EP0386732A2 - Combustion apparatus for dual fuel burner - Google Patents

Combustion apparatus for dual fuel burner Download PDF

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Publication number
EP0386732A2
EP0386732A2 EP90104351A EP90104351A EP0386732A2 EP 0386732 A2 EP0386732 A2 EP 0386732A2 EP 90104351 A EP90104351 A EP 90104351A EP 90104351 A EP90104351 A EP 90104351A EP 0386732 A2 EP0386732 A2 EP 0386732A2
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EP
European Patent Office
Prior art keywords
nozzles
nozzle plate
nozzle
gas
tube
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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
EP90104351A
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German (de)
French (fr)
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EP0386732B1 (en
EP0386732A3 (en
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Oertli Warmetechnik AG
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Oertli Warmetechnik AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • F23D17/002—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or liquid fuel

Definitions

  • the present invention relates to a combustion device for a dual-fuel burner, which device comprises a supply duct for compressed combustion air, a nozzle plate with nozzles for dividing the combustion air flow into a plurality of partial air flows, a centrally arranged fuel supply device for liquid and / or gaseous fuels, the fuel supply device having an oil supply lance has an atomizer nozzle attached to the end face thereof and a gas feed lance arranged coaxially to the oil feed lance with a gas guide chamber arranged on the front, and having a flame tube arranged at a distance in front of the nozzle plate.
  • Burners for liquid and / or gaseous fuels with a central fuel supply and an annular space for supplying the combustion air are known.
  • the invention is based on the object of developing the known burners in such a way that good flame stability is ensured during their operation and the NO x content in the flue gas is considerably reduced.
  • the advantages of the present invention are essentially to be seen in the fact that the device does not have any fixed installations for holding the flame and the flame root lies clearly within the flame tube and that the pressure loss can be kept low without these fittings and therefore the amount of flue gas recirculation increases. As a result, the O2 partial pressure in the flue gas / air mixture is reduced, which results in a lower flame temperature and little NO X in the flue gas.
  • a pipe is arranged at a distance in front of the nozzle plate, so that a second opening for the flue gas recirculation is formed.
  • the tube encloses the second nozzles of the inner tube ring and the gas routing chamber and protrudes beyond the mouths of the second nozzle and the front of the gas guide chamber and into the flame tube.
  • the main advantages of this are that the flame can be stabilized during the start phase, that contamination caused by oil residues in the vacuum area of the flame tube can be prevented and that separate partial streams formed from recirculated flue gas and combustion air can be generated.
  • FIG. 1 shows only part of a preferred embodiment of a combustion device which is designed as an assembly and is mounted in a boiler 1.
  • the combustion device has a tubular feed channel 2 for pressurized combustion air, a nozzle plate 3, which closes off the feed channel 2, a fuel feed device 4, which is arranged centrally through the feed channel 2 and is led out of the nozzle plate 3 and in Flame tube 5, which is arranged at a distance in front of the nozzle plate 3, so that a first opening 6 is formed for the flue gas recirculation.
  • a pipe 7 is provided downstream of the nozzle plate 3, which is arranged at a distance in front of the nozzle plate 3, so that a second opening 8 is formed for the flue gas recirculation.
  • the nozzle plate 3 is provided with first and second nozzles 9, 10, which are arranged in an outer and inner nozzle ring 11, 12 (FIG. 2).
  • the nozzles 9, 10 are tubular. They have different clear widths and can be of different lengths.
  • first and second nozzles 9, 10 advantageously have a certain length / diameter ratio, e.g. in the range from 3: 1 to 5: 1.
  • the nozzles 9 of the outer nozzle ring 11 are arranged inclined outwards with respect to the axis of the feed channel 2, while the nozzles 10 of the inner nozzle ring 12 are arranged parallel to the axis of the feed channel 2.
  • the centrally arranged fuel supply device 4 contains an oil supply lance 14 known per se with an atomizing nozzle 15 and a gas supply lance 16 which is designed as a double jacket tube and has a gas guide chamber 17 on the front.
  • the oil supply lance 14 is arranged within the gas supply lance 16 such that the mouth of the atomizing nozzle 15 is approximately flush with the end face of the gas guide chamber 17.
  • the gas guide chamber 17 is cylindrical and has a plurality of gas outlet holes 18 which are formed lying on a circular line in the outer jacket.
  • the assignment of the first and second nozzles 9, 10 to one another and the gas outlet holes 18 to the nozzles represents an essential condition for the function of the device.
  • the second nozzles 10 of the inner nozzle ring 11 is arranged in a gap with respect to the first nozzles 9 of the outer nozzle ring 11 and the gas outlet holes 18 are in turn arranged in a gap with respect to the second nozzles 10 of the inner nozzle ring 12.
  • the gas discharge holes 18 are arranged at a distance from the front surface of the nozzle plate 3 so that the mouth thereof is set back with respect to the plane determined by the mouths of the second nozzles 10.
  • the gas outlet holes 18 are set back by the dimension of their diameter. It is pointed out that the total outlet holes 18 can also be arranged offset with respect to the plane mentioned.
  • the tube 7 is designed such that it surrounds the second nozzles 10 and the gas guide chamber 17 and protrudes beyond the mouths of the second nozzles 10 and the end face of the gas guide chamber 17 into the flame tube 5.
  • the recirculating flue gas is divided into two flue gas streams and the combustion air into two air streams through the tube 7, so that two separate streams of a mixture of flue gas and combustion air flow into the flame tube 5.
  • the mixture flowing out of the tube 7 contains the gas.
  • the flame tube 5 and the tube 7 are adjustably mounted with respect to the nozzle plate 3. Holders, not shown, are provided for this purpose. Using this holder, the recirculated flue gas amount for the flame tube 5 and the tube 7 can be set so that different amounts of gas flow into the opening 6 or 8, as shown for example by the arrows I and II in FIG.
  • the openings 6 and 8 can also be adapted to the type of fuel. In the exemplary embodiment described, it is advantageous if opening 6 is reduced to 60-80% of the cross section for oil operation for gas operation.
  • the nozzles can also be designed as in Figures 3 and 4, i.e. have a conical shape with an enlarged or narrowed mouth opening.
  • the first and second nozzles 9, 10 can also have a corrugated outer surface, as shown in FIGS. 5 and 6.
  • FIGS. 5 and 6 show embodiments of the flame tube, the shapes of which, as already mentioned, can also be used with the nozzles 9 and 10.

