EP0386732B1 - Combustion apparatus for dual fuel burner - Google Patents

Combustion apparatus for dual fuel burner Download PDF

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Publication number
EP0386732B1
EP0386732B1 EP90104351A EP90104351A EP0386732B1 EP 0386732 B1 EP0386732 B1 EP 0386732B1 EP 90104351 A EP90104351 A EP 90104351A EP 90104351 A EP90104351 A EP 90104351A EP 0386732 B1 EP0386732 B1 EP 0386732B1
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EP
European Patent Office
Prior art keywords
nozzles
gas
nozzle plate
nozzle
tube
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EP90104351A
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German (de)
French (fr)
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EP0386732A3 (en
EP0386732A2 (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 invention relates to a combustion device according to the preamble of claim 1.
  • a combustion device according to the preamble of claim 1.
  • Such a device thus serves for a two-fuel burner, i.e. it can run on two different fuels, either a gas or a liquid fuel.
  • Such a device according to the preamble of claim 1 is known from EP-A-0 139 085.
  • the entire combustion air flows through a guide tube which connects to an air guide tube.
  • the fuel gas or liquid
  • the combustible mixture then enters a flame tube.
  • the invention is based on the object of developing this known device in such a way that good flame stability is ensured during its operation and the NO x content in the flue gas is considerably reduced.
  • the combustion air is now divided into a plurality of partial air streams on a nozzle plate and, furthermore, the guide tube no longer connects to the air guide tube, but stands at a distance from it.
  • a number of the partial air flows will now be in the Guide tube directed and the rest of the partial air flows into the flame tube, so that two radially lying flue gas flows result in their circulation.
  • the advantages of the present invention can be seen essentially in the fact that the device does not have any fixed installations for holding the flame and that the flame root is clearly within the flame tube and that the pressure loss can be kept low without these installations and therefore the flue gas recirculation quantity increases.
  • 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.
  • the flame can be stabilized during the starting phase and contamination caused by oil residues in the vacuum area of the flame tube can be prevented.
  • a combustion device is known from WO-A-8 607 434 which only works with liquid fuel.
  • a guide tube that connects directly to a nozzle plate for the combustion air without any space. This direct connection of the guide tube to the nozzle plate means that no additional flue gas flow can circulate between the nozzle plate and the guide tube.
  • 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 a known oil supply lance 14 with an atomizing nozzle 15 and a gas supply lance 16, which is designed as a double-walled 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 atomizer 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 12 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 in relation to the plane mentioned.
  • the nozzles 9, 10 can also be designed as in FIGS. 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 5, 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 Erfindung betrifft eine Verbrennungseinrichtung nach dem Oberbegriff des Patentanspruchs 1. Eine solche Einrichtung dient somit für einen Zweistoffbrenner, d.h. er kann mit zwei verschiedenen Brennstoffen betrieben werden, nämlich entweder mit einem Gas oder mit einem flüssigen Brennstoff. Eine solche Einrichtung nach dem Oberbegriff des Patentanspruchs 1 ist durch die EP-A-0 139 085 bekannt.The invention relates to a combustion device according to the preamble of claim 1. Such a device thus serves for a two-fuel burner, i.e. it can run on two different fuels, either a gas or a liquid fuel. Such a device according to the preamble of claim 1 is known from EP-A-0 139 085.

Bei dieser bekannten Einrichtung strömt die gesamte Verbrennungsluft durch ein Führungsrohr, das an ein Luftleitrohr anschliesst. Innerhalb des Führungsrohres wird der Brennstoff (Gas oder Flüssigkeit) eingespritzt. Das brennbare Gemisch tritt dann in ein Flammrohr ein. Es sind dann noch weitere Führungsrohre vorhanden, so dass mit diesen und dem Flammrohr Kanäle für eine Rauchgaszirkulation gebildet werden.In this known device, the entire combustion air flows through a guide tube which connects to an air guide tube. The fuel (gas or liquid) is injected inside the guide tube. The combustible mixture then enters a flame tube. There are then further guide tubes so that channels for a flue gas circulation are formed with these and the flame tube.

Der Erfindung liegt die Aufgabe zugrunde diese bekannte Einrichtung so weiterzubilden, dass bei deren Betrieb eine gute Flammenstabilität gewährleistet ist und der NOX-Gehalt im Rauchgas erheblich verringert wird.The invention is based on the object of developing this known device in such a way that good flame stability is ensured during its 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.

