EP0144504A1 - Verfahren und Apparat zur Erosionsverhütung in einem Düsenkopf - Google Patents

Verfahren und Apparat zur Erosionsverhütung in einem Düsenkopf Download PDF

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Publication number
EP0144504A1
EP0144504A1 EP84107604A EP84107604A EP0144504A1 EP 0144504 A1 EP0144504 A1 EP 0144504A1 EP 84107604 A EP84107604 A EP 84107604A EP 84107604 A EP84107604 A EP 84107604A EP 0144504 A1 EP0144504 A1 EP 0144504A1
Authority
EP
European Patent Office
Prior art keywords
inner shell
air
passing
nozzle tip
preventing erosion
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.)
Withdrawn
Application number
EP84107604A
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English (en)
French (fr)
Inventor
John David Fishburn
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.)
Lummus Crest SARL
Original Assignee
Lummus Crest SARL
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 Lummus Crest SARL filed Critical Lummus Crest SARL
Publication of EP0144504A1 publication Critical patent/EP0144504A1/de
Withdrawn legal-status Critical Current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

  • the present invention relates to burner nozzle tips adapted for use on pulverized coal-fired furnaces and more particularly to tilting nozzle tips for burners on pulverized coal-fired furnaces utilizing tangential firing.
  • tangential firing One common method of firing coal in a coal-fired steam generating furnace is known as tangential firing.
  • pulverized coal is introduced into the furnace in a primary air stream through burners, termed fuel-air emission assemblies, located in the corner windboxes of the furnace.
  • the pulverized coal-air streams discharging from the burners are aimed tangentially to an imaginary circle in the middle of the furnace combustion chamber to create a massive flame therein termed a fireball.
  • the combustion products formed in the fireball pass through a convective heat transfer section typically housing a superheater, a reheater, and other heat absorption surfaces to cool the combustion products and generate superheated steam.
  • a typical coal-air emission assembly or burner employed heretofore on a tangentially fired furnace comprises a coal delivery pipe, often termed a coal nozzle, through which pulverized coal entrained in a primary air stream is delivered to the furnace, an air conduit surrounding the coal delivery pipe through which additional air is delivered to the furnace, and a nozzle tip pivotally mounted on the coal delivery pipe so as to be tiltable in a vertical plane whereby the pulverized coal-air stream being delivered to the furnace through the coal delivery pipe and the additional air passing through the air conduit can be directly discharged into the furnace combustion chamber as dictated by steam temperature requirements.
  • a typical prior art burner nozzle tip is formed of an open-ended inner shell defining a flow passageway through which the pulverized coal-air stream from the coal delivery pipe is delivered into the furnace combustion chamber and an open-ended outer shell spaced from and surrounding the inner shell so as to define an annular duct through which the air leaving the air conduit is directed into the furnace.
  • one or more baffles termed splitter plates, are typically disposed within the inner shell of the nozzle tip and aligned parallel to the longitudinal axis thereof to impart additional directional force to the coal-air stream discharging through the inner shell and to ensure a uniform distribution of the coal-air stream particularly when the nozzle tip is tilted away from the horizontal.
  • a problem encountered in using such nozzle tips has been the erosion of the inner wall of the inside shell due to impingement of coal particles entrained in the primary air stream as they pass from the coal delivery pipe through the flow passageway within the inner shell into the furnace combustion chamber. This results in increased wear of the inner surface of the inner shell particularly when the nozzle tips are tilted away from the horizontal. Consequently, the prior art nozzle tips must be replaced more often than preferred and more frequently than would be necessary if the inner surface of the inner shell of the nozzle tip had not been exposed to the erosive effect of the impinging coal particles.
  • the present invention provides an improved nozzle tip which has a significantly longer life in the extremely erosive environment associated with pulverized coal firing.
  • an improved nozzle tip has means for air passage connecting the annular duct between the inner shell and the outer shell and the flow passageway within the inner shell in the region where the inner shell interfaces with the coal delivery pipe.
  • the air passage means divert air that would otherwise pass to the furnace combustion chamber through the annular duct between the inner shell and outer shell to pass along the inner surface of the inside shell thereby providing a layer of coal-free air along the inside wall of the inner shell which reduces erosion of the inner surface of the inner shell.
  • FIG. 1 there is depicted therein an improved nozzle tip 10 constructed in accordance with the present invention as best seen in Figure 1.
  • the burner nozzle tip 10 is shown incorporated into a fuel-air emission assembly of the type typically employed on a pulverized coal-fired furnace utilizing tangential firing, although variations of the improved nozzle tip of the present invention may readily be incorporated in other fuel-air configurations without departing from the spirit and scope of the present invention.
