EP0636836A2 - Burner for burning pulverulent fuel - Google Patents

Burner for burning pulverulent fuel Download PDF

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Publication number
EP0636836A2
EP0636836A2 EP94100539A EP94100539A EP0636836A2 EP 0636836 A2 EP0636836 A2 EP 0636836A2 EP 94100539 A EP94100539 A EP 94100539A EP 94100539 A EP94100539 A EP 94100539A EP 0636836 A2 EP0636836 A2 EP 0636836A2
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EP
European Patent Office
Prior art keywords
air tube
burner
primary
burner according
air pipe
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94100539A
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German (de)
French (fr)
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EP0636836B1 (en
EP0636836A3 (en
Inventor
Alfons Leisse
Michael Streffing
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Hitachi Power Europe GmbH
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Babcock Lentjes Kraftwerkstechnik GmbH
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Publication of EP0636836A3 publication Critical patent/EP0636836A3/en
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Publication of EP0636836B1 publication Critical patent/EP0636836B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus

Definitions

  • the invention relates to a burner for burning dusty fuel with the features of the preamble of patent claim 1.
  • the invention has for its object to design the generic burner so that a more effective and controllable influence on the combustion process is made possible, which is primarily aimed at the chemical-physical relationships of nitrogen oxide formation and reduction in the primary combustion zone.
  • the defined annular gap formed between the flow guide device and the primary air pipe enables a partial flow of the secondary air to intervene in the ignition area of the flame core. In this way, an early ignition of the dusty fuel in the oxygen deficiency zone is supported.
  • the flow guiding device thus causes on the one hand a stabilization of the ignition on the burner and also a limited expansion of the flame in the radial direction.
  • the flow control device acts as an air repellent and thereby delays the mixing reaction between the oxygen in the combustion air and the fuel products. All of this reduces the formation of nitrogen oxide.
  • the partial flow of secondary air flowing through the annular gap can be changed in an advantageous embodiment of the invention with the aid of the displaceable throttle ring.
  • the different ignition behavior of different fuels can be influenced within a wide range.
  • the drawing shows the longitudinal section through a burner.
  • the burner which is used to burn coal dust, contains an oil burner ignition lance 2 which is provided in the longitudinal axis 1 of the burner and is arranged within a core air pipe 3.
  • the oil burner ignition lance 2 carries an oil atomizer nozzle 4 at the front end.
  • a swirl body 5 is arranged in the vicinity of the oil atomizer nozzle 4 within the core air tube 3.
  • the core air tube 3 is surrounded by a primary air tube 6 to form a cylindrical ring channel.
  • the primary air pipe 6 is connected at the rear end via a manifold 7 to a dust line 8, which leads to a mill, not shown.
  • a mixture of primary air or primary gas and coal dust is fed into the primary air pipe 6 via the dust line 8.
  • Swirl insert 9 is arranged, which is connected to a displacement body 10.
  • the displacement body 10 is attached to the core air tube 3.
  • the swirl insert 9, which can be fixed or adjustable, sets the stream of primary air or primary gas and coal dust in a rotational flow. As a result, the dust concentration in the primary air stream is evened out and at the same time pushed outwards. This effect is reinforced by the displacement body 10.
  • the primary air tube 6 is concentrically surrounded by a secondary air tube 12 to form a cylindrical ring channel, and this is in turn concentrically surrounded by a tertiary air tube 13 to form a cylindrical ring channel.
