EP0352777A1 - Apparatus to run a burner with high exit speeds of the gas mixture - Google Patents

Apparatus to run a burner with high exit speeds of the gas mixture Download PDF

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Publication number
EP0352777A1
EP0352777A1 EP89113814A EP89113814A EP0352777A1 EP 0352777 A1 EP0352777 A1 EP 0352777A1 EP 89113814 A EP89113814 A EP 89113814A EP 89113814 A EP89113814 A EP 89113814A EP 0352777 A1 EP0352777 A1 EP 0352777A1
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EP
European Patent Office
Prior art keywords
burner
oxygen gas
line
high exit
gas supply
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Granted
Application number
EP89113814A
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German (de)
French (fr)
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EP0352777B1 (en
Inventor
Klaus Dipl.-Ing. Schumacher
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Linde GmbH
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Linde GmbH
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Priority to AT89113814T priority Critical patent/ATE91772T1/en
Publication of EP0352777A1 publication Critical patent/EP0352777A1/en
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Publication of EP0352777B1 publication Critical patent/EP0352777B1/en
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    • 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

Definitions

  • the invention relates to a method and a device for operating a burner with high exit speeds of the combustion gas mixture, the burner being supplied with fuel gas and oxygen gas.
  • Processes with high exit speeds of the fuel gas-oxygen gas mixture from burners are used in many ways. Important areas of application are, for example, flame blasting, heating processes, hardening processes, etc.
  • a major problem that arises with these processes is that the burner flame is free-burning, ie when burning without a workpiece being in the burner flame, for example, due to the high Remove the exit velocity of the gas mixture very far from the burner. This is referred to as lifting the flame off the burner. which often causes the burner to go out.
  • the back pressure which can be builds up the flame arranged workpiece, prevents lifting of the flame. If the burner swings out of its position or the workpiece is changed, for example, the flame may lift off and go out. Thereupon the burner has to be re-ignited and the setting of its normal function has to be awaited again. This therefore leads to undesired disruptions and interruptions in a process.
  • the aim of the proposed method is therefore to achieve an improvement in the operation of a burner with high exit speeds.
  • This object is achieved in that when a high exit velocity of the combustion gas mixture is required, this is brought about by increasing the oxygen gas supply, while at other times the oxygen gas supply is reduced in such a way that an approximately neutral, non-lifting flame is produced.
  • This measure ensures that the burner flame is lifted and extinguished in corresponding operating situations, e.g. when swiveling out and putting on the burner again, because in these phases the oxygen or air supply and thus the total gas throughput through the burner is reduced.
  • a device for performing the method consists of a burner with a controllable fuel gas and an oxygen gas supply line and has in particular the feature that the oxygen gas supply line is branched into a base line and an additional line at least on a partial route, both in the A control valve is arranged in the base line as well as in the additional line and a switching element for closing and opening the additional line is also located in the additional line.
  • the switchable additional line part of the amount of oxygen gas can be switched on and off independently.
  • the pressures on the control valves are set so that an approximately neutral, non-lifting flame is produced without actuation of the switching valve, i.e. with the auxiliary line in the oxygen gas supply closed.
  • the control valve in the additional line of the oxygen gas supply is adjusted so that, when the additional line is open, the necessary additional amount of oxygen gas flows in order to obtain the desired exit velocity of the combustion gases from the burner.
  • the figure shows a burner with gas supply according to the invention.
  • Supply lines 7, 8 for the combustion gases open into a burner 1.
  • Oxygen gas for example oxygen
  • supply line 7 and supply line 8 serves to supply the burner 1 with fuel gas, for example acethylene.
  • the oxygen gas supply line 7 is divided over a section in front of the burner into two branches 9, 10, which are referred to as base line 9 and additional line 10. Both in base line 9 and Additional line 10 and also in the fuel gas supply line 8 there are control valves 3, 6, 2.
  • a switching valve 5 is arranged in the additional line 10, with which the additional line 10 can be opened and closed.
  • control valves 2, 3, 6 are to be set as follows: when the switch 5 is closed, the control valves 2, 3 are adjusted so that there is an approximately neutral flame (mixing ratio of oxygen to acetylene about 1.1: 1) and one Exit velocity of the combustion gas mixture from the burner results in that the burner flame cannot be lifted. When switch 5 is open, the control valve 6 is opened to such an extent that the desired exit velocity of the combustion gas mixture results. The total amount of oxygen gas can be increased by 1.5 to 3 times, which in this operating situation results in a different mixing ratio of the combustion gases than with the switch 5 closed.
  • the invention is based precisely on the knowledge that the mixing ratio can be varied in many applications and it has been shown that an increase in the amount of oxygen gas by 1.5 to 3 times with a skillful setting of the basic amount of oxygen gas and fuel gas is possible in many cases and precisely in the sense the invention is advantageous.
  • the method according to the invention is also particularly suitable for use in continuous production processes, since the switchover between the two operating states can be automated without any problems by using suitable detection, control and switching elements.
  • the method according to the invention for operating burners with high gas mixture outlet speeds thus provides an improvement of such methods, in particular with regard to the risk of the burner flame being lifted off, and can be implemented with relatively little effort.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

