EP3134682B1 - Burner assembly - Google Patents

Burner assembly Download PDF

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Publication number
EP3134682B1
EP3134682B1 EP15788377.8A EP15788377A EP3134682B1 EP 3134682 B1 EP3134682 B1 EP 3134682B1 EP 15788377 A EP15788377 A EP 15788377A EP 3134682 B1 EP3134682 B1 EP 3134682B1
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EP
European Patent Office
Prior art keywords
burner assembly
end plate
depression
edge
annular space
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EP15788377.8A
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German (de)
French (fr)
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EP3134682A1 (en
Inventor
Olga Deiss
Thomas Grieb
Patrick Lapp
Jens Kleinfeld
Matthias CHLEBOWSKI
Fabian SANDER
Christian Beck
Andreas Böttcher
Patrick Ronald Flohr
Thomas Hauser
Simon Purschke
Günther WALZ
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Siemens AG
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Siemens AG
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23RGENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/283Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23RGENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/02Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
    • F23R3/04Air inlet arrangements
    • F23R3/10Air inlet arrangements for primary air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23RGENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/286Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23RGENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/03043Convection cooled combustion chamber walls with means for guiding the cooling air flow

Definitions

  • the invention relates to a burner arrangement, in particular for a gas turbine plant.
  • a burner arrangement in particular for a gas turbine plant.
  • gas turbines there are always higher turbine inlet temperatures in order to achieve increased performance and higher efficiency.
  • appropriate burners must be provided.
  • These burners should also meet the highest requirements in terms of production and service, which is why, among other things, there are also high requirements in terms of service life.
  • components which are exposed to high temperatures or temperature gradients such as, for example, the combustion chamber facing end plate of a burner, experienced during operation high local stresses, which among other things lead to spalling of ceramic coatings and thus to early component failure.
  • document US 2010/300106 A1 describes a burner assembly according to the preamble of claim 1.
  • the object of the invention is to further develop said device, so that a high component life is guaranteed even with higher requirements in terms of temperature and temperature gradients.
  • the invention solves this problem by providing that in such a burner arrangement with a combustion chamber, a plurality of merging into the combustion chamber mixing channels are mixed in which initiated during normal operation combustion air and fuel introduced, wherein the mixing channels are formed by mixing tubes, axially extending through an annulus defined between a tubular outer wall, a tubular inner wall spaced radially from the outer wall, an upstream annular end plate, and a downstream annular end plate is, wherein the end plates are provided with through holes which receive and / or continue the mixing tubes and both radially inwardly and radially outwardly extending in the direction of the annulus peripheral edge, provided in the downstream annular end plate axial holes in the edge, which extend substantially parallel to a normal of the end plate from the annular space forth in the end plate and that at least one branching off from the axial bore opening for the removal of cooling air is provided.
  • cooling air can be easily transported into thermally stressed areas of the burner in order to reduce the temperature during operation or to ensure a more homogeneous temperature distribution. This measure reduces temperature-induced stresses in the material and extends the life of the component.
  • the at least one opening opens into a chamber or a cooling air pocket which is open towards the annular space.
  • the accumulation of material in the combustion chamber near area is reduced.
  • a more homogeneous temperature distribution results.
  • the temperature-induced voltages can be significantly reduced.
  • the highest thermal loads of the face plate are found in its radially outer and radially inner edges. It is therefore advantageous if holes are arranged in these areas.
  • the opening opens into an elongated recess which extends from the combustion chamber upstream in the edge of the end plate.
  • this component is made more flexible at heavily loaded areas and can thus respond better to thermal expansion without the voltage values becoming too great. It is therefore particularly advantageous if the recess is arranged radially inward in the inner edge, because there the voltage values of the component are highest. Rinsing with air from the bores serves to avoid dead zones in the well where the hot air stops.
  • the face plate continues to seal against the combustion chamber, it is advantageous if the length of the recess is smaller than the height of the edge.
  • the bottom of the depression has a cross-sectional profile of the set circle, oval, ellipse, so that sources of increased material stresses, such as e.g. Edges, to be avoided.
  • the openings of two holes open into a depression in such a way that opposite sides of the depression can be cooled by impingement cooling.
