EP0807787B1 - Burner - Google Patents

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Publication number
EP0807787B1
EP0807787B1 EP97810221A EP97810221A EP0807787B1 EP 0807787 B1 EP0807787 B1 EP 0807787B1 EP 97810221 A EP97810221 A EP 97810221A EP 97810221 A EP97810221 A EP 97810221A EP 0807787 B1 EP0807787 B1 EP 0807787B1
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EP
European Patent Office
Prior art keywords
burner
fuel
air
overlap angle
increases
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.)
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EP97810221A
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German (de)
French (fr)
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EP0807787A2 (en
EP0807787A3 (en
Inventor
Klaus Dr. Döbbeling
Hans Peter Knöpfel
Dieter Winkler
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General Electric Switzerland GmbH
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Alstom Schweiz AG
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Publication of EP0807787A2 publication Critical patent/EP0807787A2/en
Publication of EP0807787A3 publication Critical patent/EP0807787A3/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D17/00Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • F23D17/002Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or liquid fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00Combustion apparatus characterised by arrangements for air supply
    • F23C7/002Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/07002Premix burners with air inlet slots obtained between offset curved wall surfaces, e.g. double cone burners

Definitions

  • the invention relates to the field of combustion technology. It concerns a double cone type burner, in which the combustion air flow before its inflow gaseous fuel is fed into the burner interior becomes.
  • EP 0 321 809 B1 describes the basic structure of a burner the double-cone design known to the invention refers.
  • This burner consists essentially of hollow, partial conical bodies that complement one another, with tangential air inlet slots and feeds for gaseous and liquid fuels where the central axes the hollow partial cone body is widening in the direction of flow Have a taper and in the longitudinal direction to each other run staggered.
  • In the part cone bodies formed conical interior is a fuel nozzle on the burner head placed.
  • the gaseous fuel becomes the combustion air flow prior to its inflow into the interior of the burner arranged along the entry slots Gas injectors supplied.
  • the formation of the fuel / air mixture thus happens directly at the end of the tangential air inlet slots.
  • the air entry level and the gas entry level (Perforation level) thus fall with this known one State of the art together.
  • the last gas injectors along the air inlet slots are very close to in this known prior art Burner outlet and therefore also near the flame.
  • the length of the pre-mixing section is therefore very high at these points in short so that the fuel coming from these is downstream last injector located is bad can mix with the air. Because of the bad premix of the fuel with air arise locally with a rich fuel / air mixture, which leads to higher flame temperatures and thus also leads to higher NOx values. Furthermore the additional load on the firing front is in these regions so high that they overheat and the material there is protected by an expensive zirconium coating must become.
  • a burning that corresponds to the preamble of claim 1 is known from EP 0 641 971 A2
  • the invention tries to avoid all of these disadvantages. It is based on the task of a double cone burner to create which is simply constructed and therefore is inexpensive to manufacture and in which an improved Premix the gaseous fuel from the downstream located last gas injection nozzles with the combustion air takes place, so that compared to the known prior art the NOx emissions are reduced and the burner front is thermally less stressed, so that expensive special coatings the burner front can be dispensed with.
  • this is achieved in that a burner according to the preamble of claim 1 the overlap angle in Flow direction of the burner increases and at the same time Increase in the overlap angle of the distance between the fuel injectors increases from the air inlet level into the burner. The fuel injection level and the air entry level fall therefore no longer together, but the fuel injection level changes position along the burner to the air inlet level.
  • the advantages of the invention include that in the area of the downstream fuel injectors Due to the increased premixing distance, the premixing of the gaseous fuel improved with the combustion air will, so the NOx emissions and the thermal load the burner front can be reduced.
  • the burner stands out due to a more stable flame position and less pulsations out.
  • the overlap angle in the cone tip is 0 ° and steady up to the burner front increases, the maximum overlap angle being 90 °.
  • FIG. 1 shows a perspective view of the inventive Burner.
  • FIG. 1 shows a perspective view of the inventive Burner.
  • the two partial cone bodies 1, 2 each have a cylindrical starting part 9, 10 which also run offset to each other, so that this too Area the tangential air inlet slots 5, 6 are present are.
  • In this cylindrical initial part 9, 10 is a nozzle 11 for atomizing the liquid fuel 12 accommodated.
  • the burner can also be used without the cylindrical Initial parts 9, 10 are designed so that it is purely conical is trained. Then the fuel nozzle 11 is directly in the Cone tip housed.
  • the two partial cone bodies 1, 2 each have a fuel line 13, 14 with openings 15 are provided, which represent fuel injectors.
  • the fuel injectors 15 make gaseous fuel 16 through the tangential air inlet slots 5, 6 flowing combustion
  • Combustion chamber side 17 has a burner as an anchor for the partial cone body 1, 2 serving front plate 18 with a Number of holes 19 through which, if necessary, dilution or cooling air 20 the front part of the combustion chamber 17th or whose wall can be fed.
  • liquid fuel 12 is used to operate the burner, so it flows through the nozzle 11 and is in one injected acute angle into the burner interior 17, wherein a homogeneous fuel spray is established.
  • the conical Liquid fuel profile 23 is of a tangentially flowing rotating combustion air flow 7 enclosed.
  • concentration of the liquid fuel becomes axial 12 continuously through the mixed combustion air 7 reduced.
  • the optimal fuel concentration over the Cross section is only in the area of the vertebral burst, i.e. reached in the area of the backflow zone 24.
  • the ignition takes place at the top of the backflow zone 24. Only at this point creates a stable flame front 25.
  • the flame stabilization results from an increase in the swirl number in the direction of flow along the cone axis. The flame strikes back now does not occur inside the burner.
  • the overlap two partial cone bodies 1, 2 partially, the overlap angle ⁇ in the cone tip is 0 ° (i.e. lies there no overlap before) and ⁇ then in the flow direction up to to the burner outlet, i.e. up to the front plate 18, increases continuously. 90 ° can be specified as the maximum overlap angle ⁇ become.
  • the fuel injectors 15 are further upstream.
  • the air inlet level 21 and the fuel injection level thus fall 22 no longer together.
  • the fuel injection level 22 changes direction along the double cone burner Burner front their position to air inlet level 21 so large that ever longer pre-mixing distances from the respective Fuel injection of the gaseous fuel 16 can be reached up to the air inlet level 21.
  • the flame compared to the previously known State of the art in which the partial cone bodies 1, 2 do not overlap and the fuel injection plane 22 of the Air inlet level 21 corresponds to a more stable position.
  • the inventive Brenner also is less prone to pulsation. It is constructive designed quite simply (e.g. without complicated Transition pieces to extend the premix section) and therefore inexpensive to manufacture.
  • inventive Solution can also be used for burners, which consist of more than two partial cone bodies, e.g. for so-called Four slot burner.

