EP1048898B1 - Brenner - Google Patents
Brenner Download PDFInfo
- Publication number
- EP1048898B1 EP1048898B1 EP98811145A EP98811145A EP1048898B1 EP 1048898 B1 EP1048898 B1 EP 1048898B1 EP 98811145 A EP98811145 A EP 98811145A EP 98811145 A EP98811145 A EP 98811145A EP 1048898 B1 EP1048898 B1 EP 1048898B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- burner
- built
- components
- flow
- air
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/07002—Premix burners with air inlet slots obtained between offset curved wall surfaces, e.g. double cone burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2210/00—Noise abatement
Definitions
- the invention relates to a burner for operating a unit for generation a hot gas.
- the cooling air flowing into the combustion chamber has a sound-absorbing effect and thus contributes to damping thermoacoustic vibrations.
- an increasing proportion of the air is passed through the burners themselves in modern gas turbines and the cooling air flow is reduced.
- the problems mentioned at the outset occur increasingly in modern combustion chambers.
- One way of soundproofing is to connect Helmholtz dampers in the combustion chamber hood or in the area of the cooling air supply. Where space is limited, as is the case for modern, compact combustion chambers however, such dampers can be difficult to accommodate prepare and is associated with great design effort.
- thermoacoustic Vibrations through active acoustic excitation.
- the the shear layer forming in the area of the burner is acoustically excited. With a suitable phase position between the thermoacoustic vibrations and the excitation can thereby dampen the combustion chamber vibrations to reach.
- such a solution requires the addition of additional ones Elements in the combustion chamber area.
- US 5433596 describes a premix burner for stabilizing the lean Combustion, especially for the operation of a gas turbine with medium or low calorific fuels is suitable. For the purpose of improvement the mixing of the fuel with the combustion air and thus Avoiding local recirculation areas will create vortex elements in the entry gap the combustion air in the premix zone.
- the invention as characterized in the claims, is the object to create a device that provides effective suppression enables thermoacoustic vibrations and with the least possible constructive Effort is connected.
- This object is achieved according to the invention solved a burner of the type mentioned in the independent claim.
- advantageous Execution types reflect the dependent claims.
- the invention is based on the knowledge that the flow instabilities in the burner mostly have a dominant mode.
- the damping of this dominant mode is a priority for the suppression of thermoacoustic vibrations.
- the relevant frequencies are between a few 10 Hz and a few kHz.
- the convection speed depends on the burner and is typically a few 10 m / s, for example 30 m / s.
- a burner according to the invention for operating an aggregate for generation a hot gas consists essentially of at least two hollow, in Direction of the flow nested partial bodies, their central axes run offset from each other, such that adjacent walls the partial body at the burner slots tangential air inlet channels for the Influx of combustion air into one specified by the partial bodies Form interior.
- the burner has a plurality of internals projecting into the flow, wherein According to the invention, the distances between adjacent installation elements are smaller or approximately equal to half the wavelength of a dominant mode of thermoacoustic Are vibrations.
- the internals are at the burner outlet arranged. It has also proven to be particularly advantageous if the internals arranged both at the burner outlet and along the burner slots are.
- any conceivable shape is possible for the internals. They can be both flat be, as well as have a distinctive three-dimensional structure. With advantage they become roughly in a sawtooth structure, sinusoidal or rectangular educated. It is particularly advantageous if the internals are in the form of vortex generators are designed. There is a device with "vortex generator” referred to, which introduces axial vortex strength into a flow without a recirculation zone to produce in a trailing area.
- Figure 1 shows a known premix burner, which consists of two half hollow Partial cone bodies 1, 2, which are arranged offset to one another.
- the Offset of the respective central axis of the partial cone bodies 1, 2 to one another creates a tangential on both sides in a mirror-image arrangement Air inlet duct 5, 6 at the burner slots 5a, 6a through which the Combustion air 7 flows into the interior 8 of the burner.
- the partial cone bodies 1, 2 have cylindrical starting parts 9, 10, which have a fuel nozzle 11 include through which liquid fuel 12 is injected.
- the Partial cone body 1, 2 as required each have a fuel line 13, 14 with Openings 15 are provided, through which gaseous fuel 16 the combustion air 7 flowing through the tangential air inlet ducts 5, 6 is admixed.
- the burner has a collar-shaped, as anchoring for the partial cone body 1, 2 serving front plate 18 with a number of holes 19, through which, if necessary, dilution air or cooling air 20 front part of the combustion chamber or its wall can be supplied.
