EP0642645B1 - Swirl adjusting device for air and combustion gases in burners - Google Patents
Swirl adjusting device for air and combustion gases in burners Download PDFInfo
- Publication number
- EP0642645B1 EP0642645B1 EP94914260A EP94914260A EP0642645B1 EP 0642645 B1 EP0642645 B1 EP 0642645B1 EP 94914260 A EP94914260 A EP 94914260A EP 94914260 A EP94914260 A EP 94914260A EP 0642645 B1 EP0642645 B1 EP 0642645B1
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- EP
- European Patent Office
- Prior art keywords
- burner
- flexible tubes
- nozzle
- adjusting device
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/008—Flow control devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
- F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
- F23D14/24—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other at least one of the fluids being submitted to a swirling motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/14—Special features of gas burners
- F23D2900/14021—Premixing burners with swirling or vortices creating means for fuel or air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/14—Special features of gas burners
- F23D2900/14241—Post-mixing with swirling means
Definitions
- the invention relates to a swirl adjustment device for air and fuel gases in burners for the combustion of pulverulent or fine-grained, liquid and / or gaseous fuels, in particular for rotary kilns with at least one primary air duct and at least one combustion nozzle.
- These air channels can either be arranged coaxially on the outside or between the fuel channels. There is usually an oil lance in the center. As a rule, the nozzle cross-sections are adjustable from the cold end of the burner.
- the swirl air duct is provided with a helical swirler at the end of the nozzle.
- Axial air nozzles are usually divergent and have an annular cross-section or are divided into several cross-sectional segments, which can be round or rectangular. Designs are also known which have a centrally arranged air duct, but which have little influence on the shape of the flame.
- the purpose of all these outflow systems is to generate a suitable air flow suitable for the flame shape from the two air flows, namely from the axial component and the swirl or radial component.
- a burner is known from DD-PS 132 022, in which the air guidance system is rigidly installed. Depending on the given arrangement, which cannot be adjusted during operation, angles of attack of up to 80 ° can be specified here, but these cannot be changed during operation.
- EP-OS 132 831 shows an injector burner in which flexible pipes are used.
- the corrugated surface of the flexible tubes which are designed as a corrugated hose, is used in order to achieve better mixing.
- Such a hose can be installed in a bent position, which can increase the turbulence. A change in the angle of attack in operation is not provided for in this training and is also not possible.
- DE-B-12 54 800 describes an oil gasification atomizing burner with a reaction chamber which has primary air openings and into which an atomizing nozzle atomizes the fuel.
- the primary air opening consists of an air nozzle that can be slid forward or backward and rotated about its own axis.
- the gasification air is introduced by pressure and flows through the carburetor in a helical swirling motion.
- the vortex movement is achieved in that the axis of each of the primary air openings on its part lying outside the burner housing cover is bent downward at the same fixed angle in the direction of the atomizer axis on the one hand and on the other hand the nozzles are also bent at a fixed angle of different size in the lateral direction are bent.
- primary air openings or nozzles of different lengths or different degrees of bending can be used.
- the swirl adjusting device essentially consists in that the primary air duct contains a plurality of flexible pipes, the ends of which facing away from the burner nozzle can be rotated concentrically to the axis of the burner and / or are displaceable in the axial direction of the burner, and whose ends facing the burner nozzle in the axial direction the burner are slidably and pivotably mounted.
- the ends facing the burner nozzle can only be pivoted if the ends facing away from the burner nozzle are slidably mounted in the axial direction of the burner, and in this case too, due to the flexibility of the pipes, a displacement of the ends of the flexible pipes facing away from the burner nozzle occurs when the Ends of the tubes facing the burner nozzle are only pivotably mounted, which leads to a change in the exit angle, since the rise in the helical lines in turn changes.
- the design can be such that the storage of the free ends of the flexible tubes is formed by slots or elongated holes extending in the longitudinal direction thereof, which cooperate with bolts which are essentially radial to the burner axis, thereby creating the desired kinematics for adjusting the flexible ones Pipes with a simple common drive is guaranteed.
- the drive can attack a common part, which is designed as a support, the design advantageously being such that the ends of the flexible tubes facing away from the burner nozzle are fixed in an annular disk-shaped support, which has a drive for rotating the support and / or is connected to move the carrier in the direction of the burner axis.
