EP0598189A1 - Pulverizer for an oil burner - Google Patents

Pulverizer for an oil burner Download PDF

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Publication number
EP0598189A1
EP0598189A1 EP93112693A EP93112693A EP0598189A1 EP 0598189 A1 EP0598189 A1 EP 0598189A1 EP 93112693 A EP93112693 A EP 93112693A EP 93112693 A EP93112693 A EP 93112693A EP 0598189 A1 EP0598189 A1 EP 0598189A1
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EP
European Patent Office
Prior art keywords
bores
atomizer
outlet
nozzle head
mixing chamber
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Granted
Application number
EP93112693A
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German (de)
French (fr)
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EP0598189B1 (en
Inventor
Rolf Oppenberg
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Babcock Kraftwerkstechnik GmbH
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Babcock Feuerungssysteme GmbH
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Publication of EP0598189A1 publication Critical patent/EP0598189A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/101—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet
    • F23D11/102—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber

Definitions

  • the invention relates to an atomizer for an oil burner with the features of the preamble of claim 1.
  • So-called Y atomizing nozzles are used for the atomization of heating oil (US Pat. No. 24 80 459), in which atomizing steam with a constant pressure of about 10 to 11 bar is overheated and blown out of the atomizing head into the combustion chamber at a certain angle via several nozzle holes .
  • This atomizing steam is connected in a Y-like manner to the heating oil in common outlet bores of somewhat larger diameter before it emerges.
  • the expanding oil atomizes the fuel oil into fine droplets.
  • premix nozzles are known for atomizing heavy fuel oil in particular.
  • the heating oil enters a mixing chamber through a central tube, into which approximately tangential individual holes for guiding steam open.
  • the vapor states are comparable to those in the Y nozzle.
  • the heating oil is swirled with the steam in the mixing chamber and exits into the combustion chamber at a certain angle via individual outlet bores.
  • the bores opening into the mixing chamber are designed as Y-nozzles.
  • the outlet bores of the mixing chamber are arranged on two partial circles, the axes of the outlet bores of both groups forming the same angle to the longitudinal axis of the atomizer.
  • Another known premix nozzle (DE-PS 34 42 148) uses two consecutive mixing chambers.
  • the outlet bores of the rear mixing chamber have different cross sections and are arranged asymmetrically to the longitudinal center plane.
  • the invention has for its object to design the generic atomizer so that the atomization quality for the combustion of heavy heating and special oils is improved.
  • the atomizing steam is injected in a staggered manner, so that double atomization takes place, once in the mixing chamber and once again before it emerges from the Y-shaped outlet bores of the mixing chamber.
  • the staggered blowing can be used, according to claim 4, to guide a part of the atomizing steam as cooling and sealing steam between the detachably connected parts and the very hot gas atmosphere of the combustion chamber exposed parts on the atomizer head.
  • This cooling prevents the parts pressed against each other from loosening and thus prevents oil leakage.
  • the grouping of individual Y-shaped and differently inclined outlet bores according to claims 2 and 3 allows a staged fuel supply to the combustion chamber, which promotes a reduced formation of nitrogen oxide during combustion.
  • the atomizer shown belongs to a burner for the combustion of liquid fuel, in particular for the low-pollutant combustion of heavy heating or special oil. It consists of two supply lines 1, 2, one of which is used to supply the heating oil and the other to supply a vapor or gaseous atomizing medium such as water vapor or air.
  • the two feed lines 1, 2 are surrounded by an outer protective tube 3, which is connected to a nozzle head 5 via a base 4.
  • the nozzle head 5 consists of a head piece 6, an intermediate plate 7 and a cap 8, which are connected to one another in abutting manner by a union nut 9.
  • the union nut 9 engages with an internal thread 10 in an external thread attached to the head piece 6.
  • the union nut 9 is provided with a holding claw 11 which, when the union nut 9 is tightened, rests against a shoulder formed on the cap 8.
  • a chamber 12 is formed, into which the supply line 2 carrying the atomizing medium opens.
  • the supply line 2 carrying the atomizing medium opens.
  • Through the head piece 6 one or more through holes 13 are guided in the longitudinal direction, which connect the chamber 12 with an annular space 14, which is formed on the contact surface between the head piece 6 and the intermediate plate 7.
  • the supply line 1 carrying the heating oil is passed through the chamber 12 into the head piece 6 and opens into a channel 15 penetrating the head piece 6.
  • the intermediate plate 7 and the cap 8 enclose a mixing chamber 16 which is connected to the channel 15 carrying the heating oil via a through opening 17 which is provided centrally in the intermediate plate 7.
  • the mixing chamber 16 is provided with a plurality of outlet bores 18 which are guided obliquely through the cap 8.
  • Each outlet bore 18 contains two sections of different cross-section, the larger cross-section being on the outlet side.
  • axial bores 20 are made, the inlet ends of which are connected to the annular space 14 and which open into an annular chamber 21 which is formed on the contact surface between the intermediate plate 7 and the cap 8.
  • the heating oil flowing into the mixing chamber 16 from the channel 15 is swirled by the atomizing steam entering from the inlet bores 19 and then emerges from the outlet bores 18. Before the outlet from the outlet bores 18, the heating oil treated in this way is atomized again by the atomizing steam supplied from the oblique bores 22.
  • the edge recesses 24 are cut on the outside into the intermediate plate 7 and the cap 8.
  • Part of the atomizing steam is branched off via the transverse bores 23 and guided as cooling or sealing steam into the annular gap, which between the intermediate plate 7 and the cap 8 of the nozzle head 5 and the union nut 9 and is present between the cap 8 and the holding claw 11 of the union nut 9.
  • the axes of the outlet bores 18 form a central angle of a °.
  • the outlet bores can also be arranged in groups on two or more partial circles.
  • the axes of the outlet bores 18 ′ lying on the smaller pitch circle form a central angle of b that is smaller than the central angle a that the axes of the outlet bores 18 lying on the larger pitch circle form.
  • the amount of fuel which is passed through the outlet bores 18, 18 'assigned to each pitch circle can be of different sizes. For example, a larger amount of fuel will be blown in through the outlet bores 18 'arranged on the inner pitch circle and having the smaller central angle. This amount of fuel penetrates further into the combustion chamber, which leads to a reduced formation of nitrogen oxides during combustion.
  • a fuel gradation can be achieved by giving the upwardly directed outlet bores 18 of the horizontally arranged atomizer a larger cross section than the downwardly directed outlet bores 18, so that a larger amount of fuel is blown through the first-mentioned outlet bores.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Spray-Type Burners (AREA)
  • Nozzles (AREA)