Abstract

The apparatus has an air supply duct (2) which is closed off by a nozzle plate (3) with first and second nozzles (9, 10), a fuel supply apparatus (4) which is guided through the supply duct (3), a flame pipe (5) which is arranged at a distance in front of the nozzle plate (3) so that a flue gas recirculation opening (6) is formed, the cross- section of which is adjustable, and a pipe (7) which is arranged at a distance in front of the nozzle plate (3) and surrounds the second nozzles (10) of the inner nozzle ring (12) and the mouth region of the fuel supply apparatus (4). By means of this arrangement, separate part flows, consisting of recirculated flue gas and combustion air, flow into the flame pipe (5), as a result of which flame stabilisation is brought about. Structures for flame retention can thus be omitted. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Ver­brennungseinrichtung für einen Zweistoffbrenner, welche Einrichtung einen Zuführkanal für komprimierte Verbren­nungsluft, eine Düsenplatte mit Düsen zur Aufteilung des Verbrennungsluftstromes in eine Mehrzahl von Teilluft­strömen, eine zentral angeordnete Brennstoffzuführein­richtung für flüssige und/oder gasförmige Brennstoffe, wobei die Brennstoffzuführeinrichtung eine Oelzuführungs­lanze mit einer stirnseitig daran befestigten Zerstäuber­düse und eine koaxial zur Oelzuführungslanze angeordnete Gaszuführungslanze mit einer frontseitig angeordneten Gas­führungskammer hat, und eine im Abstand vor der Düsen­platte angeordnetes Flammrohr aufweist.The present invention relates to a combustion device for a dual-fuel burner, which device comprises a supply duct for compressed combustion air, a nozzle plate with nozzles for dividing the combustion air flow into a plurality of partial air flows, a centrally arranged fuel supply device for liquid and / or gaseous fuels, the fuel supply device having an oil supply lance has an atomizer nozzle attached to the end face thereof and a gas feed lance arranged coaxially to the oil feed lance with a gas guide chamber arranged on the front, and having a flame tube arranged at a distance in front of the nozzle plate.

Brenner für flüssige und/oder gasförmige Brenn­stoffe, mit einer zentralen Brennstoffzufuhr und einen Ringraum zum Zuführen der Verbrennungsluft sind bekannt.Burners for liquid and / or gaseous fuels with a central fuel supply and an annular space for supplying the combustion air are known.

Der Erfindung liegt die Aufgabe zugrunde die be­kannten Brenner so weiterzubilden, dass bei dessen Be­trieb eine gute Flammenstabilität gewährleistet ist und der NOX-Gehalt im Rauchgas erheblich verringert wird.The invention is based on the object of developing the known burners in such a way that good flame stability is ensured during their operation and the NO x content in the flue gas is considerably reduced.

Diese Aufgabe wird erfindungsgemäss mit den kenn­zeichnenden Merkmalen des Anspruches 1 gelöst.This object is achieved according to the invention with the characterizing features of claim 1.