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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)

Description

Technisches GebietTechnical field

Die Erfindung bezieht sich auf das Gebiet der Verbrennungstechnik. Sie betrifft einen Brenner der Doppelkegelbauart, bei welchem dem Verbrennungsluftstrom vor seiner Einströmung in den Brennerinnenraum gasförmiger Brennstoff zugeführt wird.The invention relates to the field of combustion technology. It concerns a double cone type burner, in which the combustion air flow before its inflow gaseous fuel is fed into the burner interior becomes.

Stand der TechnikState of the art

Aus EP 0 321 809 B1 ist der prinzipielle Aufbau eines Brenners der Doppelkegelbauart bekannt, auf den sich die Erfindung bezieht. Dieser Brenner besteht im wesentlichen aus hohlen, sich zu einem Körper ergänzenden Teilkegelkörpern, mit tangentialen Lufteintrittsschlitzen und Zuführungen für gasförmige und flüssige Brennstoffe, bei dem die Mittelachsen der hohlen Teilkegelkörper eine in Strömungsrichtung sich erweiternde Kegelneigung aufweisen und in Längsrichtung zueinander versetzt verlaufen. Im von den Teilkegelkörpern gebildeten kegelförmigen Innenraum ist am Brennerkopf eine Brennstoffdüse plaziert. Der gasförmige Brennstoff wird dem Verbrennungsluftstrom vorgängig seiner Einströmung in den Brennerinnenraum über entlang der Eintrittsschlitze angeordneten Gasinjektoren zugeführt. Die Bildung des Brennstoff/Luft-Gemisches geschieht somit direkt am Ende der tangentialen Lufteintrittsschlitze. Die Lufteintrittsebene und die Gaseintrittsebene (Belochungsebene) fallen somit bei diesem bekannten Stand der Technik zusammen.EP 0 321 809 B1 describes the basic structure of a burner the double-cone design known to the invention refers. This burner consists essentially of hollow, partial conical bodies that complement one another, with tangential air inlet slots and feeds for gaseous and liquid fuels where the central axes the hollow partial cone body is widening in the direction of flow Have a taper and in the longitudinal direction to each other run staggered. In the part cone bodies formed conical interior is a fuel nozzle on the burner head placed. The gaseous fuel becomes the combustion air flow prior to its inflow into the interior of the burner arranged along the entry slots Gas injectors supplied. The formation of the fuel / air mixture thus happens directly at the end of the tangential air inlet slots. The air entry level and the gas entry level (Perforation level) thus fall with this known one State of the art together.

