EP0927320A1 - Bruleur d'angle pour dispositif de combustion tangentielle et procede permettant de faire fonctionner un tel bruleur - Google Patents

Bruleur d'angle pour dispositif de combustion tangentielle et procede permettant de faire fonctionner un tel bruleur

Info

Publication number
EP0927320A1
EP0927320A1 EP98932161A EP98932161A EP0927320A1 EP 0927320 A1 EP0927320 A1 EP 0927320A1 EP 98932161 A EP98932161 A EP 98932161A EP 98932161 A EP98932161 A EP 98932161A EP 0927320 A1 EP0927320 A1 EP 0927320A1
Authority
EP
European Patent Office
Prior art keywords
air
flow
nozzle
wall
combustion chamber
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Withdrawn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
EP98932161A
Other languages
German (de)
English (en)
Inventor
Werner Christ
Wolfgang Schreier
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.)
BBP Energy GmbH
Original Assignee
L&C Steinmueller 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 L&C Steinmueller GmbH filed Critical L&C Steinmueller GmbH
Publication of EP0927320A1 publication Critical patent/EP0927320A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F23C7/02—Disposition of air supply not passing through burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/08—Influencing flow of fluids of jets leaving an orifice
    • 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 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08—Disposition of burners
    • F23C5/32—Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally

Definitions

  • the invention relates to a method for operating a corner burner for tangential firing, in which at least one stream of coal dust and primary air and optionally another stream of combustion air and / or recirculated flue gas are oriented tangentially to an imaginary, essentially horizontal circle in the firing chamber of the tangential firing via the corner burner be introduced into the combustion chamber and at least one further air flow (wall air flow) adjustable through a nozzle of the corner burner is introduced into the combustion chamber at an offset angle to the flow of coal dust and primary air in the direction of a wall of the combustion chamber.
  • Such a method is known from EP 22 454 B1, in which an air flow referred to as secondary air is introduced into the furnace in such a way that the secondary air flow is directed tangentially to a second imaginary circle which is at a distance from the first imaginary circle to the outside.
  • the second air flow is intended to maintain an oxidizing atmosphere along the firing walls in order to reduce the formation of slag and corrosion on an associated firing wall.
  • the nozzle for the flow of coal dust and primary air and the nozzle for the secondary air are preferably arranged one above the other in the vertical installation position of the corner burner, as shown in FIG. 5 of EP 22 454 B1.
  • the nozzle has swiveling devices for the further air flow (secondary air flow or wall air flow). Such mechanical swivel devices are complex to manufacture and are exposed to the high furnace temperatures.
  • the offset angle is adjusted by a proportionate mixture of at least two partial air jets of different flow speeds, one of which flows in a straight line onto the outlet opening of the nozzle and the other partial flow flows into the one partial flow at an angle in front of the outlet opening and whose flow velocities can be changed.
  • the exit angle of the mixed flow from the outlet opening of the wall air nozzle can be adjusted continuously.
  • Mechanical adjustment elements in the outlet opening of the nozzle are not required.
  • the invention is also directed to a corner burner with at least one nozzle for the exit of a flow of coal dust and primary air and at least one nozzle for the exit of a further air flow (wall air flow) at an adjustable offset angle relative to the coal dust primary air flow.
  • a mixing space is provided in front of the outlet opening of the nozzle, which has a wall extending parallel to the axis and wall inclined against the axis, and that the widening mixing space is on its end facing away from the outlet opening of the nozzle is connected to at least two air channels in such a way that the air stream emerging from one channel is aligned directly with the outlet opening and the air stream emerging from the other air channel hits the inclined wall, is deflected and can be mixed into the first partial stream, and that the flow velocities of the two partial flows are adjustable.
  • the two air ducts are preferably formed by a single air supply duct with an internal duct partition which ends approximately at the connection point between the mixing space and the air supply duct.
  • a particularly simple embodiment is achieved if the air channels have essentially the same cross section.
  • the coal dust primary air nozzle and the further nozzle are arranged one above the other.
  • Fig. 1 shows a horizontal section through the firebox of a tangential
  • FIGS. 2-4 show a schematic horizontal section through the firing chamber and a wall air nozzle of a corner burner to explain different exposure conditions of the wall air nozzle.
  • FIG. 1 shows a horizontal cross-section, not to scale, through the combustion chamber 1 of a tangential furnace.
  • Corner burners 2 are assigned to the four corners of the firebox. Each corner burner has at least one nozzle for the discharge of a stream 3 of coal dust and primary air.
  • the coal dust primary air flows 3 are aligned with an imaginary circle 4 arranged concentrically to the vertical axis of the combustion chamber. As a result of this alignment, the combustion chamber swirl 5 is formed in the combustion chamber during operation of the furnace.
  • a wall air stream 6 is fed via a wall air nozzle 9 of the corner burner in such a way that it enters between the main stream 3 and an adjacent combustion chamber wall 7 in order to build up an oxidizing atmosphere in the endangered area 8 of the combustion chamber wall 7 and to avoid slagging and corrosion of the wall 7. It is advisable that the offset angle ⁇ is adjustable.
  • a horizontal section through the wall air nozzle 9 of the corner burner 2 is shown, which is arranged above or below the coal dust primary air nozzle.
  • a mixing chamber 11 is connected upstream of the outlet opening 10 with the central axis 10a.
  • the mixing space 11 is delimited by a wall 12 which extends from the outlet opening 10 and extends vertically parallel to the axis 10a and a wall 13 which likewise extends from the outlet opening and is inclined at an angle to the axis 10a in such a way that the mixing space extends from the outlet opening 10 starting expanded.
  • An air supply duct 14 is connected to the free end of the mixing chamber 11 and is divided into a sub-duct 16 and a sub-duct 17 by a duct partition 15, the sub-duct 16 essentially directly onto the outlet opening 10 and the sub-duct 17 onto the inside of the inclined wall 13 are aligned.
  • the two channels 16 and 17 preferably have the same flow cross sections.
  • the partition 15 is preferably aligned with the upper edge of the outlet opening in FIGS. 2-4 and preferably ends in the connection area between the mixing space 11 and the air supply duct 14.
  • the wall 12 can of course be an extension of the corresponding wall of the duct 14.
  • the offset angle ⁇ is achieved by supplying ducts 16 and 17 with partial air flows of different speeds.
  • the length of the arrow symbols used in the figures is a measure of the speed.
  • the direction of exit is further determined by the angle of inclination ⁇ of the wall 13.
  • the wall air flow 6 occurs at the maximum possible angle, which is somewhat smaller than the angle of inclination ⁇ of the side wall 13, because it also occurs in the subchannel (17 in FIGS. 2 and 16 in FIG. 3) that is less loaded some rest of the air has to flow to cool the channel.
  • the boundary surfaces of the mixing chamber parallel to the plane of the drawings 2-4 can be formed by parallel and horizontally spaced sheets.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)

Abstract

L'invention concerne un procédé permettant de faire fonctionner un brûleur d'angle (2) destiné à un dispositif de combustion tangentielle, selon lequel, par l'intermédiaire dudit brûleur d'angle, au moins un courant (3) de charbon pulvérisé et d'air primaire, et éventuellement un autre courant d'air de combustion et/ou de gaz de fumée recyclé sont introduits dans la chambre de combustion, en étant dirigés tangentiellement vers un cercle (4) imaginaire sensiblement horizontal se trouvant dans ladite chambre de combustion du dispositif de combustion tangentielle. Au moins un autre courant d'air (6) (courant d'air de paroi) peut être introduit dans la chambre de combustion, avec un angle de décalage (α), pouvant être réglé par l'intermédiaire d'une buse (9) du brûleur d'angle, par rapport au courant de charbon pulvérisé et d'air primaire, en direction d'une paroi (7) de la chambre de combustion. Pour que la possibilité de régler ledit angle de décalage soit améliorée, il est prévu que cet angle de décalage (α) soit réglé au moyen d'un mélange proportionnel d'au moins deux jets d'air partiels (16, 17) présentant des vitesses d'écoulement différentes, le premier (16) de ces courants partiels s'écoulant en ligne droite dans l'orifice de sortie (10) de la buse (9), et le second (17) pénétrant, avant l'orifice de sortie, et à un certain angle, dans le premier courant partiel. Les vitesses d'écoulement desdits courants partiels peuvent être modifiées.
EP98932161A 1997-07-22 1998-06-17 Bruleur d'angle pour dispositif de combustion tangentielle et procede permettant de faire fonctionner un tel bruleur Withdrawn EP0927320A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19731474A DE19731474C1 (de) 1997-07-22 1997-07-22 Verfahren zum Betrieb eines Eckenbrenners für eine Tangentialfeuerung und Eckenbrenner zur Durchführung des Verfahrens
DE19731474 1997-07-22
PCT/EP1998/003655 WO1999005451A1 (fr) 1997-07-22 1998-06-17 Bruleur d'angle pour dispositif de combustion tangentielle et procede permettant de faire fonctionner un tel bruleur

