EP2263044B1 - Grössenskalierung eines brenners - Google Patents
Grössenskalierung eines brenners Download PDFInfo
- Publication number
- EP2263044B1 EP2263044B1 EP09728642.1A EP09728642A EP2263044B1 EP 2263044 B1 EP2263044 B1 EP 2263044B1 EP 09728642 A EP09728642 A EP 09728642A EP 2263044 B1 EP2263044 B1 EP 2263044B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- quarl
- burner
- section
- fuel
- flame
- 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.)
- Not-in-force
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—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
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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
- F23R3/346—Feeding into different combustion zones for staged combustion
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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
- F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
- F23R2900/00016—Retrofitting in general, e.g. to respect new regulations on pollution
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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
- F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
- F23R2900/00017—Assembling combustion chamber liners or subparts
Definitions
- the small pilot combustor combined with very hot cooling air (above 750 °C) premixed with fuel act as a flameless burner, where reactants (oxygen & fuel) are premixed with products of combustion and a distributed flame is established at the forward stagnation point of the swirl induced recirculation zone.
- the burner utilizes aerodynamics stabilization of the flame and confines the flame stabilization zone - the recirculation zone - in the multiple quarl arrangement.
- the multiple quarl arrangement is an important feature of the design of the provided burner for the following reasons.
- the quarl (or also called diffuser):
- FIG 1 the burner is depicted with the burner 1 having a housing 2 enclosing the burner components.
- Figure 2 shows for the sake of clarity a cross sectional view of the burner above a rotational symmetry axis.
- the main parts of the burner are the radial swirler 3, the multi quarl 4a, 4b, 4c and the pilot combustor 5.
- the burner loperates according to the principle of "supplying" heat and high concentration of free radicals from the a pilot combustor 5 exhaust 6 to a main flame 7 burning in a lean premixed air/fuel swirl emerging from a first exit 8 of a first lean premixing channel 10 and from a second exit 9 of a second lean premixing channel 11, whereby a rapid and stable combustion of the main lean premixed flame 7 is supported.
- Said first lean premixing channel 10 is formed by and between the walls 4a and 4b of the multi quarl.
- the second lean premixing channel 11 is formed by and between the walls 4b and 4c of the multi quarl.
- the outermost rotational symmetric wall 4c of the multi quarl is provided with an extension 4c1 to provide for the optimal length of the multi quarl arrangement.
- the first 10 and second 11 lean premixing channels are provided with swirler wings forming the swirler 3 to impart rotation to the air/fuel mixture passing through the channels.
- Air 12 is provided to the first 10 and second 11 channels at the inlet 13 of said first and second channels.
- the swirler 3 is located close to the inlet 13 of the first and second channels.
- fuel 14 is introduced to the air/fuel swirl through a tube 15 provided with small diffusor holes 15b located at the air 12 inlet 13 between the swirler 3 wings, whereby the fuel is distributed into the air flow through said holes as a spray and effectively mixed with the air flow. Additional fuel can be added through a second tube 16 emerging into the first channel 10.
- the pilot combustor 5 supplies heat and supplements a high concentration of free radicals directly to a forward stagnation point P and the shear layer 18 of the main swirl induced recirculation zone 20, where the main lean premixed flow is mixed with hot gases products of combustion provided by the pilot combustor 5.
- the pilot combustor 5 is provided with walls 21 enclosing a combustion room for a pilot combustion zone 22. Air is supplied to the combustion room through fuel channel 23 and air channel 24.
- a distributor plate 25 provided with holes over the surface of the plate. Said distributor plate 25 is separated a certain distance from said walls 21 forming a cooling space layer 25a. Cooling air 26 is taken in through a cooling inlet 27 and meets the outside of said distributor plate 25, whereupon the cooling air 26 is distributed across the walls 21 of the pilot combustor to effectively cool said walls 21.
- the cooling air 26 is after said cooling let out through a second swirler 28 arranged around a pilot quarl 29 of the pilot combustor 5.