Die Zunahme des Dralles entlang der Kegelachse, verbunden mit der plötzlichen Querschnittserweiterung am Brenneraustritt, führt dazu, dass sich stromab des Brenneraustrittes auf der Brennerachse eine Rückströmzone bildet, die die Flamme stabilisiert. Erst im Staupunkt der Rückströmzone wird die Zündung der Flamme eingeleitet.The increase in twist along the cone axis associated with the sudden cross-sectional expansion at the burner outlet, leads to the fact that downstream of the burner outlet on the Burner axis forms a backflow zone that stabilizes the flame. The ignition only comes on at the stagnation point of the return flow zone initiated the flame.

Die letzten Gasinjektoren entlang der Lufteintrittsschlitze liegen bei diesem bekannten Stand der Technik sehr nahe am Brenneraustritt und somit auch in der Nähe der Flamme. Die Länge der Vormischstrecke ist somit an diesen Stellen sehr kurz, so dass sich der Brennstoff, der aus diesen stromabwärts gelegenen letzten Düsen eingedüst wird, nur schlecht mit der Luft vermischen kann. Durch die schlechte Vormischung des Brennstoffes mit Luft entstehen örtlich Gebiete mit einem fetten Brennstoff/Luft-Gemisch, welches zu höheren Flammentemperaturen und damit auch zu höheren NOx-Werten führt. Ausserdem wird die zusätzliche Belastung für die Brennfront in diesen Regionen so hoch, dass es zu Überhitzungen kommt und das Material dort durch eine teure Zirkonbeschichtung geschützt werden muss.The last gas injectors along the air inlet slots are very close to in this known prior art Burner outlet and therefore also near the flame. The The length of the pre-mixing section is therefore very high at these points in short so that the fuel coming from these is downstream last injector located is bad can mix with the air. Because of the bad premix of the fuel with air arise locally with a rich fuel / air mixture, which leads to higher flame temperatures and thus also leads to higher NOx values. Furthermore the additional load on the firing front is in these regions so high that they overheat and the material there is protected by an expensive zirconium coating must become.

Will man die Vormischstrecke entlang der Brennerachse verlängern, um die NOx-Emissionen zu reduzieren, so ist dazu ein kompliziertes Übergangsstück zwischen dem Brenner und dem nachfolgenden Teil, beispielsweise einem vor der Brennkammer angeordneten Rohr, notwendig. Durch das Strömungsfeld, das der Brenner stromab erzeugt, ergeben sich in dem nachgeschalteten Teil entweder am Rand oder im Zentrum Probleme mit der axialen Geschwindigkeit. Das führt zu Rückzündungen, so dass der Brenner auf diese Weise nicht betrieben werden kann.If you want to extend the pre-mixing section along the burner axis, to reduce NOx emissions complicated transition piece between the burner and the subsequent part, for example one in front of the combustion chamber arranged pipe, necessary. Through the flow field that the burner generated downstream arise in the downstream Part either at the edge or in the center problems with the axial speed. That leads to backfire, so the burner cannot be operated in this way.

Ein Brennen, der dem Oberbegriff des Anspruchs 1 entspricht ist aus der EP 0 641 971 A2 bekannt A burning that corresponds to the preamble of claim 1 is known from EP 0 641 971 A2

Darstellung der ErfindungPresentation of the invention

Die Erfindung versucht, alle diese Nachteile zu vermeiden. Ihr liegt die Aufgabe zugrunde, einen Brenner der Doppelkegelbauart zu schaffen, welcher einfach aufgebaut und damit preiswert zu fertigen ist und bei welchem eine verbesserte Vormischung des gasförmigen Brennstoffes aus den stromabwärts gelegenen letzten Gasinjektionsdüsen mit der Verbrennungsluft stattfindet, so dass gegenüber dem bekannten Stand der Technik die NOx-Emissionen reduziert werden und die Brennerfront thermisch geringer beansprucht wird, so dass auf teure Spezialbeschichtungen der Brennerfront verzichtet werden kann.The invention tries to avoid all of these disadvantages. It is based on the task of a double cone burner to create which is simply constructed and therefore is inexpensive to manufacture and in which an improved Premix the gaseous fuel from the downstream located last gas injection nozzles with the combustion air takes place, so that compared to the known prior art the NOx emissions are reduced and the burner front is thermally less stressed, so that expensive special coatings the burner front can be dispensed with.