  • Nozzle tip 10 comprises an open-ended inner shell 12 surrounded by an open-ended outer shell 14 which is spaced away from inner shell 12 by a plurality of ribs 16 disposed therebetween. Ribs 16 are disposed between the inner surface of outer shell 14 and the outer surface of inner shell 12 thereby forming the structural framework of nozzle tip 10. As shown in Figure 2, nozzle tip 10 is recessed into the air delivery conduit 18 of the fuel-air emission assembly and pivotally mounted to the discharge end of coal delivery pipe 20 so as to be tiltable about axis 22 transverse to the longitudinal axis of the coal delivery pipe 20.
  • Nozzle tip 10 provides a means for imparting a directional force to the pulverized coal discharging from coal delivery pipe 20 and the air delivered to the furnace through air delivery conduit 18.
  • Inner shell 12 is adapted to fit around the discharge end of coal delivery pipe 20 and define a duct, chamber 24, which serves as a flow passageway through which the pulverized coal-air stream discharging from coal delivery pipe 20 traverses before entering the furnace.
  • An annular duct 26 is defined in the space between inner shell 12 and outer shell 14 which serves as a flow passageway through which the additional air discharging from air delivery conduit 18 must traverse before entering the furnace.
  • nozzle tip 10 is tiltable about an axis transverse to the longitudinal axis to coal delivery pipe 18 in order that the position of the fireball within the combustion chamber of the furnace may be changed to effect steam temperature control.
  • nozzle tip 10 In its normal position, nozzle tip 10 is positioned with its longitudinal axis aligned with the longitudinal axis of coal delivery pipe 18, which is generally horizontally disposed.
  • nozzle tip 10 In order to raise the fireball within the furnace, nozzle tip 10 is rotated about axis 22 so as to tilt upward, thereby causing both the pulverized coal-air stream traversing chamber 24 and the air traversing annular duct 26 to be directed upward.
  • nozzle tip 10 is rotated about axis 22 so as to tilt downward thereby causing both the pulverized coal-air stream traversing chamber 24 and the air traversing annular duct 26 to be directed downward.
  • splitter plates At least one, and usually two or three baffles, termed splitter plates, are positioned within inner shell 12 so as to divide chamber 24 into a plurality of flow passages. Each splitter plate 30 deflects a portion of the pulverized coal-air stream passing through chamber 24. Although there remains some stratification of coal within each flow passage, over all of the flow passages the distribution of pulverized coal is maintained.
  • splitter plates 30 reduce but do not eliminate the erosion of the inner surface of inner shell 12.
  • the erosion of the inner surface of inner shell 12 is particularly acute at the top when nozzle tip 10 is tilted downward causing the pulverized coal-air stream traversing chamber 24 to be directed downward.
  • the erosion of the inner surface of inner shell 12 is particularly acute at the bottom when nozzle tip 10 is tilted upward causing the pulverized coal-air stream traversing chamber 24 to be directed upward.
  • the side walls of inner shell 12 also erode due to impingement of coal particles. Although erosion of the side walls is less acute, there erosion is enhanced when the horizontal cross-section of chamber 24 is trapazoidal with the pulverized coal-air stream passing from the longer parallel line segment of the trapazoidal cross-section across and substantially perpendicular to the parallel line segments, and exiting the trapazoidal cross-section at the shorter parallel line segment.
  • the trapazoidal cross-section further aggrevates coal particles impinging on the inner surface of inner shell 12. When the inner shell 12 becomes too worn, the furnace must be taken off line in order to replace or repair the nozzle tips.
  • an improved nozzle tip 10 having means for passing air from annular duct 26 to inside inner shell 12 to provide a coal-free layer of air along the inner surface of inner shell 12.
  • the air passage means are located just upstream of where coal delivery pipe 20 introduces the pulverized coal-air stream into inner shell 12.
  • the air passage means in a preferred embodiment comprise a plurality of openings through inner shell 12 angled in the direction of flow through both annular duct 26 and chamber 24.
  • Air passage means 32 as shown in Figure 1 may comprise but are not limited to holes as other air passage means such as slots may be used.
  • the air passage means 32 located on a surface of inner shell 12 that supports a splitter plate are located adjacent the mounting of splitter plates 30 on the inside surface of inner shell 12. This enables the air passing through such strategically located air passage means 32 to prevent erosion at the side edges of splitter plates 30.
  • FIG. 4 An alternate embodiment of the invention employing a deflector 34 is shown in Figure 4.
  • the deflector may be mounted on inner shell 12 or be, as shown, the displaced portion of inner shell 12 that creates air passage means 32.
  • the present invention provides an improved nozzle tip 10 which possesses a longer useful lifetime than prior art nozzle tips in the extremely erosive environment associated with pulverized coal firing.
  • the improvement is characterized by air passage means 32 which provide a layer of coal-free air along the inner surface of inner shell 12 to prevent the stream of pulverized coal-air passing through chamber 24 from contacting and eroding the inner surface of inner shell 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP84107604A 1983-07-07 1984-06-30 Verfahren und Apparat zur Erosionsverhütung in einem Düsenkopf Withdrawn EP0144504A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51159683A 1983-07-07 1983-07-07
US511596 1983-07-07

Publications (1)

Publication Number Publication Date
EP0144504A1 true EP0144504A1 (de) 1985-06-19

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ID=24035594

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107604A Withdrawn EP0144504A1 (de) 1983-07-07 1984-06-30 Verfahren und Apparat zur Erosionsverhütung in einem Düsenkopf