Gemäss der Erfindung wird also nunmehr die Verbrennungsluft an einer Düsenplatte in eine Vielzahl von Teilluftströmen aufgeteilt und weiterhin schliesst das Führungsrohr nicht mehr am Luftleitrohr an, sondern steht im Abstand davor. Eine Anzahl der Teilluftströme wird nunmehr in das Führungsrohr geleitet und der Rest der Teilluftströme strömt in das Flammrohr, so dass sich zwei radial zueinanderliegende Rauchgasströme bei deren Zirkulation ergeben.According to the invention, the combustion air is now divided into a plurality of partial air streams on a nozzle plate and, furthermore, the guide tube no longer connects to the air guide tube, but stands at a distance from it. A number of the partial air flows will now be in the Guide tube directed and the rest of the partial air flows into the flame tube, so that two radially lying flue gas flows result in their circulation.

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. Weiterhin kann die Flamme während der Startphase stabilisiert werden und es kann eine durch Oelrückstände im Unterdruckbereich des Flammrohres verursachte Verschmutzung verhindert werden.The advantages of the present invention can be seen essentially in the fact that the device does not have any fixed installations for holding the flame and that the flame root is clearly within the flame tube and that the pressure loss can be kept low without these installations and therefore the flue gas recirculation quantity 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. Furthermore, the flame can be stabilized during the starting phase and contamination caused by oil residues in the vacuum area of the flame tube can be prevented.

Durch die WO-A-8 607 434 ist eine Verbrennungseinrichtung bekannt, die nur mit flüssigem Brennstoff arbeitet. Auch hier ist ein Führungsrohr vorhanden, das ohne Zwischenraum, also direkt an eine Düsenplatte für die Verbrennungsluft anschliesst. Durch diesen direkten Anschluss des Führungsrohres an die Düsenplatte kann zwischen Düsenplatte und Führungsrohr kein zusätzlicher Rauchgasstrom zirkulieren.A combustion device is known from WO-A-8 607 434 which only works with liquid fuel. Here too, there is a guide tube that connects directly to a nozzle plate for the combustion air without any space. This direct connection of the guide tube to the nozzle plate means that no additional flue gas flow can circulate between the nozzle plate and the guide tube.

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 Ausführungsform 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 the flame tube, and
  • Figure 6 shows a cross section of a further embodiment 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 Verhältnis von Länge/Durchmesser 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 Zerstäuberdüse 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 a known oil supply lance 14 with an atomizing nozzle 15 and a gas supply lance 16, which is designed as a double-walled 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 atomizer 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 12 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 12 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 in relation 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 projects into the flame tube 5 beyond the mouths of the second nozzles 10 and the end face of the gas guide chamber 17.

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 Rauchgasmenge für das 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 FIG. 1 in particular, 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 can can be set for the flame tube 5 and the tube 7, 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 9,10 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 9, 10 can also be designed as in FIGS. 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 5, deren Formen wie bereits erwähnt, auch bei den Düsen 9 und 10 anwendbar ist.FIGS. 5 and 6 show embodiments of the flame tube 5, the shapes of which, as already mentioned, can also be used with the nozzles 9 and 10.

Claims (12)