- the drive can be formed by a simple hydraulic drive if only an axial displacement of the annular disk-shaped carrier is required in order to influence the exit angle from the flexible tubes.
- Rotation of the carrier can be effected both with such a displacement drive if the carrier itself is rotatably guided in helical grooves, and thus at the same time the carrier is rotated with an axial displacement of the carrier.
- the free ends of the flexible tubes must be displaceable and rotatable in the axial direction, for which, as mentioned above, the longitudinal slots or elongated holes can be provided together with radial bolts.
- a rotary drive can contain, for example, a toothed sleeve, the teeth of which mesh with a drive pinion.
- the design is such that the flexible pipes open into a region of the primary air duct with an annular cross section, and that the primary air duct tapers into an annular nozzle after the mouth of the flexible pipes.
- the desired rotation of the air flow, and consequently the flame shape can be set precisely and in a user-friendly manner by means of an adjustment device with an indicator scale attached to the cold end of the burner.
- FIG. 1 shows a view of the swirl adjustment device, partly in section
- FIG. 2 shows an axial section through the configuration according to FIG. 1 with the axial orientation of the flexible tubes.
- the flexible swirl setting device is located in a circular primary air duct 1 about 0.5 m from a burner discharge nozzle 2.
- a circular primary air duct 1 about 0.5 m from a burner discharge nozzle 2.
- approximately 9 to 18 flexible tubes 3 with a length of approximately 350 mm are arranged in a planetary manner in the circular ring channel 1.
- the front ends 4 of these flexible tubes are rotatably and axially slidably attached.
- the rear part of the hoses or tubes 3 is contained in a ring 5 which is rotatably mounted about the axis of the burner.
- the ring 5 is rotated via the rotatable sleeve 6, which has external teeth, a pinion 7 of a drive shaft (not shown) meshing with this external toothing.
- the ends 4 of the flexible tubes facing the burner nozzle 2 open into a rotation chamber 8 which is arranged directly in front of the outlet nozzle 2.
- the flexible tubes 3 When the ring 5 is rotated, the flexible tubes 3 nestle helically against the inner tube 11, the free ends 4 of the flexible tubes being deflected relative to the burner axis 9 depending on the angle of rotation of the ring. Since the rotatable ring 5 is mounted almost tightly between the inner tube 11 and the outer tube 10, the air flows through the flexible tubes 3 into the rotation chamber 8. In this rotation chamber 8, the rotation takes place as a function of the deflection angle of the ends 4 of the flexible tubes. The ring 5 is rotated from the cold end of the burner.
- the outer tube of the burner is designated by 10.
- the rotatable sleeve 6 is slidably mounted on the inner tube 11.
- the free ends 4 of the flexible tubes 3 have a slot 12 running in the axial direction, in which a bolt 13 engages.
Abstract
Description
Die Erfindung bezieht sich auf eine Dralleinstellvorrichtung für Luft und Brenngase in Brennern für die Verbrennung pulverförmiger oder feinkörniger, flüssiger und/oder gasförmiger Brennstoffe, inbbesondere für Drehrohröfen mit wenigstens einem Primarluftkanal und wenigstens einer Brenndüse.The invention relates to a swirl adjustment device for air and fuel gases in burners for the combustion of pulverulent or fine-grained, liquid and / or gaseous fuels, in particular for rotary kilns with at least one primary air duct and at least one combustion nozzle.
Um bei Drehrohrofenbrennern die Flammenform mittels der Primarluft zu beeinflussen, sind moderne Brenner in der Regel mit zwei Primarluftkanalen ausgestattet.In order to influence the flame shape in rotary kiln burners by means of the primary air, modern burners are usually equipped with two primary air channels.
Diese Luftkanale können entweder koaxial außen oder zwischen den Brennstoffkanalen angeordnet sein. Zentral befindet sich zumeist eine Öllanze. In der Regel sind die Düsenquerschnitte vom kalten Ende des Brenners verstellbar ausgeführt. Der Dralluftkanal ist am Düsenende mit einem schraubenförmigen Wirbler versehen. Axialluftdüsen sind zumeist divergent ausgeführt und haben einen kreisringförmigen Querschnitt bzw. sind in mehrere Querschnittsegmente, die rund oder rechteckig sein können, unterteilt. Auch sind Bauformen bekannt, die einen zentrisch angeordneten Luftkanal besitzen, der aber kaum Einfluß auf die Flamenform besitzt.These air channels can either be arranged coaxially on the outside or between the fuel channels. There is usually an oil lance in the center. As a rule, the nozzle cross-sections are adjustable from the cold end of the burner. The swirl air duct is provided with a helical swirler at the end of the nozzle. Axial air nozzles are usually divergent and have an annular cross-section or are divided into several cross-sectional segments, which can be round or rectangular. Designs are also known which have a centrally arranged air duct, but which have little influence on the shape of the flame.
