EP0092768A1 - Burner producing hot gas - Google Patents

Burner producing hot gas Download PDF

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Publication number
EP0092768A1
EP0092768A1 EP83103764A EP83103764A EP0092768A1 EP 0092768 A1 EP0092768 A1 EP 0092768A1 EP 83103764 A EP83103764 A EP 83103764A EP 83103764 A EP83103764 A EP 83103764A EP 0092768 A1 EP0092768 A1 EP 0092768A1
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EP
European Patent Office
Prior art keywords
combustion chamber
burner according
pressure distribution
burner
chamber
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.)
Granted
Application number
EP83103764A
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German (de)
French (fr)
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EP0092768B1 (en
Inventor
Reiner W. Hannen
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MSK Verpackungs Systeme GmbH
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MSK Verpackungs Systeme GmbH
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Publication date
Priority claimed from DE19823215613 external-priority patent/DE3215613A1/en
Priority claimed from DE19823226615 external-priority patent/DE3226615A1/en
Application filed by MSK Verpackungs Systeme GmbH filed Critical MSK Verpackungs Systeme GmbH
Priority to AT83103764T priority Critical patent/ATE20139T1/en
Publication of EP0092768A1 publication Critical patent/EP0092768A1/en
Application granted granted Critical
Publication of EP0092768B1 publication Critical patent/EP0092768B1/en
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    • 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
    • F23D14/72—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, 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
    • 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
    • F23D91/00—Burners specially adapted for specific applications, not otherwise provided for
    • F23D91/02—Burners specially adapted for specific applications, not otherwise provided for for use in particular heating operations

Definitions

  • the invention relates to a burner for generating a hot gas stream, 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.
  • Such burners are required for shrinking plastic films, for example in the form of hoods, which 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. It is important when shrinking plastic film that a uniform flame-free hot gas flow is generated.
  • a burner of the type described above is known (DE-GM 80 30 181). With this burner form rods, which are arranged at a distance from one another on the flame holder, in the combustion chamber partial streams of the combustion gases which are mixed with one another in a slot nozzle arranged downstream of the combustion chamber. This creates turbulence, which leads to an intensive swirling of the combustion gases and thus to combustion in a short way. At the same time, the burned gases in the slot die are also accelerated, so that the hot gas stream 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 object of the invention is to reduce the exit velocity of the hot gas flow in a burner of the type described in the introduction.
  • combustion chamber and the outlet form a flow channel with the same cross sections which are constant in the flow direction.
  • the combustion chamber or the flame holder should have an elongated rectangular base. This is aerodynamically favorable and enables a burner with a large range of effectiveness to be produced using simple means. This is particularly true when the flame holder is formed by a grid of parallel rods.
  • the length 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 Since a flame holder forms a considerable flow resistance as described above, it also causes a distribution of the gases flowing from the pressure distribution into the combustion chamber. However, this presupposes that the individual rods of the flame holder are positioned at a relatively precise distance from one another. Such a precise arrangement, however, 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 that is reliable with a simple structure and has constant properties 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 forms passage gaps for the fuel gases with the adjacent walls.
  • 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 substantially Connect the flat walls of the pressure distribution chamber and the combustion chamber in the transition area to each other with a bend and that the pipe is arranged symmetrically to the bend. Then there are passage gaps with a venturi-like cross-section between the outer sides of the tube and the adjacent walls.
  • the length of the combustion chamber in order to enable complete combustion of the combustion gases before they leave the combustion chamber, should be at least three times the (over the length) constant height of the combustion chamber.
  • the pressure distribution chamber can additionally have internals for directing and distributing the fuel gases. These internals should in particular be designed and arranged such 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. 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 connected upstream of the combustion chamber 3 and 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 3mm and the mutual spacing of the bars 9 can be about 0.5mm.
  • 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 and to form a diffuser 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) is connected.
  • 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 subsequent 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 is 15 mm.
  • the width of the combustion chamber and thus also the width of the pressure distribution chamber in the transition region (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 passage gaps 12, 13 constant width for the fuel gases.
  • the pressure distribution chamber 33 has built-in components which, in the embodiment shown, are formed from a sheet 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 from each other in the exemplary embodiment 117 0 , 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 towards the combustion chamber and ensure that the fuel gases flowing out of the mixture supply pipe are distributed in this way be 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.