Abstract

A pulveriser for an oil burner includes a feed line (1), which carries the oil and a feed line (2) which carries the pulverising medium and leads to a mixing chamber (16) formed in a nozzle head (5) and provided with outlet bores (18). Into each outlet bore (18) of the mixing chamber (16) there opens at an angle a bore (22), which is led through the nozzle head (5) and to which the channel (2) carrying the pulverising medium is connected. <IMAGE>

Description

Die Erfindung betrifft einen Zerstäuber für einen Ölbrenner mit den Merkmalen des Oberbegriffes des Anspruches 1.The invention relates to an atomizer for an oil burner with the features of the preamble of claim 1.

Für die Zerstäubung von Heizöl werden sogenannte Y-Zerstäuberdüsen eingesetzt (US-PS 24 80 459), bei denen Zerstäubungsdampf mit einem konstanten Druck von etwa 10 bis 11 bar leicht überhitzt über mehrere Düsenbohrungen aus dem Zerstäuberkopf unter einem bestimmten Winkel in den Feuerraum geblasen wird. Dieser Zerstäubungsdampf wird vor dem Austritt in gemeinsamen Austrittsbohrungen von etwas größerem Durchmesser Y-artig mit dem Heizöl in Verbindung gebracht. Dabei wird das Heizöl durch den expandierenden Zerstäubungsdampf in feine Tröpfchen zerrissen.So-called Y atomizing nozzles are used for the atomization of heating oil (US Pat. No. 24 80 459), in which atomizing steam with a constant pressure of about 10 to 11 bar is overheated and blown out of the atomizing head into the combustion chamber at a certain angle via several nozzle holes . This atomizing steam is connected in a Y-like manner to the heating oil in common outlet bores of somewhat larger diameter before it emerges. The expanding oil atomizes the fuel oil into fine droplets.