Die Vorteile der vorliegenden Erfindung sind im wesentlichen darin zu sehen, dass die Einrichtung ohne feste Einbauten zur Flammenhalterung auskommt und die Flammwurzel eindeutig innerhalb des Flammrohres liegt und dass ohne diese Einbauten der Druckverlust niedrig ge­halten werden kann und deshalb die Rauchgasrezirkulations­menge grösser wird. In der Folge wird dadurch der O₂-Par­tialdruck im Rauchgas/Luftgemisch herabgesetzt, was eine niedrigere Flammentemperatur und wenig NOX im Rauchgas zur Folge hat.The advantages of the present invention are essentially to be seen in the fact that the device does not have any fixed installations for holding the flame and the flame root lies clearly within the flame tube and that the pressure loss can be kept low without these fittings and therefore the amount of flue gas recirculation increases. As a result, the O₂ partial pressure in the flue gas / air mixture is reduced, which results in a lower flame temperature and little NO X in the flue gas.

Bei einer Ausführungsform der Erfindung ist ein Rohr im Abstand vor der Düsenplatte angeordnet, so dass eine zweite Oeffnung für die Rauchgasrezirkulation ge­bildet wird. Das Rohr umschliesst die zweiten Düsen des inneren Rohrkranzes und die Gasführungskammer
und ragt über die Mündungen der zweiten Düsen und die Stirnseite der Gasführungskammer hinaus und in das Flammrohr hinein.In one embodiment of the invention, a pipe is arranged at a distance in front of the nozzle plate, so that a second opening for the flue gas recirculation is formed. The tube encloses the second nozzles of the inner tube ring and the gas routing chamber
and protrudes beyond the mouths of the second nozzle and the front of the gas guide chamber and into the flame tube.

Die sich daraus ergebenden Vorteile sind zur Hauptsache darin zu sehen, dass die Flamme während der Startphase stabilisiert werden kann, dass eine durch Oel­rückstände im Unterdruckbereich des Flammrohres verur­sachte Verschmutzung verhindert werden kann und dass separate aus rezirkuliertem Rauchgas und Verbrennungsluft gebildete Teilströme erzeugt werden können.The main advantages of this are that the flame can be stabilized during the start phase, that contamination caused by oil residues in the vacuum area of the flame tube can be prevented and that separate partial streams formed from recirculated flue gas and combustion air can be generated.

Weitere Ausführungsformen der Erfindung ergeben sich aus den abhängigen Patentansprüchen.Further embodiments of the invention result from the dependent patent claims.

Im folgenden wird die Erfindung anhand der bei­liegenden Zeichnungen näher erläutert.The invention is explained in more detail below with reference to the accompanying drawings.

Es zeigen:

  • Figur 1 einen schematisch dargestellten Schnitt eines Teils eines Ausführungsbeispiels einer erfindungs­gemässen Verbrennungseinrichtung,
  • Figur 2 eine Ansicht in Richtung des Pfeiles "A" in Figur 1,
  • Figur 3 einen Schnitt durch eine andere Ausfüh­rungsform einer Verbrennungsluftdüse,
  • Figur 4 einen Schnitt durch eine weitere Ausfüh­rungsform einer Verbrennungsluftdüse,
  • Figur 5 einen Querschnitt einer anderen Ausfüh­rungsform des Flammrohres, und
  • Figur 6 einen Querschnitt einer weiteren Ausfüh­ rungsform des Flammrohres.
Show it:
  • FIG. 1 shows a schematically illustrated section of part of an exemplary embodiment of a combustion device according to the invention,
  • FIG. 2 shows a view in the direction of arrow "A" in FIG. 1,
  • FIG. 3 shows a section through another embodiment of a combustion air nozzle,
  • FIG. 4 shows a section through a further embodiment of a combustion air nozzle,
  • Figure 5 shows a cross section of another embodiment of the flame tube, and
  • Figure 6 shows a cross section of a further embodiment shape of the flame tube.

Die Figur 1 zeigt nur einen Teil einer bevorzug­ten Ausführungsform einer Verbrennungseinrichtung, die als Baugruppe ausgebildet ist und in einem Kessel 1 mon­tiert ist.FIG. 1 shows only part of a preferred embodiment of a combustion device which is designed as an assembly and is mounted in a boiler 1.

Wie die Figur 1 zeigt, hat die Verbrennungsein­richtung einen rohrförmigen Zuführkanal 2 für unter Druck stehende Verbrennungsluft, eine Düsenplatte 3, die den Zuführkanal 2 abschliesst, eine Brennstoffzuführeinrichtung 4, die zentral angeordnet durch den Zuführkanal 2 geführt und aus der Düsenplatte 3 herausgeführt ist und ein Flamm­rohr 5, das im Abstand vor der Düsenplatte 3 angeordnet ist, so dass eine erste Oeffnung 6 für die Rauchgasrezir­kulation gebildet wird.As FIG. 1 shows, the combustion device has a tubular feed channel 2 for pressurized combustion air, a nozzle plate 3, which closes off the feed channel 2, a fuel feed device 4, which is arranged centrally through the feed channel 2 and is led out of the nozzle plate 3 and in Flame tube 5, which is arranged at a distance in front of the nozzle plate 3, so that a first opening 6 is formed for the flue gas recirculation.