  • a burner throat 14 is connected to the tertiary air pipe 13 and merges into a burner mouth 15 in the wall 16 of a combustion chamber.
  • the burner groove 14 is formed from the tubes from which the wall 16 of the combustion chamber is constructed.
  • the secondary air tube 12 and the tertiary air tube 13 of each individual burner are each connected at the rear end to a spiral inlet housing 17, 18, which are connected to individual air inlet lines 21, 22 receiving flaps 19, 20.
  • the individual air inlet lines 21, 22 supply the secondary air pipe 12 with secondary air and the tertiary air pipe 13 with tertiary air as partial flows of the combustion air.
  • a device for influencing the swirl in the form of a cupboard can be rotated directly in front of the outlet end mounted axial swirl flaps 23, 24 which are adjustable from the outside via a linkage, not shown, and an actuator.
  • These axial swirl flaps 23, 24 impose a swirl of adjustable size on the secondary air and the tertiary air.
  • a permanently set swirl apparatus with a defined swirl intensity can also be used.
  • the primary air pipe 6 is surrounded by a flow guiding device 26 to form an annular gap 25.
  • the width of the annular gap 25 is greater than or equal to 1.5% of the outside diameter of the primary air pipe 6.
  • the direction of flow introduction consists of a cylindrical sleeve and is provided with an inflow segment 27 on the inflow side and with an outflow segment 28 on the outflow side.
  • the inflow segment 27 forms an inflow angle of maximum 45 ° with the burner longitudinal axis
  • the outflow segment 28 forms an outflow angle of maximum 25 ° with the burner longitudinal axis.
  • At least the inflow segment 27 and the cylindrical middle part of the flow guiding device 26 lie within the secondary air pipe 12.
  • the flow guiding device 26 divides the secondary air flowing through the secondary air pipe 12 into two partial flows, one of which flows through the annular gap 25.
  • the flow guide device 26 is centered on the primary air pipe 6 via support segments 29.
  • the support segments 29 can run parallel to the longitudinal axis 1 of the burner, or can preferably be set at an angle to the longitudinal axis of the burner. This angle is 0 ° to 80 °, preferably 45 °.
  • Such an adjustment forces the partial flow flowing through the annular gap 25 to rotate with a high mixing potential.
  • the partial flow of secondary air flowing through the annular gap 25 mixes into the flow of coal dust and primary air, which are swirled by the swirl insert 9 connected to the displacement body 10 and the ring 11 projecting into the primary air pipe 6.
  • the initial flame is generated by the partial flow of secondary air emerging from the annular gap 25 prevented from expanding in the radial direction.
  • the secondary air and the tertiary air mix with the fuel only with a delay, which is favored by the swirl of adjustable size imposed on these air streams.
  • a throttle ring 30 is arranged axially displaceable into the inlet opening of the flow guide device 26.
  • the proportions of the partial flows of the secondary air can be varied and thus the amount of secondary air which is mixed into the fuel products during their pyrolysis can be influenced.
  • the flow guide device 26 projects beyond the primary air pipe 6 and this in turn axially over the tertiary air pipe 13.
  • the part of the flow guiding device 26 projecting beyond the primary air pipe 6 accounts for 25% of the outside diameter of the primary air pipe 6.
  • the outlet cross sections of the tertiary air tube 13, the secondary air tube 12 and the flow guide device 26 are in a fixed relationship to one another, which is influenced by the procedural design of the burner.
  • the outer edges of the tertiary air tube 13, the secondary air tube 12 and the flow guide device 26 lie on a circular cone surface, the tip 31 of which points in the direction of flow.
  • the central angle of the circular cone surface is 40 ° to 60 °.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

