EP2283278B1 - Brenner mit peripheren injektionspunkten für axialen luftfluss - Google Patents

Brenner mit peripheren injektionspunkten für axialen luftfluss Download PDF

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Publication number
EP2283278B1
EP2283278B1 EP09745972.1A EP09745972A EP2283278B1 EP 2283278 B1 EP2283278 B1 EP 2283278B1 EP 09745972 A EP09745972 A EP 09745972A EP 2283278 B1 EP2283278 B1 EP 2283278B1
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EP
European Patent Office
Prior art keywords
burner
downstream
air supply
air
upstream
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.)
Active
Application number
EP09745972.1A
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English (en)
French (fr)
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EP2283278A2 (de
Inventor
Jean-Claude Pillard
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.)
Fives Pillard SA
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Fives Pillard SA
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Publication of EP2283278B1 publication Critical patent/EP2283278B1/de
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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
    • F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • 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
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners

Definitions

  • the present invention relates to a burner, in particular a burner for a cement plant.
  • a burner of the type comprising a central air supply pipe at the end of which is disposed a flame stabilizer, at least one central fuel supply pipe disposed in the central air supply pipe and opening through the flame stabilizer, at least one peripheral fuel supply pipe surrounding the central air supply pipe, and two peripheral annular air supply pipes representing between 5 and 15% of the air introduced by the burner, one of which comprises means for imparting a tangential component to the air coming out of it, the other peripheral annular air supply duct surrounding any other duct of the burner being shaped so that the air which fate has an axial flow.
  • the present invention aims to provide a burner which, at equal quality, can operate with a higher proportion of poor fuels.
  • the axial air flow which is the radially more external flow output of the burner, is angularly discontinuous, the corresponding flow elements being spaced apart from each other. Therefore, each radial flow element improves combustion by carrying with it ambient air in the home whose temperature (close to 1000 ° C) is significantly higher than that directly from the burner. As a result, the temperature of the flame becomes greater (close to 1800 ° C), which makes it possible to use a greater proportion of poor fuels.
  • each of these burners 1 has a central feed pipe in the air 2 at the end of which is disposed a flame stabilizer 3, at least one central fuel supply pipe 4 disposed in the central air supply pipe 2 and opening through the flame stabilizer 3, to the at least one peripheral fuel supply pipe 5 surrounding the central air supply pipe 2, and two peripheral annular air supply pipes 6, 7.
  • These two peripheral pipes 6, 7 allow the introduction into the combustion chamber. approximately 5 and 15% of the air introduced by the burner 1, and preferably between 7 and 12%.
  • One of these two peripheral air supply ducts 6, 7 comprises means 8 which make it possible to impart a tangential component to the air coming out of it.
  • this pipe 6 is shaped to allow a variation of the flow of this air by the relative displacement of the two tubes 9, 10 which delimit.
  • the tube 9 delimiting it externally also delimits internally the other peripheral air supply duct 7.
  • this downstream adjoining tube 9 delimits these two ducts 6, 7 only at their downstream ends, these ducts 6, 7 being fed by the same upstream peripheral duct 11.
  • the inner tube 10 delimiting internally the tangential flow air supply peripheral duct 6 carries, with respect to the downstream adjacent tube, grooves 8 having an inclination with respect to the axis 12 burner 1 to confer the tangential component to this stream.
  • These grooves 8 are shaped so that their inclination is variable depending on the axial position with respect to the downstream end of the inner tube 10.
  • the downstream adjacent tube 9, on the one hand is radially sufficiently close to the inner tube 10 so that the air flowing in the peripheral pipe 6 is constrained to circulate in these grooves 8, and, on the other hand, comprises a conical flare 13 at its downstream end.
  • the air coming from the grooves 8 has a flow whose tangential component corresponds to the angle of inclination of the grooves 8 to the point where the air can be released due to the conical flare.
  • the conical flare 13a does not have a constant angle according to the axial progression as is the case in the first two embodiments, but on the contrary has an increasing angle for axial progression from upstream to downstream. This promotes the bonding of the air streams on the surface of the tapered flare and avoids recirculation and / or eddies in the space defined by this flare and the associated risks of wear.
  • the other peripheral air supply duct 7 surrounds all the other ducts 2, 4, 5, 6 of the burner 1 and is shaped so that the air leaving it has an axial flow. More simply, it does not include a member that can confer a tangential component to the air circulating therein.
