EP1601913A1 - Bruleur de premelange - Google Patents

Bruleur de premelange

Info

Publication number
EP1601913A1
EP1601913A1 EP04716606A EP04716606A EP1601913A1 EP 1601913 A1 EP1601913 A1 EP 1601913A1 EP 04716606 A EP04716606 A EP 04716606A EP 04716606 A EP04716606 A EP 04716606A EP 1601913 A1 EP1601913 A1 EP 1601913A1
Authority
EP
European Patent Office
Prior art keywords
flow
combustion air
premix burner
burner
combustion
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.)
Withdrawn
Application number
EP04716606A
Other languages
German (de)
English (en)
Inventor
Valter Bellucci
Francois Meili
Christian Oliver Paschereit
Bruno Schuermans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Technology GmbH
Original Assignee
Alstom Technology AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alstom Technology AG filed Critical Alstom Technology AG
Publication of EP1601913A1 publication Critical patent/EP1601913A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
    • F23M20/005—Noise absorbing means
    • 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
    • F23R3/002—Wall structures
    • 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
    • F23R2900/00014—Reducing thermo-acoustic vibrations by passive means, e.g. by Helmholtz resonators

Definitions

  • the present invention relates to a premix burner according to the preamble of claim 1.
  • lean premix burners are predominantly used in modern gas turbine technology.
  • the most varied types of lean premix burners are, for example, from US Pat. No. 4,781,030
  • EP 321 809, EP 780 629, WO 93/17279, EP 945 677 or WO 00/12936 are known. These burners essentially work on the principle of introducing fuel into a highly swirled air stream, in which it forms a homogeneous mixture with the combustion air. The ignition and flame stabilization take place by the swirl flow bursting at the burner outlet, ie at the burner mouth to the combustion chamber. These burners are preferably operated with a sub-stoichiometric fuel-air ratio, typically with air ratios around 2. The formation of stochiometric zones with hot spots in the flame, in which a high nitrogen oxide production takes place, is avoided in this way, and the good premixing usually also leads to a good burnout achieved.
  • pilot stages or pilot burners are therefore used, via which additional fuel is introduced into the combustion chamber in certain operating areas.
  • thermoacoustic vibrations in the combustion chamber.
  • These undesirable vibrations can be reduced on the one hand by appropriate control of the fuel supply and the fuel distribution, and on the other hand by steaming measures within the combustion chamber.
  • US Pat. No. 5,685,157 discloses an acoustic steamer for a combustion chamber, which is formed by a plurality of resonance tubes which are connected to the combustion chamber via a perforated plate. These resonance tubes serve as Helmholtz resonators, which, depending on the size of the resonance volume, dampen individual thermoacoustic vibrations.
  • US 5,431,018 also shows the use of
  • Burners have a minimal acoustic impedance. Part of this cooling air is then mixed with the fuel in the burner and reaches the burner outlet the combustion chamber for combustion. Helmholtz resonators can achieve very high attenuations, but only in a very narrow frequency range to which the resonance volume is matched. They are especially for steaming individuals
  • Vibrations in the low frequency range are suitable, in which the frequency spacing between the unwanted vibrations is relatively large.
  • high-frequency and closely adjacent vibrations can also occur in a broad frequency range due to so-called combustion chamber pulsations, which endanger the quality of the combustion process and also the structural integrity of the plants.
  • Helmholtz resonators are hardly suitable for damping such broadband vibrations.
  • the object of the present invention is therefore to provide a premix burner of the type mentioned at the outset in such a way that the disadvantages of the prior art are avoided.
  • the premix burner should be specified in such a way that the burner at the same time enables acoustic combustion chamber pulsations to be damped during operation.
  • the problem is solved with the premix burner according to claim 1.
  • Advantageous refinements of the subject matter of the invention are the subject of the subclaims or result from the following description and the exemplary embodiments.
  • the essence of the invention therefore, is to arrange a first perforated throughflow element in the inflow area for the combustion air, and a second throughflow element with a well-defined distance, in a premix burner, which is particularly suitable for a gas turbine system and which comprises a swirl generator for a combustion air stream flowing to the burner to be arranged upstream of the first flow element from the first flow element.
  • the objectives according to the invention are most efficiently achieved if the flow-through elements are arranged in such a way that essentially the entire combustion air flow must flow through the flow-through elements.
  • the burner is designed such that the first flow element is a hollow cylinder and the second flow element is a hollow cylinder surrounding the first flow element. These two hollow cylinders are preferably arranged coaxially.
  • the swirl generator is arranged within the first hollow cylinder. The end faces of the burner are then most advantageously designed and closed such that between the
  • the swirl generator comprises a plurality, in particular two or four, of partial bodies, which in a preferred embodiment essentially have the shape of Have truncated cone sections, and between which side inlet slots are formed for the supply of combustion air.
  • the longitudinal axes of the individual partial bodies are laterally offset from one another.
  • Perforation levels to adjust acoustic damping can be avoided. This means that the degree of perforation of one of the flow elements can be changed and adapted to special requirements without the pressure drop or
  • the second throughflow element arranged upstream can be designed to match the desired acoustic damping with a suitable degree of perforation in order to achieve maximum acoustic damping in a specific one