The invention relates to a method for running a burner with high exit speeds of the combustion gas mixture. If a burner is run with constant high exit speeds, lift-off of the burner flame and, consequently, extinction of the burner may result, for example, when a workpiece is changed. It is therefore proposed to bring about high exit speeds by increasing the oxygen gas supply only if such high exit speeds are needed, the oxygen gas supply being reduced at other times so that a roughly neutral, non-lifting flame is produced.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Betrieb eines Brenners mit hohen Austrittsgeschwindigkeiten des Verbrennungsgasgemisches, wobei der Brenner mit Brenngas und Sauerstoffgas versorgt wird.The invention relates to a method and a device for operating a burner with high exit speeds of the combustion gas mixture, the burner being supplied with fuel gas and oxygen gas.

Verfahren mit hohen Austrittsgeschwindigkeiten des Brenngas-Sauerstoffgas-Gemisches aus Brennern kommen in vielfacher Weise zur Anwendung. Wichtige Anwendungsgebiete sind z.B. Flammstrahlen, Erhitzungsverfahren, Härteverfahren usw.. Ein wesentliches Problem, das bei diesen Verfahren auftritt, besteht darin, daß sich die Brennerflamme beim freien Brennen, d.h. beim Brennen ohne daß sich z.B. ein Werkstück in der Brennerflamme befindet, aufgrund der hohen Austrittsgeschwindigkeit des Gasgemisches sehr weit vom Brenner entfernen. Dies wird als Abheben der Flamme vom Brenner bezeichnet. wobei es oft zum Erlöschen des Brenners kommt.Normalerweise wird durch den Rückdruck, der sich beispielsweise durch das in der Flamme angeordnete Werkstück aufbaut, ein Abheben der Flamme verhindert. Bei einem Ausschwenken des Brenners aus seiner Position oder einem Wechsel des Werkstückes z.B., kann es aber zu einem Abheben und Erlöschen der Flamme kommen. Daraufhin muß der Brenner neu gezündet und die Einstellung seiner normalen Funktion erst wieder abgewartet werden. Dies führt also zu unerwünschten Störungen und Unterbrechungen eines Ablaufs.Processes with high exit speeds of the fuel gas-oxygen gas mixture from burners are used in many ways. Important areas of application are, for example, flame blasting, heating processes, hardening processes, etc. A major problem that arises with these processes is that the burner flame is free-burning, ie when burning without a workpiece being in the burner flame, for example, due to the high Remove the exit velocity of the gas mixture very far from the burner. This is referred to as lifting the flame off the burner. which often causes the burner to go out. Normally, the back pressure, which can be builds up the flame arranged workpiece, prevents lifting of the flame. If the burner swings out of its position or the workpiece is changed, for example, the flame may lift off and go out. Thereupon the burner has to be re-ignited and the setting of its normal function has to be awaited again. This therefore leads to undesired disruptions and interruptions in a process.

Zielsetzung des vorgeschlagenen Verfahrens ist es deshalb, eine Verbesserung des Betriebes eines Brenners mit hohen Austrittsgeschwindigkeiten zu erreichen.The aim of the proposed method is therefore to achieve an improvement in the operation of a burner with high exit speeds.

