EP0775868B1 - Gasbrenner für Aufwärmöfen für siderurgische Produkte - Google Patents

Gasbrenner für Aufwärmöfen für siderurgische Produkte Download PDF

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Publication number
EP0775868B1
EP0775868B1 EP96402273A EP96402273A EP0775868B1 EP 0775868 B1 EP0775868 B1 EP 0775868B1 EP 96402273 A EP96402273 A EP 96402273A EP 96402273 A EP96402273 A EP 96402273A EP 0775868 B1 EP0775868 B1 EP 0775868B1
Authority
EP
European Patent Office
Prior art keywords
burner
gas
furnace
air
orifices
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
EP96402273A
Other languages
English (en)
French (fr)
Other versions
EP0775868A1 (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
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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
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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 slabs for example.
  • These burners are high power burners, supplied with particularly in steel gas (mixed gas, coke oven gas for example), and are arranged in the roof of the heating furnaces.
  • burners of this kind which generally have several concentric channels fuel gas and air supply, opening at the nose of the burner, downstream of which combustion occurs.
  • burners of the type "jet burner” very high gas ejection speed, greater than 100 meters per second.
  • the air and the combustion gas burn in the combustion chamber combustion of the burner, and at the burner outlet, we are in the presence of hot smoke, combustion is complete.
  • This type of burner is commonly used in ovens requiring direct heating of products, for example in hoods caking agglomeration, because the very high gas ejection speed allows to heat a very localized area.
  • Such a type of burner is not suitable for furnaces reheating of steel products because the heating they provide is very localized direct heating. Their use would cause temperature heterogeneity on the product to be heated with risk important appearance of black streaks and risk of causing problems during the subsequent rolling operation (in the case of reheating the slabs).
  • the flame due to the combustion of the air / gas mixture is generated downstream of the burner nose, in the burner, i.e. in the housing fitted into the internal lining of the oven and into which the burner.
  • This tulip-shaped workpiece allows you to tackle the flame against the walls of said opener and against the walls of the roof of the oven.
  • the weak gas impulse in this type of burner leads to poor mixing of the fumes inside the oven and thus heterogeneity of temperatures between the oven roof and the product steel 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. he is only intended to operate on steel gas and cannot be suitable for running on natural gas.
  • This type of burner requires a tulip-shaped burner, it is relatively expensive to operate due to the high cost of this type of workman. In addition, this type of workman is relatively fragile.
  • this type of burner has a low efficiency thermal, in the sense of its capacity to generate a rise in temperature 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, into the burner, in the form of a ball.
  • a big disadvantage of this type of burner is its very low adjustment latitude in terms of heating power.
  • 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 circle around the gas passage openings, generating a short flame, with a length of the order of 2 meters, and a third series of orifices for the air passage, located at the periphery, generating a long flame, of a length of the order of 4.5 meters.
  • This type of burner is a burner for direct heating of steel products. There is therefore a drawback related to this function, to know the heterogeneity of temperatures in the product to be heated, certainly less important than in the case of "jet burners".
  • the object of the present invention is to propose a burner combining direct heating and indirect heating by radiation of the roof of the furnace, having a great latitude of adjustment of the power of heats, allowing to generate a homogeneous temperature of the roof of the furnace, which can use both steel and natural gas, while not producing too much nitrogen oxide.
