EP0970325B1 - Vormischbrenner mit einer durchflussmenge von mehr als 1000 liter/stunde - Google Patents

Vormischbrenner mit einer durchflussmenge von mehr als 1000 liter/stunde Download PDF

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Publication number
EP0970325B1
EP0970325B1 EP98914950A EP98914950A EP0970325B1 EP 0970325 B1 EP0970325 B1 EP 0970325B1 EP 98914950 A EP98914950 A EP 98914950A EP 98914950 A EP98914950 A EP 98914950A EP 0970325 B1 EP0970325 B1 EP 0970325B1
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EP
European Patent Office
Prior art keywords
flow
feed pipe
section
burner according
cross
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
EP98914950A
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English (en)
French (fr)
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EP0970325A1 (de
Inventor
Jean-Marie Truffaut
Geoff IRPHE UMR 6594 CNRS SEARBY
Louis IRPHE UMR 6594 CNRS BOYER
Gilles Cannet
Francis Briand
Philippe Pisot
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.)
Lincoln Electric Co France SA
Original Assignee
La Soudure Autogene Francaise
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Publication of EP0970325A1 publication Critical patent/EP0970325A1/de
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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
    • F23D14/38—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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/08—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2210/00—Noise abatement

Definitions

  • the present invention relates to a burner, such as a torch, of preferably monodard, with premix of flow rate greater than 1000 l / h of the type comprising a gas mixture supply pipe having a supply end of the gas mixture and a single nozzle for the establishment of the flame mounted at the other end of said pipe feed.
  • Burners, in particular torches, in particular of the type known premix monodard generally have at the end supply an injector ensuring the contacting of a gas fuel, from a first power source, with a gas oxidizer, from a second power source (see for example FR-A-322 011, US-A-4 886 447).
  • the supply line thus connects the injector to the nozzle.
  • This pipe is generally formed by a straight pipe on the essential of its length, commonly called a lance.
  • the spear is about 30 cm long. In practice, the spear has a bend at its outlet end.
  • the invention aims to provide a burner, in particular a torch, whose noise emissions caused by the flame are reduced.
  • the subject of the invention is a burner, such as a torch, of preferably monodard, with premix of flow rate greater than 1000 l / h of the type above, characterized in that the supply line is adapted for that at any point of at least one cross section thereof, the Reynolds number of the mixture flowing in the supply line is less than 3000, when the burner or torch operates in steady state at a flow rate greater than 1000 l / h.
  • the burner according to the invention is a torch, such as a monodard torch.
  • the invention also relates to the use of a torch according to the invention in an oxy-combustion process, putting using a mixture containing at least one combustible gas and at minus an oxidizing gas, such as a mixture containing oxygen and propane.
  • a monodard torch according to the invention can be applied to any brewing operation, from warm before removal ("straightening" in English), preheating before welding, heating for forming or any other processing operation thermal of a material preferably a metal or alloy material metallic.
  • the burner according to the invention can be applied to the combustion field, i.e. any process using an oxy-fuel flame, for example in an oven and / or in the glass working.
  • oxygen is the preferred oxidizer, it is possible to also, in some cases, use air, preferably compressed, as an oxidizing gas.
  • the torch 10 shown in Figure 1 includes an injector premix 12, a lance 14 forming a supply line for the mixture and a single end nozzle 16.
  • the injector 12 comprises a body 18 crossed by a conduit fuel gas supply 20.
  • the body 18 further comprises a side duct 22 for supplying oxidant gas.
  • the conduits 20 and 22 open into a threaded hole 24, into which a manifold 26 is screwed through through an axial passage 28 for feeding the gaseous mixture into the conduit 14.
  • the passage 28 has a diameter of approximately 3 mm and is connected to the conduits 20 and 22 by connections 30.
  • the passage 28 opens at the center of a flat transverse face of the collector, denoted 28A, which extends perpendicularly to the passage axis 28.