  • Frequency range The pressure drop is set by the first flow element.
  • a damping of these acoustic vibrations can be achieved by a suitable design of the flow-through elements depending on the combustion chamber pulsations that occur or are to be avoided during operation of a combustion chamber with the premix burner.
  • the perforated flow-through elements act as an acoustically steaming wall in the plane of the burner outlet, whereby in the plane of the burner outlet taking into account the combustion air speed occurring during operation. the reflection-free condition for sound impedance is fulfilled.
  • the flow elements are preferably matched to one another by changes in the degree of perforation, the thickness and also their spacing from one another such that at least when the burner is operated as intended, the first flow element arranged downstream reflects the acoustic vibrations at least approximately completely; the second flow-through element is designed such that it effects maximum damping of the acoustic vibrations.
  • Sound impedance can in particular be met in that the distance of the first flow-through element from the second flow-through element, the degree of perforation of the flow-through elements, and the extent of the flow-through elements in the flow-through direction are coordinated with one another in such a way that the complex sound impedance is characteristic of the
  • Pulsation frequencies of the burner at least approximately corresponds to the product of the density of the combustion air and the speed of sound in the combustion air.
  • the distance of the first flow-through element from the second is preferred
  • the first flow element arranged downstream is advantageously designed such that the ratio of the degree of perforation to the pressure loss coefficient of the first flow element corresponds at least approximately to the Mach number of the combustion air flowing through.
  • the degree of perforation is defined here as the ratio of the free flow cross-section to the total cross-section of a perforated element.
  • Premix burner some of the combustion chamber pressure fluctuations are absorbed and thus steamed.
  • the perforated flow elements act as an acoustic damping element.
  • the real part R of the complex sound impedance Z is referred to as resistance, the imaginary part X as reactance.
  • Geometry also plays a role here of the burner between the housing wall and the burner outlet level. Maintaining a flow of combustion air through the perforated section during operation of the combustion chamber results in different conditions than without such a gas flow. Without a gas flow, the resistance would be non-linear due to the dependence on the convection and dissipation of the acoustically generated vortices, so that it would be very difficult to adjust. In the present case, the constant leads
  • Flow-through element is used to adjust the reactance X with respect to the frequencies to be steamed.
  • the downstream element serves as a fully reflective wall (without damping) for the acoustic pressure vibrations. This is made possible by the fact that the pressure drop between the first and the second flow elements is split, so that the acoustic areas upstream and downstream of the flow elements are acoustically decoupled from one another.
  • the reactance X can be made approximately zero with respect to the frequency to be steamed through flow elements.
  • the flow-through elements consist of solid, non-porous components into which are known per se Wise openings, perforations for which combustion air is introduced.
  • the perforation is introduced into the flow-through elements by machining, for example by drilling.
  • a sheet metal blank of suitable thickness is brought into the desired shape by bending or pressing, and the flow openings are introduced into the blanks by a subsequent manufacturing process, in particular by drilling.
  • a perforated sheet can also be used from the start.
  • a blank is brought into a suitable basic shape by a primary molding process, for example casting or sintering, and the perforation openings are then introduced. Through-flow openings can also be formed during primary shaping.
  • the burner according to the invention can have a geometric shape and a structure, as is known from known premix burners of the prior art.
  • a type of burner is preferred in which the swirl body is composed of several conical section-shaped partial shells, between which time entry slots are formed for the combustion air.
  • Such a burner is known, for example, from US 4,932,861.
  • the burner according to the invention is suitable for use in combustion devices, and in particular for use in combustion chambers of gas turbine groups.
  • Fig. La shows an example of the size of the reflection coefficient r of a plate with a degree of perforation of 2.5% without a fixed flow through the individual perforation holes;
  • FIG 3 shows a combustion chamber which comprises a burner according to the invention.
  • Figures 1 and 2 show a comparison of the effect of a perforated plate as used as the perforated section of the present burner, with and without the constant flow of combustion air according to the present invention.
  • the solid lines in FIGS. 1 and 2 show the values calculated according to a numerical model, the rectangular boxes measured values. The calculations and measurements were carried out with a perforated plate with a perforation degree of 2.5%.
  • the maximum absorption results here for the resonance frequency which is characterized in the representation of the phase of the reflection coefficient by the phase jump.
  • the figures show the good agreement of the calculated with the measured values, so that the model used is very well suited for the dimensioning of such perforated sections.
  • FIG. 2 shows the conditions as prevailing in the present combustion chamber, in which a constant flow of combustion air is maintained through the perforated sections. This flow enables better adjustment of the
  • the second flow-through element in the present case the outer hollow cylinder 11, is designed for maximum acoustic damping.
  • the burner according to the invention has a number of advantages.
  • the arrangement of the flow elements means that
  • combustion chamber 7 combustion chamber, combustion chamber

