EP0092768B1 - Brûleur produisant du gaz chaud - Google Patents

Brûleur produisant du gaz chaud Download PDF

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Publication number
EP0092768B1
EP0092768B1 EP83103764A EP83103764A EP0092768B1 EP 0092768 B1 EP0092768 B1 EP 0092768B1 EP 83103764 A EP83103764 A EP 83103764A EP 83103764 A EP83103764 A EP 83103764A EP 0092768 B1 EP0092768 B1 EP 0092768B1
Authority
EP
European Patent Office
Prior art keywords
combustion chamber
burner according
chamber
combustion
burner
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
Application number
EP83103764A
Other languages
German (de)
English (en)
Other versions
EP0092768A1 (fr
Inventor
Reiner W. Hannen
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.)
MSK Verpackungs Systeme GmbH
Original Assignee
MSK Verpackungs Systeme GmbH
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
Priority claimed from DE19823215613 external-priority patent/DE3215613A1/de
Priority claimed from DE19823226615 external-priority patent/DE3226615A1/de
Application filed by MSK Verpackungs Systeme GmbH filed Critical MSK Verpackungs Systeme GmbH
Priority to AT83103764T priority Critical patent/ATE20139T1/de
Publication of EP0092768A1 publication Critical patent/EP0092768A1/fr
Application granted granted Critical
Publication of EP0092768B1 publication Critical patent/EP0092768B1/fr
Expired 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
    • F23D14/46—Details
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/74—Preventing flame lift-off
    • 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
    • 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
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D99/00—Subject matter not provided for in other groups of this subclass
    • F23D99/002—Burners specially adapted for specific applications
    • F23D99/004—Burners specially adapted for specific applications for use in particular heating operations