Ferner ist stromab der Düsenplatte 3 ein Rohr 7 vorgesehen, das im Abstand vor der Düsenplatte 3 angeord­net ist, so dass eine zweite Oeffnung 8 für die Rauchgas­rezirkulation gebildet wird.Furthermore, a pipe 7 is provided downstream of the nozzle plate 3, which is arranged at a distance in front of the nozzle plate 3, so that a second opening 8 is formed for the flue gas recirculation.

Die Düsenplatte 3 ist mit ersten und zweiten Dü­sen 9,10 versehen, die in einem äusseren und inneren Dü­senkranz 11,12 angeordnet sind (Figur 2). Die Düsen 9,10 sind rohrförmig ausgebildet. Sie haben unterschiedliche lichte Weite und können unterschiedlich lang sein.The nozzle plate 3 is provided with first and second nozzles 9, 10, which are arranged in an outer and inner nozzle ring 11, 12 (FIG. 2). The nozzles 9, 10 are tubular. They have different clear widths and can be of different lengths.

Es wird darauf hingewiesen, dass die ersten und zweiten Düsen 9,10 mit Vorteil ein bestimmtes Länge/durch­messerverhältnis haben, z.B. im Bereich von 3:1 bis 5:1. Die Düsen 9 des äusseren Düsenkranzes 11 sind bezüglich der Achse des Zuführkanals 2 nach aussen geneigt angeord­net, während die Düsen 10 des inneren Düsenkranzes 12 pa­rallel zur Achse des Zuführkanals 2 angeordnet sind.It should be noted that the first and second nozzles 9, 10 advantageously have a certain length / diameter ratio, e.g. in the range from 3: 1 to 5: 1. The nozzles 9 of the outer nozzle ring 11 are arranged inclined outwards with respect to the axis of the feed channel 2, while the nozzles 10 of the inner nozzle ring 12 are arranged parallel to the axis of the feed channel 2.

Die zentral angeordnete Brennstoffzuführungsein­richtung 4 enthält eine an sich bekannte Oelzuführungs­lanze 14 mit einer Zerstäüberdüse 15 und eine Gaszufüh­rungslanze 16, die als Doppelmantelrohr ausgebildet ist und frontseitig eine Gasführungskammer 17 hat. Die Oel­zuführungslanze 14 ist innerhalb der Gaszuführungslanze 16 so angeordnet, dass die Mündung der Zerstäuberdüse 15 etwa bündig mit der Stirnseite der Gasführungskammer 17 ist.The centrally arranged fuel supply device 4 contains an oil supply lance 14 known per se with an atomizing nozzle 15 and a gas supply lance 16 which is designed as a double jacket tube and has a gas guide chamber 17 on the front. The oil supply lance 14 is arranged within the gas supply lance 16 such that the mouth of the atomizing nozzle 15 is approximately flush with the end face of the gas guide chamber 17.

Die Gasführungskammer 17 ist zylinderförmig und weist eine Mehrzahl von Gasaustrittslöchern 18 auf, die auf einer Kreislinie liegend im äusseren Mantel ausgebil­det sind.The gas guide chamber 17 is cylindrical and has a plurality of gas outlet holes 18 which are formed lying on a circular line in the outer jacket.

Bei der hier in Rede stehenden Erfindung stellt die Zuordnung der ersten und zweiten Düsen 9,10 unterein­ander sowie der Gasaustrittslöcher 18 zu den Düsen eine wesentliche Bedingung für die Funktion der Einrichtung dar. Wie insbesondere aus Figur 2 ersichtlich ist, sind die zweiten Düsen 10 des inneren Düsenkranzes 11 auf Lücke bezüglich den ersten Düsen 9 des äusseren Düsenkranzes 11 angeordnet und die Gasaustrittslöcher 18 sind ihrerseits auf Lücke bezüglich den zweiten Düsen 10 des inneren Düsen­kranzes 12 angeordnet. Andererseits sind die Gasaustritts­löcher 18 in einem Abstand von der Frontfläche der Düsen­platte 3 so angeordnet, dass deren Mündung bezüglich der Ebene zurückversetzt sind, die durch die Mündungen der zweiten Düsen 10 bestimmt wird. Beim erfindungsgemässen Ausführungsbeispiel sind die Gasaustrittslöcher 18 um das Mass ihres Durchmessers zurückversetzt. Es wird darauf hingewiesen, dass die Gesamtaustrittslöcher 18 bezüglich der genannten Ebene auch vorversetzt angeordnet sein kön­nen.In the case of the invention in question, the assignment of the first and second nozzles 9, 10 to one another and the gas outlet holes 18 to the nozzles represents an essential condition for the function of the device. As can be seen in particular from FIG. 2, the second nozzles 10 of the inner nozzle ring 11 is arranged in a gap with respect to the first nozzles 9 of the outer nozzle ring 11 and the gas outlet holes 18 are in turn arranged in a gap with respect to the second nozzles 10 of the inner nozzle ring 12. On the other hand, the gas discharge holes 18 are arranged at a distance from the front surface of the nozzle plate 3 so that the mouth thereof is set back with respect to the plane determined by the mouths of the second nozzles 10. In the exemplary embodiment according to the invention, the gas outlet holes 18 are set back by the dimension of their diameter. It is pointed out that the total outlet holes 18 can also be arranged offset with respect to the plane mentioned.

