US3897199A - Burner assembly having a tertiary air nozzle - Google Patents

Burner assembly having a tertiary air nozzle Download PDF

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Publication number
US3897199A
US3897199A US486254A US48625474A US3897199A US 3897199 A US3897199 A US 3897199A US 486254 A US486254 A US 486254A US 48625474 A US48625474 A US 48625474A US 3897199 A US3897199 A US 3897199A
Authority
US
United States
Prior art keywords
sleeve
air
assembly
opening
end portion
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
Application number
US486254A
Other languages
English (en)
Inventor
Walter P Grozegno
Norman K Trozzi
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.)
Foster Wheeler Inc
Original Assignee
Foster Wheeler Inc
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 Foster Wheeler Inc filed Critical Foster Wheeler Inc
Priority to US486254A priority Critical patent/US3897199A/en
Priority to CA224,245A priority patent/CA1024434A/en
Priority to JP50057167A priority patent/JPS515635A/ja
Priority to GB22495/75A priority patent/GB1506777A/en
Priority to ES439174A priority patent/ES439174A1/es
Application granted granted Critical
Publication of US3897199A publication Critical patent/US3897199A/en
Priority to JP1980084967U priority patent/JPS5827216Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • F23C7/006—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes adjustable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion simultaneously or alternately of gaseous or liquid or pulverulent fuel
    • F23D17/002—Burners for combustion simultaneously or alternately of gaseous or liquid or pulverulent fuel gaseous or liquid fuel

