EP1714081A1 - Premixing burner arrangement for operating a burner chamber and method for operating a burner chamber - Google Patents

Premixing burner arrangement for operating a burner chamber and method for operating a burner chamber

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Publication number
EP1714081A1
EP1714081A1 EP05726413A EP05726413A EP1714081A1 EP 1714081 A1 EP1714081 A1 EP 1714081A1 EP 05726413 A EP05726413 A EP 05726413A EP 05726413 A EP05726413 A EP 05726413A EP 1714081 A1 EP1714081 A1 EP 1714081A1
Authority
EP
European Patent Office
Prior art keywords
wall
flow
premix burner
swirl
burner according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05726413A
Other languages
German (de)
French (fr)
Other versions
EP1714081B1 (en
Inventor
Elena De Marcos
Christian Steinbach
Nicolas Ulibari
Martin Andrea Von Planta
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.)
General Electric Technology GmbH
Original Assignee
Alstom Technology AG
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Publication date
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Publication of EP1714081A1 publication Critical patent/EP1714081A1/en
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Publication of EP1714081B1 publication Critical patent/EP1714081B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • F23D17/002—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or liquid fuel
    • 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 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/07002—Premix burners with air inlet slots obtained between offset curved wall surfaces, e.g. double cone burners

Definitions

  • the invention relates to a premix burner for operating a combustion chamber with a gaseous and / or liquid fuel with a swirl generator for a combustion supply air flow to form a swirl flow and means for injecting fuel into the swirl flow, the swirl generator having at least two partial cone shells which complement one another to form a flow body which together enclose a conical swirl chamber with a cone angle y and tangential air inlet slots in the longitudinal direction of the cone.
  • Premix burners of the aforementioned type are known from a large number of previously published documents, for example from EP 0210462 A1 and EP 0 321 809 B1, to name just a few.
  • Premix burners of this type are based on the general principle of operation, within a swirl generator, which is usually designed as a cone and which provides at least two partial cone shells with corresponding mutual overlap, to produce a swirl flow consisting of a fuel-air mixture, which is formed within a combustion chamber following the premix burner under formation a premixing flame which is as stable as possible is ignited becomes.
  • the spatial position of the premixing flame is determined by the aerodynamic behavior of the swirl flow, the swirl number of which increases with increasing propagation along the burner axis, so that it becomes unstable and ultimately bursts due to an unstable cross-sectional transition between burner and combustion chamber into an annular swirl flow with the formation of a backflow zone in the latter , the premixing flame forms in the direction of flow at the front.
  • the aerodynamic stability of the backflow zone that forms is of particular importance, but depends in a highly sensitive manner on the design, shape and size of the swirl generator. If, for example, it is not possible to spatially stabilize the foremost front of the backflow zone that is formed in the direction of flow, thermoacoustic oscillations or pulsations occur increasingly within the combustion system, which significantly impair the entire combustion and the heat release.
  • premix burner systems are limited to sizes whose maximum burner diameter at the burner outlet is only 180 mm.
  • Such premix burners also have a relatively pointed, i.e. small cone angle of less than or equal to 18 °, so that the burner length is rather large in relation to the downstream burner diameter, but is still quite manageable for assembly and maintenance purposes.
  • multiple burner arrangements have been used so far, which provide for the use of the above premix burners.
  • Such multiple burner arrangements can be found, for example, in DE 4223 828 A1 or DE 44 12 315 A1.
  • a sophisticated arrangement of the large number of premix burners, each serving as a main or pilot burner is required in order to ultimately be able to operate the combustion chamber with the lowest possible emission values in the entire load range.
  • Premix burner arrangements are also known (for example US 5,588,826) which, in contrast to the premix burner described above, have a transition geometry interposed between the swirl generator and the combustion chamber, for example in the form of a hollow cylindrical mixing tube.
  • transition geometries are extremely aerodynamically sensitive, since flow separations in this zone can lead to a flashback or self-ignition.
  • Such transition geometries also make a decisive contribution to the production costs due to their complex production.
  • the invention is based on the object of developing a premix burner in accordance with the features of the preamble of claim 1 in such a way that, despite enlarging the burner dimensions, the burner properties which have been optimized in previously known premix burners are to be maintained almost unchanged. It is therefore necessary to increase the burner size of previously known premix burner systems in order to reduce the number of burners in multiple burner arrangements, as described at the beginning, and also to reduce the system costs associated therewith. It should also be possible with the larger premix burner systems to replace previously known diffusion single burners, such as those used for firing silo combustion chambers, by a single premix burner.
  • a premix burner is developed in such a way that, at least at the downstream end region of the swirl generator, a shaped element enclosing the partial cone shells with a Partial conical shells facing inner wall is provided, and that the partial conical shells run out flush with the shape of the inner wall.
  • shape-preserving means that the part-conical shape of the partial cone shells remains unchanged in the region of contact with the inner wall of the shaped element surrounding the partial cone shells, as if the partial cone shells penetrated the shaped element radially outward unhindered.
  • the inner wall of the shaped element also serves to form a flow channel downstream of the partial cone shells.
  • this is also used as a mixing tube or as a joining element, in the sense of a flange piece, by means of which the swirl generator is connected to an in Direction of flow downstream combustion chamber, such as a silo combustion chamber, or another channel structure can be connected.