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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)

Abstract

1. A burner for producing a hot gas flow, in particular for shrinking film of plastics material, having a combustion chamber (3) and a flame retention baffle (6) arranged upstream of the combustion chamber (3) for the throughflow of the combustion gases which are supplied to the flame retention baffle (6) from a pressure-distribution chamber (7), and an outlet (2) which is arranged downstream of the burner (3) and which forms with the combustion chamber (3) a flow duct with equal cross-sections which are constant in the direction of flow, characterized in that the pressure-distribution chamber (7) has a fan-shaped outline and on the short side opposite the flame retention baffle (6) it is joined to a mixture supply pipe (8) and on its wide side it is joined to the combustion chamber (3) which has an elongate rectangular outline.

Description

Die Erfindung betrifft einen Brenner zur Erzeugung eines Heißgasstromes, insbesondere zum Schrumpfen von Kunststoffolie, mit einer Brennkammer und einem der Brennkammer vorgeschalteten Flammenhalter für den Durchtritt der Verbrennungsgase, die dem Flammenhalter aus einer Druckverteilungskammer zugeführt werden, sowie einem dem Brenner nachgeschalteten Auslaß.The invention relates to a burner for generating a hot gas stream, 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.

Derartige Brenner benötigt man zum Einschrumpfen von Kunststoffolien, zum Beispiel in Form von Hauben, die auf einen auf einer Palette befindlichen Gutstapel gezogen sind. Das Einschrumpfen kann mit Handgeräten, aber auch mit stationär installierten, automatisch arbeitenden Anlagen vorgenommen werden. Wichtig beim Schrumpfen von Kunststoffolie ist, daß ein gleichmäßiger flammenfreier Heißgasstrom erzeugt wird.Such burners are required for shrinking plastic films, for example in the form of hoods, which 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. It is important when shrinking plastic film that a uniform flame-free hot gas flow is generated.

Ein Brenner der eingangs beschriebenen Gattung ist bekannt (DE-GM 80 30 181). Bei diesem Brenner bilden Stäbe, die im Abstand voneinander auf den Flammenhalter angeordnet sind, in der Brennkammer Teilströme der Verbrennungsgase, die in einer der Brennkammer nachgeschalteten Breitschlitzdüse miteinander vermischt werden. Dabei entstehen Turbulenzen, die zu einer intensiven Verwirbelung der Verbrennungsgase und damit zu einer Verbrennung auf einem kurzen Weg führen. Gleichzeitig werden die verbrannten Gase in der Breitschlitzdüse aber auch beschleunigt, so daß der Heißgasstrom mit erheblicher Geschwindigkeit aus dem Auslaß der Breitschlitzdüse austritt. Das ist insbesondere dann unerwünscht, wenn der Auslaß des Brenners sich beim Schrumpfen verhältnismäßig dicht vor der zu schrumpfenden Kunststoffolie befindet. Dann sind nämlich Verbrennungen der Folie möglich.A burner of the type described above is known (DE-GM 80 30 181). With this burner form rods, which are arranged at a distance from one another on the flame holder, in the combustion chamber partial streams of the combustion gases which are mixed with one another in a slot nozzle arranged downstream of the combustion chamber. This creates turbulence, which leads to an intensive swirling of the combustion gases and thus to combustion in a short way. At the same time, the burned gases in the slot die are also accelerated, so that the hot gas stream 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.

Aufgabe der Erfindung ist es, bei einem Brenner der eingangs beschriebenen Gattung die Austrittsgeschwindigkeit des Heißgasstromes zu reduzieren.The object of the invention is to reduce the exit velocity of the hot gas flow in a burner of the type described in the introduction.

