EP2044366A1 - Brûleur à flamme et procédé de brûlage au chalumeau d'une surface métallique - Google Patents

Brûleur à flamme et procédé de brûlage au chalumeau d'une surface métallique

Info

Publication number
EP2044366A1
EP2044366A1 EP07722449A EP07722449A EP2044366A1 EP 2044366 A1 EP2044366 A1 EP 2044366A1 EP 07722449 A EP07722449 A EP 07722449A EP 07722449 A EP07722449 A EP 07722449A EP 2044366 A1 EP2044366 A1 EP 2044366A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
oxygen
flammbrenner
central
region
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.)
Withdrawn
Application number
EP07722449A
Other languages
German (de)
English (en)
Inventor
Egon Evertz
Ralf Evertz
Stefan Evertz
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.)
Egon Evertz KG GmbH and Co
Original Assignee
Egon Evertz KG GmbH and Co
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 Egon Evertz KG GmbH and Co filed Critical Egon Evertz KG GmbH and Co
Publication of EP2044366A1 publication Critical patent/EP2044366A1/fr
Withdrawn legal-status Critical Current

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
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/38—Torches, e.g. for brazing or heating
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/56—Nozzles for spreading the flame over an area, e.g. for desurfacing of solid material, for surface hardening, or for heating workpieces
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00012—Liquid or gas fuel burners with flames spread over a flat surface, either premix or non-premix type, e.g. "Flächenbrenner"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14642—Special features of gas burners with jet mixers with more than one gas injection nozzles or orifices for a single mixing tube
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a Flammbrenner with a nozzle arranged in a head, which has a central gas supply opening in addition to annularly arranged gas supply channels.
  • the invention further relates to a method for flame blending a metallic surface by means of said flame burner.
  • the fuel gas is conducted via the ring-shaped gas supply channels to a nozzle head, where it is mixed with the oxygen transported via the central gas supply and forms the combustion flame.
  • Flame burner are used for different applications.
  • undesired cracks frequently occur which must be removed by a surface treatment.
  • burrs or beards which occur during processing of the slabs, z. B. caused by cutting.
  • the Flammbrenner be performed to eliminate the surface defects along the affected areas, which can be done with a manually guided burner or a scarfing machine in which on a controllable robotic arm a Flammbrenner is attached.
  • the processing costs for the surface treatment are essentially determined by the processing time and the gas consumption, whereby a sufficient surface quality must be ensured.
  • the flame burner described in claim 1 further proposed the method described in claim 9.
  • the flame burner according to the invention has a nozzle with a plurality of gas supply channels, which are arranged in a ring around a central gas supply opening.
  • the central oxygen supply opening has in the direction of flow at least three successive areas, namely a first to a minimum inner diameter tapered region, a second region in which the inner sheath extends to a larger diameter relative to said minimum diameter and a third area with constant cross-sectional profile, preferably constant cylindrical inner diameter.
  • Essential is the cross-sectional constriction of the inner diameter up to a critical dimension of the diameter, which is followed by a diameter extension.
  • the last third area with constant cross-sectional profile serves as a stabilizing ring to obtain the generated gas flow profile.
  • a pulsating gas jet can be generated, which has a speed of sound or supersonic speed at the nozzle exit end.
