EP0674135B1 - Gasbrenner für Industrieöfen - Google Patents

Gasbrenner für Industrieöfen Download PDF

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Publication number
EP0674135B1
EP0674135B1 EP95400603A EP95400603A EP0674135B1 EP 0674135 B1 EP0674135 B1 EP 0674135B1 EP 95400603 A EP95400603 A EP 95400603A EP 95400603 A EP95400603 A EP 95400603A EP 0674135 B1 EP0674135 B1 EP 0674135B1
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EP
European Patent Office
Prior art keywords
burner
holes
series
air
gas
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
EP95400603A
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English (en)
French (fr)
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EP0674135A1 (de
EP0674135B2 (de
Inventor
Alain Usai
Serge Silvestrini
Jean-Claude Dieuloufet
Philippe Domini
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0674135A1 publication Critical patent/EP0674135A1/de
Application granted granted Critical
Publication of EP0674135B1 publication Critical patent/EP0674135B1/de
Publication of EP0674135B2 publication Critical patent/EP0674135B2/de
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Expired - Lifetime legal-status Critical Current

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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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F23D14/24—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other at least one of the fluids being submitted to a swirling motion

Definitions

  • the invention relates to a gas burner, of the type used in industrial ovens, for example in furnaces for heating steel products, such as slab ovens, or treatment ovens thermal, etc ...
  • These burners are high power burners, of the order of 1000 to 6000 therms or more, supplied with particularly in steel gas (mixed gas, oven gas coke ...) under low pressure ( ⁇ 1 bar).
  • burners of this type which generally have multiple channels fuel gas concentric and air, opening at the level of the burner nose, downstream from which combustion takes place.
  • burners with a central supply channel in combustible gas, surrounded by two annular channels concentric air supply we also know other burners, studied to improve the mixing of combustible and oxidizing gas, and therefore combustion, in which the combustible gas arrives at the burner nose by an annular channel located between a central channel and a peripheral annular channel, these two channels serving to the combustion air supply.
  • the invention therefore aims to reduce the rate nitrogen oxide in the flue gases, while ensuring good combustion and good structure of flame, despite the variations in power which may be required when implementing burners.
  • the combination of the flow diverging flue gas and vortex flow combustion air duct when these two streams near the burner nose, at a strong mixing of gas and air, and therefore at a homogenization of the mixture and an improvement in the combustion.
  • the gas jets from the orifices of gas outlet and directed outwards tend to widen the flame by giving it a flared shape, thin cup shape, high area flame temperature being constituted only by the wall of this cup.
  • the time of combustion products stay in this high area temperature is reduced, compared to a higher flame concentrated which defines a high temperature area under form of a substantially cylindrical full volume, in which combustion products stay longer long time.
  • the nose of the burner has, in the center of the first series gas passage orifices, a protruding part, outward from the burner, relative to the surface substantially flat frontal, perpendicular to the axis of the burner, where the said first and second open series of orifices.
  • This protruding part prevents that occurs, in the immediate vicinity of the gas orifices, a recirculation of combustion products which would disturb the gas outlet. However, it promotes this recirculation at a greater distance from the nose of the burner, which tends to quickly combustion products from the high temperature zone, and therefore to further reduce the amount of nitrogen oxides trained.
  • the burner 1 comprises a supply box 2 in combustible gas and air, formed by a central channel 3 gas supply, oriented in the axial direction X of the burner, surrounded by a first annular supply channel 4 air, and a second peripheral annular channel 5 also supplied with air. These three coaxial channels are supplied with gas and air respectively by respective supply lines 6, 7, 8.