- Further fuel can be added to the combustion in the main lean flame 7 by supplying fuel in a duct 30 arranged around and outside the cooling space layer 25a. Said further fuel is then let out and into the second swirler 28, where the now hot cooling air 26 and the fuel added through duct 30 is effectively premixed.
- Recirculating products which are: source of heat and active species (symbolized by means of arrows 1a and 1b), located within the recirculation zone 20, have to be stationary in space and time downstream from the mixing section of the burner 1 to enable pyrolysis of the incoming mixture of fuel and air. If a steady combustion process is not prevailing, thermo-acoustics instabilities will occur.
- a premixed or turbulent diffusion combustion swirl provides an effective way of premixing fuel and air.
- the entrainiment of the fuel/air mixture into the shear layer of the recirculation zone 20 is proportional to the strength of the recirculation zone, the swirl number and the characteristics recirculation zone velocity URZ.
- the process is initiated and stabilized by means of transporting heat and free radicals 31 from the previously combusted fuel and air, back upstream towards the flame front 7.
- the combustion process is very lean, as is the case in lean-partially premixed combustion systems, and as a result the combustion temperature is low, the equilibrium levels of free radicals is also very low.
- the free radicals produced by the combustion process quickly relax, see Fig. 6 , to the equilibrium level that corresponds to the temperature of the combustion products. This is due to the fact that the rate of this relaxation of the free radicals to equilibrium increases exponentially with increase in pressure, while on the other hand the equilibrium level of free radicals decreases exponentially with temperature decrease.
- the relaxation time of the free radicals can be short compared to the "transport" time required for the free radicals (symbolized by arrows 31) to be convected downstream, from the point where they were produced in the shear layer 18 of the main recirculation zone 20, back upstream, towards the flame front 7 and the forward stagnation point P of the main recirculation zone 20.
- This invention utilizes high non-equilibrium levels of free radicals 32 to stabilize the main lean combustion 7.
- the scale of the small pilot combustor 5 is kept small and most of the combustion of fuel occurs in the lean premixed main combustor (at 7 and 18), and not in the small pilot combustor 5.
- the small pilot combustor 5, can be kept small, because the free radicals 32 are released near the forward stagnation point P of the main recirculation zone 20. This is generally the most efficient location to supply additional heat and free radicals to swirl stabilized combustion (7).
- the time scale between quench and utilization of free radicals 32 is very short not allowing free radicals 32 to relax to low equilibrium levels.
- the forward stagnation point P of the main-lean re-circulating zone 20 is maintained and aerodynamically stabilized in the quarl (4a), at the exit 6 of the small pilot combustor 5.
- zone 22 the exit of the small pilot combustor 5 is positioned on the centerline and at the small pilot combustor 5 throat 33.
- the burner utilizes aerodynamics stabilization of the flame and confines the flame stabilization zone - recirculation zone (5), in the multiple quarl arrangement (4a, 4b and 4c).
- the multiple quarl (the term multiple quarl is herein sometimes used for multiple quarl sections defining the completed quarl of the burner) arrangement is an important feature of the disclosed burner design for the reasons listed below.
- the quarl (or sometimes called the diffuser):
- the quarl (or diffuser) and the imparted swirl provides a possibility of a simple scaling of the disclosed burner geometry for different burner powers.
- the igniter 34 as in prior art burners, is placed in the outer recirculation zone, which is illustrated in Figure 4b , the fuel/air mixture entering this region must often be made rich in order to make the flame temperature sufficiently hot to sustain stable combustion in this region.
- the flame then often cannot be propagated to the main recirculation until the main premixed fuel and airflow becomes sufficiently rich, hot and has a sufficient pool of free radicals, which occurs at higher fuel flow rates.
- the flame cannot propagate from the outer recirculation zone to the inner main recirculation zone shortly after ignition, it must propagate at higher pressure after the engine speed begins to increase.
- the combustion - flame front 7 also expands outwards in a conical shape from this forward stagnation point P, as illustrated in Figure 2 .