  • cone angles of at least 11 °, but preferably in the range of 20 ° and larger are used, under which the partial cone shells surround the swirl space in a conically widening manner. This enables burners with a burner diameter in the outlet area of, for example, greater than 500 mm to be made possible, which have a burner length well below one meter.
  • FIG. 5 sectional view through a premix burner with a frustoconical shaped element
  • FIG. 6 + 7 perspective view of a premix burner with a funnel-shaped inlet area having a shaped element.
  • FIGS. 1 and 2 show a perspective illustration of a premix burner, looking in the direction from the downstream side into the swirl space of a swirl generator 2 spanned by a plurality of partial cone shells 1.
  • 2 shows the same premix burner, but from a different angle, namely from the outside onto the swirl generator 2, which is spanned by eight partial cone shells 1 in the exemplary embodiment shown.
  • the further external guides with respect to the exemplary embodiment shown in FIGS. 1 and 2 are made uniformly, so that no further distinction is made between FIGS. 1 and 2.
  • the premix burner shown has a central receiving unit 3, which is designed in the form of a receiving sleeve and is provided for inserting and holding a central fuel supply unit, for example in the form of a fuel nozzle for liquid fuels or a fuel lance for a pilot flame (not shown).
  • the partial cone shells 1 connected with their upstream ends to the receiving unit 3 mutually enclose air inlet slots 4 and are positioned relative to a burner axis A running centrally through the premix burner in such a way that they limit a swirl space that widens conically in the direction of flow at a cone angle y.
  • Each individual partial cone shell 1 also has, depending on the type of fuel, at least one fuel feed line 5, via which fuel can be mixed into the combustion air supply stream passing through the air inlet slots 2.
  • the individual partial cone shells 1 open with their downstream end to maintain shape on an inner wall 6 of a cylindrical shaped element 7 surrounding the partial conical shells 1.
  • the individual partial cone shells 1 are connected to the inner wall 6 of the shaped element 7 along a cutting line 8, which is defined by a virtual penetration each individual partial cone shell 1 with the inner wall 6 of the cylindrical shaped element 7 results.
  • the swirl flow formed in the interior of the swirl generator 2 does not experience any disturbance after overflowing the individual partial cone shells 1.
  • a second shaped element 9 is provided, which is also hollow-cylindrical and has a larger inner diameter than the first shaped elements 7.
  • the inner diameter transition between the shaped elements 7 and 9 takes place via a discontinuous stage 10, on which the fuel supply lines 5 of each individual partial cone shell 1 adjoin.
  • the downstream contour of the shaped element 7 is cylindrical and offers the possibility of a structurally simple connection, for example with a combustion chamber (not shown) arranged according to the premix burner shown in the flow direction.
  • FIGS. 3 and 4 show a perspective view of a further embodiment of a premix burner designed according to the invention, in which, in contrast to the embodiment shown in FIGS. 1 and 2, the area of the shaped element 7 as a truncated cone section which tapers conically in the direction of flow is trained.
  • the exemplary embodiment shown in FIGS. 3 and 4 has in the region of the shaped element 7 an inner wall 6 shown hatched in the perspective representations, on which the downstream ends of the partial cone shells 1 adjoin in a shape-maintaining manner.
  • FIGS. 6 and 7 show a further exemplary embodiment of a premix burner with a shaped element 7 which provides an upstream region, the so-called inflow region 12, which has an inner wall 6 which tapers in the direction of the flow in a funnel shape.
  • the curvature of the inner wall 6 in this inflow region 12 corresponds approximately to the contour of a quarter ellipse.
  • a flow region 12 ′ adjoins within the frame of the shaped element 7 with a largely constant flow cross section, to which an inlet flange of a combustion chamber can ultimately be attached (not shown).
  • the partial cone shells 1 of the swirl generator 2 run flush with the adjacent inner wall 6 of the shaped element 7 while maintaining their partial cone shell shape, as if the partial cone shells penetrated the inner wall 6 unhindered, but the partial cone shells 1 each connect via the cutting lines 8 the inner wall 6 from.
  • the downstream end regions of the partial cone shells 1 nestle against the ellipse curvature of the inner wall 6 in this region 12.
  • each individual partial cone shell with its downstream end region maintaining shape with an inner wall of a shaped element surrounding the partial cone shells leads to the slightest irritation of the swirl flow passing through the partial cone shells.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

A premix burner is disclosed for operating a combustion chamber with a gaseous and/or liquid fuel, having a swirl generator for inducing a swirl flow in an incoming combustion air flow and a device for injecting fuel into the swirl flow, the swirl generator having at least two cone shell segments which fit together to form a flow body and together enclose a conically formed swirl space with a cone angle gamma and air inlet slits directed tangentially to the length of the cone. At least at the downstream end region of the swirl generator, a shaped element enclosing the cone shell segments with an inside wall facing the cone shell segments is provided, and that the cone shell segments end in the inside wall in a flush manner while maintaining their shape.

