EP0331795A1 - Burner operated by the exhaust gas of an internal combustion engine - Google Patents

Burner operated by the exhaust gas of an internal combustion engine Download PDF

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Publication number
EP0331795A1
EP0331795A1 EP88118085A EP88118085A EP0331795A1 EP 0331795 A1 EP0331795 A1 EP 0331795A1 EP 88118085 A EP88118085 A EP 88118085A EP 88118085 A EP88118085 A EP 88118085A EP 0331795 A1 EP0331795 A1 EP 0331795A1
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EP
European Patent Office
Prior art keywords
burner
combustion chamber
bluff body
burner according
combustion engine
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Granted
Application number
EP88118085A
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German (de)
French (fr)
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EP0331795B1 (en
Inventor
Rainer Kolodzie
Dieter Dr. Görlich
Roland Fiola
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Webasto SE
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Webasto SE
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Publication of EP0331795A1 publication Critical patent/EP0331795A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a burner for difficult to ignite gas mixtures, in particular for exhaust gases from an internal combustion engine, with a combustion chamber, an ignition device and a fuel injection nozzle.
  • flame-resistant gas mixtures is understood to mean those which contain little oxygen or which are fuels which are difficult to burn. In a main application example of such a burner, this is used to generate hot combustion gases, which are used, for example, to initiate the regeneration of a particle filter system in the exhaust tract of a diesel internal combustion engine.
  • DE-OS 35 26 074 describes a device for removing combustible solid particles from exhaust gases from internal combustion engines, in which an ignition burner is provided which is connected to a combustion chamber via an overflow opening, additional air and fuel being supplied to the ignition burner.
  • a partial exhaust gas stream enriched with the solid particles is introduced into the combustion chamber via a first immersion tube, and after the solid particles have burned off, it is discharged together with the remaining combustion products together with the remaining combustion products as purified exhaust gas via a second immersion tube.
  • the combustible solid particles of the exhaust gas are thus burned directly for exhaust gas purification purposes in the combustion chamber.
  • a reference to the use of this device in connection with the regeneration of soot filter systems is not described there, but this device represents an alternative to the use of particle filter systems in the exhaust gas area of a diesel internal combustion engine, for example.
  • the invention aims to provide a burner for difficult to ignite gas mixtures of the generic type, which can be reliably ignited even with a great lack of oxygen or a low 02 content in the exhaust gas and the flame in the burner can be kept stable.
  • a burner for difficult to ignite gas mixtures in particular for exhaust gases from a diesel Internal combustion engine, with a combustion chamber, an ignition device and a fuel injector, characterized in that a bluff body, which extends approximately perpendicular to the central axis of the fuel injector, is arranged at a distance from the mouth opening thereof measured in the jet direction of the fuel injector.
  • the bluff body divides the combustion chamber in its axial direction so that an oxygen-enriched zone is formed in the area between the bluff body and the mouth opening of the fuel injector, which is energy-rich and has a high heat flux density.
  • a stable pilot flame can be generated in this zone, by means of which the flame-retardant gas mixture can then be ignited in the combustion chamber of the burner.
  • part of the fuel emitted by the fuel injection nozzle hits the bluff body, which lies in such an area of the combustion chamber that it becomes glowing.
  • the bluff body in the burner according to the invention thus simultaneously ensures that the flame in the combustion chamber is stably maintained regardless of the amounts and the oxygen content of the exhaust gas.
  • the bluff body also causes a swirl to be generated downstream thereof, whereby the mixing of the gases in the combustion chamber downstream of the bluff body with the fuel is intensified. This makes the firing conditions cheaper achieved in the combustion chamber as a whole.
  • the bluff body is preferably designed as a baffle plate and expediently arranged coaxially to the axis of the fuel nozzle in such a way that an annular space is present between the wall of the combustion chamber and the outside of the baffle plate, through which the fuel emitted by the fuel nozzle reaches the region of the combustion chamber located downstream of the baffle plate can.
  • the bluff body can be formed by a perforated disc which has a central opening and which is attached to the wall of the combustion chamber.
  • the fuel from the fuel injection nozzle enters through the central opening of the perforated disk into the region of the burner combustion chamber located downstream of the perforated disk.
  • the bluff body can also be formed by a reduced-diameter area of the combustion chamber, such as a constriction, so that no additional components, such as a baffle plate or a perforated disk, need be provided in the combustion chamber.
  • Another preferred embodiment of the burner according to the invention is characterized in that when the burner is operated with exhaust gas from the diesel engine, combustion air, i.e. Fresh air or additional air is introduced at least into the area between the bluff body and the fuel injector, so that a pilot flame can be quickly and reliably generated in the area between the fuel nozzle and the bluff body in the ignition phase of the burner.
  • combustion air i.e. Fresh air or additional air is introduced at least into the area between the bluff body and the fuel injector, so that a pilot flame can be quickly and reliably generated in the area between the fuel nozzle and the bluff body in the ignition phase of the burner.
  • the exhaust gas when the burner is operated with exhaust gas from the diesel engine, the exhaust gas is introduced into the combustion chamber at a point which is close to the end of the combustion chamber facing away from the fuel injector. This ensures that the exhaust gas coming from the internal combustion engine does not reach the area between the fuel injector and the bluff body so as not to adversely affect the treatment of an extremely ignitable gas mixture in this area by the exhaust gases of the internal combustion engine.
  • the burner can function significantly better if the bluff body is designed, for example, as a cone, ball or spherical shell which approximates a cone.
  • a burner is generally designated 1.
  • the burner 1 has a combustion chamber 2, at one end of which a fuel injection nozzle 3 is provided for supplying fuel.
  • the arrow at the end of the combustion chamber 2 opposite the fuel injection nozzle 3 indicates the hot combustion gas stream emerging from the combustion chamber 2, which in the preferred application form according to the invention is fed to a particle filter system in the exhaust tract of a diesel engine, for example, so that the particulate filter or particulates, such as soot filters, can be regenerated after clogging, whereby the combustion of the soot particles in the soot filter can be initiated with the hot combustion gases from the combustion chamber 2.
  • the nozzle jet emitted from the orifice 4 of the fuel injection nozzle 3 is entered in broken lines.
  • a baffle body is arranged at a distance from the mouth opening 4 of the fuel injection nozzle 3, which baffle is formed in the embodiment according to FIGS. 1 and 2 by a baffle plate 6, which according to FIG the wall 8 of the combustion chamber 2 is attached.
  • Oxygen-rich air such as fresh air or additional air, preferably enters the combustion chamber 2 via the opening indicated schematically by 9.
  • an inlet 10 is shown, through which exhaust gases coming from the internal combustion engine, for example, are introduced into the combustion chamber 2 will.
  • an ignition device is shown schematically in the figures of the drawing and provided with the reference number 11.
  • the bluff body 5 divides the combustion chamber 2 into a first zone 2a lying between the fuel injection nozzle 3 and the bluff body 5 and a second zone 2b lying downstream of the bluff body 5.
  • the burner 1 an extremely ignitable mixture of fuel and combustion air is prepared in the first zone 2a around the fuel injector 3, optionally with the supply of additional air through the opening 9, a portion of the fuel emitted by the fuel injector 3 striking the bluff body 5.
  • the mixture thus prepared is ignited in the first zone 2a of the combustion chamber 2 and a pilot flame is formed in this first zone 2a.
  • This pilot flame heats the bluff body 5, which is designed as a baffle plate 6 according to FIGS.
  • This gas mixture in the second zone 2b of the combustion chamber 2 contains as main fuel the exhaust gases of the internal combustion engine introduced via the inlet 10, their oxygen content and their quantity as well as the flow rate can change greatly depending on the operating conditions of the internal combustion engine.
  • the bluff body 5 also supports the mixing of fuel and gas in the zone 2b of the combustion chamber 2, since the bluff body 5 creates a swirl of the gas mixture.
  • the bluff body 5 starts to glow, and the heat radiated from the glowing bluff body 5 increases the flame re-ignition speed in the region of the flame root due to the position of the bluff body 5, so that a stable flame is maintained in the combustion chamber 2.
  • the inventive design effectively prevents the flame in the combustion chamber 2 from being broken off and thereby the flame from extinguishing.
  • a type of pilot flame can thus be reliably generated in the first zone 2a of the combustion chamber 2 by the support of the bluff body 5 when the combustion operation is initiated, so that the flame-resistant gas mixture in the second zone 2b of the combustion chamber 2 even under extremely adverse conditions can be made to burn.
  • a stable flame is maintained in the combustion chamber 2 with the aid of the bluff body 5 even in the case of unfavorable burning conditions in the second zone 2b of the combustion chamber 2.
  • the burner 1 according to FIG. 3 has a perforated disk 14 as the baffle 5a, which is in one on the wall 8 of the combustion chamber 2 Distance from the fuel injector 3 is attached.
  • the perforated disk 14 has approximately in the axial extension of the mouth opening 4 of the fuel injection nozzle 3 at least one central opening 15 through which fuel can pass from the fuel injection nozzle 3 into the second zone 2b of the combustion chamber 2.
  • the other part of the fuel emitted by the fuel injection nozzle 3 strikes the disk-shaped part of the perforated disk 14, so that the bluff body 5a in the form of the perforated disk 14 has the essentially same effects as the bluff body 5 in the form of the baffle disk 6 according to FIG. 1 and 2 leads.
  • a bluff body 5b is provided which reduces the free passage cross section of the combustion chamber 2.
  • the bluff body 5b is designed in the form of a constriction of the combustion chamber 2.
  • This bluff body 5b in the form of a constriction 16 essentially achieves the same effects as previously in connection with the embodiment according to FIGS. 1 and 2.
  • the invention is not limited to the present example, but numerous changes and modifications are possible, which the person skilled in the art will make if necessary, without departing from the inventive concept.
  • combinations of the above-described embodiments of the bluff body 5, 5a, 5b can also be provided, or two or more bluff bodies 5, 5a, 5b can be arranged one behind the other, for example at a distance from one another, as seen in the flow direction.
  • the effect of the bluff body 5, 5a, 5b can also be achieved by a corresponding design of the inner wall 8 of the combustion chamber 2 and / or a corresponding arrangement of the fuel injection nozzle 3.
  • the fuel injector 3 is not coaxial in deviation from the examples shown the combustion chamber 2 is provided, but can for example be arranged offset or inclined.
  • the baffle plate 6 can be replaced by a baffle cone 5 'or a spherical shell-shaped baffle 5 ⁇ .
  • a bluff body 5 could also be chosen as a bluff body 5.