  • the burner 1 also has a nose 10, again called diffuser, usually made of a material ceramic.
  • the nose 10 consists of a plate 11 thick covering the axial ends of different channels ensuring sealing between them, and which is inserted in a housing fitted out in the internal lining of the oven 12, being held there by fixing means, not shown, on the wall 13 from the oven.
  • the upstream face of the burner nose has a flat front surface 17 into which the orifices 14 for the passage of gas and the orifices 15, and a peripheral annular part, 18 prominent relative to to the said front surface, on the surface of which open the holes 16.
  • the gas passage orifices 14 are inclined by relative to the axial direction X of the burner, forming with it an angle ⁇ between 15 and 25 °.
  • the air passage openings 15 are made of so that the axis of each hole is located in a plane parallel to the axial direction of the burner and tangent to circle C2, and inclined in this plane, by angle ⁇ from 15 to 25 ° relative to said direction axial (see Figure 2).
  • the orifices 15 are therefore oriented in a helix, so that the air flow which escapes has a rotational movement around the X axis of the burner.
  • the orifices 16 are inclined at an angle ⁇ between 0 ° and 10 ° relative to the axis and from preferably around 5 °. Too sharp an angle leads indeed to a shortening of the flame such that, in some cases, elements or organs of the furnace close of the burner may be raised too high by temperature.
  • the burner nose has, in its part central, between the holes 14, a frustoconical part 19 protruding from the front surface 17, the truncated cone having its large base at this frontal surface. Between the frustoconical part 19 and the prominent part 18 is thus formed a groove annular 20 of trapezoidal section, in which open the gas passage orifices 14 and the holes 15 of the first series of through holes of air.
  • the orifices 14 for the passage of gases emerge at the front surface 17 in a position angular intermediate between the outlets of two orifices 15 for adjacent air passage (FIG. 3). So, the swirling air flow coming from the orifices 15 intersects the gas flow from ports 14 to close proximity to the front surface 17, thereby creating strong mixing of gas and air, and therefore a mixture homogeneous ensuring very good combustion.
  • the inclination of the passage openings 14 gas causes the air-gas mixture to tend to form a flared cup-shaped curtain, in which the temperature due to combustion is maximum.
  • the central zone of this section in the axis of the burner, is relatively clear and allows downstream of the burner a recirculation of combustion products which can thus quickly leave the hottest area, which, as previously stated, is favorable for the decrease in the rate of nitrogen oxide formed.
  • the orifices 16 for peripheral air passage have a chamfer on the side of the supply channel conical 21, with an apex angle of around 30 °, which widens the entry of these orifices and has the effect of reducing the pressure losses in the circuit formed by the channel peripheral 5 and the said orifices, and therefore to increase, at constant pressure, the air outlet speed.
  • the distribution of the air flow rates in the annular 4 and peripheral 5 channels makes it possible to adjust the length of the flame as required. Indeed, for a given total air flow, for example 3900 Nm 3 / h, in the case of a burner providing 3500 thermies / hour, if this flow is distributed between the two channels 4 and 5 and therefore between the two series of orifices 15 and 16, for example 1900 Nm 3 / h for the peripheral air (passing through orifices 16) and 2000 Nm 3 / h for the central air (passing through orifices 15) the speeds at the outlet of these orifices are substantially equal, of the order of 95 m / s. Under these conditions, combustion will start, as indicated above, in the immediate vicinity of the nose 10, and a short flame will be obtained.
  • a length flame intermediate can be obtained by adapting correctly the ratio of air flows between air central and peripheral air.
  • the flow central air will however be limited to 50% at most total air flow to avoid a too short flame including the hot spot is too close to the oven wall or slab support rails.
  • the invention makes it possible to obtain a very good combustion and low oxide content nitrogen from combustion products.
  • the finish side is determined to cause a air rotation in channel 4 in the same direction as the rotation induced by the inclination of the orifices 15 of the burner nose.