  • the present invention also relates to an oven roof of reheating of steel products, characterized in that it comprises at least one housing 9, cylindrical with diameter D3, arranged in the internal lining of the oven roof, in which a burner is kept 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 housing fitted in the internal lining of the oven roof and the distance between the front surface of the burner nose and the top of the oven is between 0.9 and 1, preferably equal to 0.95.
  • the burner 1 includes a gas supply box 2 fuel and air, formed of a central gas supply channel 3, oriented in the axial direction X of the burner, surrounded by an annular channel 4 air intake.
  • the burner 1 also includes a nose 7 also called 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 sealing between them, and which is inserted into a housing 9, cylindrical with diameter D3, fitted into the internal lining of the oven roof, being there held by fixing means, not shown, on the wall of the oven.
  • the upstream face of the burner nose 7 has a surface frontal 13 flat, facing the interior of the oven.
  • the plate 8 of the burner nose 7 is traversed by a plurality gas and air outlet ports.
  • the orifices 10, connected to the gas supply channel 3 are coaxial to 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 channel 4 air supply are made so that the axis of each orifice either located 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 escaping air flow has a rotational movement around the X axis of the burner, creating a swirling air flow causing depression which sucks in 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 burner nose 7 has a portion 14 recessed towards the interior of the burner with respect to the substantially planar front surface 13, perpendicular to the X axis of the burner, into which the orifices 10 open gas passage and the air passage orifices 12, the recessed part 14 and the front surface 13 being interconnected by a connecting surface 15.
  • the connecting surface 15 between the front surface 13 and the part set back 14 from the upstream face of the burner nose is substantially in the form of truncated cone, the large base of which is located at the level of the frontal surface 13.
  • the angle ⁇ of the truncated cone of the connecting surface 15 is between 20 and 40 °, preferably equal to 30 °.
  • the D1 / D2 ratio of crowns C1 and C2, respectively of the series of orifices 10 of gas passage and the series of air passage holes is included between 0.4 and 0.5.
  • this ratio D1 / D2 is less than 0.4, the flame is of the type "jet", impacting directly on the product, and when using gas natural, there is separation of the flame and risk of extinction. If this report is greater than 0.5, the flame is very short, disturbed, and there is overheating of the workman, especially if you use natural gas.
  • the ratio between the diameter D2 of the crown C2 of the series of air passage holes 12 and the diameter D3 of the housing 9 fitted in the internal lining of the oven roof is between 0.6 and 0.8.
  • this ratio D2 / D3 is less than 0.6, a flame is produced soft, poorly directed, sensitive to variations in the internal pressure of the oven. If this ratio is greater than 0.8, the flame is an airplane nozzle type torch, it there is a strong separation of the flame if natural gas is used, and at high flow the flame is blown out for all types of gas.
  • the relationship between the diameter D3 of the fitted housing 9 in the internal lining of the oven roof and the distance H between the front surface 13 of the burner nose and the top of the oven is between 0.9 and 1.
  • 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 oven roof, but develops at the interior of 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 vault of the oven.
  • a ratio of diameters D1 / D2 equal to 0.40 or equal to 0.50 ensures that the burner will effectively combine the function direct heating and indirect heating by radiation of the oven roof.
  • a D1 / D2 ratio of 0.43 is very close to ideal if a steel gas is used, but is not completely satisfactory if you use natural gas.
  • a D1 / D2 ratio of 0.48 is very close to ideal for natural gas, but causes flames if using a gas mixed at high flow and produces too much NOx.
  • the relationship 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 at from a gas ejection speed equal to 40 meters per second.
  • Such a burner can thus operate with an ejection speed gases from 40 to 100 meters per second, which gives it great latitude to adjust the heating power, while ensuring homogeneous arch 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)