- This conical expansion downstream allows the heat and free radicals 32 generated upstream to support the combustion downstream allowing the flame front 7 to widen as it moves downstream.
- the quarl (4a, 4b, 4c), illustrated in Figure 2 compared to swirl stabilized combustion without the quarl, shows how the quarl shapes the flame to be more conical and less hemispheric in nature.
- a more conical flame front allows for a point source of heat to initiate combustion of the whole flow field effectively.
- the combustion process within the burner 1 is staged.
- lean flame 35 is initiated in the small pilot combustor 5 by adding fuel 23 mixed with air 24 and igniting the mixture utilizing ignitor 34.
- ignition equivalence ratio of the flame 35 in the small pilot combustor 5 is adjusted at either lean (below equivalence ratio 1, and at approximately equivalence ratio of 0,8) or rich conditions (above equivalence ratio 1, and at approximately equivalence ratio between 1,4 and 1,6).
- lean low equivalence ratio 1, and at approximately equivalence ratio of 0,8
- rich conditions above equivalence ratio 1, and at approximately equivalence ratio between 1,4 and 1,6.
- the reason why the equivalence ratio within the small pilot combustor 5 is at rich conditions in the range between 1,4 and 1,6 is emission levels.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Claims (4)
- Verfahren zum Skalieren der Größe eines Brenners (1) einer Gasturbinenmaschine, die ein Brennergehäuse (2) umfasst, wobei der Brenner Folgendes aufweist:- sich axial gegenüberliegende stromaufwärts gelegene und stromabwärts gelegene Endabschnitte;- an einem stromaufwärts gelegenen Ende des Brenners (1) Brennstoff (14) und Luft (12), die als eine Mischung aus Luft und Brennstoff aus einem Ausgang (8) eines Vormischkanals (10) bereitgestellt werden, um eine Hauptflamme (7) an dem stromabwärts gelegenen Ende des Brenners (1) zu unterhalten;- wobei der Vormischkanal (10) an seinen Ausgängen (8) durch eine runde Innenwand, die von einem inneren Brennersteinabschnitt (4a) gebildet ist, und eine runde Außenwand, die von einem äußeren Brennersteinabschnitt (4b) gebildet ist, definiert ist.- dadurch gekennzeichnet, dass das Verfahren die folgenden Schritte umfasst:- Erhöhen der Größe des Brenners (1) durch Hinzufügen eines Brennersteinabschnitts (4c) außerhalb des und umlaufend um den vorher äußersten Brennersteinabschnitt (4b) und dadurch in einem ringförmigen Raum zwischen dem hinzugefügten Brennersteinabschnitt (4c) und dem bestehenden äußeren Brennersteinabschnitt (4b) Bilden eines zusätzlichen Vormischkanals (11), der an seinen Ausgängen (9) durch eine runde Innenwand, die durch den vorher äußersten Brennersteinabschnitt (4b) gebildet ist, und eine runde Außenwand, die durch den hinzugefügten Brennersteinabschnitt (4c) gebildet ist, definiert ist;- wobei die Brennersteinabschnitte (4a, 4b, 4c) einen Verbrennungsraum zum Aufnehmen der Hauptflamme (7) des Brenners (1) definieren, wobei ein äußerer Brennersteinabschnitt (4c, 4b) einen größeren Durchmesser aufweist als ein benachbarter innerer Brennersteinabschnitt (4b, 4a) und sich in einem größeren Abstand stromabwärts als der benachbarte innere Brennersteinabschnitt (4b, 4a) erstreckt, wobei jeder Brennersteinabschnitt (4a, 4b, 4c) die Konfiguration des konischen Mantels eines Kegelstumpfs aufweist und aufeinanderfolgend einer nach dem anderen in der stromabwärts gelegenen Richtung des Brenners (1) angeordnet ist, wobei der engste Teil des Mantels eines stromabwärts gelegenen Brennersteinabschnitts (4b) den weitesten Teil des Mantels des nächstgelegenen stromaufwärts gelegenen Brennersteinabschnitts (4a) umgibt.
