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EP0636836B1 - Burner for burning pulverulent fuel - Google Patents

Burner for burning pulverulent fuel Download PDF

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Publication number
EP0636836B1
EP0636836B1 EP94100539A EP94100539A EP0636836B1 EP 0636836 B1 EP0636836 B1 EP 0636836B1 EP 94100539 A EP94100539 A EP 94100539A EP 94100539 A EP94100539 A EP 94100539A EP 0636836 B1 EP0636836 B1 EP 0636836B1
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EP
European Patent Office
Prior art keywords
air pipe
primary
burner
burner according
primary air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94100539A
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German (de)
French (fr)
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EP0636836A2 (en
EP0636836A3 (en
Inventor
Alfons Leisse
Michael Streffing
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Power Europe GmbH
Original Assignee
Babcock Kraftwerkstechnik GmbH
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Publication date
Application filed by Babcock Kraftwerkstechnik GmbH filed Critical Babcock Kraftwerkstechnik GmbH
Publication of EP0636836A2 publication Critical patent/EP0636836A2/en
Publication of EP0636836A3 publication Critical patent/EP0636836A3/en
Application granted granted Critical
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 Claim 1.
  • a burner is known from NL-C-100 711.
  • the invention has for its object the generic To design burners so that a more effective and controllable influence on the combustion process is made possible, which is primarily based on the chemical-physical Relationships between nitrogen oxide formation and reduction in the primary combustion zone is aligned.
  • the one between the flow control device and the primary air pipe A defined, defined annular gap enables a partial flow the secondary air, in the ignition area of the flame core to get involved. In this way, an early ignition of the dusty fuel in the oxygen deficiency zone supported.
  • the flow guide thus causes on the one hand a stabilization of the ignition on the burner and in addition, an extent limited in the radial direction the flame.
  • the flow control device acts 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 in an advantageous embodiment of the invention using the movable throttle ring can be changed. This can do that different ignition behavior of different fuels can be influenced within a wide range.
  • FIG. 1 An embodiment of the invention is in the drawing shown and is explained in more detail below.
  • the drawing shows the longitudinal section through a burner.
  • the burner which is used to burn coal dust, contains an oil burner ignition lance provided in the burner longitudinal axis 1 2, which is arranged within a core air tube 3.
  • the Oil burner ignition lance 2 carries one at the front end Oil atomizer nozzle 4.
  • a swirl body 5 is arranged within the core air tube 3.
  • the core air tube 3 is cylindrical to form Ring channel surrounded by a primary air tube 6.
  • the Primary air tube 6 is at the rear end via an elbow 7 connected to a dust line 8, which is not a shown mill leads.
  • a mixture is created via the dust line 8 from primary air or primary gas and coal dust into the Primary air pipe 6 fed.
  • In the primary air pipe 6 is in an axial distance from the exit end Swirl insert 9 arranged with a displacement body 10 connected is.
  • the displacement body 10 is on the Core air tube 3 attached.
  • the primary air tube 6 is concentric to form a cylindrical ring channel from a secondary air tube 12 and this in turn forms a cylindrical ring channel surrounded concentrically by a tertiary air tube 13.