Abstract

The invention discloses a burner for slowly ignitable gas mixtures, in particular for exhaust gases of an internal-combustion engine, which is primarily intended for the regeneration of particle-filter systems in the exhaust duct of an internal-combustion engine, in particular a diesel internal-combustion engine. To initiate regeneration of such a system, commonly termed a diesel filter system, the engine produces hot combustion gases at the outlet. At a distance from the outlet opening (4) of a fuel injection nozzle (3), the burner has a baffle (5) which extends approximately perpendicular to the centre line of the fuel injection nozzle (3). This baffle (5) divides the combustion chamber (2) into a high-energy zone (2a) with a gas mixture prepared in such a way that it is readily ignitable and into a second zone (2b), in which the exhaust gas from the internal- combustion engine, diverted into the combustion chamber, is fed to the burner. In this way, the burner can burn even slowly ignitable gas mixtures and a flame for producing hot combustion gases can be maintained reliably and in a stable manner in the combustion chamber irrespective of the operating conditions of the internal-combustion engine. <IMAGE>

Description

Die Erfindung befaßt sich mit einem Brenner für schwer-ent­zündbare Gasgemische, insbesondere für Abgase einer Brennkraftmaschine, mit einer Brennkammer, einer Zündein­richtung und einer Brennstoffeinspritzdüse.The invention relates to a burner for difficult to ignite gas mixtures, in particular for exhaust gases from an internal combustion engine, with a combustion chamber, an ignition device and a fuel injection nozzle.

Unter dem Begriff "schwer-entzündbare Gasgemische" sind bei der Erfindung solche zu verstehen, die wenig Sauerstoff enthalten, oder bei denen es sich um schwierig zu verbren­nende Brennstoffe handelt. Bei einem Hauptanwendungsbeispiel eines solchen Brenners wird dieser dazu benutzt, heiße Ver­brennungsgase zu erzeugen, die zur Einleitung der Regene­rierung einer Partikel-Filteranlage im Abgastrakt einer Diesel-Brennkraftmaschine beispielsweise verwendet werden.In the invention, the term “flame-resistant gas mixtures” is understood to mean those which contain little oxygen or which are fuels which are difficult to burn. In a main application example of such a burner, this is used to generate hot combustion gases, which are used, for example, to initiate the regeneration of a particle filter system in the exhaust tract of a diesel internal combustion engine.