  • the pipe 14 is formed by a pipe of circular section having an internal diameter equal to approximately 21 mm and a length equal to 276 mm approx.
  • An inlet end 32 of the pipe 14 has a thread outside. It is screwed into the threaded hole 24. This end rests on the flat face 28A.
  • Line 14 includes, at the supply end 32, a open mixing chamber 34 into which the feed passage 28.
  • the section of the mixing chamber 34 is equal to the inner section of the pipe 14. This section is very greater than the section of the passage 28.
  • the section of the pipe supply increases suddenly according to the direction of flow of the mixed. This brutal variation in section is ensured here by a shoulder delimited by the face 28A.
  • the pipe 14 contains successive organs for regulating the gas flow spaced apart by clear sections.
  • a baffle 36 is arranged downstream of the end inlet 32. This defines with the flat face 28A of the injector the mixing chamber 34 which extends over 21 mm.
  • Chicane 36 is formed by an agglomerated set of elements analogues, for example independent balls 36A retained between two transverse end grids 36B.
  • 36A balls have a diameter 4 mm.
  • 36B grids consist of a braided wire mesh whose neighboring strands are spaced about 0.5 mm apart.
  • This baffle can also be formed by a porous material, in particular a sintered material.
  • the baffle 36 extends over a length of 30 mm. She is followed by an unobstructed tranquilization chamber 38 also extending over a length of 30 mm.
  • Chamber 38 is delimited downstream by a guide member 40 axial flow.
  • This organ is formed by a section with a length 24 mm, of a honeycomb structure whose walls extend along the axis of the pipe 14.
  • the member 40 is formed of an assembly of longitudinal walls dividing the pipe 14 into a set of parallel channels. The diameter of each channel is 4 mm.
  • the channels here have a hexagonal section. However, they can also be square or circular section.
  • a second chamber Downstream of the member 40, a second chamber is provided. still 42 extending over a length of 85 mm. She is delimited at its downstream end by a second axial guide member 44 formed by a honeycomb structure whose diameter of each channel is equal to 1 mm. This organ 44, the channels of which extend along the direction of flow, has a length of 6 mm.
  • a grid 46 Downstream of the member 44 is disposed a grid 46, the mesh of which is about 0.5 mm. This grid delimits with the organ 44 a room released from stilling 48 extending over 50 mm.
  • the grid 46 is separated from the outlet end of the pipe 14 by an open chamber 50 extending over 30 mm.
  • the nozzle 16 has an inner profile of revolution. It is delimited from line 14 to its outlet end 52 via a converge 54 having a general profile in S. Convergent 54 is tangentially connects to the outlet end of the pipe 14. The outlet end 52 of the nozzle has a diameter of 3 mm, so that the nominal mixing flow rate of such a nozzle is 2000 l / h.
  • the profile of the convergent 54 is for example defined by a polynomial of order 5 calculated according to the Bell and Metha method, described in publication "Bell, J.H. and Metha, R.D. Contraction Design for Small Low Speed Wind Tunnels, AIAA Journal, 27, 372-4, (1989) ".
  • This nozzle has a great contraction ratio.
  • the contraction ratio which is defined by the inlet section of the nozzle on its outlet section is approximately 50. From plus, the aspect ratio, i.e. the length of the nozzle over its diameter input is about 2.6.
  • the surface of the convergent 54 is chosen to be as smooth as possible.
  • the nozzle 16 is connected to the end of the pipe 14 by a threaded connection sleeve 56.
  • the positioning devices and for fixing members 36, 40, 44 and 46 constituted for example by tubular sections forming spacers between the members, are adapted to ensure the continuity of the inner wall of the lance, so that it is internally devoid of roughness, groove and variation abrupt section.
  • the pipe 14 of the torch described here has a section interior of large area compared to that of the outlet section of the nozzle.
  • the Reynolds number of mixture flowing in line 14 is at least one pipe cross-section less than 3000, when the torch operates in steady state.
  • the speed in the pipe is substantially equal to 2 m / s, which gives a Reynolds number substantially equal to 2000 in the cleared sections 38, 42, 48, 50 of the tube.
  • the flow of the gas mixture in the supply line is a substantially laminar flow.
