EP2264370A1 - Burner assembly for a firing assembly for firing fluid fuels and method for operating such a burner assembly - Google Patents

Burner assembly for a firing assembly for firing fluid fuels and method for operating such a burner assembly Download PDF

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Publication number
EP2264370A1
EP2264370A1 EP09162827A EP09162827A EP2264370A1 EP 2264370 A1 EP2264370 A1 EP 2264370A1 EP 09162827 A EP09162827 A EP 09162827A EP 09162827 A EP09162827 A EP 09162827A EP 2264370 A1 EP2264370 A1 EP 2264370A1
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EP
European Patent Office
Prior art keywords
flow
burner
fuel
flow divider
supply channel
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
EP09162827A
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German (de)
French (fr)
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EP2264370B1 (en
Inventor
Andreas Böttcher
Tobias Krieger
Ulrich Wörz
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Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP09162827A priority Critical patent/EP2264370B1/en
Priority to CN201010202904.4A priority patent/CN101922714B/en
Priority to US12/814,707 priority patent/US20100316966A1/en
Priority to RU2010124411/06A priority patent/RU2531714C2/en
Publication of EP2264370A1 publication Critical patent/EP2264370A1/en
Application granted granted Critical
Publication of EP2264370B1 publication Critical patent/EP2264370B1/en
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    • 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
    • F23R3/34—Feeding into different combustion zones
    • F23R3/343—Pilot flames, i.e. fuel nozzles or injectors using only a very small proportion of the total fuel to insure continuous combustion
    • 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

Definitions

  • the invention relates to a burner arrangement for a firing system for the combustion of fluid fuels and method for operating such a burner arrangement with the features mentioned in the preambles of the respective independent claims.
  • burners have been developed in recent years that have particularly low emissions of nitrogen oxides (NOx). It is often emphasized that such burners are not only with a fuel, but possibly with different fuels, such as oil, natural gas and / or coal gas optionally or in combination operable to increase the security of supply and flexibility of operation. Such burners are for example in the EP 0 276 696 B1 described.
  • the burner consists of a central pilot burner system which is operable with gas and / or oil as a so-called diffusion burner or separate premix burner.
  • the pilot burner system is surrounded by a main burner system having an air supply annular channel system with therein a swirl blading with a plurality of blades for pre-mixing with gas.
  • in the main burner system there are inlet nozzles for oil in the area of the swirl blading, which allow premixing of the main air flow with oil.
  • a challenge in these burners are the resulting by an uneven thermal distribution mechanical stresses in the walls of the metallic housing, the so-called hub in which the Zubigringkanäle the gas and oil fuels are arranged relatively close together, represents a gas ring space feeds the main burner relative to the flow direction of the incoming air upstream of the so-called swirl vanes, which impart a mixing swirl to the air flow with the fuel gas, or through the swirl vanes therethrough.
  • an oil supply is present, which is usually located closer to the burner outlet, as the gas supply. It comprises an oil annulus and a leading to the annulus oil supply channel, which is located in the located between the gas annulus and the pilot burner hub wall.
  • gas Since gas has a lower density compared to oil, it requires a larger cross-section, whereby the dimensioning of the gas supply is much greater than the oil supply. Therefore, the part of the burner hub with the gas supply to a larger air duct facing outer surface than the oil supply.
  • the air supply is done with pre-compressed air that has passed through a compressor, whereby this supplied air due to the compression has a temperature that already reaches over 400 ° C. Consequently, the area of the burner hub with the gas supply is heated rapidly to a temperature in the range of over 400 ° C and remains at this operating temperature.
  • Oil supply channel further away from the hot air supply channel so that the oil in the oil supply channel hardly undergoes heating and therefore only has a temperature of about 50 ° C.
  • the wall between the gas annulus and the oil supply passage is subject to a large temperature gradient both in continuous operation and when flushing the burner hub. Namely, if the hub, i. the oil duct is flushed with water, so the gas ducts are hot and the oil duct cools down. Due to the limited space in the hub, the channels are close together and there are high temperature / heat gradients. As a result of the temperature gradient arise thermal stresses, which shorten the life of such burner hubs greatly.
  • the present invention therefore has as its object to reduce the described thermal stresses in the burner hub during operation and when flushing the hub of the burner assembly.
  • a burner arrangement according to the invention for a firing system for the firing of fluid fuels comprises a burner hub, at least one air supply channel and, for each type of fuel, at least one fuel supply channel.
  • the at least one fuel supply channel is at least partially formed in the burner hub, so that the material of the burner hub forms a wall of the fuel supply channel.
  • a flow divider is provided in at least one fuel supply channel, which is spaced from the wall of the fuel supply channel, so that between the Wall of the fuel supply channel and the flow divider belonging to the flow path of the fuel flowing through the fuel supply passage space is formed.
  • the intermediate space forms a region belonging to the flow path in which an adjustable continuous flow of fuel flows.
  • This fuel flow prevents the formation of deposits in the space and thus clogging of the nozzles through which the fuel exits.
  • the flow in this area decouples the hot structure from the cold and thus provides heat protection. Due to the reduced heat transfer, the thermally induced stresses are reduced in comparison to burner arrangements without flow splitters.
  • the flow divider consists of a flow medium, in particular a pipe with a flow opening, and a disk with a corresponding flow opening.
  • a central bore in the middle of the flow divider is provided as the flow opening. Through this central bore of the main part of the fuel flows.
  • the disc is seen in the flow direction at the first coming end of the flow means provided.
  • the disc is larger in diameter than the diameter of the flow medium.
  • the disk can be clamped in the wall of the fuel supply channel.
  • positioning means e.g. a positioning projection may be provided on the wall of the fuel supply channel.
  • the flow divider in the disc at least one bore.
  • the disc has a plurality of bores, which are distributed substantially uniformly over the circumference. Through these holes, a small part of the preferably passes cold fuel flow into the gap, wherein the hot support structure is thus thermally decoupled from the incoming cold fuel. Thus, the heat transfer in this area is reduced.
  • said object is achieved by a method of operating such a burner assembly, wherein in operation, fuel is passed through the fuel supply passage, with the majority of the fuel flowing through the passage opening of the flow divider, and a minor portion of the fuel the space of the flow divider flows, thus deposits in the space are largely prevented.
  • the main flow for supplying the nozzles flows through the passage opening of the flow divider, this passage opening is preferably provided as a large, central bore in the middle of the flow divider. High temperatures and voltage gradients are therefore no longer formed. As a desired consequence, the life is significantly increased.
  • FIG. 1 shows a burner assembly 20 according to the prior art, which may optionally be used in conjunction with a plurality of similar arrangements, for example in the combustion chamber of a gas turbine plant.
  • the pilot burner system consists of an inner part, the pilot burner system and a concentric outer part, the main burner system. Both systems are suitable for operation with gaseous and / or liquid fuels in any combination.
  • the pilot burner system consists of a central oil supply 1 (medium G) and an inner gas supply channel 2 (medium F) arranged concentrically around it. This in turn is surrounded by a concentric about the axis of the burner arranged inner air supply channel 3 (Medium E).
  • a suitable ignition system may be arranged, for which many possible embodiments are known and its representation has therefore been omitted here.
  • the central oil feed 1 has at its end an oil nozzle 5 and the inner air supply channel 3 has a swirl blading 6 in its end region.
  • a pilot burner system 1, 2, 3, 5, 6 can be operated in a manner known per se, ie predominantly as a diffusion burner. Its task is to maintain the main burner in a stable burning operation, since this is usually operated with a tendency to instability lean mixture.
  • the main burner system has a concentric with the pilot burner system arranged and obliquely on this incoming outer air supply annular duct system 4.
  • This air supply annular channel system 4 is also provided with a swirl blading 7.
  • the swirl blading 7 consists of hollow blades with outlet nozzles 11 in the flow cross-section of the air supply annular channel system 4 (medium A). These are fed from a supply line 8 and an annular channel 9 through openings 10 for the medium B.
  • the burner has a feed line 12 for a medium C, preferably oil, which opens into an annular channel 13, which has outlet nozzles 14 for the medium C in the region or below the swirl blading 7.
  • the burner additionally has a further coal gas feed channel 16 for medium D. This opens just above the swirl blading 7 with the outlet nozzles 11 in the outer air supply ring channel system 4, on the inside, so that both together form a diffusion burner in principle.
  • FIG. 2 shows an enlarged partial cross-sectional view through a known burner hub 18 according to the prior art.
  • the burner assembly is circular, so you have to imagine the annular channel 9 and 13 as a circle.
  • the swirl blades 7 have only one supply channel with the outlet nozzles 11, which are preferably provided for injecting a gaseous medium B. Below thereof in the flow direction, an outlet nozzle 14 is provided for injecting preferably liquid medium C. There is a plurality of outlet nozzles 14 arranged along the circular ring channel 13, so that the injection of the medium C can be carried out evenly in the likewise encircling burner chamber.
  • FIG. 3 shows a schematic diagram of a swirl blade 7 with two integrated, independently controllable gas levels B and D.
  • the swirl blade 7 has two independent supply channels 11 and 21.
  • the one feed channel with the outlet nozzles 11 can be used, for example, for injecting the medium D and the second feed channel 21 via the outlet nozzles 24 for injecting the medium B.
  • both be injected through the supply channels of the swirl vane 7 media gaseous, z.
  • an inert material such as water vapor can be injected via these outlet nozzles 11 and / or 21 if necessary.
  • FIG. 4 shows a fuel hub 18 with the supply channel 16, the annular channels 9 and 13 and openings 10, which leads the fuel into the blade 7.
  • FIG. 5 shows a fuel hub 18 according to the invention with flow divider 40.
  • the flow divider 40 (FIG. FIG. 6 ) consists of a tube 45 with passage opening 55 (hereinafter referred to as tube opening 55).
  • a disc 42 is seen on the tube in the flow direction at the first coming end of the tube 45 is mounted.
  • the disc 42 also has a tube opening 55 which coincides with the tube opening 55.
  • the diameter of the disc 42 is greater than the diameter of the tube 45. This forms between the wall 21 and the tube 45, a gap 38 in the flow direction.
  • the flow divider almost the shape of a double tube namely the tube 45 and the wall 21, which is also here tubular, on.
  • the disk 42 may be substantially positively mounted in the wall 21, for example, clamped.
  • a positioning projection 35 is possible, on which the disc 42 rests. Holes 50 are mounted in the disc 42. Preferably, these holes 50 are evenly distributed over the circumference. By the mounted in the disc 42 above holes in the flow divider 40, a fluid flow is divided. An adjustable small portion of the flow is directed through these smaller holes 50 into the gap 38. This fluid flow thus prevents the formation of deposits in the intermediate space 38 and clogging of the nozzles 14. Due to the low current is also given a function as a heat protection tube. In addition, the lowered flow in this area decouples the hot structure from the cold and thus provides heat protection. The hot support structure is thus thermally decoupled from the incoming fuel, preferably cold oil.
  • the main flow for supplying the nozzles 14 continues to flow through the pipe opening 55.
  • This is preferably realized as a central bore in the middle of the flow divider 40. Due to the flow divider 42 and a low flow of the fuel in the intermediate space 38, the heat transfer ⁇ in the intermediate space is substantially lower than the heat transfer ⁇ previously without flow divider at the same location; it therefore holds ⁇ ⁇ ⁇ before .
  • the main flow to supply the nozzle 14 continues to flow through the central bore, that is through the pipe opening 55.
  • the heat transfer ⁇ has remained substantially unchanged, ie, ⁇ ⁇ ⁇ before .
  • the function of the flow divider 40 is thus given as a heat shield and the hot support structure is decoupled from the incoming cold oil. High temperature and voltage gradients are therefore no longer formed. The life of the combustion chamber hub 18 is thus substantially increased.
  • the flow divider 40 thus divides the fluid flow into a small flow which flows through the intermediate space 38 and a quantitative main flow flowing through the tube opening 55.
  • the flow divider 40 thus prevents deposits and clogging of nozzles when using liquid fuels.
  • the lowered flow decouples the hot structure from the cold and thus provides heat protection.
  • high thermal gradients and resulting thermal stresses are prevented over a small cross section.
  • the flow divider 40 thus the component 18 can fulfill a high required life.
  • the flow divider 40 is easy to manufacture and easy to adapt to existing combustor hubs 18.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Gas Burners (AREA)