In der älteren Anmeldung derselben Anmelderin (P 37 28 712.5) ist ein derartiger Abgasbrenner beschrieben, bei dem ein Zünd-Hilfsbrenner vorgesehen ist, der mit Druckluft ver­sorgbar ist. Gemäß einer anderen dort beschriebenen Ausbil­dungsform weist der Brenner eine zusätzliche Lufteinblasein­richtung in Höhe der Brennstoffdüse auf. Mit diesen Maßnahmen soll insbesondere beim Anwendungsbeispiel zur Regenerierung einer Abgasfilteranlage erreicht werden, daß die Regenerie­rung der Filteranlage unabhängig vom Sauerstoffanteil im Abgas vorgenommen werden kann. Hierbei wird im Bereich um die Zündeinrichtung ein äußerst zündwilliges Gemisch aufbe­reitet, um eine Zündung des Brenners auch dann bewirken zu können, wenn der Sauerstoffgehalt des Abgases gering ist. Dieser Sauerstoffgehalt des Abgases ist bekanntlich großen Schwankungen unterworfen, die insbesondere vom momentanen Betriebspunkt im Motorkennlinienfeld der Diesel-Brennkraft­maschine in Fahrzeugen abhängig sind. Dieser Restsauerstoff­gehalt im Abgas kann zwischen etwa 20% und etwa 4% liegen.In the earlier application by the same applicant (P 37 28 712.5), such an exhaust gas burner is described in which an auxiliary ignition burner is provided which can be supplied with compressed air. According to another embodiment described there, the burner has an additional air injection device at the level of the fuel nozzle. These measures, in particular in the application example for the regeneration of an exhaust gas filter system, are intended to ensure that the filter system can be regenerated independently of the oxygen content in the exhaust gas. In this case, an extremely ignitable mixture is prepared in the area around the ignition device in order to then also ignite the burner can if the oxygen content of the exhaust gas is low. As is known, this oxygen content of the exhaust gas is subject to large fluctuations, which are particularly dependent on the current operating point in the engine characteristic field of the diesel engine in vehicles. This residual oxygen content in the exhaust gas can be between about 20% and about 4%.

In DE-OS 35 26 074 ist eine Einrichtung zur Entfernung von brennbaren Festkörperteilchen aus Abgasen von Brennkraftma­schinen beschrieben, bei der ein Zündbrenner vorgesehen ist, der über eine Überströmöffnung mit einer Brennkammer ver­bunden ist, wobei dem Zündbrenner Zusatzluft und Kraftstoff zugeführt werden. In die Brennkammer wird über ein erstes Tauchrohr ein mit den Festkörperteilchen angereicherter Ab­gasteilstrom eingeleitet, der nach Abbrand der Festkörper­teilchen zusammen mit in die Brennkammer eingebrachter Zu­satzluft zusammen mit den restlichen Verbrennungsprodukten über ein zweites Tauchrohr als gereinigtes Abgas wieder ab­geführt wird. Bei dieser Einrichtung werden somit in der Brennkammer die brennbaren Festkörperteilchen des Abgases direkt zu Abgasreinigungszwecken verbrannt. Ein Hinweis auf die Anwendung dieser Einrichtung in Verbindung mit der Re­generierung von Rußfilteranlagen ist dort nicht beschrieben, sondern diese Einrichtung stellt eine Alternative zu der Verwendung von Partikel-Filteranlagen im Abgasbereich einer Diesel-Brennkraftmaschine beispielsweise dar.DE-OS 35 26 074 describes a device for removing combustible solid particles from exhaust gases from internal combustion engines, in which an ignition burner is provided which is connected to a combustion chamber via an overflow opening, additional air and fuel being supplied to the ignition burner. A partial exhaust gas stream enriched with the solid particles is introduced into the combustion chamber via a first immersion tube, and after the solid particles have burned off, it is discharged together with the remaining combustion products together with the remaining combustion products as purified exhaust gas via a second immersion tube. With this device, the combustible solid particles of the exhaust gas are thus burned directly for exhaust gas purification purposes in the combustion chamber. A reference to the use of this device in connection with the regeneration of soot filter systems is not described there, but this device represents an alternative to the use of particle filter systems in the exhaust gas area of a diesel internal combustion engine, for example.

Die Erfindung zielt darauf ab, einen Brenner für schwer-ent­zündbare Gasgemische der gattungsgemäßen Art bereitzustellen, der auch bei großem Sauerstoffmangel bzw. geringem 0₂-Gehalt im Abgas zuverlässig gezündet und die Flamme im Brenner sta­bil gehalten werden kann.The invention aims to provide a burner for difficult to ignite gas mixtures of the generic type, which can be reliably ignited even with a great lack of oxygen or a low 0₂ content in the exhaust gas and the flame in the burner can be kept stable.

Nach der Erfindung zeichnet sich ein Brenner für schwer-ent­zündbare Gasgemische, insbesondere für Abgase einer Diesel-­ Brennkraftmaschine, mit einer Brennkammer, einer Zündein­richtung und einer Brennstoffeinspritzdüse dadurch aus, daß in einem in Düsenstrahlrichtung der Brennstoffeinspritz­düse gemessenen Abstand von der Mündungsöffnung derselben ein Staukörper angeordnet ist, der sich etwa senkrecht zur Mittelachse der Brennstoffeinspritzdüse erstreckt.According to the invention, a burner for difficult to ignite gas mixtures, in particular for exhaust gases from a diesel Internal combustion engine, with a combustion chamber, an ignition device and a fuel injector, characterized in that a bluff body, which extends approximately perpendicular to the central axis of the fuel injector, is arranged at a distance from the mouth opening thereof measured in the jet direction of the fuel injector.

Bei dem Brenner nach der Erfindung wird durch den Staukörper die Brennkammer in ihrer Achsrichtung so unterteilt, daß sich im Bereich zwischen dem Staukörper und der Mündungs­öffnung der Brennstoffeinspritzdüse eine mit Sauerstoff ange­reicherte Zone bildet, die energiereich ist und eine hohe Wärmestromdichte hat. In dieser Zone läßt sich eine stabile Pilotflamme erzeugen, mittels der dann das schwer-entzündbare Gasgemisch in der Brennkammer des Brenners gezündet werden kann. Bei der erfindungsgemäßen Auslegung trifft ein Teil des von der Brennstoffeinspritzdüse abgegebenen Brennstoffs di­rekt auf den Staukörper, der in einem solchen Bereich der Brennkammer liegt, daß dieser glühend wird.In the burner according to the invention, the bluff body divides the combustion chamber in its axial direction so that an oxygen-enriched zone is formed in the area between the bluff body and the mouth opening of the fuel injector, which is energy-rich and has a high heat flux density. A stable pilot flame can be generated in this zone, by means of which the flame-retardant gas mixture can then be ignited in the combustion chamber of the burner. In the design according to the invention, part of the fuel emitted by the fuel injection nozzle hits the bluff body, which lies in such an area of the combustion chamber that it becomes glowing.

