EP0775868A1 - Gasbrenner für Aufwärmöfen für siderurgische Produkte - Google Patents

Gasbrenner für Aufwärmöfen für siderurgische Produkte Download PDF

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Publication number
EP0775868A1
EP0775868A1 EP96402273A EP96402273A EP0775868A1 EP 0775868 A1 EP0775868 A1 EP 0775868A1 EP 96402273 A EP96402273 A EP 96402273A EP 96402273 A EP96402273 A EP 96402273A EP 0775868 A1 EP0775868 A1 EP 0775868A1
Authority
EP
European Patent Office
Prior art keywords
burner
gas
orifices
nose
passage
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
Application number
EP96402273A
Other languages
English (en)
French (fr)
Other versions
EP0775868B1 (de
Inventor
Alain Usai
Serge Silvestrini
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
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0775868A1 publication Critical patent/EP0775868A1/de
Application granted granted Critical
Publication of EP0775868B1 publication Critical patent/EP0775868B1/de
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
    • 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
    • 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
    • F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/02—Casings; Linings; Walls characterised by the shape of the bricks or blocks used
    • F23M5/025—Casings; Linings; Walls characterised by the shape of the bricks or blocks used specially adapted for burner openings

Definitions

  • the present invention relates to a gas burner, of the type used in furnaces for heating steel products, such as slab ovens for example.
  • These burners are high-power burners, supplied in particular with steel gas (mixed gas, coke oven gas for example), and are placed in the roof of the reheating furnaces.
  • steel gas mixed gas, coke oven gas for example
  • burners of this type which generally comprise several concentric channels for supplying combustible gas and air, opening at the level of the burner nose, downstream of which combustion occurs.
  • burners of the “jet burner” type are known with very high gas ejection speed, greater than 100 meters per second.
  • the air and the combustion gas burn in the combustion chamber of the burner, and at the outlet of the burner, there is hot smoke, the combustion being completed.
  • This type of burner is commonly used in ovens requiring direct heating of the products, for example in coke agglomeration hoods, because the very high gas ejection speed makes it possible to heat a very localized area.
  • Such a type of burner is not suitable for furnaces for heating steel products because the heating they provide is very localized direct heating. Their use would cause temperature heterogeneity on the product to be reheated with the significant risk of the appearance of black marks and the risk of causing problems during the subsequent rolling operation (in the case of reheating the slabs).
  • burners called “flat flame” or so-called “flat flame”.
  • the combustion air is brought into rotation around the gas supply.
  • the flame due to the combustion of the air / gas mixture is generated downstream of the burner nose, in the burner, that is to say in the housing provided in the internal lining of the oven and in which the burner is inserted.
  • This tulip-shaped workpiece allows the flame to be pressed against the walls of said worker and against the walls of the roof of the oven.
  • This type of burner allowing indirect heating of the product by radiation from the roof of the oven, has a number of drawbacks.
  • the weak impulse of gases in this type of burner leads to poor mixing of the fumes inside the furnace and thus a heterogeneity of temperatures between the roof of the furnace and the steel product to be heated.
  • this type of burner by design, has a flared flat flame and therefore a certain black hole in the center of said flame, where it does not generate a flame. This phenomenon reinforces the problem of temperature heterogeneity.
  • this type of burner is not multi-fuel. It is only intended to operate on steel gas and cannot be adapted to operate on natural gas.
  • This type of burner requires a tulip-shaped burner, it is relatively expensive to operate because of the high cost of this type of burner. In addition, this type of workman is relatively fragile.
  • this type of burner has a low thermal efficiency, in the sense of its capacity to generate a temperature rise in the oven, because the useful heating surface on the roof of the oven of each burner is relatively small.
  • the flame due to the combustion of the air / gas mixture is generated downstream of the burner nose, in the opening, in the form of a ball.
  • This type of burner has three series of orifices, a first for the passage of gas, a second for the passage of air, arranged in a circle around the orifices for the passage of gas, generating a short flame, with a length of l 'order of 2 meters, and a third series of orifices for the passage of air, located at the periphery, generating a long flame, with a length of the order of 4.5 meters.
  • This type of burner is a burner for direct heating of steel products. It therefore has a drawback linked to this function, namely the heterogeneity of the temperatures at the level of the product to be heated, certainly less significant than in the case of "jet burners".
  • the object of the present invention is to propose a burner combining the direct heating and indirect heating function by radiation of the roof of the oven, having a large latitude for adjusting the heating power, making it possible to generate a uniform temperature of the roof of the oven, can use both steel and natural gas, while not producing too much nitrogen oxide.
  • the present invention also relates to an oven vault for heating steel products, characterized in that it comprises at least one housing 9, cylindrical with diameter D3, arranged in the internal lining of the oven vault, in which a burner is maintained according to the preceding claims, and in that the ratio between the diameter D2 of the crown of the orifices for the passage of air from the burner and the diameter D3 of the housing 9 is between 0.6 and 0.8, preferably equal at 0.68.