Abstract

The arrangement has a fuel supply channel i.e. oil channel, for fuel e.g. heavy oil, where the fuel supply channel is partially embodied in a burner hub. A flow divider (40) is arranged in the fuel supply channel, where the flow divider is distanced from a wall (21) of the fuel supply channel such that an interspace (38) associated with a flow path of the fuel e.g. oil, flowing through the fuel supply channel is formed between the wall and the flow divider, where the flow divider is formed by a sleeve introduced into the fuel supply channel. An independent claim is also included for a method for operating a burner arrangement.

Description

Die Erfindung betrifft eine Brenneranordnung für eine Verfeuerungsanlage zum Verfeuern fluidischer Brennstoffe und Verfahren zum Betrieb einer solchen Brenneranordnung mit den in den Oberbegriffen der jeweiligen unabhängigen Ansprüche genannten Merkmalen.The invention relates to a burner arrangement for a firing system for the combustion of fluid fuels and method for operating such a burner arrangement with the features mentioned in the preambles of the respective independent claims.

Im Hinblick auf die weltweiten Bemühungen zur Senkung des Schadstoffausstoßes von Befeuerungsanlagen, insbesondere bei Gasturbinen, wurden in den letzten Jahren Brenner entwickelt, die besonders geringe Ausstöße an Stickoxiden (NOx) aufweisen. Dabei wird vielfach Wert darauf gelegt, dass solche Brenner jeweils nicht nur mit einem Brennstoff, sondern möglichst mit verschiedenen Brennstoffen, beispielsweise Öl, Erdgas und/oder Kohlegas wahlweise oder in Kombination betreibbar sind, um die Versorgungssicherheit und Flexibilität des Betriebs zu erhöhen. Solche Brenner sind beispielsweise in der EP 0 276 696 B1 beschrieben.In view of the global efforts to reduce pollutant emissions from firing systems, particularly in gas turbines, burners have been developed in recent years that have particularly low emissions of nitrogen oxides (NOx). It is often emphasized that such burners are not only with a fuel, but possibly with different fuels, such as oil, natural gas and / or coal gas optionally or in combination operable to increase the security of supply and flexibility of operation. Such burners are for example in the EP 0 276 696 B1 described.

