EP2283278A2 - Bruleur a points peripheriques d'injection d'air a flux axial - Google Patents
Bruleur a points peripheriques d'injection d'air a flux axialInfo
- Publication number
- EP2283278A2 EP2283278A2 EP09745972A EP09745972A EP2283278A2 EP 2283278 A2 EP2283278 A2 EP 2283278A2 EP 09745972 A EP09745972 A EP 09745972A EP 09745972 A EP09745972 A EP 09745972A EP 2283278 A2 EP2283278 A2 EP 2283278A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- burner
- air
- downstream
- upstream
- tube
- 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
Links
- 230000002093 peripheral effect Effects 0.000 title claims abstract description 34
- 238000002347 injection Methods 0.000 title claims abstract description 21
- 239000007924 injection Substances 0.000 title claims abstract description 21
- 238000011144 upstream manufacturing Methods 0.000 claims description 26
- 239000000446 fuel Substances 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 claims 1
- 239000003570 air Substances 0.000 description 59
- 239000012080 ambient air Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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 by means of 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 exiting from it, the other peripheral annular air supply duct surrounding any other burner duct 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 opening of the peripheral annular axial flow air supply pipe is formed by a series of fixed section air injection points which are angularly distributed over the periphery of the pipe, each having an angular extent which is between one-third and one-tenth the value of the angular gap between two adjacent air injection points.
- the axial air flow which is the radially more external flow output of the burner is angularly discontinuous, the corresponding flow elements being spaced from each other.
- each radial flow element improves combustion by carrying with it the ambient air in the furnace whose temperature (close to 1000 ° C.) is very much higher than that coming directly from the burner.
- the temperature of the flame becomes greater (close to 1800 ° C.), which makes it possible to use a greater proportion of poor fuels.
- FIG. 1 is a partial view in longitudinal section of the downstream end of the burner according to a first embodiment of the present invention
- FIG. 2 is a view similar to FIG. 1, illustrating a second embodiment
- FIG 3 is a view similar to Figures 1 and 2, illustrating a third embodiment.
- the present embodiments relate to burners 1 for cement plants.
- 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 least one peripheral fuel supply pipe 5 surrounding the central air supply duct 2, and two peripheral annular air supply ducts 6, 7.
- These two peripheral ducts 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 defining it externally also delimits internally the other peripheral air supply pipe 7.
- this downstream adjoining tube 9 delimits these two lines 6, 7 that 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 13.
- 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 any member that can impart 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 of the axial flow allows a significant entrainment of the air in the hearth, 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 air injection points 14 adj. acents, the gap being measured adjacent edge to adjacent edge.
- 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 pipe 7.
- the downstream annular wall 16, the downstream adjacent tube 9 and the outer tube 17 which externally defines the peripheral axial flow supply air duct 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 boundary 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 ).
- 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 angular gap separating two adjacent injection points can then be equal to at least twice - or even one and a half times - the angular extent of the injection point), the inner gap being taken adjacent edge adjacent edge.
- the orifices could have a cross-section other than circular, for example elongated, the longitudinal direction of which is normal to the radial direction (for example in the form of an ellipse or rectangle (curved)).
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)
Abstract
Description
Claims
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 true EP2283278A2 (fr) | 2011-02-16 |
EP2283278B1 EP2283278B1 (fr) | 2018-10-31 |
Family
ID=40219387
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09742256.2A Active EP2283277B1 (fr) | 2008-04-28 | 2009-04-07 | Brûleur |
EP09745972.1A Active EP2283278B1 (fr) | 2008-04-28 | 2009-04-21 | Brûleur à points périphériques d'injection d'air à flux axial |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09742256.2A Active EP2283277B1 (fr) | 2008-04-28 | 2009-04-07 | Brûleur |
Country Status (6)
Country | Link |
---|---|
EP (2) | EP2283277B1 (fr) |
CN (2) | CN102016413B (fr) |
DK (1) | DK2283278T3 (fr) |
ES (1) | ES2707794T3 (fr) |
FR (1) | FR2930626B1 (fr) |
WO (2) | WO2009136058A2 (fr) |
Families Citing this family (3)
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)
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 |
-
2008
- 2008-04-28 FR FR0852836A patent/FR2930626B1/fr active Active
-
2009
- 2009-04-07 CN CN200980115151.9A patent/CN102016413B/zh active Active
- 2009-04-07 EP EP09742256.2A patent/EP2283277B1/fr active Active
- 2009-04-07 WO PCT/FR2009/050593 patent/WO2009136058A2/fr active Application Filing
- 2009-04-21 WO PCT/FR2009/050733 patent/WO2009138653A2/fr active Application Filing
- 2009-04-21 CN CN2009801149631A patent/CN102016412B/zh active Active
- 2009-04-21 ES ES09745972T patent/ES2707794T3/es active Active
- 2009-04-21 EP EP09745972.1A patent/EP2283278B1/fr active Active
- 2009-04-21 DK DK09745972.1T patent/DK2283278T3/en active
Non-Patent Citations (1)
Title |
---|
See references of WO2009138653A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009138653A2 (fr) | 2009-11-19 |
CN102016413B (zh) | 2014-04-02 |
EP2283277A2 (fr) | 2011-02-16 |
EP2283277B1 (fr) | 2018-11-14 |
WO2009136058A3 (fr) | 2010-01-14 |
ES2707794T3 (es) | 2019-04-05 |
CN102016412A (zh) | 2011-04-13 |
FR2930626B1 (fr) | 2010-05-21 |
CN102016413A (zh) | 2011-04-13 |
WO2009136058A2 (fr) | 2009-11-12 |
DK2283278T3 (en) | 2019-02-11 |
EP2283278B1 (fr) | 2018-10-31 |
CN102016412B (zh) | 2012-07-18 |
WO2009138653A3 (fr) | 2010-01-14 |
FR2930626A1 (fr) | 2009-10-30 |
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