  • the air leaving the axial flow air supply pipe 7 represents 50 to 75% of the air leaving the assembly formed by the two peripheral air supply pipes 6, 7.
  • the opening of this pipe is formed by a series of fixed-section air injection points 14 which are angularly distributed over the periphery of the pipe 7.
  • these injection points 14 are all identical and angularly regularly distributed. This angular discontinuity axial flow allows a significant entrainment of the air in the home, at the burner 1, drive followed by its mixing with the air leaving the burner 1 and its incorporation into the flame.
  • each air injection point 14 has an angular extent whose value is between one third and one tenth of the value of the angular gap separating two adjacent air injection points 14. , the gap being measured adjacent edge adjacent edge.
  • the flow velocity of the air leaving the peripheral annular axial flow pipe 7 is between 150 and 350 m / s, and preferably between 200 to 250 m / s. These values concern the burner 1 under normal operating conditions.
  • each injection point 14 is formed by a single orifice 14 which, in these examples, has a circular cross section.
  • each orifice 14 is the downstream end of a bore 15 which is formed through a downstream annular wall 16.
  • This downstream annular wall 16 extends perpendicularly to the axis 2 of the burner 1 and joins the downstream ends of the two tubes 9, 17 which delimit the axial flow air supply peripheral duct 7.
  • the downstream annular wall 16, the downstream adjoining tube 9 and the outer tube 17 which delimits externally the peripheral duct axial flow air supply 7 are secured to one another.
  • the downstream boundary tube 9 is an annular shoulder protruding from the downstream annular wall 16, and the latter is connected to the outer tube 17 by a weld bead 18.
  • each bore 15 has a convergent conical shape from upstream to downstream. More specifically, each piercing 15 comprises a conical reduction portion 20 which makes it possible to pass from the continuous annular cross-section 21 to the cross-section of each orifice 14, by limiting the turbulence and the pressure losses related to the circulation of the water. 'air.
  • the value of the half-angle at the apex of the corresponding cone is about 30 °.
  • the bore 15 comprises, between the orifice 14 and the reduction portion 20, a second conical portion 22 whose value of the half-angle at the top is between 3 ° and 12 ° (preferably about 7 °). This portion 22 makes it possible to confer a high speed on the air leaving the corresponding orifice and reduces the risk of clincker deposition around the orifices 14 which could cause their obstruction more or less important.
  • the burner 1 comprises a deflector 23, 24 format a baffle which is adapted to circulate a portion of the air flowing in the axial flow air supply pipe 7 along the upstream face 25 of the wall downstream ring 16, between two adjacent holes 15.
  • this "fresh" air cooled the downstream end of this peripheral pipe 7 as well as the downstream end of the other peripheral air supply pipe 6, because the downstream annular wall 16 and the downstream boundary tube 9 are one and the same structural element.
  • This makes it possible to limit the significant heating of the downstream end of the two peripheral air supply pipes 6, 7 (due to the immediate proximity of the ambient air resulting from its entrainment by the different axial flow air jets ).
  • the deflector 23, 24 is fixed with respect to the downstream annular wall 16, and thus with respect to the bores 15.
  • the deflector 23 is formed by a series of walls 23 perpendicular to the axis 12 of the burner 1, each disposed upstream, at a distance and in front of a bore 15. Therefore, to pass by a bore 15, the air flow is forced to bypass these walls 23 and thus to come lick the upstream face 25 of the downstream annular wall 16 in the angular sectors between two orifices 14 adjacent.
  • the deflector 24 is formed by an upstream boundary tube 24 which delimits between them the two peripheral air supply pipes 6, 7.
  • the downstream end of this upstream boundary tube 24 is located axially downstream of the upstream end of the downstream adjacent tube 9, and radially between the outer tube 17 and the 9.
  • the passage section between the upstream boundary tube 24 and the inner tube 10 is at least partially obstructed upstream of the upstream end of the downstream adjacent tube 9.
  • this passage section is completely obstructed by an upstream annular wall 26 which is perpendicular to the axis 12 of the burner 1 (this wall 26 being welded to the inner tube 10, there is a clearance with the upstream boundary tube 24 which is fixed by spacers 27 to the outer tube 17 ).
  • the present invention is not limited to the two embodiments described above.
  • each injection point is formed either by two contiguous orifices separated from each other by an internal angular gap at most equal to the angular extent of each of the two orifices (the angular gap separating two adjacent injection points can then be equal to at least twice the angular extent of the injection point), or three contiguous orifices whose central orifice is separated from each of the other two by an internal angular gap at most equal to the angular extent of each of the three orifices, the internal gap being taken adjacent edge adjacent edge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Gas Burners (AREA)
  • Air Supply (AREA)

