EP0972163B1 - Flammen-zünder - Google Patents

Flammen-zünder Download PDF

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Publication number
EP0972163B1
EP0972163B1 EP98908335A EP98908335A EP0972163B1 EP 0972163 B1 EP0972163 B1 EP 0972163B1 EP 98908335 A EP98908335 A EP 98908335A EP 98908335 A EP98908335 A EP 98908335A EP 0972163 B1 EP0972163 B1 EP 0972163B1
Authority
EP
European Patent Office
Prior art keywords
flame
electrode
igniter
flame igniter
forward end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98908335A
Other languages
English (en)
French (fr)
Other versions
EP0972163A1 (de
Inventor
Carl Henrick MÜLLER
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.)
Smitsvonk Holland BV
Original Assignee
Smitsvonk Holland BV
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Filing date
Publication date
Application filed by Smitsvonk Holland BV filed Critical Smitsvonk Holland BV
Publication of EP0972163A1 publication Critical patent/EP0972163A1/de
Application granted granted Critical
Publication of EP0972163B1 publication Critical patent/EP0972163B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q3/00—Igniters using electrically-produced sparks
    • F23Q3/008—Structurally associated with fluid-fuel burners

Definitions

  • the present invention relates to a flame igniter with sliding spark discharge.
  • a high-powered external sliding spark ignition occurs in the spark-gap on the external surface of the flame igniter, between the two electrodes, the spark passing over the exposed, external part of the surface of the insulator thus igniting the combustion air-combustion gas mixture passing around the flame igniter, in which an ignition gas, hereafter called the flame gas, is contained for obtaining a correct ignition.
  • the spark discharge of the high-powered type is generated by an ignition system containing a capacitor, which is charged to a voltage that is sufficient to cause the spark ignition.
  • a further disadvantage is that the diameters of suchlike flame igniters, especially when used as industrial gas igniters for high output, are relatively large and that for various combustion air - combustion gas mixtures different igniters are needed.
  • the invention provides a flame igniter comprising the features of claim 1.
  • the invention is based on the insight that the problems with known flame igniters with external sliding spark discharge occur substantially because the sliding spark ignition should ignite the combustion air - combustion gas mixture flowing past the igniter.
  • the flame gas to be ignited can be partially or entirely led through this passage and flow to the spark-gap.
  • This flame gas portion can apparently be reproducibly ignited in a simple manner at a low output by the sliding spark discharge whilst forming a primary flame. Because of the relatively low output used, the electrode erosion is also relatively low, thus extending the life-span of the flame igniter.
  • the primary flame is mixed with air from the combustion air - combustion gas mixture which flows past the flame igniter, so that a stable combustion occurs.
  • the external sliding spark can reliably ignite the primary flame under extremely changeable gas/air conditions, as the sliding spark ignition always takes place on the boundary surface of flame gas and combustion air - combustion gas mixture.
  • inventive flame igniter with external sliding spark discharge it is not necessary to mix the flame gas and the combustion air - combustion gas mixture before leading it to or about the flame igniter.
  • EP-A-0.093.642 discloses a flame igniter having an outer electrode completely surrounding an insulator and a central, inner electrode.
  • the passage is arranged in the metal housing.
  • the passage is a through-going longitudinal central bore arranged in the first electrode, in which a backward end of the first electrode is connectable to the flame gas source.
  • the flame igniter with external sliding spark discharge is characterized in that the first electrode is provided with a through-going longitudinal central bore, and that the forward end of the first electrode is provided with at least one throughgoing radial auxiliary bore which discharges on the one hand in the central bore and on the other hand near the spark-gap, in which a backward end of the first electrode is connectable to the flame gas source.
  • a portion of the flame gas carried in the central bore flows via the auxiliary bore to the spark-gap.
  • This flame gas portion can be reproducibly ignited in a simple manner at a relatively low output by the external sliding spark discharge whilst forming a primary flame.
  • the primary flame is mixed with air from the combustion air - combustion gas mixture which flows past the flame igniter, as a result of which a stable combustion occurs, ensuring a reproducible ignition of the main flame gas flow emitting from the central bore.
  • the required combustion air is drawn in by the main flame gas flow, which creates underpressure on account of high exit speed. Because the main flame gas stream draws in the combustion air, the nozzle can be described as self-priming.
