EP0706007B1 - Procédé et brûleur pour la combustion d'un combustible pulvérisé - Google Patents

Procédé et brûleur pour la combustion d'un combustible pulvérisé Download PDF

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Publication number
EP0706007B1
EP0706007B1 EP95115733A EP95115733A EP0706007B1 EP 0706007 B1 EP0706007 B1 EP 0706007B1 EP 95115733 A EP95115733 A EP 95115733A EP 95115733 A EP95115733 A EP 95115733A EP 0706007 B1 EP0706007 B1 EP 0706007B1
Authority
EP
European Patent Office
Prior art keywords
duct
bend
fuel
tube
core air
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
EP95115733A
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German (de)
English (en)
Other versions
EP0706007A2 (fr
EP0706007A3 (fr
Inventor
Hans-Ulrich Dr.-Ing. Thierbach
Matthias Dr.-Ing. Jochem
Wolfgang Dipl.-Ing. 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
BBP Energy 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 BBP Energy GmbH filed Critical BBP Energy GmbH
Publication of EP0706007A2 publication Critical patent/EP0706007A2/fr
Publication of EP0706007A3 publication Critical patent/EP0706007A3/fr
Application granted granted Critical
Publication of EP0706007B1 publication Critical patent/EP0706007B1/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
    • F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2214/00—Cooling