  • a tertiary air tube 13 To the Tertiary air tube 13 is connected to a burner throat 14 into a burner mouth 15 in the wall 16 of a combustion chamber transforms.
  • the burner throat 14 is formed from the tubes which the wall 16 of the furnace is constructed.
  • the secondary air tube 12 and the tertiary air tube 13 each individual burners are at the rear end with a spiral inlet housing 17, 18 connected to the Butterfly valves 19, 20 receiving individual air inlet lines 21, 22 are connected.
  • the individual air inlet lines 21, 22 supply the secondary air pipe 12 with secondary air and that Tertiary air tube 13 with tertiary air as partial flows of Combustion air.
  • the secondary air tube 12 and the tertiary air tube 13 is a facility for each immediately before the exit end Influencing the twist in the form of a cupboard made rotatable mounted axial swirl flaps 23, 24 arranged over a Linkage not shown and an actuator from the outside are adjustable. Through these axial swirl flaps 23, 24 the secondary air and the tertiary air a swirl of adjustable Size imposed. In a burner in which only Coal dust of constant composition and quality a fixed set can also be burned Swirl apparatus with a defined swirl intensity can be used.
  • the primary air pipe 6 is under formation an annular gap 25 from a flow guide device 26 surround.
  • 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 Flow direction consists of a cylindrical sleeve and is on the upstream side with an upstream segment 27 and provided on the outflow side with an outflow segment 28.
  • the Inflow segment 27 forms one with the burner longitudinal axis Inflow angle of maximum 45 °
  • the outflow segment 28 forms with the burner longitudinal axis an outflow angle of maximum 25 °.
  • At least the inflow segment 27 and the cylindrical middle part the flow guide 26 are within the Secondary air pipe 12.
  • the flow guide 26 divides the secondary air flowing through the secondary air pipe 12 in two Partial flows, one of which flows through the annular gap 25.
  • the flow guiding device 26 is open via support segments 29 the primary air pipe 6 centered.
  • the support segments 29 can run parallel to the burner longitudinal axis 1, or preferably be made at an angle to the longitudinal axis of the burner. This Angle is 0 ° to 80 °, preferably 45 °.
  • This Angle is 0 ° to 80 °, preferably 45 °.
  • a throttle ring 30 axially into the Inlet opening of the flow guide 26 is slidable arranged. By closing or releasing the Annular gap 25 with the help of the throttle ring 30 can the shares the partial flows of the secondary air vary and thus the Secondary air flow can be influenced in the Fuel products are mixed during their pyrolysis.
  • the flow guide device 26 projects beyond the primary air pipe 6 and this in turn the tertiary air tube 13 in the axial direction. That part of the primary air pipe 6 which projects beyond Flow guide 26 makes up 25% of the outside diameter of the Primary air tube 6 out.
  • 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 each other by the procedural Design of the burner is affected. In the best case lie the outer edges of the tertiary air tube 13, the Secondary air tube 12 and the flow guide 26 a circular conical surface, the tip 31 in the direction of flow points.
  • 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)
  • Combustion Of Fluid Fuel (AREA)
  • Manufacture, Treatment Of Glass Fibers (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. Ein solcher Brenner ist aus der NL-C- 100 711 bekannt.The invention relates to a burner for burning dusty fuel with the features of the preamble of Claim 1. Such a burner is known from NL-C-100 711.