  1. Combustion apparatus for gaseous and liquid fuels, which apparatus includes a feed channel (2) for pressurized combustion air, a centrally located oil feed lance (14) with a front end atomizing nozzle (15) and a gas feed lance (16) with gas exit openings (18) located coaxial to the oil feed lance (14) and a fire tube (5), as well, characterized in that a nozzle plate (3) for a splitting of the combustion air flow into a plurality of partial air flows (9, 10) is present, that the fire tube (5) is located at a distance from the nozzle plate (3) such that an opening (6) for a circulation of flue gas is formed, that first and second nozzles (9, 10) are arranged in an outer and inner nozzle ring (11, 12) projecting at the nozzle plate (3) in such a manner that the second nozzles (10) of the inner nozzle ring (12) are arranged at interstices relative to the first nozzles (9) of the outer nozzle ring (11), that the first and second nozzles (9, 10) of the outer and inner nozzle rings (11, 12) have different inner diameters and that the oil feed lance (14) and also the gas feed lance (16) are arranged centrally in the nozzle plate (3) in such a manner that the ports (18, 15) emitting the fuel medium are located ahead of the nozzle plate (3).
  2. Apparatus according to claim 1, characterized in that a tube (7) is arranged at a distance ahead of the nozzle plate (3) in such a manner that a second opening (8) for the circulation of the flue gas is formed and that the tube (7) encloses the second nozzles (10) of the inner nozzle ring (12) and the gas guiding lance (16) with its gas exit openings (18) and projects forward be yond the mouth pieces of the second nozzles (10) and the face end of the gas guiding lance (16), such that two partial flows (I, II) consisting of recirculated flue gas and combustion air are produced.
  3. Apparatus according to one of the claims 1 and 2, characterized in that the first nozzles (9) have a larger inner diameter than the second nozzles (10).
  4. Apparatus according to one of the claims 1 to 3, characterized in that the first nozzles (9) are arranged inclined in the nozzle plate (3).
  5. Apparatus according to one of the claims 1 to 4, characterized in that the first nozzles (9) and/or the second nozzles (10) are equipped with means in order to cause a swirling of the inflowing combustion air.
  6. Apparatus according to one of the claims 1 to 5, characterized in that the first and second nozzles (9, 10) are designed conically with a broadened or constricted mouth opening (Figs. 3, 4).
  7. Apparatus according to one of the claims 1 to 6, characterized in that the oil feed lance (14) and the gas feed lance (16) are arranged displaceable relative to the nozzle plate (3).
  8. Apparatus according to one of the claims 1 to 7, characterized in that the atomizing nozzle (15) has a cone angle which is larger than 90°.
  9. Apparatus according to one of the claims 1 to 8, characterized in that the ports of the gas exit openings (18) are located in interstices relative to the second nozzles (10).
  10. Apparatus according to one of the claims 1 to 9, characterized in that the gas exit openings (18) lead in a radial direction away from the gas feed lance (16).
  11. Apparatus according to one of the claims 1 to 10, characterized in that the ports of the gas exit openings (18) and the ports of the second nozzles (10) of the inner nozzle ring (12) are located in a common plane.
  12. Apparatus according to one of the claims 1 to 11, characterized in that the fire tube (5) and the tube (7) are adjustable relative to the nozzle plate (3) in order to adjust the partial flows (I, II) by a changing of the cross sections of the openings (6, 8).
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 EP0386732A2 (en) 1990-09-12
EP0386732A3 EP0386732A3 (en) 1991-05-15
EP0386732B1 true EP0386732B1 (en) 1994-08-31

Family

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)

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

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4113412C2 (en) * 1991-04-20 1999-04-01 Saacke Gmbh & Co Kg Device for burning liquid or gaseous fuel for a furnace
DE19523094A1 (en) * 1995-06-26 1997-01-02 Abb Management Ag Combustion chamber
US5611683A (en) * 1995-08-04 1997-03-18 Air Products And Chemicals, Inc. Method and apparatus for reducing NOX production during air-oxygen-fuel combustion
EP0809070B1 (en) * 1996-05-19 2001-08-29 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
FR2782150B1 (en) * 1998-08-07 2000-11-10 Pillard Chauffage IMPROVEMENTS ON LOW-EMITTING AND LOW-EMITTING NITROGEN OXIDES BURNER
FR2800844B1 (en) * 1999-11-08 2002-04-19 Muller Et Cie DEVICE FOR IMPROVING THE COMBUSTION OF A PULSE AIR FUEL BURNER
EP1279895A1 (en) * 2001-07-25 2003-01-29 Compagnie Europeenne de Bruleurs Burner combustion head with a prevaporization zone for liquid fuel
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
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3327597A1 (en) * 1983-07-30 1985-02-07 Deutsche Babcock Werke AG, 4200 Oberhausen METHOD AND BURNER FOR BURNING LIQUID OR GASEOUS FUELS WITH REDUCED NOX PRODUCTION
FR2582781A1 (en) * 1985-06-04 1986-12-05 Mueller Rudolf BURNER FOR LIQUID COMBUSTION BOILER WITH COMBUSTION GAS RECYCLING CIRCUIT

Also Published As

Publication number Publication date
ATE110837T1 (en) 1994-09-15
CH678100A5 (en) 1991-07-31
EP0386732A3 (en) 1991-05-15
EP0386732A2 (en) 1990-09-12
DE59006932D1 (en) 1994-10-06

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