WO2025032142A1 - Bruleur, notamment pour section de prechauffage a flamme directe de ligne continue de traitement d'une bande metallique - Google Patents
Bruleur, notamment pour section de prechauffage a flamme directe de ligne continue de traitement d'une bande metallique Download PDFInfo
- Publication number
- WO2025032142A1 WO2025032142A1 PCT/EP2024/072371 EP2024072371W WO2025032142A1 WO 2025032142 A1 WO2025032142 A1 WO 2025032142A1 EP 2024072371 W EP2024072371 W EP 2024072371W WO 2025032142 A1 WO2025032142 A1 WO 2025032142A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- burner
- combustion chamber
- oxidant
- fuel injection
- internal combustion
- 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.)
- Ceased
Links
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
-
- 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
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/03005—Burners with an internal combustion chamber, e.g. for obtaining an increased heat release, a high speed jet flame or being used for starting the combustion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Definitions
- the invention relates to industrial burners, intended in particular for continuous lines for annealing or galvanizing metal strips, horizontal or vertical, and more particularly to the direct combustion preheating sections of these lines, sometimes called "NOF sections", NOF being the abbreviation for "Non-Oxidizing Furnace", or "DFF section", DFF being the abbreviation for "Direct Firing Furnace”.
- the invention is an improvement of the solution described in the applicant's patent FR3114375, for a burner having combustion modes with flame and without flame.
- the burners In the direct combustion preheating sections of the steel strip processing lines, the burners must be able to operate in reducing mode, i.e. underfed with oxidant, in order to reduce as much as possible the presence of oxygen near the metal strip and thus avoid its oxidation.
- the ignition of the burners when the furnace is at low temperature, for example during its start-up, is generally facilitated by the application of super-stoichiometric conditions, that is to say by overfeeding the burners with oxidant.
- the flue gases flow in the opposite direction to the metal strip, from the outlet of the preheating section to its inlet. This exposes the burners in the zones located at the inlet of the section to the flue gases from the burners in the zones located upstream in the direction of flue gas flow.
- inert gases such as nitrogen are present in the furnace. The burner must therefore be able to ignite and heat up in a highly diluted environment.
- Flameless mode is achieved at high temperatures, for example above 850°C, by recirculating a significant portion of the combustion gases inside the furnace to achieve a homogeneous and distributed reaction zone compared to an intense zone for flame mode combustion.
- the burners operate in flame mode.
- the high recirculation rate and the presence of inert gases such as nitrogen inside the furnace dilute the reaction zone and disturb the flame base.
- the flame may go out.
- Premixing of the oxidant with the fuel downstream of the flame stabilizes the flame but leads to an intense reaction zone near the burner. This results in burner overheating and higher emissions of nitrogen oxides.
- the invention overcomes these problems without requiring a pilot burner.
- Burners subject to the above requirements are usually equipped with a pilot burner used to ensure ignition of the burner under all conditions.
- the pilot burner power is limited, typically 5 to 15 kW, because it often operates in premix mode, and it only serves to ignite the burner and help stabilize the flame during the furnace warm-up procedure.
- Pilot burners are used only until the autoignition temperature of the fuel is reached, after which they are extinguished and sometimes retracted from the burner.
- Pilot burners that remain in place often require cooling when the furnace is in production, at its nominal operating temperature.
- Pilot burners represent additional capital expenditure because they require a fuel and oxidizer circuit separate from the main burner circuits, in addition to a dedicated control unit.
- the zones equipped with pilot burners are used for ignition and warming up, while the other zones are ignited later, one after the other, when their temperature reaches the auto-ignition temperature of the fuel due to the energy provided by the neighbouring zone in operation.
- This operating system is less flexible because most zones depend on their temperature to be in service.
- combustion occurs in an oxidant-deficient environment to prevent oxidation of the metal strip.
- the reaction produces non-oxidized or partially oxidized species such as carbon monoxide and hydrocarbons. They must be further oxidized in the recovery zone of the preheating section or in a dedicated section generally called a post-combustion furnace.
- the last zones, in the gas flow direction are in operation, so that the combustion gases exit at a relatively high temperature, facilitating the oxidation of unburned species in the recovery zone.