Definitions

  • ABSTRACT A burner assembly for mounting adjacent an opening in the wall of a furnace, including at least one fuel burner member disposed in a sleeve having an end portion terminating adjacent the opening.
  • a first supply of combustion air for the fuel is directed from a location external of the sleeve toward the opening and a second supply of combustion air is introduced into the sleeve.
  • a cup shaped insert is disposed in the sleeve for defining a nozzle having an annular discharge opening for discharging the second supply of air towards the stream of fuel discharging from the burner member.
  • FIG. 1 A first figure.
  • This invention relates to a burner assembly for use in a furnace or the like and, more particularly, to such an assembly in which two separate supplies of combustion air are directed toward the fuel stream discharging from a burner member.
  • combustion air for the burner is discharged from a windbox towards the combustion zone, which is usually located in, or immediately adjacent to, an opening in the furnace wall.
  • This air is commonly referred to as secondary air and usually comprises all, or at least a very large percentage of the total combustion air requirements for the burner.
  • an additional supply of air commonly referred to as tertiary air, is introduced through the interior of the burner assembly for discharge towards the combustion zone This tertiary air supplies a relatively low percentage of the complete combustion air requirements for the burner such as, for example, 1 percent.
  • a spin is often imparted to the secondary air passing from the windbox towards the opening in the furnace wall in the vicinity of the fuel burner member in order to increase its turbulence and produce a hotter combustion zone.
  • a low pressure zone is created in the immediate vicinity of the burner tip to increase flame stability in this area.
  • the tertiary air is normally routed either directly into one end of the sleeve or from a duct connecting the windbox to the sleeve and passes directly through the sleeve to the low pressure zone for aiding combustion in this zone.
  • the burner assembly of the present invention comprises a sleeve having an end portion terminating adjacent said opening, at least one fuel burner member disposed in said sleeve and adapted to discharge a stream of fuel towards said opening, means for introducing a second supply of combustion air for said fuel into said sleeve for discharge from said end portion towards said opening, and means cooperating with said sleeve for directing said second supply of air from said sleeve towards said fuel stream.
  • FIG. 1 is a vertical sectional view depicting a burner assembly incorporating features of the present invention.
  • FIGS. 2 and 3 are enlarged sectional views taken along the lines 2-2 and 33, respectively, of FIG. 1 and incorporating an alternate feature of the present invention.
  • a casing wall 12 cooperates with the fin tube wall 10 to define an interior portion 14, it being understood that the latter is bounded by upper and lower walls, as viewed in FIG. 1, to define an enclosure, or windbox, which receives air from a source, such as a fan (not shown), with the direction of the air flow being shown in general by the solid flow arrows in FIG. 1.
  • a source such as a fan (not shown)
  • An annular refractory collar 16 extends in an opening formed in the fin tube wall 10 with its inner surface being shaped to define a throat portion surrounding a combustion zone 18.
  • a burner assembly shown in general by the reference numeral 20, extends through the casing wall 12, with one end of the assembly terminating substantially near the leading end of the collar 16.
  • the burner assembly 20 is supported in a coaxial relationship to the collar 16 by the casing wall 12 and by a register assembly fixed relative to the collar and shown in general by the reference numeral 22.
  • the latter assembly 22 is formed by a pair of spaced plates 24 and 26 having central openings formed therein through which the burner assembly 20 extends.
  • the central opening in the plate 24 is sized so as to support the burner assembly 20 with a minimum clearance, while the central opening in the plate 26 is larger than the outer diameter of the burner assembly to permit air flow, as will be described in detail.
  • a plurality of vanes 28 are journalled between the two plates 24 and 26 of the register assembly 22 for pivotal movement with respect thereto. Although only two 'vanes 28 are shown in FIG. 1, it is understood that several additional vanes are disposed in a circular relationship around the burner assembly 20. Although not shown in the drawings, it is understood that the angular position of the vanes 28 may be adjustable by cranks or the like, in order to direct the air in a particular path through the register assembly 22 and through the enlarged central opening in the plate 26 to the combustion zone 18.
  • the burner assembly comprises an outer tubular sleeve 30 having its leading end portion 30a bent radially inwardly.
  • a plurality of spaced openings 32 are formed through the wall of the sleeve 30 for emitting air from the windbox 14 into the interior of the sleeve.
  • a primary fuel gun, or burner, 34 is supported within the sleeve 30 in a coaxial relationship thereto and is adapted to discharge a stream of fuel towards the combustion zone 18 in a substantially conically shaped discharge pattern as shown by the dashed flow arrows in FIG. 1.
  • a plurality of auxiliary fuel guns, or burners, 36 are disposed in a radially spaced relationship from the gun 34 and extend along a circle as better shown in FIGS. 2 and 3. These guns are for the purpose of discharging another fuel towards the combustion zone 18 which can serve as a primary fuel or as a startup, or auxiliary, fuel.
  • oil could be used in the gun 34 as a primary fuel, and gas could be used in the guns 36 for the purpose of burning in conjunction with the oil.
  • an igniter gun and a flame detector, or scanner can also be supported in the sleeve 20, for operation in a conventional manner.
  • a substantially cup-shaped insert 40 is disposed within the leading end portion of the sleeve 30 and includes an inwardly bent wall portion 40a extending slightly divergent to the wall portion 30a of the sleeve 30, to define a discharge nozzle portion having an annular flow and discharge path for the air admitted into the sleeve 30 through the openings 32.
  • a plurality of web portions 42 connect the insert 40 to the gun support sleeve 34a for the purpose of supporting the insert within the sleeve 30.
  • a plurality of openings 44 extend through the base portion of the insert 40 for allowing a small portion of air entering the interior of the sleeve 30 through the openings 32 to bleed directly to the combustion zone 18.
  • the angular position of the vanes 28 may be adjusted to impart a spin to the air passing from the windbox 14 through the register assembly 22 and the opening in the plate 26 to the combustion zone 18.
  • a vortex is created in the central portion of the combustion zone to define a low pressure area for the flame resulting from ignition of the fuel discharging from the gun 34.
  • a large percentage of the air passing through the openings 32 into the sleeve 30 passes through the annular discharge opening of the nozzle defined between the cooperating wall portions 30a and 40a of the sleeve and insert 30 and 40, respectively, and towards the central or axial portion of the fuel discharge pattern from the gun 34.
  • the ignition of the fuel from the gun 34 starts at the outside of the flame envelope in the combustion zone 18 and doesnt burn completely out until the fuel is further out into the furnace. As a result, a longer and more even burning of the fuel is achieved, which further contributes to a lower flame temperature and a reduction of nitric oxides.
  • a plurality of swirl vanes shown in FlGS. 2 and 3 by the dashed lines and by the reference numerals 50, can be provided to impart a swirling effect to the tertiary air discharging from the nozzle defined between the wall portions 30a and 40a of the sleeve 30 and insert 40, respectively.
  • the swirl vanes are disposed between the wall portions 30a and 40a and extend at an acute angle with respect to the axis of the assembly.
  • a burner assembly for mounting adjacent an opening in the wall of a furnace, comprising a collar having one end portion extending in said wall opening, another end portion located externally of said furnace, and a through opening communicating with the interior of said furnace, a sleeve disposed externally of said furnace and having an end portion cooperating with said other end portion of said collar to define a first annular flow passage communicating with said collar opening, a substantially cup-shaped insert disposed in said sleeve with the base of said insert disposed inwardly from said end portion of said sleeve and having a plurality of openings extending therethrough, the wall of said insert cooperating with said end portion of said sleeve to define a second annular flow passage communicating with said collar opening, at least one burner member disposed in said sleeve and adapted to discharge a stream of fuel into said collar opening, and windbox means surrounding said end portion of said sleeve and communicating with said first flow passage for receiving air and directing same to said first flow passage for passage to said collar opening,
  • a first burner member extends in a coaxial relationship with said sleeve and a plurality of additional burner members are disposed in a radially spaced relationship to said first burner member and are spaced along a circle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
US486254A 1974-07-05 1974-07-05 Burner assembly having a tertiary air nozzle Expired - Lifetime US3897199A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US486254A US3897199A (en) 1974-07-05 1974-07-05 Burner assembly having a tertiary air nozzle
CA224,245A CA1024434A (en) 1974-07-05 1975-04-09 Burner assembly having a tertiary air nozzle
JP50057167A JPS515635A (enrdf_load_stackoverflow) 1974-07-05 1975-05-14
GB22495/75A GB1506777A (en) 1974-07-05 1975-05-23 Burner assembly having a tertiary air nozzle
ES439174A ES439174A1 (es) 1974-07-05 1975-07-04 Perfeccionamientos en conjuntos de quemadores para hornos o aparatos similares.
JP1980084967U JPS5827216Y2 (ja) 1974-07-05 1980-06-19 バ−ナ−アセンブリ−