Weiterhin sind für die Zerstäubung insbesondere von schwerem Heizöl sogenannte Vorgemisch-Düsen bekannt. Bei diesen Düsen tritt das Heizöl über ein zentrales Rohr in eine Mischkammer ein, in die angenähert tangential einzelne Bohrungen zur Führung von Dampf einmünden. Die Dampfzustände sind vergleichbar mit denen in der Y-Düse. In der Mischkammer wird das Heizöl mit dem Dampf verwirbelt und tritt über einzelne Austrittsbohrungen unter einem bestimmten Winkel in den Feuerraum aus.Furthermore, so-called premix nozzles are known for atomizing heavy fuel oil in particular. With these nozzles, the heating oil enters a mixing chamber through a central tube, into which approximately tangential individual holes for guiding steam open. The vapor states are comparable to those in the Y nozzle. The heating oil is swirled with the steam in the mixing chamber and exits into the combustion chamber at a certain angle via individual outlet bores.

Bei einer bekannten Vorgemisch-Düse (VGB KRAFTWERKSTECHNIK 56 (1956) Seiten 622 bis 629) sind die in die Mischkammer einmündenden Bohrungen als Y-Düsen ausgebildet. Die Austrittsbohrungen der Mischkammer sind auf zwei Teilkreisen angeordnet, wobei die Achsen der Austrittsbohrungen beider Gruppen den gleichen Winkel zur Längsachse des Zerstäubers bilden. Eine andere bekannte Vorgemisch-Düse (DE-PS 34 42 148) verwendet zwei hintereinander liegende Mischkammern. Die Austrittsbohrungen der hinteren Mischkammer weisen unterschiedliche Querschnitte auf und sind unsymmetrisch zur Längsmittelebene angeordnet. Diese Maßnahmen dienen der gestuften Zuführung von Heizöl in den Feuerraum. In Anbetracht der gestiegenen Anforderungen an eine verminderte Schadstoffemission und bedingt durch die schlechter werdenden Qualitäten des Heizöles ist das durch die Vorgemisch-Düsen erzeugte Zerstäubungsergebnis nicht mehr ausreichend.In a known premixing nozzle (VGB KRAFTWERKSTECHNIK 56 (1956) pages 622 to 629), the bores opening into the mixing chamber are designed as Y-nozzles. The outlet bores of the mixing chamber are arranged on two partial circles, the axes of the outlet bores of both groups forming the same angle to the longitudinal axis of the atomizer. Another known premix nozzle (DE-PS 34 42 148) uses two consecutive mixing chambers. The outlet bores of the rear mixing chamber have different cross sections and are arranged asymmetrically to the longitudinal center plane. These measures serve the tiered supply of heating oil in the firebox. In view of the increased requirements for reduced pollutant emissions and the deteriorating qualities of the heating oil, the atomization result generated by the premix nozzles is no longer sufficient.

Der Erfindung liegt die Aufgabe zugrunde, den gattungsgemäßen Zerstäuber so zu gestalten, daß die Zerstäubungsqualität für die Verbrennung von schweren Heiz- und Sonderölen verbessert wird.The invention has for its object to design the generic atomizer so that the atomization quality for the combustion of heavy heating and special oils is improved.