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 DE-A- 42 17 879 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 such burners can be due to the division of the Combustion air in several concentric sub-flows forming of nitrogen oxide in the combustion of the dusty fuel suppress. In the unpublished German Patent application DE-A-42 17 879 describes a burner which has this property. This burner stands out an individually controllable individual air supply from which over a tangential air flow the secondary air flow and the Tertiary air flow evenly above that Flow cross section can be distributed. About swirl devices in the twist of the secondary air tube and the tertiary air tube individual air flows individually amplified, reduced or to be canceled, depending on the fuel to be used Mixing intensity of fuel and combustion air in an internal combustion zone and around a stable flow surrounding the inner combustion zone produce.

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 the generic To design burners so that a more effective and controllable influence on the combustion process is made possible, which is primarily based on the chemical-physical Relationships between nitrogen oxide formation and reduction in the primary combustion zone is aligned.

Diese Aufgabe wird bei einem gattungsgemäßen Brenner erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche. This task is carried out in a generic burner according to the invention by the characterizing features of Claim 1 solved. Advantageous configurations are Subject of the subclaims.

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 one between the flow control device and the primary air pipe A defined, defined annular gap enables a partial flow the secondary air, in the ignition area of the flame core to get involved. In this way, an early ignition of the dusty fuel in the oxygen deficiency zone supported. The flow guide thus causes on the one hand a stabilization of the ignition on the burner and in addition, an extent limited in the radial direction the flame. On the other hand, the flow control device acts 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 in an advantageous embodiment of the invention using the movable throttle ring can be changed. This can do that 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 in the drawing shown 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 provided in the burner longitudinal axis 1 2, which is arranged within a core air tube 3. The Oil burner ignition lance 2 carries one at the front end Oil atomizer nozzle 4. Near the oil atomizer nozzle 4 is a swirl body 5 is arranged 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 cylindrical to form Ring channel surrounded by a primary air tube 6. The Primary air tube 6 is at the rear end via an elbow 7 connected to a dust line 8, which is not a shown mill leads. A mixture is created via the dust line 8 from primary air or primary gas and coal dust into the Primary air pipe 6 fed. In the primary air pipe 6 is in an axial distance from the exit end Swirl insert 9 arranged with a displacement body 10 connected is. The displacement body 10 is on the Core air tube 3 attached. The swirl insert 9, the fixed or can be adjustable, offset the flow of primary air or primary gas and coal dust in a rotary flow. This causes the dust concentration in the primary airflow equalized and at the same time pushed outwards. This Effect is enhanced 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 pipe 6 are Built-in fixtures in the form of a ring 11, which is a radial has an inward edge. This edge protrudes into the Electricity from primary air or primary gas and coal dust in and causes the dust concentration in the edge area of the Primary air tube 6. In this way, coal dust and Primary air 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 concentric to form a cylindrical ring channel from a secondary air tube 12 and this in turn forms a cylindrical ring channel surrounded concentrically by a tertiary air tube 13. To the Tertiary air tube 13 is connected to a burner throat 14 into a burner mouth 15 in the wall 16 of a combustion chamber transforms. The burner throat 14 is formed from the tubes which the wall 16 of the furnace 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 each individual burners are at the rear end with a spiral inlet housing 17, 18 connected to the Butterfly valves 19, 20 receiving individual air inlet lines 21, 22 are connected. The individual air inlet lines 21, 22 supply the secondary air pipe 12 with secondary air and that Tertiary air tube 13 with tertiary air as partial flows of 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 is a facility for each immediately before the exit end Influencing the twist in the form of a cupboard made rotatable mounted axial swirl flaps 23, 24 arranged over a Linkage not shown and an actuator from the outside are adjustable. Through these axial swirl flaps 23, 24 the secondary air and the tertiary air a swirl of adjustable Size imposed. In a burner in which only Coal dust of constant composition and quality a fixed set can also be burned Swirl apparatus with a defined swirl intensity can 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 under formation an annular gap 25 from a flow guide device 26 surround. 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 Flow direction consists of a cylindrical sleeve and is on the upstream side with an upstream segment 27 and provided on the outflow side with an outflow segment 28. The Inflow segment 27 forms one with the burner longitudinal axis Inflow angle of maximum 45 °, and the outflow segment 28 forms with the burner longitudinal axis an outflow angle of maximum 25 °. At least the inflow segment 27 and the cylindrical middle part the flow guide 26 are within the Secondary air pipe 12. The flow guide 26 divides the secondary air flowing through the secondary air pipe 12 in 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 guiding device 26 is open via support segments 29 the primary air pipe 6 centered. The support segments 29 can run parallel to the burner longitudinal axis 1, or preferably be made at an angle to the longitudinal axis of the burner. This Angle is 0 ° to 80 °, preferably 45 °. By such Employment is the partial flow flowing through the annular gap 25 forced a rotation with a high mixing potential. The partial flow of secondary air flowing through the annular gap 25 mixes in the stream of coal dust and primary air, the by the swirl insert connected to the displacement body 10 9 and the ring 11 projecting into the primary air pipe 6 are swirled. At the same time, through the annular gap 25 emerging partial flow of secondary air the initial flame prevented from expanding in the radial direction. Thereby mix the secondary air and the tertiary air only with a delay with the fuel what through the these air streams forced swirl of adjustable size is favored.

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 is a throttle ring 30 axially into the Inlet opening of the flow guide 26 is slidable arranged. By closing or releasing the Annular gap 25 with the help of the throttle ring 30 can the shares the partial flows of the secondary air vary and thus the Secondary air flow can be influenced in the Fuel products are mixed during their pyrolysis.