- the fuel injection can be an air-assisted nozzle or is a nozzle that works according to the pressure atomization principle.
- the conical spray pattern is created by the tangentially flowing combustion air flows 7 enclosed.
- the concentration of fuel injected 12 is continuously in the direction of flow 30 through the combustion air flows 7 dismantled.
- a liquid Fuel 12 is in the area of vortex bursting, that is in the area of Backflow zone 24 at the end of the premix burner the optimal, homogeneous Fuel concentration reached across the cross section.
- the ignition of the Fuel / combustion air mixture begins at the top of the backflow zone 24. Only at this point can a stable flame front 25 arise.
- each partial cone body had 1.2 at the burner outlet ten triangular internals 32 attached, the total of a sawtooth structure formed (Fig. 2).
- the dimensions of the structure depended on it according to the wavelength the dominant mode of the flow instability to be suppressed, whose frequency in the exemplary embodiment was in the kHz range.
- the experimental determination of the pressure fluctuations of Fig. 5 shows that the amplitude of the thermoacoustic fluctuations due to the internals ("Sawtooth internals", open circles) compared to a conventional burner ("unchanged", full squares) reduced by one to two orders of magnitude become.
- Figure 6 shows the results of an experimental Determination of pressure fluctuations in the 100 Hz range when in use of conventional burners ("unchanged”, full squares) and of Burners according to the previous embodiment of the invention ("sawtooth internals", open circles) as a function of the air ratio ⁇ .
- the air number ⁇ is included a measure of the ratio of those introduced into the combustion chamber to that theoretically required amount of air for complete combustion.
- Fig. 6 shows, by the present invention, the amplitude of the pressure vibrations in the particularly relevant range 1.8 ⁇ ⁇ ⁇ 2.2 also in the 100 Hz range still significantly reduced.
- Vortex generators 34 instead of geometrically simple internals, Vortex generators 34 used as internals.
- Figures 4a-b show two embodiments for vortex generators 34, each at the edge 36 of a partial cone body are attached.
- the reference symbol 40 denotes the local flow direction of the working fluid.
- the through the vortex generators 34 generated vortex structures 42 are each shown schematically.
- the vortex generator of Fig. 4a generates a pair of vertebrae that face inwards rotates, similar to a delta wing.
- the vortex generator shown in Fig. 4b creates an outward rotating pair of vertebrae.
- each vortex generator 34 was used in the Burner installed. As in Fig. 2, ten of the vortex generators were at the burner outlet attached along the circumference of the partial cone body 1,2. Each five more vortex generators were shown along the burner slots as shown in FIG. 3 5a, 6a attached. 3 shows only one of the two burner slots.
- FIG. 7 shows the results of an experimental determination of the pressure fluctuations in the 100 Hz range depending on the air ratio ⁇ when used a conventional burner ("unchanged”, full squares) and a burner with the described arrangement of vortex generators ("Vortex generators", open circles).
- the pressure fluctuations are over one wide range ⁇ ⁇ 2.2 significantly reduced compared to an unchanged burner.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Description
- Fig. 1
- einen Brenner nach dem Stand der Technik in perspektivischer Darstellung entsprechend aufgeschnitten;
- Fig. 2
- eine Vorderansicht eines Ausführungsbeispiels eines erfindungsgemäßen Brenners;
- Fig. 3
- eine schematische Seitenansicht eines erfindungsgemäßen Brenners;
- Fig. 4a-b