Ein Problem bei der Auslegung von Brennern für alle möglichen verschiedenen Betriebsbedingungen und Betriebsstoffe besteht darin, dass die beim Betrieb jeweils benötigten Volumina der einzelnen Betriebsstoffe verschieden sind, sodass es Schwierigkeiten macht, für alle Betriebsstoffe das gleiche Zuführungssystem und die gleichen Eindüsungsöffnungen zu verwenden. Daher ist es im Stand der Technik bekannt, für flüssige und gasförmige Medien verschiedene Zuführungssysteme zu verwenden.A problem in the design of burners for all sorts of different operating conditions and supplies is that the volumes of the individual consumables required during operation are different so that it is difficult to use the same feed system and the same injection orifices for all supplies. Therefore, it is known in the art to use different delivery systems for liquid and gaseous media.

Ein weiteres Problem stellt sich aber auch dann, wenn wahlweise gasförmige Brennstoffe mit völlig verschiedenen spezifischen Brennwerten, beispielsweise Erdgas und Kohlegas, eingesetzt werden sollen. Die verschiedenen relativen Volumenverhältnisse bei Verwendung dieser beiden Brennstoffe und die unterschiedlichen chemischen Vorgänge bei deren Verbrennung erfordern eine Modifizierung oder Erweiterung der bekannten Systeme.Another problem arises, however, if either gaseous fuels with completely different specific calorific values, such as natural gas and coal gas to be used. The different relative volume ratios When using these two fuels and the different chemical processes in their combustion require a modification or extension of the known systems.

Es ist bekannt, dass zur Reduzierung des Schadstoffausstoßes in bestimmten Betriebszuständen zusätzlich Inertstoffe, insbesondere Wasser oder Wasserdampf eingedüst werden, wodurch die Verbrennungstemperatur gesenkt und folglich der Schadstoffausstoß an NOx verringert wird. Aus der WO 89/08803 Al ist es weiterhin bekannt, dass z. B. bei Verwendung der Schweröle als Brennstoff dem Eingedüsten noch Zusatzstoffe beigemischt werden sollen, um Schäden an den Bauteilen einer nachfolgenden Gasturbine zu vermeiden.It is known that in order to reduce pollutant emissions in certain operating conditions additionally inert materials, in particular water or steam are injected, whereby the combustion temperature is lowered and consequently the pollutant emissions of NOx is reduced. From the WO 89/08803 Al it is also known that z. B. in the use of heavy oils as fuel to the injected still additives should be added to prevent damage to the components of a subsequent gas turbine.

Aus der EP 0 276 696 B1 ist ein Hybridbrenner für Vormischbetrieb mit Gas und/oder Öl bekannt, wie er insbesondere für Gasturbinenanlagen angewendet wird. Der Brenner besteht aus einem zentralen Pilotbrennersystem, welches mit Gas und/oder Öl als ein sogenannter Diffusionsbrenner oder gesonderter Vormischbrenner betreibbar ist. Zusätzlich ist die Möglichkeit zur Einspeisung von Inertstoffen vorgesehen. Das Pilotbrennersystem ist von einem Hauptbrennersystem umgeben, welches ein Luft-Zufuhr-Ringkanalsystem mit einer darin befindlichen Drallbeschaufelung mit einer Mehrzahl von Schaufeln für den Vormischbetrieb mit Gas aufweist. Zusätzlich sind im Hauptbrennersystem Einlassdüsen für Öl im Bereich der Drallbeschaufelung vorhanden, die eine Vormischung des Hauptluftstroms mit Öl ermöglichen.From the EP 0 276 696 B1 a hybrid burner for Vormischbetrieb with gas and / or oil is known, as it is used in particular for gas turbine plants. The burner consists of a central pilot burner system which is operable with gas and / or oil as a so-called diffusion burner or separate premix burner. In addition, the possibility for feeding in inert materials is provided. The pilot burner system is surrounded by a main burner system having an air supply annular channel system with therein a swirl blading with a plurality of blades for pre-mixing with gas. In addition, in the main burner system there are inlet nozzles for oil in the area of the swirl blading, which allow premixing of the main air flow with oil.

Den zur vorliegenden Erfindung nächsten Stand der Technik beschreiben die DE 42 12 810 B4 und die aus ihr hervorgegangene EP 0 580 683 B1 . Hierbei wird vorausgesetzt, dass bei der Verbrennung von Brenngas mit niedrigem Brennwert keine besonderen Maßnahmen zur Senkung des Schadstoffausstoßes erforderlich sind, da bei Verbrennung solcher Gase keine sehr hohen Flammentemperaturen auftreten und damit die Bildung von NOx praktisch unbedeutend bleibt. Es genügte daher, ein weiteres einfaches Zufuhrsystem zu schaffen, wobei jedoch darauf geachtet werden muss, dass dieses System die anderen Systeme nicht nachteilig beeinflusst und auch nicht bei Betrieb der anderen Systeme die Betriebssicherheit verringert. Deshalb ist es wichtig, dass der weitere Ringkanal zuströmseitig oberhalb der Auslassdüsen für die anderen Brennstoffe mündet. Auf diese Weise kann kein zündfähiges Gemisch in den weiteren Ringkanal gelangen, wenn der Brenner durch die Auslassdüsen mit Brennstoff anderer Art versorgt wird.The closest prior art to the present invention describe the DE 42 12 810 B4 and the things that came out of it EP 0 580 683 B1 , It is assumed that the combustion of fuel gas with a low calorific value no special measures to reduce pollutant emissions are required because when combustion of such gases no very high flame temperatures occur and thus the formation of NOx remains virtually insignificant. It was enough, therefore, another However, care must be taken to ensure that this system does not adversely affect the other systems and does not reduce the reliability of operation of the other systems. Therefore, it is important that the further annular channel opens on the upstream side above the outlet nozzles for the other fuels. In this way, no ignitable mixture can get into the other annular channel when the burner is supplied by the outlet nozzles with other fuel.

Eine Herausforderung bei diesen Brennern stellen die durch eine ungleichmäßige thermische Verteilung entstehenden mechanischen Spannungen in den Wandungen des metallischen Gehäuses, der sogenannten Nabe, in der die Zufuhrringkanäle der Gas- und Öl-Energieträger relativ eng nebeneinander angeordnet sind, dar. Ein Gasringraum speist den Hauptbrenner bezogen auf die Strömungsrichtung der zuströmenden Luft eingangsseitig stromauf der sogenannten Drallschaufeln, die dem Luftstrom mit dem Brenngas einen vermischenden Drall vermitteln, oder durch die Drallschaufeln hindurch. Weiterhin ist eine Ölzufuhr vorhanden, die in der Regel näher am Brennerausgang angeordnet ist, als die Gaszufuhr. Sie umfasst einen Ölringraum sowie einen zum Ringraum führenden Ölzufuhrkanal, der in der zwischen dem Gasringraum und dem Pilotbrenner befindlichen Nabenwand angeordnet ist.A challenge in these burners are the resulting by an uneven thermal distribution mechanical stresses in the walls of the metallic housing, the so-called hub in which the Zufuhrringkanäle the gas and oil fuels are arranged relatively close together, represents a gas ring space feeds the main burner relative to the flow direction of the incoming air upstream of the so-called swirl vanes, which impart a mixing swirl to the air flow with the fuel gas, or through the swirl vanes therethrough. Furthermore, an oil supply is present, which is usually located closer to the burner outlet, as the gas supply. It comprises an oil annulus and a leading to the annulus oil supply channel, which is located in the located between the gas annulus and the pilot burner hub wall.