  • Figure 2 presents experimental results of measurements of the noise level.
  • Noise levels were raised 0.5 m from the nozzle in the exit plan from it.
  • the reference levels have been obtained with a "Varial G2" type torch, sold in France by French Autogenic Welding. This torch was equipped a nozzle with a nominal mixing flow of 2000 l / h having a diameter 3 mm outlet.
  • the richness of the mixture used, propane and oxygen, was 1.33.
  • the inner diameter of the pipe cylindrical feed of such a torch is 8 mm.
  • the curve shows the sound levels recorded for this torch reference and the torch 10 of FIG. 1, for different flow rates ranging from 1200 l / h to 3000 l / h of the same mixture. These sound levels are represented respectively by black circles and white squares.
  • the noise emitted by a flame comes on the one hand from the sting (part central flame) and on the other hand the plume (peripheral part of the flame).
  • the torch according to the invention was designed in order to further reduce the turbulence present at the base of the sting.
  • the torch has been sized to obtain a substantially laminar flow inside the lance.
  • the combustible and oxidizing gases are brought into contact in the feed passage 28.
  • the sudden change in diameter at the end inlet 32 causes gas recirculation inside the chamber 34.
  • eddies arise at the exit from passage 28, which creates a turbulent flow in the chamber 34. This turbulent flow promotes the homogeneous mixing of gas.
  • the variation should from section from section of passage 28 to maximum section of the mixing chamber takes place over a short length along the axis of the pipe 14.
  • the profile must be understood on the outside a cone whose angle at the top is equal to 14 ° and preferably greater than or equal to 20 °.
  • the length of the mixing chamber is advantageously equal the diameter of the latter.
  • the flow of combustible and oxidizing gases mixed in the room 34 then flows randomly through the chicane 36.
  • the spatial scale of turbulence is thus reduced to one dimension on the order of the diameter of the balls 36A (4 mm).
  • the stilling chamber 38 then ensures a viscous dissipation of the vortices still present in the flow.
  • the axial guide member 40 then ensures attenuation of the fluctuations in transverse velocities in the flow. In particular, it directs the flow in the direction of the axis of the pipe 14.
  • the length of the member with a nest structure bee is four to ten times and preferably six to eight times the diameter of the channels constituting said organ.
  • the stilling chamber 42 arranged downstream of the member 40, must have a length sufficient to absorb the turbulence generated by the member 40.
  • the member 44 ensures with the downstream stabilization 48 a new reduction in speeds transverse in the flow and improves the directivity of the flow.
  • the grid 46 associated with the chamber 50 performs a damping final turbulence of the flow.
  • baffle 36 and the guide members axial flow 40, 44 further improves the reduction in the level of noise.
  • FIG 3 an alternative embodiment of the torch 10 in Figure 1.
  • This torch is indistinguishable from that of the Figure 1 only by its supply line.
  • This is formed by a tube 100 of circular section with internal diameter equal to 10 mm and of length equal to 221 mm.
  • This tube has two internal parts identical 102, 104 for axial guidance of the mixture.
  • These organs are formed by honeycomb structures whose walls extend longitudinally. These walls delimit channels of diameter equal to 1 mm.
  • These two sections 102, 104 each extend over a length 60 mm. They define between them a tranquilization chamber open bearing the reference 106. This extends over a length of 30 mm.
  • a chamber still 108 extending over a length of 50 mm.
  • a flow of the order about 2800 l / h leads to a speed in the supply line equal to 10 m / s.
  • the Reynolds number of the mixture flowing in the parallel channels bounded by the honeycomb structures is substantially equal to 500.
  • the Reynolds number of the flow is less than 3000 over the entire section of the pipe. This causes laminarization of the flow from which it results improved stabilization of the flame dart.
  • the torch described in Figure 3 generates a noise level significantly lower than the reference torch.
  • the torches described here have a straight lance. However, this may include a bent section (in particular at its output end), without the measured noise level being significantly increased.