  • the ratio between the oxygen pressure before the nozzle and the ambient pressure on the one hand and the ratio of the oxygen pressure at the nozzle exit surface and the ambient pressure determine the profile of the gas. If the pressure at the nozzle exit surface is below the ambient pressure, then the exiting gas jet has a narrowing shape in the initial section behind the nozzle, whereas with an inverse relationship the shape is barrel-shaped widening. If the oxygen pressure upstream of the nozzle and at the outlet from the nozzle are each equal to the ambient pressure, the result is a straight-line envelope of the initial section of the outflowing gas.
  • the pulse rate achievable with the nozzle as well as the amplitude depends in detail on the inlet pressure, the degree of rejuvenation and the degree of dilation.
  • the generated non-isobaric turbulent supersonic jet is characteristic is characterized by strong spatial imbalances of the velocity and pressure fields which lead to the generation of unsteady state changes, namely the pulsed compression collisions and layer shifts with large velocity gradients. This flow velocity and pressure pulsation lead to a Pulsationsssprektrum. From a certain value, the gas velocity in the nozzle described locally reaches the speed of sound in the critical smallest nozzle cross section, above which pulsed compressed and thinned regions occur as impulses.
  • This type of shock wave can form a barrel-shaped flow structure, the strung densities of which depend on the ratio of the oxygen pressure in the nozzle to the ambient pressure and the so-called Mach number, which is the ratio of the velocity of the gas at the nozzle exit surface to the speed of sound.
  • the Flammbrenner has a nozzle which is designed in the manner of a Laval nozzle, which forms a vibration resonator with the third region as a "stabilizing ring".
  • first and the second region follow one another directly, but short sections may be included in which the minimum diameter does not change. The flow rate is maintained on this short section.
  • the central gas supply port also terminates slightly in front of the plane defined by the openings in which the annular gas supply channels terminate.
  • solutions are likewise included, in which a plurality of rings of gas supply channels are arranged coaxially, which end in different planes behind the outlet opening of the central tube.
  • the length of the first region is preferably smaller than the length of the second region, and preferably also smaller than the length of the third region.
  • the third region can be chosen to be longer, the same size or even shorter than the total length of the first and second regions.
  • the diameter of the third region is smaller than the maximum output diameter of the central gas supply opening at the beginning of the first region.
  • the diameters and the lengths of the three regions mentioned are adjusted so that the gas exits in a pulsed manner at the nozzle exit end, preferably at a pulse frequency which is between 100 and 650 Hz.
  • a maximum gas flow velocity of 2 Mach should preferably be present at predetermined values of the oxygen and fuel gas pressure.
  • the nozzle may be round or concentric in cross-section, wherein in particular the central gas supply opening has a circular cross section around which at least one ring, possibly two rings extend, are on the further gas supply openings for the fuel gas.
  • the nozzle head is preferably cooled, with water being the preferred cooling fluid.
  • the inventive method for Brennflämmen a metallic surface for. B. a slab, is characterized in that the guided through a central nozzle of a Flammbrenners oxygen is excited to vibrate, that forms a nozzle mouth leaving pulsating oxygen flow at sonic or supersonic speed.
  • the pulsating oxygen flow consists of longitudinal waves, ie a periodic succession of pressure compressions and pressure dilutions of the oxygen gas.
  • the process parameters in particular the oxygen feed pressure with which the oxygen stream is introduced into the nozzle, are selected as a function of the nozzle geometry such that the oxygen gas stream is divided into a central stream and peripheral streams.