Durch diese Tempera­turanhebung bei glühendem Staukörper wird die Verbrennungswilligkeit des Gemisches auch im Falle eines Schwer-endzündbaren Gasgemisches erhöht. Ein Flammabriß bzw. ein Verlöschen der Flamme in der Brennkammer wird selbst dann vermieden, wenn die in die Brennkammer eingespeisten Abgase einen niedrigen Sauerstoffgehalt haben und/oder hohe Abgasmengen mit hohen Strömungsgeschwindigkeiten in die Brennkammer eintreten. Somit gewährleistet der Staukörper beim erfindungsgemäßen Brenner zugleich, daß die Flamme in der Brennkammer unabhängig von den Mengen und des Sauerstoff­gehalts des Abgases stabil aufrechterhalten wird. Der Stau­körper bewirkt ferner, daß stromabwärts desselben eine Ver­wirbelung erzeugt wird, wodurch die Vermischung der Gase in der Brennkammer stromab des Staukörpers mit dem Brennstoff intensiviert wird. Hierdurch werden günstigere Brennbedin­ gungen in der Brennkammer insgesamt gesehen erreicht.This increase in temperature when the bluff body is glowing increases the combustibility of the mixture even in the case of a gas mixture which is difficult to ignite. A flame arrest or extinguishing of the flame in the combustion chamber is avoided even if the exhaust gases fed into the combustion chamber have a low oxygen content and / or large amounts of exhaust gas enter the combustion chamber at high flow rates. The bluff body in the burner according to the invention thus simultaneously ensures that the flame in the combustion chamber is stably maintained regardless of the amounts and the oxygen content of the exhaust gas. The bluff body also causes a swirl to be generated downstream thereof, whereby the mixing of the gases in the combustion chamber downstream of the bluff body with the fuel is intensified. This makes the firing conditions cheaper achieved in the combustion chamber as a whole.

Da gemäß einer bevorzugten Ausbildungsform nach der Erfin­dung nur ein Teil des aus der Brennstoffdüse austretenden Brennstoffs auf den Staukörper trifft, während der Rest an diesem vorbeigeht, ist auch im Bereich der Brennkammer strom­abwärts von dem Staukörper Brennstoff vorhanden, der sich mit den dort befindlichen Gasen zu einem brennbaren Gasge­misch vermischen kann, so daß die in der Zone zwischen der Brennstoffdüse und dem Staukörper erzeugte Pilotflamme leicht in den stromabwärts des Staukörpers liegenden Bereich zur Verbrennung des dort vorhandenen Gasgemisches übertreten kann.Since, according to a preferred embodiment according to the invention, only a part of the fuel emerging from the fuel nozzle hits the bluff body while the rest passes it, fuel is also present in the region of the combustion chamber downstream of the bluff body, which is associated with the gases located there can mix a combustible gas mixture so that the pilot flame generated in the zone between the fuel nozzle and the bluff body can easily pass into the area downstream of the bluff body for combustion of the gas mixture present there.

Vorzugsweise ist der Staukörper als Stauscheibe ausgebildet und zweckmäßigerweise koaxial zur Achse der Brennstoffdüse derart angeordnet, daß ein Ringraum zwischen der Wand der Brennkammer und der Außenseite der Stauscheibe vorhanden ist, durch den von der Brennstoffdüse abgegebener Brennstoff zu dem stromabwärts der Stauscheibe liegenden Bereich der Brenn­kammer gelangen kann.The bluff body is preferably designed as a baffle plate and expediently arranged coaxially to the axis of the fuel nozzle in such a way that an annular space is present between the wall of the combustion chamber and the outside of the baffle plate, through which the fuel emitted by the fuel nozzle reaches the region of the combustion chamber located downstream of the baffle plate can.

Gemäß einer alternativen Auslegungsform kann der Staukörper von einer Lochscheibe gebildet werden, die eine Mittelöffnung hat und die an der Wand der Brennkammer angebracht ist. In diesem Fall tritt der Brennstoff aus der Brennstoffeinspritz­düse durch die Mittelöffnung der Lochscheibe in den von der Lochscheibe stromabwärtig liegenden Bereich der Brennkammer des Brenners ein.According to an alternative design, the bluff body can be formed by a perforated disc which has a central opening and which is attached to the wall of the combustion chamber. In this case, the fuel from the fuel injection nozzle enters through the central opening of the perforated disk into the region of the burner combustion chamber located downstream of the perforated disk.

Gemäß einer Ausführungsvariante nach der Erfindung kann der Staukörper auch von einem durchmesser-reduzierten Bereich der Brennkammer, wie z.B. einer Einschnürung gebildet wer­den, so daß man in der Brennkammer keine zusätzlichen Bau­teile, wie eine Stauscheibe oder eine Lochscheibe vorzusehen braucht.According to an embodiment variant of the invention, the bluff body can also be formed by a reduced-diameter area of the combustion chamber, such as a constriction, so that no additional components, such as a baffle plate or a perforated disk, need be provided in the combustion chamber.

Eine weitere bevorzugte Ausbildungsform des Brenners nach der Erfindung zeichnet sich dadurch aus, daß beim Betreiben des Brenners mit Abgas der Diesel-Brennkraftmaschine Brenn­luft, d.h. Frischluft bzw. Zusatzluft wenigstens in den Be­reich zwischen dem Staukörper und der Brennstoffeinspritzdüse eingeleitet wird, so daß in der Zündphase des Brenners schnell und zuverlässig eine Pilotflamme im Bereich zwischen der Brennstoffdüse und dem Staukörper erzeugt werden kann.Another preferred embodiment of the burner according to the invention is characterized in that when the burner is operated with exhaust gas from the diesel engine, combustion air, i.e. Fresh air or additional air is introduced at least into the area between the bluff body and the fuel injector, so that a pilot flame can be quickly and reliably generated in the area between the fuel nozzle and the bluff body in the ignition phase of the burner.

