EP0538594A2 - Mixing device for oil burner - Google Patents
Mixing device for oil burner Download PDFInfo
- Publication number
- EP0538594A2 EP0538594A2 EP92114810A EP92114810A EP0538594A2 EP 0538594 A2 EP0538594 A2 EP 0538594A2 EP 92114810 A EP92114810 A EP 92114810A EP 92114810 A EP92114810 A EP 92114810A EP 0538594 A2 EP0538594 A2 EP 0538594A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide vanes
- cone
- swirl
- mixing device
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002156 mixing Methods 0.000 title claims description 11
- 239000000446 fuel Substances 0.000 claims description 7
- 241000446313 Lamella Species 0.000 claims 1
- 230000001133 acceleration Effects 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- 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
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
- F23D11/406—Flame stabilising means, e.g. flame holders
Definitions
- the invention relates to a mixing device according to the preamble of patent claim 1.
- a mixing device of this type can be found in DE-05 39 37 925.
- the burner tube has a narrowing cone with four to six beads at an angle of 15 to 45 °.
- At the entrance of the cone there is a baffle plate with radial slots and a cylindrical rim.
- the slanted beads have the task of giving the secondary air flow a swirl which stabilizes the enclosed flame and supports the swirl of the primary air formed by the baffle plate.
- a subsequent constriction of the cone ultimately prevents the swirl that is created from dissolving and ensures good combustion results with a reduction in NO x formation.
- An oil burner is to be created which, as a result of strong swirl formation and maintenance, results in extremely low-pollutant combustion.
- the NO x values are to be reduced beyond what was previously the case.
- the mixing device according to the invention has the features mentioned in the characterizing part of patent claim 1.
- the many guide vanes with an angle of attack of at least 45 ° result in a division of the secondary air flow into many individual swirl jets.
- a low static pressure is converted into a high dynamic pressure in these channels. This pressure increase in connection with the strong swirl components leads to a strong acceleration of the secondary air flow.
- a larger number of guide vanes and a large angle of attack are required for the function. More than six, preferably 12 to 24, guide vanes with an angle of attack of 45 to 80 ° are recommended.
- the guide vanes should be guided to the mouth of the cone in order to achieve the full effect.
- the entry angle should initially be small. This is made possible by curved guide vanes, which have an inflow angle of 0 to 20 ° and then change to the desired inflow angle of more than 45 °.
- Air acceleration is achieved by narrowing the flow lanes.
- the inflow cross section should at least halve towards the outflow cross section. This can be achieved by assigning and designing the inner cylinder, the guide vanes and the cone.
- the guide vanes can be arranged in a known manner on the inner wall of the cone.
- the inner cylinder if necessary as a cylindrical edge of the baffle plate, must be inserted on the inside.
- the baffle plate and rim unit can be mounted on the fuel lance so as to be longitudinally movable.
- the guide vanes can also be arranged on the inner cylinder. They then form a swirl cone to be inserted into the cone with the inner cylinder.
- the inner cylinder can directly surround the fuel lance without a separate baffle plate.
- the burner tube 1 there is a fuel lance 2 on which a baffle plate 3 with swirl slots is mounted.
- the baffle plate 3 has a collar-shaped edge to form an inner cylinder 4.
- the burner tube 1 forms a tapering outlet cone 5.
- swirl bodies in the form of many guide vanes 6 are arranged at an angle ⁇ of more than 45 °.
- An angle ⁇ 1 of only 0-20 ° is recommended on the inflow side to avoid shock losses.
- Swirl channels 7 are formed by the guide vanes 6, the cone 5 and the edge 4 of the baffle plate 3, which taper sharply towards the mouth. This can be reinforced by increasing the blade width, which is indicated in FIG. 2. It is advisable to taper the inflow cross section A1 to the outflow cross section A2 at least to half the value.
- the swirl bodies are arranged in the form of many guide blades 6 on the inner cylinder 4, which directly surrounds the fuel lance 2.