Diese Aufgabe wird dadurch gelöst, daß beim Bedarf einer hohen Austrittsgeschwindigkeit des Verbrennungsgasgemisches diese durch Erhöhung der Sauerstoffgaszufuhr bewirkt wird, während zu anderen Zeiten die Sauerstoffgaszufuhr derart herabgesetzt wird, daß eine etwa neutrale, nicht abhebende Flamme entsteht.This object is achieved in that when a high exit velocity of the combustion gas mixture is required, this is brought about by increasing the oxygen gas supply, while at other times the oxygen gas supply is reduced in such a way that an approximately neutral, non-lifting flame is produced.

Durch diese Maßnahme wird erreicht, daß das Abheben und Erlöschen der Brennerflamme in entsprechenden Betriebssituationen, z.B. beim Ausschwenken und neu Aufsetzen des Brenners, vermieden wird, da in diesen Phasen etwa die Sauerstoff- oder Luftzufuhr und somit der gesamte Gasdurchsatz durch den Brenner herabgesetzt wird.This measure ensures that the burner flame is lifted and extinguished in corresponding operating situations, e.g. when swiveling out and putting on the burner again, because in these phases the oxygen or air supply and thus the total gas throughput through the burner is reduced.

Eine Vorrichtung zur Durchführung des verfahrens besteht aus einem Brenner mit einer regelbaren Brenngas- und einer Sauerstoffgasversorgungsleitung und weist insbesondere das Merkmal auf, daß die Sauerstoffgasversorgungsleitung zumindest auf einer Teilstrecke in eine Basisleitung und eine Zusatzleitung verzweigt ist, wobei sowohl in der Basis- als auch in der Zusatzleitung ein Regelventil angeordnet ist und sich darüber hinaus in der Zusatzleitung ein Schaltelement zum Schließen und Öffnen der Zusatzleitung befindet.A device for performing the method consists of a burner with a controllable fuel gas and an oxygen gas supply line and has in particular the feature that the oxygen gas supply line is branched into a base line and an additional line at least on a partial route, both in the A control valve is arranged in the base line as well as in the additional line and a switching element for closing and opening the additional line is also located in the additional line.

Mit Hilfe der schaltbaren Zusatzleitung kann ein Teil der Sauerstoffgasmenge eigenständig zu- und abgeschaltet werden. Bei Brennerbetrieb werden die Drücke an den Regelventilen so eingestellt, daß ohne Betätigung des Schaltventils, also bei geschlossener Zusatzleitung in der Sauerstoffgasversorgung, eine etwa neutrale, nicht abhebende Flamme entsteht. Andererseits wird das Regelventil in der Zusatzleitung der Sauerstoffgasversorgung so justiert, daß bei offener Zusatzleitung, die notwendige Zusatzmenge an Sauerstoffgas fließt, um die gewünschte Austrittsgeschwindigkeit der Verbrennugsgase aus dem Brenner zu erhalten.With the help of the switchable additional line, part of the amount of oxygen gas can be switched on and off independently. During burner operation, the pressures on the control valves are set so that an approximately neutral, non-lifting flame is produced without actuation of the switching valve, i.e. with the auxiliary line in the oxygen gas supply closed. On the other hand, the control valve in the additional line of the oxygen gas supply is adjusted so that, when the additional line is open, the necessary additional amount of oxygen gas flows in order to obtain the desired exit velocity of the combustion gases from the burner.

Im folgenden soll anhand der Figur die Erfindung beispielhaft näher erläutert werden.In the following the invention will be explained in more detail by way of example with reference to the figure.

Die Figur zeigt einen Brenner mit erfindungsgemäßer Gasversorgung.The figure shows a burner with gas supply according to the invention.

In einen Brenner 1 münden Versorgungsleitungen 7, 8 für die Verbrennungsgase. In Versorgungsleitung 7 wird Sauerstoffgas, z.B. Sauerstoff, zugeführt und Versorgungsleitung 8 dient zur Versorgung des Brenners 1 mit Brenngas, z.B. Acethylen. Die Sauerstoffgasversorgungsleitung 7 ist auf einer Teilstrecke vor dem brenner in zwei Zweige 9, 10 aufgeteilt, die als Basisleitung 9 und Zusatzleitung 10 bezeichnet werden. Sowohl in Basisleitung 9 und Zusatzleitung 10 als auch in der Brenngas-­Versorgungsleitung 8 befinden sich Regelventile 3, 6, 2. Darüber hinaus ist in der Zusatzleitung 10 ein Schaltventil 5 angeordnet, mit dem die Zusaztleitung 10 geöffnet und geschlossen werden kann.Supply lines 7, 8 for the combustion gases open into a burner 1. Oxygen gas, for example oxygen, is supplied in supply line 7 and supply line 8 serves to supply the burner 1 with fuel gas, for example acethylene. The oxygen gas supply line 7 is divided over a section in front of the burner into two branches 9, 10, which are referred to as base line 9 and additional line 10. Both in base line 9 and Additional line 10 and also in the fuel gas supply line 8 there are control valves 3, 6, 2. In addition, a switching valve 5 is arranged in the additional line 10, with which the additional line 10 can be opened and closed.