  • Fig. 1 is a combined side view and a longitudinal section through the
  • Fig. 2 is a plan view of the nozzle
  • Fig. 3a-d respectively cross-sections through the central gas supply opening with different Gastrom forms.
  • the core of the scarfing burner according to FIGS. 1 and 2 is a nozzle 10 which is arranged in a head and has, in addition to annularly arranged gas supply channels 11, a central gas feed opening 12.
  • the gas inlet openings 111 and 112 each lie on rings which extend concentrically around the gas supply opening 12.
  • the angular distance a is determined by the number n to 360 / n.
  • gas supply channels 111 and 112 lead to an annular gas supply channel 11, as shown in FIG. 1 can be seen.
  • the channels 112, 111 and 11 carry a fuel gas or a mixture of oxygen and a fuel gas, whereas the central gas supply channel 12 is provided for the transport of oxygen.
  • the central gas supply opening 12 is divided into a plurality of areas Li, L 2 , L 4 , L 3 and LK or Li, L c and LK, of which the latter areas are of particular importance.
  • the gas inlet area Li corresponds to the inlet area which is used in nozzles known from the prior art.
  • a novelty is a laval-nozzle-like shape of the central Warzuschreibkanals 12, which extends over the length L c . This nozzle shape is determined through a region in which the nozzle inner diameter is kept to a minimum critical diameter d m j n , which is maintained over a length L 4 (see also Fig. 3).
  • the inner jacket of the gas feed opening 12 widens continuously up to a larger diameter d 1 (see FIG. 3) which remains maintained over the remaining length L k until the end of the nozzle.
  • d 1 diameter
  • Fig. 3 are drawn only cross-sectional views of the central gas supply opening in the Laval-nozzle-like equipped area and in the stabilization area.
  • the oxygen gas flowing into the lavelike region has a pressure Po and a temperature TQ.
  • the pressure is PA.
  • the first region in which the nozzle tapers conically is denoted by 121, the adjoining region of the conical nozzle extension by 122, whereas finally the region of constant diameter bears the reference numeral 123 and shows an image according to FIG. Fig. A to D show depending on the input pressure po different gas pulsations appear as longitudinal waves in which alternate higher and lower pressures.
  • the central oxygen gas flow which is surrounded by a peripheral fuel gas flow, is narrowed or narrowed further.
  • the length LK is decisive for the degree to which the pulsating oxygen flow can be stabilized.
  • the flame burner according to the invention can be designed both as a hand-held device and as a flame-cutting machine.
  • the pressures used, under which the oxygen gas is passed into the central opening, are between 5 and 20 bar.
  • the natural gas used as fuel gas, consisting essentially of methane, is fed under a pressure of 1 to 5 bar.
  • Methane is added via the nozzle inlet 111, which is in communication with the oxygen added via the nozzle inlet 112 mixed, so that peripherally via the ring opening 11, an oxygen-methane mixture flows to the nozzle exit end.
  • the speed aimed for at the stated charging pressure of the oxygen flow in the central duct 112 should be in the supersonic range and should be up to 2 Mach for given plants of the oxygen and fuel gas pressure.
  • a first flame burner was used with a conventional, known in the prior art nozzle for flaming a slab.
  • Oxygen was introduced via the central nozzle under a pressure of approximately 12 ⁇ 10 5 Pa and via the peripherally arranged nozzles fuel gas under a pressure of 2 ⁇ 10 5 Pa.
  • the amount of oxygen consumed during scouring work was between 370 and 390 m 3 .
  • the nozzle according to the invention only 90 to 100 m 3 were required for the same scouring work, which illustrates that an enormous oxygen gas saving can be achieved.