A burner for burning pulverulent fuel with combustion air divided into concentric partial flows has a primary-air tube (6) which carries primary air or primary gas and fuel and is surrounded by a secondary-air tube (12) carrying secondary air. The primary-air tube (6) is surrounded by a flow-directing device (26) at the discharge end inside the secondary-air tube (12) while forming an annular gap (25). Secondary air flows through the flow-directing device (26), which is open on both sides and projects beyond the primary-air tube (6) in the axial direction by an amount which corresponds to a value of up to 25% of the outside diameter of the primary-air tube (6). The width of the annular gap (25) is at least equal to 1.5% of the outside diameter of the primary-air tube (6). <IMAGE>

Description

Die Erfindung betrifft einen Brenner zum verbrennen von staubförmigem Brennstoff mit den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to a burner for burning dusty fuel with the features of the preamble of patent claim 1.

Bei derartigen Brennern läßt sich aufgrund der Aufteilung der Verbrennungsluft in mehrere konzentrische Teilströme die Bildung von Stickoxid bei der Verbrennung des staubförmigen Brennstoffes unterdrücken. In der nicht vorveröffentlichten deutschen Patentanmeldung P 42 17 879.7 ist ein Brenner beschrieben, der diese Eigenschaft aufweist. Dieser Brenner zeichnet sich durch eine individuell regelbare Einzelluftzuführung aus, bei der über eine tangentiale Luftanströmung der Sekundärluftstrom und der Tertiärluftstrom gleichmäßig über den betreffenden Strömungsquerschnitt verteilt werden. Über Dralleinrichtungen in dem Sekundärluftrohr und dem Tertiärluftrohr kann der Drall der einzelnen Luftströme individuell verstärkt, vermindert oder aufgehoben werden, um je nach dem einzusetzenden Brennstoff die Mischungsintensivität von Brennstoff und Verbrennungsluft in einer inneren Verbrennungszone zu beeinflussen und um eine stabile, die innere Verbrennungszone umgebende Strömung zu erzeugen.In the case of such burners, the formation of nitrogen oxide during the combustion of the dust-like fuel can be suppressed due to the division of the combustion air into several concentric partial flows. In the unpublished German patent application P 42 17 879.7 a burner is described which has this property. This burner is characterized by an individually controllable individual air supply, in which the secondary air flow and the tertiary air flow are distributed evenly over the relevant flow cross section via a tangential air flow. The swirl of the individual air streams can be individually increased, reduced or eliminated via swirl devices in the secondary air tube and the tertiary air tube, in order to influence the mixture intensity of fuel and combustion air in an inner combustion zone and a stable flow surrounding the inner combustion zone, depending on the fuel to be used to create.

Der Erfindung liegt die Aufgabe zugrunde, den gattungsgemäßen Brenner so zu gestalten, daß eine wirkungsvollere und kontrollierbare Beeinflussung des Verbrennungsablaufes ermöglicht wird, die vorrangig auf die chemisch-physikalischen Zusammenhänge der Stickoxidbildung und -reduzierung in der primären Verbrennungszone ausgerichtet ist.The invention has for its object to design the generic burner so that a more effective and controllable influence on the combustion process is made possible, which is primarily aimed at the chemical-physical relationships of nitrogen oxide formation and reduction in the primary combustion zone.

Diese Aufgabe wird bei einem gattungsgemäßen Brenner erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche.This object is achieved in a generic burner according to the invention by the characterizing features of claim 1. Advantageous refinements are the subject of the dependent claims.

Der zwischen der Strömungsleiteinrichtung und dem Primärluftrohr gebildete, definierte Ringspalt ermöglicht es einem Teilstrom der Sekundärluft, sich in den Zündbereich des Flammenkernes einzumischen. Auf diese Weise wird eine frühe Zündung des staubförmigen Brennstoffes in der Sauerstoffmangelzone unterstützt. Die Strömungsleiteinrichtung bewirkt damit einerseits eine Stabilisierung der Anzündung am Brenner und darüber hinaus eine in radialer Richtung begrenzte Ausdehnung der Flamme. Andererseits wirkt die Strömungsleiteinrichtung luftabweisend und verzögert dadurch die Mischreaktion zwischen dem Sauerstoff der Verbrennungsluft und den Brennstoffprodukten. Dies alles vermindert eine Bildung von Stickoxid.The defined annular gap formed between the flow guide device and the primary air pipe enables a partial flow of the secondary air to intervene in the ignition area of the flame core. In this way, an early ignition of the dusty fuel in the oxygen deficiency zone is supported. The flow guiding device thus causes on the one hand a stabilization of the ignition on the burner and also a limited expansion of the flame in the radial direction. On the other hand, the flow control device acts as an air repellent and thereby delays the mixing reaction between the oxygen in the combustion air and the fuel products. All of this reduces the formation of nitrogen oxide.

Der den Ringspalt durchströmende Teilstrom der Sekundärluft kann in vorteilhafter Ausgestaltung der Erfindung mit Hilfe des verschiebbaren Drosselringes verändert werden. Dadurch kann das unterschiedliche Zündverhalten verschiedener Brennstoffe innerhalb eines weiten Bereiches beeinflußt werden.The partial flow of secondary air flowing through the annular gap can be changed in an advantageous embodiment of the invention with the aid of the displaceable throttle ring. As a result, the different ignition behavior of different fuels can be influenced within a wide range.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Die Zeichnung zeigt den Längsschnitt durch einen Brenner.An embodiment of the invention is shown in the drawing and is explained in more detail below. The drawing shows the longitudinal section through a burner.

