WO1997012180A2 - Procede et dispositif d'amelioration du comportement au demarrage d'un bruleur a diffusion d'huile - Google Patents

Procede et dispositif d'amelioration du comportement au demarrage d'un bruleur a diffusion d'huile Download PDF

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Publication number
WO1997012180A2
WO1997012180A2 PCT/DE1996/001780 DE9601780W WO9712180A2 WO 1997012180 A2 WO1997012180 A2 WO 1997012180A2 DE 9601780 W DE9601780 W DE 9601780W WO 9712180 A2 WO9712180 A2 WO 9712180A2
Authority
WO
WIPO (PCT)
Prior art keywords
fuel gas
oil
burner
nozzle
supplied
Prior art date
Application number
PCT/DE1996/001780
Other languages
German (de)
English (en)
Other versions
WO1997012180A3 (fr
Inventor
Bernd Prade
Stefan Brejora
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1997012180A2 publication Critical patent/WO1997012180A2/fr
Publication of WO1997012180A3 publication Critical patent/WO1997012180A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
    • F23D11/26—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space with provision for varying the rate at which the fuel is sprayed
    • F23D11/28—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space with provision for varying the rate at which the fuel is sprayed with flow-back of fuel at the burner, e.g. using by-pass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/42—Starting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • F23D17/002—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or liquid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/002—Supplying water

Definitions

  • the present invention relates to a method for improving the starting behavior of an oldiffusion burner with at least one atomizing nozzle for fine atomization of oil in a combustion chamber.
  • the central part namely the lance-like atomizer nozzle with its supply systems is also described in WO 90/12987. From this document it is also known that such diffusion burner nozzles can be equipped with an additional supply system for an inert substance, in particular for the supply of water. This water serves to lower the flame temperature and thus the nitrogen oxide production during load operation. However, this system is irrelevant when starting the oil burner and is therefore not required.
  • US Pat. No. 5,408,830 describes a fuel nozzle for reducing combustion instabilities in gas turbine systems with low nitrogen oxide emissions.
  • a fuel nozzle for reducing combustion instabilities in gas turbine systems with low nitrogen oxide emissions.
  • a plurality of such fuel nozzles are used in the combustion chamber to supply
  • Each fuel nozzle consists of a plurality of concentrically enclosing tubes, so that annular gaps are formed between adjacent tubes.
  • the tubes open into a nozzle head which has bores to the annular gaps or the innermost tube, which run at an angle of 45 ° with respect to the tube axis of the innermost tube.
  • the fluid fuel feasible. Air for atomizing the fluid fuel is guided in the annular gap that follows next to the outside. During the start phase of the combustion, gaseous fuel for diffusion combustion is carried in an annular gap located further out.
  • gaseous fuel is supplied for a premix combustion operation and upstream of the nozzle head is fed to the combustion air by a swirl generator downstream of a swirl generator mixes. Any fuel is ignited by a single spark plug located downstream of all fuel nozzles.
  • the object of the present invention is to improve the starting behavior of an oldiffusion burner in order to achieve properties which are similar to those of gas burners.
  • the improvement should be able to be retrofitted with the smallest possible design changes to existing systems.
  • the method according to the invention for improving the starting behavior of an oldiffusion burner with at least one atomizing nozzle for the fine atomization of oil in a combustion chamber consists in that shortly before and during the start of the
  • Oil supply a fuel gas through at least one opening near the atomizer nozzle and ignited there, whereby a support flame is generated during the start phase of the diffusion burner.
  • a support flame is particularly well suited to uniformly igniting the oil droplets, which are atomized finely enough, when the oil supply is started, and directly a stable one Generate flame on the diffusion burner.
  • the support flame is located close to the atomizer nozzle and can ignite the escaping oil mist directly.
  • the invention is particularly suitable for swirl pressure oil atomizers, ie. H. for burners to which the combustion air is supplied by an air supply system that generates a swirl.
  • air supply systems which are usually formed by a swirl blading located near the burner nozzle, are described in the cited prior art.
  • the invention is preferably suitable for known return-controlled oil diffusion burners.
  • the fuel gas supplied can be, for example, a high-calorific gas, in particular propane, butane or natural gas, depending on the availability on site.
  • the fuel gas is supplied through a plurality of openings, preferably nozzle-shaped, surrounding the atomizing nozzle, in particular if these concentrically surround the atomizing nozzle. Then there is a particularly favorably shaped support flame which can ignite the completely injected oil immediately.
  • a preferred procedure for igniting the oldiffusion burner is that an ignition flame is ignited first, which then ignites the support flame fed by the fuel gas. As soon as the support flame burns, the pilot flame can be switched off. After a short start-up phase, the support flame can also be switched off as soon as the oil diffusion burner burns stably.
  • the drawing shows a partially schematic illustration of a longitudinal section through the central parts of a return-controlled pressure oil atomizer.
  • the oil diffusion burner 1 which is shown in the drawing without the surrounding air supply system and the combustion chamber, contains as its core a lance-shaped supply system made up of several concentrically nested channels.
  • a lance-shaped supply system made up of several concentrically nested channels.
  • pressure oil reaches an annular channel 6 and from there to the atomizing nozzle 2.
  • Excess oil flows through the central oil return channel 7 to the oil return 5, in which control elements known per se are arranged.
  • an inert substance in particular water
  • the nozzle-shaped openings 3 preferably surround the atomizing nozzle 2 concentrically.
  • the openings 3 and the inert material feed 8 can be dimensioned in such a way that with conventional ones available pressures, both suitable amounts of water during normal operation and suitable amounts of fuel gas during the start-up phase.
  • the supply line 8 can optionally be connected via valves 12, 13 to a source 11 for inert substance, in particular water, and to a fuel gas source 10.
  • propane gas can be considered as the fuel gas, but natural gas or other, in particular high-calorie, fuel gases can also be used.
  • Suitable fuel gas sources are usually available anyway for the pilot burner 14 shown schematically in the vicinity of the openings 3, so that the overall effort for implementing the present invention is very low. A considerable improvement in the starting behavior and a reduction in pollutants at the start are achieved.