Description

Vormischbrenneranordnung zum Betreiben einer Brennkammer sowie Verfahren zum Betreiben einer Brennkammer Premix burner arrangement for operating a combustion chamber and method for operating a combustion chamber
Technisches GebietTechnical field
Die Erfindung bezieht sich auf einen Vormischbrenner zum Betreiben einer Brennkammer mit einem gasförmigen und/oder flüssigen Brennstoff mit einem Drallerzeuger für einen Verbrennungszuluftstrom zur Ausbildung einer Drallströmung sowie Mitteln zur Eindüsung von Brennstoff in die Drallströmung, wobei der Drallerzeuger wenigstens zwei sich zu einem Strömungskörper ergänzende Teilkegelschalen aufweist, die gemeinsam einen kegelförmig ausgebildeten Drallraum mit einem Kegelwinkel y sowie in Kegellängserstreckung tangentiale Lufteintrittsschlitze einschließen.The invention relates to a premix burner for operating a combustion chamber with a gaseous and / or liquid fuel with a swirl generator for a combustion supply air flow to form a swirl flow and means for injecting fuel into the swirl flow, the swirl generator having at least two partial cone shells which complement one another to form a flow body which together enclose a conical swirl chamber with a cone angle y and tangential air inlet slots in the longitudinal direction of the cone.
Stand der TechnikState of the art
Vormischbrenner der vorstehend genannten Gattung sind aus einer Vielzahl vorveröffentlichter Druckschriften bekannt, so bspw. aus der EP 0210462 A1 sowie der EP 0 321 809 B1 , um nur einige zu nennen. Vormischbrennern dieser Art liegt das allgemeine Wirkprinzip zugrunde, innerhalb eines zumeist als kegelförmig ausgebildeten Drallerzeugers, der wenigstens zwei mit entsprechend gegenseitiger Überlappung zusammengesetzte Teilkegelschalen vorsieht, eine aus einem Brennstoff-Luftgemisch bestehende Drallströmung zu erzeugen, die innerhalb einer in Strömungsrichtung dem Vormischbrenner nachfolgenden Brennkammer unter Ausbildung einer räumlich möglichst stabilen Vormischflamme zur Zündung gebracht wird. Hierbei ist die räumliche Lage der Vormischflamme bestimmt durch das aerodynamische Verhalten der Drallströmung, deren Drallzahl mit zunehmender Ausbreitung längs der Brennerachse zunimmt, damit instabil wird und letztlich durch einen unsteten Querschnittsübergang zwischen Brenner und Brennkammer in eine annulare Drallströmung unter Ausbildung einer Rückströmzone aufplatzt, in deren, in Strömungsrichtung vorderen Bereich sich die Vormischflamme ausbildet.Premix burners of the aforementioned type are known from a large number of previously published documents, for example from EP 0210462 A1 and EP 0 321 809 B1, to name just a few. Premix burners of this type are based on the general principle of operation, within a swirl generator, which is usually designed as a cone and which provides at least two partial cone shells with corresponding mutual overlap, to produce a swirl flow consisting of a fuel-air mixture, which is formed within a combustion chamber following the premix burner under formation a premixing flame which is as stable as possible is ignited becomes. The spatial position of the premixing flame is determined by the aerodynamic behavior of the swirl flow, the swirl number of which increases with increasing propagation along the burner axis, so that it becomes unstable and ultimately bursts due to an unstable cross-sectional transition between burner and combustion chamber into an annular swirl flow with the formation of a backflow zone in the latter , the premixing flame forms in the direction of flow at the front.
Von besonderer Bedeutung ist die aerodynamische Stabilität der sich ausbildenden Rückströmzone, die jedoch in höchst sensibler Weise vom Design, Form und Größe des Drallerzeugers abhängt. Gelingt es beispielsweise nicht, die in Strömungsrichtung vorderste Front der sich ausbildenden Rückströmzone räumlich zu stabilisieren, so treten verstärkt thermoakustische Schwingungen bzw. Pulsationen innerhalb des Verbrennungssystems auf, die die gesamte Verbrennung sowie die Wärmefreisetzung wesentlich beeinträchtigen.The aerodynamic stability of the backflow zone that forms is of particular importance, but depends in a highly sensitive manner on the design, shape and size of the swirl generator. If, for example, it is not possible to spatially stabilize the foremost front of the backflow zone that is formed in the direction of flow, thermoacoustic oscillations or pulsations occur increasingly within the combustion system, which significantly impair the entire combustion and the heat release.
Eingedenk dieser Tatsache sind die bisher bekannten und im Einsatz befindlichen Vormischbrennersysteme auf Baugrößen beschränkt, deren maximaler Brennerdurchmesser am Brenneraustritt lediglich 180 mm beträgt. Derartige Vormischbrenner weisen darüber hinaus einen verhältnismäßig spitzen, d.h. kleinen Kegelwinkel von kleiner gleich 18° auf, so dass die Brennerlänge im Verhältnis zum stromab gewandten Brennerdurchmesser eher groß, jedoch zu Montage- und Wartungszwecken noch durchaus handhabbar ist.In view of this fact, the previously known and used premix burner systems are limited to sizes whose maximum burner diameter at the burner outlet is only 180 mm. Such premix burners also have a relatively pointed, i.e. small cone angle of less than or equal to 18 °, so that the burner length is rather large in relation to the downstream burner diameter, but is still quite manageable for assembly and maintenance purposes.