  • the flame gas portion flowing through the auxiliary bore is controllable in that the forward end of the central bore is internally provided with a thread, which extends from the forward end to beyond the exit of the auxiliary bore, and that a nozzle is screwed into the forward end of the central bore.
  • a flame igniter with external sliding spark discharge for igniting a combustion air - combustion gas mixture passing along an external surface of the flame igniter via an external sliding spark is shown in cross section and placed in a housing tube 15.
  • the flame igniter contains a first central electrode 1 with a forward end 4 that has an external surface forming part of the external surface of the flame igniter.
  • An insulator 3, or an assembly of insulators, which coaxially surrounds the central electrode 1, has an exposed external surface 31 that is part of the external surface of the flame igniter.
  • a metal housing 6 coaxially surrounds the insulator 3, or the assembly of insulators, a forward end of the housing 6 having an external surface that forms a second electrode 2 and a part of the external surface of the flame igniter.
  • This second electrode 2 is spaced from a forward end 4 of the first electrode 1 for defining a spark-gap 5, where the external surface of the insulator 3 is exposed.
  • the central electrode 1 is for instance provided with a through-going longitudinal bore 7.
  • the forward end 4 of the first electrode 1 is preferably provided with at least one through-going radial auxiliary bore 8.
  • This auxiliary bore 8 discharges on the one hand in central bore 7 and on the other hand near spark-gap 5.
  • a backward end 9 of the first electrode 1 is connectable to a flame gas source, so that flame gas 12 can flow through the central bore 7 and the auxiliary bore 8 through the flame igniter.
  • the flame gas portion that flows out through the auxiliary bore 8 near the spark-gap 5 is ignited by the sliding spark discharge and thus forms a primary flame, which is located approximately in the area 13.
  • a combustion air current 11 (possibly but not necessarily containing a gas mixture which can differ from the flame gas) is led through the casing tube 15 in which the flame igniter is positioned, this current flowing past and around the flame igniter, whereby the primary flame is mixed with air.
  • the combustion air is drawn in by the main flame gas flow that flows at high speed out of the forward end 10, thus creating an underpressure. In this way a stable combustion of the primary flame is obtained, which reproducibly ignites the main flame gas portion flowing out of the forward end 10 of the central bore 7, whilst forming a main flame which is located approximately in the area 14.
  • the inventive flame igniter also appears to provide a relatively large ignition capacity and is applicable in various densities, differing pressures and different combustion air - combustion gas mixtures and kinds of flame gas, without the structure having to be adapted.
  • the number of auxiliary bores 8, their diameter, and the diameter of the central bore can be determined and adjusted to one another with the help of simple experiments so that a specified ratio of flame gas flowing through the auxiliary bores 8 and from the forward end 10 is obtained, providing a flame igniter with a specified capacity or with a particular igniting characteristic.
  • the flame gas portion flowing through the auxiliary bore 8 is adjustable by providing the forward end 10 of the central bore 7 with an internal thread which extends to beyond the exit of the auxiliary bore 8.
  • the length of the path which the flame gas has to cover through the thread in order to reach into the auxiliary bore 8 is adjusted, thus providing control of the quantity of flame gas flowing into the auxiliary bore. Because the main flame gas flow draws in the combustion air - combustion gas mixture, the nozzle can be described as self-priming.
  • the flame gas supply is integrated in the flame igniter, thus forming a reproducible ignition. It is therefore not necessary to mix flame gas with the combustion air combustion gas mixture prior to leading the latter along the flame igniter.
  • combustion air - combustion gas mixture is first of all mixed with a flame gas in flame igniters with internal spark discharge, after which this mixture is added to the internal spark discharge. This prior mixing requires a considerably more complex flame igniter structure.
  • the inventive igniter can, among other things, be applied in lighting and pilot burners and industrial gas igniters with a capacity of 5 to 500 kW. Should a larger capacity be desired, a further gas can be introduced directly into the main flame. With smaller capacities, smaller that 50 kw, the main flame gas flow and the primary flame gas flow can be combined, it being possible to arrange a passage which discharges near the spark-gap into the metal housing or in the first electrode, which passage is connectable to a flame gas source.
  • Other embodiments, in which the flame gas supply is integrated in another way in the flame igniter have the same advantages, as long as at least part of the flame gas is led past the sliding spark-gap.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spark Plugs (AREA)
  • Glass Compositions (AREA)
  • Fuses (AREA)
  • Air Bags (AREA)

Claims (5)