Landscapes

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

Abstract

L'invention concerne un brûleur de prémélange comportant un générateur de tourbillon (4), caractérisé en ce que deux éléments de passage perforés (10, 11) disposés à un écart défini l'un par rapport à l'autre, sont logés dans la zone d'admission d'air de combustion (3). Les éléments de passage sont de préférence disposés de telle manière que l'essentiel du flux d'air de combustion doit parcourir les éléments de passage. Dans un mode de réalisation préféré, le degré de perforation des éléments de passage et leur écart l'un par rapport à l'autre sont définis de telle manière qu'il n'y a pas de réflexion des éventuelles fréquences de pulsation de combustion à la sortie du brûleur (1), dans la chambre de combustion (7).
EP04716606A 2003-03-07 2004-03-03 Bruleur de premelange Withdrawn EP1601913A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH3632003 2003-03-07
CH3632003 2003-03-07
PCT/EP2004/050243 WO2004079264A1 (fr) 2003-03-07 2004-03-03 Bruleur de premelange

Publications (1)

Publication Number Publication Date
EP1601913A1 true EP1601913A1 (fr) 2005-12-07

Family

ID=32932308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04716606A Withdrawn EP1601913A1 (fr) 2003-03-07 2004-03-03 Bruleur de premelange

Country Status (3)

Country Link
US (1) US7424804B2 (fr)
EP (1) EP1601913A1 (fr)
WO (1) WO2004079264A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8479720B1 (en) 2008-10-16 2013-07-09 Oscar Enrique Figueroa Heating device and method
US9127837B2 (en) 2010-06-22 2015-09-08 Carrier Corporation Low pressure drop, low NOx, induced draft gas heaters

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GB1274343A (en) 1970-02-24 1972-05-17 Rolls Royce Improvements in or relating to acoustic linings
US3831710A (en) 1973-01-24 1974-08-27 Lockheed Aircraft Corp Sound absorbing panel
US4141213A (en) * 1977-06-23 1979-02-27 General Motors Corporation Pilot flame tube
EP0210462B1 (fr) 1985-07-30 1989-03-15 BBC Brown Boveri AG Chambre de combustion double
CH674561A5 (fr) 1987-12-21 1990-06-15 Bbc Brown Boveri & Cie
US5307634A (en) 1992-02-26 1994-05-03 United Technologies Corporation Premix gas nozzle
DE59208193D1 (de) 1992-07-03 1997-04-17 Abb Research Ltd Nachbrenner
US5353958A (en) 1993-04-30 1994-10-11 The Coca-Cola Company Carbonated beverage dispenser with constant temperature mixing valve
DE19516798A1 (de) 1995-05-08 1996-11-14 Abb Management Ag Vormischbrenner mit axialer oder radialer Luftzuströmung
US5685157A (en) 1995-05-26 1997-11-11 General Electric Company Acoustic damper for a gas turbine engine combustor
DE19547913A1 (de) 1995-12-21 1997-06-26 Abb Research Ltd Brenner für einen Wärmeerzeuger
US5782082A (en) * 1996-06-13 1998-07-21 The Boeing Company Aircraft engine acoustic liner
US6106276A (en) * 1996-09-10 2000-08-22 National Tank Company Gas burner system providing reduced noise levels
DE59709155D1 (de) * 1997-07-15 2003-02-20 Alstom Switzerland Ltd Vorrichtung zur Dämpfung von Brennkammerschwingungen
DE19737998A1 (de) * 1997-08-30 1999-03-04 Abb Research Ltd Brennervorrichtung
DE69916911T2 (de) * 1998-02-10 2005-04-21 Gen Electric Brenner mit gleichmässiger Brennstoff/Luft Vormischung zur emissionsarmen Verbrennung
US6178752B1 (en) 1998-03-24 2001-01-30 United Technologies Corporation Durability flame stabilizing fuel injector with impingement and transpiration cooled tip
EP0971172B1 (fr) * 1998-07-10 2003-12-03 ALSTOM (Switzerland) Ltd Chambre de combustion pour turbine à gaz avec paroi à structure silencieuse
DE19839085C2 (de) 1998-08-27 2000-06-08 Siemens Ag Brenneranordnung mit primärem und sekundärem Pilotbrenner
JP2002195565A (ja) * 2000-12-26 2002-07-10 Mitsubishi Heavy Ind Ltd ガスタービン燃焼器
DE60135436D1 (de) * 2001-01-09 2008-10-02 Mitsubishi Heavy Ind Ltd Gasturbinenbrennkammer
JP4508474B2 (ja) * 2001-06-07 2010-07-21 三菱重工業株式会社 燃焼器
GB2390150A (en) * 2002-06-26 2003-12-31 Alstom Reheat combustion system for a gas turbine including an accoustic screen

Non-Patent Citations (1)

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Title
See references of WO2004079264A1 *

Also Published As

Publication number Publication date
WO2004079264A1 (fr) 2004-09-16
US20060101825A1 (en) 2006-05-18
US7424804B2 (en) 2008-09-16

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