Erfindungsgemäss wird dies dadurch erreicht, dass sich bei einem Brenner gemäss dem Oberbegriff des Anspruchs 1 der Überlappungswinkel in Strömungsrichtung des Brenners zunimmt und gleichzeitig mit Zunahme des Überlappungswinkels der Abstand der Brennstoffinjektoren von der Lufteintrittsebene in den Brenner zunimmt. Die Brennstoffinjektionsebene und die Lufteintrittsebene fallen somit nicht mehr zusammen, sondern die Brennstoffinjektionsebene verändert sich entlang des Brenners in der Position zur Lufteintrittsebene.According to the invention, this is achieved in that a burner according to the preamble of claim 1 the overlap angle in Flow direction of the burner increases and at the same time Increase in the overlap angle of the distance between the fuel injectors increases from the air inlet level into the burner. The fuel injection level and the air entry level fall therefore no longer together, but the fuel injection level changes position along the burner to the air inlet level.

Die Vorteile der Erfindung bestehen unter anderem darin, dass im Bereich der stromab gelegenen Brennstoffinjektoren auf Grund der vergrösserten Vormischstrecke die Vormischung des gasförmigen Brennstoffes mit der Verbrennungsluft verbessert wird, so dass die NOx-Emissionen und die thermische Belastung der Brennerfront verringert werden. Der Brenner zeichnet sich durch eine stabilere Flammenposition und geringere Pulsationen aus.The advantages of the invention include that in the area of the downstream fuel injectors Due to the increased premixing distance, the premixing of the gaseous fuel improved with the combustion air will, so the NOx emissions and the thermal load the burner front can be reduced. The burner stands out due to a more stable flame position and less pulsations out.

Es ist besonders zweckmässig, wenn der Überlappungswinkel in der Kegelspitze 0° beträgt und stetig bis zur Brennerfront zunimmt, wobei der maximale Überlappungswinkel 90° beträgt. It is particularly useful if the overlap angle in the cone tip is 0 ° and steady up to the burner front increases, the maximum overlap angle being 90 °.

Wenn in der Kegelspitze keine Überlappung der Teilkegelkörper vorgesehen ist, dann kann weiterhin wie beim bekannten Stand der Technik eine hohe Axialgeschwindigkeit innerhalb des Brenners auf der Symmetrieachse erreicht werden.If there is no overlap of the partial cone bodies in the cone tip is provided, then can continue as in the known state the technology has a high axial speed within the Brenner can be reached on the axis of symmetry.

Kurze Beschreibung der ZeichnungBrief description of the drawing

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung anhand eines Brenners, welcher aus zwei Teilkegelkörpern aufgebaut ist, dargestellt.In the drawing is an embodiment of the invention based on a burner, which consists of two partial cone bodies is presented, layed out.

Es zeigen:

Fig. 1
einen Doppelkegelbrenner in perspektivischer Darstellung;
Fig. 2
einen schematischen Querschnitt des Brenners gemäss Fig. 1 entlang der Ebene II-II;
Fig. 3
einen schematischen Querschnitt des Brenners gemäss Fig. 1 entlang der Ebene III-III;
Fig. 4
einen schematischen Querschnitt des Brenners gemäss Fig. 1 entlang der Ebene IV-IV.
Show it:
Fig. 1
a double cone burner in perspective;
Fig. 2
a schematic cross section of the burner of Figure 1 along the plane II-II.
Fig. 3
a schematic cross section of the burner of Figure 1 along the plane III-III.
Fig. 4
a schematic cross section of the burner according to FIG. 1 along the plane IV-IV.

Es sind nur die für das Verständnis der Erfindung wesentlichen Elemente gezeigt. Die Strömungsrichtungen der verschiedenen Medien sind mit Pfeilen bezeichnet.It is only essential for understanding the invention Elements shown. The flow directions of the different Media are marked with arrows.