Da Gas gegenüber Öl eine geringere Dichte aufweist, beansprucht es einen größeren Querschnitt, wodurch die Dimensionierung der Gaszufuhr wesentlich größer ausfällt als der Ölzufuhr. Daher weist der Teil der Brenner-Nabe mit der Gaszufuhr eine größere zum Luftkanal gewandte Außenfläche auf als die Ölzufuhr. Die Luftzufuhr erfolgt mit vorverdichteter Luft, die einen Verdichter passiert hat, wodurch diese zugeführte Luft aufgrund der Komprimierung eine Temperatur aufweist, die bereits über 400°C erreicht. Folglich wird der Bereich der Brenner-Nabe mit der Gaszufuhr schnell auf eine Temperatur im Bereich von über 400°C aufgeheizt und bleibt bei dieser Betriebstemperatur. Der zum Ölringraum führendeSince gas has a lower density compared to oil, it requires a larger cross-section, whereby the dimensioning of the gas supply is much greater than the oil supply. Therefore, the part of the burner hub with the gas supply to a larger air duct facing outer surface than the oil supply. The air supply is done with pre-compressed air that has passed through a compressor, whereby this supplied air due to the compression has a temperature that already reaches over 400 ° C. Consequently, the area of the burner hub with the gas supply is heated rapidly to a temperature in the range of over 400 ° C and remains at this operating temperature. The leading to the oil annulus

Ölzufuhrkanal ist dagegen weiter von dem heißen Luftzufuhrkanal entfernt sodass das Öl im Ölzufuhrkanal kaum eine Erwärmung erfährt und daher lediglich eine Temperatur von etwa 50°C aufweist.Oil supply channel, however, further away from the hot air supply channel so that the oil in the oil supply channel hardly undergoes heating and therefore only has a temperature of about 50 ° C.

Da einerseits die Brenner-Nabe eine starke Aufheizung im Bereich der Gasringraums erfährt und andererseits der benachbarte Ölzufuhrkanal deutlich kühler ist, unterliegt die Wand zwischen der Gasringraum und dem Ölzufuhrkanal einem großen Temperaturgradienten sowohl im kontinuierlichen Betrieb als auch beim Spülen der Brenner-Nabe. Wird nämlich die Nabe, d.h. der Ölkanal mit Wasser gespült so beleiben die Gaskanäle heiß und der Ölkanal kühlt stark ab. Durch den begrenzten Platz in der Nabe liegen die Kanäle enge beieinander und es entstehen hohe Temperatur/Wärmegradienten. Infolge des Temperaturgradienten entstehen thermische Spannungen, welche die Lebensdauer derartiger Brenner-Naben stark verkürzen.Since on the one hand experiences the burner hub a strong heating in the gas annulus and on the other hand, the adjacent oil supply passage is much cooler, the wall between the gas annulus and the oil supply passage is subject to a large temperature gradient both in continuous operation and when flushing the burner hub. Namely, if the hub, i. the oil duct is flushed with water, so the gas ducts are hot and the oil duct cools down. Due to the limited space in the hub, the channels are close together and there are high temperature / heat gradients. As a result of the temperature gradient arise thermal stresses, which shorten the life of such burner hubs greatly.

Die vorliegende Erfindung macht es sich daher zur Aufgabe, die beschriebenen thermisch bedingten Spannungen in der Brenner-Nabe bei Betrieb und beim Spülen der Nabe der Brenneranordnung herabzusetzen.The present invention therefore has as its object to reduce the described thermal stresses in the burner hub during operation and when flushing the hub of the burner assembly.

Diese Aufgabe wird durch eine Brenneranordnung nach Anspruch 1 bzw. ein Verfahren zum Betrieb einer solchen Brenneranordnung gemäß Anspruch 10 gelöst. Die abhängigen Ansprüche enthalten vorteilhafte Ausgestaltungen der Erfindung.This object is achieved by a burner assembly according to claim 1 and a method for operating such a burner assembly according to claim 10. The dependent claims contain advantageous embodiments of the invention.

Eine erfindungsgemäße Brenneranordnung für eine Verfeuerungsanlage zum Verfeuern fluidischer Brennstoffe umfasst eine Brenner-Nabe, wenigstens einen Luftzufuhrkanal und für jede Brennstoffart wenigstens einen Brennstoffzufuhrkanal. Der wenigstens eine Brennstoffzufuhrkanal ist zumindest teilweise in der Brenner-Nabe ausgebildet, so dass das Material der Brenner-Nabe eine Wandung des Brennstoffzufuhrkanals bildet. Erfindungsgemäß ist in wenigstens einem Brennstoffzufuhrkanal ein Strömungsteiler vorgesehen, der von der Wandung des Brennstoffzufuhrkanals beabstandet ist, so dass zwischen der Wandung des Brennstoffzufuhrkanals und dem Strömungsteiler ein zum Strömungspfad des durch den Brennstoffzufuhrkanal strömenden Brennstoffes gehörender Zwischenraum gebildet ist.A burner arrangement according to the invention for a firing system for the firing of fluid fuels comprises a burner hub, at least one air supply channel and, for each type of fuel, at least one fuel supply channel. The at least one fuel supply channel is at least partially formed in the burner hub, so that the material of the burner hub forms a wall of the fuel supply channel. According to the invention, a flow divider is provided in at least one fuel supply channel, which is spaced from the wall of the fuel supply channel, so that between the Wall of the fuel supply channel and the flow divider belonging to the flow path of the fuel flowing through the fuel supply passage space is formed.

In der erfindungsgemäßen Brenneranordnung bildet der Zwischenraum einen zum Strömungspfad gehörenden Bereich, in dem ein einstellbarer kontinuierlicher Brennstofffluss strömt. Dieser Brennstofffluss verhindert die Bildung von Ablagerungen im Zwischenraum und somit ein Verstopfen der Düsen durch den der Brennstoff austritt. Zusätzlich entkoppelt die Strömung in diesem Bereich die heiße Struktur von der kalten und stellt somit einen Hitzeschutz dar. Aufgrund des verringerten Wärmeübergangs vermindern sich die thermisch bedingten Spannungen im Vergleich zu Brenneranordnungen ohne Strömungsteiler.In the burner assembly according to the invention, the intermediate space forms a region belonging to the flow path in which an adjustable continuous flow of fuel flows. This fuel flow prevents the formation of deposits in the space and thus clogging of the nozzles through which the fuel exits. In addition, the flow in this area decouples the hot structure from the cold and thus provides heat protection. Due to the reduced heat transfer, the thermally induced stresses are reduced in comparison to burner arrangements without flow splitters.

In der erfindungsgemäßen Brenneranordnung besteht der Strömungsteiler aus einem Durchflussmittel, insbesondere einem Rohr mit einer Durchflussöffnung, sowie einer Scheibe mit korrespondierender Durchflussöffnung. Bevorzugt ist als Durchflussöffnung eine zentrale Bohrung in der Mitte des Strömungsteilers vorgesehen. Durch diese zentrale Bohrung fließt der Hauptteil des Brennstoffs.In the burner arrangement according to the invention, the flow divider consists of a flow medium, in particular a pipe with a flow opening, and a disk with a corresponding flow opening. Preferably, a central bore in the middle of the flow divider is provided as the flow opening. Through this central bore of the main part of the fuel flows.