Der Brenner, der zur Verbrennung von Kohlenstaub dient, enthält eine in der Brennerlängsachse 1 vorgesehene Ölbrennerzündlanze 2, die innerhalb eines Kernluftrohres 3 angeordnet ist. Die Ölbrennerzündlanze 2 trägt am vorderen Ende eine Ölzerstäuberdüse 4. In der Nähe der Ölzerstäuberdüse 4 ist innerhalb des Kernluftrohres 3 ein Drallkörper 5 angeordnet.The burner, which is used to burn coal dust, contains an oil burner ignition lance 2 which is provided in the longitudinal axis 1 of the burner and is arranged within a core air pipe 3. The oil burner ignition lance 2 carries an oil atomizer nozzle 4 at the front end. A swirl body 5 is arranged in the vicinity of the oil atomizer nozzle 4 within the core air tube 3.

Das Kernluftrohr 3 ist unter Bildung eines zylindrischen Ringkanals von einem Primärluftrohr 6 umgeben. Das Primärluftrohr 6 ist an dem rückwärtigen Ende über einen Krümmer 7 mit einer Staubleitung 8 verbunden, die zu einer nicht gezeigten Mühle führt. Über die Staubleitung 8 wird ein Gemisch aus Primärluft bzw. Primärgas und Kohlenstaub in das Primärluftrohr 6 eingespeist. In dem Primärluftrohr 6 ist in einem axialen Abstand von dem austrittsseitigen Ende ein Dralleinsatz 9 angeordnet, der mit einem Verdrängungskörper 10 verbunden ist. Der Verdrängungskörper 10 ist auf dem Kernluftrohr 3 befestigt. Der Dralleinsatz 9, der feststehend oder verstellbar sein kann, versetzt den Strom aus Primärluft bzw. Primärgas und Kohlenstaub in eine Rotationsströmung. Dadurch wird die Staubkonzentration in dem Primärluftstrom vergleichmäßigt und gleichzeitig nach außen gedrängt. Diese Wirkung wird durch den Verdrängungskörper 10 verstärkt.The core air tube 3 is surrounded by a primary air tube 6 to form a cylindrical ring channel. The primary air pipe 6 is connected at the rear end via a manifold 7 to a dust line 8, which leads to a mill, not shown. A mixture of primary air or primary gas and coal dust is fed into the primary air pipe 6 via the dust line 8. In the primary air pipe 6 is at an axial distance from the outlet end Swirl insert 9 is arranged, which is connected to a displacement body 10. The displacement body 10 is attached to the core air tube 3. The swirl insert 9, which can be fixed or adjustable, sets the stream of primary air or primary gas and coal dust in a rotational flow. As a result, the dust concentration in the primary air stream is evened out and at the same time pushed outwards. This effect is reinforced by the displacement body 10.

An dem austrittsseitigen Ende des Primärluftrohres 6 sind Einbauten in Form eines Ringes 11 angebracht, der eine radial nach innen gerichtete Kante aufweist. Diese Kante ragt in den Strom aus Primärluft bzw. Primärgas und Kohlenstaub hinein und bewirkt eine Aufreißen der Staubkonzentration im Randbereich des Primärluftrohres 6. Auf diese Weise werden Kohlenstaub und Primärluft in einem kleinen Volumenbereich intensiv verwirbelt.At the outlet end of the primary air tube 6, internals in the form of a ring 11 are attached, which has a radially inward edge. This edge protrudes into the flow of primary air or primary gas and coal dust and causes the dust concentration in the edge region of the primary air pipe 6 to be broken open. In this way, coal dust and primary air are swirled intensively in a small volume range.

Das Primärluftrohr 6 ist konzentrisch unter Bildung eines zylindrischen Ringkanals von einem Sekundärluftrohr 12 und dieses ist wiederum unter Bildung eines zylindrischen Ringkanals konzentrisch von einem Tertiärluftrohr 13 umgeben. An das Tertiärluftrohr 13 ist eine Brennerkehle 14 angeschlossen, die in eine Brennermündung 15 in der Wand 16 eines Feuerraumes übergeht. Die Brennerkehle 14 ist aus den Rohren gebildet, aus denen die Wand 16 des Feuerraumes aufgebaut ist.The primary air tube 6 is concentrically surrounded by a secondary air tube 12 to form a cylindrical ring channel, and this is in turn concentrically surrounded by a tertiary air tube 13 to form a cylindrical ring channel. A burner throat 14 is connected to the tertiary air pipe 13 and merges into a burner mouth 15 in the wall 16 of a combustion chamber. The burner groove 14 is formed from the tubes from which the wall 16 of the combustion chamber is constructed.