Weg zur Ausführung der ErfindungWay of carrying out the invention

Nachfolgend wird die Erfindung anhand eines Ausführungsbeispieles und der Fig. 1 bis 4 näher erläutert.The invention is described below using an exemplary embodiment and FIGS. 1 to 4 explained in more detail.

Fig. 1 zeigt in perspektivischer Darstellung den erfindungsgemässen Brenner. Zum besseren Verständnis ist es vorteilhaft, wenn gleichzeitig zu Fig. 1 die Schnitte in den Fig. 2 bis 4 herangezogen werden.Fig. 1 shows a perspective view of the inventive Burner. For a better understanding, it is advantageous if at the same time as FIG. 1 the sections in FIG. 2 to 4 are used.

Der Brenner gemäss Fig. 1 besteht aus zwei hohlen Teilkegelkörpern 1, 2, die versetzt zueinander aufeinander liegen. Die Versetzung der jeweiligen Mittelachsen 3, 4 der Teilkegelkörper 1, 2 zueinander schafft auf beiden Seiten in spiegelbildlicher Anordnung jeweils einen tangentialen Lufteintrittsschlitz 5, 6, durch welche die Verbrennungsluft 7 in den Innenraum 8 des Brenners gelangt. Die beiden Teilkegelkörper 1, 2 haben jeweils einen zylindrischen Anfangsteil 9, 10, die ebenfalls versetzt zueinander verlaufen, so dass auch in diesem Bereich die tangentiale Lufteintrittsschlitze 5, 6 vorhanden sind. In diesem zylindrischen Anfangsteil 9, 10 ist eine Düse 11 zur Zerstäubung des flüssigen Brennstoffes 12 untergebracht. Der Brenner kann auch ohne die zylindrischen Anfangsteile 9, 10 ausgeführt sein, so dass er rein kegelig ausgebildet ist. Dann ist die Brennstoffdüse 11 direkt in der Kegelspitze untergebracht. Die beiden Teilkegelkörper 1, 2 weisen je eine Brennstoffleitung 13, 14 auf, die mit Öffnungen 15 versehen sind, welche Brennstoffinjektoren darstellen. Durch die Brennstoffinjektoren 15 wird gasförmiger Brennstoff 16 der durch die tangentialen Lufteintrittsschlitze 5, 6 strömenden Verbrennungsluft 7 zugemischt.1 consists of two hollow partial cone bodies 1, 2, which are offset from one another. The Displacement of the respective central axes 3, 4 of the partial cone body 1, 2 to each other creates on both sides in mirror image Arrangement each have a tangential air inlet slot 5, 6, through which the combustion air 7 into the interior 8 of the burner arrives. The two partial cone bodies 1, 2 each have a cylindrical starting part 9, 10 which also run offset to each other, so that this too Area the tangential air inlet slots 5, 6 are present are. In this cylindrical initial part 9, 10 is a nozzle 11 for atomizing the liquid fuel 12 accommodated. The burner can also be used without the cylindrical Initial parts 9, 10 are designed so that it is purely conical is trained. Then the fuel nozzle 11 is directly in the Cone tip housed. The two partial cone bodies 1, 2 each have a fuel line 13, 14 with openings 15 are provided, which represent fuel injectors. The fuel injectors 15 make gaseous fuel 16 through the tangential air inlet slots 5, 6 flowing combustion air 7 admixed.

Brennraumseitig 17 weist der Brenner eine als Verankerung für die Teilkegelkörper 1, 2 dienende Frontplatte 18 mit einer Anzahl Bohrungen 19 auf, durch welche nötigenfalls Verdünnungs- bzw. Kühlluft 20 dem vorderen Teil des Brennraumes 17 bzw. dessen Wand zugeführt werden kann.Combustion chamber side 17 has a burner as an anchor for the partial cone body 1, 2 serving front plate 18 with a Number of holes 19 through which, if necessary, dilution or cooling air 20 the front part of the combustion chamber 17th or whose wall can be fed.

