EP2864706A1 - Local improvement of the mixture of air and fuel in burners comprising swirl generators having blade ends that are crossed in the outer region - Google Patents

Local improvement of the mixture of air and fuel in burners comprising swirl generators having blade ends that are crossed in the outer region

Info

Publication number
EP2864706A1
EP2864706A1 EP13729697.6A EP13729697A EP2864706A1 EP 2864706 A1 EP2864706 A1 EP 2864706A1 EP 13729697 A EP13729697 A EP 13729697A EP 2864706 A1 EP2864706 A1 EP 2864706A1
Authority
EP
European Patent Office
Prior art keywords
burner
fuel
outflow
air
swirl
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.)
Granted
Application number
EP13729697.6A
Other languages
German (de)
French (fr)
Other versions
EP2864706B1 (en
Inventor
Bernd Prade
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP2864706A1 publication Critical patent/EP2864706A1/en
Application granted granted Critical
Publication of EP2864706B1 publication Critical patent/EP2864706B1/en
Not-in-force legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
    • F23R3/04—Air inlet arrangements
    • F23R3/10—Air inlet arrangements for primary air
    • F23R3/12—Air inlet arrangements for primary air inducing a vortex
    • F23R3/14—Air inlet arrangements for primary air inducing a vortex by using swirl vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
    • 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 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/07001—Air swirling vanes incorporating fuel injectors

Definitions

  • the invention relates to a burner with fuel mixing vortex generators and in particular the local improvement ⁇ tion of the mixture of air and fuel.
  • the uniform interference fuel into the Burn ⁇ voltage air is the central design task in the development of burners that operate mixed combustion in the area of so-called lean forward.
  • the temperature range of lean premix combustion is particularly useful in gas turbines because of the material-related limitation of the combustion chamber outlet temperature for controlling nitrogen oxide emissions.
  • the difficulty of premix combustion, especially under pressure, is the avoidance of uncontrollable combustion phenomena / self-ignitions within the premix, which are generally associated with the destruction of the premix.
  • the object of the invention is to provide a burner of the type mentioned, which is an improved mixture of air and fuel, in particular in the radially outer lie ⁇ the areas of Vormischumble enabled.
  • the invention solves this problem by providing that in such a burner with a substantially annular in cross-section, in the operation of air and fuel flow through the air supply and Vormischkanal formed by an outer shell and a hub and in the more
  • Swirl vanes are arranged, which extend from the hub to the outer shell in the radial direction and having a deflection surface, in a radial outer region of the Swirl blades at least one time and once decreases a flow angle to a main flow direction at an outflow end of the deflection in the radial direction.
  • the invention proceeds from the realization that the locally present turbulence intensity represents an additional influence ⁇ parameter to the interference of the fuel in the air. Increasing the turbulence intensity acts mi ⁇ research demanding.
  • the turbulence is then locally increased in the form of a vortex street because of the shear.
  • the swirl blades are at least partially designed as hollow blades with outlet openings for fuel.
  • the air supply and premixing channel concentrically surrounds a central pilot burner system.
  • the local application demanding mixture by turbulence against each other "entangled" blade ends improves the Mi ⁇ research quality in the outdoor section without loading the inner richly influence. Furthermore, the mixing quality is more independent of the operating conditions.
  • Figure 1 shows a burner in a highly schematic
  • Figure 2 is a plan view of a developed part of the
  • Figure 3 is a plan view of a swirl blade
  • Figure 4 in the radial direction of the hub to the outer shell staggered sections through a swirl blade.
  • the burner shown in Figure 1 which may optionally be used in conjunction with a plurality of identical burners, for example, in the combustor of a gas turbine plant to ⁇ summarizes an inner pilot burner system 2 and a pilot burner system 2 concentrically surrounding the main burner system 3.
  • solar well pilot burner system 2 as Main burner system 3 can also be operated with gaseous and / or liquid fuels, such as, for example, natural gas or heating oil.
  • the main burner system 3 comprises a radial outer air feed and premixing duct 4, also called annular air duct, which is formed by an outer jacket 5 and a hub 6 and through which swirl blades 7 of a swirl blading extend. These swirl blades 7 have outlet openings 8 for fuel, through the fuel gas into the air flowing in through the radial air supply and premixing duct 4
  • Figure 2 shows an unwound part of the Hauptbrennersys ⁇ tems 3 in plan view with the swirl blades 7 and 9 illustrates the areas of good and poor 10-interference of the fuel in air.
  • Figure 3 shows the view of the deflection surface 11 a
  • Swirl blade 7 of a burner 1 according to the invention extends in the burner 1 from the radially inner hub 6 (right, not shown) to the radially outer outer jacket 5 (left, not shown). Furthermore, the swirl blade 7 in the embodiment of Figure 3 is designed as a hollow blades with outlet openings 8 for fuel.
  • three regions 101, 102 and 103 are marked in the region of the outflow end 12 of the deflection surface 11, the regions 102 and 103 being attributable to the radial outer region of the blade 7.
  • FIG. 4 shows three successive sections through the regions 101, 102 and 103 of the swirl blade 7 of FIG. 3 as seen from the hub 6 to the outer jacket 5.