Ferner ist die Scheibe in Strömungsrichtung gesehen am zuerst kommenden Ende am Durchflussmittel vorgesehen.Further, the disc is seen in the flow direction at the first coming end of the flow means provided.

In bevorzugter Ausgestaltung ist die Scheibe in ihrem Durchmesser größer als der Durchmesser des Durchflussmittels. Die Scheibe kann dabei in die Wandung des Brennstoffzufuhrkanals geklemmt sein. Es können aber auch Positioniermittel z.B. ein Positionier-Vorsprung an der Wandung des Brennstoffzufuhrkanals vorgesehen sein.In a preferred embodiment, the disc is larger in diameter than the diameter of the flow medium. The disk can be clamped in the wall of the fuel supply channel. However, positioning means, e.g. a positioning projection may be provided on the wall of the fuel supply channel.

Bevorzugt weist der Strömungsteiler in der Scheibe mindestens eine Bohrung auf. Ferner weist die Scheibe mehrere Bohrungen auf, welche im Wesentlichen gleichmäßig über den Umfang verteilt sind. Durch diese Bohrungen wird ein kleiner Teil des bevorzugt kalten Brennstoffstroms in den Zwischenraum geleitet, wobei die heiße Tragstruktur somit vom einströmenden kalten Brennstoff thermisch entkoppelt ist. Somit wird der Wärmeübergang in diesem Bereich verringert.Preferably, the flow divider in the disc at least one bore. Furthermore, the disc has a plurality of bores, which are distributed substantially uniformly over the circumference. Through these holes, a small part of the preferably passes cold fuel flow into the gap, wherein the hot support structure is thus thermally decoupled from the incoming cold fuel. Thus, the heat transfer in this area is reduced.

Nach einem weiteren Aspekt der vorliegenden Erfindung wird die genannte Aufgabe durch ein Verfahren zum Betrieb einer solchen Brenneranordnung gelöst, wobei im Betrieb Brennstoff durch den Brennstoffzufuhrkanal geleitet wird, wobei der Hauptteil des Brennstoffs durch die Durchlassöffnung des Strömungsteilers fließt, und ein geringerer Teil des Brennstoffs durch den Zwischenraum des Strömungsteilers strömt, wobei somit Ablagerungen im Zwischenraum weitestgehend verhindert werden.According to another aspect of the present invention, said object is achieved by a method of operating such a burner assembly, wherein in operation, fuel is passed through the fuel supply passage, with the majority of the fuel flowing through the passage opening of the flow divider, and a minor portion of the fuel the space of the flow divider flows, thus deposits in the space are largely prevented.

Somit wird ein geringerer Teil der Strömung durch den Zwischenraum geleitet und verhindert somit die Bildung von Ablagerungen in dem Zwischenraum, das heißt vor allem an der Wandung der Tragstruktur der Brennkammer-Nabe. Eine Verstopfung der Düsen wird somit verhindert.Thus, a lesser part of the flow is passed through the gap and thus prevents the formation of deposits in the gap, that is, especially on the wall of the support structure of the combustion chamber hub. Blockage of the nozzles is thus prevented.

Durch den geringeren Strom ist eine Funktion als Hitzeschutzschild gegeben, da die heiße Tragstruktur vom einströmenden kalten Brennstoff, insbesondere vom kalten Öl, thermisch entkoppelt ist. Der Hauptstrom zur Versorgung der Düsen fließt durch die Durchlassöffnung des Strömungsteilers, wobei diese Durchlassöffnung bevorzugt als große, zentral Bohrung in der Mitte des Strömungsteilers vorgesehen ist. Hohe Temperaturen und Spannungsgradienten bilden sich somit nicht mehr aus. Als erwünschte Folge wird die Lebensdauer signifikant erhöht.Due to the lower current is a function as a heat shield given because the hot support structure is thermally decoupled from the inflowing cold fuel, especially from the cold oil. The main flow for supplying the nozzles flows through the passage opening of the flow divider, this passage opening is preferably provided as a large, central bore in the middle of the flow divider. High temperatures and voltage gradients are therefore no longer formed. As a desired consequence, the life is significantly increased.

Weitere Merkmale, Eigenschaften und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispieles unter Bezugnahme auf die beiliegenden Figuren. Es zeigen:

FIG 1
eine aus EP 0 580 683 B1 bekannte Brenneranordnung,
FIG 2
eine Teilquerschnittsansicht durch eine bekannte Brenneranordnung,
FIG 3
eine Prinzipdarstellung einer erfindungsgemäßen Drallschaufel mit zwei integrierten, unabhängig voneinander ansteuerbaren Gasstufen,
FIG 4
eine Prinzipdarstellung einer Brennkammer-Nabe mit zwei integrierten, unabhängig voneinander ansteuer- baren Gasstufen und einem Ölkanal,
FIG 5
eine Brennkammer-Nabe 18 mit erfindungsgemäßen Strömungsteiler 40,
FIG 6
ein erfindungsgemäßer Strömungsteiler 40.
Further features, properties and advantages of the invention will become apparent from the following description of an embodiment with reference to the accompanying figures. Show it:
FIG. 1
one out EP 0 580 683 B1 known burner arrangement,
FIG. 2
a partial cross-sectional view through a known burner assembly,
FIG. 3
a schematic diagram of a swirl blade according to the invention with two integrated, independently controllable gas levels,
FIG. 4
a schematic representation of a combustion chamber hub with two integrated, independently controllable gas levels and an oil channel,
FIG. 5
a combustion chamber hub 18 with flow divider 40 according to the invention,
FIG. 6
an inventive flow divider 40th

Figur 1 zeigt eine Brenneranordnung 20 nach dem Stand der Technik, die ggf. in Verbindung mit mehreren gleichartigen Anordnungen, beispielsweise in der Brennkammer einer Gasturbinenanlage eingesetzt werden kann. FIG. 1 shows a burner assembly 20 according to the prior art, which may optionally be used in conjunction with a plurality of similar arrangements, for example in the combustion chamber of a gas turbine plant.

Sie besteht aus einem inneren Teil, dem Pilotbrennersystem und einem konzentrisch dazu liegenden äußeren Teil, dem Hauptbrennersystem. Beide Systeme sind für einen Betrieb mit gasförmigen und/oder flüssigen Brennstoffen in beliebiger Kombination geeignet. Das Pilotbrennersystem besteht aus einer zentralen Ölzuführung 1 (Medium G) und einem konzentrisch um diesen herum angeordneten inneren Gas-Zufuhrkanal 2 (Medium F). Dieser wiederum ist umgeben von einem konzentrisch um die Achse des Brenners angeordneten inneren Luft-Zufuhrkanal 3 (Medium E).It consists of an inner part, the pilot burner system and a concentric outer part, the main burner system. Both systems are suitable for operation with gaseous and / or liquid fuels in any combination. The pilot burner system consists of a central oil supply 1 (medium G) and an inner gas supply channel 2 (medium F) arranged concentrically around it. This in turn is surrounded by a concentric about the axis of the burner arranged inner air supply channel 3 (Medium E).