Definitions

  • the invention relates to a burner in the preamble of claim 1 Art.
  • nitrogen oxides are formed primarily by oxidation of the fuel nitrogen contained in the coal.
  • Hydrogen cyanide (HCN) or ammonia (NH 3 ) are initially formed. These are then oxidized to nitrogen oxides.
  • An at least two-stage combustion is therefore sought, in which combustion is first carried out under substoichiometric conditions (primary combustion zone) with primary and jacket air, so that remaining combustible components are burned in a subsequent secondary combustion zone.
  • the ignition stability must remain guaranteed with a small air ratio in the primary combustion zone, ie it must be ensured that the fuel components to be ignited first are mixed in particularly well.
  • the primary combustion zone is under-stoichiometric, must a relatively high proportion of tertiary or stage air as late as possible, but especially be mixed in well. At the same time, the possibility of flue gas from the suck the surrounding fire chamber into the flame, to be guaranteed.
  • the connecting channel for training as a delay channel compared to the cross section of the Deflector has an enlarged cross-section at the end of Delay channel in the area of the and in the bend through the delay channel fuel dust Streakbreaker is arranged, the intake manifold the Deflecting gas flow passing through the delay channel so that the Gas flow at a predetermined angle to the at least in Partial strands of broken fuel dust streak hits and air and Coal dust enter the primary air pipe in an even distribution.
  • connection channel As a delay channel Increased segregation achieved and by breaking open the Streak of dust and its exposure to the gas flow under one predetermined angle becomes an even distribution of air and Coal dust reached in the primary air pipe, both in the radial direction as well as in the circumferential direction.
  • Subclaims 2-4 relate to advantageous embodiments of the burner according to claim 1.
  • Fig. 1 shows a longitudinal section through an embodiment of the burner according to the invention.
  • an oil ignition lance in the longitudinal axis of the burner 1 is provided, which is arranged within a core air tube 2.
  • the flame cone 3 of the oil pilot flame is indicated schematically.
  • the Core air tube is closed at its rear end by a plate 2a which is penetrated by the oil lance, and points near its rear end a side opening 2b.
  • the core air tube is axially displaceable - As indicated by the arrow P - stored in a guide tube 4.
  • a core air supply tube 5 At right angles to the guide tube 4 is a core air supply tube 5 connected.
  • the outlet opening of the core air supply pipe 5 is the assigned lateral opening 2b of the core air tube 2 and with a corresponding axial opening width provided such that when shifting of the core air pipe, the air brought in via the core air supply pipe can enter the core air tube unhindered.
  • the front section of the core air tube is cylindrical to form Ring channel surrounded by a primary air tube 6, the outlet opening is set back in relation to the outlet opening of the core air tube.
  • the core air tube is made with a coal dust-gas mixture in the following way acted upon. That from a coal grinding plant not shown or The coal dust-gas mixture brought up to the coal dust source Burner upstream deflector 7 supplied, in which Concentration of the coal dust K on the combustion chamber facing Side of the deflector is forced.
  • the deflector 7 is preferably a continuously curved bend. Like Figures 2 and 3 show, this forced concentration takes place regardless of whether the Inflow occurs from below (Fig. 2) or from above (Fig. 3).
  • a delay channel 8 in the form of a Channel extension, which in the embodiment shown has a channel is rectangular cross-section, i. H.
  • the already slowed down coal dust strand K meets a strand breaker 9 at the end of the delay channel 8.
  • the strand breaker 9 consists of a multiplicity of rod-shaped breaking elements 10 which are connected upstream of a predetermined circular sector of the inlet opening 11a of a venturi-like inlet assembly 11 and extend essentially parallel to the burner axis .
  • the crusher elements consist of cuboids arranged at a distance. The crushing elements can be easily replaced when worn.
  • the inlet assembly 11 surrounds the end of the Guide tube 4 with the formation of an annular channel.
  • the one on the back wall the gas flow of the delay channel is determined by a preferably extending at an angle of 45 ° and from that Guide tube 4 passes through the closing plate 12 in the annular Deflected inlet opening of the inlet assembly 11 and meets at an angle of almost 90 ° to the delayed and broken up by the strand breaker Dust flow.
  • This ensures an even distribution of the coal dust reached over the ring cross-section.
  • Due to the venturi-like design of the Entry assembly 11 will accelerate the gas flow parallel to Burner axis reached.
  • the resulting eddy formation may become local Strands of coal dust dissolved, causing coal dust and gas to mix become.
  • the constriction of the free cross-section in the entry assembly can be between 10 - 70%. At the same time the gas flow is blocked, whereby a further equalization is achieved.
  • the closing plate 12 together with the associated side walls 13 and 14, and the Breaking elements 10 bearing end wall 15 together with the Entry assembly 11 is a structural unit with the from the furnace side wall 16a facing away from an air box 16 by a Screw connection 17 is connected.
  • the components 12, 13, 14 and 15 form an intake manifold.
  • the Entry assembly 11 into the primary air tube 6, which with the side wall 16a is welded.
  • the core air tube 2 is at one end thereof Surrounded air duct 18.
  • a flame holder 19 is assigned to the outlet end of the primary air tube 6.
  • the flame holder 19 overlaps with a straight cylindrical end Edge of the primary air pipe and is on the end of the core air pipe 2 supported so that when the core air tube 2 moves Flame holder 19 moves in a corresponding manner (see. Fig. 1).
  • a device for influencing the swirl in shape arranged by rotatably mounted axial swirl flaps 25 which over a Linkage 26 and an actuator are adjustable from the outside. Through this axial swirl flaps, the jacket air becomes a swirl of adjustable size imposed.
  • a muffle 27 constructed from a ceramic mass, which mates with a S-shaped design of its inner surface extended towards the firebox.
  • This Muffle shape combined with the corresponding design of the Coal dust and a strong swirl of the jacket air with the help of Swirl flaps 25 guarantee fast, intensive ignition.
  • a high Circumferential speed of the jacket air and a corresponding design of the dust outlet cross-section is a quick mixing of fine dust realized in the jacket air.
  • the S-shape that can be seen in particular in FIG. 1 the muffle prevents tearing open even with high swirl intensity of the jacket air the primary flame.
  • the S-shape runs to the firebox so that one Outflow of the jacket air with a parallel to the burner axis Flow component can take place.

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)

Claims (4)