Publications (1)

Publication Number Publication Date
EP0927320A1 true EP0927320A1 (fr) 1999-07-07

Family

ID=7836532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98932161A Withdrawn EP0927320A1 (fr) 1997-07-22 1998-06-17 Bruleur d'angle pour dispositif de combustion tangentielle et procede permettant de faire fonctionner un tel bruleur

Country Status (6)

Country Link
US (1) US6082273A (fr)
EP (1) EP0927320A1 (fr)
DE (1) DE19731474C1 (fr)
PL (1) PL332429A1 (fr)
WO (1) WO1999005451A1 (fr)
ZA (1) ZA986202B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6005301A (en) * 2000-04-12 2001-10-23 Saar Energie Gmbh Method for burning particulate fuel in a power station boiler
DE10301316B3 (de) * 2003-01-15 2004-08-05 Alstom Power Boiler Gmbh Verfahren und Vorrichtung zum NOx-armen Verbrennen von Brennstoffstaub
DE102004022514A1 (de) * 2004-05-05 2005-12-01 Babcock-Hitachi Europe Gmbh Dampferzeuger und Verfahren zum Betreiben eines Dampferzeugers
PL385432A1 (pl) * 2008-06-13 2009-12-21 Politechnika Lubelska Sposób utylizacji odpadów ściekowych zintegrowany z odzyskiem energii
CN101718431B (zh) * 2009-12-28 2011-03-23 上海交通大学 电站燃煤锅炉直流燃烧器喷口结构
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
DE102016002899B4 (de) 2016-03-09 2020-03-12 Johannes Kraus Feuerraum mit verbessertem Ausbrand
CN111594828A (zh) * 2020-04-10 2020-08-28 中国大唐集团科学技术研究院有限公司火力发电技术研究院 基于锅炉设计角度的防结渣方法

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE972968C (de) * 1941-11-25 1959-11-05 Comb Engineering Mit fluessigem Schlackenabfluss arbeitender Strahlungsdampferzeuger
US4294178A (en) * 1979-07-12 1981-10-13 Combustion Engineering, Inc. Tangential firing system
US4569311A (en) * 1981-09-24 1986-02-11 Combustion Engineering, Inc. Method of firing a pulverized coal-fired furnace
US4425855A (en) * 1983-03-04 1984-01-17 Combustion Engineering, Inc. Secondary air control damper arrangement
JPS6370005A (ja) * 1986-09-10 1988-03-30 Mitsubishi Heavy Ind Ltd ボイラ
SU1753186A1 (ru) * 1990-03-27 1992-08-07 Московский энергетический институт Способ сжигани пылеугольного топлива
US5315939A (en) * 1993-05-13 1994-05-31 Combustion Engineering, Inc. Integrated low NOx tangential firing system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9905451A1 *

Also Published As

Publication number Publication date
WO1999005451A1 (fr) 1999-02-04
PL332429A1 (en) 1999-09-13
US6082273A (en) 2000-07-04
DE19731474C1 (de) 1998-12-24
ZA986202B (en) 1999-02-02

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