  • further openings are arranged in the direction of the annular space in the depression.
  • the further openings can be used as resonator openings.
  • ECM electrochemical erosion
  • EDM spark erosion
  • SLM selective laser melting
  • the mentioned embodiments of the invention lead, both individually and in combination, to the reduction of voltage peaks and thus to an increased service life of the end plate.
  • the face plate heats up evenly during transient processes and even in stationary operation, a more homogeneous temperature distribution. This leads to lower temperature loads under the same thermal conditions. Thus, they allow a significant lifetime extension of the face plate under the same thermal boundary conditions.
  • the control range increases during operation and there are also cheaper alternatives with regard to materials and coatings.
  • the figures show a burner assembly 1 according to an embodiment of the present invention or components thereof.
  • the burner assembly 1 of FIG. 1 comprises a combustion chamber 2, a centrally located pilot burner 23, a mixing tube assembly 24 having a plurality of mixing tubes 6 forming mixing channels 3 opening into the combustion chamber 2, a plurality of fuel injectors 25 protruding into the mixing tubes 6 to a suitable position , and a mounting plate 26 which receives the mixing tube assembly 24 and serves to fasten the burner assembly 1 to a machine housing, not shown.
  • the mixing tube assembly 24 comprises a tubular outer wall 8, a tubular inner wall 9 spaced radially from the outer wall 8, an upstream annular end plate 10 and a downstream face plate 11 defining an annulus 7 through which the mixing tubes 6 extend in the axial direction ,
  • the end plate 11 has a both radially inward and radially outward in the direction of the annular space 7 extending peripheral edge 13, 14.
  • the mixing tube assembly 24 includes an annular partition plate 27.
  • the upstream face plate 10 includes a plurality of through holes 12 which receive and / or continue the mixing tubes 6.
  • the passage openings 12 define two hole circles with mutually different pitch circle diameters, wherein the passage openings 12 of the first pitch circle and the passage openings 12 of the second pitch circle are arranged offset from one another in the radial direction.
  • the face plate 10 has a plurality of in the FIG. 1 Air ducts, not shown, which extend in the axial direction and are distributed over the annular surface of the end plate 10.
  • the partition plate 27 is analogous to the end plate 10 is provided with through holes 28 which are aligned with the through holes 12 of the end plate 10 in the axial direction. Further, the partition plate 27 is provided with a plurality of scavenging air channels 29 distributed over the annular surface of the partition plate 27.
  • the downstream arranged face plate 11 comprises analogous to the end plate 10 and the partition plate 27 through holes 12 which are aligned axially with the through holes 12 of the end plate 10 and the through holes 28 of the partition plate 27. Further, in the face plate 11 are axially extending Air channels 30 are formed, which connect the annular space 7 with the combustion chamber 2 fluidly.
  • a fuel 5 and combustion air 4 flow through the jet nozzles, i. the mixing tubes 6, and arrive as a fuel-air mixture in the combustion chamber. 2
  • FIG. 2 shows the downstream annular end plate 11 with through holes 12 and axial holes 15 in the edge 13, 14 both radially inward and radially outward.
  • the bores 15 extend substantially parallel to a normal of the end plate 11 from the annular space 7 into the end plate 11.
  • FIG. 3 It can be seen that at least one opening 16 branching off from the axial bore 15 is provided for the removal of cooling air 17.
  • FIG. 4 It can be seen how several holes 15 open into the chamber 18.
  • FIG. 5 shows it again at a different angle and in section.
  • the chambers 18 or cooling air pockets may consist of a combination of holes and cutouts or be made by other manufacturing processes.
  • the placement at the points of high temperature on the inner cylindrical surface and the outer cylindrical surface of the face plate lead to a better temperature distribution and thus lower temperature-induced stresses.
  • FIG. 6 shows an embodiment of the invention with elongated recesses 19 which extend from the combustion chamber 2 upstream in the edge 13 of the end plate 11.
  • the depressions are arranged radially inward in the inner edge 13. Its length is smaller than the height of the edge 13th
  • FIG. 7 the structures inside the rim 13 of the end plate 11 are shown.
  • two holes 15 are assigned to a recess 19.
  • the holes 15 have openings 16 for the removal of cooling air 17.
  • This cooling air 17 flows through channels 31 to the recess 19.
  • the openings 16 and the channels 31 are arranged so that opposite sides 21 of the recess 19 can be cooled by impingement cooling.
  • FIG. 7 also shows that the base 20 of the recess 19 has a cross-sectional profile of the set circle, oval, ellipse. Furthermore, in the FIG. 7 to see that 19 further openings 22 are arranged in the direction of the annular space 7 in the recess.
  • FIG. 8 shows a view of the same embodiment with a section through a recess 19. It can be seen the round base 20 of the recess 19 and the channels 31, coming from the openings 16 of the holes 15 coming into the recess 19, and other openings 22, which of the Recesses 19, starting in the annular space 7 open.
  • FIG. 9 shows the view from the combustion chamber side on the edge 13 in a recess along its longitudinal axis. One recognizes the outlets of the channels 31.