Landscapes

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

Claims (12)

  1. Gasbrenner hoher Leistung, insbesondere für Industrieöfen, mit einem zentralen Kanal (3) zur Zufuhr von Brenngas, mit zwei konzentrischen ringförmigen Kanälen (4, 5) zur Zufuhr von Luft und mit einem Brennerkopf (10), welcher aufweist:
    eine erste Anzahl von Gasdurchlassöffnungen (14), die kreisförmig angeordnet sind und die mit dem zentralen Kanal (3) in Verbindung stehen,
    eine zweite Anzahl von Luftdurchlassöffnungen (15), die kreisförmig um die Gasdurchlassöffnungen herum angeordnet sind und die mit dem ersten (4) der beiden ringförmigen Kanäle in Verbindung stehen und
    eine dritte Anzahl von Luftdurchlassöffnungen (16), die kreisförmig angeordnet sind und die mit dem zweiten (5) der beiden ringförmigen Kanäle in Verbindung stehen, der am Umfang angeordnet ist, dadurch gekennzeichnet, dass die Öffnungen (14) der ersten Anzahl bezüglich der Axialrichtung (X) des Brennerkopfes geneigt sind und zum Äusseren des Brenners hin divergieren, um einen divergenten Gasstrom zu erzeugen, dass die Öffnungen (15) der zweiten Anzahl schraubenlinienförmig angeordnet sind, um einen wirbelförmigen Luftstrom zu erzeugen, der den Gasstrom schneidet und dass der Brenner eine Anordnung aufweist, um die Verteilung der Luft zwischen der zweiten Anzahl von Öffnungen (15) und der dritten Anzahl von Öffnungen (16) zu modulieren.
  2. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass der Neigungswinkel (α) der Gasdurchlassöffnungen (14) bezüglich der Brennerachse zwischen 15 und 25° liegt.
  3. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass der Neigungswinkel (β) der Luftdurchlassöffnungen (15) der zweiten Anzahl von Öffnungen bezüglich der Axialrichtung des Brenners zwischen 15 und 25° liegt.
  4. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass der Neigungswinkel (γ) der Luftdurchlassöffnungen (16) der dritten Anzahl von Öffnungen bezüglich der Axialrichtung des Brenners zwischen 0 und 10° liegt.
  5. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass der Brennerkopf (10) in der Mitte der ersten Anzahl von Gasdurchlassöffnungen (14) einen in Richtung zur Aussenseite des Brenners bezüglich einer Vorderseite (17) des Kopfes hervorspringenden Abschnitt (19) aufweist, die im wesentlichen eben ist, senkrecht zur Brennerachse verläuft und in der die Öffnungen der ersten und der zweiten Anzahl münden.
  6. Brenner nach Anspruch 5, dadurch gekennzeichnet, dass der hervorspringende Abschnitt (19) im wesentlichen kegelstumpfförmig ist, wobei die grosse Basis auf Höhe der Vorderseite (17) angeordnet ist.
  7. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass sich die winkelmässige Anordnung einer jeden Gasdurchlassöffnung (14) in der im wesentlichen ebenen Vorderseite (17) des Kopfes, die senkrecht zur Brennerachse verläuft und in der diese erste Anzahl Öffnungen mündet, zwischen den entsprechenden winkelmässigen Anordnungen der Ausslässe zweier benachbarter Öffnungen der zweiten Reihe von Öffnungen (15) befindet.
  8. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass die Öffnungen (16) der dritten Anzahl von Öffnungen an ihren zum Umfangskanal (5) hin gerichteten Enden eine konische Abschrägung (21) aufweisen.
  9. Brenner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er Luftzufuhrleitungen (7, 8) aufweist, die tangential in den ringförmigen Kanälen (4, 5) münden.
  10. Brenner nach Anspruch 9, dadurch gekennzeichnet, dass die Luftzufuhrleitung (7) für den ersten Kanal (4) in diesem Kanal in einer derartigen Richtung mündet, dass die durch ihren tangentialen Eintritt in diesen Kanal in Rotation versetzte Luft die gleiche Richtung aufweist wie die durch die schraubenlinienförmige Anordnung der Öffnungen (15) der zweiten Anzahl hervorgerufene Rotation.
  11. Brenner nach Anspruch 1, dadurch gekennzeichnet, dass er eine Anordnung aufweist, um Brenngase in die Brennluft einzuführen.
  12. Brenner nach Anspruch 11, dadurch gekennzeichnet, dass er mit einer Anordnung zur teilweisen Rezirkulation der Verbrennungsabgase in die Brennluft versehen ist.
EP95400603A 1994-03-24 1995-03-20 Gasbrenner für Industrieöfen Expired - Lifetime EP0674135B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9403633A FR2717884B1 (fr) 1994-03-24 1994-03-24 Brûleur à gaz pour fours industriels.
FR9403633 1994-03-24

Publications (3)

Publication Number Publication Date
EP0674135A1 EP0674135A1 (de) 1995-09-27
EP0674135B1 true EP0674135B1 (de) 1999-06-23
EP0674135B2 EP0674135B2 (de) 2002-08-21

Family

ID=9461507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95400603A Expired - Lifetime EP0674135B2 (de) 1994-03-24 1995-03-20 Gasbrenner für Industrieöfen

Country Status (5)