Gilt es jedoch groß dimensionierte Brennkammern zu befeuern, so bedient man sich bis anhin so genannte Mehrfachbrenneranordnungen, die den Einsatz der vorstehenden Vormischbrenner vorsehen. Derartige Mehrfachbrenneranordnungen gehen beispielsweise aus der DE 4223 828 A1 oder der DE 44 12 315 A1 hervor. Zum Betreiben derartiger Mehrfachbrenneranordnungen, die beispielsweise zur Befeuerung einer Silobrennkammer geeignet sind, bedarf es einer ausgeklügelten Anordnung der Vielzahl jeweils als Haupt- oder Pilotbrenner dienenden Vormischbrenner, um letztlich die Brennkammer im gesamten Lastbereich mit möglichst geringen Emissionswerten betreiben zu können. Es besteht jedoch der Wunsch, die Komplexität und damit auch die Anzahl der einzelnen Vormischbrenner, die zur Befeuerung groß dimensionierter Brennkammern erforderlich sind, zu reduzieren, ohne dabei Qualitätseinbußen im Verbrennungsvorgang selbst in Kauf nehmen zu müssen. Darüber hinaus gilt es aus Gründen der stets strenger werdenden Umweltnormen im Hinblick auf die Reduzierung von Emissionswerten, die bis anhin im Betrieb befindlichen Diffusions- Einzelbrennem, die vornehmlich zur Befeuerung von groß dimensionierten Silobrennkammern verwendet werden, durch modernere, umweltgerechtere Brennersysteme zu ersetzen. Insbesondere im Hinblick auf die Vermeidung hoher Umrüst- sowie Neubeschaffungskosten, ist es wünschenswert, möglichst groß dimensionierte Vormischbrenner bereitzustellen, um bspw. den Betrieb derartiger groß dimensionierter Silobrennkammern mit nur einem einzigen Vormischbrenner weiterhin aufrechterhalten zu können.However, if it is necessary to fire large combustion chambers, so-called multiple burner arrangements have been used so far, which provide for the use of the above premix burners. Such multiple burner arrangements can be found, for example, in DE 4223 828 A1 or DE 44 12 315 A1. In order to operate such multiple burner arrangements, which are suitable, for example, for firing a silo combustion chamber, a sophisticated arrangement of the large number of premix burners, each serving as a main or pilot burner, is required in order to ultimately be able to operate the combustion chamber with the lowest possible emission values in the entire load range. However, there is a desire to reduce the complexity and thus also the number of individual premix burners that are required for firing large-sized combustion chambers without having to accept any loss of quality in the combustion process itself. In addition, for reasons of ever stricter environmental standards with regard to the reduction of emission values, it is necessary to replace the single diffusion burners that have been in operation until now, which are mainly used to fire large-sized silo combustion chambers, with more modern, more environmentally friendly burner systems. In particular with a view to avoiding high retrofitting and new procurement costs, it is desirable to provide premix burners with the largest possible dimensions in order, for example, to be able to continue to operate such large dimensioned silo combustion chambers with only a single premix burner.
Theoretische Überlegungen sowie auch Versuche haben gezeigt, dass eine einfache Skalierung beispielsweise eines aus der EP 0321 809 B1 bekannten Doppelkegelbrenners nicht Ziel führend ist, zumal, wie bereits vorstehend erwähnt, die Brennerlänge überproportional ansteigen würde. Hinzukommt, dass die Breite der in der Brennerachse tangential verlaufenden Lufteintrittschlitze, durch die Verbrennungszuluft zur Erzeugung der gewünschten Drallströmung in den Drallerzeuger einströmt, ebenfalls proportional ansteigen würde, so dass eine gute Durchmischung von Brennstoff sowie Verbrenπungszuluft nicht mehr in ausreichender Qualität gewährleistet werden kann.Theoretical considerations as well as tests have shown that simple scaling, for example of a double-cone burner known from EP 0321 809 B1, does not lead to the goal, especially since, as already mentioned above, the burner length would increase disproportionately. In addition, the width of the air inlet slots running tangentially in the burner axis, through which the combustion air flows in to generate the desired swirl flow into the swirl generator, would also increase proportionally, so that good mixing of fuel and combustion air can no longer be guaranteed in sufficient quality.
Ein weiterer sehr wichtiger und zugleich auch kritischer Aspekt bei einer gewünschten Vergrößerung bzw. Leistungssteigerung der bis anhin bekannten Vormischbrennersysteme betrifft den stromabseitigen Abschluss der den Drallraum des Drallerzeugers einschließenden Teilkegelschalen, die im Beispiel des in der EP 0321 809 B1 beschriebenen Doppeikegelbrenners in axialwärts gerichtete Versperrungen enden. Diese Versperrungen tragen zur Ausbildung unerwünschter Ablösewirbel bei, die als kohärente Wirbelstrukturen zu Verbrennungsinstabilitäten und damit verbunden zu thermoakustischen Schwingungen bzw. Pulsationen führen. Auch sind Vormischbrenneranordnungen bekannt (z.B. US 5,588,826), die im Unterschied zum vorstehend beschriebenen Vormischbrenner eine zwischen dem Drallerzeuger und der Brennkammer zwischengeschaltete Übergangsgeometrie aufweisen, beispielsweise in Form eines hohlzylindrisch ausgebildeten Mischrohrs. Derartige Übergangsgeometrien sind jedoch aerodynamisch äußerst sensibel, da Strömungsablösungen in dieser Zone zum Flammenrückschlag oder zur Selbstzündung führen können. Ebenso tragen derartige Übergangsgeometrien aufgrund ihrer aufwendigen Fertigung entscheidend zu den Herstellungskosten bei.Another very important and at the same time critical aspect in the case of a desired increase or increase in performance of the previously known premix burner systems relates to the downstream end of the partial cone shells which enclose the swirl chamber of the swirl generator and which, in the example of the double-cone burner described in EP 0321 809 B1, end in axially directed obstructions , These blockages contribute to the formation of undesired detachment vortices, which, as coherent vortex structures, lead to combustion instabilities and, as a result, to thermoacoustic vibrations or pulsations. Premix burner arrangements are also known (for example US 5,588,826) which, in contrast to the premix burner described above, have a transition geometry interposed between the swirl generator and the combustion chamber, for example in the form of a hollow cylindrical mixing tube. However, such transition geometries are extremely aerodynamically sensitive, since flow separations in this zone can lead to a flashback or self-ignition. Such transition geometries also make a decisive contribution to the production costs due to their complex production.