Diese Aufgabe wird dadurch gelöst, daß die Brennkammer und der Auslaß einen Strömungskanal mit gleichen und in Strömungsrichtung konstanten Querschnitten bilden.This object is achieved in that the combustion chamber and the outlet form a flow channel with the same cross sections which are constant in the flow direction.

Überraschenderweise hat sich gezeigt, daß auch dann, wenn in der Brennkammer keine Teilströme gebildet werden, eine Verbrennung auf kurzem Wege eintritt und daß der Heißgasstrom den Auslaß mit mäßiger Geschwindigkeit verläßt, so daß er auf dem Wege bis zur Kunststoffolie genügend Zeit zum Einmischen von kühlerer Umgebungsluft hat.Surprisingly, it has been shown that even if no partial flows are formed in the combustion chamber, combustion occurs over a short distance and that the hot gas flow leaves the outlet at a moderate speed, so that it has enough time on the way to the plastic film to mix in cooler Ambient air.

Nach bevorzugter Ausführung der Erfindung soll die Brennkammer bzw. der Flammenhalter eine langgestreckte rechteckige Grundfläche besitzen. Das ist strömungstechnisch günstig und ermöglicht es, einen Brenner großer Wirkungsbreite mit einfachen Mitteln herzustellen. Das gilt insbesondere dann, wenn der Flammenhalter von einem Gitter aus zueinander parallelen Stäben gebildet ist.According to a preferred embodiment of the invention, the combustion chamber or the flame holder should have an elongated rectangular base. This is aerodynamically favorable and enables a burner with a large range of effectiveness to be produced using simple means. This is particularly true when the flame holder is formed by a grid of parallel rods.

Es genügt, wenn die Länge der Brennkammer mit Auslaß in Strömungsrichtung das 1,2 bis 1,5-fache der Breite der Brennkammer beträgt, um zu verhindern, daß Flammen aus dem Auslaß austreten.It is sufficient if the length 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.

Um das Einmischen frischer Umgebungsluft in den den Auslaß verlassenden Heißgasstrom zu verbessern, können die Endabschnitte der den Auslaß definierenden Wandungen zur Bildung eines Diffusors aufgeweitet sein.In order to improve the mixing of fresh ambient air into the hot gas stream leaving the outlet, the end sections of the walls defining the outlet can be widened to form a diffuser.

Da ein Flammenhalter wie oben beschrieben einen erheblichen Strömungswiderstand bildet, bewirkt er gleichzeitig auch eine Verteilung der aus der Druckverteilung in die Brennkammer strömenden Gase. Das setzt allerdings voraus, daß die einzelnen Stäbe des Flammenhalters mit verhältnismäßig genauem Abstand zueinander positioniert sind. Eine solche präzise Anordnung ist aber herstellungstechnisch nur schwer zu verwirklichen. Bereits bei kleineren Abweichungen kommt es zu einer Änderung der Druckverteilung in der Brennkammer und damit zu Unregelmäßigkeiten des ausströmenden Heißgasstromes.Since a flame holder forms a considerable flow resistance as described above, it also causes a distribution of the gases flowing from the pressure distribution into the combustion chamber. However, this presupposes that the individual rods of the flame holder are positioned at a relatively precise distance from one another. Such a precise arrangement, however, 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.

Ein Brenner, der bei einfachem Aufbau zuverlässige und gleichbleibende Eigenschaften aufweist, ist dadurch gekennzeichnet, daß der Flammenhalter ein Profilstab ist, der sich über die gesamte Breite der Druckverteilungskammer bzw. Brennkammer erstreckt und mit den benachbarten Wandungen Durchtrittsspalte für die Brenngase bildet.A burner that is reliable with a simple structure and has constant properties, 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 forms passage gaps for the fuel gases with the adjacent walls.

Bei diesem Brenner ist der Flammenhalter nur noch ein einziges Bauteil, das sich auch herstellungstechnisch mit einfachen Mitteln sehr genau positionieren läßt. Auch bei Fertigung größerer Stückzahlen lassen sich zuverlässige und gleichbleibende Eigenschaften des Brenners verwirklichen. Der stabartige Flammenhalter teilt gleichsam den in die Brennkammer eintretenden Gasstrom. Die durch die Durchtrittsspalte in die Brennkammer eintretenden Teilströme werden unter der Wirkung des hinter dem Profilstab gebildeten Totwassers in die Mitte der Brennkammer gezogen und belasten bei ihrer Verbrennung deshalb die Wandungen der Brennkammer weniger.In this burner, 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.