In oder an diesem Kanal kann ein geeignetes Zündsystem angeordnet sein, für welches viele Ausführungsmöglichkeiten bekannt sind und auf dessen Darstellung hier deshalb verzichtet wurde. Die zentrale Ölzuführung 1 weist an ihrem Ende eine Öldüse 5 auf und der innere Luft-Zufuhrkanal 3 weist in seinem Endbereich eine Drallbeschaufelung 6 auf. Ein Pilotbrennersystem 1, 2, 3, 5, 6 kann in einer an sich bekannten Weise, d. h. überwiegend als ein Diffusionsbrenner betrieben werden. Seine Aufgabe besteht darin, den Hauptbrenner in einem stabilen Brennbetrieb aufrecht zu erhalten, da dieser meistens mit einem zu Instabilitäten neigenden Magergemisch betrieben wird.In or on this channel, a suitable ignition system may be arranged, for which many possible embodiments are known and its representation has therefore been omitted here. The central oil feed 1 has at its end an oil nozzle 5 and the inner air supply channel 3 has a swirl blading 6 in its end region. A pilot burner system 1, 2, 3, 5, 6 can be operated in a manner known per se, ie predominantly as a diffusion burner. Its task is to maintain the main burner in a stable burning operation, since this is usually operated with a tendency to instability lean mixture.

Das Hauptbrennersystem weist ein konzentrisch zum Pilotbrennersystem angeordnetes und schräg auf dieses zulaufendes äußeres Luft-Zufuhr-Ringkanalsystem 4 auf. Auch dieses Luft-Zufuhr-Ringkanalsystem 4 ist mit einer Drallbeschaufelung 7 versehen. Die Drallbeschaufelung 7 besteht aus Hohlschaufeln mit Auslassdüsen 11 im Strömungsquerschnitt des Luft-Zufuhr-Ringkanalsystems 4 (Medium A). Diese werden aus einer Zuführungsleitung 8 und einem Ringkanal 9 durch Öffnungen 10 für das Medium B gespeist. Zusätzlich weist der Brenner eine Zuführungsleitung 12 für ein Medium C, bevorzugt Öl, auf, welche in einen Ringkanal 13 mündet, welcher Auslassdüsen 14 für das Medium C im Bereich oder unterhalb der Drallbeschaufelung 7 aufweist.The main burner system has a concentric with the pilot burner system arranged and obliquely on this incoming outer air supply annular duct system 4. This air supply annular channel system 4 is also provided with a swirl blading 7. The swirl blading 7 consists of hollow blades with outlet nozzles 11 in the flow cross-section of the air supply annular channel system 4 (medium A). These are fed from a supply line 8 and an annular channel 9 through openings 10 for the medium B. In addition, the burner has a feed line 12 for a medium C, preferably oil, which opens into an annular channel 13, which has outlet nozzles 14 for the medium C in the region or below the swirl blading 7.

Angedeutet dargestellt ist auch ein Sprühstrahl 15 des Mediums C. Erfindungsgemäß weist der Brenner zusätzlich einen weiteren Kohlegas-Zuführkanal 16 für Medium D auf. Dieser mündet knapp oberhalb der Drallbeschaufelung 7 mit den Auslassdüsen 11 in das äußere Luft-Zufuhr-Ringkanalsystem 4 ein, und zwar an dessen Innenseite, sodass beide zusammen im Prinzip einen Diffusionsbrenner bilden.Also indicated is a spray jet 15 of the medium C. According to the invention, the burner additionally has a further coal gas feed channel 16 for medium D. This opens just above the swirl blading 7 with the outlet nozzles 11 in the outer air supply ring channel system 4, on the inside, so that both together form a diffusion burner in principle.

Figur 2 zeigt eine vergrößerte Teilquerschnittsansicht durch eine bekannte Brenner-Nabe 18 nach dem Stand der Technik. Die Brenneranordnung ist kreisrund, sodass man sich den Ringkanal 9 und 13 als kreisumlaufend vorzustellen hat. FIG. 2 shows an enlarged partial cross-sectional view through a known burner hub 18 according to the prior art. The burner assembly is circular, so you have to imagine the annular channel 9 and 13 as a circle.

So ähnlich kann der Bereich des Hauptbrenners aus Figur 1 realisiert sein. Die Drallschaufeln 7 weisen nur einen Zufuhrkanal mit den Auslassdüsen 11 auf, die vorzugsweise zum Eindüsen eines gasförmigen Mediums B vorgesehen sind. Unterhalb davon in Strömungsrichtung ist eine Auslassdüse 14 zum Eindüsen von vorzugsweise flüssigem Medium C vorgesehen. Es ist eine Vielzahl von Auslassdüsen 14 entlang des kreisumlaufenden Ringkanals 13 angeordnet, sodass die Eindüsung des Mediums C gleichmäßig in den ebenso kreisumlaufenden Brennerraum erfolgen kann.Similarly, the area of the main burner may look like FIG. 1 be realized. The swirl blades 7 have only one supply channel with the outlet nozzles 11, which are preferably provided for injecting a gaseous medium B. Below thereof in the flow direction, an outlet nozzle 14 is provided for injecting preferably liquid medium C. There is a plurality of outlet nozzles 14 arranged along the circular ring channel 13, so that the injection of the medium C can be carried out evenly in the likewise encircling burner chamber.

Diese Darstellung weist in Gegenteil zu der in Figur 1 jedoch nur eine Gaszuleitung und eine Ölzuleitung auf.In contrast to the one in FIG FIG. 1 However, only a gas supply and an oil supply on.

Figur 3 zeigt eine Prinzipdarstellung einer Drallschaufel 7 mit zwei integrierten, unabhängig voneinander ansteuerbaren Gasstufen B und D. FIG. 3 shows a schematic diagram of a swirl blade 7 with two integrated, independently controllable gas levels B and D.

Die Drallschaufel 7 weist zwei voneinander unabhängige Zufuhrkanäle 11 und 21 auf. Der eine Zufuhrkanal mit den Auslassdüsen 11 kann beispielsweise zum Eindüsen des Mediums D und der zweite Zufuhrkanal 21 über die Auslassdüsen 24 zum Eindüsen des Mediums B verwendet werden. Vorzugsweise werden beide durch die Zufuhrkanäle der Drallschaufel 7 einzudüsenden Medien gasförmig sein, z. B. das Eine Erdgas und das Andere Kohlegas. Ebenso kann über diese Auslassdüsen 11 und/oder 21 bei Bedarf ein Inertstoff wie etwa Wasserdampf eingedüst werden.The swirl blade 7 has two independent supply channels 11 and 21. The one feed channel with the outlet nozzles 11 can be used, for example, for injecting the medium D and the second feed channel 21 via the outlet nozzles 24 for injecting the medium B. Preferably, both be injected through the supply channels of the swirl vane 7 media gaseous, z. As the one natural gas and the other coal gas. Likewise, an inert material such as water vapor can be injected via these outlet nozzles 11 and / or 21 if necessary.

Figur 4 zeigt eine Brennstoff-Nabe 18 mit den Zufuhrkanal 16, den Ringkanälen 9 und 13 sowie Öffnungen 10, welche den Brennstoff in die Schaufel 7 führt. FIG. 4 shows a fuel hub 18 with the supply channel 16, the annular channels 9 and 13 and openings 10, which leads the fuel into the blade 7.