Definitions

  • the invention relates to a burner for generating a hot gas flow, in particular for shrinking plastic film, with a combustion chamber and a flame holder upstream of the combustion chamber for the passage of the combustion gases which are fed to the flame holder from a pressure distribution chamber, and an outlet connected downstream of the burner, which is connected to the Combustion chamber forms a flow channel with the same cross-sections that are constant in the direction of flow.
  • Such burners are needed to shrink plastic films, e.g. B. in the form of hoods that are drawn onto a stack of goods located on a pallet.
  • the shrinking can be done with handheld devices, but also with stationary installed, automatically working systems.
  • shrinking plastic film it is important that a uniform, flame-free hot gas flow is generated.
  • a burner of the type described above is known (DE-A-2645263).
  • This burner has a tubular combustion chamber with side slots for sucking in the combustion air.
  • the sucked-in combustion air creates turbulence in the combustion chamber, which leads to intensive swirling of the combustion gases and thus to short-range combustion, but the hot gas flow emerges from the outlet of the combustion chamber at a considerable speed. This high exit speed is undesirable if plastic film is to be shrunk.
  • complete combustion of the gases is also desirable, which can only be achieved if the gases are mixed well.
  • Another burner is known from DE-U-8 030 181.
  • rods which are arranged at a distance from one another on the flame holder, form partial flows of the combustion gases in the combustion chamber, which are mixed with one another in a slot die arranged downstream of the combustion chamber.
  • the burned gases in the slot die are also accelerated, so that the hot gas flow emerges from the outlet of the slot die at a considerable speed. This is particularly undesirable if the outlet of the burner is relatively close to the plastic film to be shrunk when shrinking. Then the film may burn.
  • the invention is therefore based on the object, on the one hand, of achieving thorough mixing of the combustion gases with regard to complete combustion and, on the other hand, of reducing the exit velocity of the hot gas stream.
  • the pressure distribution chamber has a fan-shaped plan and connects on the short side opposite the flame holder to a mixture supply pipe and on its broad side to the combustion chamber, which has an elongated, rectangular plan.
  • the pressure distribution chamber becomes a vortex chamber, in which the combustion gases not only have enough time, but also a sufficiently large path for intensive turbulence.
  • the combustion can then take place, the hot gas stream leaving the outlet at a moderate speed.
  • the speed of the hot gas flow can be influenced by the design of the pressure distribution chamber and the downstream combustion chamber or by the cross sections of the flow channels formed in this way.
  • a flow channel with a constant cross-section can be realized between the mixture feed pipe and the outlet, in which the change in the cross-sectional shapes leads to the desired intensive swirling of the combustion gases.
  • the height of the combustion chamber with the outlet in the flow direction is 1.2 to 1.5 times the width of the combustion chamber in order to prevent flames from escaping from the outlet.
  • the end sections of the walls defining the outlet can be widened to form a diffuser.
  • a flame holder which is preferably formed by a grid of parallel rods, forms a considerable flow resistance, it also causes a distribution of the gases flowing from the pressure distribution chamber into the combustion chamber.
  • this presupposes that the individual rods of the flame holder are positioned at a relatively precise distance from one another.
  • Such a precise arrangement is difficult to achieve in terms of manufacturing technology. Even with small deviations, there is a change in the pressure distribution in the combustion chamber and thus irregularities in the outflowing hot gas flow.
  • a burner which has reliable and constant properties with a simple structure, is characterized in that the flame holder is a profile rod which extends over the entire width of the pressure distribution chamber or combustion chamber and with the be neighboring walls forms passage gaps for the fuel gases.
  • the flame holder is only a single component, which can also be positioned very precisely using simple means. Reliable and consistent properties of the burner can also be achieved when producing larger quantities.
  • the rod-like flame holder divides, as it were, the gas stream entering the combustion chamber. The partial streams entering the combustion chamber through the passage gaps are drawn into the center of the combustion chamber under the effect of the dead water formed behind the profile rod and therefore cause less strain on the walls of the combustion chamber during their combustion.