  • the ratio between the diameter D3 of the housing arranged in the internal lining of the oven roof and the distance between the front surface of the burner nose and the oven roof is between 0.9 and 1, preferably equal to 0.95.
  • the burner 1 comprises a box 2 for supplying combustible gas and air, formed by a central channel 3 for supplying the gas, oriented in the axial direction X of the burner, surrounded by an annular channel 4 for supplying d 'air.
  • the burner 1 also includes a nose 7 also called a diffuser, generally made of a ceramic material.
  • the nose 7 consists of a thick plate 8 which covers the axial ends of the different channels while ensuring the seal between them, and which is inserted in a housing 9, cylindrical with diameter D3, arranged in the internal coating of the roof of the oven, being held there by fixing means, not shown, on the wall of the oven.
  • the upstream face of the burner nose 7 has a flat front surface 13, facing the interior of the furnace.
  • the plate 8 of the burner nose 7 is traversed by a plurality of gas and air outlet orifices.
  • the orifices 10, connected to the gas supply channel 3 are coaxial with the axial direction X of the burner.
  • the plate 8 of the nose 7 of the burner is provided with six orifices 10, also distributed in a circle on the crown C1.
  • the orifices 12, connected to the air supply channel 4 are made so that the axis of each orifice is situated in a plane parallel to the axial direction of the burner and tangent to the crown C2, and inclined in this plane, by an angle ⁇ with respect to said axial direction.
  • the angle ⁇ is between 15 and 25 °.
  • the orifices 12 are therefore oriented in a helix, so that the air flow which escapes therefrom has a rotational movement around the axis X of the burner, thus creating a swirling air flow causing a vacuum which sucks the gas flow.
  • the plate 8 of the nose 7 of the burner is provided with eight orifices 12, also distributed in a circle on the crown C2.
  • the nose 7 of the burner has a part 14 recessed towards the inside of the burner with respect to the front surface 13, substantially planar, perpendicular to the axis X of the burner, into which the orifices 10 for the passage of gas and the orifices open 12 for air passage, the recessed part 14 and the front surface 13 being connected to each other by a connecting surface 15.
  • connection surface 15 between the front surface 13 and the recessed part 14 of the upstream face of the burner nose is substantially in the form of a truncated cone, the large base of which is located at the front surface 13.
  • the angle ⁇ of the truncated cone of the connecting surface 15 is between 20 and 40 °, preferably equal to 30 °.
  • the ratio D1 / D2 of the rings C1 and C2, respectively of the series of orifices 10 for the passage of gas and of the series of air passage openings is between 0.4 and 0.5.
  • this ratio D1 / D2 is less than 0.4, the flame is of the "jet" type, directly impacting the product, and in the case of the use of natural gas, there is separation of the flame and risk of extinction . If this ratio is greater than 0.5, the flame is very short, disturbed, and the burner overheats, especially if natural gas is used.
  • the ratio between the diameter D2 of the crown C2 of the series of air passage orifices 12 and the diameter D3 of the housing 9 arranged in the internal lining of the roof of the oven is between 0.6 and 0.8.
  • this ratio D2 / D3 is less than 0.6, a soft, poorly directed flame is produced, sensitive to variations in the internal pressure of the furnace. If this ratio is greater than 0.8, the flame is an airplane nozzle type torch, it there is a strong delamination of the flame if natural gas is used, and at high flow the flame is blown for all types of gas.
  • the ratio between the diameter D3 of the housing 9 fitted in the internal lining of the roof of the oven and the distance H between the front surface 13 of the burner nose and the roof of the oven is between 0.9 and 1.
  • this D3 / H ratio is less than 0.9, there is internal overheating and too much NOx production when using steel gas. If this ratio is greater than 1, the flame is badly directed and the combustion is incomplete.
  • This configuration allows the flame to develop in the housing 9 arranged in the roof of the oven. This flame is not directly pressed against the wall of the roof of the oven, but develops inside the oven in the form of a very obtuse angle cone, of the order of 160 to 170 °.
  • the flame develops inside the oven more or less pressed against the wall of the roof of the oven.
  • a ratio of diameters D1 / D2 equal to 0.40 or equal to 0.50 makes it possible to ensure that the burner will effectively combine the direct heating and indirect heating function by radiation from the roof of the oven.
  • a D1 / D2 ratio of 0.43 is very close to ideal if a steel gas is used, but is not completely satisfactory if natural gas is used.
  • a D1 / D2 ratio of 0.48 for example, is very close to ideal for natural gas, but causes sparks if a mixed gas is used at high flow rates and produces too much NOx.
  • the ratio between the diameter D3 and the distance H is optimum when it is between 0.93 and 0.97, preferably equal to 0.95.
  • Such a burner makes it possible to obtain heating of the furnace according to two combined modes, direct heating and indirect radiant heating, and this from a gas ejection speed equal to 40 meters per second.
  • Such a burner can thus operate with a gas ejection speed of 40 to 100 meters per second, which gives it great latitude in adjusting the heating power, while ensuring a homogeneous vault temperature.
  • Such a burner is multi-fuel, that is to say that it retains its properties regardless of the type of gas used, from natural gas to steel gas.