Gemäß einer weiteren bevorzugten Ausbildungsform nach der Erfindung wird beim Betreiben des Brenners mit Abgas der Diesel-Brennkraftmaschine das Abgas in die Brennkammer an einer Stelle eingeleitet, die in der Nähe des von der Brennstoff­einspritzdüse abgewandten Endes der Brennkammer liegt. Hier­durch wird erreicht, daß das von der Brennkraftmaschine kom­mende Abgas nicht direkt in den Bereich zwischen der Brenn­stoffeinspritzdüse und dem Staukörper gelangt, um die Auf­bereitung eines äußerst zündwilligen Gasgemisches in diesem Bereich nicht nachteilig durch die Abgase der Brennkraftma­schine zu beeinflussen.According to a further preferred embodiment of the invention, when the burner is operated with exhaust gas from the diesel engine, the exhaust gas is introduced into the combustion chamber at a point which is close to the end of the combustion chamber facing away from the fuel injector. This ensures that the exhaust gas coming from the internal combustion engine does not reach the area between the fuel injector and the bluff body so as not to adversely affect the treatment of an extremely ignitable gas mixture in this area by the exhaust gases of the internal combustion engine.

In überraschender Weise hat sich gezeigt, daß sich eine deutlich ver­besserte Funktion des Brenners erzielen läßt, wenn der Staukörper beispielsweise als Kegel, Kugel oder Kugelschale ausgelegt wird, die einem Kegel angenähert ist.Surprisingly, it has been shown that the burner can function significantly better if the bluff body is designed, for example, as a cone, ball or spherical shell which approximates a cone.

Die Erfindung wird nachstehend an Beispielen unter Bezugnahme auf die beigefügte Zeichnung näher erläutert. Darin zeigt:

  • Fig. 1 eine schematische Schnittansicht eines Brenners mit einem Staukörper,
  • Fig. 2 eine Draufsicht des Brenners nach Fig. 1 in der Schnittebene II-II in Fig. 1,
  • Fig. 3 eine schematische Ansicht einer Ausführungsva­riante eines Brenners mit einer abgewandelten Ausführungsform eines Staukörpers, und Fig. 4 eine weitere Ausführungsvariante eines Bren­ners mit einer weiteren Ausführungsvariante eines Staukörpers.
The invention is explained below using examples with reference to the accompanying drawings. It shows:
  • 1 is a schematic sectional view of a burner with a bluff body,
  • 2 is a plan view of the burner of FIG. 1 in the section plane II-II in Fig. 1,
  • 3 shows a schematic view of an embodiment variant of a burner with a modified embodiment of a bluff body, and Fig. 4 shows a further embodiment variant of a burner with a further embodiment variant of a bluff body.

In den Figuren der Zeichnung sind gleiche oder ähnliche Teile mit denselben Bezugszeichen versehen.In the figures of the drawing, identical or similar parts are provided with the same reference symbols.

In Fig. 1 ist ein Brenner insgesamt mit 1 bezeichnet. Der Brenner 1 weist eine Brennkammer 2 auf, an deren einem Ende eine Brennstoffeinspritzdüse 3 zur Brennstoffzufuhr vorge­sehen ist. Mit einem Pfeil ist an dem von der Brennstoff­einspritzdüse 3 gegenüberliegenden Ende der Brennkammer 2 der aus der Brennkammer 2 austretende heiße Verbrennungsgas­strom angedeutet, der bei der bevorzugten Anwendungsform nach der Erfindung einer nicht näher dargestellten Par­tikelfilter-Anlage im Abgastrakt einer Diesel-Brennkraftma­schine beispielsweise zugeleitet wird, so daß der oder die Partikelfilter, wie Rußfilter, nach dem Zusetzen regeneriert werden kann, wobei mit den heißen Verbrennungsgasen aus der Brennkammer 2 der Abbrand der Rußpartikel im Rußfilter einge­leitet werden kann. Der von der Mündungsöffnung 4 der Brenn­stoffeinspritzdüse 3 abgegebene Düsenstrahl ist in gebrochenen Linien eingetragen. In Richtung dieses Düsenstrahls gesehen ist im Abstand von der Mündungsöffnung 4 der Brennstoffein­spritzdüse 3 ein insgesamt mit 5 bezeichneter Staukörper ange­ordnet, der bei der Ausbildungsform nach den Fig. 1 und 2 von einer Stauscheibe 6 gebildet wird, die entsprechend Fig. 2 über Stege 7 an der Wand 8 der Brennkammer 2 angebracht ist. Über die schematisch mit 9 angedeutete Öffnung tritt vorzugs­weise sauerstoffreiche Luft, wie z.B. Frischluft oder Zusatz­luft, in die Brennkammer 2 ein. Am von der Brennstoffeinspritz­düse 3 abgewandt liegenden Ende der Brennkammer 2 ist ein Einlaß 10 dargestellt, über den von der Brennkraftmaschine beispielsweise kommende Abgase in die Brennkammer 2 eingeleitet werden. Ferner ist schematisch in den Figuren der Zeichnung und mit dem Bezugszeichen 11 versehen eine Zündeinrichtung dargestellt.In Fig. 1, a burner is generally designated 1. The burner 1 has a combustion chamber 2, at one end of which a fuel injection nozzle 3 is provided for supplying fuel. The arrow at the end of the combustion chamber 2 opposite the fuel injection nozzle 3 indicates the hot combustion gas stream emerging from the combustion chamber 2, which in the preferred application form according to the invention is fed to a particle filter system in the exhaust tract of a diesel engine, for example, so that the particulate filter or particulates, such as soot filters, can be regenerated after clogging, whereby the combustion of the soot particles in the soot filter can be initiated with the hot combustion gases from the combustion chamber 2. The nozzle jet emitted from the orifice 4 of the fuel injection nozzle 3 is entered in broken lines. Viewed in the direction of this nozzle jet, a baffle body, generally designated 5, is arranged at a distance from the mouth opening 4 of the fuel injection nozzle 3, which baffle is formed in the embodiment according to FIGS. 1 and 2 by a baffle plate 6, which according to FIG the wall 8 of the combustion chamber 2 is attached. Oxygen-rich air, such as fresh air or additional air, preferably enters the combustion chamber 2 via the opening indicated schematically by 9. At the end of the combustion chamber 2 facing away from the fuel injection nozzle 3, an inlet 10 is shown, through which exhaust gases coming from the internal combustion engine, for example, are introduced into the combustion chamber 2 will. Furthermore, an ignition device is shown schematically in the figures of the drawing and provided with the reference number 11.