Claims (7)

  1. Gasbrenner, insbesondere für Aufwärmöfen für siderurgische Produkte, mit einer mittigen Zufuhrleitung (3) für ein Brenngas, mit einer ringförmigen konzentrischen Zufuhrleitung (4) für Luft und mit einem Brennerkopf (7), wobei der Brennerkopf (7) eine dem Inneren des Ofens gegenüberliegende Vorderseite (13) aufweist, sowie:
    eine erste Reihe von Öffnungen (10) für den Gasdurchlaß, die kreisförmig entlang eines Ringes (C1) mit einem mittleren Durchmesser (D1) angeordnet sind und die mit der mittigen Leitung (3) in Verbindung stehen,
    eine zweite Reihe von Öffnungen (12) für den Luftdurchlaß, die kreisförmig entlang eines Ringes (C2) mit einem mittleren Durchmesser (D2) um die Öffnungen (10) für den Gasdurchlaß herum angeordnet sind und die mit der ringförmigen Zufuhrleitung (4) für Luft in Verbindung stehen, wobei die Öffnungen (12) für den Luftdurchlaß schraubenlinienförmig ausgerichtet sind, um einen wirbelförmigen Luftstrom zu erzeugen, der einen das Gas ansaugenden Unterdruck erzeugt, dadurch gekennzeichnet, dass
    die Öffnungen (10) für den Gasdurchlaß koaxial sind zur Axialrichtung des Brennerkopfes und dass das Verhältnis der Durchmesser D1/D2 die Ringe (C1 und C2) zwischen 0,4 und 0,5 liegt.
  2. Gasbrenner nach Anspruch 1, dadurch gekennzeichnet, dass der Brennkopf (7) einen bezüglich der Vorderseite (13) des Kopfes zum Inneren des Brenners hin zurückspringenden im wesentlichen ebenen Abschnitt (14) aufweist, der senkrecht zur Brennerachse verläuft und in dem die beiden Reihen von Öffnungen münden, wobei der zurückspringende Abschnitt (14) und die Vorderseite (13) über eine Verbindungsfläche (15) miteinander verbunden sind.
  3. Gasbrenner nach Anspruch 2, dadurch gekennzeichnet, dass die Verbindungsfläche (15) zwischen der Vorderseite (13) und dem zurückspringenden Abschnitt (14) der vorderen Fläche des Brennerkopfes im wesentlichen Kegelstumpfform aufweist, wobei die große Grundfläche auf Höhe der Vorderseite (13) angeordnet ist.
  4. Gasbrenner nach Anspruch 3, dadurch gekennzeichnet, dass der Winkel β des Kegelstumpfes des zurückspringenden Abschnitts zwischen 20 und 40° liegt und vorzugsweise 30° beträgt.
  5. Gasbrenner nach Anspruch 1, dadurch gekennzeichnet, dass das Verhältnis der Durchmesser D1/D2 der Ringe (C1 und C2) gleich 0,46 ist.
  6. Gewölbe für einen Aufwärmofen für siderurgische Produkte, dadurch gekennzeichnet, dass es wenigstens eine zylindrische Aussparung (9) mit einem Durchmesser D3 aufweist, die in der inneren Auskleidung des Gewölbes des Ofens ausgebildet ist und in der ein Brenner nach den vorhergehenden Ansprüchen eingesetzt ist und dass das Verhältnis des Durchmessers D2 des Ringes mit den Öffnungen für den Luftdurchlaß des Brenners zum Durchmesser D3 der Aussparung (9) zwischen 0,6 und 0,8 liegt und vorzugsweise gleich 0,68 ist.
  7. Gewölbe für einen Aufwärmofen für siderurgische Produkte nach Anspruch 6, dadurch gekennzeichnet, dass das Verhältnis des Durchmesser D3 der Aussparung (9) zum Abstand H der Vorderseite des Brennerkopfes vom Gewölbe des Ofens zwischen 0,9 und 1 liegt und vorzugsweise gleich 0,95 ist.
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 EP0775868A1 (de) 1997-05-28
EP0775868B1 true 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)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2316161A (en) * 1996-08-05 1998-02-18 Boc Group Plc Oxygen-fuel swirl burner
ES2159217B1 (es) * 1998-05-14 2002-04-01 Adiego Tomas Adiego Dispositivo para evitar perdidas termicas de la corona de llamas de un quemador.
ITMI20020611A1 (it) 2002-03-22 2003-09-22 Danieli Off Mecc Bruciatore
US7549858B2 (en) * 2006-12-04 2009-06-23 Praxair Technology, Inc. Combustion with variable oxidant low NOx burner
FR2914986B1 (fr) * 2007-04-12 2015-04-10 Saint Gobain Isover Bruleur a combustion interne
DE102008011567B4 (de) * 2008-02-28 2010-01-28 Corall, Paul, Dipl.-Ing. Prüfeinrichtung zur Überprüfung der Funktionsfähigkeit von Rauchabzugsanlagen
WO2017023530A1 (en) * 2015-07-31 2017-02-09 Nuvera Fuel Cells, LLC Burner assembly with low nox emissions

Family Cites Families (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
FR2671605A1 (fr) * 1991-01-16 1992-07-17 Lorraine Laminage Melangeur d'air et de gaz de combustion pour bruleur a gaz de fours industriels.
FR2717884B1 (fr) * 1994-03-24 1996-06-07 Lorraine Laminage Brûleur à gaz pour fours industriels.

Also Published As

Publication number Publication date
FR2741702B1 (fr) 1997-12-26
DE69604366D1 (de) 1999-10-28
DE69604366T2 (de) 2000-05-11
ATE184978T1 (de) 1999-10-15
EP0775868A1 (de) 1997-05-28
ES2136955T3 (es) 1999-12-01
FR2741702A1 (fr) 1997-05-30

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