Besonders günstige Verhältnisse entstehen dann, wenn der Flammenhalter ein Rohr ist, welches stromabseitig ein ausgeprägtes Totwassergebiet erzeugt, das nicht nur die gewünschte Führung der Teilströme zur Mitte der Brennkammer hin bewirkt, sondern auch eine intensive Verwirbelung der Brenngase erzeugt. Das gilt insbesondere dann, wenn die Durchtrittsspalte gleiche Abmessungen besitzen.Particularly favorable conditions arise when the flame holder is a tube which creates a pronounced dead water area downstream, which not only causes the desired flow of the partial flows towards the center of the combustion chamber, but also produces an intensive swirling of the fuel gases. This applies in particular if the passage gaps have the same dimensions.

Eine bevorzugte Ausführung der Erfindung ist dadurch gekennzeichnet, daß die im wesentlichen ebenen Wandungen von Druckverteilungskammer und Brennkammer im Übergangsbereich mit einem Knick aneinander anschließen und daß das Rohr symmetrisch zum Knick angeordnet ist. Dann entstehen nämlich zwischen den Außenseiten des Rohres und den benachbarten Wandungen Durchtrittsspalte mit venturiartigem Querschnitt.A preferred embodiment of the invention is characterized in that the substantially Connect the flat walls of the pressure distribution chamber and the combustion chamber in the transition area to each other with a bend and that the pipe is arranged symmetrically to the bend. Then there are passage gaps with a venturi-like cross-section between the outer sides of the tube and the adjacent walls.

Um eine vollständige Verbrennung der Brenngase vor Austritt aus der Brennkammer zu ermöglichen, sollte die Länge der Brennkammer, - in Strömungsrichtung der Brenngase gesehen -, wenigstens das Dreifache der (über die Länge) konstanten Höhe der Brennkammer betragen.In order to enable complete combustion of the combustion gases before they leave the combustion chamber, the length of the combustion chamber, as viewed in the flow direction of the combustion gases, should be at least three times the (over the length) constant height of the combustion chamber.

Um die Druckverteilung über die Breite der Brennkammer zu verbessern, kann die Druckverteilungskammer zusätzlich noch Einbauten zur Lenkung und Verteilung der Brenngase aufweisen. Diese Einbauten sollten insbesondere so gestaltet und angeordnet sein, daß über die Breite der Brennkammer gleiche Druckverhältnisse herrschen und jeweils gleiche Brenngasmengen in die Brennkammer eintreten.In order to improve the pressure distribution across the width of the combustion chamber, the pressure distribution chamber can additionally have internals for directing and distributing the fuel gases. These internals should in particular be designed and arranged such 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.

Die Einbauten können insbesondere von einem Blech gebildet sein, welches sich im wesentlichen quer über die Druckverteilungskammer erstreckt und mit den Wandungen der Druckverteilungskammer Druchtrittsspalte bildet. Zusätzlich kann das Blech aber auch gelocht sein.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. In addition, the sheet can also be perforated.

Im folgenden werden ein in der Zeichnung dargestellte Ausführungsbeispiele der Erfindung erläutert; es zeigen:

  • Fig. einen Längsschnitt durch einen Brenner,
  • Fig. 2 einen Schnitt in Richtung II-II durch den Gegenstand nach Fig. 1,
  • Fig. 3 einen Schnitt in Richtung III-III durch den Gegenstand nach Fig. 1.
  • Fig. 4 eine Draufsicht auf einen anderen Brenner,
  • Fig. 5 einen Schnitt in Richtung V-V durch den Gegenstand nach Fig. 4,
  • Fig. 6 eine Ansicht mit Teilschnitt in Richtung VI-VI nach Fig. 4.
An exemplary embodiment of the invention illustrated in the drawing is explained below; show it:
  • FIG. 1 shows a longitudinal section through a burner,
  • 2 shows a section in the direction II-II through the object according to FIG. 1,
  • 3 shows a section in the direction III-III through the object according to FIG. 1.
  • 4 is a plan view of another burner,
  • 5 shows a section in the direction VV through the object according to FIG. 4,
  • 6 is a view with partial section in the direction VI-VI of FIG. 4th

