EP0092768B1 - Burner producing hot gas - Google Patents

Burner producing hot gas 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
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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
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German (de)
French (fr)
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EP0092768A1 (en
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
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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
Expired legal-status Critical Current

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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 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.

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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)

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, der mit der Brennkammer einen Strömungskanal mit gleichen und in Strömungsrichtung konstanten Querschnitten bildet.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.

Derartige Brenner benötigt man zum Einschrumpfen von Kunststoffolien, z. B. 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 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. When shrinking plastic film, it is important that a uniform, flame-free hot gas flow is generated.

Ein Brenner der eingangs beschriebenen Gattung ist bekannt (DE-A-2645263). Dieser Brenner besitzt eine rohrförmige Brennkammer mit seitlichen Schlitzen zum Ansaugen der Verbrennungsluft. Die angesaugte Verbrennungsluft erzeugt zwar Turbulenzen in der Brennkammer, die zu einer intensiven Verwirbelung der Verbrennungsgase und damit zu einer Verbrennung auf kurzem Wege führen, der Heißgasstrom tritt aber mit erheblicher Geschwindigkeit aus dem Auslaß der Brennkammer aus. Diese hohe Austrittsgeschwindigkeit ist unerwünscht, wenn Kunststoffolie geschrumpft werden soll. Andererseits ist aber auch eine vollständige Verbrennung der Gase erwünscht, die nur dann erreicht werden kann, wenn die Gase gut durchmischt sind.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. On the other hand, complete combustion of the gases is also desirable, which can only be achieved if the gases are mixed well.

Ein weiterer Brenner ist aus der DE-U-8 030 181 bekannt. 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.Another burner is known from DE-U-8 030 181. In this burner, 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. 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 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.

Der Erfindung liegt deswegen die Aufgabe zugrunde, einerseits eine gute Durchmischung der Verbrennungsgase im Hinblick auf vollständige Verbrennung zu erreichen und andererseits die Austrittsgeschwindigkeit des Heißgasstromes zu reduzieren.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.

Diese Aufgabe wird dadurch gelöst, daß die Druckverteilungskammer einen fächerförmigen Grundriß aufweist und auf der dem Flammenhalter gegenüberliegenden, kurzen Seite an ein Gemischzuführungsrohr sowie auf ihrer breiten Seite an die Brennkammer anschließt, die einen langgestreckten, rechteckigen Grundriß besitzt.This object is achieved in that 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.

Bei diesem Brenner wird die Druckverteilungskammer zu 'einer Wirbelkammer, in der die Verbrennungsgase nicht nur genügend Zeit, sondern auch eine genügend große Wegstrekke für eine intensive Verwirbelung zur Verfügung haben. Nach Durchtritt durch den Flammenhalter und Eintritt in die Brennkammer kann dann die Verbrennung ablaufen, wobei der Heißgasstrom den Auslaß mit mäßiger Geschwindigkeit verläßt. Die Geschwindigkeit des Heißgasstroms läßt sich durch Gestaltung der Druckverteilungskammer und der nachgeschalteten Brennkammer bzw. durch die Querschnitte der so gebildeten Strömungskanäle beeinflussen. Praktisch läßt sich auf diese Weise zwischen Gemischzuführungsrohr und Auslaß ein Strömungskanal mit konstantem Querschnitt verwirklichen, bei dem die Änderung der Querschnittsformen zu der gewünschten intensiven Verwirbelung der Verbrennungsgase führt.With this burner, 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. After passing through the flame holder and entering the combustion chamber, 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. In practice, 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.

Es genügt, wenn die Höhe 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 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.

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, der vorzugsweise von einem Gitter aus zueinander parallelen Stäben gebildet ist, einen erheblichen Strömungswiderstand bildet, bewirkt er gleichzeitig auch eine Verteilung der aus der Druckverteilungskammer 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, 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. 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, 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.

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 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.

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 seen in the flow direction of the combustion gases, should be at least three times the height of the combustion chamber which is constant over the length.

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 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.

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 in der Zeichnung dargestellte Ausführungsbeispiele der Erfindung erläutert ; es zeigen :

  • Figur 1 einen Längsschnitt durch einen Brenner,
  • Figur 2 einen Schnitt in Richtung 11-11 durch den Gegenstand nach Fig. 1,
  • Figur 3 einen Schnitt in Richtung 111-111 durch den Gegenstand nach Fig. 1,
  • Figur 4 eine Draufsicht auf einen anderen Brenner,
  • Figur 5 einen Schnitt in Richtung V-V durch den Gegenstand nach Fig. 4,
  • Figur 6 eine Ansicht mit Teilschnitt in Richtung VI-VI nach Fig. 4.
Exemplary embodiments of the invention illustrated in the drawing are explained below; show it :
  • FIG. 1 shows a longitudinal section through a burner,
  • FIG. 2 shows a section in the direction 11-11 through the object according to FIG. 1,
  • FIG. 3 shows a section in the direction 111-111 through the object according to FIG. 1,
  • FIG. 4 shows a top view of another burner,
  • FIG. 5 shows a section in the direction VV through the object according to FIG. 4,
  • FIG. 6 shows a view with partial section in the direction VI-VI according to FIG. 4.