Wird zum Betrieb des Brenners flüssiger Brennstoff 12 verwendet, so strömt dieser durch die Düse 11 und wird in einem spitzen Winkel in den Brennerinnenraum 17 eingedüst, wobei sich ein homogener Brennstoffspray einstellt. Das kegelige Flüssigbrennstoffprofil 23 wird von einem tangential einströmenden rotierenden Verbrennungsluftstrom 7 umschlossen. In axialer Richtung wird die Konzentration des Flüssigbrennstoffes 12 fortlaufend durch die eingemischte Verbrennungluft 7 verringert. Die optimale Brennstoffkonzentration über den Querschnitt wird erst im Bereich des Wirbelaufplatzens, d.h. im Bereich der Rückströmzone 24 erreicht. Die Zündung erfolgt an der Spitze der Rückströmzone 24. Erst an dieser Stelle entsteht eine stabile Flammenfront 25. Die Flammenstabilisation ergibt sich durch Zunahme der Drallzahl in Strömungsrichtung entlang der Kegelachse. Ein Rückschlagen der Flamme in das Innere des Brenners tritt nunmehr nicht auf.If liquid fuel 12 is used to operate the burner, so it flows through the nozzle 11 and is in one injected acute angle into the burner interior 17, wherein a homogeneous fuel spray is established. The conical Liquid fuel profile 23 is of a tangentially flowing rotating combustion air flow 7 enclosed. In The concentration of the liquid fuel becomes axial 12 continuously through the mixed combustion air 7 reduced. The optimal fuel concentration over the Cross section is only in the area of the vertebral burst, i.e. reached in the area of the backflow zone 24. The ignition takes place at the top of the backflow zone 24. Only at this point creates a stable flame front 25. The flame stabilization results from an increase in the swirl number in the direction of flow along the cone axis. The flame strikes back now does not occur inside the burner.

Wird gasförmiger Brennstoff 16 verbrannt, so geschieht die Gemischbildung mit der Verbrennungsluft 7 in den Lufteintrittsschlitzen 5, 6. Erfindungsgemäss überlappen sich die beiden Teilkegelkörper 1, 2 teilweise, wobei der Überlappungswinkel δ in der Kegelspitze 0° beträgt (d.h. dort liegt keine Überlappung vor) und δ dann in Strömungsrichtung bis zum Brennerausgang, also bis zur Frontplatte 18, stetig zunimmt. Als maximaler Überlappungswinkel δ können 90° angegeben werden.If gaseous fuel 16 is burned, this happens Mixture formation with the combustion air 7 in the air inlet slots 5, 6. According to the invention, the overlap two partial cone bodies 1, 2 partially, the overlap angle δ in the cone tip is 0 ° (i.e. lies there no overlap before) and δ then in the flow direction up to to the burner outlet, i.e. up to the front plate 18, increases continuously. 90 ° can be specified as the maximum overlap angle δ become.

Wenn in der Kegelspitze bzw. im zylindrischen Anfangsteil 9, 10 der beiden Teilkegelkörper 1, 2 der Überlappungswinkel 0° beträgt, also die beiden Teilkegelkörper 1, 2 sich in diesem Bereich nicht überlappen, dann hat das den Vorteil, dass dadurch weiterhin eine hohe Axialgeschwindigkeit innerhalb des Brenners auf der Symmetrieachse erreicht wird.If in the cone tip or in the cylindrical initial part 9, 10 of the two partial cone bodies 1, 2 the overlap angle 0 ° is, that is, the two partial cone bodies 1, 2 in this Do not overlap the area, this has the advantage that it does continue to have a high axial speed within the Brenner is reached on the axis of symmetry.

Durch die überlappten Wände der Teilkegelkörper 1, 2 wird die Luftströmung 7 kanalisiert.Due to the overlapped walls of the partial cone body 1, 2 Air flow 7 channeled.

Im gleichen Masse, wie sich der Überlappungswinkel δ ändert, sind die Brennstoffinjektoren 15 weiter stromauf versetzt. Damit fallen die Lufteintrittsebene 21 und die Brennstoffinjektionsebene 22 nicht mehr zusammen. Die Brennstoffinjektionsebene 22 ändert entlang des Doppelkegelbrenners in Richtung Brennerfront ihre Position zur Lufteintrittsebene 21 dermassen, dass immer grössere Vormischstrecken von der jeweiligen Brennstoffeindüsung des gasförmigen Brennstoffes 16 bis zur Lufteintrittsebene 21 erreicht werden.To the same extent as the overlap angle δ changes, the fuel injectors 15 are further upstream. The air inlet level 21 and the fuel injection level thus fall 22 no longer together. The fuel injection level 22 changes direction along the double cone burner Burner front their position to air inlet level 21 so large that ever longer pre-mixing distances from the respective Fuel injection of the gaseous fuel 16 can be reached up to the air inlet level 21.