Country Status (4)

Country Link
EP (1) EP0144504A1 (de)
JP (1) JPS6057104A (de)
AU (1) AU3037184A (de)
ZA (1) ZA843645B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315802A1 (de) * 1987-11-09 1989-05-17 Stubinen Utveckling AB Vorrichtung zum Verbrennen fester Brennstoffe, insbesondere Kohle, Torf oder dergleichen, in pulverisierter Form
WO1997023751A1 (en) * 1995-12-22 1997-07-03 Combustion Engineering, Inc. Boundary layer coal nozzle assembly for steam generation apparatus
WO2007120998A1 (en) * 2006-04-10 2007-10-25 Alstom Technology Ltd Pulverized solid fuel nozzle assembly
EP2381172A4 (de) * 2009-01-19 2017-10-18 Nippon Steel Engineering Co., Ltd Brenner
CN111219707A (zh) * 2020-03-05 2020-06-02 河北烈焰机械工程有限公司 一种pmc燃烧系统用pmc燃烧器

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3686250B2 (ja) * 1998-03-26 2005-08-24 三菱重工業株式会社 微粉炭バーナ
JP3790489B2 (ja) * 2002-03-25 2006-06-28 三菱重工業株式会社 微粉固体燃料燃焼装置
JP4948200B2 (ja) 2007-02-19 2012-06-06 プライムアースＥｖエナジー株式会社 ヒータ付き電池構造体
JP2011127836A (ja) 2009-12-17 2011-06-30 Mitsubishi Heavy Ind Ltd 固体燃料焚きバーナ及び固体燃料焚きボイラ
US8561553B2 (en) * 2009-12-17 2013-10-22 Babcock Power Services, Inc. Solid fuel nozzle tip assembly
JP5374404B2 (ja) 2009-12-22 2013-12-25 三菱重工業株式会社 燃焼バーナおよびこの燃焼バーナを備えるボイラ
JP5629901B2 (ja) * 2013-07-22 2014-11-26 三菱日立パワーシステムズ株式会社 固体燃料焚きバーナ及び固体燃料焚きボイラ
CN104180369B (zh) * 2014-09-10 2016-08-24 朱华平 煤粉喷嘴装置
JP6804318B2 (ja) * 2017-01-31 2020-12-23 三菱パワー株式会社 燃焼バーナ及びこれを備えたボイラ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB323824A (en) * 1928-10-18 1930-01-16 Alfred John Elderton Improvements in apparatus for firing furnaces with pulverised fuel
US1841831A (en) * 1927-07-22 1932-01-19 Marston Horace Arthur Burner for pulverized fuel
US1971328A (en) * 1929-08-06 1934-08-28 William H Byrne Fuel burner
US2608168A (en) * 1949-10-21 1952-08-26 Comb Eng Superheater Inc Dual nozzle burner for pulverized fuel
US3823875A (en) * 1973-08-24 1974-07-16 T Bauer Burner nozzle tip for pulverized coal and method for its production

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1841831A (en) * 1927-07-22 1932-01-19 Marston Horace Arthur Burner for pulverized fuel
GB323824A (en) * 1928-10-18 1930-01-16 Alfred John Elderton Improvements in apparatus for firing furnaces with pulverised fuel
US1971328A (en) * 1929-08-06 1934-08-28 William H Byrne Fuel burner
US2608168A (en) * 1949-10-21 1952-08-26 Comb Eng Superheater Inc Dual nozzle burner for pulverized fuel
US3823875A (en) * 1973-08-24 1974-07-16 T Bauer Burner nozzle tip for pulverized coal and method for its production

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315802A1 (de) * 1987-11-09 1989-05-17 Stubinen Utveckling AB Vorrichtung zum Verbrennen fester Brennstoffe, insbesondere Kohle, Torf oder dergleichen, in pulverisierter Form
WO1997023751A1 (en) * 1995-12-22 1997-07-03 Combustion Engineering, Inc. Boundary layer coal nozzle assembly for steam generation apparatus
WO2007120998A1 (en) * 2006-04-10 2007-10-25 Alstom Technology Ltd Pulverized solid fuel nozzle assembly
US7739967B2 (en) 2006-04-10 2010-06-22 Alstom Technology Ltd Pulverized solid fuel nozzle assembly
KR101031991B1 (ko) * 2006-04-10 2011-05-02 알스톰 테크놀러지 리미티드 분쇄 고체 연료의 노즐 조립체
EP2381172A4 (de) * 2009-01-19 2017-10-18 Nippon Steel Engineering Co., Ltd Brenner
CN111219707A (zh) * 2020-03-05 2020-06-02 河北烈焰机械工程有限公司 一种pmc燃烧系统用pmc燃烧器

Also Published As

Publication number Publication date
JPS6057104A (ja) 1985-04-02
AU3037184A (en) 1985-01-10
ZA843645B (en) 1984-12-24

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Inventor name: FISHBURN, JOHN DAVID