Landscapes

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

Abstract

The invention relates to a burner (1), comprising an air supply and premix channel (4) having an essentially annular cross-section, through which air and fuel flow during operation, and which is formed of an outer shell (5) and a hub (6). A plurality of swirl blades (7), which extend from the hub (6) to the outer shell (7) in a radial direction and are provided with a deflection surface (11), are arranged in said burner. In a radial outer region of the swirl blades (7), a downstream flow angle (alpha) to a main flow direction (13) increases at least once and decreases at least once in a radial direction at an outflow end (12) of the deflection surface (11).

Description

Beschreibung description
Lokale Verbesserung der Mischung von Luft und Brennstoff in Brennern mit Drallerzeugern mit im Außenbereich verschränkten Schaufelenden Local improvement of the mixture of air and fuel in burners with swirl generators with externally entangled blade ends
Die Erfindung betrifft einen Brenner mit Brennstoff einmischenden Drallerzeugern und insbesondere die lokale Verbesse¬ rung der Mischung von Luft und Brennstoff. The invention relates to a burner with fuel mixing vortex generators and in particular the local improvement ¬ tion of the mixture of air and fuel.
Die gleichmäßige Einmischung von Brennstoff in die Verbren¬ nungsluft ist die zentrale Designaufgabe bei der Entwicklung von Brennern, die im Bereich der sogenannten mageren Vor- mischverbrennung betrieben werden. Der Temperaturbereich der mageren Vormischverbrennung bietet sich in Gasturbinen wegen der materialbedingten Beschränkung der Brennkammeraustrittstemperatur zur Kontrolle von Stickoxidemissionen besonders an. Die Schwierigkeit der Vormischverbrennung, insbesondere unter Druck, ist die Vermeidung von unkontrollierbaren Ver- brennungserscheinungen/SelbstZündungen innerhalb der Vor- mischstrecke, welche in der Regel mit der Zerstörung der Vor- mischstrecke verbunden sind. The uniform interference fuel into the Burn ¬ voltage air is the central design task in the development of burners that operate mixed combustion in the area of so-called lean forward. The temperature range of lean premix combustion is particularly useful in gas turbines because of the material-related limitation of the combustion chamber outlet temperature for controlling nitrogen oxide emissions. The difficulty of premix combustion, especially under pressure, is the avoidance of uncontrollable combustion phenomena / self-ignitions within the premix, which are generally associated with the destruction of the premix.
Als Faustregel kann angenommen werden, dass eine möglichst homogene Vormischung auch in minimalen NOx-Emissionen resul- tiert. As a rule of thumb, it can be assumed that the most homogeneous possible premix results in minimal NO x emissions.
In der Regel sind technische Brenner annähernd rotationssym¬ metrisch aufgebaut und haben häufig einen oder mehrere konzentrisch umeinander angeordnete Drallerzeuger. Stand der Technik ist es mittlerweile, die Drallerzeugerschaufeln als Hohlschaufeln auszuführen und gleichzeitig als Usually technical burners are built nearly rotationssym ¬ metric and often have one or more concentrically arranged around each swirl generator. In the meantime, it is state of the art to design the swirl generator blades as hollow blades and at the same time as