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt die Aufgabe zugrunde einen Vormischbrenner gemäß den Merkmalen des Oberbegriffes des Anspruches 1 derart weiterzubilden, dass trotz Vergrößerung der Brennerdimensionen die bei bisher bekannten Vormischbrennem optimierten Brennereigenschaften nahezu unverändert erhalten bleiben sollen. So gilt es, die Brennergröße von bis anhin bekannten Vormischbrennersystemen zu vergrößern, um die Brenneranzahl bei Mehrfachbrenneranordnungen, wie eingangs beschrieben, sowie auch die damit verbundenen Systemkosten zu reduzieren. Ebenso soll es mit den größer bauenden Vormischbrennersystemen möglich sein, bis anhin bekannte Diffusions-Einzelbrenner, wie sie sich beispielsweise zur Befeuerung von Silobrennkammern im Einsatz befinden, durch einen einzigen Vormischbrenner zu ersetzen.The invention is based on the object of developing a premix burner in accordance with the features of the preamble of claim 1 in such a way that, despite enlarging the burner dimensions, the burner properties which have been optimized in previously known premix burners are to be maintained almost unchanged. It is therefore necessary to increase the burner size of previously known premix burner systems in order to reduce the number of burners in multiple burner arrangements, as described at the beginning, and also to reduce the system costs associated therewith. It should also be possible with the larger premix burner systems to replace previously known diffusion single burners, such as those used for firing silo combustion chambers, by a single premix burner.
Die Lösung der der Erfindung zugrunde liegenden Aufgabe ist im Anspruch 1 angegeben. Den Erfindungsgedanken vorteilhaft weiterbildende Merkmale sind Gegenstand der Unteransprüche sowie der Beschreibung insbesondere unter Bezugnahme auf die Ausführungsbeispiele zu entnehmen.The solution to the problem on which the invention is based is specified in claim 1. Features which advantageously further develop the inventive concept are the subject matter of the subclaims and the description, in particular with reference to the exemplary embodiments.
Erfindungsgemäß ist ein Vormischbrenner gemäß dem Oberbegriff des Anspruches 1 derart weitergebildet, dass zumindest am stromabseitigen Endbereich des Drallerzeugers ein die Teilkegelschalen umschließendes Formelement mit einer den Teilkegelschalen zugewandten Innenwand vorgesehen ist, und dass die Teilkegelschalen formerhaltend in die Innenwand bündig auslaufen.According to the invention, a premix burner is developed in such a way that, at least at the downstream end region of the swirl generator, a shaped element enclosing the partial cone shells with a Partial conical shells facing inner wall is provided, and that the partial conical shells run out flush with the shape of the inner wall.
Eine Vielzahl theoretischer Überlegungen sowie auch experimentell durchgeführter Versuche die bis anhin bekannte Bauform von Vormischbrennem, die üblicherweise einen maximalen brenneraustrittsseitigen Brennerdurchmesser von 180 mm aufweisen, zu vergrößern, führte zu der Erkenntnis, dass die stromabseitige Endstruktur der Teilkegelschalen einen wesentlichen Einfluss auf die Stabilität der sich ausbildenden Vormischbrennerflamme hat, insbesondere im Bestreben, den Vormischbrenner möglichst großvolumig auszubilden.A large number of theoretical considerations, as well as experiments carried out experimentally, to enlarge the previously known design of premix burners, which usually have a maximum burner outlet-side burner diameter of 180 mm, led to the realization that the downstream end structure of the partial cone shells has a significant influence on the stability of the forming premix burner flame, in particular in the endeavor to make the premix burner as large as possible.
So zeigt sich, dass in den meisten Fällen der im Einsatz befindlichen Vormischbrenner die Endbereiche der Teilkegelschalen in Strömungsrichtung in einen hohlzylinderförmigen Strömungskanal übergehen, an den sich entweder direkt die Brennkammer oder eine zusätzliche Mischstrecke in Form eines Mischrohres anschließt. Zur Vermeidung der in Strömungsrichtung sich unmittelbar an den Teilkegelschalen anschließenden Ablösewirbel ist erfindungsgemäß erkannt worden, dass sich die Drallströmung unmittelbar nach Austritt aus dem Drallerzeuger weitgehend ohne InStabilisierung der Drallströmung auszubreiten vermag, wenn die einzelnen Teilkegelschalen formerhaltend mit der Innenwand des sich an dem Drallerzeuger anschließenden Strömungskanals anschmiegen. Der Begriff „formerhaltend" bedeutet im erfindungsgemäßen Sinne, dass die teilkegelartig ausgebildete Form der Teilkegelschalen im Bereich des in Berührung Tretens mit der Innenwand des die Teilkegelschalen umschließenden Formelementes unverändert bleibt, als würden die Teilkegelschalen das Formelement radialwärts nach aussen ungehindert durchdringen.This shows that in most cases of the premixing burners in use, the end regions of the partial cone shells merge into a hollow cylindrical flow channel in the flow direction, which is either directly connected to the combustion chamber or an additional mixing section in the form of a mixing tube. In order to avoid the swirling vortices directly adjoining the partial cone shells in the direction of flow, it has been recognized according to the invention that the swirl flow is able to spread directly after exiting the swirl generator largely without the swirl flow becoming unstabilized, if the individual partial cone shells retain their shape with the inner wall of the flow duct adjoining the swirl generator nestle. In the sense of the invention, the term “shape-preserving” means that the part-conical shape of the partial cone shells remains unchanged in the region of contact with the inner wall of the shaped element surrounding the partial cone shells, as if the partial cone shells penetrated the shaped element radially outward unhindered.