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)
  • Furnace Details (AREA)
EP96402273A 1995-11-23 1996-10-25 Gasbrenner für Aufwärmöfen für siderurgische Produkte Expired - Lifetime EP0775868B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9513905 1995-11-23
FR9513905A FR2741702B1 (fr) 1995-11-23 1995-11-23 Bruleur a gaz pour four de rechauffage de produits siderurgiques

Publications (2)

Publication Number Publication Date
EP0775868A1 true EP0775868A1 (de) 1997-05-28
EP0775868B1 EP0775868B1 (de) 1999-09-22

Family

ID=9484838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96402273A Expired - Lifetime EP0775868B1 (de) 1995-11-23 1996-10-25 Gasbrenner für Aufwärmöfen für siderurgische Produkte

Country Status (5)

Country Link
EP (1) EP0775868B1 (de)
AT (1) ATE184978T1 (de)
DE (1) DE69604366T2 (de)
ES (1) ES2136955T3 (de)
FR (1) FR2741702B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823593A3 (de) * 1996-08-05 1998-11-04 The BOC Group plc Emissionsarmer Wirbelbrenner
ES2159217A1 (es) * 1998-05-14 2001-09-16 Adiego Tomas Adiego Dispositivo para evitar perdidas termicas de la corona de llamas de un quemador.
WO2003081136A1 (en) * 2002-03-22 2003-10-02 Danieli & C. Officine Meccaniche S.P.A. Burner
WO2008070627A2 (en) * 2006-12-04 2008-06-12 Praxair Technology, Inc. Combustion with variable oxidant low nox burner
US20100139324A1 (en) * 2007-04-12 2010-06-10 Saint- Gobain Isover Internal combustion burner
JP2018522200A (ja) * 2015-07-31 2018-08-09 ヌヴェラ・フュエル・セルズ，エルエルシー ＮＯｘ放出が低減されたバーナーアセンブリ

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008011567B4 (de) * 2008-02-28 2010-01-28 Corall, Paul, Dipl.-Ing. Prüfeinrichtung zur Überprüfung der Funktionsfähigkeit von Rauchabzugsanlagen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2193464A5 (de) * 1972-07-21 1974-02-15 Airco Inc
FR2532405A1 (fr) * 1982-08-25 1984-03-02 Air Liquide Procede et dispositif d'allumage electrique d'un bruleur oxycombustible
EP0495690A1 (de) * 1991-01-16 1992-07-22 Sollac Mischer von Luft und Verbrennungsgas für Gasbrenner von Industrieöfen
EP0674135A1 (de) * 1994-03-24 1995-09-27 Sollac S.A. Gasbrenner für Industrieöfen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2193464A5 (de) * 1972-07-21 1974-02-15 Airco Inc
FR2532405A1 (fr) * 1982-08-25 1984-03-02 Air Liquide Procede et dispositif d'allumage electrique d'un bruleur oxycombustible
EP0495690A1 (de) * 1991-01-16 1992-07-22 Sollac Mischer von Luft und Verbrennungsgas für Gasbrenner von Industrieöfen
EP0674135A1 (de) * 1994-03-24 1995-09-27 Sollac S.A. Gasbrenner für Industrieöfen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823593A3 (de) * 1996-08-05 1998-11-04 The BOC Group plc Emissionsarmer Wirbelbrenner
ES2159217A1 (es) * 1998-05-14 2001-09-16 Adiego Tomas Adiego Dispositivo para evitar perdidas termicas de la corona de llamas de un quemador.
WO2003081136A1 (en) * 2002-03-22 2003-10-02 Danieli & C. Officine Meccaniche S.P.A. Burner
US7004408B2 (en) 2002-03-22 2006-02-28 Danieli & C. Officine Meccaniche S.P.A. Burner
WO2008070627A2 (en) * 2006-12-04 2008-06-12 Praxair Technology, Inc. Combustion with variable oxidant low nox burner
WO2008070627A3 (en) * 2006-12-04 2008-08-21 Praxair Technology Inc Combustion with variable oxidant low nox burner
US7549858B2 (en) 2006-12-04 2009-06-23 Praxair Technology, Inc. Combustion with variable oxidant low NOx burner
US7896647B2 (en) 2006-12-04 2011-03-01 Praxair Technology, Inc. Combustion with variable oxidant low NOx burner
US20100139324A1 (en) * 2007-04-12 2010-06-10 Saint- Gobain Isover Internal combustion burner
US9587822B2 (en) * 2007-04-12 2017-03-07 Saint-Gobain Isover Internal combustion burner
JP2018522200A (ja) * 2015-07-31 2018-08-09 ヌヴェラ・フュエル・セルズ，エルエルシー ＮＯｘ放出が低減されたバーナーアセンブリ

Also Published As

Publication number Publication date
ES2136955T3 (es) 1999-12-01
FR2741702A1 (fr) 1997-05-30
FR2741702B1 (fr) 1997-12-26
DE69604366T2 (de) 2000-05-11
EP0775868B1 (de) 1999-09-22
DE69604366D1 (de) 1999-10-28
ATE184978T1 (de) 1999-10-15

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