- a gaseous fuel burner capable of operating in so-called "flameless" mode, having a longitudinal axis at the intersection of two perpendicular planes, and comprising a diffuser crossed by fuel injection ducts for operation in flameless mode and oxidant injection ducts, said oxidant injection ducts emerging from the diffuser closer to the axis of the burner than said fuel injection ducts for operation in flameless mode, the burner further comprising a central fuel injection duct for operation in flame mode which extends in the axial direction of the burner, characterized in that it comprises a combustion chamber internal to the burner into which the central fuel injection duct at least partially opens as well as at least one passage supplying oxidant, the internal combustion chamber further comprising an ignition electrode capable of starting combustion in the internal combustion chamber at least partially of the mixture of fuel and oxidant supplied therein by the duct central fuel injection system and at least one conduit supplying oxidant.
- the internal combustion chamber creates a volume in which combustion can take place under stable and controlled conditions, independent of the temperature of the oven and its atmosphere.
- an electrode makes it possible to ensure the ignition of this combustion by a simple and inexpensive device. It can also be used to check the presence of a flame by ionization.
- the layout of the internal combustion chamber allows the central fuel injection duct to be used to supply fuel to it.
- the internal combustion chamber forms a tunnel whose inlet diameter is greater than the outlet diameter, depending on the direction of flow of the fluids.
- the internal combustion chamber is a converging tunnel, with a progressive reduction in size to reach a diameter smaller than that of the oxidizer disk.
- the average diameter of the internal combustion chamber depends on the power desired in it. A larger combustion chamber allows for higher power. However, the internal combustion chamber must not disturb the flow of oxidant to the oxidant injection ducts of the diffuser.
- the size of the combustion chamber is also limited by its pressure drop. It must be large enough to limit the amount of oxidant entering the combustion chamber so as to ensure that enough oxidant passes through the oxidant injection ducts of the diffuser. This maintains the aerodynamics of the flameless mode of operation of the burner.
- downstream end of the internal combustion chamber in the direction of flow of the fluids, is located in an axial duct of the diffuser opening into a flame tunnel.
- the axial duct to the burner allows the downstream end of the combustion chamber to be mechanically held. It also allows the outlet diameter of the combustion chamber to be substantially maintained over an additional length, that of the axial duct which is located beyond the internal combustion chamber. This additional length contributes to the holding of the flame coming from the internal combustion chamber.
- the central fuel injection duct comprises fuel injection passages arranged at two levels along the duct.
- the first level of radially injected fuel is intended to mix with oxidant to form the base of the flame in the internal combustion chamber.
- the second level of fuel injected later is mainly intended to mix with oxidant brought out of the internal combustion chamber by the oxidant injection ducts of the diffuser. It aims to give the flame a good boost to protect it from the diluting environment.
- the central fuel injection conduit comprises fuel injection passages which open into the combustion chamber internal to the burner.
- This arrangement makes it possible to simply supply the fuel necessary to achieve combustion in the internal combustion chamber.
- the fuel injection passages can be axial and/or radial and/or inclined at an angle of between 0 and 90°% relative to the axis of the burner.
- the arrangement of the fuel injection passages is chosen according to the nature of the gaseous fuel, in particular its calorific value, so that the flow of fuel into the internal combustion chamber leads to a stable flame of sufficient intensity.
- the central fuel injection conduit comprises at least one fuel injection passage which opens downstream of the internal combustion chamber to the burner, in the direction of flow of the fluids.
- the supply of fuel downstream of the chamber limits the power released in it. This has the effect of limiting the temperature of the walls of the internal combustion chamber and thus increasing its durability over time.
- the burner comprises an oxidizer disk linked to the central fuel injection conduit, the disk forming an annular passage with the internal combustion chamber in which oxidizer can circulate.
- the injection of oxidant into the combustion chamber is carried out in such a way as to confine the flame away from the wall of the internal combustion chamber.
- the peripheral flow of oxidant makes it possible to cool the internal combustion chamber and confine the reaction zone.
- the oxidant disk comprises passages through which oxidant can circulate.
- passages allow the oxidant to be optimally distributed in the internal combustion chamber. They are arranged axisymmetrically around the central fuel injection duct.
- passages of the oxidizer disk form grooves having a radial component and a tangential component to generate a swirling flow of the oxidizer downstream of the oxidizer disk.
- the swirling flow resulting from the grooves promotes the mixing of the oxidizer and the fuel.
- the oxidizer disk comprises circular openings adjoining the ends of the proximal grooves of the burner axis.
- the oxidizer disk comprises cylindrical passages converging towards the axis of the burner, in the direction of flow of the oxidizer.