- Verfahren nach Anspruch 1, das ferner die folgenden Schritte umfasst:- Erhöhen der Größe des Brenners (1) durch Hinzufügen eines Brennersteinabschnitts (4d) außerhalb des und umlaufend um den vorher äußersten Brennersteinabschnitt (4c) und dadurch in einem ringförmigen Raum zwischen dem hinzugefügten Brennersteinabschnitt (4d) und dem bestehenden äußeren Brennersteinabschnitt (4c) Bilden eines zusätzlichen Vormischkanals (11b), der an seinem Ausgang durch eine runde Innenwand, die durch den vorher äußersten Brennersteinabschnitt (4c) gebildet ist, und eine runde Außenwand, die durch den hinzugefügten Brennersteinabschnitt (4d) gebildet ist, definiert ist;- wobei die Brennersteinabschnitte (4a, 4b, 4c, 4d) einen Verbrennungsraum zum Aufnehmen der Hauptflamme (7) des Brenners (1) definieren, wobei ein äußerer Brennersteinabschnitt (4d, 4c, 4b) einen größeren Durchmesser aufweist als ein benachbarter innerer Brennersteinabschnitt (4c, 4b, 4a) und sich in einem größeren Abstand stromabwärts als sein benachbarter innerer Brennersteinabschnitt (4c, 4b, 4a) erstreckt.
- Verfahren nach Anspruch 2, das ferner den folgenden Schritt umfasst:- Anordnen der Wirbelanzahlen der Luft/Brennstoff-Mischung, die den Kanälen (10, 11, 11b) zur Verfügung gestellt wird, um die Wirbelanzahlen gemäß SN,10 > SN, 11 > SN, 11b zu halten, wobei jedoch die Wirbelanzahlen alle oberhalb SN = 0,6 und nicht größer als SN = 0,8 sein sollten.
- Größenskalierbarer Brennerstein in einem Brenner (1) für eine Gasturbinenmaschine, wobei- der Brenner (1) sich axial gegenüberliegende stromaufwärts gelegene und stromabwärts gelegene Endabschnitte aufweist;- Brennstoff und Luft gemischt und dem Brenner (1) zur Verfügung gestellt werden, woraufhin der Brennstoff in einer Hauptflamme (7) des Brenners (1) verbrannt wird,- ein Brennerstein (4a, 4b, 4c) angeordnet ist, um die Hauptflamme (7) aufzunehmen,
dadurch gekennzeichnet, dass- der skalierbare Brennerstein aus mehreren Brennersteinabschnitten (4a, 4b, 4c) gebildet ist, wobei jeder Brennersteinabschnitt (4a, 4b, 4c) die Konfiguration des konischen Mantels eines Kegelstumpfs aufweist und aufeinanderfolgend einer nach dem anderen in der stromabwärts gelegenen Richtung des Brenners (1) angeordnet ist, wobei der engste Teil des Mantels eines stromabwärts gelegenen Brennersteinabschnitts (4b) den weitesten Teil des Mantels des nächstgelegenen stromaufwärts gelegenen Brennersteinabschnitts (4a) umgibt,- ein ringförmiger Kanal (10, 11) für vorgemischte Luft und Brennstoff zwischen zwei aufeinanderfolgenden Brennersteinabschnitten (4a, 4b) angeordnet ist,- der Brennerstein angeordnet ist, so dass weitere Brennersteinabschnitte (4c, 4d) zu einer bestehenden Anzahl von wenigstens zwei Brennersteinabschnitten (4a, 4b) hinzugefügt werden können, und- der Brennerstein angeordnet ist, so dass hinzugefügte Brennersteinabschnitte (4d, 4c) entfernt werden können, bis ein Minimum von zwei Brennersteinabschnitten (4a, 4b) verbleibt.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09728642.1A EP2263044B1 (de) | 2008-04-01 | 2009-03-26 | Grössenskalierung eines brenners |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08006666A EP2107311A1 (de) | 2008-04-01 | 2008-04-01 | Größenskalierung eines Brenners |