Brennstoffeindüseelemente zu nutzen, siehe beispielsweise WO 2011/023669. Derartige Anordnungen führen meist dazu, dass es einen deutlichen Unterschied des Abstands von zwei benachbar- ten Schaufel auf der Nabe gegenüber dem Außenschnitt gibt, d.h. die Schaufeln stehen nabenseitig in der Regel deutlich näher zusammen als außen. Damit ergibt sich das Problem, den Brennstoff vor allem radial außen hinreichend weit in den Zwischenraum zwischen zwei Schaufeln einzudüsen, um eine möglichst gute Mischung zu erreichen, während das auf der Nabenseite deutlich leichter zu erreichen ist. Es gibt Vorschläge, dieses Problem zu lösen. In der Regel fällt die Verbesserung aber nicht übermäßig groß aus. Use fuel injector elements, see, for example, WO 2011/023669. Such arrangements usually lead to the fact that there is a clear difference between the distance of two adjacent blades on the hub from the outer cut, ie the blades are generally much closer together on the hub side than outside. This results in the problem of the fuel, especially radially outside sufficiently far in the Injecting space between two blades to achieve the best possible mixture, while on the hub side is much easier to achieve. There are suggestions to solve this problem. In general, the improvement is not overly large.
Beispiele sind: Examples are:
- Vergrößerung der Brennstoff-Bohrungsdurchmesser von innen nach außen. Damit lässt sich zwar eine partielle, wenn auch nicht völlig ausreichende Verbesserung der Eindringtiefe der Brennstoffstrahlen erreichen, gleichzeitig nimmt aber die erforderliche Mischungsstrecke zu (skaliert etwa mit dem  - Enlargement of the fuel bore diameter from inside to outside. Thus, although a partial, albeit not completely sufficient improvement in the penetration depth of the fuel jets reach, but at the same time increases the required mixing distance (scales approximately with the
Durchmesser der Brennstoffbohrung) . Diameter of the fuel hole).
- Erhöhung der Anzahl der Schaufelzahl. Dies ist konstruktiv und aerodynamisch begrenzt durch den verfügbaren Platz auf der Nabe und die zunehmende Blockierung der Luftströmung na- benseitig .  - Increasing the number of blades. This is constructively and aerodynamically limited by the available space on the hub and the increasing blockage of the air flow on the side.
- Verwendung stark 3-dimensionaler Schaufelprofile mit zunehmender Schaufelstärke mit steigendem Abstand von der Nabe. Auch hierdurch kommt es zu Problemen hinsichtlich der aerodynamischen Kontur der Schaufel, diesmal im Außenschnitt, um von der großen Schaufelstärke in der Ebene der Brennstoffboh- rungen wieder auf ein sehr dünnes Schaufelende zu kommen, d.h. die Schaufeln würden dann außen sehr lang.  - Using strong 3-dimensional blade profiles with increasing blade thickness with increasing distance from the hub. This also causes problems with regard to the aerodynamic contour of the blade, this time in an external section, in order to get back to a very thin blade end from the large blade thickness in the plane of the fuel bores, i. the blades would then be very long outside.
Aufgabe der Erfindung ist es, einen Brenner der eingangs genannten Art bereitzustellen, der eine verbesserte Mischung von Luft und Brennstoff, insbesondere in radial außen liegen¬ den Bereichen der Vormischstrecke, ermöglicht. The object of the invention is to provide a burner of the type mentioned, which is an improved mixture of air and fuel, in particular in the radially outer lie ¬ the areas of Vormischstrecke enabled.
Die Erfindung löst diese Aufgabe, indem sie vorsieht, dass bei einem derartigen Brenner mit einem im Querschnitt im Wesentlichen ringförmigen, im Betrieb von Luft und Brennstoff durchströmten Luftzufuhr-und-Vormischkanal , der durch einen Außenmantel und eine Nabe gebildet ist und in dem mehrereThe invention solves this problem by providing that in such a burner with a substantially annular in cross-section, in the operation of air and fuel flow through the air supply and Vormischkanal formed by an outer shell and a hub and in the more