- the injection angle is determined to form a stable flame base.
- the combustion chamber internal to the burner has a silicon carbide wall.
- silicon carbide allows very good resistance over time of the internal combustion chamber. It also allows more intense combustion in the combustion chamber due to the higher temperature resistance of silicon carbide compared to that of refractory steels.
- FIG. 1 is a schematic front view of the diffuser of a burner according to the state of the art
- FIG. 1 is a schematic enlargement and longitudinal section of an internal part of a burner according to a first exemplary embodiment of the invention
- FIG. 1 is a schematic front view of the injector of the central fuel injection duct and the oxidizer disk for a fifth exemplary embodiment of the invention.
- variants of the invention comprising only a selection of the features described, subsequently isolated from the other features described, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art.
- This selection comprises at least one feature, preferably functional without structural details, or with only a part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art.
- FIG. 1 there is partially and schematically shown a burner 1 according to the state of the art, as described in the applicant's patent FR3114375, seen from the front, and oriented according to a vertical plane P1 and a horizontal plane P2.
- This figure illustrates the orientation of the burner when it is positioned in a vertical preheating section of a continuous line, with a strip circulating vertically.
- the fuel passes through two converging conduits 3, arranged on the plane P1.
- the oxidant passes through four conduits 4, 5, the conduits 4 arranged on the plane P1 being divergent and the conduits 5 arranged on the plane P2 being convergent.
- the burner also includes a central fuel injection duct 6 for operation of the burner at a lower temperature, in flame mode.
- An annular passage around this duct 6 allows an oxidant supply.
- the oxidant conduits 4, 5 open into a combustion tunnel 13 for better flame retention.
- the combustion chamber is substantially cylindrical, with a longitudinal axis coincident with axis A of the burner.
- the internal combustion chamber comprises a first segment 15 of larger diameter connected by a second conical segment 16 to a third segment 17 of smaller diameter than that of the first segment.
- the third segment 17 is located in an axial conduit 12 connecting to a flame tunnel 13.
- the chamber is held in position by the connecting conduit 12 as well as support and guide means not shown.
- the upstream face 18 of the internal combustion combustion chamber 7 comprises passages 8 allowing oxidant to enter the chamber.
- passages can be distributed on the upstream face 18, being more or less distant from the axis A of the burner.
- a clearance between the upstream face 18 and the central fuel injection conduit 6 can form a passage.
- the central fuel injection duct 6 comprises radial passages 19 for injecting fuel into the internal combustion chamber, for example here four cylindrical holes.
- An ignition electrode 9 generates an electric arc when energized to initiate combustion in chamber 7.
- the flame which starts in the internal chamber thus extends outside of it, into conduit 12, into tunnel 13 and then into the oven.
- the downstream end of the central fuel injection conduit 6 also comprises an axial passage 20 arranged substantially at the entrance to the flame tunnel 13.
- the supply of fuel via the axial passage 20 makes it possible to obtain a very stable flame of sufficient power to prevent any extinction of the main flame.
- 60% of the fuel flow supplied by the central fuel injection conduit 6 passes through the radial passages 19 and 40% through the axial passage 20 and the oxidant flow passing through the passages 8 makes it possible to obtain a mixture with this fuel flow having 5% excess air compared to stoichiometric combustion.
- the central fuel injection duct 6 extends into the flame tunnel 13.
- the axial passage is replaced by new radial passages 22 arranged at the downstream end of the duct.
- This arrangement of the passages 22 allows a more intense mixing of the fuel arriving from the passages 22 with the oxidant arriving via the conduits 4 and 5.
- the main flame present in the tunnel 13 is thus more lively, leading to a shorter and more intense flame, compared to that obtained with an arrangement according to the first example of embodiment of the .
- a third example of realization is represented schematically in .
- the internal combustion chamber 7 is open at its upstream end 23 in the direction of flow of the oxidant.
- the central fuel injection conduit 6 comprises an injector 33 comprising a set of eight passages 24 having a radial component and an axial passage 25, all of these passages opening into the internal combustion chamber 7.
- the passages 24 are inclined at an angle of 75° relative to the axis A of the burner and the section of the axial passage 25 is here 10% of the total section of the passages 24.
- the injector 33 carries a disk 26 of oxidant arranged in the internal combustion chamber 7. It forms an annular passage 27 with the internal combustion chamber in which oxidant can circulate.
- the mixture obtained in the internal combustion chamber of the oxidant and the fuel supplied by the passages 24, 25 and 27 allows an ignition of the latter by the electrode 9.