Beim vorliegenden Ausführungsbeispiel ist das Rohr 7 so ausgebildet, dass es die zweiten Düsen 10 und die Gasführungskammer 17 umschliesst und über die Mün­dungen der zweiten Düsen 10 und die Stirnseite der Gas­führungskammer 17 hinaus in das Flammrohr 5 hineinragt.In the present exemplary embodiment, the tube 7 is designed such that it surrounds the second nozzles 10 and the gas guide chamber 17 and protrudes beyond the mouths of the second nozzles 10 and the end face of the gas guide chamber 17 into the flame tube 5.

Wie insbesondere Figur 1 zeigt, werden durch das Rohr 7 das rezirkulierende Rauchgas in zwei Rauchgasströ­me und die Verbrennungsluft in zwei Luftströme unterteilt, so dass zwei voneinander getrennte Ströme eines Gemisches aus Rauchgas und Verbrennungsluft in das Flammrohr 5 ein­strömen. Bei einem Gasbrenner enthält das aus dem Rohr 7 ausströmende Gemisch das Gas. Das Flammrohr 5 und das Rohr 7 sind bezüglich der Düsenplatte 3 verstellbar mon­tiert. Hierzu sind nicht dargestellte Halter vorgesehen. Mittels dieser Halter kann die rezirkulierte Rauchgas­ menge für ds Flammrohr 5 und das Rohr 7 eingestellt wer­den, so dass unterschiedliche Gasmengen in die Oeffnung 6 bzw. 8 einströmen, wie dies beispielsweise durch die Pfeile I und II in Figur 1 dargestellt ist. Ausserdem kann man die Oeffnungen 6 bzw. 8 auch an die Brennstoffart an­passen. Beim beschriebenen Ausführungsbeispiel ist es von Vorteil, wenn man für den Gasbetrieb die Oeffnung 6 auf 60-80% des Querschnittes für Oelbetrieb verringert.As shown in particular in FIG. 1, the recirculating flue gas is divided into two flue gas streams and the combustion air into two air streams through the tube 7, so that two separate streams of a mixture of flue gas and combustion air flow into the flame tube 5. In the case of a gas burner, the mixture flowing out of the tube 7 contains the gas. The flame tube 5 and the tube 7 are adjustably mounted with respect to the nozzle plate 3. Holders, not shown, are provided for this purpose. Using this holder, the recirculated flue gas amount for the flame tube 5 and the tube 7 can be set so that different amounts of gas flow into the opening 6 or 8, as shown for example by the arrows I and II in FIG. In addition, the openings 6 and 8 can also be adapted to the type of fuel. In the exemplary embodiment described, it is advantageous if opening 6 is reduced to 60-80% of the cross section for oil operation for gas operation.

Neben der vorstehend beschriebenen Form können die Düsen auch wie in den Figuren 3 und 4 ausgebildet sein, d.h. eine konische Form mit einer erweiterten oder verengten Mündungsöffnung haben. Die ersten und zweiten Düsen 9,10 können neben der glatten Mantelfläche auch eine gewellte Mantelfläche aufweisen, wie dies in den Figuren 5 und 6 dargestellt ist.In addition to the shape described above, the nozzles can also be designed as in Figures 3 and 4, i.e. have a conical shape with an enlarged or narrowed mouth opening. In addition to the smooth outer surface, the first and second nozzles 9, 10 can also have a corrugated outer surface, as shown in FIGS. 5 and 6.

Die Figuren 5 und 6 zeigen Ausführungsformen des Flammrohres, deren Formen wie bereits erwähnt auch bei den Düsen 9 und 10 anwendbar ist.FIGS. 5 and 6 show embodiments of the flame tube, the shapes of which, as already mentioned, can also be used with the nozzles 9 and 10.