  • a preferred embodiment of the invention is characterized in that the essentially flat walls of the pressure distribution chamber and the combustion chamber adjoin one another in the transition region with a bend and that the tube is arranged symmetrically to the bend. Then passage gaps with a venturi-like cross-section are created between the outside of the tube and the adjacent walls.
  • the length of the combustion chamber should be at least three times the height of the combustion chamber which is constant over the length.
  • the pressure distribution chamber can additionally have internals for directing and distributing the fuel gases. These internals should in particular be designed and arranged in such a way that the pressure conditions are the same across the width of the combustion chamber and the same amounts of fuel gas enter the combustion chamber.
  • the internals can in particular be formed from a sheet metal which extends essentially across the pressure distribution chamber and forms passage gaps with the walls of the pressure distribution chamber.
  • the sheet can also be perforated.
  • the burner 1 shown in the drawing is used to generate a hot gas stream from combustion gases. It is used for shrinking plastic film, e.g. B. of shrink hoods that are pulled onto a pallet stack.
  • the basic structure of the burner has an outlet 2 and a combustion chamber 3 connected upstream of this outlet 2.
  • Outlet 2 and combustion chamber 3 form a flow channel with a constant cross section. They are delimited by mutually parallel walls 4, 5, which are connected to a flame holder 6 upstream of the combustion chamber 3, which is arranged at the end of a pressure distribution chamber 7.
  • the pressure distribution chamber 7 has a fan-shaped plan in the projection shown in FIG. 1. It is connected to a mixture feed pipe 8 on the side opposite the flame holder 6.
  • the flame holder 6 extends over the entire length of the combustion chamber 3, like the combustion chamber 3 it has an elongated, rectangular plan.
  • the flame holder 6 is formed from a multiplicity of lattice bars 9 which are arranged parallel to one another and at a distance and are oriented transversely to the longitudinal direction of the combustion chamber 3.
  • the bars 9 can be made of spring steel with a diameter of about 3 mm, and the mutual spacing of the bars 9 can be about 0.5 mm.
  • the height of the combustion chamber 3 and outlet 2 in the flow direction is 1.2 to 1.5 times the width of the combustion chamber 3.
  • the free edges of the walls 4, 5 which define the outlet 2 are at 10 to form a diffuser and 11 angled.
  • the basic structure of the burner 1 shown in FIGS. 4 to 6 consists of a mixture feed pipe 32, to which a pressure distribution chamber 33 with a fan-shaped plan (FIG. 4) connects.
  • the pressure distribution chamber 33 merges into a combustion chamber 34 with an outlet 35.
  • the pressure distribution chamber 33 and also the combustion chamber 34 have an elongated rectangular cross section, onto which the side walls 36, 37 of the pressure distribution chamber 33 converge.
  • These side walls 36, 37 of the pressure distribution chamber 33 merge into adjoining side walls 39, 40 of the combustion chamber 34 with a kink 38.
  • the combustion chamber 34 has a length that is at least three times its height. For example, the length of the combustion chamber is at least 45 mm and its height t5 mm.
  • the width of the combustion chamber and therefore the width of the pressure distribution chamber in the transition area (kink 38) is 180 mm in the exemplary embodiment.
  • a flame 41 is arranged as a flame holder, which, as shown, is attached symmetrically to the bend 38 and which with the adjacent side walls 36, 37 and 39, 40 has passage gaps 12, 13 constant width for the fuel gases.
  • the pressure distribution chamber 33 has internals which, in the embodiment shown, are formed from a plate 14 which extends essentially transversely through the pressure distribution chamber 33 and with the side walls 36, 37 of the pressure distribution chamber 33 Passage gaps 15 and 16 forms.
  • the sheet 15 is folded in the middle, so that two legs are formed at an angle of 117 ° to one another in the exemplary embodiment, which are fastened in the region of their common folded edge 17 to the side walls 36, 37 of the pressure distribution chamber 33.
  • the legs extend in the direction of the combustion chamber and ensure that the fuel gases flowing out of the mixture supply pipe are distributed such that they enter the combustion chamber 34 at the same pressure and the same amount. It is not shown that the sheet 14 can also be perforated.
  • the long side walls 39, 40 of the combustion chamber 34 have expansion folds 20 which extend in the direction of the outflowing gases.
  • These expansion folds 20 can also be formed by angled and welded ends of adjacent wall sections. As a result, the burner geometry remains unchanged even under high thermal loads.