  1. Brûleur pour la combustion de combustible pulvérulent comprenant au moins un tuyau d'air primaire (6) véhiculant un mélange d'air et de combustible (air primaire), un tuyau coudé d'entrée (12, 13, 14, 15) disposé en amont du tuyau d'air primaire (6), un tuyau de dérivation (7), et un conduit de raccordement (8) disposé entre le tuyau de dérivation (7) et le tuyau coudé d'entrée (12, 13, 14, 15), une séparation au moins partielle du mélange combustible-air amené au tuyau de dérivation (7) en un faisceau de poussière combustible (k) et en un écoulement de gaz (G) se produisant dans le tuyau de dérivation (7) et dans le conduit de raccordement (8),
       caractérisé en ce que
       le conduit de raccordement (8), pour former un conduit de décélération, présente une section transversale élargie par rapport à la section transversale du tuyau de dérivation (7), en ce qu'un organe de rupture de faisceau (9 ; 10) est disposé à la fin du conduit de décélération (8) dans la zone du faisceau de poussière combustible (K) qui se forme dans le tuyau de dérivation (7) et qui est véhiculé à travers le conduit de décélération (8) , en ce que le tuyau coudé d'entrée (12, 13, 14, 15) dévie l'écoulement de gaz (G) qui traverse le conduit de décélération de telle sorte que l'écoulement de gaz (G) rencontre le faisceau de poussière combustible (K), brisé au moins en faisceaux partiels, sous un angle prédéterminé, et ce que de l'air et de la poussière de charbon entrent dans le tuyau d'air primaire (6) avec un répartition régulière.
  2. Brûleur selon la revendication 1,
       caractérisé en ce qu'
       un étranglement (11) est monté en amont de l'entrée dans le tube d'air primaire (6).
  3. Brûleur selon la revendication 2,
       caractérisé en ce que
       l'étranglement (11) est du type Venturi.
  4. Brûleur selon au moins l'une des revendications 1 à 3,
       caractérisé en ce que
       l'organe de rupture de faisceau (9) est constitué d'une pluralité d'éléments de rupture (10) en forme de tige disposés à distance, et de préférence disposés sur un secteur de cercle.
EP95115733A 1994-10-06 1995-10-06 Procédé et brûleur pour la combustion d'un combustible pulvérisé Expired - Lifetime EP0706007B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4435640A DE4435640C2 (de) 1994-10-06 1994-10-06 Brenner zur Verbrennung von staubförmigem Brennstoff
DE4435640 1994-10-06

Publications (3)

Publication Number Publication Date
EP0706007A2 EP0706007A2 (fr) 1996-04-10
EP0706007A3 EP0706007A3 (fr) 1997-05-02
EP0706007B1 true EP0706007B1 (fr) 2001-04-04

Family

ID=6530051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95115733A Expired - Lifetime EP0706007B1 (fr) 1994-10-06 1995-10-06 Procédé et brûleur pour la combustion d'un combustible pulvérisé

Country Status (4)

Country Link
EP (1) EP0706007B1 (fr)
AT (1) ATE200347T1 (fr)
DE (2) DE4435640C2 (fr)
ES (1) ES2156595T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100441947C (zh) * 2003-12-16 2008-12-10 阿尔斯托姆动力锅炉有限公司 用于燃烧灰粉状燃料的圆形燃烧器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404398B (de) * 1996-12-04 1998-11-25 Voest Alpine Ind Anlagen Brenner für die verbrennung von feinkörnigen bis staubförmigen, festen brennstoffen
DE102005046831A1 (de) * 2005-09-29 2007-04-12 Küppersbusch Großküchentechnik GmbH Staubfeuerungsvorrichtung
DE102006011326C5 (de) * 2006-03-09 2015-03-19 Alstom Technology Ltd. Rundbrenner
DE202008009650U1 (de) * 2008-07-18 2009-11-26 Ammann Schweiz Ag Mehrstoff-Brenner
AT524888A1 (de) * 2021-03-23 2022-10-15 Mme Eng E U Ultra-Low-NOx-Brenner

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5984008A (ja) * 1982-11-08 1984-05-15 Babcock Hitachi Kk 微粉炭燃焼装置
JPS604706A (ja) * 1983-06-23 1985-01-11 Babcock Hitachi Kk 微粉炭バ−ナ
US4517904A (en) * 1984-02-28 1985-05-21 Riley Stoker Corporation Furnace, burner and method for burning pulverized coal
EP0445938B1 (fr) * 1990-03-07 1996-06-26 Hitachi, Ltd. Brûleur à charbon pulvérisé, chaudière au charbon pulvérisé et procédé pour la combustion de charbon pulvérisé
ES2099161T3 (es) * 1990-06-29 1997-05-16 Babcock Hitachi Kk Sistema de combustion.
DE4102610A1 (de) * 1991-01-25 1992-07-30 Ver Kraftwerks Ag Peitz Nieder Kohlenstaub-drallbrenner
DE4217879A1 (de) * 1992-05-29 1993-12-02 Babcock Energie Umwelt Brenner für staubförmigen Brennstoff

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100441947C (zh) * 2003-12-16 2008-12-10 阿尔斯托姆动力锅炉有限公司 用于燃烧灰粉状燃料的圆形燃烧器

Also Published As

Publication number Publication date
EP0706007A2 (fr) 1996-04-10
ATE200347T1 (de) 2001-04-15
DE4435640A1 (de) 1996-04-18
EP0706007A3 (fr) 1997-05-02
ES2156595T3 (es) 2001-07-01
DE4435640C2 (de) 2001-01-04
DE59509155D1 (de) 2001-05-10

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