Sinn und Zweck all dieser Ausströmsysteme ist es, aus den beiden Luftströmen, namlich aus der Axialkomponente und der Drall- bzw. Radialkomponente, einen für die Flammenform geeigneten resultierenden Luftstrom zu erzeugen.The purpose of all these outflow systems is to generate a suitable air flow suitable for the flame shape from the two air flows, namely from the axial component and the swirl or radial component.
Weiters sind Konstruktionen mit verstellbaren Drallschaufeln sowie Konstruktionen von axial verschiebbaren konischen Wirblern bzw. Dralleinrichtungen bekannt.Furthermore, constructions with adjustable swirl blades as well as constructions of axially displaceable conical whirlers or swirl devices are known.
Aus der DE-PS 2 127 474 ist ein Brenner mit starr abgewinkelten Brenngasdüsen bekannt geworden, welche mit Hilfe von Klemmschrauben in ihrer Position gehalten werden. Eine Dralleinstellung ist bei einer derartigen Ausbildung dadurch möglich, daß jede der Düsen einzeln nach Lösen der Klemmschrauben verstellt wird, wobei eine derartige Verstellung nur von der heißen Seite des Brenners erfolgen kann. Daraus resultiert, daß der Brenner zum Zweck der Drallverstellung abgestellt, abgekühlt und ausgebaut werden muß.From DE-PS 2 127 474 a burner with rigidly angled fuel gas nozzles has become known, which are held in position by means of clamping screws. A swirl setting is possible with such a design that each of the nozzles is individually adjusted after loosening the clamping screws, such an adjustment can only be made from the hot side of the burner. The result of this is that the burner must be switched off, cooled and removed for the purpose of swirl adjustment.
Aus der DD-PS 132 022 ist ein Brenner bekannt geworden, bei welchem das Luftführungssystem starr eingebaut ist. Je nach vorgegebener, aber im Betrieb unverstellbarer Anordnung lassen sich hier Anstellwinkel bis zu 80° vorgeben, welche jedoch im Betrieb nicht verändert werden können.A burner is known from DD-PS 132 022, in which the air guidance system is rigidly installed. Depending on the given arrangement, which cannot be adjusted during operation, angles of attack of up to 80 ° can be specified here, but these cannot be changed during operation.
Der EP-OS 132 831 ist ein Injektorbrenner zu entnehmen, bei welchem flexible Rohre eingesetzt werden. Bei einer derartigen Ausbildung wird die gewellte Oberfläche der flexiblen Rohre, welche als Ringwellenschlauch ausgebildet sind, ausgenützt, um eine bessere Durchmischung zu erzielen. Ein derartiger Schlauch kann in abgeknickter Lage eingebaut werden, wodurch die Turbulenzen verstärkt werden können. Eine Veränderung des Anstellwinkels ist im Betrieb bei dieser Ausbildung nicht vorgesehen und auch nicht möglich.EP-OS 132 831 shows an injector burner in which flexible pipes are used. With such a design, the corrugated surface of the flexible tubes, which are designed as a corrugated hose, is used in order to achieve better mixing. Such a hose can be installed in a bent position, which can increase the turbulence. A change in the angle of attack in operation is not provided for in this training and is also not possible.