Wird der Zuführkanal 12, nachfolgend als Ölkanal 12 bezeichnet mit Wasser gespült, ergeben sich unterschiedliche Temperaturverteilungen. Die beiden Gaszuführungen bleiben heiß und der Ölkanal 12 kühlt stark ab. Die sich einstellenden hohen Wärmegradienten zwischen dem gespülten Ölkanal und den durchwärmten Gas-Passagen reduzieren die Lebensdauer der Brennstoff-Nabe 18.If the supply channel 12, hereinafter referred to as oil passage 12 rinsed with water, there are different temperature distributions. The two gas supply lines remain hot and the oil channel 12 cools down strongly. The resulting high heat gradients between the purged oil passage and the warmed through gas passages reduce the life of the fuel hub 18th

Figur 5 zeigt eine erfindungsgemäße Brennstoff-Nabe 18 mit Strömungsteiler 40. Der Strömungsteiler 40 (Figur 6) besteht aus einem Rohr 45 mit Durchlassöffnung 55 (nachfolgend als Rohröffnung 55 bezeichnet). Eine Scheibe 42 ist am Rohr in Strömungsrichtung gesehen am zuerst kommenden Ende des Rohres 45 angebracht. Die Scheibe 42 weist ebenfalls eine Rohröffnung 55 auf, die mit der Rohröffnung 55 übereinstimmt. Der Durchmesser der Scheibe 42 ist größer als der Durchmesser des Rohres 45. Dadurch bildet sich zwischen der Wand 21 und dem Rohr 45 ein Zwischenraum 38 in Strömungsrichtung aus. Damit weist der Strömungsteiler quasi die Form eines Doppelrohres nämlich des Rohres 45 und der Wand 21, welche hier ebenfalls rohrförmig ausgebildet ist, auf. Die Scheibe 42 kann im Wesentlichen formschlüssig in der Wand 21 angebracht z.B. geklemmt sein. Auch ist die Ausgestaltung eines Positionier-Vorsprungs 35 möglich, auf dem die Scheibe 42 aufliegt. Bohrungen 50 sind in der Scheibe 42 angebracht. Bevorzugt sind diese Bohrungen 50 gleichmäßig über den Umfang verteilt. Durch die in der Scheibe 42 oberhalb angebrachten Bohrungen im Strömungsteiler 40 wird ein Fluidfluss aufgeteilt. Ein einstellbarer geringer Teil der Strömung wird durch diese kleineren Bohrungen 50 in den Zwischenraum 38 geleitet. Dieser Fluidfluss verhindert somit die Bildung von Ablagerungen im Zwischenraum 38 sowie ein Verstopfen der Düsen 14. Durch den geringen Strom ist zudem eine Funktion als Hitzeschutzrohr gegeben. Zusätzlich entkoppelt die abgesenkte Strömung in diesem Bereich die heiße Struktur von der kalten und stellt somit einen Hitzeschutz dar. Die heiße Tragstruktur ist somit vom einströmenden Brennstoff, bevorzugt kaltes Öl, thermisch entkoppelt. Der Hauptstrom zur Versorgung der Düsen 14 fließt weiterhin durch die Rohröffnung 55. Diese ist bevorzugt als zentrale Bohrung in der Mitte des Strömungsteilers 40 realisiert. Durch den Strömungsteiler 42 sowie eine geringe Strömung des Brennstoffs im Zwischenraum 38 ist im Zwischenraum der Wärmeübergang α wesentlich geringer als der Wärmeübergang αvorher ohne Strömungsteiler an der selben Stelle; es gilt daher α << αvorher. Der Hauptstrom zur Versorgung der Düse 14 fließt jedoch weiterhin durch die zentrale Bohrung, das heißt durch die Rohröffnung 55. Hier ist der Wärmeübergang α im Wesentlichen unverändert geblieben, d. h. α ≈ αvorher. FIG. 5 shows a fuel hub 18 according to the invention with flow divider 40. The flow divider 40 (FIG. FIG. 6 ) consists of a tube 45 with passage opening 55 (hereinafter referred to as tube opening 55). A disc 42 is seen on the tube in the flow direction at the first coming end of the tube 45 is mounted. The disc 42 also has a tube opening 55 which coincides with the tube opening 55. The diameter of the disc 42 is greater than the diameter of the tube 45. This forms between the wall 21 and the tube 45, a gap 38 in the flow direction. Thus, the flow divider almost the shape of a double tube namely the tube 45 and the wall 21, which is also here tubular, on. The disk 42 may be substantially positively mounted in the wall 21, for example, clamped. Also, the configuration of a positioning projection 35 is possible, on which the disc 42 rests. Holes 50 are mounted in the disc 42. Preferably, these holes 50 are evenly distributed over the circumference. By the mounted in the disc 42 above holes in the flow divider 40, a fluid flow is divided. An adjustable small portion of the flow is directed through these smaller holes 50 into the gap 38. This fluid flow thus prevents the formation of deposits in the intermediate space 38 and clogging of the nozzles 14. Due to the low current is also given a function as a heat protection tube. In addition, the lowered flow in this area decouples the hot structure from the cold and thus provides heat protection. The hot support structure is thus thermally decoupled from the incoming fuel, preferably cold oil. The main flow for supplying the nozzles 14 continues to flow through the pipe opening 55. This is preferably realized as a central bore in the middle of the flow divider 40. Due to the flow divider 42 and a low flow of the fuel in the intermediate space 38, the heat transfer α in the intermediate space is substantially lower than the heat transfer α previously without flow divider at the same location; it therefore holds α << α before . However, the main flow to supply the nozzle 14 continues to flow through the central bore, that is through the pipe opening 55. Here, the heat transfer α has remained substantially unchanged, ie, α ≈ α before .

Durch den geringen Strom im Zwischenraum 38 ist damit die Funktion des Strömungsteilers 40 als Hitzeschutzschild gegeben und die heiße Tragstruktur wird vom einströmenden kalten Öl entkoppelt. Hohe Temperatur- und Spannungsgradienten bilden sich somit nicht mehr aus. Die Lebensdauer der Brennkammer-Nabe 18 wird somit wesentlich erhöht.Due to the low current in the intermediate space 38, the function of the flow divider 40 is thus given as a heat shield and the hot support structure is decoupled from the incoming cold oil. High temperature and voltage gradients are therefore no longer formed. The life of the combustion chamber hub 18 is thus substantially increased.

Der erfindungsgemäße Strömungsteiler 40 teilt somit den Fluidstrom und zwar in einen geringen Strom, der durch den Zwischenraum 38 fließt und einen mengenmäßigen Hauptstrom, der durch die Rohröffnung 55 fließt auf. Der Strömungsteiler 40 verhindert somit Ablagerungen und ein Verstopfen von Düsen beim Einsatz von flüssigen Brennstoffen. Zusätzlich entkoppelt die abgesenkte Strömung die heiße Struktur von der kalten und stellt somit einen Hitzeschutz dar. Weiterhin werden hohe Wärmegradienten und daraus resultierende thermische Spannungen über einen geringen Querschnitt verhindert. Mit dem Einsatz des Strömungsteilers 40 kann somit das Bauteil 18 eine hohe geforderte Lebensdauer erfüllen. Der Strömungsteiler 40 ist einfach zu fertigen und in vorhandene Brennkammer-Naben 18 leicht zu adaptieren.The flow divider 40 according to the invention thus divides the fluid flow into a small flow which flows through the intermediate space 38 and a quantitative main flow flowing through the tube opening 55. The flow divider 40 thus prevents deposits and clogging of nozzles when using liquid fuels. In addition, the lowered flow decouples the hot structure from the cold and thus provides heat protection. Furthermore, high thermal gradients and resulting thermal stresses are prevented over a small cross section. With the use of the flow divider 40 thus the component 18 can fulfill a high required life. The flow divider 40 is easy to manufacture and easy to adapt to existing combustor hubs 18.