  1. Flammenzünder mit Gleitfunkenentladung zum Zünden einer via einen Außengleitfunke entlang einer Außenoberfläche des Flammenzünders passierenden Verbrennungsluft- Verbrennungsgasmischung, umfassend eine erste zentrale Elektrode (1) mit einem Vorwärtsende (4) mit einer zu der Außenoberfläche des Flammenzünders gehörenden Außenoberfläche, einen die zentrale Elektrode (1) coaxial umgebenden Insulator (3) oder ein die zentrale Elektrode (1) coaxial umgebendes System von Insulatoren, mit einer zu der Außenoberfläche des Flammenzünders gehörenden freiliegenden Außenoberfläche (31) und ein den Insulator (3) oder das System von Insulatoren coaxial umgegebendes Metallgehäuse (6), worin ein Vorwärtsende des Gehäuses (6) eine Außenoberfläche hat, die eine zweite Elektrode (2) und ein Teil der Außenoberfläche des Flammenzünders bildet, welche zweite Elektrode (2) auf Abstand von dem Vorwärtsende (4) der ersten Elektrode (1) gelegen ist um eine Funkenstrecke (5) zu bestimmen, wo die Außenoberfläche des Insulators (3) oder des Systems von Insulatoren freiliegt, worin der Flammenzünder mit einem mit der Flammengasquelle zu verbindenden Durchgang (7, 8) versehen ist, welcher Durchgang (7, 8) nahe der Funkenstrecke (5) ausmündet.
  2. Flammenzünder nach Anspruch 1, dadurch gekennzeichnet, daß der Durchgang (7, 8) in dem Metallgehäuse (6) angeordnet ist.
  3. Flammenzünder nach Anspruch 1, dadurch gekennzeichnet, daß der Durchgang (7, 8) eine in der ersten Elektrode (1) angeordnete durchgehende longitudinale zentrale Bohrung (7) ist, wobei ein Rückwärtsende (9) der ersten Elektrode (1) mit einer Flammengasquelle zu verbinden ist.
  4. Flammenzünder nach Anspruch 1, dadurch gekennzeichnet, daß die erste Elektrode (1) mit einer durchgehenden longitudinalen zentralen Bohrung (7) versehen ist, und daß das Vorwärtsende (4) der ersten Elektrode (1) mit zumindest einer durchgehenden radialen Hilfsbohrung (8), die einerseits in der zentralen Bohrung (7) und anderseits nahe der Funkenstrecke (5) ausmündet, versehen ist, wobei ein Rückwärtsende (9) der ersten Elektrode (1) mit einer Flammengasquelle zu verbinden ist.
  5. Flammenzünder nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß das Vorwärtsende (10) der zentralen Bohrung (7) inwendig mit einem Gewinde versehen ist, das sich von dem Vorwärtsende (10) bis an der Ausmündung der Hilfsbohrung (8) vorbei erstreckt und daß eine Düse in dem Vorwärtsende (10) der zentralen Bohrung (7) geschraubt ist.
EP98908335A 1997-04-04 1998-03-06 Flammen-zünder Expired - Lifetime EP0972163B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1005736A NL1005736C2 (nl) 1997-04-04 1997-04-04 Vlamontsteker.
NL1005736 1997-04-04
PCT/NL1998/000135 WO1998045649A1 (en) 1997-04-04 1998-03-06 Flame igniter

Publications (2)

Publication Number Publication Date
EP0972163A1 EP0972163A1 (de) 2000-01-19
EP0972163B1 true EP0972163B1 (de) 2002-10-30

Family

ID=19764735

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98908335A Expired - Lifetime EP0972163B1 (de) 1997-04-04 1998-03-06 Flammen-zünder

Country Status (7)

Country Link
EP (1) EP0972163B1 (de)
AT (1) ATE227014T1 (de)
AU (1) AU6639398A (de)
DE (1) DE69809037T2 (de)
ES (1) ES2186131T3 (de)
NL (1) NL1005736C2 (de)
WO (1) WO1998045649A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2941286B1 (fr) 2009-01-16 2012-08-31 Air Liquide Bruleur pilote air-gaz pouvant fonctionner a l'oxygene.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312834A (en) * 1942-01-12 1943-03-02 Ind Res Lab Ltd Gas pilot burner
FR1343579A (fr) * 1962-09-04 1963-11-22 Harris Calorific Co Chalumeau à allumoir
FR1352435A (fr) * 1963-03-28 1964-02-14 Clevite Corp Chalumeau à gaz à allumage incorporé
JPS58165419U (ja) * 1982-04-26 1983-11-04 テイサン株式会社 スパ−ク着火式火口

Also Published As

Publication number Publication date
ATE227014T1 (de) 2002-11-15
DE69809037T2 (de) 2005-09-22
WO1998045649A1 (en) 1998-10-15
AU6639398A (en) 1998-10-30
ES2186131T3 (es) 2003-05-01
DE69809037D1 (de) 2002-12-05
EP0972163A1 (de) 2000-01-19
NL1005736C2 (nl) 1998-10-07

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