Das Sekundärluftrohr 12 und das Tertiärluftrohr 13 jedes einzelnen Brenners sind an dem rückwärtigen Ende jeweils mit einem spiralförmigen Einlaufgehäuse 17, 18 verbunden, die an Stellklappen 19, 20 aufnehmende Einzelluft-Eintrittsleitungen 21, 22 angeschlossen sind. Die Einzelluft-Eintrittsleitungen 21, 22 versorgen das Sekundärluftrohr 12 mit Sekundärluft und das Tertiärluftrohr 13 mit Tertiärluft als Teilströme der Verbrennungsluft.The secondary air tube 12 and the tertiary air tube 13 of each individual burner are each connected at the rear end to a spiral inlet housing 17, 18, which are connected to individual air inlet lines 21, 22 receiving flaps 19, 20. The individual air inlet lines 21, 22 supply the secondary air pipe 12 with secondary air and the tertiary air pipe 13 with tertiary air as partial flows of the combustion air.

In dem Sekundärluftrohr 12 und dem Tertiärluftrohr 13 ist jeweils unmittelbar vor dem Austrittsende eine Einrichtung zur Beeinflussung des Dralls in Form eines Geschränks aus drehbar gelagerten axialen Drallklappen 23, 24 angeordnet, die über ein nicht gezeigtes Gestänge und einen Stellantrieb von außen verstellbar sind. Durch diese axialen Drallklappen 23, 24 wird der Sekundärluft und der Tertiärluft ein Drall von einstellbarer Größe aufgezwungen. In einem Brenner, in dem ausschließlich Kohlenstaub von gleichbleibender Zusammensetzung und Qualität verbrannt werden soll, kann auch ein fest eingestellter Drallapparat mit definierter Drallintensität eingesetzt werden.In the secondary air tube 12 and the tertiary air tube 13, a device for influencing the swirl in the form of a cupboard can be rotated directly in front of the outlet end mounted axial swirl flaps 23, 24 which are adjustable from the outside via a linkage, not shown, and an actuator. These axial swirl flaps 23, 24 impose a swirl of adjustable size on the secondary air and the tertiary air. In a burner in which only coal dust of constant composition and quality is to be burned, a permanently set swirl apparatus with a defined swirl intensity can also be used.

Am austrittsseitigen Ende ist das Primärluftrohr 6 unter Bildung eines Ringspaltes 25 von einer Strömungsleiteinrichtung 26 umgeben. Die Breite des Ringspaltes 25 ist größer oder gleich 1,5% des Außendurchmessers des Primärluftrohres 6. Die Strömungseinleitrichtung besteht aus einer zylindrischen Hülse und ist auf der Anströmseite mit einem Anströmsegment 27 und auf der Abströmseite mit einem Abströmsegment 28 versehen. Das Anströmsegment 27 bildet mit der Brennerlängsachse einen Anströmwinkel von maximal 45°, und das Abströmsegment 28 bildet mit der Brennerlängsachse einen Abströmwinkel von maximal 25°. Zumindest das Anströmsegment 27 und der zylindrische Mittelteil der Strömungsleiteinrichtung 26 liegen innerhalb des Sekundärluftrohres 12. Die Strömungsleiteinrichtung 26 teilt die durch das Sekundärluftrohr 12 strömende Sekundärluft in zwei Teilströme auf, von denen einer durch den Ringspalt 25 strömt.At the outlet end, the primary air pipe 6 is surrounded by a flow guiding device 26 to form an annular gap 25. The width of the annular gap 25 is greater than or equal to 1.5% of the outside diameter of the primary air pipe 6. The direction of flow introduction consists of a cylindrical sleeve and is provided with an inflow segment 27 on the inflow side and with an outflow segment 28 on the outflow side. The inflow segment 27 forms an inflow angle of maximum 45 ° with the burner longitudinal axis, and the outflow segment 28 forms an outflow angle of maximum 25 ° with the burner longitudinal axis. At least the inflow segment 27 and the cylindrical middle part of the flow guiding device 26 lie within the secondary air pipe 12. The flow guiding device 26 divides the secondary air flowing through the secondary air pipe 12 into two partial flows, one of which flows through the annular gap 25.

