EP0670454A1 - Bruleur pour lignite - Google Patents

Bruleur pour lignite Download PDF

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Publication number
EP0670454A1
EP0670454A1 EP94120182A EP94120182A EP0670454A1 EP 0670454 A1 EP0670454 A1 EP 0670454A1 EP 94120182 A EP94120182 A EP 94120182A EP 94120182 A EP94120182 A EP 94120182A EP 0670454 A1 EP0670454 A1 EP 0670454A1
Authority
EP
European Patent Office
Prior art keywords
burner
segments
mouth
stabilizing ring
lignite
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.)
Granted
Application number
EP94120182A
Other languages
German (de)
English (en)
Other versions
EP0670454B1 (fr
Inventor
Heinz Gräwe
Alfons Leisse
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.)
Babcock Kraftwerkstechnik GmbH
Original Assignee
Babcock Lentjes Kraftwerkstechnik GmbH
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 Babcock Lentjes Kraftwerkstechnik GmbH filed Critical Babcock Lentjes Kraftwerkstechnik GmbH
Priority to SI9430232T priority Critical patent/SI0670454T1/xx
Publication of EP0670454A1 publication Critical patent/EP0670454A1/fr
Application granted granted Critical
Publication of EP0670454B1 publication Critical patent/EP0670454B1/fr
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
    • F23D2201/20—Fuel flow guiding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2209/00—Safety arrangements
    • F23D2209/20—Flame lift-off / stability
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/01001—Pulverised solid fuel burner with means for swirling the fuel-air mixture