- the unit comprising the inner cylinder 4 and guide vanes 6 forms a swirl cone which can be inserted into the cone 5, the confusing effect of which goes far beyond the action of the previously known swirl bodies.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
Abstract
Description
Die Erfindung betrifft eine Mischvorrichtung nach dem Oberbegriff des Patentanspruches 1.The invention relates to a mixing device according to the preamble of
Eine Mischvorrichtung dieser Art ist der DE-05 39 37 925 zu entnehmen. Dabei besitzt das Brennerrohr einen stromab sich verengenden Ausmündungs-Konus mit vier bis sechs Sicken in einem Anstellwinkel von 15 bis 45 °. Am Eingang des Konusses sitzt eine Stauscheibe mit radialen Schlitzen und einem zylinderförmigen Rand. Die schräg gestellten Sicken haben die Aufgabe, der Sekundärluftströmung einen Drall zu geben, welcher die eingeschlossene Flamme stabilisiert und den durch die Stauscheibe gebildeten Drall der Primärluft unterstützt. Eine nachgeschaltete Einschnürung des Konusses verhindert schließlich das Auflösen des entstandenen Dralls und sorgt für gute Verbrennungsergebnisse mit einer Reduzierung der NOx -Bildung.A mixing device of this type can be found in DE-05 39 37 925. The burner tube has a narrowing cone with four to six beads at an angle of 15 to 45 °. At the entrance of the cone there is a baffle plate with radial slots and a cylindrical rim. The slanted beads have the task of giving the secondary air flow a swirl which stabilizes the enclosed flame and supports the swirl of the primary air formed by the baffle plate. A subsequent constriction of the cone ultimately prevents the swirl that is created from dissolving and ensures good combustion results with a reduction in NO x formation.
Es soll ein Ölbrenner geschaffen werden, der infolge einer starken Drallbildung und -erhaltung eine äußerst schadstoffarme Verbrennung ergibt. Dabei sollen insbesondere die NOx -Werte über das bisher übliche Maß hinaus reduziert werden.An oil burner is to be created which, as a result of strong swirl formation and maintenance, results in extremely low-pollutant combustion. In particular, the NO x values are to be reduced beyond what was previously the case.
Die erfindungsgemäße Mischvorrichtung besitzt die im Kennzeichen des Patentanspruches 1 genannten Merkmale.The mixing device according to the invention has the features mentioned in the characterizing part of
Durch die vielen Leitschaufeln mit einem Anstellwinkel von mindestens 45 ° entsteht eine Aufteilung des Sekundärluftstromes in viele einzelne Drallstrahlen. Dabei bilden jeweils zwei benachbarte Leitschaufeln mit dem zylinderförmigen Rand der Stauscheibe bzw. dem Innenzylinder und dem Ausmündungskonus des Brennerrohres Drallkanäle, die sich zur Ausmündung hin injektorartig verjüngen. In diesen Kanälen wird ein geringer statischer Druck in einen hohen dynamischen Druck umgewandelt. Diese Druckerhöhung führt in Verbindung mit der starken Drallkomponenten zu einer starken Beschleunigung des Sekundärluftstromes.The many guide vanes with an angle of attack of at least 45 ° result in a division of the secondary air flow into many individual swirl jets. Each form two adjacent guide vanes with the cylindrical edge of the baffle plate or the inner cylinder and the mouth cone of the burner tube swirl channels which taper towards the mouth in an injector-like manner. A low static pressure is converted into a high dynamic pressure in these channels. This pressure increase in connection with the strong swirl components leads to a strong acceleration of the secondary air flow.
Die Integration verschiedener Einzelfunktionen in der Mischvorrichtung, nämlich die Drallbildung, die Erzeugung klar begrenzter Drallstrahlen und die Luftbeschleunigung infolge der Verjüngung der Kanäle führt zu einer Homogenisierung der Sekundärluft und zu guten strömungstechnischen Wirkungsgraden. Das hat unter Einhaltung der gesamten geometrischen Parameter zur Folge, daß bei der Verbrennung die NOx -Werte wesentlich reduziert werden.The integration of various individual functions in the mixing device, namely the swirl formation, the generation of clearly limited swirl jets and the air acceleration due to the tapering of the ducts leads to a homogenization of the secondary air and to good fluidic efficiency. In compliance with the entire geometric parameters, this has the consequence that the NO x values are significantly reduced during combustion.