Über Abstützsegmente 29 ist die Strömungsleiteinrichtung 26 auf dem Primärluftrohr 6 zentriert. Die Abstützsegmente 29 können parallel zur Brennerlängsachse 1 verlaufen, oder vorzugsweise unter einem Winkel zur Brennerlängsachse angestellt sein. Dieser Winkel beträgt 0° bis 80° vorzugsweise 45°. Durch eine solche Anstellung wird dem den Ringspalt 25 durchströmenden Teilstrom eine Rotation mit einem hohen Mischungspotential aufgezwungen. Der den Ringspalt 25 durchströmende Teilstrom der Sekundärluft mischt sich in den Strom aus Kohlenstaub und Primärluft ein, die durch den mit dem Verdrängungskörper 10 verbundenen Dralleinsatz 9 und den in das Primärluftrohr 6 hineinragenden Ring 11 verwirbelt sind. Gleichzeitig wird durch den aus dem Ringspalt 25 austretenden Teilstrom der Sekundärluft die Anfangsflamme daran gehindert sich in radialer Richtung auszudehnen. Dadurch vermischen die Sekundärluft und die Tertiärluft nur verzögert mit dem Brennstoff, was durch den diesen Luftströmen aufgezwungenen Drall von einstellbarer Größe begünstigt wird.The flow guide device 26 is centered on the primary air pipe 6 via support segments 29. The support segments 29 can run parallel to the longitudinal axis 1 of the burner, or can preferably be set at an angle to the longitudinal axis of the burner. This angle is 0 ° to 80 °, preferably 45 °. Such an adjustment forces the partial flow flowing through the annular gap 25 to rotate with a high mixing potential. The partial flow of secondary air flowing through the annular gap 25 mixes into the flow of coal dust and primary air, which are swirled by the swirl insert 9 connected to the displacement body 10 and the ring 11 projecting into the primary air pipe 6. At the same time, the initial flame is generated by the partial flow of secondary air emerging from the annular gap 25 prevented from expanding in the radial direction. As a result, the secondary air and the tertiary air mix with the fuel only with a delay, which is favored by the swirl of adjustable size imposed on these air streams.

Auf dem Primärluftrohr 6 ist ein Drosselring 30 axial bis in die Einlauföffnung der Strömungsleiteinrichtung 26 verschiebbar angeordnet. Durch ein Verschließen oder Freigeben des Ringspaltes 25 mit Hilfe des Drosselringes 30 können die Anteile der Teilströme der Sekundärluft variiert und damit die Sekundärluftmenge beeinflußt werden, die in die Brennstoffprodukte während deren Pyrolyse eingemischt wird.On the primary air pipe 6, a throttle ring 30 is arranged axially displaceable into the inlet opening of the flow guide device 26. By closing or releasing the annular gap 25 with the help of the throttle ring 30, the proportions of the partial flows of the secondary air can be varied and thus the amount of secondary air which is mixed into the fuel products during their pyrolysis can be influenced.

Die Strömungsleiteinrichtung 26 überragt das Primärluftrohr 6 und dieses wiederum das Tertiärluftrohr 13 in axialer Richtung. Der das Primärluftrohr 6 überragende Teil der Strömungsleiteinrichtung 26 macht 25 % des Außendurchmessers des Primärluftrohres 6 aus. Die Austrittsquerschnitte des Tertiärluftrohres 13, des Sekundärluftrohres 12 und der Strömungsleiteinrichtung 26 befinden sich in einem festen Verhältnis zueinander, das von der verfahrenstechnischen Auslegung des Brenners beeinflußt wird. Im günstigsten Fall liegen die Außenkanten des Tertiärluftrohres 13, des Sekundärluftrohres 12 und der Strömungsleiteinrichtung 26 auf einer Kreiskegelfläche, deren Spitze 31 in Strömungsrichtung weist. Der Zentriwinkel der Kreiskegelfläche beträgt 40° bis 60°.The flow guide device 26 projects beyond the primary air pipe 6 and this in turn axially over the tertiary air pipe 13. The part of the flow guiding device 26 projecting beyond the primary air pipe 6 accounts for 25% of the outside diameter of the primary air pipe 6. The outlet cross sections of the tertiary air tube 13, the secondary air tube 12 and the flow guide device 26 are in a fixed relationship to one another, which is influenced by the procedural design of the burner. In the best case, the outer edges of the tertiary air tube 13, the secondary air tube 12 and the flow guide device 26 lie on a circular cone surface, the tip 31 of which points in the direction of flow. The central angle of the circular cone surface is 40 ° to 60 °.