Zur Durchführung des erfindungsgemäßen Verfahrens sind die Regelventile 2, 3, 6 folgendermaßen einzustellen: bei geschlossenem Schalter 5 werden die Regelventile 2, 3 so justiert, daß sich eine etwa neutrale Flamme (Mischungsverhältnis von Sauerstoff zu Acethylen etwa 1,1 : 1) und eine Austrittsgeschwindigkeit des Verbrennungsgasgemisches aus dem Brenner ergibt, die zu keinem Abheben der Brennerflamme führen kann. Bei geöffneter Einstellung von Schalter 5 wird das Regelventil 6 soweit geöffnet, daß die gewünschte Austrittsgeschwindigkeit des Verbrennungsgasgemisches resultiert. Die gesamte Sauerstoffgasmenge kann dabei um das 1,5 bis 3fache erhöht werden, woraus sich in dieser Betriebsituation ein anderes Mischungsverhältnis der Verbrennungsgase als mit geschlossenem Schalter 5 ergibt. Die Erfindung beruht ja gerade auf der Erkenntnis, daß das Mischungsverhältnis in vielen Anwendungsfällen variierbar ist und es hat sich gezeigt, daß eine Erhöhung der Sauerstoffgasmenge um das 1,5 bis 3fache bei geschickter Grundmengeneinstellung von Sauerstoffgas und Brenngas in vielen Fällen möglich und eben im Sinne der Erfindung vorteilhaft ist.To carry out the method according to the invention, the control valves 2, 3, 6 are to be set as follows: when the switch 5 is closed, the control valves 2, 3 are adjusted so that there is an approximately neutral flame (mixing ratio of oxygen to acetylene about 1.1: 1) and one Exit velocity of the combustion gas mixture from the burner results in that the burner flame cannot be lifted. When switch 5 is open, the control valve 6 is opened to such an extent that the desired exit velocity of the combustion gas mixture results. The total amount of oxygen gas can be increased by 1.5 to 3 times, which in this operating situation results in a different mixing ratio of the combustion gases than with the switch 5 closed. The invention is based precisely on the knowledge that the mixing ratio can be varied in many applications and it has been shown that an increase in the amount of oxygen gas by 1.5 to 3 times with a skillful setting of the basic amount of oxygen gas and fuel gas is possible in many cases and precisely in the sense the invention is advantageous.

Bei Bedarf von hohen Austrittsgeschwindigkeiten wird also der Brenner mit geöffnetem Schalters 5 betrieben. In Betriebssituationen, in denen keine hohen Austrittsgeschwindigkeiten notwendig sind und in denen insbesondere die Gefahr des Abhebens und Verlöschens der Brennerflamme besteht, wird durch Schließen des Schalters 5 ein anderer, das Abheben der Brennerflamme vermeidender Betriebszustand hergestellt.If high exit speeds are required, the burner is therefore operated with the switch 5 open. In operating situations where high exit speeds are not necessary and in which there is in particular the risk of the burner flame being lifted off and extinguished, another operating state which avoids lifting the burner flame is produced by closing the switch 5.

Das erfindungsgemäße Verfahren eignet sich besonders auch für die Anwendung in kontinuierlichn Produkttionsabläufen, denn die Umschaltung zwischen den beiden Betriebszuständen kann durch den Einsatz geeigneter Detektions-, Steuer- und Schaltelemente problemlos automatisiert werden.The method according to the invention is also particularly suitable for use in continuous production processes, since the switchover between the two operating states can be automated without any problems by using suitable detection, control and switching elements.