Drallschaufeln angeordnet sind, die sich von der Nabe bis zum Außenmantel in radialer Richtung erstrecken und eine Umlenkfläche aufweisen, in einem radialen Außenbereich der Drallschaufeln ein Abströmwinkel zu einer Hauptströmungsrichtung an einem Abströmende der Umlenkfläche in radialer Richtung mindestens einmal zu- und einmal abnimmt. Die Erfindung geht von der Erkenntnis aus, dass die lokal vorliegende Turbulenzintensität einen zusätzlichen Einfluss¬ parameter auf die Einmischung des Brennstoffs in die Luft darstellt. Eine Erhöhung der Turbulenzintensität wirkt mi¬ schungsfordernd . Swirl vanes are arranged, which extend from the hub to the outer shell in the radial direction and having a deflection surface, in a radial outer region of the Swirl blades at least one time and once decreases a flow angle to a main flow direction at an outflow end of the deflection in the radial direction. The invention proceeds from the realization that the locally present turbulence intensity represents an additional influence ¬ parameter to the interference of the fuel in the air. Increasing the turbulence intensity acts mi ¬ research demanding.
Es wird daher vorgeschlagen, insbesondere im Außenschnitt, die Turbulenzintensität zu erhöhen, bzw. mischungsfordernde Wirbelstraßen zu erzeugen. In einer vorteilhaften Ausführungsform liegt ein It is therefore proposed, in particular in the outer section, to increase the turbulence intensity or to generate mixing-requiring vortex streets. In an advantageous embodiment is a
Abströmwinkel ι an einem radial innen liegenden Abströmende der Umlenkfläche zwischen einem Abströmwinkel aj- eines radial außen liegenden Abströmendes und einem Abströmwinkel CX2 eines dazwischen liegenden Abströmendes. In den Scherzonen der Be- reiche mit unterschiedlichen Abströmwinkeln wird dann wegen der Scherung die Turbulenz lokal in Form einer Wirbelstraße erhöht .  Outflow angle ι at a radially inner outflow end of the deflection between an outflow angle aj- a radially outer outflow end and an outflow angle CX2 an outflow end lying therebetween. In the shear zones of the regions with different outflow angles, the turbulence is then locally increased in the form of a vortex street because of the shear.
Dabei kann es zweckmäßig sein, wenn benachbarte It may be appropriate if adjacent
Drallschaufeln unterschiedliche radiale Verläufe ihrer Swirl blades different radial courses of their
Abströmwinkel aufweisen. Have flow angle.
Bevorzugtermaßen sind die Drallschaufeln zumindest zum Teil als Hohlschaufeln mit Auslassöffnungen für Brennstoff ausge- führt. Preferably, the swirl blades are at least partially designed as hollow blades with outlet openings for fuel.
Es ist zweckmäßig, wenn der Luft zufuhr-und-Vormischkanal ein zentrales Pilotbrennersystem konzentrisch umgibt. Die lokale Anwendung mischungsfordernder Turbulenz durch gegeneinander „verschränkte" Schaufelenden verbessert die Mi¬ schungsqualität im Außenschnitt, ohne die innen liegenden Be- reiche stark zu beeinflussen. Weiterhin wird die Mischungsqualität unabhängiger von den Betriebsbedingungen. It is expedient if the air supply and premixing channel concentrically surrounds a central pilot burner system. The local application demanding mixture by turbulence against each other "entangled" blade ends improves the Mi ¬ research quality in the outdoor section without loading the inner richly influence. Furthermore, the mixing quality is more independent of the operating conditions.