Der Staukörper 5 unterteilt die Brennkammer 2 in eine zwi­schen der Brennstoffeinspritzdüse 3 und dem Staukörper 5 liegende erste Zone 2a und eine stromabwärts von dem Stau­körper 5 liegende zweite Zone 2b.The bluff body 5 divides the combustion chamber 2 into a first zone 2a lying between the fuel injection nozzle 3 and the bluff body 5 and a second zone 2b lying downstream of the bluff body 5.

Nachstehend wird die Arbeitsweise des vorstehend erläuterten Brenners 1 näher beschrieben. Bei dem Brenner 1 wird in der ersten Zone 2a um die Brennstoffeinspritzdüse 3 gegebenenfalls unter Zuleitung von Zusatzluft über die Öffnung 9 ein äußerst zündwilliges Gemisch aus Brennstoff und Brennluft aufbereitet, wobei ein Teil des von der Brennstoffeinspritzdüse 3 abgegebe­nen Brennstoffs auf den Staukörper 5 trifft. Mit Hilfe der Zündeinrichtung 11 wird dieses so aufbereitete Gemisch in der ersten Zone 2a der Brennkammer 2 gezündet und es bildet sich in dieser ersten Zone 2a eine Pilotflamme aus. Durch diese Pilotflamme wärmt sich der Staukörper 5, der nach den Fig.1 und 2 als Stauscheibe 6 ausgelegt ist, auf und hierdurch wird die Brennstoffverdampfung des auf den Staukörper 5 auftreffen­den Brennstoffteils des Brennstoffstrahls, der von der Brennstoffeinspritzdüse 3 kommt, intensiviert, indem durch die durch die Aufwärmung des Staukörpers 5 bewirkte Temperaturanhebung die Umgebungstemperatur in der Brennkammer 2 erhöht wird. Der so gebil­dete Brennstoffdampf wird von dem Teil des Brennstoffs mit­gerissen, der an dem Staukörper 5 vorbei in die Brennkammer gelangt, so daß dann mit Hilfe der Pilotflamme in der ersten Zone 2a das Gasgemisch in der zweiten Zone 2b der Brennkammer mit Hilfe der hierbei freigesetzten Energie zuverlässig zum Brennen gebracht werden kann. Dieses Gasgemisch in der zwei­ten Zone 2b der Brennkammer 2 enthält als Hauptbrennstoff die über den Einlaß 10 eingeleiteten Abgase der Brennkraftmaschine, deren Sauerstoffgehalt und deren Menge sowie Strömungsgeschwin­ digkeit sich in Abhängigkeit von den Betriebsbedingungen der Brennkraftmaschine stark ändern können. Der Staukörper 5 unterstützt zugleich die Durchmischung von Brennstoff und Gas in der Zone 2b der Brennkammer 2, da durch den Staukör­per 5 eine Verwirbelung des Gasgemisches erzeugt wird.The operation of the burner 1 explained above will be described below. In the burner 1, an extremely ignitable mixture of fuel and combustion air is prepared in the first zone 2a around the fuel injector 3, optionally with the supply of additional air through the opening 9, a portion of the fuel emitted by the fuel injector 3 striking the bluff body 5. With the aid of the ignition device 11, the mixture thus prepared is ignited in the first zone 2a of the combustion chamber 2 and a pilot flame is formed in this first zone 2a. This pilot flame heats the bluff body 5, which is designed as a baffle plate 6 according to FIGS. 1 and 2, and as a result the fuel evaporation of the fuel part of the fuel jet that strikes the bluff body 5, which comes from the fuel injection nozzle 3, is intensified by the temperature increase caused by the heating of the bluff body 5 increases the ambient temperature in the combustion chamber 2. The fuel vapor thus formed is entrained by the part of the fuel which passes the bluff body 5 and into the combustion chamber, so that with the aid of the pilot flame in the first zone 2a, the gas mixture in the second zone 2b of the combustion chamber with the help of the energy released in the process can be reliably made to burn. This gas mixture in the second zone 2b of the combustion chamber 2 contains as main fuel the exhaust gases of the internal combustion engine introduced via the inlet 10, their oxygen content and their quantity as well as the flow rate can change greatly depending on the operating conditions of the internal combustion engine. The bluff body 5 also supports the mixing of fuel and gas in the zone 2b of the combustion chamber 2, since the bluff body 5 creates a swirl of the gas mixture.

Im Brennbetrieb des Brenners 1 kommt der Staukörper 5 zum Glühen, und durch die hierbei abgestrahlte Wärme des glühen­den Staukörpers 5 wird die Flammrückzündgeschwindigkeit im Bereich der Flammwurzel aufgrund der Lage des Staukörpers 5 erhöht, so daß in der Brennkammer 2 eine stabile Flamme auf­rechterhalten wird. Selbst wenn über den Einlaß 10 Abgas mit niedrigem Sauerstoffgehalt und/oder hohe Abgasmengen bzw. das Abgas mit hoher Strömungsgeschwindigkeit eintritt, wird dank der erfindungsgemäßen Auslegung wirksam ein Abriß der Flamme in der Brennkammer 2 und hierdurch ein Verlöschen der Flamme vermieden. Beim erfindungsgemäßen Brenner kann somit beim Einleiten des Brennbetriebes zuverlässig eine Art Pilot­flamme in der ersten Zone 2a der Brennkammer 2 durch die Un­terstützung des Staukörpers 5 erzeugt werden, so daß auch un­ter äußerst ungünstigen Bedingungen das schwer-entzündbare Gasgemisch in der zweiten Zone 2b der Brennkammer 2 zum Brennen gebracht werden kann. Im Brennbetrieb des Brenners 1 wird mit Hilfe des Staukörpers 5 eine stabile Flamme in der Brennkammer 2 selbst bei ungünstigen Brennbedingungen in der zweiten Zone 2b der Brennkammer 2 aufrechterhalten.During the burning operation of the burner 1, the bluff body 5 starts to glow, and the heat radiated from the glowing bluff body 5 increases the flame re-ignition speed in the region of the flame root due to the position of the bluff body 5, so that a stable flame is maintained in the combustion chamber 2. Even if exhaust gas with a low oxygen content and / or high exhaust gas quantities or the exhaust gas with a high flow velocity occurs via the inlet 10, the inventive design effectively prevents the flame in the combustion chamber 2 from being broken off and thereby the flame from extinguishing. In the burner according to the invention, a type of pilot flame can thus be reliably generated in the first zone 2a of the combustion chamber 2 by the support of the bluff body 5 when the combustion operation is initiated, so that the flame-resistant gas mixture in the second zone 2b of the combustion chamber 2 even under extremely adverse conditions can be made to burn. In the burning mode of the burner 1, a stable flame is maintained in the combustion chamber 2 with the aid of the bluff body 5 even in the case of unfavorable burning conditions in the second zone 2b of the combustion chamber 2.