- Ausführungsbeispiele für Wirbelgeneratoren zum Einsatz in einem erfindungsgemäßen Brenner;
- Fig. 5
- eine logarithmische Auftragung der relativen Druckamplitude im kHz-Bereich gegen die Brennerleistung für einen unveränderten Brenner nach dem Stand der Technik und für einen erfindungsgemäßen Brenner mit sägezahnförmigen Einbauten;
- Fig. 6
- eine Auftragung der relativen Druckamplitude im 100 Hz-Bereich gegen die Luftzahl λ für einen unveränderten Brenner nach dem Stand der Technik und für einen erfindungsgemäßen Brenner mit sägezahnförmigen Einbauten;
- Fig. 7
- eine Auftragung der relativen Druckamplitude im 100 Hz-Bereich gegen die Luftzahl λ für einen unveränderten Brenner nach dem Stand der Technik und für einen erfindungsgemäßen Brenner mit Wirbelgeneratoren;
- 1,2
- Teilkegelkörper
- 5,6
- Lufteintrittskanal
- 5a,6a
- Brennerschlitze
- 7
- Verbrennungsluft
- 8
- Innenraum
- 9,10
- zylindrische Anfangsteile
- 11
- Brennstoffdüse
- 12
- flüssiger Brennstoff
- 13,14
- Brennstoffleitung
- 15
- Öffnungen
- 16
- gasförmiger Brennstoff
- 17
- Brennraum
- 18
- Frontplatte
- 19
- Bohrungen
- 20
- Kühlluft
- 24
- Rückströmzone
- 25
- Flammenfront
- 30
- Richtung der Strömung des Brennstoff/Luft-Gemischs
- 32
- Einbauten
- 34
- Wirbelgenerator
- 36
- Kegelköperrand
- 40
- lokale Strömungsrichtung
- 42
- Wirbelstruktur
Claims (5)
- Brenner zum Betrieb eines Aggregats zur Erzeugung eines Heißgases unter verminderten thermoakustischen Schwingungen, wobei der Brenner im wesentlichen aus mindestens zwei hohlen, in Richtung der Strömung (30) eines Brennstoff/Luftgemischs ineinandergeschachtelten Teilkörpern (1, 2) besteht, deren Mittelachsen zueinander versetzt verlaufen, dergestalt, daß benachbarte Wandungen der Teilkörper (1, 2) an den Brennerschlitzen (5a, 6a) tangentiale Lufteintrittskanäle (5, 6) für die Einströmung von Verbrennungsluft (7) in einen von den Teilkörpern (1, 2) vorgegebenen Innenraum (8) bilden, und wobei der Brenner zum Einbringen axialer Wirbelstärke in die Strömung (30) eine Mehrzahl von in die Strömung (30) ragender Einbauten (32) aufweist, dadurch gekennzeichnet, dass die Abstände benachbarter Einbauelemente (32) kleiner oder etwa gleich der halben Wellenlänge einer dominanten Mode der thermoakustischen Schwingungen sind.
- Brenner nach Anspruch 1,
bei dem die Einbauten (32) am Brenneraustritt angeordnet sind. - Brenner nach Anspruch 1,
bei dem die Einbauten (32) am Brenneraustritt und entlang der Brennerschlitze (5a,6a) angeordnet sind. - Brenner nach einem der vorigen Ansprüche,
bei dem die Einbauten (32) in einer Sägezahnstruktur ausgebildet sind. - Brenner nach einem der vorigen Ansprüche,
bei dem die Einbauten (32) Wirbelgeneratoren (34) sind.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98811145A EP1048898B1 (de) | 1998-11-18 | 1998-11-18 | Brenner |
DE59810606T DE59810606D1 (de) | 1998-11-18 | 1998-11-18 | Brenner |
US09/434,448 US6196835B1 (en) | 1998-11-18 | 1999-11-05 | Burner |
DE10022969A DE10022969A1 (de) | 1998-11-18 | 2000-05-14 | Brenner |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98811145A EP1048898B1 (de) | 1998-11-18 | 1998-11-18 | Brenner |
DE10022969A DE10022969A1 (de) | 1998-11-18 | 2000-05-14 | Brenner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1048898A1 EP1048898A1 (de) | 2000-11-02 |
EP1048898B1 true EP1048898B1 (de) | 2004-01-14 |
Family
ID=26005629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98811145A Expired - Lifetime EP1048898B1 (de) | 1998-11-18 | 1998-11-18 | Brenner |
Country Status (3)
Country | Link |
---|---|
US (1) | US6196835B1 (de) |
EP (1) | EP1048898B1 (de) |
DE (1) | DE10022969A1 (de) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19851636A1 (de) * | 1998-11-10 | 2000-05-11 | Asea Brown Boveri | Dämpfungsvorrichtung zur Reduzierung der Schwingungsamplitude akustischer Wellen für einen Brenner |