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US486254A US3897199A (en) 1974-07-05 1974-07-05 Burner assembly having a tertiary air nozzle

Publications (1)

Publication Number Publication Date
US3897199A true US3897199A (en) 1975-07-29

Family

ID=23931183

Family Applications (1)

Application Number Title Priority Date Filing Date
US486254A Expired - Lifetime US3897199A (en) 1974-07-05 1974-07-05 Burner assembly having a tertiary air nozzle

Country Status (5)

Country Link
US (1) US3897199A (enrdf_load_stackoverflow)
JP (2) JPS515635A (enrdf_load_stackoverflow)
CA (1) CA1024434A (enrdf_load_stackoverflow)
ES (1) ES439174A1 (enrdf_load_stackoverflow)
GB (1) GB1506777A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5408943A (en) * 1992-01-27 1995-04-25 Foster Wheeler Energy Corporation Split stream burner assembly
CN101581449B (zh) * 2009-06-25 2010-12-29 上海应用技术学院 一种生物质气天然气混烧低NOx烧嘴及其应用

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2190741A2 (en) * 1972-06-30 1974-02-01 Anvar Removing emulsified oil from water - using fluidised oleophilic resin and by mechanical disaggregation
JPS543363A (en) * 1977-06-08 1979-01-11 Agency Of Ind Science & Technol Disposal of emulsion-type drained water
JPS5436211U (enrdf_load_stackoverflow) * 1977-08-15 1979-03-09
JPS5871082U (ja) * 1981-11-04 1983-05-14 三菱重工業株式会社 クレン
US4523530A (en) * 1982-02-26 1985-06-18 Sumitomo Metal Industries, Ltd. Powdery coal burner
JPH0312878U (enrdf_load_stackoverflow) * 1989-06-21 1991-02-08
GB9025787D0 (en) * 1990-11-27 1991-01-09 Baxi Partnership Ltd Gas-fired appliances
CN102506419A (zh) * 2011-09-30 2012-06-20 哈尔滨工业大学 一种墙式布置的两级燃尽风装置
CN103185342B (zh) * 2013-04-03 2015-09-30 大唐韩城第二发电有限责任公司 一种油气复合燃烧器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576384A (en) * 1968-11-29 1971-04-27 British American Oil Co Multinozzle system for vortex burners
US3715181A (en) * 1971-01-26 1973-02-06 Zink Co John Fuel burner assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4523712Y1 (enrdf_load_stackoverflow) * 1967-08-11 1970-09-18
JPS4945125U (enrdf_load_stackoverflow) * 1972-07-22 1974-04-20
US3765824A (en) * 1972-08-02 1973-10-16 Foster Wheeler Corp Apparatus for determining air flow to a gas burner
JPS4945433A (enrdf_load_stackoverflow) * 1972-09-07 1974-04-30

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576384A (en) * 1968-11-29 1971-04-27 British American Oil Co Multinozzle system for vortex burners
US3715181A (en) * 1971-01-26 1973-02-06 Zink Co John Fuel burner assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5408943A (en) * 1992-01-27 1995-04-25 Foster Wheeler Energy Corporation Split stream burner assembly
CN101581449B (zh) * 2009-06-25 2010-12-29 上海应用技术学院 一种生物质气天然气混烧低NOx烧嘴及其应用

Also Published As

Publication number Publication date
GB1506777A (en) 1978-04-12
JPS564711U (enrdf_load_stackoverflow) 1981-01-16
ES439174A1 (es) 1977-02-16
JPS5827216Y2 (ja) 1983-06-13
JPS515635A (enrdf_load_stackoverflow) 1976-01-17
CA1024434A (en) 1978-01-17

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