Description

Die Erfindung betrifft eine Brenneranordnung, insbesondere für eine Gasturbinenanlage.
Im Zuge der Weiterentwicklung von Gasturbinen kommt es zu immer höheren Turbineneintrittstemperaturen, um gesteigerte Leistung und einen höheren Wirkungsgrad zu erreichen. Hierzu müssen u.a. entsprechende Brenner bereitgestellt werden.
Diese Brenner sollen auch im Hinblick auf Fertigung und Service höchsten Anforderungen genügen, weshalb u.a. auch hohe Anforderungen hinsichtlich der Lebensdauer bestehen. Insbesondere Komponenten, welche hohen Temperaturen bzw. Temperaturgradienten ausgesetzt sind, wie beispielsweise die der Brennkammer zugewandte Stirnplatte eines Brenners, erfahren im Betrieb hohe lokale Spannungen, welche u.a. zum Abplatzen keramischer Beschichtungen und somit zu frühem Bauteilversagen führen. Dokument US 2010/300106 A1 beschreibt eine Brenneranordnung gemäß der Präambel des Anspruchs 1.
The invention relates to a burner arrangement, in particular for a gas turbine plant.
In the course of the further development of gas turbines, there are always higher turbine inlet temperatures in order to achieve increased performance and higher efficiency. For this, among other things, appropriate burners must be provided.
These burners should also meet the highest requirements in terms of production and service, which is why, among other things, there are also high requirements in terms of service life. In particular, components which are exposed to high temperatures or temperature gradients, such as, for example, the combustion chamber facing end plate of a burner, experienced during operation high local stresses, which among other things lead to spalling of ceramic coatings and thus to early component failure. document US 2010/300106 A1 describes a burner assembly according to the preamble of claim 1.

Aufgabe der Erfindung ist es, die genannte Vorrichtung weiterzuentwickeln, so dass auch bei höheren Anforderungen hinsichtlich Temperatur und Temperaturgradienten eine hohe Bauteillebensdauer gewährleistet ist.
Die Erfindung löst diese Aufgabe, indem sie vorsieht, dass bei einer derartigen Brenneranordnung mit einer Brennkammer, einer Vielzahl von in die Brennkammer mündenden Mischkanälen, in denen während des bestimmungsgemäßen Betriebs eingeleitete Verbrennungsluft und eingeleiteter Brennstoff gemischt werden, wobei die Mischkanäle durch Mischrohre gebildet sind, die sich axial durch einen Ringraum erstrecken, der zwischen einer rohrförmigen Außenwand, einer radial von der Außenwand beabstandet angeordneten rohrförmigen Innenwand, einer stromaufwärts angeordneten ringförmigen Stirnplatte und einer stromabwärts angeordneten ringförmigen Stirnplatte definiert ist, wobei die Stirnplatten mit Durchgangsöffnungen versehen sind, welche die Mischrohre aufnehmen und/oder fortsetzen und sowohl radial innen als auch radial außen einen sich in Richtung des Ringraums erstreckenden umlaufenden Rand aufweisen, in der stromabwärts angeordneten ringförmigen Stirnplatte axiale Bohrungen im Rand vorgesehen sind, die sich im Wesentlichen parallel zu einer Normalen der Stirnplatte vom Ringraum her in die Stirnplatte hinein erstrecken und dass mindestens eine von der axialen Bohrung abzweigende Öffnung zur Abfuhr von Kühlluft vorgesehen ist.
The object of the invention is to further develop said device, so that a high component life is guaranteed even with higher requirements in terms of temperature and temperature gradients.
The invention solves this problem by providing that in such a burner arrangement with a combustion chamber, a plurality of merging into the combustion chamber mixing channels are mixed in which initiated during normal operation combustion air and fuel introduced, wherein the mixing channels are formed by mixing tubes, axially extending through an annulus defined between a tubular outer wall, a tubular inner wall spaced radially from the outer wall, an upstream annular end plate, and a downstream annular end plate is, wherein the end plates are provided with through holes which receive and / or continue the mixing tubes and both radially inwardly and radially outwardly extending in the direction of the annulus peripheral edge, provided in the downstream annular end plate axial holes in the edge, which extend substantially parallel to a normal of the end plate from the annular space forth in the end plate and that at least one branching off from the axial bore opening for the removal of cooling air is provided.