US6672862B2 (en) | 2000-03-24 | 2004-01-06 | North American Manufacturing Company | Premix burner with integral mixers and supplementary burner system |
EP1217295B1 (de) | 2000-12-23 | 2006-08-23 | ALSTOM Technology Ltd | Brenner zur Erzeugung eines Heissgases |
GB2375601A (en) * | 2001-05-18 | 2002-11-20 | Siemens Ag | Burner apparatus for reducing combustion vibrations |
EP1262714A1 (de) * | 2001-06-01 | 2002-12-04 | ALSTOM (Switzerland) Ltd | Brenner mit Abgasrückführung |
JP4508474B2 (ja) * | 2001-06-07 | 2010-07-21 | 三菱重工業株式会社 | 燃焼器 |
US6889686B2 (en) | 2001-12-05 | 2005-05-10 | Thomas & Betts International, Inc. | One shot heat exchanger burner |
DE10205428A1 (de) * | 2002-02-09 | 2003-09-11 | Alstom Switzerland Ltd | Vormischbrenner mit erhöhter Flammenstabilität |
US7494337B2 (en) | 2004-04-22 | 2009-02-24 | Thomas & Betts International, Inc. | Apparatus and method for providing multiple stages of fuel |
US7097448B2 (en) * | 2004-05-07 | 2006-08-29 | Peter Chesney | Vortex type gas lamp |
US7726386B2 (en) * | 2005-01-14 | 2010-06-01 | Thomas & Betts International, Inc. | Burner port shield |
CA2497378A1 (en) * | 2005-02-16 | 2006-08-16 | Alberta Welltest Incinerators Ltd. | Gas phase thermal unit |
US7789659B2 (en) * | 2006-02-24 | 2010-09-07 | 9131-9277 Quebec Inc. | Fuel injector, burner and method of injecting fuel |
EP1975506A1 (de) * | 2007-03-30 | 2008-10-01 | Siemens Aktiengesellschaft | Vorverbrennungskammer |
US20090084292A1 (en) * | 2007-09-27 | 2009-04-02 | International Environmental Solutions Corporation | Thermal Oxidizer With Enhanced Gas Mixing |
WO2011085105A2 (en) | 2010-01-06 | 2011-07-14 | The Outdoor Greatroom Company Llp | Fire container assembly |
DE102014205198A1 (de) | 2014-03-20 | 2015-09-24 | Kba-Metalprint Gmbh | Brenner und Vorrichtung zur thermischen Nachverbrennung von Abluft |
DE102014205203B3 (de) * | 2014-03-20 | 2015-05-21 | Kba-Metalprint Gmbh | Vorrichtung zur thermischen Nachverbrennung von Abluft |
DE102014205200B3 (de) | 2014-03-20 | 2015-06-11 | Kba-Metalprint Gmbh | Vorrichtung zur thermischen Nachverbrennung von Abluft |
DE102014205201A1 (de) * | 2014-03-20 | 2015-09-24 | Kba-Metalprint Gmbh | Vorrichtung zur thermischen Nachverbrennung von Abluft |
CN115704563A (zh) * | 2021-08-13 | 2023-02-17 | 北京航空航天大学 | 燃烧室和燃烧器 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2262256A1 (en) * | 1974-02-27 | 1975-09-19 | Morin Bernard | Oil burner silencer and economiser - fits over burner tip by pressing or screwing and has bell mouth |
IL93630A0 (en) * | 1989-03-27 | 1990-12-23 | Gen Electric | Flameholder for gas turbine engine afterburner |
DE59402803D1 (de) * | 1993-04-08 | 1997-06-26 | Asea Brown Boveri | Brennkammer |
CH687831A5 (de) * | 1993-04-08 | 1997-02-28 | Asea Brown Boveri | Vormischbrenner. |
US5487274A (en) * | 1993-05-03 | 1996-01-30 | General Electric Company | Screech suppressor for advanced low emissions gas turbine combustor |
US5676538A (en) * | 1993-06-28 | 1997-10-14 | General Electric Company | Fuel nozzle for low-NOx combustor burners |
DE19542918A1 (de) * | 1995-11-17 | 1997-05-22 | Asea Brown Boveri | Vorrichtung zur Dämpfung thermoakustischer Druckschwingungen |
JP4130475B2 (ja) * | 1996-09-09 | 2008-08-06 | シーメンス アクチエンゲゼルシヤフト | 空気内で燃料を燃焼する装置とその方法 |
-
1998
- 1998-11-18 EP EP98811145A patent/EP1048898B1/de not_active Expired - Lifetime
-
1999
- 1999-11-05 US US09/434,448 patent/US6196835B1/en not_active Expired - Lifetime
-
2000
- 2000-05-14 DE DE10022969A patent/DE10022969A1/de active Pending
Also Published As
Publication number | Publication date |
---|---|
US6196835B1 (en) | 2001-03-06 |
DE10022969A1 (de) | 2001-11-15 |
EP1048898A1 (de) | 2000-11-02 |
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