Das erfindungsgemäße Verfahren zum Betreiben von Brennern mit hohen Gasgemisch-Austrittsgeschwindigkeiten liefert also eine Verbesserung derartiger Verfahren insbesondere hinsichtlich der Gefahr des Abhebens der Brennerflamme und ist mit verhältnismäßig geringem Aufwand realisierbar.The method according to the invention for operating burners with high gas mixture outlet speeds thus provides an improvement of such methods, in particular with regard to the risk of the burner flame being lifted off, and can be implemented with relatively little effort.

Claims (2)

1. Verfahren zum Betrieb eines Brenners mit hohen Austrittsgeschwindigkeiten des Verbrennungsgasgemisches bestehend aus Brenngas und Sauerstoffgas, dadurch gekennzeichnet, daß beim Bedarf einer hohen Austrittsgeschwindigkeit des Verbrennungsgasgemisches diese durch Erhöhung der Sauerstoffgaszufuhr bewirkt wird, während zu anderen Zeiten die Sauerstoffgaszufuhr derart herabgesetzt wird, daß eine etwa neutrale, nicht abhebende Flamme entsteht.1. A method for operating a burner with high exit speeds of the combustion gas mixture consisting of fuel gas and oxygen gas, characterized in that when a high exit speed of the combustion gas mixture is required, this is effected by increasing the oxygen gas supply, while at other times the oxygen gas supply is reduced such that a neutral, non-lifting flame is created. 2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 bestehend aus einem Brenner (1) mit Brenngas- und Sauerstoffgasversorgungsleitung (8, 7), dadurch gekennzeichnet, daß die Sauerstoffgasversorgungsleitung (7) zumindest auf einer Teilstrecke in eine Basisleitung (9) und eine Zusatzleitung (10) verzweigt ist, wobei sowohl in der Basis- als auch in der Zusatzleitung ein Regelventil (3, 6) angeordnet ist und sich darüber hinaus in der Zusatzleitung ein Schaltelement (5) zum Schließen und Öffnen der Zusatzleitung befindet.2. Device for performing the method according to claim 1 consisting of a burner (1) with fuel gas and oxygen gas supply line (8, 7), characterized in that the oxygen gas supply line (7) at least on a partial route into a base line (9) and an additional line (10) is branched, a control valve (3, 6) being arranged both in the base line and in the additional line and a switching element (5) for closing and opening the additional line also being located in the additional line.
EP89113814A 1988-07-28 1989-07-26 Apparatus to run a burner with high exit speeds of the gas mixture Expired - Lifetime EP0352777B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89113814T ATE91772T1 (en) 1988-07-28 1989-07-26 DEVICE FOR OPERATION OF A BURNER WITH HIGH GAS MIXTURE OUTLET VELOCITY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3825723A DE3825723A1 (en) 1988-07-28 1988-07-28 METHOD AND DEVICE FOR OPERATING A BURNER AT HIGH GAS MIXTURE LEAKING SPEEDS
DE3825723 1988-07-28

Publications (2)

Publication Number Publication Date
EP0352777A1 true EP0352777A1 (en) 1990-01-31
EP0352777B1 EP0352777B1 (en) 1993-07-21

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EP89113814A Expired - Lifetime EP0352777B1 (en) 1988-07-28 1989-07-26 Apparatus to run a burner with high exit speeds of the gas mixture

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EP (1) EP0352777B1 (en)
AT (1) ATE91772T1 (en)
DE (2) DE3825723A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325099A1 (en) * 1975-09-18 1977-04-15 Utilisation Ration Gaz Mixture ratio regulation for two gaseous fluids - uses predetermined calibrated orifices to produce constant ratio independent of flow
US4644967A (en) * 1983-11-25 1987-02-24 Vapor Energy Corp. Fluid flow control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325099A1 (en) * 1975-09-18 1977-04-15 Utilisation Ration Gaz Mixture ratio regulation for two gaseous fluids - uses predetermined calibrated orifices to produce constant ratio independent of flow
US4644967A (en) * 1983-11-25 1987-02-24 Vapor Energy Corp. Fluid flow control system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 268 (M-424)(1991) 25 Oktober 1985, & JP-A-60 114625 (YAMATAKE HONEYWELL K.K.) 21 Juni 1985, *

Also Published As

Publication number Publication date
ATE91772T1 (en) 1993-08-15
EP0352777B1 (en) 1993-07-21
DE58904952D1 (en) 1993-08-26
DE3825723A1 (en) 1990-02-01

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