Der in der Zeichnung dargestellte Brenner 1 dient zur Erzeugung eines Heißgasstromes aus Verbrennungsgasen. Er wiro eingesetzt beim Schrumpfen von Kunststoffolie, z.B. von Schrumpfhauben, die auf einen Palettenstapel gezogen sind.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. of shrink hoods that are pulled onto a pallet stack.

Der Brenner weist in seinem grundsätzlichen Aufbau einen Auslaß 2 und eine diesem Auslaß 2 vorgeschaltete Brennkammer 3 auf. Auslaß 2 und Brennkammer 3 bilden einen Strömungskanal mit konstantem Querschnitt. Sie werden begrenzt von zueinander parallelen Wandungen 4,5, die an einen der Brennkammer 3 vorgeschalteten Flammenhalter 6 angeschlossen sind, der am Ende einer Druckverteilungskammer 7 angeordnet ist. Die Druckverteilungskammer 7 weist in der in Fig. 1 dargestellten Projektion einen fächerförmigen Grundriß auf. Sie is: an der dem Flammenhalter 6 gegenüberliegenden Seite an ein Gemischzuführungsrohr 8 angeschlossen.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 connected upstream of the combustion chamber 3 and 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.

Der Flammenhalter 6 erstreckt sich über die gesamte Länge der Brennkammer 3, er besitzt wie die Brennkammer 3 einen langestreckten, rechteckigen Grundriß. Der Flammenhalter 6 wird gebildet aus einer Vielzahl von parallel zueinander und mit Abstand angeordneten Gitterstäben 9, die quer zur Längsrichtung der Brennkammer 3 ausgerichtet sind. Die Gitterstäbe 9 können aus Federstahl mit einem Durchmesser von ca. 3mm bestehen und der gegenseitige Abstand der Gitterstäbe 9 kann dabei etwa 0,5mm betragen.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 3mm and the mutual spacing of the bars 9 can be about 0.5mm.

Die Höhe von Brennkammer 3 und Auslaß 2 in Strömungsrichtung beträgt das 1,2 bis 1,5-fache der Breite der Brennkammer 3. Die freien Ränder der Wandungen 4,5, die den Auslaß 2 definieren, sind zur Bildung eines Diffusors bei 10 und 11 abgewinkelt.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 and to form a diffuser 11 angled.

Der in den Fig. 4 bis 6 dargestellte Brenner 1 besteht in seinem grundsätzlichen Aufbau aus einem Gemischzuführungsrohr 32, an das sich eine Druckverteilungskammer 33 mit fächerförmigem Grundriß (Fig. 4) anschließt. Die Druckverteilungskammer 33 geht in eine Brennkammer 34 mit Auslaß 35 über. Im Übergangsbereich zwischen Druckverteilungskammer 33 und Brennkammer 34 besitzt die Druckverteilungskammer 33 und auch die Brennkammer 34 einen langgestreckten rechteckigen Querschnitt, auf den die Seitenwandungen 36,37 der Druckverteilungskammer 33 konvergierend zulaufen. Diese Seitenwandungen 36,37 der Druckverteilungskammer 33 gehen mit einem Knick 38 in anschließende Seitenwandungen 39,40 der Brennkammer 34 über. Die Brennkammer 34 hat eine Länge, die wenigstens das Dreifache ihrer Höhe beträgt. Beispielsweise beträgt die Länge der Brennkammer wenigstens 45 mm und ihre Höhe 15 mm. Die Breite der Brennkammer und damit auch die Breite der Druckverteilungskammer im Übergangsbereich (Knick 38) beträgt beim Ausführungsbeispiel 180 mm.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) is connected. The pressure distribution chamber 33 merges into a combustion chamber 34 with an outlet 35. In the transition area between the pressure distribution chamber 33 and the combustion chamber 34, 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 subsequent 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 is 15 mm. The width of the combustion chamber and thus also the width of the pressure distribution chamber in the transition region (kink 38) is 180 mm in the exemplary embodiment.