Dadurch lässt sich auf einfache Weise Kühlluft in thermisch belastete Bereiche des Brenners transportieren, um dort die Temperatur im Betrieb zu verringern bzw. für eine homogenere Temperaturverteilung zu sorgen. Diese Maßnahme verringert temperaturinduzierte Spannungen im Material und verlängert die Lebensdauer des Bauteils.As a result, cooling air can be easily transported into thermally stressed areas of the burner in order to reduce the temperature during operation or to ensure a more homogeneous temperature distribution. This measure reduces temperature-induced stresses in the material and extends the life of the component.

In einer vorteilhaften Ausführungsform mündet die mindestens eine Öffnung in eine Kammer oder eine Kühllufttasche, welche zum Ringraum hin geöffnet ist. Infolge dieser Kammern oder Kühllufttaschen ist die Materialanhäufung im brennkammernahen Bereich verringert. Ferner ergibt sich eine homogenere Temperaturverteilung. Damit können die temperaturinduzierten Spannungen deutlich verringert werden.In an advantageous embodiment, the at least one opening opens into a chamber or a cooling air pocket which is open towards the annular space. As a result of these chambers or cooling air pockets, the accumulation of material in the combustion chamber near area is reduced. Furthermore, a more homogeneous temperature distribution results. Thus, the temperature-induced voltages can be significantly reduced.

Zweckmäßigerweise münden mehrere Bohrungen in die Kammer bzw. Kühllufttasche. Somit lässt sich der Kühleffekt in der Kammer bzw. der Kühllufttasche maximieren.Conveniently, several holes open into the chamber or cooling air pocket. Thus, the cooling effect in the chamber or the cooling air pocket can be maximized.

Typischerweise finden sich die höchsten thermischen Belastungen der Stirnplatte in ihrem radial äußeren und ihrem radial inneren Rand. Es ist daher vorteilhaft, wenn Bohrungen in diesen Bereichen angeordnet sind.Typically, the highest thermal loads of the face plate are found in its radially outer and radially inner edges. It is therefore advantageous if holes are arranged in these areas.

In einer weiteren vorteilhaften Ausführungsform der Erfindung mündet die Öffnung in eine längliche Vertiefung, die sich von der Brennkammer aus stromaufwärts im Rand der Stirnplatte erstreckt. Durch das Einbringen von Entlastungsschlitzen in thermisch beanspruchte Bereiche wird diese Komponente an hochbelasteten Stellen flexibler gemacht und kann so besser auf thermische Ausdehnungen reagieren, ohne dass die Spannungswerte zu groß werden. Es ist daher besonders vorteilhaft, wenn die Vertiefung radial innen im inneren Rand angeordnet ist, weil dort die Spannungswerte des Bauteils am höchsten sind. Das Spülen mit Luft aus den Bohrungen dient der Vermeidung von Totgebieten in der Vertiefung, in denen die heiße Luft stehen bleibt.In a further advantageous embodiment of the invention, the opening opens into an elongated recess which extends from the combustion chamber upstream in the edge of the end plate. By introducing relief slots into areas subjected to thermal stress, this component is made more flexible at heavily loaded areas and can thus respond better to thermal expansion without the voltage values becoming too great. It is therefore particularly advantageous if the recess is arranged radially inward in the inner edge, because there the voltage values of the component are highest. Rinsing with air from the bores serves to avoid dead zones in the well where the hot air stops.

Damit die Stirnplatte weiterhin gegen die Brennkammer abdichtet, ist es zweckmäßig, wenn die Länge der Vertiefung kleiner als die Höhe des Randes ist.Thus, the face plate continues to seal against the combustion chamber, it is advantageous if the length of the recess is smaller than the height of the edge.

Ferner ist es im Hinblick darauf, dass mit diesen Maßnahmen Spannungen im Material verringert werden sollen sinnvoll, wenn der Grund der Vertiefung ein Querschnittsprofil aus der Menge Kreis, Oval, Ellipse aufweist, so dass Quellen für erhöhte Materialspannungen, wie z.B. Kanten, vermieden werden.Furthermore, in view of reducing stresses in the material with these measures, it makes sense if the bottom of the depression has a cross-sectional profile of the set circle, oval, ellipse, so that sources of increased material stresses, such as e.g. Edges, to be avoided.

Vorteilhafter Weise münden die Öffnungen zweier Bohrungen derart in eine Vertiefung, dass gegenüberliegende Seiten der Vertiefung durch Prallkühlung gekühlt werden können.Advantageously, the openings of two holes open into a depression in such a way that opposite sides of the depression can be cooled by impingement cooling.