Dadurch wird eine homogenere Mischung des gasförmigen Brennstoffes 16 und der Verbrennungsluft 7 erzielt, was zu tieferen Flammentemperaturen und damit zu tieferen Nox-Emissionen führt. Diese tieferen Flammentemperaturen im Bereich des Brenneraustrittes reduzieren auch die thermischen Belastungen für das Material an der Brennerfront und machen eine sonst notwendige Zirkonbeschichtung des Materials hinfällig.This creates a more homogeneous mixture of the gaseous fuel 16 and the combustion air 7, which leads to deeper Flame temperatures and therefore lower NOx emissions leads. These lower flame temperatures in the range of Burner outlet also reduce the thermal loads for the material on the burner front and make one else necessary zirconium coating of the material no longer applies.

Ausserdem hat die Flamme im Vergleich zum bisher bekannten Stand der Technik, bei dem sich die Teilkegelkörper 1, 2 nicht überlappen und die Brennstoffinjektionsebene 22 der Lufteintrittsebene 21 entspricht, eine stabilere Position. Zusätzlich ergibt sich als Vorteil, dass der erfindungsgemässe Brenner auch weniger zu Pulsationen neigt. Er ist konstruktiv recht einfach gestaltet (z.B. ohne komplizierte Übergangsstücke zur Verlängerung der Vormischstrecke) und daher kostengünstig zu fertigen.In addition, the flame compared to the previously known State of the art in which the partial cone bodies 1, 2 do not overlap and the fuel injection plane 22 of the Air inlet level 21 corresponds to a more stable position. In addition, there is the advantage that the inventive Brenner also is less prone to pulsation. It is constructive designed quite simply (e.g. without complicated Transition pieces to extend the premix section) and therefore inexpensive to manufacture.

Selbstverständlich ist die Erfindung nicht auf das eben beschriebene Ausführungsbeispiel beschränkt. Die erfindungsgemässe Lösung kann ebenso auch für Brenner verwendet werden, die aus mehr als zwei Teilkegelkörpern bestehen, z.B. für sogenannte Vierschlitzbrenner. Of course, the invention is not limited to that just described Embodiment limited. The inventive Solution can also be used for burners, which consist of more than two partial cone bodies, e.g. for so-called Four slot burner.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
TeilkegelkörperPartial conical bodies
22
TeilkegelkörperPartial conical bodies
33
Mittelachse von Pos. 1Central axis of item 1
44
Mittelachse von Pos. 2Central axis of item 2
55
tangentialer Lufteintrittsschlitztangential air inlet slot
66
tangentialer Lufteintrittsschlitztangential air inlet slot
77
Verbrennungsluftcombustion air
88th
BrennerinnenraumBurner interior
99
zylindrischer Anfangsteil von Pos. 1cylindrical starting part of item 1
1010
zylindrischer Anfangsteil von Pos. 2cylindrical starting part of item 2
1111
Brennstoffdüsefuel nozzle
1212
flüssiger Brennstoffliquid fuel
1313
Brennstoffleitung für Pos. 16Fuel line for item 16
1414
Brennstoffleitung für Pos. 16Fuel line for item 16
1515
Brennstoffinjektor für Pos. 16Fuel injector for item 16
1616
gasförmiger Brennstoffgaseous fuel
1717
Brennraumcombustion chamber
1818
Frontplattefront panel
1919
Bohrungdrilling
2020
Verdünnungs- bzw. KühlluftDilution or cooling air
2121
LufteintrittsebeneAir Intake Level
2222
BrennstoffinjektionsebeneFuel injection plane
2323
FlüssigbrennstoffprofilLiquid fuel profile
2424
Rückströmzonebackflow
2525
Flammenfrontflame front
δδ
Überlappungswinkeloverlap angle

Claims (2)