Landscapes

  • 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. Brûleur pour la production d'un courant de gaz chaud, en particulier pour le rétrécissement de feuille de matière synthétique, muni d'une chambre de combustion (3) et d'un accrocheur de flamme (6) placé avant la chambre de combustion (3), pour le passage des gaz de combustion qui sont amenés d'une chambre de répartition de pression (7) à l'accrocheur de flamme (6), ainsi que d'une sortie (2) placée après le brûleur (3), qui forme avec la chambre de combustion (3) un canal d'écoulement à sections égales et constantes, caractérisé en ce que la chambre de répartition de pression (7) présente une forme en éventail dans le plan et se raccorde sur le côté court opposé à l'accrocheur de flamme (6), à un tube d'amenée de mélange (8) ainsi que, sur son côté large, à la chambre de combustion (3) qui présente une forme rectangulaire allongée dans le plan.
2. Brûleur selon la revendication 1, caractérisé en ce que la hauteur de la chambre de combustion (3) avec sortie (2), dans la direction d'écoulement, représente 1, 2 à 1,5 fois la largeur de la chambre de combustion (3).
. 3. Brûleur selon l'une des revendications 1 et 2, caractérisé en ce que les tronçons terminaux (10, 11) des parois (4, 5) définissant la sortie (12) sont élargis pour former un diffuseur.
4. Brûleur selon l'une des revendications 1 à 3, caractérisé en ce que l'accrocheur de flamme (6) est formé par une grille de barreaux (9) parallèles entre eux.
5. Brûleur selon l'une des revendications 1 à 3, caractérisé en ce que l'accrocheur de flamme (41) est une barre profilée qui s'étend sur toute la largeur de la chambre de répartition de pression (33) ou de la chambre de combustion (34) et forme, avec les parois voisines (36, 37 ; 39, 40), des interstices de passage (12, 13) pour les gaz de combustion.
6. Brûleur selon la revendication 5, caractérisé en ce que l'accrocheur de flamme est un tube (41
7. Brûleur selon l'une des revendications 5 et 6, caractérisé en ce que les interstices de passage (12, 13) présentent des dimensions égales.
8. Brûleur selon l'une des revendications 6 et 7, caractérisé en ce que les parois pratiquement planes (36, 37 ; 39, 40) de la chambre de répartition de pression (33) et de la chambre de combustion (34) se raccordent entre elles dans la région de transition par un coude (38), et en ce que le tube (41) est disposé symétriquement par rapport au coude (38).
9. Brûleur selon l'une des revendications 1 à 8, caractérisé en ce que la longueur de la chambre de combustion (34) -vue dans la direction d'écoulement des gaz de combustion- représente au moins le triple de la hauteur, constante sur la longueur, de la chambre de combustion (34).
10. Brûleur selon l'une des revendications 1 à 9, caractérisé en ce que la chambre de répartition de pression (33) présente des agencements intérieurs (14) pour diriger et répartir les gaz de combustion.
11. Brûleur selon la revendication 10, caractérisé en ce que les agencements intérieurs sont formés par une plaque (14) qui s'étend pratiquement transversalement à travers la chambre de répartition de pression (33) et forme avec les parois (36, 37) de la chambre de répartition de pression (33) des interstices de passage (15, 16).
12. Brûleur selon la revendication 11, caractérisé en ce que la plaque (14) est perforée.
13. Brûleur selon l'une des revendications 1 à 12, caractérisé en ce que les parois latérales longues (39, 40) de la chambre de combustion (34) présentent des plis de dilatation (20) qui s'étendent dans la direction d'écoulement des gaz.
14. Brûleur selon la revendication 13, caractérisé en ce que les plis de dilatation (20) sont formés par des extrémités coudées et soudées entre elles de tronçons de paroi voisins.
EP83103764A 1982-04-27 1983-04-19 Brûleur produisant du gaz chaud Expired EP0092768B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83103764T ATE20139T1 (de) 1982-04-27 1983-04-19 Brenner zur erzeugung eines heissgasstromes.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19823215613 DE3215613A1 (de) 1982-04-27 1982-04-27 Brenner zur erzeugung eines heissgasstromes
DE3215613 1982-04-27
DE19823226615 DE3226615A1 (de) 1982-07-16 1982-07-16 Brenner zur erzeugung eines heissgasstromes, insbesondere zum schrumpfen von kunststoffolie
DE3226615 1982-07-16

Publications (2)

Publication Number Publication Date
EP0092768A1 EP0092768A1 (fr) 1983-11-02
EP0092768B1 true EP0092768B1 (fr) 1986-05-28

Family

ID=25801379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83103764A Expired EP0092768B1 (fr) 1982-04-27 1983-04-19 Brûleur produisant du gaz chaud

Country Status (2)

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EP (1) EP0092768B1 (fr)
DE (1) DE3363723D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606491B1 (fr) * 1986-11-12 1989-03-03 Stepack Dispositif d'allumage pour bruleur a haute vitesse de type a buse froide et bruleur utilisant ledit dispositif
CN103994438B (zh) * 2014-05-30 2016-02-10 长沙有色冶金设计研究院有限公司 一种反射炉烧嘴

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2645263A1 (de) * 1976-10-07 1978-04-13 Volker Wardt Heizgaserzeuger

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2822192A1 (de) * 1978-05-20 1979-11-22 Msk Verpackung Syst Gmbh Handschrumpfgeraet fuer die erzeugung eines heissluftstrahls zum schrumpfen von kunststoffolien o.dgl.
SE7910048L (sv) * 1979-12-06 1981-06-07 Assi Can Ab Anordning for att till ett veldefinierat omrade tillfora en het gasstrom
DE8030181U1 (de) * 1980-11-12 1981-09-10 Msk - Verpackungs-Systeme Gmbh, 4192 Kalkar Brenner für Breitschlitzdüse zur Erzeugung eines Heißgasstromes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2645263A1 (de) * 1976-10-07 1978-04-13 Volker Wardt Heizgaserzeuger

Also Published As

Publication number Publication date
EP0092768A1 (fr) 1983-11-02
DE3363723D1 (en) 1986-07-03

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