In der DE-B-12 54 800 ist ein Ölvergasungs-zerstäubungsbrenner mit einer Reaktionskammer, welche Primärluftöffnungen aufweist und in die hinein eine Zerstäuberdüse den Brennstoff zerstäubt, beschrieben. Die Primärluftöffnung besteht hierbei aus einer etwas nach vorne oder hinten gleitbare und um die eigene Achse verdrehbaren Luftdüse. Die Vergasungsluft wird hierbei durch Druck eingeführt und strömt in einer schraubengangförmigen Wirbelbewegung durch den Vergaser. Die Wirbelbewegung wird hierbei dadurch erreicht, daß die Achse jeder der Primärluftöffnungen an ihrem außerhalb des Brennergehäusedeckels liegenden Teil einerseits in einem gleichen festliegenden Winkel in Richtung auf die Zerstäuberachse nach unten gebogen ist und andererseits die Düsen ebenfalls in einem festliegenden Winkel von abweichender Größe auch in Seitenrichtung gebogen sind. Entsprechend den jeweiligen betrieblichen Erfordernissen können Primärluftöffnungen bzw. Düsen von unterschiedlicher Länge oder unterschiedlichem Biegungsgrad eingesetzt werden.DE-B-12 54 800 describes an oil gasification atomizing burner with a reaction chamber which has primary air openings and into which an atomizing nozzle atomizes the fuel. The primary air opening consists of an air nozzle that can be slid forward or backward and rotated about its own axis. The gasification air is introduced by pressure and flows through the carburetor in a helical swirling motion. The vortex movement is achieved in that the axis of each of the primary air openings on its part lying outside the burner housing cover is bent downward at the same fixed angle in the direction of the atomizer axis on the one hand and on the other hand the nozzles are also bent at a fixed angle of different size in the lateral direction are bent. Depending on the respective operational requirements, primary air openings or nozzles of different lengths or different degrees of bending can be used.
Die Erfindung zielt nun darauf ab, eine Einrichtung der eingangs genannten Art zu schaffen, mit welchem während des Betriebes die Flammenführung optimiert werden kann, und eine besonders ruhige Flammenführung durch homogene Einmischung der Luft in den Brennstoff erzielt werden kann. Zur Lösung dieser Aufgabe besteht die erfindungsgemäße Dralleinstellvorrichtung im wesentlichen darin, daß der Primärluftkanal eine Mehrzahl flexibler Rohre enthält, deren der Brennerdüse abgewandte Enden konzentrisch zur Achse des Brenners verdrehbar und/oder in Achsrichtung des Brenners verschiebbar gelagert sind und deren der Brennerdüse zugewandte Enden in Achsrichtung des Brenners verschieblich und schwenkbar gelagert sind. Auf diese Weise wird ein koaxialer, kreisringförmiger Luftstrom in Teilströme zerlegt, wobei die axialen Teilluftströme stufenlos in eine gewünschte Rotation versetzt werden können, wodurch die Flammenform in geeigneter Weise beeinflußt werden kann. Es wird hiefür nur ein einziger Luftkanal benötigt, wobei der Vorteil einer derartigen Konstruktion verbrennungstechnisch auf einer ruhigeren Flammenführung durch homogenere Einmischung der Luft in den Brennstoff, verglichen mit herkömmlichen Düsensystemen, besteht, bei welchen sich zwei Luftströme in einer Weise gegenseitig beeinflussen, daß ein resultierender Luftstrom erzeugt wird. Die Strömungsverluste gegenüber mit Axial- und Radialluftkanälen ausgestatteten Brennern sind hiebei wesentlich geringer, da die Kreisringoberfläche bei einem Luftkanal naturgemäß geringer ist als bei zwei Kanälen. Es können somit Primärluftventilatoren, die den Brenner anspeisen, mit einem wesentlich geringerem Druckpotential verwendet werden, wodurch eine beträchtliche Energieeinsparung bewirkt wird. Dadurch, daß die Mehrzahl flexibler Rohre an ihrer einen Seite verdrehbar und/oder in Achsrichtung des Brenners verschieblich gelagert sind und an ihren der Brennerdüse zugewandten Enden in Achsrichtung des Brenners verschieblich und schwenkbar gelagert sind, lassen sich durch einfache Maßnahmen die Anstellwinkel der einzelnen Teilströme verändern. Wenn hiebei die der Brennerdüse abgewandten Enden um die Achse des Brenners verdreht werden, müssen die der Brennerdüse zugewandten Enden in Achsrichtung des Brenners verschieblich gelagert sein, da eine derartige Verdrehung den Anstieg der Schraubenlinie verändert, längs welcher die einzelnen flexiblen Schläuche verlaufend angeordnet sind. Umgekehrt können