Diese Aufgabe wird bei einem gattungsgemäßen Zerstäuber erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Vorteilhafte Ausgestaltung der Erfindung sind Gegenstand der Unteransprüche.This object is achieved according to the invention in a generic atomizer by the characterizing features of claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

Bei dem erfindungsgemäßen Zerstäuber wird der Zerstäubungsdampf gestaffelt eingeblasen, so daß eine doppelte Zerstäubung erfolgt und zwar einmal in der Mischkammer und noch einmal vor dem Austritt aus den Y-artig ausgebildeten Austrittsbohrungen der Mischkammer. Durch diese räumlich im Düsenkopf zusammengefaßte, doppelte Zerstäubung läßt sich die Zerstäubungsqualität auch bei problematischen Ölen wesentlich verbessern, so daß diese Brennstoffe vollständig und mit verminderter Schadstoffemission verbrannt werden können.In the atomizer according to the invention, the atomizing steam is injected in a staggered manner, so that double atomization takes place, once in the mixing chamber and once again before it emerges from the Y-shaped outlet bores of the mixing chamber. By means of this double atomization, spatially combined in the nozzle head, the atomization quality can be significantly improved even with problematic oils, so that these fuels can be burned completely and with reduced pollutant emissions.

Das gestaffelte Einblasen kann gemäß Anspruch 4 dazu benutzt werden, einen Teil des Zerstäubungsdampfes als Kühl- und Sperrdampf zwischen den miteinander lösbar verbundenen und der sehr heißen Gasatmosphäre des Feuerraumes ausgesetzten Teilen am Zerstäuberkopf zu führen. Durch diese Kühlung wird eine Lockerung der aneinander gepreßten Teile und damit eine Ölleckage verhindert. Die gruppenweise Zusammenfassung einzelner Y-artig ausgebildeter und unterschiedlich geneigter Austrittsbohrungen gemäß den Ansprüchen 2 und 3 läßt eine gestufte Brennstoffzuführung in den Feuerraum zu, die bei der Verbrennung eine verminderte Bildung von Stickoxid begünstigt.The staggered blowing can be used, according to claim 4, to guide a part of the atomizing steam as cooling and sealing steam between the detachably connected parts and the very hot gas atmosphere of the combustion chamber exposed parts on the atomizer head. This cooling prevents the parts pressed against each other from loosening and thus prevents oil leakage. The grouping of individual Y-shaped and differently inclined outlet bores according to claims 2 and 3 allows a staged fuel supply to the combustion chamber, which promotes a reduced formation of nitrogen oxide during combustion.

Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

  • Fig. 1 den Längsschnitt durch den vorderen Teil eines Zerstäubers,
  • Fig. 2 die Seitenansicht des Zerstäubers nach Fig. 1 in Blickrichtung A,
  • Fig. 3 den Längsschnitt durch den Kopf eines Zerstäubers gemäß einer anderen Ausführungsform und
  • Fig. 4 die Seitenansicht des Zerstäubers nach Fig. 3 in Blickrichtung A.
Several embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
  • 1 shows the longitudinal section through the front part of an atomizer,
  • 2 shows the side view of the atomizer according to FIG. 1 in viewing direction A,
  • Fig. 3 shows the longitudinal section through the head of an atomizer according to another embodiment and
  • 4 shows the side view of the atomizer according to FIG. 3 in viewing direction A.

Der dargestellte Zerstäuber gehört zu einem Brenner zur Verbrennung von flüssigem Brennstoff, insbesondere zur schadstoffarmen Verbrennung von schwerem Heiz- oder Sonderöl. Er besteht aus zwei Zuführungsleitungen 1, 2, von denen eine der Zuführung des Heizöles und die andere der Zuführung eines dampf- oder gasförmigen Zerstäubungsmediums wie Wasserdampf oder Luft dient. Die beiden Zuführungsleitungen 1, 2 sind von einem äußeren Schutzrohr 3 umgeben, das über einen Boden 4 mit einem Düsenkopf 5 verbunden ist. Der Düsenkopf 5 besteht aus einem Kopfstück 6, einer Zwischenplatte 7 und einer Kappe 8, die dicht aneinander stoßend durch eine Überwurfmutter 9 miteinander verbunden sind. Die Überwurfmutter 9 greift mit einem Innengewinde 10 in ein auf dem Kopfstück 6 angebrachtes Außengewinde ein. Die Überwurfmutter 9 ist mit einer Halteklaue 11 versehen, die bei angezogener Überwurfmutter 9 an einer an die Kappe 8 angeformten Schulter anliegt.The atomizer shown belongs to a burner for the combustion of liquid fuel, in particular for the low-pollutant combustion of heavy heating or special oil. It consists of two supply lines 1, 2, one of which is used to supply the heating oil and the other to supply a vapor or gaseous atomizing medium such as water vapor or air. The two feed lines 1, 2 are surrounded by an outer protective tube 3, which is connected to a nozzle head 5 via a base 4. The nozzle head 5 consists of a head piece 6, an intermediate plate 7 and a cap 8, which are connected to one another in abutting manner by a union nut 9. The union nut 9 engages with an internal thread 10 in an external thread attached to the head piece 6. The union nut 9 is provided with a holding claw 11 which, when the union nut 9 is tightened, rests against a shoulder formed on the cap 8.