- the inclination of the fuel passages 24 promotes a rapid mixing with the oxidant in the internal combustion chamber, advantageous for the reliability of the ignition of the internal combustion and the maintenance of the latter.
- the axial passage 25 allows an elongation of the flame favorable to the main combustion, in the tunnel 13 and in the furnace.
- a fourth example of realization is represented schematically in , close to that of the . It is distinguished from the latter by a larger diameter oxidizer disc 26, hence the absence of any notable flow on the outside of the oxidizer disc.
- the profile of the internal combustion chamber 7 is also slightly different.
- the oxidizer disc has passages 28 for the entry of the oxidizer into the internal combustion chamber, conducive to good ignition and good flame retention.
- a fifth example of realization is represented in . Only the central fuel injection conduit 6 and the oxidizer disk 26 are shown in front view and in section at the level of radial fuel passages 19.
- the oxidizer disk 26 comprises four circular passages 32 for supplying oxidizer into the internal combustion chamber 7 of the burner. These passages are inclined and they converge towards the axis A of the burner. They are arranged opposite passages 19 for injecting fuel into the internal combustion chamber 7.
- the passage 34 is intended to receive the ignition electrode 9.
- the innovation lies in the procedure for igniting and heating the burner using a central fuel injector ignited by an electrode instead of a pilot burner.
- the gas injector design is a coaxial burner with an output that can be more than half of the total output of the main burner.
- the fuel injector design is not limited to a coaxial configuration.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Pre-Mixing And Non-Premixing Gas Burner (AREA)
Abstract
Description
Claims (11)
- Brûleur (1) à combustible gazeux apte à fonctionner en mode dit « sans flamme », présentant un axe (A) longitudinal à l’intersection de deux plans perpendiculaires (P1, P2), et comprenant un diffuseur (2) traversé par des conduits d’injection de combustible (3) pour un fonctionnement en mode sans flamme et des conduits d’injection de comburant (4, 5), lesdits conduits d’injection de comburant (4, 5) débouchant du diffuseur plus près de l’axe du brûleur que lesdits conduits d’injection de combustible (3) pour un fonctionnement en mode sans flamme, le brûleur comprenant en outre un conduit (6) central d’injection de combustible pour un fonctionnement en mode flamme qui s’étend selon la direction axiale (A) du brûleur, caractérisé en ce qu’il comprend une chambre (7) de combustion interne au brûleur dans laquelle débouche au moins partiellement le conduit (6) central d’injection de combustible ainsi qu’au moins un passage (8, 27, 28) apportant du comburant, la chambre de combustion interne comprenant en outre une électrode (9) d’allumage apte à démarrer une combustion dans la chambre (7) de combustion interne au moins partielle du mélange de combustible et de comburant apporté dans celle-ci par le conduit (6) central d’injection de combustible et le au moins un conduit (8, 27, 28) apportant du comburant.
- Brûleur selon la revendication 1, caractérisé en ce que la chambre (7) de combustion interne forme un tunnel (10) dont le diamètre d’entrée est supérieur au diamètre de sortie, selon le sens d’écoulement des fluides.
- Brûleur selon l’une des revendications précédentes, caractérisé en ce que l’extrémité (17) aval de la chambre (7) de combustion interne, dans le sens d’écoulement des fluides, est située placée dans un conduit (12) axial du diffuseur débouchant dans un tunnel (13) de flamme.
- Brûleur selon la revendication 1, caractérisé en ce que le conduit (6) central d’injection de combustible comprend des passages (19) d’injection de combustible disposés à deux niveaux le long du conduit.
- Brûleur selon la revendication 4, caractérisé en ce que le conduit (6) central d’injection de combustible comprend des passages (19) d’injection de combustible qui débouchent dans la chambre (7) de combustion interne au brûleur.
- Brûleur selon la revendication précédente, caractérisé en ce que les passages (19) d’injection de combustible peuvent être axiaux et/ou radiaux et/ou inclinés selon un angle compris entre 0 et 90° par rapport à l’axe (A) du brûleur.
- Brûleur selon l’une des revendications 5 ou 6, caractérisé en ce que le conduit (6) central d’injection de combustible comprend au moins un passage (20, 21) d’injection de combustible qui débouche en aval de la chambre (7) de combustion interne au brûleur, dans le sens d’écoulement des fluides.