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 the tertiary air tube 13 in the axial direction. That part of the primary air pipe 6 which projects beyond Flow guide 26 makes up 25% of the outside diameter of the Primary air tube 6 out. 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 each other by the procedural Design of the burner is affected. In the best case lie the outer edges of the tertiary air tube 13, the Secondary air tube 12 and the flow guide 26 a circular conical surface, the tip 31 in the direction of flow points. The central angle of the circular cone surface is 40 ° to 60 °.

Claims (12)

  1. Burner for combustion of powdered fuel with combustion air distributed in concentric partial flows, wherein the burner comprises a primary air pipe (6) which conducts primary air or primary gas and fuel and which is surrounded by a secondary air pipe (12) conducting secondary air, wherein the primary air pipe (6) is surrounded at the outlet end within the secondary air pipe (12) by a flow guidance device (26) which forms an annular gap (25), is open at both ends, is flowed through by a secondary air and projects in axial direction beyond the primary air pipe (6) by an amount, characterised thereby that the amount corresponds to up to 25% of the outer diameter of the primary air pipe (6), that the width of the annular gap (25) is equal to at least 1.5% of the outer diameter of the primary air pipe (6) and that a throttle ring (30), which is axially displaceable as far as into the inlet cross-section of the flow guidance device (26), is arranged on the primary air pipe (6).
  2. Burner according to claim 1, characterised thereby that the flow guidance device (26) is supported on the primary air pipe (6) by way of support segments (29) which in the flow direction of the secondary air are arranged at an angle of at most 80°.
  3. Burner according to one of claims 1 and 2, characterised thereby that the flow guidance device (26) is provided with an outflow segment (28) which forms an outflow angle of at most 25° with the burner longitudinal axis (1).
  4. Burner according to one of claims 1 to 3, characterised thereby that the flow guidance device (26) is provided with an inflow segment (27) which forms an inflow angle of at most 45° with the burner longitudinal axis (1).
  5. Burner according to one of claims 1 to 4, characterised thereby that a swirl flap crosspiece is arranged in the secondary air pipe (12) upstream of the flow guidance device (26).
  6. Burner according to claim 5, characterised thereby that the swirl flap crosspiece is adjustable.
  7. Burner according to one of claims 1 to 6, characterised thereby that a core air pipe (3) receiving an ignition oil lance (2) is arranged within the primary air pipe (6) and that a fixed or adjustable swirl vane insert (9), which is connected with a displacement body (10) fastened to the core air pipe (3), is arranged within the primary air pipe (6).
  8. Burner according to one of claims 1 to 7, characterised thereby that a device for breaking away the powder concentration in the rim region of the primary air pipe (6) is arranged at the outlet end of the primary air pipe (6).
  9. Burner according to one of claims 1 to 8, characterised thereby that the secondary air pipe (12) is surrounded by a tertiary air pipe (13) conducting tertiary air and that the secondary air pipe (12) projects beyond the tertiary air pipe (13) in axial direction.
  10. Burner according to claim 9, characterised thereby that a fixed or adjustable swirl body is arranged in the tertiary air pipe (13).
  11. Burner according to one of claims 1 to 10, characterised thereby that the flow guidance device (26) projects beyond the secondary air pipe (12) in axial direction.
  12. Burner according to claims 8 and 11, characterised thereby that the outer edges of the tertiary air pipe (13), the secondary air pipe (12) and the flow guidance device (26) lie on a circular cone surface, the apex (31) of which points in flow direction and the sector angle of which amounts to 40 to 60°.
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 EP0636836A2 (en) 1995-02-01
EP0636836A3 EP0636836A3 (en) 1995-08-09
EP0636836B1 true EP0636836B1 (en) 1998-07-29

Family

ID=6494104

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94100539A Expired - Lifetime EP0636836B1 (en) 1993-07-30 1994-01-15 Burner for burning pulverulent fuel

Country Status (9)

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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) FI104125B1 (en)
ZA (1) ZA941358B (en)