Landscapes

  • 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)

Abstract

Le procédé et le dispositif décrits permettent d'améliorer le comportement au démarrage d'un brûleur à diffusion d'huile (1) pourvu d'au moins un ajutage atomiseur (2) qui atomise finement l'huile dans une chambre de combustion. Immédiatement avant et pendant le début de l'amenée d'huile, un gaz de combustion est amené et allumé à travers au moins un orifice (3) à proximité de l'ajutage atomiseur (2), de façon à générer une flamme d'appui pendant la phase de démarrage du brûleur à diffusion (1). L'invention est particulièrement utile pour atomiseurs d'huile sous pression à aubes directrices, notamment pour ceux qui sont réglés en retour. On peut notamment utiliser pour amener le gaz de combustion un système d'amenée d'eau qui sert à réduire les émissions d'azote pendant la phase de démarrage. Le comportement au démarrage du brûleur à diffusion d'huile devient ainsi presque comparable à celui d'un brûleur à gaz.
PCT/DE1996/001780 1995-09-28 1996-09-19 Procede et dispositif d'amelioration du comportement au demarrage d'un bruleur a diffusion d'huile WO1997012180A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19536210 1995-09-28
DE19536210.1 1995-09-28

Publications (2)

Publication Number Publication Date
WO1997012180A2 true WO1997012180A2 (fr) 1997-04-03
WO1997012180A3 WO1997012180A3 (fr) 1997-05-09

Family

ID=7773504

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/001780 WO1997012180A2 (fr) 1995-09-28 1996-09-19 Procede et dispositif d'amelioration du comportement au demarrage d'un bruleur a diffusion d'huile

Country Status (1)

Country Link
WO (1) WO1997012180A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1031789A1 (fr) * 1999-02-23 2000-08-30 Siemens Aktiengesellschaft Brûleur à diffusion et retour d'huile et procédé de réduction de NOx d'un tel brûleur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1267897A (fr) * 1960-06-14 1961-07-28 Fourment & Laduree Brûleur universel
FR2363760A1 (fr) * 1976-09-07 1978-03-31 Holcroft & Co Bruleur a tube rayonnant
US4197076A (en) * 1978-02-13 1980-04-08 Pacific Turbo Flame Ltd. Forced draft burner
GB2131154A (en) * 1982-11-23 1984-06-13 Ex Cell O Corp Fuel injector assembly with water or auxiliary fuel capability
US5361578A (en) * 1992-08-21 1994-11-08 Westinghouse Electric Corporation Gas turbine dual fuel nozzle assembly with steam injection capability

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1267897A (fr) * 1960-06-14 1961-07-28 Fourment & Laduree Brûleur universel
FR2363760A1 (fr) * 1976-09-07 1978-03-31 Holcroft & Co Bruleur a tube rayonnant
US4197076A (en) * 1978-02-13 1980-04-08 Pacific Turbo Flame Ltd. Forced draft burner
GB2131154A (en) * 1982-11-23 1984-06-13 Ex Cell O Corp Fuel injector assembly with water or auxiliary fuel capability
US5361578A (en) * 1992-08-21 1994-11-08 Westinghouse Electric Corporation Gas turbine dual fuel nozzle assembly with steam injection capability

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1031789A1 (fr) * 1999-02-23 2000-08-30 Siemens Aktiengesellschaft Brûleur à diffusion et retour d'huile et procédé de réduction de NOx d'un tel brûleur

Also Published As

Publication number Publication date
WO1997012180A3 (fr) 1997-05-09

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