Die nachstehend erläuterten Ausführungsvarianten des Brenners 1 stimmen hinsichtlich der Wirkungs- und Funktionsweise über­ein, so daß nachstehend lediglich die konstruktiven Unter­schiede zu der anhand den Fig. 1 und 2 erläuterten Ausführungs­form des Brenners 1 näher beschrieben werden.The design variants of the burner 1 explained below correspond in terms of their mode of operation and operation, so that only the structural differences from the embodiment of the burner 1 explained with reference to FIGS. 1 and 2 are described in more detail below.

Der Brenner 1 nach Fig. 3 weist als Staukörper 5a eine Loch­scheibe 14 auf, die an der Wand 8 der Brennkammer 2 in einem Abstand von der Brennstoffeinspritzdüse 3 angebracht ist. Die Lochscheibe 14 hat etwa in axialer Verlängerung der Mündungsöffnung 4 der Brennstoffeinspritzdüse 3 wenigstens eine Mittelöffnung 15, durch die Brennstoff von der Brenn­stoffeinspritzdüse 3 in die zweite Zone 2b der Brennkammer 2 gelangen kann. Der andere Teil des von der Brennstoffein­spritzdüse 3 abgegebenen Brennstoffes trifft auf den schei­benförmigen Teil der Lochscheibe 14 auf, so daß der Staukörper 5a in Form der Lochscheibe 14 zu den im wesentlichen glei­chen Effekten wie der Staukörper 5 in Form der Stauscheibe 6 nach den Fig. 1 und 2 führt.The burner 1 according to FIG. 3 has a perforated disk 14 as the baffle 5a, which is in one on the wall 8 of the combustion chamber 2 Distance from the fuel injector 3 is attached. The perforated disk 14 has approximately in the axial extension of the mouth opening 4 of the fuel injection nozzle 3 at least one central opening 15 through which fuel can pass from the fuel injection nozzle 3 into the second zone 2b of the combustion chamber 2. The other part of the fuel emitted by the fuel injection nozzle 3 strikes the disk-shaped part of the perforated disk 14, so that the bluff body 5a in the form of the perforated disk 14 has the essentially same effects as the bluff body 5 in the form of the baffle disk 6 according to FIG. 1 and 2 leads.

Beim Brenner 1 nach Fig. 4 ist ein Staukörper 5b vorgesehen, der den freien Durchtrittsquerschnitt der Brennkammer 2 re­duziert. Wie in Fig. 4 dargestellt ist, ist der Staukörper 5b in Form einer Einschnürung der Brennkammer 2 ausgebildet. Mit diesem Staukörper 5b in Form einer Einschnürung 16 werden im wesentlichen dieselben Effekte wie vorangehend im Zusam­menhang mit der Ausführungsform nach den Fig. 1 und 2 erzielt.4, a bluff body 5b is provided which reduces the free passage cross section of the combustion chamber 2. As shown in FIG. 4, the bluff body 5b is designed in the form of a constriction of the combustion chamber 2. This bluff body 5b in the form of a constriction 16 essentially achieves the same effects as previously in connection with the embodiment according to FIGS. 1 and 2.

Selbstverständlich ist die Erfindung nicht auf das vorliegen­de Beispiel beschränkt, sondern es sind zahlreiche Abänderungen und Modifikationen möglich, die der Fachmann im Bedarfsfall treffen wird, ohne den Erfindungsgedanken zu verlassen. Ins­besondere können auch Kombinationen der vorangehend erläu­terten Ausbildungsformen des Staukörpers 5, 5a, 5b vorge­sehen werden, oder des können beispielsweise in Abständen voneinander entfernt auch zwei oder mehrere Staukörper 5, 5a, 5b in Strömungsrichtung gesehen hintereinander angeordnet werden. Selbstverständlich kann die Wirkung des Staukörpers 5, 5a, 5b auch durch eine entsprechende Ausbildung der In­nenwand 8 des Brennkammer 2 und/oder eine entsprechende An­ordnung der Brennstoffeinspritzdüse 3 erzielt werden. Ferner ist es möglich, daß die Brennstoffeinspritzdüse 3 auch in Abweichung von den dargestellten Beispielen nicht koaxial in der Brennkammer 2 vorgesehen ist, sondern beispielsweise achsversetzt oder geneigt angeordnet sein kann.Of course, the invention is not limited to the present example, but numerous changes and modifications are possible, which the person skilled in the art will make if necessary, without departing from the inventive concept. In particular, combinations of the above-described embodiments of the bluff body 5, 5a, 5b can also be provided, or two or more bluff bodies 5, 5a, 5b can be arranged one behind the other, for example at a distance from one another, as seen in the flow direction. Of course, the effect of the bluff body 5, 5a, 5b can also be achieved by a corresponding design of the inner wall 8 of the combustion chamber 2 and / or a corresponding arrangement of the fuel injection nozzle 3. It is also possible that the fuel injector 3 is not coaxial in deviation from the examples shown the combustion chamber 2 is provided, but can for example be arranged offset or inclined.

Wie in Fig. 1 in gebrochenen Linien eingetragen ist, kann die Stau­scheibe 6 durch einen Staukegel 5′ oder einen kugelschalenförmigen Staukörper 5˝ ersetzt werden. Als Staukörper 5 könnte auch ein solcher mit Kugelgestalt gewählt werden. Hierdurch kann bei fertigungs­technischer Vereinfachung ein effizienterer Betrieb des Brenners 1 erreicht werden.As shown in broken lines in Fig. 1, the baffle plate 6 can be replaced by a baffle cone 5 'or a spherical shell-shaped baffle 5˝. A bluff body 5 could also be chosen as a bluff body 5. As a result, the burner 1 can be operated more efficiently with a simplification in terms of production technology.