Die Erfindung wird beispielhaft anhand der Zeichnungen näher erläutert. Es zeigen nicht maßstäblich: The invention will be explained in more detail by way of example with reference to the drawings. It does not show to scale:
Figur 1 einen Brenner in einer stark schematisierten Figure 1 shows a burner in a highly schematic
Prinzipskizze,  Schematic diagram,
Figur 2 eine Draufsicht auf einen abgewickelten Teil des  Figure 2 is a plan view of a developed part of the
Hauptbrennersystems,  Main burner system,
Figur 3 eine Draufsicht auf eine Drallschaufel und  Figure 3 is a plan view of a swirl blade and
Figur 4 in radialer Richtung von der Nabe zum Außenmantel versetzte Schnitte durch eine Drallschaufel. Der in Figur 1 gezeigte Brenner 1, der ggf. in Verbindung mit mehreren gleichartigen Brennern beispielsweise in der Brennkammer einer Gasturbinenanlage eingesetzt werden kann, um¬ fasst ein inneres Pilotbrennersystem 2 und ein das Pilotbrennersystem 2 konzentrisch umgebendes Hauptbrennersystem 3. So- wohl Pilotbrennersystem 2 als auch Hauptbrennersystem 3 können wahlweise mit gasförmigen und/oder flüssigen Brennstoffen, wie bspw. Erdgas oder Heizöl, betrieben werden. Figure 4 in the radial direction of the hub to the outer shell staggered sections through a swirl blade. The burner shown in Figure 1 1, which may optionally be used in conjunction with a plurality of identical burners, for example, in the combustor of a gas turbine plant to ¬ summarizes an inner pilot burner system 2 and a pilot burner system 2 concentrically surrounding the main burner system 3. solar well pilot burner system 2 as Main burner system 3 can also be operated with gaseous and / or liquid fuels, such as, for example, natural gas or heating oil.
Das Hauptbrennersystem 3 umfasst einen radialen äußeren Luft- zufuhr-und-Vormischkanal 4, auch Ringluftkanal genannt, der durch einen Außenmantel 5 und eine Nabe 6 gebildet ist und durch den sich Drallschaufeln 7 einer Drallbeschaufelung erstrecken. Diese Drallschaufeln 7 weisen Auslassöffnungen 8 für Brennstoff auf, durch die Brenngas in die durch den radi- alen Luftzufuhr-und-Vormischkanal 4 einströmende Luft The main burner system 3 comprises a radial outer air feed and premixing duct 4, also called annular air duct, which is formed by an outer jacket 5 and a hub 6 and through which swirl blades 7 of a swirl blading extend. These swirl blades 7 have outlet openings 8 for fuel, through the fuel gas into the air flowing in through the radial air supply and premixing duct 4
eingedüst werden kann. can be injected.
Figur 2 zeigt einen abgewickelten Teil des Hauptbrennersys¬ tems 3 in der Draufsicht mit den Drallschaufeln 7 und verdeutlicht die Bereiche guter 9 und schlechter Einmischung 10 des Brennstoffs in Luft. Radial innen, also in Nähe der Nabe 6, stehen die Schaufeln 7 vergleichsweise dicht beieinander, so dass der Brennstoff hinreichend weit in den Zwischenraum zwischen zwei Schaufeln 7 eingedüst werden kann, um eine möglichst gute Durchmischung zu erzielen. Radial außen, in der Nähe des Außenmantels 5, sind die Schaufeln 7 entsprechend weiter voneinander entfernt, wodurch eine hinreichend weite Eindüsung des Brennstoffs in die Luft erschwert ist. Figure 2 shows an unwound part of the Hauptbrennersys ¬ tems 3 in plan view with the swirl blades 7 and 9 illustrates the areas of good and poor 10-interference of the fuel in air. Radially inside, ie in the vicinity of the hub 6, the blades 7 are comparatively close to each other, so that the fuel sufficiently far into the gap can be injected between two blades 7 in order to achieve the best possible mixing. Radially outside, in the vicinity of the outer shell 5, the blades 7 are correspondingly farther apart, whereby a sufficiently wide injection of the fuel into the air is difficult.
