EP0051751A2 - Brûleur comprenant une buse ayant une fente large pour produire un courant de gaz chaud - Google Patents

Brûleur comprenant une buse ayant une fente large pour produire un courant de gaz chaud Download PDF

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Publication number
EP0051751A2
EP0051751A2 EP81108098A EP81108098A EP0051751A2 EP 0051751 A2 EP0051751 A2 EP 0051751A2 EP 81108098 A EP81108098 A EP 81108098A EP 81108098 A EP81108098 A EP 81108098A EP 0051751 A2 EP0051751 A2 EP 0051751A2
Authority
EP
European Patent Office
Prior art keywords
slot die
burner according
bars
burner
combustion 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
EP81108098A
Other languages
German (de)
English (en)
Other versions
EP0051751B1 (fr
EP0051751A3 (en
Inventor
Rainer Wilhelm 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
Application filed by MSK Verpackungs Systeme GmbH filed Critical MSK Verpackungs Systeme GmbH
Priority to AT81108098T priority Critical patent/ATE5917T1/de
Publication of EP0051751A2 publication Critical patent/EP0051751A2/fr
Publication of EP0051751A3 publication Critical patent/EP0051751A3/de
Application granted granted Critical
Publication of EP0051751B1 publication Critical patent/EP0051751B1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00003—Fuel or fuel-air mixtures flow distribution devices upstream of the outlet

Definitions

  • the invention relates to a burner with a slot die for generating a hot gas flow, in particular for shrinking plastic film, with a combustion chamber upstream of the slot die, which has a cross-section tapering in the direction of the slot die and a cross-section opposite the slot die and extending essentially over the length of the slot die Has flame holder, to which the combustion gases are supplied in several partial streams from a pressure distribution chamber.
  • Such burners are needed to shrink plastic films, e.g. in the form of hoods that are pulled onto a stack of goods on a pallet.
  • the shrinking can be done with handheld devices, but also with stationary, automatically working systems.
  • shrinking plastic film it is important that a uniform, flame-free hot gas flow is generated.
  • Burners of the type described in the introduction are known (cf. e.g. DE-GM 18 90 208). With such burners there are always problems with regard to the stability of the flame, which often becomes so large that it emerges from the nozzle. This is especially true when a relatively high heating output is required. This is also associated with disturbing noises.
  • the object of the invention is therefore to improve a burner of the type described in the introduction so that even at high power only a short flame is generated which does not emerge from the slot die. A low level of noise is also sought.
  • the flame holder has a plurality of openings distributed over the outlet surface of the combustion gases and that in the combustion chamber directly on the flame holder two rods extending parallel to the slot die to form a main stream directed towards the slot die and two each at an angle Burner chamber walls of directed side streams are arranged.
  • three combustion gas streams essentially parallel to one another and extending along the slot die, are generated, of which the central one is designed as the main stream, which is directly opposite the slot die and is directed towards the latter.
  • the main stream is, however, the two side streams disturbed, because the secondary flows are directed against the sloping walls of the burner chamber and are deflected by the latter in the direction of the main flow. This creates turbulence, which leads to an intensive swirling of the combustion gases and thus preheating of the main gas flow, with the result that the combustion takes place on a short path between the outlet surface and the slot die, but in any case within the combustion chamber.
  • Such square rods in turn form turbulence-forming interference cells, the turbulence generated by the square rods having a finer structure than the turbulence generated by deflecting the secondary flows on the oblique burner chamber walls.
  • the distance between the rods should be set up in accordance with a ratio of approximately 1: 1 of the volume flows of the main flow and the sum of the secondary flows, because the mixture forced by turbulence then proceeds well.
  • This effect can be further improved in that the height of the rods corresponds at least approximately to the width of the side streams at their point of exit.
  • the exit surface of the combustion gases in the combustion chamber should be substantially flat. Accordingly, the exit surface can be formed by a screen, a perforated plate or preferably by parallel bars spaced apart from one another.
  • the bars can be round bars, according to the preferred embodiment of the invention are aligned transversely to the longitudinal direction of the slot die.
  • the burner 1 shown in the drawing with a slot nozzle 2 is used to generate a hot gas stream from combustion gases. It is used for shrinking plastic film, e.g. of shrink hoods drawn on a pallet stack.
  • the basic structure of the burner 1 has a combustion chamber 3 connected upstream of the slot die 2, which has a cross section which tapers in the direction of the slot die 2, which cross section inclined walls 4, 5 are formed which on the one hand define the slot die 2 between them and which are connected on the other hand to a flame holder 6 opposite the slot die 2 which is arranged at the end of a pressure distribution chamber 7.
  • the pressure distribution chamber 7 has a fan-shaped plan. It is connected to a mixture feed pipe 8 on the side opposite the flame holder 6. Distribution plates 9 are arranged in the pressure distribution chamber 7.
  • the flame holder 6 extends in the illustrated embodiment over the entire length of the slot die 2.
  • the flame holder 6 is formed by a plurality of parallel and spaced grating bars 10, which are aligned transversely to the longitudinal direction of the slot die 2.
  • the bars 10 are made of spring steel with a diameter of approximately 3 mm and the mutual spacing of the bars 10 is approximately 0.5 mm.
  • two square bars 11, 12 are arranged, which are aligned in the longitudinal direction of the slot die 2.
  • the square bars 11, 12 define an average main flow 13 and on both sides thereof a secondary flow 14 or 15 of the combustion gases.
  • the mutual distance between the square bars 11, 12 and their distance from the adjacent walls 4 and 5 is set up so that the volume flows of the main flow 13 and Sum of the secondary flows 14, 15 are essentially the same.
  • the volume flows of the two secondary flows 14, 15 are essentially the same.
  • the two secondary flows 14, 15 are directed towards the inclined walls 4 and 5 of the combustion chamber 3. Accordingly, the secondary flows 14, 15 are deflected by these walls 4 and 5 during operation, namely in the direction of the main flow 13. The deflection creates turbulence which disrupts the main flow. Further turbulence with a smaller structure occurs on the square bars 11, 12, behind which sides 16, 7 directed towards the slot die 2, dead water areas form. As a result, coarse and fine turbulences are generated, which produce an intensive mixing of the combustion gases carried in the main stream 13 or in the secondary streams 14, 15 and thus a short flame which always remains in the combustion chamber 3.
  • the burner shown can be used both as a handheld device and in series with similar burners on an automatically operating system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
EP81108098A 1980-11-12 1981-10-09 Brûleur comprenant une buse ayant une fente large pour produire un courant de gaz chaud Expired EP0051751B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81108098T ATE5917T1 (de) 1980-11-12 1981-10-09 Brenner mit breitschlitzduese zur erzeugung eines heissgasstromes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3042548 1980-11-12
DE19803042548 DE3042548A1 (de) 1980-11-12 1980-11-12 Brenner mit breitschlitzduese zur erzeugung eines heissgasstromes