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US5829369A (en) * 1996-11-12 1998-11-03 The Babcock & Wilcox Company Pulverized coal burner
CN1095971C (en) * 1996-11-12 2002-12-11 孙键 Radial cyclone-type coal burner
DE19854390C2 (en) * 1998-11-25 2001-10-31 Messer Griesheim Gmbh Device and method for pearlite production
DK175606B1 (en) * 1999-08-06 2004-12-27 Burmeister & Wains As Burner
US6347937B1 (en) * 2000-01-21 2002-02-19 Ats Spartec Inc. Rotary kiln burner
FR2851032B1 (en) * 2003-02-06 2005-11-11 Pillard Chauffage BURNER IMPROVEMENT COMPRISING A FLAME STABILIZER AND AT LEAST TWO PRIMARY, AXIAL AND ROTATING AIR DUCTS, CONCENTRIC AROUND AT LEAST ONE FUEL SUPPLY
AU2005229668B2 (en) * 2004-11-04 2008-03-06 Babcock-Hitachi K.K. Overfiring air port, method for manufacturing air port, boiler, boiler facility, method for operating boiler facility and method for improving boiler facility
FR2887597B1 (en) * 2005-06-27 2010-04-30 Egci Pillard ANNULAR CONDUIT AND BURNER COMPRISING SUCH A CONDUCT
US7430970B2 (en) * 2005-06-30 2008-10-07 Larue Albert D Burner with center air jet
DE102005046831A1 (en) * 2005-09-29 2007-04-12 Küppersbusch Großküchentechnik GmbH Staubfeuerungsvorrichtung
CN200940831Y (en) * 2006-05-17 2007-08-29 杭州意能电力技术有限公司 Pulverized coal burner with partition
US8113824B2 (en) * 2006-06-01 2012-02-14 Babcock & Wilcox Power Generation Group, Inc. Large diameter mid-zone air separation cone for expanding IRZ
ES2576008T3 (en) * 2006-08-16 2016-07-04 The Babcock & Wilcox Company Combustion method
AU2006203560B2 (en) * 2006-08-17 2011-12-01 The Babcock & Wilcox Company Burner with center air jet
WO2010034124A1 (en) * 2008-09-29 2010-04-01 New Brunswick Power Generation Corporation System and method for burning fuel
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CN102086415B (en) * 2009-12-03 2014-08-20 通用电气公司 Feeding device and feeding method
CN101865462B (en) * 2010-06-09 2012-01-18 清华大学 Weak-cyclone primary air multi-stage separation cyclone burner
EP2643635A1 (en) * 2010-11-26 2013-10-02 Bekaert Combustion Technology B.V. Burner with secondary axial flow elements
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US20140157790A1 (en) * 2012-12-10 2014-06-12 Zilkha Biomass Power Llc Combustor assembly and methods of using same
CN103411215B (en) * 2013-08-26 2016-01-27 中节环立为（武汉）能源技术有限公司 Multidirectional jetting type vortex burner
JP6632226B2 (en) * 2015-06-12 2020-01-22 三菱日立パワーシステムズ株式会社 Burner, combustion device, boiler and burner control method
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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
DE102015111586A1 (en) 2015-07-16 2017-01-19 Mitsubishi Hitachi Power Systems Europe Gmbh Coal dust burner with electrically heated fuel nozzle
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Also Published As

Publication number Publication date
FI941806A0 (en) 1994-04-19
ZA941358B (en) 1994-09-22
EP0636836A2 (en) 1995-02-01
CN1098180A (en) 1995-02-01
DK0636836T3 (en) 1999-04-26
FI941806A (en) 1995-01-31
DE59406540D1 (en) 1998-09-03
FI104125B (en) 1999-11-15
CN1074825C (en) 2001-11-14
DE4325643A1 (en) 1995-02-02
US5651320A (en) 1997-07-29
FI104125B1 (en) 1999-11-15
ATE169101T1 (en) 1998-08-15
EP0636836A3 (en) 1995-08-09
ES2119910T3 (en) 1998-10-16

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