Schließlich ist es vorteilhaft, wenn in der Vertiefung weitere Öffnungen in Richtung des Ringraums angeordnet sind. Die weiteren Öffnungen können als Resonatoröffnungen verwendet werden. Durch diese zusätzlichen Resonatoren kann die Anzahl evtl. bereits vorhandener Resonatorbohrungen an der brennerseitigen Stirnplatte verringert werden, wodurch der Abstand zwischen den Resonatorbohrungen vergrößert und somit die Spannungen zwischen den Resonatorbohrungen verringert werden.Finally, it is advantageous if further openings are arranged in the direction of the annular space in the depression. The further openings can be used as resonator openings. By means of these additional resonators, the number of possibly existing resonator bores on the burner-side end plate can be reduced, whereby the distance between the resonator bores is increased and thus the voltages between the resonator bores are reduced.

Die Fertigung derartiger Stirnplatten ist mit elektrochemischem Abtragen (ECM), Funkenerodieren (EDM) und selektivem Laserschmelzen (SLM) möglich.The production of such end plates is possible with electrochemical erosion (ECM), spark erosion (EDM) and selective laser melting (SLM).

Die genannten Ausführungsformen der Erfindung führen sowohl einzeln als auch in Kombination zur Reduzierung von Spannungsspitzen und somit zu einer erhöhten Lebensdauer der Stirnplatte. Durch die Kühlung mit Kühlluft an den Stellen hoher Temperaturbelastung wärmt sich die Stirnplatte bei transienten Vorgängen gleichmäßiger auf und auch im stationären Betrieb erfolgt eine homogenere Temperaturverteilung. Dies führt bei gleichen thermischen Bedingungen zu geringeren Temperaturbelastungen. Somit ermöglichen sie eine signifikante Lebenszeitverlängerung der Stirnplatte bei gleichen thermischen Randbedingungen. Somit vergrößert sich der Regelbereich im Betrieb und es ergeben auch im Hinblick auf Werkstoffe und Beschichtungen kostengünstigere Alternativen.The mentioned embodiments of the invention lead, both individually and in combination, to the reduction of voltage peaks and thus to an increased service life of the end plate. By cooling with cooling air at the points of high temperature load, the face plate heats up evenly during transient processes and even in stationary operation, a more homogeneous temperature distribution. This leads to lower temperature loads under the same thermal conditions. Thus, they allow a significant lifetime extension of the face plate under the same thermal boundary conditions. Thus, the control range increases during operation and there are also cheaper alternatives with regard to materials and coatings.

Die Erfindung wird beispielhaft anhand der Zeichnungen näher erläutert. Es zeigen schematisch und nicht maßstäblich:

  • Figur 1 eine schematische Schnittansicht einer Brenneranordnung,
  • Figur 2 eine Stirnplatte mit axialen Bohrungen im Rand,
  • Figur 3 eine Detailansicht der Stirnplatte,
  • Figur 4 eine weitere Detailansicht der Stirnplatte,
  • Figur 5 eine Schnittansicht der Bohrungen in der Stirnplatte,
  • Figur 6 eine Stirnplatte mit länglichen Vertiefungen,
  • Figur 7 eine Darstellung der inneren Strukturen einer Stirnplatte,
  • Figur 8 eine Schnittansicht der länglichen Vertiefung und
  • Figur 9 eine Ansicht entlang der Achse der Vertiefung.
The invention will be explained in more detail by way of example with reference to the drawings. Shown schematically and not to scale:
  • FIG. 1 a schematic sectional view of a burner assembly,
  • FIG. 2 an end plate with axial holes in the edge,
  • FIG. 3 a detailed view of the face plate,
  • FIG. 4 another detail view of the face plate,
  • FIG. 5 a sectional view of the holes in the face plate,
  • FIG. 6 a face plate with elongated depressions,
  • FIG. 7 a representation of the internal structures of a face plate,
  • FIG. 8 a sectional view of the elongated recess and
  • FIG. 9 a view along the axis of the recess.

Die Figuren zeigen eine Brenneranordnung 1 gemäß einer Ausführungsform der vorliegenden Erfindung bzw. Komponenten derselben. Die Brenneranordnung 1 der Figur 1 umfasst eine Brennkammer 2, einen zentral angeordneten Pilotbrenner 23, eine Mischrohranordnung 24 mit einer Vielzahl von Mischrohren 6, welche Mischkanäle 3 bilden, die in die Brennkammer 2 münden, eine Vielzahl von Brennstoffinjektoren 25, die bis zu einer geeigneten Position in die Mischrohre 6 ragen, und eine Montageplatte 26, welche die Mischrohranordnung 24 aufnimmt und dazu dient, die Brenneranordnung 1 an einem nicht näher dargestellten Maschinengehäuse zu befestigen.The figures show a burner assembly 1 according to an embodiment of the present invention or components thereof. The burner assembly 1 of FIG. 1 comprises a combustion chamber 2, a centrally located pilot burner 23, a mixing tube assembly 24 having a plurality of mixing tubes 6 forming mixing channels 3 opening into the combustion chamber 2, a plurality of fuel injectors 25 protruding into the mixing tubes 6 to a suitable position , and a mounting plate 26 which receives the mixing tube assembly 24 and serves to fasten the burner assembly 1 to a machine housing, not shown.