Publications (3)

Publication Number Publication Date
EP0051751A2 true EP0051751A2 (fr) 1982-05-19
EP0051751A3 EP0051751A3 (en) 1982-09-15
EP0051751B1 EP0051751B1 (fr) 1984-01-18

Family

ID=6116518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108098A Expired EP0051751B1 (fr) 1980-11-12 1981-10-09 Brûleur comprenant une buse ayant une fente large pour produire un courant de gaz chaud

Country Status (3)

Country Link
EP (1) EP0051751B1 (fr)
AT (1) ATE5917T1 (fr)
DE (2) DE3042548A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0486169A3 (en) * 1990-11-16 1992-12-16 American Gas Association Low nox burner
EP3324115A1 (fr) * 2016-11-21 2018-05-23 Pro-Iroda Industries, Inc. Pistolet thermique comportant un système à auto-refroidissement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2645263C2 (de) * 1976-10-07 1984-04-05 Heinz Leo 4180 Goch Gantevoort Heizgaserzeuger
DE2822192A1 (de) * 1978-05-20 1979-11-22 Msk Verpackung Syst Gmbh Handschrumpfgeraet fuer die erzeugung eines heissluftstrahls zum schrumpfen von kunststoffolien o.dgl.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0486169A3 (en) * 1990-11-16 1992-12-16 American Gas Association Low nox burner
EP3324115A1 (fr) * 2016-11-21 2018-05-23 Pro-Iroda Industries, Inc. Pistolet thermique comportant un système à auto-refroidissement
US20180142920A1 (en) * 2016-11-21 2018-05-24 Pro-Iroda Industries, Inc. Heat Gun with Self-Cooling System

Also Published As

Publication number Publication date
DE3042548A1 (de) 1982-10-07
EP0051751B1 (fr) 1984-01-18
ATE5917T1 (de) 1984-02-15
EP0051751A3 (en) 1982-09-15
DE3161981D1 (en) 1984-02-23

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