Für die Funktion ist eine größere Anzahl an Leitschaufeln und ein starker Anstellwinkel erforderlich. Mehr als sechs, vorzugsweise 12 bis 24, Leitschaufeln mit Anstellwinkel von 45 bis 80 ° sind zu empfehlen. Dabei sollen die Leitschaufeln bis zur Ausmündung des Konusses geführt sein, um die volle Wirkung zu erzielen.A larger number of guide vanes and a large angle of attack are required for the function. More than six, preferably 12 to 24, guide vanes with an angle of attack of 45 to 80 ° are recommended. The guide vanes should be guided to the mouth of the cone in order to achieve the full effect.
Zur Vermeidung von Stoßverlusten beim Eintritt in die Kanäle sollte der Eintrittswinkel zunächst noch gering sein. Das wird durch gekrümmte Leitschaufeln ermöglicht, die einen Einströmwinkel von 0 bis 20 ° besitzen und sich dann auf den gewünschten Anströmwinkel von mehr als 45 ° verändern.To avoid impact losses when entering the channels, the entry angle should initially be small. This is made possible by curved guide vanes, which have an inflow angle of 0 to 20 ° and then change to the desired inflow angle of more than 45 °.
Die Luftbeschleunigung wird durch die Verengung der Strömungsgassen erzielt. Der Einströmquerschnitt sollte sich zum Ausströmquerschnitt hin mindestens halbieren. Das ist durch die Zuordnung und Gestaltung des Innenzylinders, der Leitschaufeln und des Konusses zu erreichen.Air acceleration is achieved by narrowing the flow lanes. The inflow cross section should at least halve towards the outflow cross section. This can be achieved by assigning and designing the inner cylinder, the guide vanes and the cone.
Die Leitschaufeln können in bekannter Weise an der Innenwand des Konusses angeordnet sein. In diesem Fall ist der Innenzylinder, ggfs. als zylindrischer Rand der Stauscheibe, innen einzufügen. Die Einheit aus Stauscheibe und Rand kann auf der Brennstofflanze längsbeweglich gelagert sein.The guide vanes can be arranged in a known manner on the inner wall of the cone. In this case, the inner cylinder, if necessary as a cylindrical edge of the baffle plate, must be inserted on the inside. The baffle plate and rim unit can be mounted on the fuel lance so as to be longitudinally movable.
Die Leitschaufeln können auch am Innenzylinder angeordnet sein. Sie bilden dann einen mit dem Innenzylinder in den Konus einzufügenden Drallkegel. Dabei kann der Innenzylinder die Brennstofflanze unter Verzicht auf eine separate Stauscheibe direkt umgeben.The guide vanes can also be arranged on the inner cylinder. They then form a swirl cone to be inserted into the cone with the inner cylinder. The inner cylinder can directly surround the fuel lance without a separate baffle plate.
Die beigefügte Zeichnung stellt Ausführungsbeispiele der Erfindung dar. Es zeigt:
- Fig. 1:
- Einen Längsschnitt durch ein Brennerrohr mit eingebauter Stauscheibe und Brennstofflanze,
- Fig. 2 und Fig. 3:
- Längsschnitte durch die vordere Partie des Brennerrohres,
- Fig. 4 und Fig. 5:
- den Schnitt A-A aus Fig. 2 bzw. B-B aus Fig. 3,
- Fig. 6:
- einen Längsschnitt durch ein Brennerrohr mit eingebautem Drallkegel und Brennstofflanze und
- Fig. 7:
- die Ansicht des Drallkegels aus Fig. 5 von rechts.
- Fig. 1:
- A longitudinal section through a burner tube with built-in baffle plate and fuel lance,
- 2 and 3:
- Longitudinal sections through the front part of the burner tube,
- 4 and 5:
- the section AA from FIG. 2 or BB from FIG. 3,
- Fig. 6:
- a longitudinal section through a burner tube with built-in swirl cone and fuel lance and
- Fig. 7:
- the view of the swirl cone of Fig. 5 from the right.
