WO1992016793A1 - Bruleur a faible emission de no¿x? - Google Patents

Bruleur a faible emission de no¿x? Download PDF

Info

Publication number
WO1992016793A1
WO1992016793A1 PCT/GB1992/000436 GB9200436W WO9216793A1 WO 1992016793 A1 WO1992016793 A1 WO 1992016793A1 GB 9200436 W GB9200436 W GB 9200436W WO 9216793 A1 WO9216793 A1 WO 9216793A1
Authority
WO
WIPO (PCT)
Prior art keywords
duct
nozzle
burner
air
inlet end
Prior art date
Application number
PCT/GB1992/000436
Other languages
English (en)
Inventor
Lawrence Edward Helyer
Original Assignee
Lawrence Edward Helyer
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 Lawrence Edward Helyer filed Critical Lawrence Edward Helyer
Publication of WO1992016793A1 publication Critical patent/WO1992016793A1/fr

Links

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
    • F23C7/008—Flow control devices
    • 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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber

Definitions

  • This invention relates to burners suitable for use in a boiler or furnace to burn fuel efficiently with low NO j ⁇ emissions.
  • the fuel may be a liquid, a slurry, a pulverised solid fuel, a gas or a mixture thereof.
  • one of these known techniques may be more suitable than the other but, if the operating conditions change, the other known technique may become more important.
  • a burner has been designed to operate under one or other of the above-mentioned techniques, but it is desirable that a burner should be able to operate under either of the techniques dependent upon operating conditions.
  • a burner for a boiler or furnace comprises an outer casing which defines an elongate duct, said casing being adapted to be mounted so that the inlet end and the outlet end of the duct are outside of and inside of the boiler or furnace, respectively; means for controlling the flow of air into the inlet end of the duct; a nozzle in the duct adjacent the outlet end thereof; a flame stabiliser in the nozzle; means for injecting fuel to the flame stabiliser to be combusted; and a diverter valve in the duct, the valve being displaceable between a first position in which it directs all of the air in the duct into the nozzle and permits gases of combustion to be introduced into the inlet end of the nozzle and a second position in which it causes a portion of the air in the duct to bypass the nozzle.
  • the diverter valve is preferably mounted on means which permit the valve to be displaced to any desired position between its first and second positions so that the burner operates efficiently under all conditions.
  • the valve may be displaceable only when the burner is not in use or it may be displaceable while the burner is in use.
  • Figure 1 is a sectional side elevation of a burner in accordance with the present invention.
  • Figure 2 is a sectional plan of the burner shown in Figure 1 with the diverter valve in its first operating position;
  • Figure 3 is a sectional plan of the burner, similar to that shown in Figure 2, but with the diverter valve in its second operating position.
  • a burner for a boiler or furnace and which, in use, produces low NO-g* emissions comprises an outer casing made up of two sheet metal parts (1, 2) arranged in end-to-end overlapping relation and which together define an elongate duct.
  • the part (2) has a cylindrical portion (3) with a frusto-conical portion (4) extending outwardly from one end of the cylindrical portion.
  • the part (2) has a surrounding flange (6) secured to an annular support ring (7) which permits the outer casing to be mounted on the wall of a boiler or furnace such that the inlet end (5) of the duct is outside the boiler or furnace and the outlet end of the duct is within the boiler or furnace.
  • One end of the part (3) of the outer casing is also provided with a flange and a support plate (8) by which it can be rigidly secured by spacers (9) to a front plate assembly (10) which is attached to, or forms part of, the boiler wind box and which is not shown in detail.
  • the entry flare (5) of the part (1) is connected by connecting rods (11) which extend through the front plate assembly (10) to a pair of piston-cylinder devices (12).
  • the part (1) of the casing can be displaced from the position shown in Figure 1, where the flare end (5) is hard . against the assembly (10) to prevent air entering into the duct, to the position shown in Figures 2 and 3, where the part is spaced away from the assembly to permit air from the wind box to enter through the flare opening (5) into the duct.
  • the outlet end of the duct is defined by the divergent portion of the part (4) of the outer casing and, within this portion and spaced apart therefrom by an annular gap (13), there is an inner nozzle (14).
  • the nozzle is secured concentrically within the part (4) by a number of webs (not shown).
  • a flame stabiliser (15) is located within the nozzle and is supported at one end of an elongate tube (15A) which extends axially of the duct and passes through a sleeve in the wall structure (10).
  • the opposite end of the tube carries a liquid fuel injector (16).
  • a piston-cylinder device (17) mounted on the outside of the wall structure is connected to the tube (15A) so that, by operating the piston-cylinder device, the tube can be displaced in the direction of its length to position the flame stabiliser axially of the nozzle (14) .
  • the tube (15A) there is an additional tube (18) which is also connected to a piston-cylinder device (19) on the outer wall of the structure (10) _
  • the two tubes are thus displaceable independently of each other and the outer tube carries a diverter valve (20) within the duct.
  • This diverter valve has a larger end (21) which is of substantially the same cross-section as the cross-section of the part (3) of the outer casing and the wall of the diverter valve tapers to a smaller end (22) having a cross-section which is smaller than the cross-section of the inlet end of the nozzle (14).
  • the diverter valve By operating the piston-cylinder device (19), the diverter valve can be displaced longitudinally of the duct between a first position, shown in Figures 1 and 2, and a second position, shown in Figure 3.
  • the outer surface of the larger end (21) of the diverter valve engages the inner surface of the part (3) of the casing so that all the air passing along the duct enters into the larger end of the diverter valve and the smaller end (22) of the diverter valve is positioned adjacent the inlet end of the nozzle (14) but, since the cross-section of the smaller end of the diverter valve is less than the cross- section of the inlet end of the nozzle, there is an annular gap (23) between them.
  • the flare end (5) of the part (1) of the casing is hard-up against the wall (10), as shown in Figure 1, so that substantially no air enters the duct.
  • the piston-cylinder devices (12) are actuated to displace the part (1) of the casing away from the wall (10) to permit air to flow along the duct.
  • Gas is introduced along a gas tube/igniter (26) to the flame stabiliser where it is ignited.
  • the fuel injector (16) is actuated to spray fuel, conveniently fuel oil, into the swirling air stream generated by the flame stabiliser. The liquid fuel is ignited by the burning gas and, when injection has taken place, the supply of gas along the tube (26) is stopped.
  • the diverter valve is preset by moving the tube (18) from outside the boiler in order to obtain combustion with a minimum level of NO ⁇ emission. This usually takes place during commissioning of the boiler. However, if operating conditions change, the diverter valve can be repositioned to a position where minimum NO ⁇ emission occurs under the different operating conditions. Consequently, the burner can be set to produce low NO ⁇ emissions for all operating conditions of the boiler.
  • the invention is particularly suitable for use with liquid fuels, other fuels which can be injected into the swirling air stream generated by the flame stabiliser can be used.