Zur Ausbildung eines stromab an die Teilkegelschalen anschließenden Strömungskanals dient im weiteren die Innenwand des Formelementes. Je nach Form und Größe des Formelementes dient dieses im weiteren als Mischrohr oder als Fügeelement, im Sinne eines Flanschstückes, über das der Drallerzeuger mit einer in Strömungsrichtung nachfolgenden Brennkammer, wie beispielsweise eine Silobrennkammer, oder eine andere Kanalstruktur verbindbar ist.The inner wall of the shaped element also serves to form a flow channel downstream of the partial cone shells. Depending on the shape and size of the shaped element, this is also used as a mixing tube or as a joining element, in the sense of a flange piece, by means of which the swirl generator is connected to an in Direction of flow downstream combustion chamber, such as a silo combustion chamber, or another channel structure can be connected.
Um den Vormischbrenner möglichst kompakt, d.h. mit einer möglichst geringen Brennerlänge realisieren zu können, werden Kegelwinkel von wenigstens 11°, vorzugsweise jedoch im Bereich von 20° und größer eingesetzt, unter denen die Teilkegelschalen den Drallraum konisch erweiternd umgeben. So lassen sich Brenner mit einem Brennerdurchmesser im Austrittsbereich von beispielsweise größer 500 mm ermöglichen, die eine Brennerlänge deutlich unter einem Meter aufweisen. Zur Gewährleistung einer guten Durchmischung des Brennstoffluftgemisches innerhalb des Drallerzeugers ist es überdies vorteilhaft, die Anzahl der Teilkegelschalen und damit verbunden die Anzahl der Lufteinstrittsschlitze zu erhöhen, um somit eine möglichst geringe Schlitzweite pro Lufteintrittsschlitz zu erzielen.To make the premix burner as compact as possible, i.e. To be able to achieve the smallest possible burner length, cone angles of at least 11 °, but preferably in the range of 20 ° and larger, are used, under which the partial cone shells surround the swirl space in a conically widening manner. This enables burners with a burner diameter in the outlet area of, for example, greater than 500 mm to be made possible, which have a burner length well below one meter. To ensure thorough mixing of the fuel-air mixture within the swirl generator, it is also advantageous to increase the number of partial cone shells and the associated number of air inlet slots in order to achieve the smallest possible slot width per air inlet slot.
Kurze Beschreibung der ErfindungBrief description of the invention
Die Erfindung wird nachstehend ohne Beschränkung des allgemeinen Eriϊndungsgedankens anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnungen exemplarisch beschrieben. Es zeigen:The invention is described below by way of example with reference to the drawings, without restricting the general idea of the invention. Show it:
Fig. 1 + 2 perspektivische Darstellung eines Vormischbrenners mit einem zylinderförmig ausgebildeten Formelement,1 + 2 perspective view of a premix burner with a cylindrical shaped element,
Fig. 3 + 4 perspektivische Darstellung eines Vormischbrenners mit einem kegelstumpfförmig ausgebildeten Formelement,3 + 4 perspective view of a premix burner with a frustoconical shaped element,
Fig. 5 Schnittdarstellung durch einen Vormischbrenner mit einem kegelstumpfförmig ausgebildeten Formelement sowieFig. 5 sectional view through a premix burner with a frustoconical shaped element and
Fig. 6 + 7 perspektivische Darstellung eines Vormischbrenners mit einem einen trichterförmig ausgebildeten Eintrittsbereich aufweisenden Formelement. Wege zur Ausführung der Erfindung, gewerbliche VerwendbarkeitFig. 6 + 7 perspective view of a premix burner with a funnel-shaped inlet area having a shaped element. WAYS OF IMPLEMENTING THE INVENTION, INDUSTRIAL APPLICABILITY
In Fig.1 ist eine perspektivische Darstellung eines Vormischbrenners gezeigt, mit Blickrichtung von der stromabwärtigeπ Seite in den durch eine Vielzahl von Teilkegelschalen 1 umspannten Drallraum eines Drallerzeugers 2 hinein. Fig. 2 zeigt den gleichen Vormischbrenner, jedoch unter einem anderen Blickwinkel, nämlich von außen auf den Drallerzeuger 2, der im dargestellten Ausführungsbeispiel von acht Teilkegelschalen 1 umspannt wird. Die weiteren Außenführungen bezüglich des in den Fig. 1 und 2 dargestellten Ausführungsbeispieles erfolgen einheitlich, so dass im Weiteren keine Unterscheidung zwischen Fig. 1 und Fig. 2 getroffen wird.1 shows a perspective illustration of a premix burner, looking in the direction from the downstream side into the swirl space of a swirl generator 2 spanned by a plurality of partial cone shells 1. 2 shows the same premix burner, but from a different angle, namely from the outside onto the swirl generator 2, which is spanned by eight partial cone shells 1 in the exemplary embodiment shown. The further external guides with respect to the exemplary embodiment shown in FIGS. 1 and 2 are made uniformly, so that no further distinction is made between FIGS. 1 and 2.