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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)

Claims (14)

  1. Vormischbrenner mit einer Durchflußmenge von über 1000 l/h jener Art, die eine Leitung (14) zur Zuführung eines Gasgemisches mit einem Ende (32) zur Zuführung des Gasgemisches und einer am anderen Ende der Zuführungsleitung (14) angebrachten einzigen Düse (16) zur Erzeugung der Flamme umfaßt, dadurch gekennzeichnet, daß die Zuführungsleitung (14) so ausgeführt ist, daß an jeder Stelle mindestens eines Querschnitts davon die Reynoldssche Zahl des in der Zuführungsleitung (14) zirkulierenden Gemisches unter 3000 liegt, wenn der Brenner im Dauerzustand mit einer Durchflußrate von über 1000 l/h betrieben wird.
  2. Brenner nach Anspruch 1, dadurch gekennzeichnet, daß die Geschwindigkeit des Gemisches in dem Querschnitt unter 5 m/s beträgt.
  3. Brenner nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Zuführungsleitung (14) über mindestens einen Teilabschnitt (102, 104) sich in Strömungsrichtung erstreckende Längswände aufweist, die den Querschnitt der Zuführungsleitung (14) in benachbarte Kanäle unterteilen, und daß an jeder Stelle mindestens eines Querschnitts des unterteilten Teilabschnitts die Reynoldssche Zahl des in der Zuführungsleitung (14) zirkulierenden Gemisches unter 3000 liegt, wenn der Brenner im Dauerzustand betrieben wird.
  4. Brenner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Zuführungsleitung (14) am Zuführungsende (32) eine freie Mischkammer (34) aufweist, in die ein Durchgang (28) zur Zuführung eines Gasgemisches mündet, wobei der Querschnitt der Mischkammer (34) größer ist als der Querschnitt des Zuführungsdurchgangs (28) und sich der Querschnitt der Zuführungsleitung (14) in Strömungsrichtung vom Zuführungsdurchgang (28) zur Mischkammer (34), insbesondere an einer Schulter (28A), plötzlich vergrößert.
  5. Brenner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Zuführungsleitung (14) über einen Teilabschnitt eine eine Ablenkvorrichtung (36) bildende Anordnung von Elementen (36A) aufweist, die in Strömungsrichtung durch einen freien Teilabschnitt (38) verlängert wird.
  6. Brenner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Zuführungsleitung (14) über mindestens einen Teilabschnitt ein Glied (40, 44; 102, 104) zur Axialführung der Strömung aufweist.
  7. Brenner nach Anspruch 6, dadurch gekennzeichnet, daß dem oder jedem Glied (40, 44; 102, 104) zur Axialführung der Strömung ein freier Teilabschnitt (42, 48; 106, 108) zur Strömungsberuhigung nachgeschaltet ist.
  8. Brenner nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß das oder jedes Axialführungsglied (40, 44; 102, 104) sich in Strömungsrichtung erstreckende Längswände aufweist, welche den Querschnitt der Zuführungsleitung (14) in ein gleichmäßiges Muster definierende benachbarte Kanäle unterteilen.
  9. Brenner nach Anspruch 8, dadurch gekennzeichnet, daß die Querschnittsflächen der Kanäle eines gleichen Axialführungsglieds (40, 44; 102, 104) im wesentlichen gleich sind.
  10. Brenner nach Anspruch 9, dadurch gekennzeichnet, daß die in Strömungsrichtung gemessene Länge der Kanäle des oder jedes Führungsglieds (40, 44) zwischen dem Vier- bis Zehnfachen, insbesondere dem Sechs- bis Achtfachen, des Kanaldurchmessers beträgt.
  11. Brenner nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß mindestens zwei Teilabschnitte der Zuführungsleitung (14) Axialführungsglieder (40, 44) aufweisen und daß sich die Querschnittsflächen der Kanäle in Strömungsrichtung des Gemisches von einem Glied zum nächsten verkleinern.
  12. Brenner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Düse (16) innen von der Leitung (14) bis zu ihrem Ausgangsende (52) durch eine allgemein S-förmige Konvergierung (54) begrenzt wird, die sich tangential an der Zuführungsleitung (14) anschließt.
  13. Brenner nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß es sich dabei um einen Schweißbrenner, vorzugsweise einen Schweißbrenner mit einzelnem Flammenkegel, handelt.
  14. Verwendung eines Schweißbrenners, vorzugsweise mit einzelnem Flammenkegel, nach Anspruch 13 in einem Sauerstoffverbrennungsverfahren unter Einsatz eines Gasgemisches, das mindestens ein Brenngas und mindestens ein Oxidationsgas enthält.
EP98914950A 1997-03-28 1998-03-19 Vormischbrenner mit einer durchflussmenge von mehr als 1000 liter/stunde Expired - Lifetime EP0970325B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9703879A FR2761457B1 (fr) 1997-03-28 1997-03-28 Chalumeau monodard a premelange de debit superieur a 1000 litres/heure
FR9703879 1997-03-28
PCT/FR1998/000553 WO1998044296A1 (fr) 1997-03-28 1998-03-19 Bruleur, tel un chalumeau monodard, a premelange de debit superieur a 1000 litres/heure

