EP0723113B1 - Tiltable split stream burner assembly with gasket seal - Google Patents

Tiltable split stream burner assembly with gasket seal Download PDF

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Publication number
EP0723113B1
EP0723113B1 EP19960300317 EP96300317A EP0723113B1 EP 0723113 B1 EP0723113 B1 EP 0723113B1 EP 19960300317 EP19960300317 EP 19960300317 EP 96300317 A EP96300317 A EP 96300317A EP 0723113 B1 EP0723113 B1 EP 0723113B1
Authority
EP
European Patent Office
Prior art keywords
annular passage
fuel
burner assembly
discharge
passage
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
EP19960300317
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0723113A3 (en
EP0723113A2 (en
Inventor
Joel Vatsky
Timothy W. Sweeney
Lawrence Frank Newman
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 Energy Corp
Original Assignee
Foster Wheeler Energy 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 Foster Wheeler Energy Corp filed Critical Foster Wheeler Energy Corp
Publication of EP0723113A2 publication Critical patent/EP0723113A2/en
Publication of EP0723113A3 publication Critical patent/EP0723113A3/en
Application granted granted Critical
Publication of EP0723113B1 publication Critical patent/EP0723113B1/en
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
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/10—Nozzle tips
    • F23D2201/101—Nozzle tips tiltable

Definitions

  • This invention relates generally to a burner assembly and, more particularly, to a burner assembly which discharges a plurality of streams of coal and air for combustion in a furnace and which has a tiltable discharge portion to vary the discharge pattern.
  • the burner assembly disclosed in the above patent was designed for a particular furnace configuration, and, as such, is not suitable for other special application furnaces, such as, for example, tangentially fired furnaces.
  • EP-A-0129001 discloses a fuel nozzle having an inner shell through which pulverised fuel is directed into a furnace and an annular passageway through which air is directed into the furnace. Diverging splitter plates in the inner shell separate and diverge the pulverised fuel into two diverging streams.
  • a burner assembly comprises an inlet member for receiving fuel, a discharge member connected to, and forming an extension of, the inlet member for receiving fuel, a divider member disposed within the discharge member for dividing the discharge member into a central passage and an annular passage surrounding the central passage, whereby a portion of the fuel from the inlet member passes into the central passage and a portion passes into the annular passage, means associated with the annular passage for splitting the stream of fuel passing through the annular passage into a plurality of streams as it discharges from the discharge member so that, upon ignition of the fuel, a plurality of flame patterns are formed, and means for tilting the discharge member relative to the inlet member to vary the discharge angle of the flame patterns relative to the inlet member.
  • the present invention provides a burner assembly which gives the advantages of the burner assembly disclosed in the above-identified patent including the reduction of nitrogen oxides in the combustion of fuel.
  • the burner assembly of the above type may be used in multiple furnace configurations.
  • the reference numeral 10 refers in general to the burner assembly of the present invention.
  • the burner assembly 10 includes a tubular inlet barrel 12 and a discharge nozzle 14 connected to, and forming an extension of, the inlet barrel 12 in a manner to be described.
  • a cap 16 (Fig. 2) extends over one end 12a of the inlet barrel and the other end 12b is enlarged for reasons to be described.
  • the discharge nozzle 14 is connected to, and forms an extension of, the inlet barrel 12.
  • the discharge nozzle 14 has an enlarged end portion 14a extending over the enlarged end portion 12b of the inlet barrel 12, while the other end 14b of the nozzle 14 is open and is configured in a manner to be described.
  • a duct 24 is connected to the barrel 12 and registers with an opening 12c in the wall of the barrel.
  • the duct extends tangentially with respect to the annular passage 20 for introducing a stream of fuel, preferably in the form of pulverized coal mixed with air into the passage, as will be explained in detail later.
  • That portion of the nozzle 14 extending from its enlarged portion 14a to its end 14b has a rectangular cross section which tapers in a direction towards the end 14b.
  • a divider cone 26 is disposed within the nozzle 14 and extends from the enlarged portion 14a of the nozzle 14 to its end 14b.
  • the cone 26 is hollow and thus defines a central passage 27 and has a taper substantially corresponding to the taper of the nozzle 14.
  • the cone 26 has a diameter less than that of the nozzle 14 to define an annular passage 28 surrounding the central passage 27.
  • the inlet ends of both the central passage 27 and the annular passage 28 are located immediately adjacent the enlarged portion 14a of the nozzle 14 and their discharge ends extend flush with the end 14b of the latter member.
  • splitters 30 extend within, and are circumferentially spaced around, the annular passage 28.
  • the splitters 30 are spaced at 90° intervals and each is substantially V-shaped with its respective apex disposed adjacent the inlet end of the annular passage 28.
  • the other ends of the splitters 30 extend flush with the end 14b of the nozzle 14 and therefore the discharge end of the annular passage 28.
  • the nozzle 14 can be molded into a integral unit which would include the cone 26 and the splitters 30, as disclosed in U. S. patent number 5 347 937 assigned to the assignee of the present invention.
  • the enlarged portion 12a of the barrel 12 is connected to the enlarged end portion 14a of the nozzle 14 by a gasket seal assembly, referred to in general by the reference numeral 32.
  • the seal assembly 32 abuts the end of the inlet member 12 as well as a corresponding inner surface portion of the discharge member 14 and is formed by an annular mesh member 34 and an annular frame member 36.
  • the frame member 36 is U-shaped in cross-section is crimped around the inner portion of the mesh member 34 and can be secured to the barrel 12 in any known manner, such as by welding.
  • the nozzle 14 is tilted relative to the barrel 12 by means of a pair of arms 40a (Fig. 1) and 40b (Fig. 2) respectively attached to diametrically opposed outer surfaces of the nozzle 14.
  • the arms 40a and 40b extend horizontally, as viewed in Fig. 1, and are attached to a linkage mechanism (not shown) which produces an up-and-down movement, causing the nozzle 14 to pivot about an axis A.
  • This linkage mechanism is fully disclosed in U.S. patent number 5 461 990.
  • This pivotal, or tilting movement of the nozzle 14 about the axis A is accommodated by the gasket seal assembly 32 which also seals against any leakage of the fuel/air mixture.
  • the burner assembly 10 would be disposed in axial alignment with a through opening formed in a front wall of a conventional furnace having a combustion chamber immediately adjacent the opening. In most installations, similar openings would be provided in the furnace front wall for accommodating additional burner assemblies identical to the burner assembly 10. Also, a windbox and one or more air nozzles would be provided for introducing additional, or secondary, air into the furnace as disclosed in the above-identified U.S patent. It is also understood that appropriate igniters (not shown) can be provided adjacent the outlet of the assembly 10 for igniting the coal as it discharges from the nozzle. Since the igniters are of a conventional design they have not been shown in the drawings in the interest of clarity.
  • fuel preferably in the form of pulverized coal suspended or entrained within a source of primary air
  • fuel is introduced from an external source into the duct 24, and passes through the duct into the interior of the barrel 12 where it swirls through the annular passage 20. Since the pulverized coal is heavier than the air, the pulverized coal will tend to move radially outwardly towards the inner wall of the barrel 12 under the centrifugal forces thus produced.
  • the stream of coal and air pass from the interior of the barrel 12 to the interior of the nozzle 14 and, as a result of the above-mentioned centrifugal forces, the stream consists of a relatively large portion of coal and a relatively small portion of air.
  • the stream then enters the outer annular passage 28 defined between the nozzle 14 and the divider cone 26 and encounter the splitters 30. The stream is thus split into four equally spaced streams which discharge from the outlet defined by the respective ends of the discharge member 14 and the cone 26.
  • the provision of multiple flame patterns results in a greater flame radiation, a lower average flame temperature and a shorter residence time of the gas components within the flame at a maximum temperature, all of which, contribute to reduce the formation of nitric oxides.
  • the provision of the tangential inlet to the annular passage 20 provides excellent distribution of fuel, resulting in more complete combustion and reduction of carbon loss and making it possible to use individual burners with capacities significantly higher than otherwise could be used.
  • the nozzle 14 may be tilted, or pivoted, relative to the inlet member 12 before operation to accommodate different furnace configurations and requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
EP19960300317 1995-01-17 1996-01-17 Tiltable split stream burner assembly with gasket seal Expired - Lifetime EP0723113B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37381095A 1995-01-17 1995-01-17
US373810 1995-01-17

