WO2001018449A9 - Lmf - Google Patents

Lmf

Info

Publication number
WO2001018449A9
WO2001018449A9 PCT/US2000/024852 US0024852W WO0118449A9 WO 2001018449 A9 WO2001018449 A9 WO 2001018449A9 US 0024852 W US0024852 W US 0024852W WO 0118449 A9 WO0118449 A9 WO 0118449A9
Authority
WO
WIPO (PCT)
Prior art keywords
combustion zone
fuel
igniter
combustion
outer casing
Prior art date
Application number
PCT/US2000/024852
Other languages
English (en)
Other versions
WO2001018449A1 (fr
Inventor
Thomas J Holley
Ruben J Martin
Original Assignee
Forney Corp
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 Forney Corp filed Critical Forney Corp
Publication of WO2001018449A1 publication Critical patent/WO2001018449A1/fr
Publication of WO2001018449A9 publication Critical patent/WO2001018449A9/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
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/101—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet
    • F23D11/102—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D91/00—Burners specially adapted for specific applications, not otherwise provided for
    • F23D91/02—Burners specially adapted for specific applications, not otherwise provided for for use in particular heating operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2209/00—Safety arrangements
    • F23D2209/20—Flame lift-off / stability

Definitions

  • This invention relates to burner igniters and more particularly to oil fired igniters designed to maintain a stable continuous pilot flame.
  • transient conditions in the boiler or other application may cause the igniter flame to go out.
  • the reliability of the igniter in being able to maintain a continuous pilot flame is the function of the environment in which the igniter is used.
  • igniters and, in particular, oil fired igniters that maintain a stable, continuous pilot flame under adverse transient environmental conditions.
  • the igniter of the present invention implements a two-step ignition process with two combustion zones being defined by the igniter.
  • the primary combustion zone is located at the tip of the igniter and a secondary combustion zone is situated in a protected location within the igniter.
  • a spark ignites combustion at the secondary combustion zone in the protected location and flame is propagated from the protected location to the primary combustion zone at the igniter tip to maintain a continuous flame at the tip.
  • the secondary combustion zone is protected within the igniter, it is not affected by transient conditions external to the igniter and, thus, combustion in this zone will be maintained.
  • a principal advantage of the invention is achieved as the burner is not susceptible to flame out due to external transient conditions around the igniter.
  • the fuel oil is atomized at the proximal end of the igniter and is carried to the tip of the igniter in atomized form.
  • a portion of the atomized mixture is projected backwardly into the igniter to the secondary combustion zone where it is ignited by an electric spark.
  • the atomized oil and fuel mixture is also projected outwardly from the nozzle of the igniter in the primary combustion zone in which the continuous pilot flame is generated. The igniter is not subject to flame out because the secondary combustion zone is protected from transient conditions and combustion in the secondary combustion zone will maintain a flame at the primary combustion zone in the tip of the igniter.
  • Fig. 1 is an axial sectional view of an igniter of the present invention
  • Fig. 2 is an exploded isometric view of the igniter of Fig. 1;
  • Fig. 3 is an enlarged a side view in elevation of the assembly of the fuel tube and baffle of the igniter of Fig. 1 ;
  • Fig. 4 is an end view in elevation of the assembly of the fuel tube and baffle of Fig. 3;
  • Fig. 5 is an enlarged axial sectional view of the nozzle at the tip of the fuel tube;
  • Figs. 6 and 7 are isometric views of the proximal end of the igniter where atomization takes place;
  • Fig. 8 is an axial sectional view through the proximal end of the igniter, showing the atomization chamber for atomizing the fuel oil for the igniter;
  • Fig. 9 is an enlarged side view in elevation of the spark rod tip used in the igniter; and Fig. 10 is an end view in elevation of the spark rod tip of Fig. 9.
  • the igniter comprises an outer casing 11 along the central axis of which is mounted a fuel tube 13 which extends from the proximal end 15 of the igniter to the distal end 17 of the igniter at which the pilot flame is generated for igniting a burner.
  • fuel oil is introduced radially into an atomization chamber 19 at the proximal end of the igniter.
  • Atomizing air under pressure is introduced axially into the chamber and is redirected to flow transversely to the inflowing fuel oil. The velocity of the atomizing air and its transverse direction to the inflowing fuel oil creates a shearing action which generates tiny droplets of fuel that are suspended in the air flow.
  • the mixture of air and fuel as droplets flows down the fuel tube 13 to the nozzle 21 near the distal end 17 of the fuel tube 13.
  • the atomizing of the fuel oil into tiny droplets increases the surface area of the fuel oil facilitating complete combustion of the fuel oil when it is ignited.
  • the atomized fuel oil droplets remain in suspension while traveling throughout the length of the fuel tube 13.
  • atomized fuel oil and air mixture is projected forwardly out of the tip end of the igniter through passageways 23.
  • One of the passageways 23 is oriented axially in the tip and additional passageways 23 are oriented at various angles with respect to the axis.
  • a small part of the atomized fuel mixture is directed backwardly from the nozzle 21 through passageways 25 to the secondary combustion zone spaced inwardly from the distal end 17 of the casing 11.
  • the atomized oil and fuel mixture is ignited by a spark produced by the spark rod 27 at the secondary combustion zone.
  • the spark is produced by a high voltage at the tip of the spark rod 27 across the gap between the center core 28 and the outer core 29 of the spark tip, as shown in Fig. 10.
  • the spark rod 27, as shown in Fig. 2, is positioned near to the inner surface of the cylindrical casing 11.
  • the spark generated at the tip of the spark rod the flame will propagate to the fuel mixture being projected outwardly through the passageways 23 and thus provide the pilot flame projecting from the tip of the igniter in the primary combustion
  • baffle plate 31 Just upstream of the secondary combustion zone is a baffle plate 31 shown in Figs. 3 and 4.
  • the fuel tube 13 passes axially through the center of the baffle plate 31, and the baffle plate 31, which is shown as a generally circular shape, is centered within the casing 11 by means of tabs 33, which provide having an annular gap between the baffle plate 31 and the outer casing 11.
  • the tip of the spark tube is situated in one of two U-shaped openings 35 in the periphery of the baffle plate 31. Cooling air is introduced under low pressure through inlet 37 (Fig. 1) into the space between the fuel tube 13 and the outer casing 11. The cooling air flows around the edge of the baffle plate 31 to the secondary combustion zone.
  • one of the U-shaped openings 35 in the periphery of the baffle plate 31 receives the tip of the spark rod 27.
  • the other U-shaped opening 35 receives a viewing tube, not shown, which extends from the proximal end 15 of the igniter to the secondary combustion zone and enables an observer to view of the presence of a flame being generated by the igniter.
  • the location of the secondary combustion zone, spaced inwardly from the distal end 17 of the igniter within the cylindrical casing 11, enables combustion to be maintained in this protected secondary combustion zone in the presence of adverse transient conditions at the tip of the igniter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)