Claims (14)

  1. Brenner (1), der eine zentrale Luftversorgungsleitung (2) umfasst, an deren Ende ein Flammenstabilisator (3) angeordnet ist, mindestens eine zentrale Brennstoffversorgungsleitung (4), die in der zentralen Luftversorgungsleitung (2) angeordnet ist und durch den Flammenstabilisator (3) heraus mündet, mindestens eine umfängliche Brennstoffversorgungsleitung (5), die die zentrale Luftversorgungsleitung (2) umgibt, und zwei ringförmige umfängliche Luftversorgungsleitungen (6, 7), die zwischen 5 und 15 % der Luft darstellen, die von dem Brenner (1) eingeführt wird, und von welchen eine (6) der zwei Leitungen (6, 7) Mittel (8) umfasst, die es erlauben, der Luft, die aus ihnen austritt, eine tangentiale Komponente zu verleihen, während die andere Leitung (7), die jede andere Leitung (2, 4, 5, 6) des Brenners (1) umgibt, derart ausgestaltet ist, dass die Luft, die aus ihr austritt, einen axialen Fluss hat, wobei die Öffnung (14) der umfänglichen ringförmigen Luftversorgungsleitung mit axialem Fluss (7) durch eine Reihe von Luftinjektionspunkten (14) mit festgelegtem Querschnitt gebildet ist, die winkelig auf dem Umfang der Leitung (7) verteilt sind, dadurch gekennzeichnet, dass jeder Luftinjektionspunkt (14) ein Winkelmaß aufweist, dessen Wert zwischen einem Drittel und einem Zehntel des Werts des Winkelspalts, der zwei nebeneinanderliegende Luftinjektionspunkte (14) trennt, liegt, dadurch, dass jeder Luftinjektionspunkt (14) aus einer einzigen Öffnung gebildet ist, und dadurch, dass jede Öffnung (14) das stromabwärtige Ende einer Bohrung (15) ist, die durch eine stromabwärtige Ringwand (16) hergestellt wird, wobei sich die stromabwärtige Ringwand (16) senkrecht zu der Achse (12) des Brenners (1) von einer zum anderen der zwei Röhren (10, 17), die die umfängliche ringförmige Luftversorgungsleitung mit axialem Fluss (7) abgrenzen, zu dem stromabwärtigen Ende dieser zwei Röhren (10, 17) erstreckt.
  2. Brenner (1) nach Anspruch 1, dadurch gekennzeichnet, dass jeder Injektionspunkt aus zwei angrenzenden Öffnungen gebildet ist, die voneinander durch einen Winkelspalt getrennt sind, der maximal gleich dem Winkelmaß jeder dieser zwei Öffnungen ist.
  3. Brenner (1) nach Anspruch 1, dadurch gekennzeichnet, dass jeder Injektionspunkt aus drei angrenzenden Öffnungen gebildet ist, von welchen die zentrale Öffnung von jeder der zwei anderen durch einen Winkelspalt getrennt ist, der mindestens gleich dem Winkelmaß jeder der drei Öffnungen ist.
  4. Brenner (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Bohrung (15) eine konische Form hat, die von stromaufwärts nach stromabwärts konvergiert.
  5. Brenner (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass jede Öffnung (14) einen geraden kreisförmigen Querschnitt hat.
  6. Brenner (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass jede Öffnung einen gestreckten geraden Schnitt hat, dessen Längsrichtung zu der radialen Richtung senkrecht ist.
  7. Brenner (1) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Bohrung (15) einen konischen Verringerungsabschnitt (20) umfasst, dessen Halbwinkelwert an dem Scheitel etwa 30° beträgt.