Claims (14)

1. Verbrennungseinrichtung für gasförmige und/­oder flüssige Brennstoffe, welche Einrichtung einen Zu­führkanal für komprimierte Verbrennungsluft, eine Düsen­platte zur Aufteilung des Verbrennungsluftstromes in eine Mehrzahl von Teilluftströmen, eine zentral angeordnete Brennstoffzuführeinrichtung eine Oelzuführungslanze mit einer stirnseitig daran befestigten Zerstäuberdüse und/­oder eine koaxial zur Oelzuführungslanze angeordnete Gas­zuführungslanze mit einer frontseitig angeordneten und Gasaustrittsöffnungen aufweisenden Gasführungskammer hat, und ein Flammrohr aufweist, das im Abstand von der Düsen­platte angeordnet ist, so dass eine Oeffnung für die Rauchgasrezirkulation gebildet wird, dadurch gekennzeich­net, dass erste und zweite Düsen 9,10 in einem äusseren und inneren Düsenkranz (11,12) hervorstehend an der Dü­senplatte (3) so angeordnet sind, dass die zweiten Düsen (10) des inneren Düsenkranzes auf Lücke zu den ersten Düsen (9) des äusseren Düsenkranzes liegen, dass die er­sten und zweiten Düsen (9,10) des äusseren und inneren Düsenkranzes (11,12) unterschiedliche Innendurchmesser haben und dass die Brennstoffzuführungseinrichtung (4) zentrisch in der Düsenplatte (3) angeordnet ist, derart, dass das ausgebrachte Brennstoffmedium in den Bereich des Aussströmkegels der ersten und zweiten Düsen (9,10) ein­geführt wird.1. Combustion device for gaseous and / or liquid fuels, which device has a supply channel for compressed combustion air, a nozzle plate for dividing the combustion air flow into a plurality of partial air flows, a centrally arranged fuel supply device, an oil supply lance with an atomizer nozzle attached to the end face and / or a coaxial to the oil supply lance arranged gas supply lance with a gas guide chamber arranged at the front and having gas outlet openings, and has a flame tube which is arranged at a distance from the nozzle plate, so that an opening for the flue gas recirculation is formed, characterized in that first and second nozzles 9, 10 in an exterior and the inner nozzle ring (11, 12) projecting on the nozzle plate (3) so that the second nozzles (10) of the inner nozzle ring are in gap with the first nozzles (9) of the outer D. are located that the first and second nozzles (9, 10) of the outer and inner nozzle rings (11, 12) have different inner diameters and that the fuel supply device (4) is arranged centrally in the nozzle plate (3), such that the fuel medium applied is introduced into the area of the outflow cone of the first and second nozzles (9, 10). 2. Einrichtung nach Anspruch 1, dadurch gekenn­zeichnet, dass ein Rohr (7) im Abstand vor der Düsenplat­te (3) angeordnet ist, so dass eine zweite Oeffnung (8) für die Rauchgasrezirkulation gebildet wird und dass das Rohr (7) die zweiten Düsen (10) des inneren Düsen­kranzes (12) und die Gasführungskammer (17) umschliesst und die Mündungen der zweiten Düsen (10) und die Stirnseite der Gasführungskammer (17) überragt, so dass zwei aus rezirkuliertem Rauchgas und Verbrennungsluft bestehende Teilströme erzeugt werden.2. Device according to claim 1, characterized in that a tube (7) is arranged at a distance in front of the nozzle plate (3), so that a second opening (8) for the flue gas recirculation is formed and that the tube (7) the second nozzle (10) of the inner nozzle ring (12) and the gas guide chamber (17) and the mouths of the second nozzles (10) and the face of the gas guide chamber (17) protrudes, so that two partial streams consisting of recirculated flue gas and combustion air are generated. 3. Einrichtung nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass die ersten Düsen (9) einen grösseren Innendurchmesser haben als die zweiten Düsen (10).3. Device according to one of claims 1 and 2, characterized in that the first nozzles (9) have a larger inner diameter than the second nozzles (10). 4. Einrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die ersten Düsen (9) geneigt in der Düsenplatte (3) angeordnet sind.4. Device according to one of claims 1 to 3, characterized in that the first nozzles (9) are arranged inclined in the nozzle plate (3). 5. Einrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Mündung der ersten Dü­sen (9) und die Mündungen der zweiten Düsen (10) bezüglich der Düsenplatte (3) den gleichen oder unterschiedlichen Abstand haben.5. Device according to one of claims 1 to 4, characterized in that the mouth of the first nozzles (9) and the mouths of the second nozzles (10) with respect to the nozzle plate (3) have the same or different distance. 6. Einrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die ersten Düsen (9) und/­oder die zweiten Düsen (10) mit Mitteln versehen sind, um der einströmenden Verbrennungsluft einen Drall zu erteilen.6. Device according to one of claims 1 to 5, characterized in that the first nozzles (9) and / or the second nozzles (10) are provided with means to impart a swirl to the incoming combustion air. 7. Einrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Düsen (9,10) konisch mit einer erweiterten oder verengten Mündungsöffnung ausge­bildet sind.7. Device according to one of claims 1 to 6, characterized in that the nozzles (9,10) are conical with an enlarged or narrowed mouth opening. 8. Einrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Brennstoffzuführeinrich­tung (4) verschiebbar bezüglich der Düsenplatte (3) an­geordnet ist.8. Device according to one of claims 1 to 7, characterized in that the fuel supply device (4) is arranged displaceably with respect to the nozzle plate (3). 9. Einrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Zerstäuberdüse (15) einen Kegelschichtwinkel β hat, der grösser ist als 90°.9. Device according to one of claims 1 to 8, characterized in that the atomizing nozzle (15) has a cone layer angle β, which is greater than 90 °. 10. Einrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Mündungen der Gasaus­trittslöcher (18) auf Lücke zu den zweiten Düsen (10) so angeordnet sind, dass die Strömungsrichtung des Gases und der Luft quer oder parallel zueinander gerichtet sind.10. Device according to one of claims 1 to 9, characterized in that the mouths of the gas outlet holes (18) on the gap to the second nozzles (10) are arranged so that the flow direction of the gas and the air are directed transversely or parallel to each other. 11. Einrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Gasführungskammer (17) zylindrisch ist und dass die Gasaustrittslöcher (18) auf Lücke zu den zweiten Düsen des inneren Düsenkranzes (12) in radialer Richtung in der Gasführungskammer (17) ausgebildet sind.11. Device according to one of claims 1 to 10, characterized in that the gas guide chamber (17) is cylindrical and that the gas outlet holes (18) in the radial direction in the gas guide chamber (17) to the second nozzles of the inner nozzle ring (12) are trained. 12. Einrichtung nach Anspruch 10, dadurch ge­ kennzeichnet, dass die Mündung des Gasaustrittsloches (18) in einem Bereich einer Ebene liegend angeordnet sind, die durch die Mündung der zweiten Düsen (10) des inneren Düsenkranzes (12) bestimmt ist.12. The device according to claim 10, characterized ge indicates that the mouth of the gas outlet hole (18) is arranged lying in a region of a plane which is determined by the mouth of the second nozzles (10) of the inner nozzle ring (12). 13. Einrichtung nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass das Flammrohr (5) und das Rohr (7) bezüglich der Düsenplatte (3) verstellbar sind, um durch Aenderung der Querschnitte der Oeffnungen (6,8) die Teilströme einzustellen.13. Device according to one of claims 1 to 12, characterized in that the flame tube (5) and the tube (7) with respect to the nozzle plate (3) are adjustable in order to adjust the partial flows by changing the cross sections of the openings (6,8) . 14. Einrichtung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass der Querschnitt der Oeffnung (6) zwischen Düsenplatte (3) und Flammrohr (5) für flüssi­ge und gasförmige Brennstoffe gleich oder unterschiedlich gross ist.14. Device according to one of claims 1 to 13, characterized in that the cross section of the opening (6) between the nozzle plate (3) and flame tube (5) for liquid and gaseous fuels is the same or different sizes.
EP90104351A 1989-03-10 1990-03-07 Combustion apparatus for dual fuel burner Expired - Lifetime EP0386732B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH904/89 1989-03-10
CH904/89A CH678100A5 (en) 1989-03-10 1989-03-10