Abstract

L'invention porte sur un allumeur de brûleur maintenant une flamme pilote stable et continue et comportant: un boîtier extérieur (11) présentant une entrée et une sortie, et une buse (21) émettant un mélange d'air et de combustible. La buse (21) voisine de la sortie du boîtier extérieur (11) maintient la combustion dans une première zone proche de la sortie. L'allumeur maintient également la combustion dans une deuxième zone du boîtier extérieur (11) protégée des états transitoires. La deuxième zone de combustion est voisine de la première mais en retrait de la sortie, ainsi la combustion de la première zone maintient-elle la combustion dans la première.
PCT/US2000/024852 1999-09-10 2000-09-11 Lmf WO2001018449A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15303899P 1999-09-10 1999-09-10
US60/153,038 1999-09-10

Publications (2)

Publication Number Publication Date
WO2001018449A1 WO2001018449A1 (fr) 2001-03-15
WO2001018449A9 true WO2001018449A9 (fr) 2002-10-10

Family

ID=22545521

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/024852 WO2001018449A1 (fr) 1999-09-10 2000-09-11 Lmf

Country Status (1)

Country Link
WO (1) WO2001018449A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015181762A1 (fr) 2014-05-28 2015-12-03 Siti - B&T Group S.P.A. Dispositif brûleur pour fours et four muni d'un tel dispositif

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1830159A (en) * 1927-01-12 1931-11-03 Cleveland Heater Co Gas burner
FR1113038A (fr) * 1954-02-23 1956-03-22 Cie Belge Des Freins Westingho Dispositif d'allumage pour brûleurs à huile à coupelle de pulvérisation centrifuge
DE2129516B2 (de) * 1971-06-15 1973-09-27 Joh. Vaillant Kg, 5630 Remscheid Sicherheitseinrichtung für einen Hauptgasbrenner
US3850571A (en) * 1972-11-10 1974-11-26 Zink Co John High energy flame burner
GB8307687D0 (en) * 1983-03-19 1983-04-27 Gkn Birwelco Ltd Flares
US5513981A (en) * 1991-11-22 1996-05-07 Aichelin Gmbh Burner with variable volume combination chamber
US5305735A (en) * 1993-03-29 1994-04-26 Welden David P Direct fired hot water generator with more than one heat exchange zone

Also Published As

Publication number Publication date
WO2001018449A1 (fr) 2001-03-15

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