Der dargestellte Vormischbrenner weist eine mittige, in Form einer Aufnahmehüise ausgebildete Aufnahmeeinheit 3 auf, die für einen Einschub sowie Halterung einer zentralen Brennstoffzuführeinheit, bspw. in Form einer Brennstoffdüse für flüssige Brennstoffe oder Breπnlanze für eine Pilotflamme (nicht dargestellt) vorgesehen ist. Die mit ihren stromaufseitigen Enden mit der Aufnahmeeinheit 3 verbundenen Teilkegelschalen 1 schließen gegenseitig Lufteintrittsschlitze 4 ein und sind gegenüber einer mittig durch den Vormischbrenner verlaufenden Brennerachse A derart angestellt, dass sie einen in Strömungsrichtung unter einem Kegelwinkel y sich konisch erweiternden Drallraum begrenzen. Jede einzelne Teilkegelschale 1 weist überdies, je nach Brennstoffart mindestens eine Brennstoffzuleitung 5 auf, über die in den durch die Lufteintrittsschlitze 2 hindurch tretenden Verbrennungszuluftstrom Brennstoff beigemischt werden kann.The premix burner shown has a central receiving unit 3, which is designed in the form of a receiving sleeve and is provided for inserting and holding a central fuel supply unit, for example in the form of a fuel nozzle for liquid fuels or a fuel lance for a pilot flame (not shown). The partial cone shells 1 connected with their upstream ends to the receiving unit 3 mutually enclose air inlet slots 4 and are positioned relative to a burner axis A running centrally through the premix burner in such a way that they limit a swirl space that widens conically in the direction of flow at a cone angle y. Each individual partial cone shell 1 also has, depending on the type of fuel, at least one fuel feed line 5, via which fuel can be mixed into the combustion air supply stream passing through the air inlet slots 2.
Die einzelnen Teilkegelschalen 1 münden mit ihrem stromab gewandten Ende formerhaltend an einer Innenwand 6 eines die Teilkegelschalen 1 umgebenden, zylindrisch ausgebildeten Formelementes 7. Die einzelnen Teilkegelschalen 1 sind mit der Innenwand 6 des Formelementes 7 längs einer Schnittlinie 8 verbunden, die sich durch eine virtuelle Durchdringung jeder einzelnen Teilkegelschale 1 mit der Innenwand 6 des zylinderförmigen Formelementes 7 ergibt. Auf diese Weise erfährt die im Inneren des Drallerzeugers 2 gebildete Drallströmung keinerlei Störung nach Überströmen der einzelnen Teilkegelschalen 1. Stromauf zum Formelement 7 ist zu Zwecken eines verbesserten Zuluftstromes durch die Lufteintrittsschlitze 4 des Drallerzeugers 2 ein zweites Formelement 9 vorgesehen, das gleichfalls hohlzylinderförmig ausgebildet ist und über einen größeren Innendurchmesser verfügt, als das erste Formelemente 7. Der Innendurchmesserübergang zwischen den Formelementen 7 und 9 erfolgt über eine unstetige Stufe 10, an der im übrigen die Brennstoffzuleitungen 5 jeder einzelnen Teilkegelschale 1 angrenzen.The individual partial cone shells 1 open with their downstream end to maintain shape on an inner wall 6 of a cylindrical shaped element 7 surrounding the partial conical shells 1. The individual partial cone shells 1 are connected to the inner wall 6 of the shaped element 7 along a cutting line 8, which is defined by a virtual penetration each individual partial cone shell 1 with the inner wall 6 of the cylindrical shaped element 7 results. In this way, the swirl flow formed in the interior of the swirl generator 2 does not experience any disturbance after overflowing the individual partial cone shells 1. Upstream of the shaped element 7, for the purpose of an improved supply air flow through the air inlet slots 4 of the swirl generator 2, a second shaped element 9 is provided, which is also hollow-cylindrical and has a larger inner diameter than the first shaped elements 7. The inner diameter transition between the shaped elements 7 and 9 takes place via a discontinuous stage 10, on which the fuel supply lines 5 of each individual partial cone shell 1 adjoin.
Die stromabseitige Kontur des Formelementes 7 ist zylinderförmig ausgebildet und bietet die Möglichkeit einer konstruktiv einfachen Verbindung beispielsweise mit einer in Strömungsrichtung dem dargestellten Vormischbrenner nach geordneten Brennkammer (nicht dargestellt).The downstream contour of the shaped element 7 is cylindrical and offers the possibility of a structurally simple connection, for example with a combustion chamber (not shown) arranged according to the premix burner shown in the flow direction.