die der Brennerdüse zugewandten Enden lediglich schwenkbar gelagert sein, wenn die der Brennerdüse abgewandten Enden in Achsrichung des Brenners verschieblich gelagert sind, wobei auch in diesem Fall aufgrund der Flexiblilität der Rohre eine Verschiebung der der Brennerdüse abgewandten Enden der flexiblen Rohre dann, wenn die der Brennerdüse zugewandten Enden der Rohre lediglich schwenkbar gelagert sind, zu einer Veränderung des Austrittswinkel führt, da sich der Anstieg der Schraubenlinien wiederum verändert.The invention now aims to provide a device of the type mentioned at the beginning, with which the flame control can be optimized during operation, and a particularly quiet flame control can be achieved by homogeneously mixing the air into the fuel. To achieve this object, the swirl adjusting device according to the invention essentially consists in that the primary air duct contains a plurality of flexible pipes, the ends of which facing away from the burner nozzle can be rotated concentrically to the axis of the burner and / or are displaceable in the axial direction of the burner, and whose ends facing the burner nozzle in the axial direction the burner are slidably and pivotably mounted. In this way, a coaxial, annular air stream is broken down into partial streams, the axial partial air streams being able to be set continuously into a desired rotation, as a result of which the shape of the flame can be influenced in a suitable manner. Only a single air duct is required for this, the advantage of such a design in terms of combustion technology being a quieter flame guidance through more homogeneous mixing of the air into the fuel, compared to conventional nozzle systems, in which two air flows mutually influence one another in such a way that a resulting one Airflow is generated. The flow losses compared to burners equipped with axial and radial air ducts are significantly lower since the circular ring surface is naturally smaller in one air duct than in two ducts. Primary air fans which feed the burner can therefore be used with a substantially lower pressure potential, which results in considerable energy savings. Characterized in that the plurality of flexible tubes are rotatable on one side and / or slidably mounted in the axial direction of the burner and on their Ends facing the burner nozzle are displaceable and pivotable in the axial direction of the burner, the angle of attack of the individual partial flows can be changed by simple measures. If the ends facing away from the burner nozzle are rotated about the axis of the burner, the ends facing the burner nozzle must be displaceable in the axial direction of the burner, since such twisting changes the increase in the helix along which the individual flexible hoses are arranged to run. Conversely, the ends facing the burner nozzle can only be pivoted if the ends facing away from the burner nozzle are slidably mounted in the axial direction of the burner, and in this case too, due to the flexibility of the pipes, a displacement of the ends of the flexible pipes facing away from the burner nozzle occurs when the Ends of the tubes facing the burner nozzle are only pivotably mounted, which leads to a change in the exit angle, since the rise in the helical lines in turn changes.
In besonders einfacher Weise kann die Ausbildung hiebei so getroffen sein, daß die Lagerung der freien Enden der flexiblen Rohre von in Längsrichtung derselben verlaufenden Schlitzen oder Langlöchern gebildet ist, welche mit zur Brennerachse im wesentlichen radialen Bolzen zusammenwirken, wodurch die gewünschte Kinematik der Verstellung der flexiblen Rohre mit einem einfachen gemeinsamen Antrieb gewährleistet ist. Der Antrieb kann hiebei an einem gemeinsamen Teil angreifen, welcher als Träger ausgebildet ist, wobei die Ausbildung mit Vorteil so getroffen ist, daß die der Brennerdüse abgewandten Enden der flexiblen Rohre in einem ringscheibenförmigen Träger festgelegt sind, welcher mit einem Antrieb zum Verdrehen des Trägers und/oder zum Verschieben des Trägers in Richtung der Brennerachse verbunden ist. Bei einer derartigen Ausbildung kann der Antrieb von einem einfachen hydraulischen Antrieb gebildet werden, wenn lediglich eine axiale Verschiebung des ringscheibenförmigen Trägers erforderlich ist, um den Austrittswinkel aus den flexiblen Rohren zu beeinflussen. Ein Verdrehen des Trägers