BezugszeichenlisteReference symbol list

  • 1 Brenner insgesamt1 burner in total
  • 2 Brennkammer2 combustion chamber
  • 2a erste Zone2a first zone
  • 2b zweite Zone2b second zone
  • 3 Brennstoffeinspritzdüse3 fuel injector
  • 4 Mündungsöffnung von Brennstoffeinspritzdüse 34 Mouth opening of fuel injector 3
  • 5 Staukörper5 bluff bodies
  • 5a Staukörper in Fig. 35a bluff body in FIG. 3
  • 5b Staukörper in Fig. 45b bluff body in FIG. 4
  • 6 Stauscheibe6 baffle plate
  • 7 Stege7 bridges
  • 8 Wand von Brennkammer 28 wall of combustion chamber 2
  • 9 Öffnung für Brennluft9 Opening for combustion air
  • 10 Einlaß für Abgase10 inlet for exhaust gases
  • 11 Zündeinrichtung11 ignition device
  • 14 Lochscheibe in Fig. 314 perforated disc in FIG. 3
  • 15 Mittelöffnung derselben15 middle opening of the same
  • 16 Einschnürung in Fig. 416 constriction in Fig. 4
  • 5′ Staukegel5 ′ cone
  • 5˝ Kugelschale5˝ spherical shell

Claims (11)

1. Brenner für schwer-entzündbare Gasgemische, ins­besondere für Abgase einer Brennkraftmaschine, mit einer Brennkammer, einer Zündeinrichtung und einer Brennstoffeinspritzdüse, dadurch gekennzeich­net, daß in einem in Düsenstrahlrichtung der Brennstoff­einspritzdüse (3) gemessenen Abstand von der Mündungsöff­nung (4) derselben ein Staukörper (5, 5a, 5b) angeordnet ist, der sich etwa senkrecht zur Mittelachse der Brennstoff­einspritzdüse (3) erstreckt.1. Burner for difficult to ignite gas mixtures, in particular for exhaust gases from an internal combustion engine, with a combustion chamber, an ignition device and a fuel injection nozzle, characterized in that a bluff body (measured in a nozzle jet direction of the fuel injection nozzle (3) from the mouth opening (4) thereof) 5, 5a, 5b) is arranged, which extends approximately perpendicular to the central axis of the fuel injector (3). 2. Brenner nach Anspruch 1, dadurch gekennzeichnet, daß ein Teil des aus der Brennstoffeinspritzdüse (3) austretenden Brennstoffs auf den Staukörper (5, 5a, 5b) trifft, während der Rest an diesem vorbeigeht.2. Burner according to claim 1, characterized in that part of the fuel emerging from the fuel injection nozzle (3) hits the bluff body (5, 5a, 5b), while the rest passes by this. 3. Brenner nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß der Staukörper (5) als Stauscheibe (6) aus­gebildet ist.3. Burner according to claim 1 or 2, characterized in that the bluff body (5) is designed as a baffle plate (6). 4. Brenner nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß der Staukörper (5a) von einem mit wenigstens einer Mittelöffnung (15) versehenen Lochscheibe (14) ge­bildet wird, die an der Wand (8) der Brennkammer (2) ange­bracht ist.4. Burner according to claim 1 or 2, characterized in that the bluff body (5a) is formed by an at least one central opening (15) provided perforated disc (14) which is attached to the wall (8) of the combustion chamber (2). 5. Brenner nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß der Staukörper (5b) von einem im durchmesser­reduzierten Bereich der Brennkammer (2) gebildet wird.5. Burner according to claim 1 or 2, characterized in that the bluff body (5b) is formed by a reduced diameter area of the combustion chamber (2). 6. Brenner nach Anspruch 5, dadurch gekennzeichnet, daß der durchmesser-reduzierte Bereich eine Einschnürung (16) der Brennkammer (2) ist.6. Burner according to claim 5, characterized in that the reduced-diameter area is a constriction (16) of the combustion chamber (2). 7. Brenner nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß beim Betreiben des Brenners (1) mit Abgas der Diesel-Brennkraftmaschine Brennluft wenigstens in den Bereich (2a) zwischen dem Staukörper (5, 5a, 5b) und der Brennstoffeinspritzdüse (3) eintritt.7. Burner according to one of the preceding claims, characterized in that when operating the burner (1) with exhaust gas from the diesel engine combustion air at least in the area (2a) between the bluff body (5, 5a, 5b) and the fuel injector (3) entry. 8. Brenner nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß beim Betreiben des Brenners (1) mit Abgas der Diesel-Brennkraftmaschine das Abgas im Bereich (2b) des von der Brennstoffeinspritzdüse (3) abgewandten Endes der Brennkammer (2) in diese eintritt.8. Burner according to one of the preceding claims, characterized in that when the burner (1) is operated with exhaust gas from the diesel internal combustion engine, the exhaust gas in the region (2b) of the end of the combustion chamber (2) facing away from the fuel injection nozzle (3) enters it . 9. Brenner nach einem der Ansprüche 1 bis 8, dadurch gekenn­zeichnet, daß der Staukörper (5, 5′, 5˝) eine in Staurichtung sphärisch gekrümmte Fläche aufweist.9. Burner according to one of claims 1 to 8, characterized in that the bluff body (5, 5 ', 5˝) has a spherically curved surface in the storage direction. 10. Brenner nach Anspruch 9, dadurch gekennzeichnet, daß der Staukörper als Staukegel (5′) ausgebildet ist.10. Burner according to claim 9, characterized in that the bluff body is designed as a baffle cone (5 '). 11. Brenner nach Anspruch 9, dadurch gekennzeichnet, daß der Staukörper als Kugelschale (5˝) ausgebildet ist.11. Burner according to claim 9, characterized in that the bluff body is designed as a spherical shell (5˝).
EP88118085A 1988-03-09 1988-10-31 Burner operated by the exhaust gas of an internal combustion engine Expired - Lifetime EP0331795B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3807632 1988-03-09
DE3807632 1988-03-09
DE3828256 1988-08-19
DE3828256A DE3828256A1 (en) 1988-03-09 1988-08-19 BURNER FOR HARD-FLAMMABLE GAS MIXTURES

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EP0331795A1 true EP0331795A1 (en) 1989-09-13
EP0331795B1 EP0331795B1 (en) 1992-03-18

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EP (1) EP0331795B1 (en)
JP (1) JPH02146408A (en)
DE (2) DE3828256A1 (en)

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Also Published As

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JPH02146408A (en) 1990-06-05
EP0331795B1 (en) 1992-03-18
DE3869391D1 (en) 1992-04-23
US4955183A (en) 1990-09-11
DE3828256A1 (en) 1989-09-21

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