Country Link
EP (1) EP0674135B2 (de)
AT (1) ATE181593T1 (de)
DE (1) DE69510395T3 (de)
ES (1) ES2132550T5 (de)
FR (1) FR2717884B1 (de)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2741702B1 (fr) * 1995-11-23 1997-12-26 Lorraine Laminage Bruleur a gaz pour four de rechauffage de produits siderurgiques
GB2316161A (en) * 1996-08-05 1998-02-18 Boc Group Plc Oxygen-fuel swirl burner
AT408796B (de) * 1999-04-29 2002-03-25 Dumag Ohg Brenner
US7476099B2 (en) 2002-03-16 2009-01-13 Exxonmobil Chemicals Patents Inc. Removable light-off port plug for use in burners
US6881053B2 (en) 2002-03-16 2005-04-19 Exxonmobil Chemical Patents Inc. Burner with high capacity venturi
US6846175B2 (en) 2002-03-16 2005-01-25 Exxonmobil Chemical Patents Inc. Burner employing flue-gas recirculation system
JP4264004B2 (ja) 2002-03-16 2009-05-13 エクソンモービル・ケミカル・パテンツ・インク ＮＯｘ低放出の改良型バーナーシステム
US7322818B2 (en) 2002-03-16 2008-01-29 Exxonmobil Chemical Patents Inc. Method for adjusting pre-mix burners to reduce NOx emissions
US6869277B2 (en) 2002-03-16 2005-03-22 Exxonmobil Chemical Patents Inc. Burner employing cooled flue gas recirculation
US6986658B2 (en) 2002-03-16 2006-01-17 Exxonmobil Chemical Patents, Inc. Burner employing steam injection
US6890172B2 (en) 2002-03-16 2005-05-10 Exxonmobil Chemical Patents Inc. Burner with flue gas recirculation
US6866502B2 (en) 2002-03-16 2005-03-15 Exxonmobil Chemical Patents Inc. Burner system employing flue gas recirculation
US6902390B2 (en) 2002-03-16 2005-06-07 Exxonmobil Chemical Patents, Inc. Burner tip for pre-mix burners
US6893251B2 (en) 2002-03-16 2005-05-17 Exxon Mobil Chemical Patents Inc. Burner design for reduced NOx emissions
US6893252B2 (en) 2002-03-16 2005-05-17 Exxonmobil Chemical Patents Inc. Fuel spud for high temperature burners
US6887068B2 (en) 2002-03-16 2005-05-03 Exxonmobil Chemical Patents Inc. Centering plate for burner
ITMI20020611A1 (it) * 2002-03-22 2003-09-22 Danieli Off Mecc Bruciatore
FR2930626B1 (fr) * 2008-04-28 2010-05-21 Fives Pillard Bruleur a points peripheriques d'injection d'air a flux axial
CN102012024A (zh) * 2010-11-12 2011-04-13 新兴能源装备有限公司 一种活性石灰回转窑发生炉的煤气燃烧器
WO2013091634A1 (en) * 2011-12-23 2013-06-27 Flsmidth A/S A method and a burner for introducing fuel into a burning zone of a kiln
US20150135723A1 (en) * 2012-02-21 2015-05-21 General Electric Company Combustor nozzle and method of supplying fuel to a combustor
US10197269B2 (en) * 2015-07-31 2019-02-05 Nuvera Fuel Cells, LLC Burner assembly with low NOx emissions
CN105588118B (zh) * 2016-03-09 2017-10-17 浙江尚鼎工业炉有限公司 一种燃气加热炉
CN106287705A (zh) * 2016-08-25 2017-01-04 郭玉 一种燃气喷枪
RU169821U1 (ru) * 2016-10-27 2017-04-03 Акционерное общество "ЕВРАЗ Объединенный Западно-Сибирский металлургический комбинат", АО "ЕВРАЗ ЗСМК" Многосопловая головка газокислородной горелки
EP3336428B1 (de) * 2016-12-15 2021-02-17 Fives Pillard Brenner mit niedrigen nox-emissionen
CN106765216A (zh) * 2017-02-27 2017-05-31 洛阳明远石化技术有限公司 燃烧器和尾气焚烧设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209811A (en) * 1963-03-28 1965-10-05 Loftus Engineering Corp Combination high velocity burner
US4728284A (en) * 1987-02-12 1988-03-01 Maxon Corporation Adjustable combustion rate air/fuel proportioned burner assembly
IT1235361B (it) * 1988-04-05 1992-06-30 Termo Tecnica Ceramica Spa Ugello di tipo misto aria e gas per bruciatori a gas, in particolare bruciatori aventi potenza termica piccola per forni di cottura

Also Published As

Publication number Publication date
ES2132550T3 (es) 1999-08-16
ES2132550T5 (es) 2002-12-16
ATE181593T1 (de) 1999-07-15
DE69510395D1 (de) 1999-07-29
FR2717884A1 (fr) 1995-09-29
EP0674135A1 (de) 1995-09-27
DE69510395T2 (de) 2000-01-13
EP0674135B2 (de) 2002-08-21
FR2717884B1 (fr) 1996-06-07
DE69510395T3 (de) 2003-04-17

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