Landscapes

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

Abstract

Brûleur à combustible produisant une faible émission de NOX, qui comprend un conduit (1, 2) par lequel s'effectue l'alimentation en air de combustion, une buse (14) dans le conduit et une soupape de dérivation (20) déplaçable entre une première position dans laquelle tout l'air présent dans le conduit et une proportion de gaz de combustion pénètrent dans la buse et une seconde positon dans laquelle une partie de l'air présent dans le conduit est détournée afin de ne pas pénétrer dans la buse.
PCT/GB1992/000436 1991-03-12 1992-03-11 Bruleur a faible emission de no¿x? WO1992016793A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919105204A GB9105204D0 (en) 1991-03-12 1991-03-12 Low nox burner register
GB9105204.3 1991-03-12

Publications (1)

Publication Number Publication Date
WO1992016793A1 true WO1992016793A1 (fr) 1992-10-01

Family

ID=10691421

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/000436 WO1992016793A1 (fr) 1991-03-12 1992-03-11 Bruleur a faible emission de no¿x?

Country Status (2)

Country Link
GB (1) GB9105204D0 (fr)
WO (1) WO1992016793A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002815A2 (fr) * 1978-01-03 1979-07-11 Coen Company, Inc. Dispositif pour brûler du combustible
FR2468833A1 (fr) * 1979-11-02 1981-05-08 Hague Int Bruleur a recyclage et procede de mise en application de ce bruleur
EP0139085A1 (fr) * 1983-07-30 1985-05-02 Deutsche Babcock Werke Aktiengesellschaft Procédé et brûleur pour la combustion des combustibles liquides ou gazeux avec diminution de la formation de NOx

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002815A2 (fr) * 1978-01-03 1979-07-11 Coen Company, Inc. Dispositif pour brûler du combustible
FR2468833A1 (fr) * 1979-11-02 1981-05-08 Hague Int Bruleur a recyclage et procede de mise en application de ce bruleur
EP0139085A1 (fr) * 1983-07-30 1985-05-02 Deutsche Babcock Werke Aktiengesellschaft Procédé et brûleur pour la combustion des combustibles liquides ou gazeux avec diminution de la formation de NOx

Also Published As

Publication number Publication date
GB9105204D0 (en) 1991-04-24

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