kann sowohl mit einem derartigen Verschiebeantrieb bewirkt werden, wenn der Träger selbst in schraubenlinienförmigen Nuten verdrehbar geführt ist, und somit gleichzeitig mit einer axialen Verschiebung des Trägers auch ein Verdrehen des Trägers erfolgt. Wenn lediglich eine Verdrehung des gemeinsamen Trägers erfolt, müssen die freien Enden der flexiblen Rohre in Achsrichtung verschieblich und verdrehbar gelagert sein, wofür, wie oben erwähnt, die in Längsrichtung verlaufenden Schlitze oder Langlöcher gemeinsam mit radialen Bolzen vorgesehen sein können. Ein Drehantrieb kann beispielsweise eine gezahnte Hülse enthalten, deren Zahnung mit einem Antriebsritzel kämmt.In a particularly simple manner, the design can be such that the storage of the free ends of the flexible tubes is formed by slots or elongated holes extending in the longitudinal direction thereof, which cooperate with bolts which are essentially radial to the burner axis, thereby creating the desired kinematics for adjusting the flexible ones Pipes with a simple common drive is guaranteed. The drive can attack a common part, which is designed as a support, the design advantageously being such that the ends of the flexible tubes facing away from the burner nozzle are fixed in an annular disk-shaped support, which has a drive for rotating the support and / or is connected to move the carrier in the direction of the burner axis. With such a design, the drive can be formed by a simple hydraulic drive if only an axial displacement of the annular disk-shaped carrier is required in order to influence the exit angle from the flexible tubes. On Rotation of the carrier can be effected both with such a displacement drive if the carrier itself is rotatably guided in helical grooves, and thus at the same time the carrier is rotated with an axial displacement of the carrier. If only the common carrier is twisted, the free ends of the flexible tubes must be displaceable and rotatable in the axial direction, for which, as mentioned above, the longitudinal slots or elongated holes can be provided together with radial bolts. A rotary drive can contain, for example, a toothed sleeve, the teeth of which mesh with a drive pinion.
In weiterer Verbesserung der strömungstechnischen Vorteile der erfindungsgemäßen Einrichtung ist die Ausbildung so getroffen, daß die flexiblen Rohre in einen Bereich des Primärluftkanales mit kreisringförmigem Querschnitt münden, und daß sich der primärluftkanal im Anschluß an die Mündung der flexiblen Rohre zu einer Ringdüse verjüngt.In a further improvement of the aerodynamic advantages of the device according to the invention, the design is such that the flexible pipes open into a region of the primary air duct with an annular cross section, and that the primary air duct tapers into an annular nozzle after the mouth of the flexible pipes.
Bei der Fertigung von Brennern mit nur einem Luftkanal in Verbindung mit der flexiblen Dralleinstellvorrichtung entfällt ein Luftkanal mit den entsprechenden Düseneinbauten, Anschlußstutzen etc., was zu einer Produktionskosten- und Gewichtseinsparung führt.When producing burners with only one air duct in connection with the flexible swirl setting device, there is no air duct with the corresponding nozzle internals, connecting pieces etc., which leads to a saving in production costs and weight.
Durch eine am kalten Ende des Brenners angebrachte Verstelleinrichtung mit Anzeigerskala läßt sich exakt und bedienungsfreundlich die gewünschte Rotation des Luftstromes, und somit in der Folge die Flammenform einstellen.The desired rotation of the air flow, and consequently the flame shape, can be set precisely and in a user-friendly manner by means of an adjustment device with an indicator scale attached to the cold end of the burner.
Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispieles näher erläutert. In dieser zeigen Fig.1 eine Ansicht der Dralleinstellvorrichtung teilweise im Schnitt und Fig.2 einen Axialschnitt durch die Ausbildung nach Fig.1 bei im wesentlichen axialer Ausrichtung der flexiblen Rohre.The invention is explained in more detail below on the basis of an exemplary embodiment shown schematically in the drawing. 1 shows a view of the swirl adjustment device, partly in section, and FIG. 2 shows an axial section through the configuration according to FIG. 1 with the axial orientation of the flexible tubes.