Figur 3 zeigt die Ansicht der Umlenkfläche 11 einer Figure 3 shows the view of the deflection surface 11 a
Drallschaufel 7 eines Brenners 1 nach der Erfindung. Die Drallschaufel 7 erstreckt sich im Brenner 1 von der radial innen liegenden Nabe 6 (rechts, nicht gezeigt) bis zum radial außen liegenden Außenmantel 5 (links, nicht gezeigt) . Ferner ist die Drallschaufel 7 im Ausführungsbeispiel der Figur 3 als Hohlschaufeln mit Auslassöffnungen 8 für Brennstoff ausgeführt. Zum besseren Verständnis der Erfindung sind im Be- reich des Abströmendes 12 der Umlenkfläche 11 drei Bereiche 101, 102 und 103 gekennzeichnet, wobei die Bereiche 102 und 103 dem radialen Außenbereich der Schaufel 7 zuzurechnen sind . Figur 4 zeigt drei hintereinander gelegte Schnitte durch die Bereiche 101, 102 und 103 der Drallschaufel 7 der Figur 3 mit Blickrichtung von der Nabe 6 zum Außenmantel 5. Man erkennt, dass an einem radial innen liegenden Abströmende 12 der Umlenkfläche 11, d.h. im Schnitt durch den Bereich 101, der Abströmwinkel ι zu einer Hauptströmungsrichtung 13 zwischen einem Abströmwinkel aj- eines radial außen liegenden Abströ¬ mendes 12, d.h. im Schnitt durch den Bereich 103, und einem Abströmwinkel CX2 eines dazwischen liegenden Abströmendes, d.h. im Schnitt durch den Bereich 102, liegt. Andere Ausfüh- rungsformen der Drallschaufel 7, bei der in einem radialenSwirl blade 7 of a burner 1 according to the invention. The swirl blade 7 extends in the burner 1 from the radially inner hub 6 (right, not shown) to the radially outer outer jacket 5 (left, not shown). Furthermore, the swirl blade 7 in the embodiment of Figure 3 is designed as a hollow blades with outlet openings 8 for fuel. For a better understanding of the invention, three regions 101, 102 and 103 are marked in the region of the outflow end 12 of the deflection surface 11, the regions 102 and 103 being attributable to the radial outer region of the blade 7. FIG. 4 shows three successive sections through the regions 101, 102 and 103 of the swirl blade 7 of FIG. 3 as seen from the hub 6 to the outer jacket 5. It can be seen that at a radially inward outflow end 12 of the deflection surface 11, ie in section through the region 101, the outflow angle ι to a main flow direction 13 between an outflow angle aj- a radially outer Abströ ¬ end 12, ie in section through the region 103, and an outflow angle CX2 an intervening outflow end, ie in section through the area 102, lies. Other embodiments of the swirl blade 7, in which in a radial
Außenbereich ein Abströmwinkel zu einer Hauptströmungsrichtung 13 an einem Abströmende 12 der Umlenkfläche 11 in radia¬ ler Richtung mindestens einmal zu- und einmal abnimmt, sind ebenso möglich, solange im Außenbereich der Drallschaufel 7, d.h. in der Nähe des Außenmantels 5, am Schaufelende eine Art Verschränkung geschaffen wird, so dass dort in der im Betrieb entstehenden Scherzone eine mischende Wirbelstraße erzeugt wird . Outside an outflow angle to a main flow direction 13 at a discharge end 12 of the deflection 11 in radia ¬ ler direction at least once and even decreases, are also possible, as in the outer region of the swirl blade 7, ie in the vicinity of the outer shell 5, at the blade end a kind Entanglement is created so that there is generated in the resulting shear zone in operation a mixing vortex street.