Landscapes

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

Abstract

L'invention concerne un brûleur à flamme avec une buse (10) disposée dans une tête, laquelle présente outre des canaux d'alimentation de gaz (11) disposés de façon annulaire, un orifice d'alimentation de gaz central (12) qui présente une zone de type tuyère de Laval et une zone de stabilisation s'y raccordant dans le sens d'écoulement, le diamètre restant identique. Pour le brûlage au chalumeau d'une surface métallique, l'oxygène guidé au travers d'une buse centrale d'un brûleur à flamme est poussé à osciller de telle sorte qu'un flux d'oxygène pulsé quittant le bec de buse se constitue à la vitesse du son ou de l'ultrason.
EP07722449A 2006-07-22 2007-05-18 Brûleur à flamme et procédé de brûlage au chalumeau d'une surface métallique Withdrawn EP2044366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006034014A DE102006034014A1 (de) 2006-02-23 2006-07-22 Flämmbrenner und Verfahren zum Brennflämmen einer metallischen Oberfläche
PCT/DE2007/000901 WO2008011851A1 (fr) 2006-07-22 2007-05-18 Brûleur à flamme et procédé de brûlage au chalumeau d'une surface métallique

Publications (1)

Publication Number Publication Date
EP2044366A1 true EP2044366A1 (fr) 2009-04-08

Family

ID=38475981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07722449A Withdrawn EP2044366A1 (fr) 2006-07-22 2007-05-18 Brûleur à flamme et procédé de brûlage au chalumeau d'une surface métallique

Country Status (10)

Country Link
US (1) US20090214990A1 (fr)
EP (1) EP2044366A1 (fr)
JP (1) JP2009544925A (fr)
KR (1) KR20090037894A (fr)
CN (1) CN101460780A (fr)
BR (1) BRPI0715425A2 (fr)
DE (1) DE102006034014A1 (fr)
EA (1) EA012772B1 (fr)
MX (1) MX2009000447A (fr)
WO (1) WO2008011851A1 (fr)

Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
WO2013075750A1 (fr) * 2011-11-25 2013-05-30 Gega Lotz Gmbh Système de buse pour un chalumeau pour l'oxycoupage autogène, pourvu d'une gaine extérieure de type manchon servant à aspirer l'air extérieur
WO2014104116A1 (fr) 2012-12-27 2014-07-03 株式会社Ihi Système de fourniture d'une forme de dosage appropriée pour un médicament magnétique
DE102013101184A1 (de) * 2013-02-07 2014-08-07 Gega Lotz Gmbh Flämmblockbaugruppe
JP7455653B2 (ja) * 2016-06-15 2024-03-26 リケンテクノス株式会社 抗菌性ハードコート、及びその製造方法
CN108204590B (zh) * 2016-12-16 2020-01-24 中国石油化工股份有限公司 一种气井放喷测试用燃烧器
EP3962690A4 (fr) * 2019-05-03 2023-06-21 Thierry Rozot Systèmes, appareils et procédés de réduction de la taille d'un matériau
JP7270578B2 (ja) * 2020-05-12 2023-05-10 リケンテクノス株式会社 抗菌性ハードコート、及びその製造方法
JP7032473B2 (ja) * 2020-05-12 2022-03-08 リケンテクノス株式会社 抗菌性ハードコート、及びその製造方法
JP7270577B2 (ja) * 2020-05-12 2023-05-10 リケンテクノス株式会社 抗菌性ハードコート、及びその製造方法
CN113757660B (zh) * 2021-09-29 2023-08-29 广东美的白色家电技术创新中心有限公司 燃烧器和燃气灶

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US2825202A (en) * 1950-06-19 1958-03-04 Snecma Pipes traversed by pulsating flow gases
US3230924A (en) * 1962-12-26 1966-01-25 Sonic Dev Corp Sonic pressure wave generator
DE2823037C2 (de) * 1976-04-30 1980-06-26 E. Schlueter Fachhandel Fuer Schweisstechnik, 3014 Laatzen Schweiß-, Schneid-, Heiz- oder Flämmbrenner
US5304256A (en) * 1991-12-09 1994-04-19 Esab Welding Products, Inc. Scarfing method
US5714113A (en) * 1994-08-29 1998-02-03 American Combustion, Inc. Apparatus for electric steelmaking
DE4442362C1 (de) * 1994-11-18 1996-04-18 Mannesmann Ag Verfahren und Vorrichtung zum Behandeln von einer in einem metallurgischen Gefäß befindlichen Metallschmelze
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EP1179602A1 (fr) * 2000-08-07 2002-02-13 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé d'injection d'un gaz à l'aide d'une tuyère
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Also Published As

Publication number Publication date
US20090214990A1 (en) 2009-08-27
MX2009000447A (es) 2009-03-03
JP2009544925A (ja) 2009-12-17
BRPI0715425A2 (pt) 2013-01-01
DE102006034014A1 (de) 2007-10-31
KR20090037894A (ko) 2009-04-16
WO2008011851A1 (fr) 2008-01-31
EA200802429A1 (ru) 2009-06-30
CN101460780A (zh) 2009-06-17
EA012772B1 (ru) 2009-12-30

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