Claims (10)

Brenneranordnung für eine Verfeuerungsanlage zum Verfeuern fluidischer Brennstoffe, welche eine Brenner-Nabe (18), wenigstens einen Luftzufuhrkanal (3, 4) und für jede Brennstoffart wenigstens einen Brennstoffzufuhrkanal (9, 12, 13, 16) aufweist, wobei der wenigstens eine Brennstoffzufuhrkanal (9, 12, 13, 16) zumindest teilweise in der Brenner-Nabe (18) ausgebildet ist,
dadurch gekennzeichnet, dass
in wenigstens einem Brennstoffzufuhrkanal (12) ein Strömungsteiler (40) angeordnet ist, der von der Wandung (21) des Brennstoffzufuhrkanals (12) beabstandet ist, so dass zwischen der Wandung (21) des Brennstoffzufuhrkanals (12) und dem Strömungsteiler (40) ein zum Strömungspfad des durch den Brennstoffzufuhrkanal (12) strömenden Brennstoffes gehörender Zwischenraum (38) gebildet ist.A burner arrangement for a combustion system for the combustion of fluid fuels, which has a burner hub (18), at least one air supply channel (3, 4) and for each fuel type at least one fuel supply channel (9, 12, 13, 16), wherein the at least one fuel supply channel ( 9, 12, 13, 16) is at least partially formed in the burner hub (18),
characterized in that
in at least one fuel supply channel (12) a flow divider (40) is arranged, which is spaced from the wall (21) of the fuel supply channel (12), so that between the wall (21) of the fuel supply channel (12) and the flow divider (40) to the flow path of the flowing through the fuel supply passage (12) fuel belonging gap (38) is formed. Brenneranordnung nach Anspruch 1,
dadurch gekennzeichnet, dass
der Strömungsteiler (40) von einer in den Brennstoffzufuhrkanal (12) eingebrachten Hülse (30) gebildet ist.Burner arrangement according to claim 1,
characterized in that
the flow divider (40) is formed by a sleeve (30) introduced into the fuel feed channel (12). Brenneranordnung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass
der Strömungsteiler (40) zumindest teilweise in die Ringkanal (13) hineinragt.Burner arrangement according to Claim 1 or 2,
characterized in that
the flow divider (40) at least partially protrudes into the annular channel (13). Brenneranordnung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
der Strömungsteiler (40) aus einem Durchflussmittel, insbesondere einem Rohr (45), mit einer Durchflussöffnung (55), sowie einer Scheibe (42) mit korrespondierender Durchflussöffnung (55) besteht.Burner arrangement according to one of the preceding claims,
characterized in that
the flow divider (40) consists of a flow medium, in particular a tube (45), with a flow opening (55) and a disc (42) with a corresponding flow opening (55). Brenneranordnung nach Anspruch 4,
dadurch gekennzeichnet, dass
als Durchflussöffnung (55) eine zentrale Bohrung in der Mitte des Strömungsteilers (40) vorgesehen ist.Burner arrangement according to Claim 4,
characterized in that
as a flow opening (55) a central bore in the middle of the flow divider (40) is provided. Brenneranordnung nach einem der Ansprüche 4-5,
dadurch gekennzeichnet, dass
die Scheibe (42) in Strömungsrichtung gesehen am zuerst kommenden Ende am Durchflussmittel vorgesehen ist.Burner arrangement according to one of claims 4-5,
characterized in that
the disk (42) is provided on the flow means at the first end as viewed in the flow direction. Brenneranordnung nach einem der Ansprüche 4-6,
dadurch gekennzeichnet, dass
die Scheibe (42) in ihrem Durchmesser größer als der Durchmesser des Durchflussmittels ist.Burner arrangement according to one of claims 4-6,
characterized in that
the disc (42) is larger in diameter than the diameter of the flow medium. Brenneranordnung nach einem der Ansprüche 4-7,
dadurch gekennzeichnet, dass
der Strömungsteiler (4) in der Scheibe (42) mindestens eine Bohrung (50) aufweist.Burner arrangement according to one of claims 4-7,
characterized in that
the flow divider (4) in the disc (42) has at least one bore (50). Brenneranordnung nach Anspruch 8,
dadurch gekennzeichnet, dass
die Scheibe (42) mehrere Bohrungen (50) aufweist, welche im Wesentlichen gleichmäßig über den Umfang verteilt sind.Burner assembly according to claim 8,
characterized in that
the disc (42) has a plurality of bores (50) which are distributed substantially uniformly over the circumference. Verfahren zum Betrieb einer Brenneranordnung nach einem der Ansprüche 4-9, dadurch gekennzeichnet, dass im Betrieb Brennstoff durch den Brennstoffzufuhrkanal (12) geleitet wird, wobei der Hauptteil des Brennstoffs durch die Durchlassöffnung (55) des Strömungsteilers (40) fließt, und ein geringerer Teil des Brennstoffs durch den Zwischenraum (38) des Strömungsteilers (40) strömt, wobei somit Ablagerungen im Zwischenraum (38) weitestgehend verhindert werden.A method of operating a burner assembly according to any one of claims 4-9, characterized in that in operation fuel is passed through the fuel supply passage (12), the main part of the fuel flowing through the passage opening (55) of the flow divider (40), and a smaller one Part of the fuel through the intermediate space (38) of the flow divider (40) flows, thus deposits in the intermediate space (38) are largely prevented.
EP09162827A 2009-06-16 2009-06-16 Burner assembly for a firing assembly for firing fluid fuels and method for operating such a burner assembly Not-in-force EP2264370B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP09162827A EP2264370B1 (en) 2009-06-16 2009-06-16 Burner assembly for a firing assembly for firing fluid fuels and method for operating such a burner assembly
CN201010202904.4A CN101922714B (en) 2009-06-16 2010-06-10 Burner arrangement for a combustion system for combusting liquid fuels and method for operating such a burner arrangement
US12/814,707 US20100316966A1 (en) 2009-06-16 2010-06-14 Burner arrangement for a combustion system for combusting liquid fuels and method for operating such a burner arrangement
RU2010124411/06A RU2531714C2 (en) 2009-06-16 2010-06-15 Burner system for plant to burn fuel of fluid medium type and method of operation of such burner system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09162827A EP2264370B1 (en) 2009-06-16 2009-06-16 Burner assembly for a firing assembly for firing fluid fuels and method for operating such a burner assembly

Publications (2)

Publication Number Publication Date
EP2264370A1 true EP2264370A1 (en) 2010-12-22
EP2264370B1 EP2264370B1 (en) 2012-10-10

Family

ID=41262140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09162827A Not-in-force EP2264370B1 (en) 2009-06-16 2009-06-16 Burner assembly for a firing assembly for firing fluid fuels and method for operating such a burner assembly

Country Status (4)

Country Link
US (1) US20100316966A1 (en)
EP (1) EP2264370B1 (en)
CN (1) CN101922714B (en)
RU (1) RU2531714C2 (en)

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JP7200077B2 (en) * 2019-10-01 2023-01-06 三菱重工業株式会社 Gas turbine combustor and its operation method
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Also Published As

Publication number Publication date
CN101922714A (en) 2010-12-22
RU2531714C2 (en) 2014-10-27
US20100316966A1 (en) 2010-12-16
CN101922714B (en) 2014-12-17
EP2264370B1 (en) 2012-10-10
RU2010124411A (en) 2011-12-20

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