Publications (3)

Publication Number Publication Date
EP0386732A2 true EP0386732A2 (en) 1990-09-12
EP0386732A3 EP0386732A3 (en) 1991-05-15
EP0386732B1 EP0386732B1 (en) 1994-08-31

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ID=4197885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90104351A Expired - Lifetime EP0386732B1 (en) 1989-03-10 1990-03-07 Combustion apparatus for dual fuel burner

Country Status (4)

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EP (1) EP0386732B1 (en)
AT (1) ATE110837T1 (en)
CH (1) CH678100A5 (en)
DE (1) DE59006932D1 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4113412A1 (en) * 1991-04-20 1992-10-22 Saacke Gmbh & Co Kg COMBUSTION DEVICE AND METHOD FOR OPERATING A COMBUSTION PLANT WITH INTERNAL FLUE GAS RECIRCULATION FOR NO (ARROW DOWN) X (ARROW DOWN) REDUCTION
EP0751351A1 (en) * 1995-06-26 1997-01-02 Abb Research Ltd. Combustion chamber
EP0757205A2 (en) * 1995-08-04 1997-02-05 Air Products And Chemicals, Inc. Method and apparatus for reducing NOX production during air-oxygen-fuel combustion
EP0809070A1 (en) * 1996-05-19 1997-11-26 Oertli Thermique (Société Anonyme) Burner with exhaust gas recirculation
EP0978685A1 (en) * 1998-08-07 2000-02-09 Entreprise Generale De Chauffage Industriel Pillard Improvement to burners with fluegas recirculation and low nitric oxide emissions
AT406795B (en) * 1997-12-15 2000-09-25 Schwarz A & Co Burner for gas and oil heating boilers
FR2800844A1 (en) * 1999-11-08 2001-05-11 Muller Et Cie Arrangement, for improving combustion of air pulse fuel burner used for heater, comprises sleeve having thin wall and frontal orifice of dimension slightly greater to that of nose of burner
EP1279895A1 (en) * 2001-07-25 2003-01-29 Compagnie Europeenne de Bruleurs Burner combustion head with a prevaporization zone for liquid fuel
CN105698174A (en) * 2016-04-11 2016-06-22 徐州科融环境资源股份有限公司 Low-nitrogen combustor for gas
IT201900006424A1 (en) * 2019-04-29 2020-10-29 Stefano Pesce Combustion head with internal recirculation and burner comprising the same
EP4008955A1 (en) * 2020-12-03 2022-06-08 WS-Wärmeprozesstechnik GmbH Device and method for supplying combustion air and exhaust gas recirculation for a burner
IT202100023477A1 (en) 2021-09-10 2023-03-10 Shanghai Quanjie Envir Equip Co Ltd COMBUSTION HEAD WITH INTERNAL RECIRCULATION AND BURNER INCLUDING THE SAME