Publications (2)

Publication Number Publication Date
EP0970325A1 EP0970325A1 (de) 2000-01-12
EP0970325B1 true EP0970325B1 (de) 2001-10-31

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Application Number Title Priority Date Filing Date
EP98914950A Expired - Lifetime EP0970325B1 (de) 1997-03-28 1998-03-19 Vormischbrenner mit einer durchflussmenge von mehr als 1000 liter/stunde

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EP (1) EP0970325B1 (de)
AU (1) AU6925498A (de)
DE (1) DE69802273T2 (de)
ES (1) ES2167071T3 (de)
FR (1) FR2761457B1 (de)
WO (1) WO1998044296A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101430091B (zh) * 2007-11-05 2010-07-21 中南大学 催化燃烧预混器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10024410A1 (de) * 2000-05-19 2001-11-22 Kromschroeder Ag G Anordnung zum Regeln einer Verbrennungseinrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR322011A (fr) * 1902-06-11 1903-01-24 Cie Universelle D Acetylene Chalumeau oxy-acétylénique
DE1913014C3 (de) * 1969-03-14 1974-02-28 Aga Ab, Lidingoe (Schweden) Brenner für Brenngas und Sauerstoffoder Luft als Oxydator
DE2009357A1 (de) * 1970-02-27 1971-09-09 Kreis, Philipp, 8000 München Gasbrenner
FR2264247A1 (en) * 1974-03-14 1975-10-10 Pleven Gicquel Sarl Granits Cutting torch for granite - has venturi outlet at combustion chamber outlet
JPS52148839A (en) * 1976-06-04 1977-12-10 Hitachi Ltd Gas burner
FR2624255B3 (fr) * 1987-12-07 1990-03-16 Virax Sa Bruleur aero-gaz a flamme dard tres stable constituant la partie fonctionnelle d'une lance de chalumeau
US4886447A (en) * 1988-05-16 1989-12-12 Goss, Inc. Burner assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101430091B (zh) * 2007-11-05 2010-07-21 中南大学 催化燃烧预混器

Also Published As

Publication number Publication date
WO1998044296A1 (fr) 1998-10-08
DE69802273T2 (de) 2002-07-11
FR2761457A1 (fr) 1998-10-02
ES2167071T3 (es) 2002-05-01
DE69802273D1 (de) 2001-12-06
AU6925498A (en) 1998-10-22
FR2761457B1 (fr) 1999-05-14
EP0970325A1 (de) 2000-01-12

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