Publications (3)

Publication Number Publication Date
EP0723113A2 EP0723113A2 (en) 1996-07-24
EP0723113A3 EP0723113A3 (en) 1996-09-18
EP0723113B1 true EP0723113B1 (en) 2000-03-22

Family

ID=23473971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960300317 Expired - Lifetime EP0723113B1 (en) 1995-01-17 1996-01-17 Tiltable split stream burner assembly with gasket seal

Country Status (7)

Country Link
EP (1) EP0723113B1 (da)
CN (1) CN1146542A (da)
CA (1) CA2167341C (da)
DE (1) DE69607224T2 (da)
ES (1) ES2146356T3 (da)
IN (1) IN186605B (da)
PT (1) PT723113E (da)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN161339B (da) * 1983-04-22 1987-11-14 Combustion Eng
AU577366B2 (en) * 1984-04-27 1988-09-22 Foster Wheeler Energy Corporation Controlled flow, split stream burner assembly with sorbent injection

Also Published As

Publication number Publication date
IN186605B (da) 2001-10-13
CA2167341A1 (en) 1996-07-18
PT723113E (pt) 2000-06-30
DE69607224D1 (de) 2000-04-27
CA2167341C (en) 2000-03-21
DE69607224T2 (de) 2000-09-14
CN1146542A (zh) 1997-04-02
EP0723113A3 (en) 1996-09-18
EP0723113A2 (en) 1996-07-24
ES2146356T3 (es) 2000-08-01

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