EP09728642.1A EP2263044B1 (de) | 2008-04-01 | 2009-03-26 | Grössenskalierung eines brenners |
PCT/EP2009/053555 WO2009121776A1 (en) | 2008-04-01 | 2009-03-26 | Size scaling of a burner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2263044A1 EP2263044A1 (de) | 2010-12-22 |
EP2263044B1 true EP2263044B1 (de) | 2013-05-15 |
Family
ID=39810145
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08006666A Withdrawn EP2107311A1 (de) | 2008-04-01 | 2008-04-01 | Größenskalierung eines Brenners |
EP09728642.1A Not-in-force EP2263044B1 (de) | 2008-04-01 | 2009-03-26 | Grössenskalierung eines brenners |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08006666A Withdrawn EP2107311A1 (de) | 2008-04-01 | 2008-04-01 | Größenskalierung eines Brenners |
Country Status (6)
Country | Link |
---|---|
US (1) | US20110027728A1 (de) |
EP (2) | EP2107311A1 (de) |
CN (1) | CN101981379B (de) |
ES (1) | ES2417158T3 (de) |
RU (1) | RU2455570C1 (de) |
WO (1) | WO2009121776A1 (de) |
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US9366443B2 (en) * | 2013-01-11 | 2016-06-14 | Siemens Energy, Inc. | Lean-rich axial stage combustion in a can-annular gas turbine engine |
US8794217B1 (en) | 2013-02-07 | 2014-08-05 | Thrival Tech, LLC | Coherent-structure fuel treatment systems and methods |
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JP3940705B2 (ja) * | 2003-06-19 | 2007-07-04 | 株式会社日立製作所 | ガスタービン燃焼器及びその燃料供給方法 |
KR101178195B1 (ko) * | 2003-09-05 | 2012-08-30 | 지멘스 악티엔게젤샤프트 | 가스 터빈 엔진에서의 연소 안정화 장치 |
DE112005001695A5 (de) * | 2004-08-27 | 2007-11-22 | Alstom Technology Ltd. | Mischeranordnung |
EP1659339A1 (de) * | 2004-11-18 | 2006-05-24 | Siemens Aktiengesellschaft | Verfahren zum Anfahren eines Brenners |
US20080083224A1 (en) * | 2006-10-05 | 2008-04-10 | Balachandar Varatharajan | Method and apparatus for reducing gas turbine engine emissions |
EP2107300A1 (de) * | 2008-04-01 | 2009-10-07 | Siemens Aktiengesellschaft | Dralleinrichtung mit Gasinjektor |
-
2008
- 2008-04-01 EP EP08006666A patent/EP2107311A1/de not_active Withdrawn
-
2009
- 2009-03-26 WO PCT/EP2009/053555 patent/WO2009121776A1/en active Application Filing
- 2009-03-26 RU RU2010144571/06A patent/RU2455570C1/ru not_active IP Right Cessation
- 2009-03-26 CN CN2009801112622A patent/CN101981379B/zh not_active Expired - Fee Related
- 2009-03-26 US US12/935,923 patent/US20110027728A1/en not_active Abandoned
- 2009-03-26 EP EP09728642.1A patent/EP2263044B1/de not_active Not-in-force
- 2009-03-26 ES ES09728642T patent/ES2417158T3/es active Active
Also Published As
Publication number | Publication date |
---|---|
EP2263044A1 (de) | 2010-12-22 |
RU2010144571A (ru) | 2012-05-10 |
RU2455570C1 (ru) | 2012-07-10 |
CN101981379A (zh) | 2011-02-23 |
ES2417158T3 (es) | 2013-08-06 |
EP2107311A1 (de) | 2009-10-07 |
US20110027728A1 (en) | 2011-02-03 |
CN101981379B (zh) | 2012-06-20 |
WO2009121776A1 (en) | 2009-10-08 |
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