  8. Brenner (1) nach Anspruch 7, dadurch gekennzeichnet, dass die Bohrung (15) zwischen der Öffnung (14) und dem Verringerungsabschnitt (20) einen konischen Beschleunigungsabschnitt (22) umfasst, dessen Halbwinkelwert am Scheitel zwischen 3° und 12° liegt.
  9. Brenner (1) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass er fest mit der stromabwärtigen Ringwand (16) verbunden ist, wobei eine stromabwärtige angrenzende Röhre (9) die zwei umfänglichen ringförmigen Luftversorgungsleitungen (6, 7) an deren stromabwärtigem Ende abgrenzt.
  10. Brenner (1) nach Anspruch 9, dadurch gekennzeichnet, dass die angrenzende stromabwärtige Röhre (9) an ihrem stromabwärtigen Ende eine konische Aufweitung (13a) umfasst, die einen Winkel besitzt, der für ein axiales Fortschreiten von stromaufwärts nach stromabwärts zunimmt.
  11. Brenner (1) nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass er einen Ablenker (23, 24) umfasst, der eine Schikane bildet, die angepasst ist, um einen Teil der Luft, die in der umfänglichen ringförmigen Luftversorgungsleitung mit axialem Fluss (7) zirkuliert, entlang der stromaufwärtigen Fläche (25) der stromabwärtigen ringförmigen Wand (16) zwischen zwei nebeneinanderliegenden Bohrungen (15) zirkulieren zu lassen.
  12. Brenner (1) nach Anspruch 11, dadurch gekennzeichnet, dass der Ablenker (23, 24) in Bezug auf die stromabwärtige Ringwand (16) stationär ist.
  13. Brenner (1) nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass der Ablenker (23) aus einer Reihe von Wänden (23) gebildet ist, die zu der Achse (12) des Brenners (1) senkrecht sind, die jeweils stromaufwärts, beabstandet und gegenüber einer Bohrung (15) angeordnet sind.
  14. Brenner (1) nach Anspruch 11 oder 12, die von Anspruch 8 oder 9 abhängen, dadurch gekennzeichnet, dass der Ablenker (24) von einer stromaufwärtigen angrenzenden Röhre (24) gebildet ist, die die zwei umfänglichen ringförmigen Luftversorgungsleitungen (6, 7) untereinander abgrenzt, und deren stromabwärtiges Ende stromabwärts des stromaufwärtigen Endes der stromabwärtigen Röhre (9) liegt und radial zwischen der externen Röhre (17), die die umfängliche ringförmige Luftversorgungsleitung mit axialem Fluss (7) außen abgrenzt, und der stromabwärtigen angrenzenden Röhre (9) abgrenzt, wobei der Durchgangsquerschnitt zwischen der stromaufwärtigen angrenzenden Röhre (24) und der inneren Röhre (10), die die umfängliche ringförmige Luftversorgungsleitung mit tangentialem Fluss (6) innen abgrenzt, stromaufwärts des stromaufwärtigen Endes der angrenzenden stromabwärtigen Röhre (9) teilweise verschlossen ist.
EP09745972.1A 2008-04-28 2009-04-21 Brenner mit peripheren injektionspunkten für axialen luftfluss Active EP2283278B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0852836A FR2930626B1 (fr) 2008-04-28 2008-04-28 Bruleur a points peripheriques d'injection d'air a flux axial
PCT/FR2009/050733 WO2009138653A2 (fr) 2008-04-28 2009-04-21 Brûleur à points périphériques d'injection d'air à flux axial

Publications (2)