Die flexible Dralleinstellvorrichtung befindet sich in einem kreisringförmigen Primärluftkanal 1 etwa 0,5 m von einer Brennerausströmdüse 2 entfernt. In dem Kreisringkanal 1 sind je nach Luftleistung etwa 9 bis 18 flexible Rohre 3 mit einer Länge von ca. 350 mm am Umfang planetenartig angeordnet. Die vorderen Enden 4 dieser flexiblen Rohre sind drehbar und axial verschiebbar befestigt. Der rückwärtige Teil der Schläuche bzw. Rohre 3 ist in einem Ring 5 gefaßt, welcher um die Achse des Brenners drehbar gelagert ist.The flexible swirl setting device is located in a circular
Die Verdrehung des Ringes 5 erfolgt über die eine Außenverzahnung aufweisende drehbare Hülse 6, wobei mit dieser Außenverzahnung ein Ritzel 7 einer nicht dargestellten Antriebswelle kämmt.The
Die der Brennerdüse 2 zugewandten Enden 4 der flexiblen Rohre münden in eine Rotationskammer 8, welche unmittelbar vor der Austrittsdüse 2 angeordnet ist.The
Wenn der Ring 5 verdreht wird, schmiegen sich die flexiblen Rohre 3 schraubenlinienförmig an das Innenrohr 11 an, wobei je nach Verdrehwinkel des Ringes die freien Enden 4 der flexiblen Rohre gegenüber der Brennerachse 9 ausgelenkt werden. Da der drehbare Ring 5 nahezu dicht zwischen dem Innenrohr 11 und dem Außenrohr 10 gelagert ist, strömt die Luft durch die flexiblen Rohre 3 in die Rotationskammer 8. In dieser Rotationskammer 8 erfolgt die Rotation in Abhangigkeit vom Auslenkwinkel der Enden 4 der flexiblen Rohre. Die Verdrehung des Ringes 5 erfolgt vom kalten Ende des Brenners aus.When the
Bei der Darstellung nach Fig.2 ist das Außenrohr des Brenners mit 10 bezeichnet. Die drehbare Hülse 6 ist gleitend am Innenrohr 11 gelagert. Die freien Enden 4 der flexiblen Rohre 3 weisen einen in Achsrichtung verlaufenden Schlitz 12 auf, in welchen ein Bolzen 13 eingreift. Bei einer derartigen Ausbildung kann bei einer Verdrehung des ringförmigen Tragers 5 und einer Veranderung der Steigung der Schraubenlinie der flexiblen Rohre 3 ein Längenausgleich im Bereich der vorderen Enden 4 erfolgen, wobei dann, wenn der Ausströmwinkel zur Achse zunimmt, eine entsprechende Verkürzung und damit eine entsprechende Verschiebung der freien Enden 4 in der durch den Schlitz 12 und den Bolzen 13 gebildeten Führung erfolgt. Wenn anstelle eines derartigen Schlitzes 12 eine einfache Bohrung für den Eingriff des Bolzens 13 vorgesehen ware, würde eine Beaufschlagung des ringförmigen Tragers 5 in Achsrichtung genügen, um gleichfalls eine Verschwenkung der freien Enden 4 der flexiblen Rohre 3 zur Achse 9 des Brenners zu erzielen. In Fig.2 ist die Brennerlanze mit 14 bezeichnet.In the illustration according to FIG. 2, the outer tube of the burner is designated by 10. The
Claims (4)
- A swirl adjusting device for air and combustion gases to be used in a burner for burning powdery or fine-grained, liquid and/or gaseous fuels, in particular a rotary tubular kiln comprising at least one primary air channel (1) and at least one burning nozzle (2), characterized in that the primary air channel contains a plurality of flexible tubes (3) whose ends facing away from the burner nozzle (2) are mounted so as to be rotatable concentrical with the axis of the burner and/or displaceable in the axial direction of the burner and whose ends (4) facing the burner nozzle (2) are mounted so as to be displaceable in the axial direction of the burner and pivotable.
- A swirl adjusting device according to claim 1, characterized in that said mounting of the free ends of the flexible tubes (3) is provided by slots (12), or long holes, extending in the longitudinal direction thereof and cooperating with bolts (13) that are substantial radial relative to the burner axis (9).
- A swirl adjusting device according to claims 1 and 2, characterized in that the ends of the flexible tubes facing away from the burner nozzle (2) are fixed in an annular disc-shaped carrier (5), which is connected with an actuating means for rotating said carrier (5) and/or displacing said carrier (5) in the direction of the burner axis.