Claims (13)

Brenner zum Verbrennen von staubförmigem Brennstoff mit in konzentrische Teilströme aufgeteilter Verbrennungsluft, wobei der Brenner ein Primärluft bzw. Primärgas und Brennstoff führendes Primärluftrohr (6) aufweist, das von einem Sekundärluft führenden Sekundärluftrohr (12) umgeben ist, dadurch gekennzeichnet, daß das Primärluftrohr (6) an dem austrittsseitigen Ende innerhalb des Sekundärluftrohres (12) unter Bildung eines Ringspaltes (25) von einer beidseitig offenen, von Sekundärluft durchströmten Strömungsleiteinrichtung (26) umgeben ist, die das Primärluftrohr (6) in axialer Richtung um einen Betrag überragt, der einem Wert von bis zu 25 % des Außendurchmessers des Primärluftrohres (6) entspricht, und daß die Breite des Ringspaltes (25) mindestens gleich 1,5 % des Außendurchmessers des Primärluftrohres (6) ist.Burner for burning dusty fuel with combustion air divided into concentric partial flows, the burner having a primary air pipe (6) carrying primary air or primary gas and fuel, which is surrounded by a secondary air pipe (12) carrying secondary air, characterized in that the primary air pipe (6 ) is surrounded at the outlet end within the secondary air tube (12) to form an annular gap (25) by a flow guide device (26) which is open on both sides and through which secondary air flows and which axially projects beyond the primary air tube (6) by an amount that corresponds to a value corresponds to up to 25% of the outside diameter of the primary air pipe (6), and that the width of the annular gap (25) is at least equal to 1.5% of the outside diameter of the primary air pipe (6). Brenner nach Anspruch 1, dadurch gekennzeichnet, daß die Strömungsleiteinrichtung (26) auf dem Primärluftrohr(6) über Abstützsegmente (29) abgestützt ist, die in Strömungsrichtung der Sekundärluft in einem Winkel von maximal 80° angeordnet sind.Burner according to claim 1, characterized in that the flow guiding device (26) is supported on the primary air pipe (6) by means of support segments (29) which are arranged in the flow direction of the secondary air at an angle of at most 80 °. Brenner nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Strömungsleiteinrichtung (26) mit einem Abströmsegment (28) versehen ist, das mit der Brennerlängsachse (1) einen Abströmwinkel von maximal 25° bildet.Burner according to one of claims 1 or 2, characterized in that the flow guide device (26) is provided with an outflow segment (28) which forms an outflow angle of at most 25 ° with the longitudinal axis of the burner (1). Brenner nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Strömungsleiteinrichtung (26) mit einem Anströmsegment (27) versehen ist, das mit der Brennerlängsachse (1) einen Anströmwinkel von maximal 45° bildet.Burner according to one of claims 1 to 3, characterized in that the flow guide device (26) is provided with an inflow segment (27) which forms an inflow angle of at most 45 ° with the longitudinal axis of the burner (1). Brenner nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß auf dem Primärluftrohr (6) ein Drosselring (30) angeordnet ist, der axial bis in den Einlaufquerschnitt der Strömungsleiteinrichtung (26) verschiebbar ist.Burner according to one of claims 1 to 4, characterized in that on the primary air pipe (6) Throttle ring (30) is arranged, which is axially displaceable into the inlet cross section of the flow guide (26). Brenner nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß in dem Sekundärluftrohr (12) stromaufwärts von der Strömungsleiteinrichtung (26) ein Drallklappengeschränk angeordnet ist.Burner according to one of claims 1 to 5, characterized in that a swirl flap cabinet is arranged in the secondary air pipe (12) upstream of the flow guide device (26). Brenner nach Anspruch 6, dadurch gekennzeichnet, daß das Drallklappengeschränk verstellbar ist.Burner according to claim 6, characterized in that the swirl flap cabinet is adjustable. Brenner nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß innerhalb des Primärluftrohres (6) ein eine Ölzündbrennerlanze (2) aufnehmendes Kernluftrohr (3) angeordnet ist und daß innerhalb des Primärluftrohres (6) ein fester oder verstellbarer Dralleinsatz (9) angeordnet ist, der mit einem auf dem Kernluftrohr (3) befestigten Verdrängungskörper(10) verbunden ist.Burner according to one of claims 1 to 7, characterized in that a core air tube (3) receiving an oil pilot burner lance (2) is arranged within the primary air tube (6) and that a fixed or adjustable swirl insert (9) is arranged within the primary air tube (6) which is connected to a displacement body (10) fastened to the core air tube (3). Brenner nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß an dem austrittsseitigen Ende des Primärluftrohres (6) eine Vorrichtung zum Aufreißen der Staubkonzentration im Randbereich des Primärluftrohres (6) angeordnet ist.Burner according to one of Claims 1 to 8, characterized in that a device for tearing open the dust concentration in the edge region of the primary air pipe (6) is arranged at the outlet-side end of the primary air pipe (6). Brenner nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Sekundärluftrohr (12) von einem Tertiärluft führenden Tertiärluftrohr (13) umgeben ist und daß das Sekundärluftrohr (12) das Tertiärluftrohr (13) in axialer Richtung überragt.Burner according to one of claims 1 to 9, characterized in that the secondary air tube (12) is surrounded by a tertiary air tube (13) carrying tertiary air and that the secondary air tube (12) projects beyond the tertiary air tube (13) in the axial direction. Brenner nach Anspruch 10, dadurch gekennzeichnet, daß in dem Tertiärluftrohr (13) ein fester oder verstellbarer Drallkörper angeordnet ist.Burner according to claim 10, characterized in that a fixed or adjustable swirl body is arranged in the tertiary air tube (13). Brenner nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die Strömungsleiteinrichtung (26) das Sekundärluftrohr (12) in axialer Richtung überragt.Burner according to one of claims 1 to 11, characterized in that the flow guiding device (26) projects beyond the secondary air pipe (12) in the axial direction. Brenner nach den Ansprüchen 9 und 12, dadurch gekennzeichnet, daß die Außenkanten des Tertiärluftrohres (13) des Sekundärluftrohres (12) und der Strömungsleiteinrichtung (26) auf einer Kreiskegelfläche liegen, deren Spitze (31) in Strömungsrichtung weist und deren Zentriwinkel 40° bis 60° beträgt.Burner according to claims 9 and 12, characterized in that the outer edges of the tertiary air tube (13) of the secondary air tube (12) and the flow guiding device (26) lie on a circular conical surface, the tip (31) of which points in the direction of flow and the central angle of 40 ° to 60 ° is.
EP94100539A 1993-07-30 1994-01-15 Burner for burning pulverulent fuel Expired - Lifetime EP0636836B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4325643 1993-07-30
DE4325643A DE4325643A1 (en) 1993-07-30 1993-07-30 Burners for burning dusty fuel