  1. Burner for burning liquid (12) and gaseous fuels (16), comprising at least two hollow sectional cone bodies (1, 2) complementing one another to form one body, having tangential air-inlet slots (5, 6) which define at least one air-inlet plane (21) into the burner, and having feeds (13, 14) for gaseous (16) and liquid fuels (12), in which burner the centre axes (3, 4) of the hollow sectional cone bodies (1, 2) have a conicity widening in the direction of flow and run offset from one another in the longitudinal direction, a fuel nozzle (11) for the liquid fuel (12) being placed at the burner head in the conical inner space (8) formed by the sectional cone bodies (1, 2), and the feeds (13, 14) for the gaseous fuel being provided with fuel injectors (15) which define at least one fuel-injection plane (22), the sectional cone bodies (1, 2) overlapping at least partly, characterized in that the overlap angle (δ) increases in the direction of flow of the burner, and the distance between the fuel injectors (15) and the air-inlet plane (21) into the burner increases simultaneously with the increases in the overlap angle (δ).
  2. Burner according to Claim 1, characterized in that the overlap angle (δ) at the cone point is 0° and increases continuously downstream up to the burner front (18), the maximum overlap angle (δ) being 90°.
EP97810221A 1996-05-17 1997-04-14 Burner Expired - Lifetime EP0807787B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19619873 1996-05-17
DE19619873A DE19619873A1 (en) 1996-05-17 1996-05-17 burner

Publications (3)

Publication Number Publication Date
EP0807787A2 EP0807787A2 (en) 1997-11-19
EP0807787A3 EP0807787A3 (en) 1999-03-24
EP0807787B1 true EP0807787B1 (en) 2003-05-28

Family

ID=7794546

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Application Number Title Priority Date Filing Date
EP97810221A Expired - Lifetime EP0807787B1 (en) 1996-05-17 1997-04-14 Burner

Country Status (5)

Country Link
US (1) US5921766A (en)
EP (1) EP0807787B1 (en)
JP (1) JP3863631B2 (en)
CN (1) CN1117243C (en)
DE (2) DE19619873A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE244380T1 (en) * 1997-11-21 2003-07-15 Alstom BURNER FOR OPERATION OF A HEAT GENERATOR
US6141954A (en) * 1998-05-18 2000-11-07 United Technologies Corporation Premixing fuel injector with improved flame disgorgement capacity
EP1262714A1 (en) * 2001-06-01 2002-12-04 ALSTOM (Switzerland) Ltd Burner with exhausts recirculation
DE10333671A1 (en) 2003-07-24 2005-08-04 Alstom Technology Ltd Method for reducing the NOx emissions of a burner assembly comprising several burners and burner arrangement for carrying out the method
US7097448B2 (en) * 2004-05-07 2006-08-29 Peter Chesney Vortex type gas lamp
CA2786597A1 (en) 2010-01-06 2011-07-14 The Outdoor Greatroom Company LLLP Fire container assembly
US10281140B2 (en) 2014-07-15 2019-05-07 Chevron U.S.A. Inc. Low NOx combustion method and apparatus
US11852319B2 (en) * 2021-02-26 2023-12-26 Armando Parra Control means for vortex flame device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3570471A (en) * 1969-02-14 1971-03-16 Thermo Electron Corp Radiant tube having uniform high-temperature distribution
DE3662462D1 (en) * 1985-07-30 1989-04-20 Bbc Brown Boveri & Cie Dual combustor
CH674561A5 (en) * 1987-12-21 1990-06-15 Bbc Brown Boveri & Cie
EP0481111B1 (en) * 1990-10-17 1995-06-28 Asea Brown Boveri Ag Gas-turbine combustion chamber
DE59104727D1 (en) * 1991-12-23 1995-03-30 Asea Brown Boveri Device for mixing two gaseous components and burner in which this device is used.
US5307634A (en) * 1992-02-26 1994-05-03 United Technologies Corporation Premix gas nozzle
DE4304213A1 (en) * 1993-02-12 1994-08-18 Abb Research Ltd Burner for operating an internal combustion engine, a combustion chamber of a gas turbine group or a combustion system
DE4330083A1 (en) * 1993-09-06 1995-03-09 Abb Research Ltd Method of operating a premix burner
US5461865A (en) * 1994-02-24 1995-10-31 United Technologies Corporation Tangential entry fuel nozzle
DE19502796B4 (en) * 1995-01-30 2004-10-28 Alstom burner

Also Published As

Publication number Publication date
CN1117243C (en) 2003-08-06
DE59710156D1 (en) 2003-07-03
US5921766A (en) 1999-07-13
DE19619873A1 (en) 1997-11-20
CN1172227A (en) 1998-02-04
JP3863631B2 (en) 2006-12-27
JPH1068511A (en) 1998-03-10
EP0807787A2 (en) 1997-11-19
EP0807787A3 (en) 1999-03-24

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