Im Übergangsbereich zwischen Druckverteilungskammer 33 und Brennkammer 34 ist als Flammenhalter ein sich über die gesamte Breite erstreckendes Rohr 41 angeordnet, welches, wie dargestellt, symmetrisch zum Knick 38 angebracht ist und welches mit den benachbarten Seitenwandungen 36,37 bzw. 39,40 Durchtrittsspalte 12,13 gleichbleibender Breite für die Brenngase bildet.In the transition area between the pressure distribution chamber 33 and the combustion chamber 34, 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 passage gaps 12, 13 constant width for the fuel gases.

Zur Verbesserung der Druckverteilung der Brenngase bei Eintritt in die Brennkammer 34 weist die Druckverteilungskammer 33 Einbauten auf, die bei der dargestellten Ausführung einem Blech 14 gebildet sind, welches sich im wesentlichen quer durch die Druckverteilungskammer 33 erstreckt und mit den Seitenwandungen 36,37 der Druckverteilungskammer 33 Durchtrittsspalte 15 bzw. 16 bildet. Das Blech 15 ist in der Mitte gekantet, so daß zwei unter einem Winkel von beim Ausführungsbeispiel 1170 zueinander gerichtete Schenkel entstehen, die im Bereich ihrer gemeinsamen Faltkante 17 an den Seitenwandungen 36,37 der Druckverteilungskammer 33 befestigt sind. Die Schenkel erstrecken sich, wie dargestellt, in Richtung auf die Brennkammer und sorgen dafür, daß die aus dem Gemischzuführungsrohr strömenden Brenngase so verteilt werden, daß sie bei gleichem Druck und gleicher Menge in die Brennnkammer 34 eintreten. Nicht dargestellt ist, daß das Blech 14 zusätzlich noch gelocht sein kann.In order to improve the pressure distribution of the fuel gases when entering the combustion chamber 34, the pressure distribution chamber 33 has built-in components which, in the embodiment shown, are formed from a sheet 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 from each other in the exemplary embodiment 117 0 , 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, as shown, extend towards the combustion chamber and ensure that the fuel gases flowing out of the mixture supply pipe are distributed in this way be 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.

In den Fig. 4 und 5 ist noch dargestellt, daß auf der Seitenwandung 40 der Brennkammer 34 ein Stutzen 18 mit Innengewinde 19 angebracht sein kann.4 and 5 it is also shown that on the side wall 40 of the combustion chamber 34 a nozzle 18 with an internal thread 19 can be attached.

Außerdem weisen die langen Seitenwandungen 39,40 der Brennkammer 34 Dehnungsfalten 20 auf, die sich in Richtung der abströmenden Gase erstrecken. Diese Dehnungsfalten 20 können auch von abgewinkelten und miteinander verschweißten Enden benachbarter Wandungsabschnitte gebildet sein. Dadurch bleibt die Brennergeometrie auch bei starken thermischen Belastungen unverändert.In addition, 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.

Claims (15)