Zwischen dem Boden 4 und dem Kopfstück 6 ist eine Kammer 12 gebildet, in die die das Zerstäubungsmedium führenden Zuführungsleitung 2 hineinmündet. Durch das Kopfstück 6 sind in Längsrichtung eine oder mehrere Durchgangsbohrungen 13 geführt, die die Kammer 12 mit einem Ringraum 14 verbinden, der an der Berührungsfläche zwischen dem Kopfstück 6 und der Zwischenplatte 7 gebildet ist. Die das Heizöl führende Zuführungsleitung 1 ist durch die Kammer 12 hindurch bis in das Kopfstück 6 geführt und mündet in einen das Kopfstück 6 durchdringenden Kanal 15.Between the bottom 4 and the head piece 6, a chamber 12 is formed, into which the supply line 2 carrying the atomizing medium opens. Through the head piece 6 one or more through holes 13 are guided in the longitudinal direction, which connect the chamber 12 with an annular space 14, which is formed on the contact surface between the head piece 6 and the intermediate plate 7. The supply line 1 carrying the heating oil is passed through the chamber 12 into the head piece 6 and opens into a channel 15 penetrating the head piece 6.

Die Zwischenplatte 7 und die Kappe 8 umschließen eine Mischkammer 16, die über eine zentral in der Zwischenplatte 7 angebrachte Durchgangsöffnung 17 mit dem das Heizöl führenden Kanal 15 verbunden ist. Am austrittsseitigen Ende ist die Mischkammer 16 mit mehreren Austrittsbohrungen 18 versehen, die schräg durch die Kappe 8 geführt sind. Jede Austrittsbohrung 18 enthält zwei Abschnitte von unterschiedlichem Querschnitt, wobei der größere Querschnitt auf der Austrittsseite liegt.The intermediate plate 7 and the cap 8 enclose a mixing chamber 16 which is connected to the channel 15 carrying the heating oil via a through opening 17 which is provided centrally in the intermediate plate 7. At the outlet end, the mixing chamber 16 is provided with a plurality of outlet bores 18 which are guided obliquely through the cap 8. Each outlet bore 18 contains two sections of different cross-section, the larger cross-section being on the outlet side.

In die Mischkammer 16 münden schräg und angenähert tangential mehrere Eintrittsbohrungen 19 hinein, die von dem den Zerstäubungsdampf führenden Ringraum 14 ausgehen. In der Verlängerung des Ringraumes 14 sind durch die Zwischenplatte 7 Axialbohrungen 20 geführt, deren Eintrittsenden mit dem Ringraum 14 in Verbindung stehen und die in eine Ringkammer 21 münden, die an der Berührungsfläche zwischen der Zwischenplatte 7 und der Kappe 8 gebildet ist. Von der Ringkammer 21 gehen Schrägbohrungen 22 aus, die durch die Kappe 8 des Düsenkopfes 5 geführt sind und unter Bildung von Y-Düsen in dem größeren Abschnitt der Austrittsbohrungen 18 enden.A plurality of inlet bores 19, which emanate from the annular space 14 carrying the atomizing vapor, open obliquely and approximately tangentially into the mixing chamber 16. In the extension of the annular space 14 through the intermediate plate 7 axial bores 20 are made, the inlet ends of which are connected to the annular space 14 and which open into an annular chamber 21 which is formed on the contact surface between the intermediate plate 7 and the cap 8. From the annular chamber 21 there are oblique bores 22 which are guided through the cap 8 of the nozzle head 5 and end in the larger section of the outlet bores 18 with the formation of Y-nozzles.