Die Mischrohranordnung 24 umfasst eine rohrförmige Außenwand 8, eine radial von der Außenwand 8 beabstandet angeordnete rohrförmige Innenwand 9, eine stromaufwärts angeordnete ringförmige Stirnplatte 10 und eine stromabwärts angeordnete Stirnplatte 11, die einen Ringraum 7 definieren, durch den sich die Mischrohre 6 in axialer Richtung erstrecken. Die Stirnplatte 11 weist einen sowohl radial innen als auch radial außen sich in Richtung des Ringraums 7 erstreckenden umlaufenden Rand 13, 14 auf. Ferner umfasst die Mischrohranordnung 24 eine ringförmige Trennplatte 27.The mixing tube assembly 24 comprises a tubular outer wall 8, a tubular inner wall 9 spaced radially from the outer wall 8, an upstream annular end plate 10 and a downstream face plate 11 defining an annulus 7 through which the mixing tubes 6 extend in the axial direction , The end plate 11 has a both radially inward and radially outward in the direction of the annular space 7 extending peripheral edge 13, 14. Further, the mixing tube assembly 24 includes an annular partition plate 27.

Die stromaufwärts angeordnete Stirnplatte 10 umfasst eine Vielzahl von Durchgangsöffnungen 12, welche die Mischrohre 6 aufnehmen und/oder fortsetzen. Die Durchgangsöffnungen 12 definieren vorliegend zwei Lochkreise mit voneinander verschiedenen Lochkreisdurchmessern, wobei die Durchgangsöffnungen 12 des ersten Lochkreises und die Durchgangsöffnungen 12 des zweiten Lochkreises in radialer Richtung versetzt zueinander angeordnet sind. Ferner weist die Stirnplatte 10 eine Vielzahl von in der Figur 1 nicht gezeigten Luftkanälen auf, die sich in axialer Richtung erstrecken und über die Ringfläche der Stirnplatte 10 verteilt angeordnet sind.The upstream face plate 10 includes a plurality of through holes 12 which receive and / or continue the mixing tubes 6. In the present case, the passage openings 12 define two hole circles with mutually different pitch circle diameters, wherein the passage openings 12 of the first pitch circle and the passage openings 12 of the second pitch circle are arranged offset from one another in the radial direction. Further, the face plate 10 has a plurality of in the FIG. 1 Air ducts, not shown, which extend in the axial direction and are distributed over the annular surface of the end plate 10.

Die Trennplatte 27 ist analog zur Stirnplatte 10 mit Durchgangsöffnungen 28 versehen, die mit den Durchgangsöffnungen 12 der Stirnplatte 10 in axialer Richtung fluchten. Ferner ist die Trennplatte 27 mit einer Vielzahl von Spülluftkanälen 29 versehen, die verteilt über die Ringfläche der Trennplatte 27 angeordnet sind.The partition plate 27 is analogous to the end plate 10 is provided with through holes 28 which are aligned with the through holes 12 of the end plate 10 in the axial direction. Further, the partition plate 27 is provided with a plurality of scavenging air channels 29 distributed over the annular surface of the partition plate 27.

Die stromabwärts angeordnete Stirnplatte 11 umfasst analog zu der Stirnplatte 10 und der Trennplatte 27 Durchgangsöffnungen 12, die axial mit den Durchgangsöffnungen 12 der Stirnplatte 10 und den Durchgangsöffnungen 28 der Trennplatte 27 fluchten. Ferner sind in der Stirnplatte 11 sich axial erstreckende Luftkanäle 30 ausgebildet, die den Ringraum 7 mit der Brennkammer 2 strömungstechnisch verbinden.The downstream arranged face plate 11 comprises analogous to the end plate 10 and the partition plate 27 through holes 12 which are aligned axially with the through holes 12 of the end plate 10 and the through holes 28 of the partition plate 27. Further, in the face plate 11 are axially extending Air channels 30 are formed, which connect the annular space 7 with the combustion chamber 2 fluidly.