Claims

Patentansprüche claims
1. Brenner (1) mit einem im Querschnitt im Wesentlichen 1. burner (1) having a substantially in cross section
ringförmigen, im Betrieb von Luft und Brennstoff durch- strömten Luftzufuhr-und-Vormischkanal (4), der durch ei¬ nen Außenmantel (5) und eine Nabe (6) gebildet ist und in dem mehrere Drallschaufeln (7) angeordnet sind, die sich von der Nabe (6) bis zum Außenmantel (7) in radialer Richtung erstrecken und eine Umlenkfläche (11) aufweisen, dadurch gekennzeichnet, dass in einem radialen Außenbe¬ reich der Drallschaufeln (7) ein Abströmwinkel ( ) zu einer Hauptströmungsrichtung (13) an einem Abströmende (12) der Umlenkfläche (11) in radialer Richtung mindestens einmal zu- und einmal abnimmt. annular, in the operation of air and fuel flowing through the air supply and Vormischkanal (4), which is formed by ei ¬ nen outer jacket (5) and a hub (6) and in which a plurality of swirl blades (7) are arranged, the extending from the hub (6) to the outer casing (7) in the radial direction and having a deflection surface (11), characterized in that in a radial Außenbe ¬ rich of the swirl blades (7) an outflow angle () to a main flow direction (13) an outflow end (12) of the deflection surface (11) in the radial direction at least once and decreases once.
2. Brenner (1) nach Anspruch 1, wobei an einem radial innen liegenden Abströmende (12) der Umlenkfläche (11) ein Abströmwinkel ( ι) zwischen einem Abströmwinkel (0(3) ei¬ nes radial außen liegenden Abströmendes (12) und einem Abströmwinkel (0(2) eines dazwischen liegenden Abströmen¬ des (12) liegt. 2. Burner (1) according to claim 1, wherein at a radially inner outflow end (12) of the deflection surface (11) an outflow angle (ι) between an outflow angle (0 ( 3 ) ei ¬ nes radially outward discharge end (12) and a Outflow angle (0 ( 2 ) of an intermediate outflow ¬ (12) is located.
3. Brenner (1) nach einem der Ansprüche 1 oder 2, wobei benachbarte Drallschaufeln (7) unterschiedliche radiale Verläufe ihrer Abströmwinkel ( ) aufweisen. 3. burner (1) according to any one of claims 1 or 2, wherein adjacent swirl vanes (7) have different radial profiles of their outflow angle ().
4. Brenner (1) nach einem der vorhergehenden Ansprüche, wobei die Drallschaufeln (7) zumindest zum Teil als Hohlschaufeln mit Auslassöffnungen (8) für Brennstoff ausge- führt sind. 4. Burner (1) according to one of the preceding claims, wherein the swirl blades (7) are at least partially designed as hollow blades with outlet openings (8) for fuel.
5. Brenner (1) nach einem der vorhergehenden Ansprüche, wobei der Luftzufuhr-und-Vormischkanal (4) ein zentrales Pilotbrennersystem (2) konzentrisch umgibt. 5. burner (1) according to any one of the preceding claims, wherein the air supply and premixing channel (4) concentrically surrounds a central pilot burner system (2).
EP13729697.6A 2012-08-06 2013-06-13 Local improvement of the mixture of air and fuel in burners comprising swirl generators having blade ends that are crossed in the outer region Not-in-force EP2864706B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012213853 2012-08-06
PCT/EP2013/062248 WO2014023462A1 (en) 2012-08-06 2013-06-13 Local improvement of the mixture of air and fuel in burners comprising swirl generators having blade ends that are crossed in the outer region

Publications (2)

Publication Number Publication Date
EP2864706A1 true EP2864706A1 (en) 2015-04-29
EP2864706B1 EP2864706B1 (en) 2016-11-02

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EP13729697.6A Not-in-force EP2864706B1 (en) 2012-08-06 2013-06-13 Local improvement of the mixture of air and fuel in burners comprising swirl generators having blade ends that are crossed in the outer region

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US (1) US10012386B2 (en)
EP (1) EP2864706B1 (en)
KR (1) KR20150039763A (en)
CN (1) CN104471317B (en)
RU (1) RU2633475C2 (en)
WO (1) WO2014023462A1 (en)

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Also Published As

Publication number Publication date
EP2864706B1 (en) 2016-11-02
RU2633475C2 (en) 2017-10-12
CN104471317A (en) 2015-03-25
KR20150039763A (en) 2015-04-13
CN104471317B (en) 2016-09-07
WO2014023462A1 (en) 2014-02-13
US20150285499A1 (en) 2015-10-08
US10012386B2 (en) 2018-07-03
RU2015107562A (en) 2016-09-27

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