Das aus dem Kanal 15 in die Mischkammer 16 einströmende Heizöl wird durch den aus den Eintrittsbohrungen 19 eintretenden Zerstäubungsdampf verwirbelt und tritt anschließend aus den Austrittsbohrungen 18 aus. Vor dem Austritt aus den Austrittsbohrungen 18 wird das so behandelte Heizöl durch den aus den Schrägbohrungen 22 zugeführten Zerstäubungsdampf noch einmal zerstäubt.The heating oil flowing into the mixing chamber 16 from the channel 15 is swirled by the atomizing steam entering from the inlet bores 19 and then emerges from the outlet bores 18. Before the outlet from the outlet bores 18, the heating oil treated in this way is atomized again by the atomizing steam supplied from the oblique bores 22.

Von einer oder mehreren der Axialbohrungen 20 und der Schrägbohrungen 22 gehen Querbohrungen 23 aus, die in ringförmigen Randausnehmungen 24 enden. Die Randausnehmungen 24 sind auf der Außenseite in die Zwischenplatte 7 und die Kappe 8 geschnitten. Über die Querbohrungen 23 wird ein Teil des Zerstäubungsdampfes abgezweigt und als Kühl- oder Sperrdampf in den Ringspalt geführt, der zwischen der Zwischenplatte 7 und der Kappe 8 des Düsenkopfes 5 und der Überwurfmutter 9 sowie zwischen der Kappe 8 und der Halteklaue 11 der Überwurfmutter 9 vorhanden ist.Cross bores 23, which end in annular edge recesses 24, start from one or more of the axial bores 20 and the oblique bores 22. The edge recesses 24 are cut on the outside into the intermediate plate 7 and the cap 8. Part of the atomizing steam is branched off via the transverse bores 23 and guided as cooling or sealing steam into the annular gap, which between the intermediate plate 7 and the cap 8 of the nozzle head 5 and the union nut 9 and is present between the cap 8 and the holding claw 11 of the union nut 9.

Bei der Ausführungsform gemäß Fig. 1 bilden die Achsen der Austrittsbohrungen 18 einen Zentriwinkel von a°. Wie in den Fig. 3 und 4 dargestellt ist, können die Austrittsbohrungen auch gruppenweise auf zwei oder mehr Teilkreisen angeordnet sein. Dabei bilden die Achsen der auf dem kleineren Teilkreis liegenden Austrittsbohrungen 18' einen Zentriwinkel von b, der kleiner als der Zentriwinkel a ist, den die Achsen der auf dem größeren Teilkreis liegenden Austrittsbohrungen 18 bilden.In the embodiment according to FIG. 1, the axes of the outlet bores 18 form a central angle of a °. As shown in FIGS. 3 and 4, the outlet bores can also be arranged in groups on two or more partial circles. The axes of the outlet bores 18 ′ lying on the smaller pitch circle form a central angle of b that is smaller than the central angle a that the axes of the outlet bores 18 lying on the larger pitch circle form.

Die Brennstoffmenge, die durch die jedem Teilkreis zugeordneten Austrittsbohrungen 18, 18' durchgesetzt wird, kann unterschiedlich groß sein. So wird man meistens durch die auf dem inneren Teilkreis angeordneten und den kleineren Zentriwinkel aufweisenden Austrittsbohrungen 18' eine größere Brennstoffmenge einblasen. Diese Brennstoffmenge dringt weiter in den Feuerraum ein, was zu einer verminderten Bildung von Stickoxiden bei der Verbrennung führt. Bei einer Frontalfeuerung kann man eine Brennstoffstufung dadurch erreichen, daß man den nach oben gerichteten Austrittsbohrungen 18 des horizontal angeordneten Zerstäubers einen größeren Querschnitt gibt als den nach unten gerichteten Austrittsbohrungen 18, so daß durch die erstgenannten Austrittsbohrungen eine größere Brennstoffmenge eingeblasen wird.The amount of fuel which is passed through the outlet bores 18, 18 'assigned to each pitch circle can be of different sizes. For example, a larger amount of fuel will be blown in through the outlet bores 18 'arranged on the inner pitch circle and having the smaller central angle. This amount of fuel penetrates further into the combustion chamber, which leads to a reduced formation of nitrogen oxides during combustion. In frontal firing, a fuel gradation can be achieved by giving the upwardly directed outlet bores 18 of the horizontally arranged atomizer a larger cross section than the downwardly directed outlet bores 18, so that a larger amount of fuel is blown through the first-mentioned outlet bores.