- Brûleur selon l’une des revendications précédentes, caractérisé en ce qu’il comprend un disque (26) de comburant lié au conduit (6) central d’injection de combustible, le disque formant un passage (27) annulaire avec la chambre interne de combustion dans lequel peut circuler du comburant.
- Brûleur selon la revendication précédente, caractérisé en ce que le disque (26) de comburant comprend des passages (28) par lesquels du comburant peut circuler.
- Brûleur selon la revendication 9, caractérisé en ce que le disque (26) de comburant comprend des passages (32) de forme cylindrique convergents vers l’axe (A) du brûleur, dans le sens d’écoulement du comburant.
- Brûleur selon l’une des revendications précédentes, caractérisé en ce que la chambre (7) de combustion interne au brûleur a une paroi (31) en carbure de silicium.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020267006681A KR20260048610A (ko) | 2023-08-09 | 2024-08-07 | 특히 연속 금속-스트립 처리 라인의 직접-화염 예열 섹션을 위한 버너 |
| EP24755210.2A EP4758371A1 (fr) | 2023-08-09 | 2024-08-07 | Bruleur, notamment pour section de prechauffage a flamme directe de ligne continue de traitement d'une bande metallique |
| CN202480052266.2A CN121752845A (zh) | 2023-08-09 | 2024-08-07 | 特别地用于连续金属带处理线的直焰预热段的燃烧器 |
| MX2026001512A MX2026001512A (es) | 2023-08-09 | 2026-02-06 | Quemador, especialmente para seccion de precalentamiento de llama directa de linea continua de tratamiento de tiras metalicas |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2308601 | 2023-08-09 | ||
| FRFR2308601 | 2023-08-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2025032142A1 true WO2025032142A1 (fr) | 2025-02-13 |
Family
ID=89426640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2024/072371 Ceased WO2025032142A1 (fr) | 2023-08-09 | 2024-08-07 | Bruleur, notamment pour section de prechauffage a flamme directe de ligne continue de traitement d'une bande metallique |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4758371A1 (fr) |
| KR (1) | KR20260048610A (fr) |
| CN (1) | CN121752845A (fr) |
| MX (1) | MX2026001512A (fr) |
| WO (1) | WO2025032142A1 (fr) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5149261A (en) * | 1985-11-15 | 1992-09-22 | Nippon Sanso Kabushiki Kaisha | Oxygen heater and oxygen lance using oxygen heater |
| EP0965649A1 (fr) * | 1998-06-17 | 1999-12-22 | Praxair Technology, Inc. | Jet de gaz supersonique pour le transfert de gaz dans un liquide |
| WO2010150228A2 (fr) * | 2009-06-26 | 2010-12-29 | Ergo Design S.R.L. | Brûleur |
| FR3114375A1 (fr) | 2020-09-23 | 2022-03-25 | Fives Stein | Bruleur, notamment pour section de prechauffage a flamme directe de ligne continue de traitement d’une bande metallique |
-
2024
- 2024-08-07 WO PCT/EP2024/072371 patent/WO2025032142A1/fr not_active Ceased
- 2024-08-07 EP EP24755210.2A patent/EP4758371A1/fr active Pending
- 2024-08-07 KR KR1020267006681A patent/KR20260048610A/ko active Pending
- 2024-08-07 CN CN202480052266.2A patent/CN121752845A/zh active Pending
-
2026
- 2026-02-06 MX MX2026001512A patent/MX2026001512A/es unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5149261A (en) * | 1985-11-15 | 1992-09-22 | Nippon Sanso Kabushiki Kaisha | Oxygen heater and oxygen lance using oxygen heater |
| EP0965649A1 (fr) * | 1998-06-17 | 1999-12-22 | Praxair Technology, Inc. | Jet de gaz supersonique pour le transfert de gaz dans un liquide |
| WO2010150228A2 (fr) * | 2009-06-26 | 2010-12-29 | Ergo Design S.R.L. | Brûleur |
| FR3114375A1 (fr) | 2020-09-23 | 2022-03-25 | Fives Stein | Bruleur, notamment pour section de prechauffage a flamme directe de ligne continue de traitement d’une bande metallique |
Also Published As
| Publication number | Publication date |
|---|---|
| CN121752845A (zh) | 2026-03-27 |
| MX2026001512A (es) | 2026-03-02 |
| KR20260048610A (ko) | 2026-04-10 |
| EP4758371A1 (fr) | 2026-06-17 |
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