Definitions

  • Coal dust burners for lignite are usually designed as jet burners with a rectangular cross-section, in whose center plane air nozzles are used. Below and above these burners and between them, further air nozzles are provided for the supply of under air, upper air and middle air.
  • the coal dust can escape from this burner under unfavorable conditions with an uneven dust distribution, whereby, due to the lack of ignition aids, the fuel is ignited late in the combustion chamber and under conditions that occur during the pyrolysis by admixing the top and bottom - and medium air partially lead to an increased excess of air and thus favor NO x formation.
  • Lignite naturally contains a high proportion of water, which is largely evaporated during shredding in the mill with the help of hot smoke gases. As a result, the coal dust carrier gas flow carries with it a high proportion of water vapor, which has a negative effect on the ignition properties of the fuel at the burner outlet.
  • To enrich the coal dust in the coal dust carrier gas stream it is known (DE-OS 29 33 528) to provide a swirl body in the dust line which connects the mill to the burner. The swirl thus forced divides the coal dust carrier gas stream into a fuel-rich partial stream and a fuel-poor vapor stream.
  • the vapor stream is either discharged outside after flowing through a filter or it is fed to separate vapor burners. These vapor burners are arranged outside or as separate guide tubes within the main burner (DE-OS 29 33 528; Brennst.-Heat-Kraft 24 (1972) No. 3, pages 90-93).
  • the object of the invention is to improve a burner of the generic type suitable for the combustion of dusty lignite in such a way that clear ignition conditions are created.
  • a vapor separation is carried out within the burner itself, as a result of which the poorly igniting and poorly burning vapor, which is centrally surrounded by a fuel-rich jacket stream, is introduced into the combustion chamber.
  • the lignite particles in this jacket flow are almost completely on the inner wall of the burner tube.
  • these particles collide with a stabilization ring, which consists of differently shaped segments that protrude into the jacket flow.
  • the lignite particles lose their flow velocity, are reflected and accelerated again by the gas flow in the direction of the center of the burner tube towards the burner outlet.
  • the arranged in this area from part of the segments of the Stabilizing ring guided, acting as a vapor separating tube section prevents the reflected brown coal particles from being mixed again with the vapor.
  • the reignition rate for the outgassing coal particles is sometimes greater than their flow rate if there is sufficient ignition energy (e.g. if there is an oil, gas or coal fire in the combustion chamber).
  • ignition energy e.g. if there is an oil, gas or coal fire in the combustion chamber.
  • the lignite dust ignites in a controlled manner, in almost all operating situations with constant conditions, directly at the burner outlet.
  • the internal component of oxygen and the oxygen content of the carrier gas in the jacket stream are sufficient in any case to ignite the outgassing volatile coal components.
  • the burner air required to burn the remaining coal is supplied to each burner tube as secondary air. So that the ignition process at the burner outlet cannot be disturbed by air fluctuations, high outlet speeds or eddy formation, the secondary air is kept away by an air deflection throat and supplied to the fuel products with a sufficient delay.
  • a stabilization ring in connection with a swirl body is known in burners for the combustion of dusty hard coal.
  • hard coal which has a lower water content than lignite, is dried during the mill drying in the mill with preheated air, so that, unlike the mill drying of lignite with hot flue gases, the water vapor content in the coal dust carrier gas stream is lower and that No inert gases. Coping with these material flows was prepared by the combustion of Dusty lignite difficulties and was previously only possible by separating the vapor in front of the burner.
  • FIG. 1 shows the side view of a lignite burner
  • FIG. 2 shows the section II-II according to FIG. 1.
  • a burner 3 for the combustion of dusty lignite is arranged in an opening 1 of a side wall 2 of a combustion chamber.
  • the burner 3 consists of several, in the present case of three individual burners 3.1, 3.2, 3.3 arranged one above the other.
  • the individual burners 3.1, 3.2, 3.3 are located in a refractory brick lining 4.
  • Each individual burner 3.1, 3.2, 3.3 has a circular cross section and consists of a burner tube 5.
  • the burner tube 5 is connected via a manifold 6 to a dust line 7, which is led to a mill, not shown.
  • Raw lignite is milled in the mill and dried during the grinding process with the help of hot flue gas drawn in from the combustion chamber.
  • the flue gas serves both as drying and carrier gas.
  • a swirl generator 8 with a centrally arranged displacement body 9 is installed in the inlet-side end of the burner tube 5 facing the manifold 6.
  • the swirl generator 8 is provided on its circumference with a plurality of blades which are fastened on the displacement body 9.
  • the blades of the swirl generator 8 are arranged so as to overlap the longitudinal axis of the burner tube 5 at an angle of 15 to 45 °.
  • a stabilizing ring 10 is arranged which projects into the burner tube 5.
  • the stabilizing ring 10 contains two groups of segments 11 which are spaced apart and evenly distributed over the circumference.
  • the segments 11.1 of the first group are web-like with a small wall thickness and in Longitudinal direction of the burner tube 5 aligned.
  • the segments 11.2 of the second group are located axially and radially between the segments 11.1 of the first group. These segments 11.2 are shorter and, seen in the circumferential direction of the burner tube 5, wider than the segments 11.1.
  • six segments 11.1, 11.2 are provided.
  • the radial length of the segments 11.1, 11.2 protruding into the burner tube 5 is approximately 10 to 20% of the inner diameter of the burner tube 5. Their length in the circumferential direction can be 1 to 20% of the inner diameter of the burner tube 5.
  • a tube section 12 is arranged at a radial distance from the inner edge of the stabilizing ring 10, which is supported on the inner wall of the burner tube 5 via the segments 11.1 of the stabilizing ring 10.
  • the pipe section 12 protrudes a bit into the burner tube 5 and beyond the mouth of the burner tube 5.
  • the burner tube 6 is surrounded by an annular air duct 13 which is open towards the combustion chamber.
  • the air duct 13 is connected to a preferably spiral inlet housing 14.
  • the combustion air is supplied as secondary air via the air duct 13.
  • An air deflection throat 15 is arranged on the burner tube 5 in the mouth cross section of the air duct 13. The end of the air deflection throat 15 projects into the opening 1 of the side wall 2 of the combustion chamber and is formed on this part as a cone pointing outwards.
  • the lignite dust which has been ground and dried in the mill, reaches the burner tube 5 together with the carrier gas through the dust line 7 via the elbow 6.
  • the manifold 6 there is a first separation of the carbon particles from the Kolenstaub-carrier gas stream, which is reinforced by the downstream displacement body 9 and the swirl generator 8.
  • a sheath flow is generated, which preferably contains carbon particles is enriched.
  • the fuel-rich jacket stream encloses a low-fuel vapor stream that contains large amounts of water vapor and inert gases.
  • the segments 11.1, 11.2 of the stabilizing ring 10 protruding into the jacket flow cause a swirling of the jacket flow, as a result of which a reliable ignition in the plane of the mouth of the burner tube 5 and a stable flame zone in the combustion chamber are generated.
  • the pipe section 12 in the burner mouth prevents a mass transfer between the partially swirled, fuel-rich jacket stream and the low-oxygen and low-fuel central vapor stream.
  • the pipe section 12 thus contributes to further stabilizing the ignition.
  • the cone of the air deflection throat 15 keeps the secondary air emerging from the air duct 13 away from the burner mouth and thus prevents the ignition process from being affected by air fluctuations and high exit speeds or eddy formation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP94120182A 1994-03-04 1994-12-20 Bruleur pour lignite Expired - Lifetime EP0670454B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9430232T SI0670454T1 (en) 1994-03-04 1994-12-20 Burner for brown coal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4407198 1994-03-04
DE4407198A DE4407198A1 (de) 1994-03-04 1994-03-04 Braunkohlenbrenner

Publications (2)

Publication Number Publication Date
EP0670454A1 true EP0670454A1 (fr) 1995-09-06
EP0670454B1 EP0670454B1 (fr) 1999-03-10

Family

ID=6511845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94120182A Expired - Lifetime EP0670454B1 (fr) 1994-03-04 1994-12-20 Bruleur pour lignite