Claims (4)

Zerstäuber für einen Ölbrenner mit einer das Öl und einer ein Zerstäubungsmedium führenden Zuführungsleitung (1, 2), die zu einer in einem Düsenkopf (5) gebildeten und mit Austrittsbohrungen (18) versehenen Mischkammer (16) führen, dadurch gekennzeichnet, daß in jede Austrittsbohrung (18) der Mischkammer (16) unter einem Winkel eine Bohrung (22) mündet, die durch den Düsenkopf (5) hindurchgeführt und mit der das Zerstäubungsmedium führenden Zuführungsleitung (2) verbunden ist.Atomizer for an oil burner with a supply line (1, 2) carrying the oil and an atomizing medium, which leads to a mixing chamber (16) formed in a nozzle head (5) and provided with outlet bores (18), characterized in that in each outlet bore (18) of the mixing chamber (16) opens at an angle a bore (22) which passes through the nozzle head (5) and is connected to the supply line (2) carrying the atomizing medium. Zerstäuber nach Anspruch 1, dadurch gekennzeichnet, daß die Austrittsbohrungen (18, 18') gruppenweise angeordnet sind und daß die Längsachsen der Austrittsbohrungen (18, 18') jeder Gruppe einen unterschiedlichen Winkel zur Längsachse des Zerstäubers bilden.Atomizer according to claim 1, characterized in that the outlet bores (18, 18 ') are arranged in groups and that the longitudinal axes of the outlet bores (18, 18') of each group form a different angle to the longitudinal axis of the atomizer. Zerstäuber nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Austrittsbohrungen (18) beiderseits der Längsmittelebene des Zerstäubers einen unterschiedlich großen Querschnitt aufweisen.Atomizer according to claim 1 or 2, characterized in that the outlet bores (18) have a different cross-section on both sides of the longitudinal center plane of the atomizer. Zerstäuber nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der die Mischkammer (16) umschließende Düsenkopf (5) aus mehreren Teilen besteht, die durch eine Überwurfmutter (9) verbunden sind und daß von den den Düsenkopf (5) durchdringenden, das Zerstäubungsmedium führenden Bohrungen (20, 22) Querbohrungen (23) ausgehen, die nach außen in den Zwischenraum zwischen dem Düsenkopf (5) und der Überwurfmutter (9) geführt sind.Atomizer according to one of claims 1 to 3, characterized in that the nozzle head (5) surrounding the mixing chamber (16) consists of several parts which are connected by a union nut (9) and that of which penetrates the nozzle head (5) Bores (20, 22) leading to the atomizing medium emanate transverse bores (23) which are guided outwards into the space between the nozzle head (5) and the union nut (9).
EP93112693A 1992-11-17 1993-08-07 Pulverizer for an oil burner Expired - Lifetime EP0598189B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4238736A DE4238736A1 (en) 1992-11-17 1992-11-17 Atomizer for an oil burner
DE4238736 1992-11-17

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EP0598189A1 true EP0598189A1 (en) 1994-05-25
EP0598189B1 EP0598189B1 (en) 1998-01-07

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EP (1) EP0598189B1 (en)
AT (1) ATE161938T1 (en)
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Also Published As

Publication number Publication date
DE4238736A1 (en) 1994-05-19
DE59307935D1 (en) 1998-02-12
US5368230A (en) 1994-11-29
ATE161938T1 (en) 1998-01-15
EP0598189B1 (en) 1998-01-07

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