Im Betrieb strömen ein Brennstoff 5 und Verbrennungsluft 4 durch die Strahldüsen, d.h. die Mischrohre 6, und gelangen als Brennstoff-Luft-Gemisch in die Brennkammer 2.In operation, a fuel 5 and combustion air 4 flow through the jet nozzles, i. the mixing tubes 6, and arrive as a fuel-air mixture in the combustion chamber. 2

Figur 2 zeigt die stromabwärts angeordnete ringförmige Stirnplatte 11 mit Durchgangsöffnungen 12 und axialen Bohrungen 15 im Rand 13, 14 sowohl radial innen als auch radial außen. Die Bohrungen 15 erstrecken sich im Wesentlichen parallel zu einer Normalen der Stirnplatte 11 vom Ringraum 7 her in die Stirnplatte 11 hinein. FIG. 2 shows the downstream annular end plate 11 with through holes 12 and axial holes 15 in the edge 13, 14 both radially inward and radially outward. The bores 15 extend substantially parallel to a normal of the end plate 11 from the annular space 7 into the end plate 11.

In Figur 3 ist zu sehen, dass mindestens eine von der axialen Bohrung 15 abzweigende Öffnung 16 zur Abfuhr von Kühlluft 17 vorgesehen ist.In FIG. 3 It can be seen that at least one opening 16 branching off from the axial bore 15 is provided for the removal of cooling air 17.

In Figur 4 ist zu sehen, wie mehrere Bohrungen 15 in die Kammer 18 münden. Figur 5 zeigt dasselbe noch einmal unter einem anderen Winkel und im Schnitt. Die Kammern 18 oder auch Kühllufttaschen können aus einer Kombination aus Bohrungen und Ausfräsungen bestehen oder durch andere Fertigungsverfahren hergestellt werden. Insbesondere die Platzierung an den Stellen hoher Temperatur an der inneren Zylinderfläche und der äußeren Zylinderfläche der Stirnplatte führen zu einer besseren Temperaturverteilung und somit geringeren temperaturinduzierten Spannungen.In FIG. 4 It can be seen how several holes 15 open into the chamber 18. FIG. 5 shows it again at a different angle and in section. The chambers 18 or cooling air pockets may consist of a combination of holes and cutouts or be made by other manufacturing processes. In particular, the placement at the points of high temperature on the inner cylindrical surface and the outer cylindrical surface of the face plate lead to a better temperature distribution and thus lower temperature-induced stresses.

Figur 6 zeigt eine Ausführungsform der Erfindung mit länglichen Vertiefungen 19, die sich von der Brennkammer 2 aus stromaufwärts im Rand 13 der Stirnplatte 11 erstrecken. Die Vertiefungen sind radial innen im inneren Rand 13 angeordnet. Ihre Länge ist kleiner als die Höhe des Randes 13. FIG. 6 shows an embodiment of the invention with elongated recesses 19 which extend from the combustion chamber 2 upstream in the edge 13 of the end plate 11. The depressions are arranged radially inward in the inner edge 13. Its length is smaller than the height of the edge 13th

In Figur 7 sind die Strukturen im Inneren des Rands 13 der Stirnplatte 11 gezeigt. Im Ausführungsbeispiel sind je zwei Bohrungen 15 einer Vertiefung 19 zugeordnet. Die Bohrungen 15 weisen Öffnungen 16 zur Abfuhr von Kühlluft 17 auf. Diese Kühlluft 17 strömt durch Kanäle 31 zur Vertiefung 19. Die Öffnungen 16 bzw. die Kanäle 31 sind so angeordnet, dass gegenüberliegende Seiten 21 der Vertiefung 19 durch Prallkühlung gekühlt werden können. Figur 7 zeigt auch, dass der Grund 20 der Vertiefung 19 ein Querschnittsprofil aus der Menge Kreis, Oval, Ellipse aufweist. Ferner ist in der Figur 7 zu sehen, dass in der Vertiefung 19 weitere Öffnungen 22 in Richtung des Ringraums 7 angeordnet sind.In FIG. 7 the structures inside the rim 13 of the end plate 11 are shown. In the exemplary embodiment, two holes 15 are assigned to a recess 19. The holes 15 have openings 16 for the removal of cooling air 17. This cooling air 17 flows through channels 31 to the recess 19. The openings 16 and the channels 31 are arranged so that opposite sides 21 of the recess 19 can be cooled by impingement cooling. FIG. 7 also shows that the base 20 of the recess 19 has a cross-sectional profile of the set circle, oval, ellipse. Furthermore, in the FIG. 7 to see that 19 further openings 22 are arranged in the direction of the annular space 7 in the recess.