1. Brenner zur Erzeugung eines Heißgasstromes, insbesondere zum Schrumpfen von Kunststoffolie, mit einer Brennkammer und einem der Brennkammer vorgeschalteten Flammenhalter für den Durchtritt der Verbrennungsgase, die dem Flammenhalter aus einer Druckverteilungskammer zugeführt werden, sowie einem dem Brenner nachgeschalteten Auslaß, dadurch gekennzeichnet, daß die Brennkammer (3) und der Auslaß (2) einen Strömungskanal mit gleichen und in Strömungsrichtung konstanten Querschnitten bilden.1. 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, characterized in that the The combustion chamber (3) and the outlet (2) form a flow channel with the same cross-sections that are constant in the direction of flow. 2. Brenner nach Anspruch 1, dadurch gekennzeichnet, daß die Brennkammer (3) bzw. der Flammenhalter (6) eine langgestreckte rechteckige Grundfläche besitzen.2. Burner according to claim 1, characterized in that the combustion chamber (3) or the flame holder (6) have an elongated rectangular base. 3. Brenner nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Höhe der Brennkammer (3) mit Auslaß (2) in Strömungsrichtung das 1,2 bis 1,5-fache der Breite der Brennkammer (3) beträgt.3. Burner according to claim 1 or 2, characterized in that the height of the combustion chamber (3) with outlet (2) in the flow direction is 1.2 to 1.5 times the width of the combustion chamber (3). 4. Brenner nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Endabschnitte (10, 11) der den Auslaß (2) definierenden Wandungen (4, 5) zur Bildung eines Diffusors aufgeweitet sind.4. Burner according to one of claims 1 to 3, characterized in that the end portions (10, 11) of the outlet (2) defining walls (4, 5) are expanded to form a diffuser. 5. Brenner nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Flammenhalter (6) von einem Gitter aus zueinander parallelen Stäben (9) gebildet ist.5. Burner according to one of claims 1 to 4, characterized in that the flame holder (6) is formed by a grid of mutually parallel rods (9). 6. Brenner nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Flammenhalter (11) ein Profilstab ist, der sich über die gesamte Breite der Druckverteilungskammer (3) bzw. Brennkammer (4) erstreckt und mit den benachbarten Wandungen (6,7 bzw. 9,10) Durchtrittsspalte (12,13) für die Brenngase bildet.6. Burner according to one of claims 1 to 4, characterized in that the flame holder (11) is a profile rod which extends over the entire width of the pressure distribution chamber (3) or combustion chamber (4) and with the adjacent walls (6, 7 or 9.10) forms passage gaps (12.13) for the fuel gases. 7. Brenner nach Anspruch 6, dadurch gekennzeichnet, daß der Flammenhalter ein Rohr (11) ist.7. Burner according to claim 6, characterized in that the flame holder is a tube (11). 8. Brenner nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Durchtrittsspalte (12,13) gleiche Abmessungen besitzen.8. Burner according to claim 6 or 7, characterized in that the passage gaps (12, 13) have the same dimensions. 9. Brenner nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß die im wesentlichen ebenen Wandungen (6',7 bzw. 9,10) von Druckverteilungskammer (3) und Brennkammer (4) im Übergangsbereich mit einem Knick (8) aneinander anschließen und daß das Rohr (11) symmetrisch zum Knick (8) angeordnet ist.9. Burner according to one of claims 6 to 8, characterized in that the substantially flat walls (6 ', 7 and 9, 10) of the pressure distribution chamber (3) and combustion chamber (4) in the transition region with a kink (8) to each other connect and that the tube (11) is arranged symmetrically to the bend (8). 10. Brenner nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Länge der Brennkammer (4), - in Strömungsrichtung der Brenngase gesehen -, wenigstens das Dreifache der (über die Länge) konstanten Höhe der Brennkammer (4) beträgt.10. Burner according to one of claims 1 to 9, characterized in that the length of the combustion chamber (4), - seen in the flow direction of the fuel gases - is at least three times the (over the length) constant height of the combustion chamber (4). 11. Brenner nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Druckverteilungskammer (3) Einbauten (14) zur Lenkung und Verteilung der Brenngase aufweist.11. Burner according to one of claims 1 to 10, characterized in that the pressure distribution chamber (3) has internals (14) for directing and distributing the fuel gases. 12. Brenner nach Anspruch 11, dadurch gekennzeichnet, daß die Einbauten von einem Blech (14) gebildet sind, welches sich im wesentlichen quer durch die Druckverteilungskammer (3) erstreckt und mit den Wandungen (6,7) der Druckverteilungskammer (3) Durchtrittsspalte (15,16) bildet.12. Burner according to claim 11, characterized in that the internals are formed by a sheet (14) which extends substantially transversely through the pressure distribution chamber (3) and with the walls (6,7) of the pressure distribution chamber (3) passage gaps ( 15, 16). 13. Brenner nach Anspruch 12, dadurch gekennzeichnet daß das Blech (14) gelocht ist.13. Burner according to claim 12, characterized in that the sheet (14) is perforated. 14. Brenner nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, daß die langen Seitenwandungen (9,10) der Brennkammer (4) Deckungsfalten (20) aufweisen, die sich in Strömungsrichtung der Gase erstrecken.14. Burner according to one of claims 1 to 13, characterized in that the long side walls (9, 10) of the combustion chamber (4) have cover folds (20) which extend in the direction of flow of the gases. 15. Brenner nach Anspruch 14, dadurch gekennzeichnet, daß die Deckungsfalten (20) von abgewinkelten und miteinander verschweißten Enden benachbarter Wandungsabschnitte gebildet sind.15. Burner according to claim 14, characterized in that the cover folds (20) are formed by angled and welded ends of adjacent wall sections.
EP83103764A 1982-04-27 1983-04-19 Burner producing hot gas Expired EP0092768B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83103764T ATE20139T1 (en) 1982-04-27 1983-04-19 BURNER FOR GENERATION OF A HOT GAS FLOW.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3215613 1982-04-27
DE19823215613 DE3215613A1 (en) 1982-04-27 1982-04-27 Burner for production of a hot-gas flow
DE3226615 1982-07-16
DE19823226615 DE3226615A1 (en) 1982-07-16 1982-07-16 BURNER TO GENERATE A HOT GAS FLOW, IN PARTICULAR TO SHRINK PLASTIC FILM