Publications (3)

Publication Number Publication Date
EP0636836A2 true EP0636836A2 (en) 1995-02-01
EP0636836A3 EP0636836A3 (en) 1995-08-09
EP0636836B1 EP0636836B1 (en) 1998-07-29

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ID=6494104

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EP94100539A Expired - Lifetime EP0636836B1 (en) 1993-07-30 1994-01-15 Burner for burning pulverulent fuel

Country Status (9)

Country Link
US (1) US5651320A (en)
EP (1) EP0636836B1 (en)
CN (1) CN1074825C (en)
AT (1) ATE169101T1 (en)
DE (2) DE4325643A1 (en)
DK (1) DK0636836T3 (en)
ES (1) ES2119910T3 (en)
FI (1) FI104125B (en)
ZA (1) ZA941358B (en)

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WO1997047923A1 (en) * 1996-06-14 1997-12-18 Mitsui Babcock Energy Limited Fluent fuel fired burner
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DE102015111585A1 (en) 2015-07-16 2017-01-19 Mitsubishi Hitachi Power Systems Europe Gmbh Coal dust burner with one-piece, electrically heated fuel nozzle
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Also Published As

Publication number Publication date
CN1098180A (en) 1995-02-01
ES2119910T3 (en) 1998-10-16
US5651320A (en) 1997-07-29
ATE169101T1 (en) 1998-08-15
EP0636836B1 (en) 1998-07-29
FI941806A0 (en) 1994-04-19
DE4325643A1 (en) 1995-02-02
FI941806A (en) 1995-01-31
EP0636836A3 (en) 1995-08-09
DE59406540D1 (en) 1998-09-03
FI104125B1 (en) 1999-11-15
CN1074825C (en) 2001-11-14
FI104125B (en) 1999-11-15
DK0636836T3 (en) 1999-04-26
ZA941358B (en) 1994-09-22

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