Publication Number Publication Date
EP2283278A2 EP2283278A2 (de) 2011-02-16
EP2283278B1 true EP2283278B1 (de) 2018-10-31

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP09742256.2A Active EP2283277B1 (de) 2008-04-28 2009-04-07 Brenner
EP09745972.1A Active EP2283278B1 (de) 2008-04-28 2009-04-21 Brenner mit peripheren injektionspunkten für axialen luftfluss

Family Applications Before (1)

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EP09742256.2A Active EP2283277B1 (de) 2008-04-28 2009-04-07 Brenner

Country Status (6)

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EP (2) EP2283277B1 (de)
CN (2) CN102016413B (de)
DK (1) DK2283278T3 (de)
ES (1) ES2707794T3 (de)
FR (1) FR2930626B1 (de)
WO (2) WO2009136058A2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20120292A1 (it) * 2012-11-27 2014-05-28 Alberto Benfenati Bruciatore
FR3024765B1 (fr) * 2014-08-06 2016-07-29 Fives Pillard Bruleur a injection d'air ou de gaz ajustable
CN113405093A (zh) * 2021-05-06 2021-09-17 中国科学院工程热物理研究所 燃料喷口、燃烧装置及燃烧控制方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3027587A1 (de) * 1980-07-21 1982-02-25 Klöckner-Humboldt-Deutz AG, 5000 Köln Brenner fuer feste brennstoffe
CN1012918B (zh) * 1987-10-29 1991-06-19 三菱矿业水泥株式会社 细粉状固体燃料燃烧器
DE3933050C2 (de) * 1989-10-04 2000-06-15 Pillard Feuerungen Gmbh Verfahren zum Betreiben eines Brenners für Drehrohröfen und Brenner hierfür
FR2717884B1 (fr) * 1994-03-24 1996-06-07 Lorraine Laminage Brûleur à gaz pour fours industriels.
US5829369A (en) * 1996-11-12 1998-11-03 The Babcock & Wilcox Company Pulverized coal burner
FR2780489B1 (fr) * 1998-06-24 2000-09-08 Pillard Chauffage Perfectionnement aux bruleurs comportant au moins trois conduits d'alimentation en air, dont deux axial et en rotation, concentriques avec au moins une alimentation-en combustible, et un stabilisateur central
FR2792393B1 (fr) * 1999-04-16 2001-06-29 Pillard Chauffage Bruleur a plusieurs combustibles
US6315551B1 (en) * 2000-05-08 2001-11-13 Entreprise Generale De Chauffage Industriel Pillard Burners having at least three air feed ducts, including an axial air duct and a rotary air duct concentric with at least one fuel feed, and a central stabilizer
ITMI20020611A1 (it) * 2002-03-22 2003-09-22 Danieli Off Mecc Bruciatore
FR2887597B1 (fr) * 2005-06-27 2010-04-30 Egci Pillard Conduite annulaire et bruleur comportant une telle conduite
FR2892498B1 (fr) * 2005-10-21 2007-12-28 Lafarge Sa Bruleur pour four a clinker
DE102005053819A1 (de) * 2005-11-11 2007-05-16 Khd Humboldt Wedag Gmbh Drehofenbrenner
FR2901852B1 (fr) * 2006-05-30 2010-10-22 Egci Pillard Conduite annulaire a double flux et bruleur comportant une telle conduite

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2283278A2 (de) 2011-02-16
EP2283277A2 (de) 2011-02-16
CN102016413A (zh) 2011-04-13
WO2009138653A3 (fr) 2010-01-14
FR2930626B1 (fr) 2010-05-21
ES2707794T3 (es) 2019-04-05
WO2009138653A2 (fr) 2009-11-19
CN102016412B (zh) 2012-07-18
WO2009136058A2 (fr) 2009-11-12
CN102016412A (zh) 2011-04-13
DK2283278T3 (en) 2019-02-11
FR2930626A1 (fr) 2009-10-30
WO2009136058A3 (fr) 2010-01-14
EP2283277B1 (de) 2018-11-14
CN102016413B (zh) 2014-04-02

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