Publications (2)

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EP0092768A1 true EP0092768A1 (en) 1983-11-02
EP0092768B1 EP0092768B1 (en) 1986-05-28

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DE (1) DE3363723D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606491A1 (en) * 1986-11-12 1988-05-13 Stepack IGNITION DEVICE FOR HIGH SPEED BURNER OF COLD NOZZLE TYPE AND BURNER USING SAID DEVICE
CN103994438A (en) * 2014-05-30 2014-08-20 长沙有色冶金设计研究院有限公司 Burner of reverberatory furnace

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2822192A1 (en) * 1978-05-20 1979-11-22 Msk Verpackung Syst Gmbh Manually operated hot-air jet pistol for heat-shrinking plastics films - has piezoelectric igniter coordinated with ergonomically shaped two=part casing and grip
GB2064752A (en) * 1979-12-06 1981-06-17 Assi Can Ab Hot gas generator
DE8030181U1 (en) * 1980-11-12 1981-09-10 Msk - Verpackungs-Systeme Gmbh, 4192 Kalkar Burner for slot nozzle to generate a stream of hot gas

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2645263C2 (en) * 1976-10-07 1984-04-05 Heinz Leo 4180 Goch Gantevoort Heating gas generator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2822192A1 (en) * 1978-05-20 1979-11-22 Msk Verpackung Syst Gmbh Manually operated hot-air jet pistol for heat-shrinking plastics films - has piezoelectric igniter coordinated with ergonomically shaped two=part casing and grip
GB2064752A (en) * 1979-12-06 1981-06-17 Assi Can Ab Hot gas generator
DE8030181U1 (en) * 1980-11-12 1981-09-10 Msk - Verpackungs-Systeme Gmbh, 4192 Kalkar Burner for slot nozzle to generate a stream of hot gas

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606491A1 (en) * 1986-11-12 1988-05-13 Stepack IGNITION DEVICE FOR HIGH SPEED BURNER OF COLD NOZZLE TYPE AND BURNER USING SAID DEVICE
EP0270424A1 (en) * 1986-11-12 1988-06-08 Stepack Ignition device for a high-speed burner with a cold nozzle, and burner using this device
CN103994438A (en) * 2014-05-30 2014-08-20 长沙有色冶金设计研究院有限公司 Burner of reverberatory furnace

Also Published As

Publication number Publication date
EP0092768B1 (en) 1986-05-28
DE3363723D1 (en) 1986-07-03

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