Figur 8 zeigt eine Ansicht desselben Ausführungsbeispiels mit Schnitt durch eine Vertiefung 19. Darin erkennt man den runden Grund 20 der Vertiefung 19 sowie die Kanäle 31, die von den Öffnungen 16 der Bohrungen 15 kommend in die Vertiefung 19 münden, sowie weiteren Öffnungen 22, welche von den Vertiefungen 19 ausgehend in den Ringraum 7 münden. FIG. 8 shows a view of the same embodiment with a section through a recess 19. It can be seen the round base 20 of the recess 19 and the channels 31, coming from the openings 16 of the holes 15 coming into the recess 19, and other openings 22, which of the Recesses 19, starting in the annular space 7 open.

Figur 9 zeigt den Blick von der Brennkammerseite auf den Rand 13 in eine Vertiefung entlang ihrer Längsachse. Man erkennt die Auslässe der Kanäle 31. FIG. 9 shows the view from the combustion chamber side on the edge 13 in a recess along its longitudinal axis. One recognizes the outlets of the channels 31.

Obwohl die Erfindung im Detail durch das bevorzugte Ausführungsbeispiel näher illustriert und beschrieben wurde, so ist die Erfindung nicht durch die offenbarten Beispiele eingeschränkt und andere Variationen können vom Fachmann hieraus abgeleitet werden, ohne den Schutzumfang der Erfindung zu verlassen.Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims (10)

  1. Burner assembly (1) with a combustion chamber (2), multiple mixing ducts (3) opening into the combustion chamber (2) and in which during normal operation introduced combustion air (4) and introduced fuel (5) are mixed, wherein the mixing ducts (3) are formed by mixing tubes (6) which extend axially through an annular space (7) which is defined between a tubular external wall (8), a tubular internal wall (9) arranged so that is spaced apart radially from the external wall (8), an annular end plate (10) arranged upstream, and an annular end plate (11) arranged downstream, wherein the end plates (10, 11) are provided with through openings (12) which receive and/or continue the mixing tubes (6) and have, both radially inward and radially outward, a circumferential edge (13, 14) which extends in the direction of the annular space (7), wherein axial bores (15) are provided in the edge (13, 14) of the annular end plate (11) arranged downstream which extend essentially parallel to a perpendicular to the end plate (11), away from the annular space (7) and into the end plate (11), characterized in that at least one opening (16) branching off from the axial bore (15) is provided for the removal of cooling air (17).
  2. Burner assembly (1) according to Claim 1, wherein the at least one opening (16) opens into a chamber (18) which is open toward the annular space (7).
  3. Burner assembly (1) according to Claim 2, wherein multiple bores (15) open into the chamber (18).
  4. Burner assembly (1) according to one of the preceding claims, wherein the bores (15) are arranged in both the radially outer and radially inner edge (14, 13) of the end plate (11).
  5. Burner assembly (1) according to Claim 1, wherein the opening (16) opens into an elongated depression (19) which extends from the combustion chamber (2) upstream in the edge (13) of the end plate (11).
  6. Burner assembly (1) according to Claim 5, wherein the depression (19) is arranged radially inward in the inner edge (13).
  7. Burner assembly (1) according to one of Claims 5 or 6, wherein the length of the depression (19) is less than the height of the edge (13).
  8. Burner assembly (1) according to one of Claims 5 to 7, wherein the base (20) of the depression (19) has a cross-sectional profile which is a circle, an oval, or an ellipse.
  9. Burner assembly (1) according to one of Claims 5 to 8, wherein at least one opening (16) of two bores (15) opens into a depression (19) in such a way that opposite sides (21) of the depression (19) can be cooled by impingement cooling.
  10. Burner assembly (1) according to one of Claims 5 to 9, wherein further openings (22) are arranged in the depression (19) in the direction of the annular space (7) .
EP15788377.8A 2014-11-03 2015-10-29 Burner assembly Active EP3134682B1 (en)

Applications Claiming Priority (2)

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DE102014222402 2014-11-03
PCT/EP2015/075053 WO2016071186A1 (en) 2014-11-03 2015-10-29 Burner assembly

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EP3134682A1 EP3134682A1 (en) 2017-03-01
EP3134682B1 true EP3134682B1 (en) 2018-08-22

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US (1) US10578305B2 (en)
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CN (1) CN106461226B (en)
RU (1) RU2656177C1 (en)
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WO2016071186A1 (en) 2016-05-12
RU2656177C1 (en) 2018-05-31
CN106461226A (en) 2017-02-22
US10578305B2 (en) 2020-03-03
CN106461226B (en) 2019-06-28
EP3134682A1 (en) 2017-03-01
US20170227223A1 (en) 2017-08-10

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