Der in der Zeichnung dargestellte Brenner 1 dient zur Erzeugung eines Heißgasstromes aus Verbrennungsgasen. Er wird 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. B. 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 ist 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 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.

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. 3 mm bestehen, und der gegenseitige Abstand der Gitterstäbe 9 kann dabei etwa 0,5 mm 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 3 mm, and the mutual spacing of the bars 9 can be about 0.5 mm.

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 to form a diffuser and 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 t5 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) connects. 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 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.

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 region 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 has 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 117° 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 Brennkammer 34 eintreten. Nicht dargestellt ist, daß das Blech 14 zusätzlich noch gelocht sein kann.To improve the pressure distribution of the fuel gases when entering the combustion chamber 34, 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, as shown, 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.

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 (14)

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.
2. A burner according to Claim 1, characterized in that the height of the combustion chamber (3) with the outlet (2) in the direction of flow amounts to between 1.2 and 1.5 times the width of the combustion chamber (3).
3. A burner according to Claim 1 or 2, characterized in that the end portions (10, 11) of the walls (4, 5) defining the outlet (2) are flared to form a diffusor.
4. A burner according to any one of Claims 1 to 3, characterized in that the flame retention baffle (6) is formed by a grid of rods (9) parallel to one another.
5. A burner according to any one of Claims 1 to 3, characterized in that the flame retention baffle (41) is a profiled rod which extends over the entire width of the pressure-distribution chamber (33) or combustion chamber (34) and with the adjacent walls (36, 37 and 39, 40 respectively) forms throughflow gaps (12, 13) for the combustion gases.
6. A burner according to Claim 5, characterized in that the flame retention baffle is a pipe (41).
7. A burner according to Claim 5 or 6, characterized in that the throughflow gaps (12, 13) have the same dimensions.
8. A burner according to Claim 6 or 7, characterized in that the essentially flat walls (36, 37 and 39, 40 respectively) of the pressure-distribution cbamber (33) and combustion chamber (34) adjoin one another with a bend (38) in the transition area, and the pipe (41) is arranged symmetrically to the bend (38).
9. A burner according to any one of Claims 1 to 8, characterized in that the length of the combustion chamber (34) - as viewed in the direction of flow of the combustion gases - 'N.B. Literal translation of German Brenner-. Presumably combustion chamber - (Brennkammer) is meant, as also indicated by the following reference numerals. It should be noted parenthetically that the degree of inconsistency in the use of the numerals otherwise in the claims is somewhat startling. amounts to at least three times the height of the combustion chamber (34) which is constant over the length.
10. A burner according to any one of Claims 1 to 9, characterized in that the pressure-distribution chamber (33) comprises attachments (14) for deflecting and distributing the combustion gases.
11. A burner according to Claim 10, characterized in that the attachments are formed by a metal sheet (14) which extends essentially transversely through the pressure-distribution chamber (33) and with the walls (36, 37) of the pressure-distribution chamber (33) forms throughflow gaps (15, 16).
12. A burner according to Claim 11, characterized in that the metal sheet (14) is perforated.
13. A burner according to any one of Claims 1 to 12, characterized in that the long side walls (39, 40) of the combustion chamber (34) comprise expansion folds (20) which extend in the direction of flow of the gases.
14. A burner according to Claim 13, characterized in that the expansion folds (20) are formed by angled ends - welded together - of adjacent wall portions.
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)

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

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EP83103764A Expired EP0092768B1 (en) 1982-04-27 1983-04-19 Burner producing hot gas

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EP (1) EP0092768B1 (en)
DE (1) DE3363723D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2606491B1 (en) * 1986-11-12 1989-03-03 Stepack IGNITION DEVICE FOR HIGH SPEED BURNER OF COLD NOZZLE TYPE AND BURNER USING THE SAME
CN103994438B (en) * 2014-05-30 2016-02-10 长沙有色冶金设计研究院有限公司 A kind of reverberatory furnace burner

Citations (1)

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

Family Cites Families (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
SE7910048L (en) * 1979-12-06 1981-06-07 Assi Can Ab DEVICE TO SUPPLY A GAS FLOW TO A WELL-DEFINED AREA
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

Patent Citations (1)

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

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

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