- A swirl adjusting device according to claim 1, 2 or 3, characterized in that the flexible tubes (3) open into a region of the primary air channel (1) having circular cross section and that the primary air channel (1) tapers to an annular nozzle (2) following said opening of the flexible tubes.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT59993 | 1993-03-25 | ||
| AT599/93 | 1993-03-25 | ||
| PCT/AT1994/000031 WO1994021963A1 (en) | 1993-03-25 | 1994-03-23 | Swirl adjusting device for air and combustion gases in burners |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0642645A1 EP0642645A1 (en) | 1995-03-15 |
| EP0642645B1 true EP0642645B1 (en) | 1997-06-11 |
Family
ID=3494850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94914260A Expired - Lifetime EP0642645B1 (en) | 1993-03-25 | 1994-03-23 | Swirl adjusting device for air and combustion gases in burners |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0642645B1 (en) |
| AT (1) | ATE154427T1 (en) |
| DE (1) | DE59403095D1 (en) |
| WO (1) | WO1994021963A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004010063A1 (en) * | 2004-03-02 | 2005-09-22 | Khd Humboldt Wedag Ag | Rotary kiln burner |
| WO2007054271A1 (en) * | 2005-11-11 | 2007-05-18 | Khd Humboldt Wedag Gmbh | Rotary furnace burner |
| DE102007060090A1 (en) | 2007-01-09 | 2008-07-17 | Unitherm Cemcom Feuerungsanlagen Gmbh | Burner for rotary kiln in cement industry, has tangential openings in connection with fuel channel in one displaced position, and axial circular opening enabled concentrically to fuel channel in another displaced position |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA211493A (en) * | 1993-10-20 | 1996-07-15 | Unitherm Oesterreich Gmbh | BURNER |
| DE19648981B4 (en) * | 1996-11-26 | 2007-02-15 | Polysius Ag | burner |
| DE19850940A1 (en) * | 1998-11-05 | 2000-05-31 | Messer Austria Gmbh Gumpoldski | Swirl burner |
| BR112012018834B1 (en) * | 2009-12-24 | 2022-09-27 | Changzheng Engineering Co., Ltd | FUEL DISTRIBUTION DEVICE AND BURNER |
| EP2362139A1 (en) * | 2010-02-18 | 2011-08-31 | Haldor Topsoe A/S | Burner |
| CN104390213A (en) * | 2014-11-12 | 2015-03-04 | 宁夏嘉翔自控技术有限公司 | Coal injection duct set for pulverized coal burner of magnesium metal reduction furnace |
| CN110848692B (en) * | 2019-10-08 | 2020-10-27 | 西安交通大学 | Air shunting spinning part premixing dual-fuel low NOx burner |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB609135A (en) * | 1946-03-06 | 1948-09-27 | William Lelgemann | Improvements in or relating to fluid fuel burners |
| DE1254800B (en) * | 1958-02-10 | 1967-11-23 | Karoly Peredi Dipl Ing Dr | Oil gasification atomization burner |
| AT289631B (en) * | 1969-06-03 | 1971-04-26 | Oesterr Amerikan Magnesit | Injection pipe for the supply of the combustion air required for the combustion of heavy oil in rotary kilns |
| WO1990012987A1 (en) * | 1989-04-21 | 1990-11-01 | Siemens Aktiengesellschaft | Device for feeding combustible materials and additives in burner installations |
-
1994
- 1994-03-23 AT AT94914260T patent/ATE154427T1/en active
- 1994-03-23 WO PCT/AT1994/000031 patent/WO1994021963A1/en active IP Right Grant
- 1994-03-23 DE DE59403095T patent/DE59403095D1/en not_active Expired - Lifetime
- 1994-03-23 EP EP94914260A patent/EP0642645B1/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004010063A1 (en) * | 2004-03-02 | 2005-09-22 | Khd Humboldt Wedag Ag | Rotary kiln burner |
| WO2007054271A1 (en) * | 2005-11-11 | 2007-05-18 | Khd Humboldt Wedag Gmbh | Rotary furnace burner |
| DE102007060090A1 (en) | 2007-01-09 | 2008-07-17 | Unitherm Cemcom Feuerungsanlagen Gmbh | Burner for rotary kiln in cement industry, has tangential openings in connection with fuel channel in one displaced position, and axial circular opening enabled concentrically to fuel channel in another displaced position |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1994021963A1 (en) | 1994-09-29 |
| EP0642645A1 (en) | 1995-03-15 |
| ATE154427T1 (en) | 1997-06-15 |
| DE59403095D1 (en) | 1997-07-17 |
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