Country Status (6)

Country Link
EP (1) EP0670454B1 (fr)
CZ (1) CZ284925B6 (fr)
DE (2) DE4407198A1 (fr)
GR (1) GR3029937T3 (fr)
SI (1) SI0670454T1 (fr)
SK (1) SK281846B6 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101956973A (zh) * 2008-11-14 2011-01-26 巴布科克和威尔科克斯能量产生集团公司 带叶片的煤扩散器和煤管路平衡装置
WO2017212255A1 (fr) * 2016-06-08 2017-12-14 Doosan Babcock Limited Brûleur
DE102017101670A1 (de) 2017-01-27 2018-08-02 Babcock Borsig Steinmüller Gmbh Brenner, insbesondere Braunkohle-Strahlbrenner

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005032109B4 (de) * 2005-07-07 2009-08-06 Hitachi Power Europe Gmbh Kohlenstaubbrenner für niedrige NOx-Emissionen
EP3228935B1 (fr) 2016-04-08 2019-10-16 Steinmüller Engineering GmbH Procédé de combustion pauvre en oxyde d'azote de combustibles gazeux, solides ou liquides, en particulier de poussière de charbon, brûleur et installation de combustion destinée a exécuter le procédé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4545307A (en) * 1984-04-23 1985-10-08 Babcock-Hitachi Kabushiki Kaisha Apparatus for coal combustion
DD267548A1 (de) * 1987-11-30 1989-05-03 Thierbach Kraftwerk Kohlenstaubbrenner
US4930430A (en) * 1988-03-04 1990-06-05 Northern Engineering Industries Plc Burners
DD289321A5 (de) * 1989-11-23 1991-04-25 Technische Hochschule Zittau,De Vorrichtung zur verbrennung von brennstaeuben in ventilatormuehlenfeuerungen
EP0445938A1 (fr) * 1990-03-07 1991-09-11 Hitachi, Ltd. Brûleur à charbon pulvérisé, chaudière au charbon pulvérisé et procédé pour la combustion de charbon pulvérisé

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103850A1 (de) * 1991-02-08 1992-08-13 Wahl Verschleiss Tech Duesenring fuer die brennduese eines kohlenkraftwerkes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4545307A (en) * 1984-04-23 1985-10-08 Babcock-Hitachi Kabushiki Kaisha Apparatus for coal combustion
DD267548A1 (de) * 1987-11-30 1989-05-03 Thierbach Kraftwerk Kohlenstaubbrenner
US4930430A (en) * 1988-03-04 1990-06-05 Northern Engineering Industries Plc Burners
DD289321A5 (de) * 1989-11-23 1991-04-25 Technische Hochschule Zittau,De Vorrichtung zur verbrennung von brennstaeuben in ventilatormuehlenfeuerungen
EP0445938A1 (fr) * 1990-03-07 1991-09-11 Hitachi, Ltd. Brûleur à charbon pulvérisé, chaudière au charbon pulvérisé et procédé pour la combustion de charbon pulvérisé

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101956973A (zh) * 2008-11-14 2011-01-26 巴布科克和威尔科克斯能量产生集团公司 带叶片的煤扩散器和煤管路平衡装置
EP2187123A3 (fr) * 2008-11-14 2011-08-03 Babcock & Wilcox Power Generation Group, Inc. Stabilisateur de charbon à ailettes et dispositif d'équilibrage des chaînes de charbon
CN101956973B (zh) * 2008-11-14 2014-03-12 巴布科克和威尔科克斯能量产生集团公司 带叶片的煤扩散器和煤管路平衡装置
US8991323B2 (en) 2008-11-14 2015-03-31 Babcock & Wilcox Power Generation Group, Inc. Bladed coal diffuser and coal line balancing device
AU2009236029B2 (en) * 2008-11-14 2016-07-07 The Babcock & Wilcox Company Bladed coal diffuser and coal line balancing device
WO2017212255A1 (fr) * 2016-06-08 2017-12-14 Doosan Babcock Limited Brûleur
DE102017101670A1 (de) 2017-01-27 2018-08-02 Babcock Borsig Steinmüller Gmbh Brenner, insbesondere Braunkohle-Strahlbrenner
WO2018138323A1 (fr) 2017-01-27 2018-08-02 Bilfinger Engineering & Technologies Gmbh Brûleur, notamment brûleur radiant pour lignite

Also Published As

Publication number Publication date
SK150794A3 (en) 1995-10-11
CZ302794A3 (en) 1995-11-15
EP0670454B1 (fr) 1999-03-10
DE4407198A1 (de) 1995-09-07
DE59407926D1 (de) 1999-04-15
SI0670454T1 (en) 1999-06-30
GR3029937T3 (en) 1999-07-30
SK281846B6 (sk) 2001-08-06
CZ284925B6 (cs) 1999-04-14

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