Im Brennerrohr 1 sitzt eine Brennstofflanze 2, auf der eine Stauscheibe 3 mit Drallschlitzen gelagert ist. Die Stauscheibe 3 besitzt einen kragenförmigen Rand zur Ausbildung eines Innenzylinders 4. Das Brennerrohr 1 bildet einen sich verjüngenden Ausmündungskonus 5. An dessen Innenseite sind gemäß Fig. 2 bis 5 Drallkörper in Form vieler Leitschaufeln 6 unter einem Winkel β von mehr als 45 ° angeordnet. Auf der Einströmseite empfiehlt sich ein Winkel β1 von nur 0-20 °, um Stoßverlusten zu vermeiden. Durch die Leitschaufeln 6, den Konus 5 und den Rand 4 der Stauscheibe 3 sind Drallkanäle 7 gebildet, die sich zur Ausmündung hin stark verjüngen. Das kann noch durch eine Verstärkung der Schaufelbreite verstärkt werden, was in Fig. 2 angedeutet ist. Es empfiehlt sich, den Einströmquerschnitt A1 zum Ausströmquerschnitt A2 mindestens auf den halben Wert düsenförmig zu verjüngen.In the
Eine Alternative zeigen die Fig. 6 und 7. Hier sind die Drallkörper in Form vieler Leitschaufeln 6 am Innenzylinder 4 angeordnet, der die Brennstofflanze 2 unmittelbar umgibt. Die Einheit aus Innenzylinder 4 und Leitschaufeln 6 bildet einen in den Konus 5 einsetzbaren Drallkegel, dessen Konfusorwirkung weit über die Wirkung der bisher bekannten Drallkörper hinausgeht.6 and 7 show an alternative. Here, the swirl bodies are arranged in the form of
Die Kombination aus Dralleffekt, Strömungsaufgliederung und Luftbeschleunigung führt zu einer erheblichen Reduzierung der NOx -Bildung.The combination of swirl effect, flow breakdown and air acceleration leads to a significant reduction in NO x formation.
Claims (6)
dadurch gekennzeichnet, daß mindestens sechs als Leitschaufeln (6) gestaltete Drallkörper unter einem Anstellwinkel (β) von mindestens 45 ° zwischen dem Konus (5) und dem Innenzylinder (4) vorhanden sind, wobei der Innenzylinder (4) sich etwa über die volle axiale Höhe der Leitschaufeln (6) erstreckt und gemeinsam mit zwei benachbarten Leitschaufeln (6) und dem Konus (5) zur Ausmündung hin sich verjüngende Drallkanäle (7) bildet.Mixing device for oil burners in a burner tube that tapers conically towards the mouth with an inner cylinder surrounding a baffle plate and / or a fuel lamella and with swirl bodies,
characterized in that at least six swirl bodies designed as guide vanes (6) are present at an angle of attack (β) of at least 45 ° between the cone (5) and the inner cylinder (4), the inner cylinder (4) extending approximately over the full axial Extends the height of the guide vanes (6) and forms together with two adjacent guide vanes (6) and the cone (5) tapering swirl channels (7) towards the mouth.
dadurch gekennzeichnet, daß sich der Einströmquerschnitt (A1) innerhalb der Drallkanäle (7) zum Ausströmquerschnitt (A2) hin mindestens halbiert.Mixing device according to claim 1,
characterized in that the inflow cross section (A1) within the swirl channels (7) towards the outflow cross section (A2) is at least halved.
dadurch gekennzeichnet, daß vorzugsweise 12-24 Leitschaufeln (6) unter einem Anstellwinkel (β) von 45-80 ° vorhanden und bis zur Ausmündung des Konusses (5) geführt sind.Mixing device according to claims 1 and 2,
characterized in that there are preferably 12-24 guide vanes (6) at an angle of attack (β) of 45-80 ° and are guided up to the mouth of the cone (5).
dadurch gekennzeichnet, daß die Leitschaufeln (6) an der Einmündung einen Anstellwinkel (β1) von 0-20 ° besitzen und daß sich dieser Winkel infolge einer Schaufelkrümmung auf den Anstellwinkel (β) von 45-80 ° vergrößert.Mixing device according to claims 1 to 3,
characterized in that the guide vanes (6) have an angle of attack (β1) of 0-20 ° at the mouth and that this angle increases due to a blade curvature to the angle of attack (β) of 45-80 °.
dadurch gekennzeichnet, daß die Leitschaufeln (6) an der Innenwand des Konusses (5) angeordnet sind.Mixing device according to claim 1,
characterized in that the guide vanes (6) are arranged on the inner wall of the cone (5).
