins un compose inclusionnaire d'un corps.

Legal Events

Date	Code	Title	Description
1983-07-16	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
1983-09-14	AK	Designated contracting states	Designated state(s): BE DE FR GB IT LU NL
1983-12-07	RBV	Designated contracting states (corrected)	Designated state(s): BE DE FR GB IT LU NL
1984-05-16	17P	Request for examination filed	Effective date: 19840309
1986-03-12	17Q	First examination report despatched	Effective date: 19860127
1987-07-08	RBV	Designated contracting states (corrected)	Designated state(s): BE DE FR GB IT NL
1987-10-03	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
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