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0139085A1 (en) * 1983-07-30 1985-05-02 Deutsche Babcock Werke Aktiengesellschaft Process and burner for the combustion of liquid or gaseous fuels with reduced production of NOx
WO1986007434A1 (en) * 1985-06-04 1986-12-18 Mueller Rudolf Burner for liquid fuel boiler with combustion gas recycling circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0139085A1 (en) * 1983-07-30 1985-05-02 Deutsche Babcock Werke Aktiengesellschaft Process and burner for the combustion of liquid or gaseous fuels with reduced production of NOx
WO1986007434A1 (en) * 1985-06-04 1986-12-18 Mueller Rudolf Burner for liquid fuel boiler with combustion gas recycling circuit

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4113412A1 (en) * 1991-04-20 1992-10-22 Saacke Gmbh & Co Kg COMBUSTION DEVICE AND METHOD FOR OPERATING A COMBUSTION PLANT WITH INTERNAL FLUE GAS RECIRCULATION FOR NO (ARROW DOWN) X (ARROW DOWN) REDUCTION
DE4113412C2 (en) * 1991-04-20 1999-04-01 Saacke Gmbh & Co Kg Device for burning liquid or gaseous fuel for a furnace
EP0751351A1 (en) * 1995-06-26 1997-01-02 Abb Research Ltd. Combustion chamber
EP0757205A2 (en) * 1995-08-04 1997-02-05 Air Products And Chemicals, Inc. Method and apparatus for reducing NOX production during air-oxygen-fuel combustion
EP0757205A3 (en) * 1995-08-04 1999-01-07 Air Products And Chemicals, Inc. Method and apparatus for reducing NOX production during air-oxygen-fuel combustion
EP0809070A1 (en) * 1996-05-19 1997-11-26 Oertli Thermique (Société Anonyme) Burner with exhaust gas recirculation
AT406795B (en) * 1997-12-15 2000-09-25 Schwarz A & Co Burner for gas and oil heating boilers
FR2782150A1 (en) * 1998-08-07 2000-02-11 Pillard Chauffage IMPROVEMENTS ON LOW-EMITTING AND LOW-EMITTING NITROGEN OXIDES BURNER
EP0978685A1 (en) * 1998-08-07 2000-02-09 Entreprise Generale De Chauffage Industriel Pillard Improvement to burners with fluegas recirculation and low nitric oxide emissions
FR2800844A1 (en) * 1999-11-08 2001-05-11 Muller Et Cie Arrangement, for improving combustion of air pulse fuel burner used for heater, comprises sleeve having thin wall and frontal orifice of dimension slightly greater to that of nose of burner
EP1279895A1 (en) * 2001-07-25 2003-01-29 Compagnie Europeenne de Bruleurs Burner combustion head with a prevaporization zone for liquid fuel
CN105698174A (en) * 2016-04-11 2016-06-22 徐州科融环境资源股份有限公司 Low-nitrogen combustor for gas
CN105698174B (en) * 2016-04-11 2018-07-17 徐州科融环境资源股份有限公司 A kind of combustion gas low NO
IT201900006424A1 (en) * 2019-04-29 2020-10-29 Stefano Pesce Combustion head with internal recirculation and burner comprising the same
EP3734154A1 (en) * 2019-04-29 2020-11-04 Shanghai Quanjie Envir Co,. Ltd. A combustion head with internal recirculation
EP4008955A1 (en) * 2020-12-03 2022-06-08 WS-Wärmeprozesstechnik GmbH Device and method for supplying combustion air and exhaust gas recirculation for a burner
WO2022117345A1 (en) * 2020-12-03 2022-06-09 WS - Wärmeprozesstechnik GmbH Device and method for supplying combustion air and for recirculating exhaust gas for a burner
IT202100023477A1 (en) 2021-09-10 2023-03-10 Shanghai Quanjie Envir Equip Co Ltd COMBUSTION HEAD WITH INTERNAL RECIRCULATION AND BURNER INCLUDING THE SAME

Also Published As

Publication number Publication date
DE59006932D1 (en) 1994-10-06
EP0386732B1 (en) 1994-08-31
ATE110837T1 (en) 1994-09-15
EP0386732A3 (en) 1991-05-15
CH678100A5 (en) 1991-07-31

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