dadurch gekennzeichnet, daß die Leitschaufeln (6) an der Außenwand des Innenzylinders (4) angeordnet sind und mit diesem einen in den Konus (5) eingefügten Drallkegel bildet.Mixing device according to claim 1,
characterized in that the guide vanes (6) are arranged on the outer wall of the inner cylinder (4) and together with this forms a swirl cone inserted into the cone (5).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4134651 | 1991-10-19 | ||
| DE4134651A DE4134651C3 (en) | 1991-10-19 | 1991-10-19 | Mixing device for an oil burner in a burner tube that tapers conically towards the mouth and leads to combustion air |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0538594A2 true EP0538594A2 (en) | 1993-04-28 |
| EP0538594A3 EP0538594A3 (en) | 1993-06-30 |
| EP0538594B1 EP0538594B1 (en) | 1996-01-10 |
Family
ID=6443047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92114810A Expired - Lifetime EP0538594B1 (en) | 1991-10-19 | 1992-08-29 | Mixing device for oil burner |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0538594B1 (en) |
| AT (1) | ATE132957T1 (en) |
| DE (2) | DE4134651C3 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT400182B (en) * | 1993-10-28 | 1995-10-25 | Vaillant Gmbh | Oil burner |
| DE102011075409A1 (en) | 2011-05-06 | 2012-11-08 | Wolf Gmbh | Mixing system for modulating burner and swirl body for mixing system |
| DE102014116411B4 (en) | 2014-11-11 | 2024-05-29 | Choren Industrietechnik GmbH | Swirl body and burner with swirl body and method for producing the swirl body |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2790490A (en) * | 1954-11-01 | 1957-04-30 | Earl K Smith | Oil burner |
| GB954664A (en) * | 1959-04-27 | 1964-04-08 | Laing Nikolaus | Improvements in or relating to blast air operated burners |
| DE3937925A1 (en) * | 1989-11-15 | 1991-05-16 | Electro Oil Gmbh | TWIST FLAME MIXING DEVICE FOR OIL BURNERS |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2078021A (en) * | 1935-07-02 | 1937-04-20 | Hilmer F Rodler | Oil burning apparatus |
| DE2623759C3 (en) * | 1976-05-26 | 1980-03-06 | Heinrich Brauckmann Armaturenfabrik Gmbh, 6950 Mosbach | Pressure atomizer oil burner |
| DE7724029U1 (en) * | 1977-08-02 | 1978-01-19 | Electro-Oil Oelbrenner Gmbh, 2057 Reinbek | MIXING DEVICE ON SMALL OIL BURNERS |
| DE3542174C1 (en) * | 1985-11-29 | 1987-07-02 | Electro Oil Gmbh | Mixing device for oil burners |
| DE8604089U1 (en) * | 1986-02-15 | 1986-04-03 | Klöckner & Co KGaA Zweigniederlassung Hechingen, 7450 Hechingen | Mixing device for a gas and oil burner |
-
1991
- 1991-10-19 DE DE4134651A patent/DE4134651C3/en not_active Expired - Fee Related
-
1992
- 1992-08-29 DE DE59205001T patent/DE59205001D1/en not_active Expired - Fee Related
- 1992-08-29 AT AT92114810T patent/ATE132957T1/en not_active IP Right Cessation
- 1992-08-29 EP EP92114810A patent/EP0538594B1/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2790490A (en) * | 1954-11-01 | 1957-04-30 | Earl K Smith | Oil burner |
| GB954664A (en) * | 1959-04-27 | 1964-04-08 | Laing Nikolaus | Improvements in or relating to blast air operated burners |
| DE3937925A1 (en) * | 1989-11-15 | 1991-05-16 | Electro Oil Gmbh | TWIST FLAME MIXING DEVICE FOR OIL BURNERS |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4134651A1 (en) | 1993-04-22 |
| EP0538594A3 (en) | 1993-06-30 |
| DE59205001D1 (en) | 1996-02-22 |
| DE4134651C2 (en) | 1993-09-09 |
| ATE132957T1 (en) | 1996-01-15 |
| EP0538594B1 (en) | 1996-01-10 |
| DE4134651C3 (en) | 1999-03-18 |
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