In den Fig. 3 und 4 ist in perspektivischer Darstellung ein weiteres Ausführungsbeispiel eines erfindungsgemäß ausgebildeten Vormischbrenners gezeigt, bei dem im Unterschied zum Ausführungsbeispiel, das in den Fig. 1 und 2 dargestellt ist, der Bereich des Formelementes 7 als sich in Strömungsrichtung konisch verjüngender Kegelstumpfabschnitt ausgebildet ist. Auf die Beschreibung der bereits eingeführten Bezugszeichen wird, um Wiederholungen zu vermeiden, verzichtet. Das in den Fig. 3 und 4 dargestellte Ausführungsbeispiel weist im Bereich des Formelementes 7 eine in den perspektivischen Darstellungen schraffiert dargestellte Innenwand 6 auf, an der die stromabseitigen Enden der Teilkegelschalen 1 formerhaltend angrenzen. An die Innenwand 6 des Formelementes 7 grenzt stromabwärtig ein hohlzylinderförmig ausgebildetes Formelement 11 an, das als Koppel- oder Flanschstück für eine nachfolgende Brennkammer dient. Durch die gegenüber den Teilkegelschalen 1 angestellte Innenwand 6 sind die Schnittlinien 8 der Teilkegelschalen 1, mit denen sie an die Innenwand 6 angrenzen kleiner bzw. in Strömungsrichtung kürzer als im Falle des vorstehenden Ausführungsbeispiels, bei dem die Teilkegelschalen längs einer koaxial zur Brennerachse gerichteten zylinderförmig ausgebildeten Innenwand angrenzen. Eine zeichnerische Querschnittsdarstellung der in den Fig. 3 und 4 gezeigten Ausführungsform ist in Fig. 5 ersichtlich. Deutlich zu erkennen ist das formerhaltende Angrenzen jeder einzelnen Teilkegelschalen 1 an die Innenwand 6 des kegelförmig in Strömungsrichtung konisch verjüngenden Formelementes 7, das in Strömungsrichtung in einen geradzylinderförmigen Bereich 11 übergeht.3 and 4 show a perspective view of a further embodiment of a premix burner designed according to the invention, in which, in contrast to the embodiment shown in FIGS. 1 and 2, the area of the shaped element 7 as a truncated cone section which tapers conically in the direction of flow is trained. In order to avoid repetition, the description of the reference symbols already introduced is omitted. The exemplary embodiment shown in FIGS. 3 and 4 has in the region of the shaped element 7 an inner wall 6 shown hatched in the perspective representations, on which the downstream ends of the partial cone shells 1 adjoin in a shape-maintaining manner. A hollow cylindrical shaped element 11, which serves as a coupling or flange piece for a subsequent combustion chamber, adjoins the inner wall 6 of the shaped element 7 downstream. Due to the inner wall 6 positioned in relation to the partial cone shells 1, the cutting lines 8 of the partial cone shells 1, with which they adjoin the inner wall 6, are smaller or shorter in the flow direction than in the case of the above exemplary embodiment, in which the partial cone shells are cylindrical in shape along a coaxial to the burner axis Adjoin the inside wall. A cross-sectional drawing of the embodiment shown in FIGS. 3 and 4 can be seen in FIG. 5. The shape-preserving abutment of each individual partial cone shell 1 on the inner wall 6 of the shaped element 7, which tapers conically in the flow direction and transitions into a straight-cylindrical region 11 in the flow direction, can be clearly seen.
In den Figuren 6 und 7 ist ein weiteres Ausführungsbeispiel für einen Vormischbrenner abgebildet mit einem Formelement 7, das einen stromaufwärtigen Bereich, den so genannten Einströmbereich 12 vorsieht, der eine sich in Strömungsrichtung trichterförmig verjüngende Innenwand 6 aufweist. Die Krümmung der Innenwand 6 in diesem Einströmbereich 12 entspricht in etwa der Kontur einer Viertelellipse. In Strömungsrichtung an den Einströmbereich 12 schließt sich im Rahmen des Formelementes 7 ein Strömungsbereich 12' mit einem weitgehend konstanten Strömungsquerschnitt an, an den letztlich ein Eintritteflansch einer Brennkammer anbringbar ist (nicht dargestellt). Wie auch in den vorstehend beschriebenen Varianten laufen die Teilkegelschalen 1 des Drallerzeugers 2 unter Beibehaltung ihrer Teilkegelschalenform bündig in die angrenzende Innenwand 6 des Formelementes 7 aus, als würden die Teilkegelschalen die Innenwand 6 ungehindert durchdringen, die Teilkegelschalen 1 schließen jedoch jeweils über die Schnittlinien 8 an der Innenwand 6 ab. Im Falle des als Viertelellipse ausgebildeten Einströmbereiches 12 schmiegen sich die stromabwärtigen Endbereiche der Teilkegelschalen 1 an die Ellipsenkrümmung der Innenwand 6 in diesem Bereich 12 an. Auf die Bedeutung der bereits eingeführten Bezugszeichen, die in den Figuren 6 und 7 zusätzlich vorgesehen sind, wird auf die vorstehenden Figuren verwiesen.FIGS. 6 and 7 show a further exemplary embodiment of a premix burner with a shaped element 7 which provides an upstream region, the so-called inflow region 12, which has an inner wall 6 which tapers in the direction of the flow in a funnel shape. The curvature of the inner wall 6 in this inflow region 12 corresponds approximately to the contour of a quarter ellipse. In the flow direction to the inflow region 12, a flow region 12 ′ adjoins within the frame of the shaped element 7 with a largely constant flow cross section, to which an inlet flange of a combustion chamber can ultimately be attached (not shown). As in the variants described above, the partial cone shells 1 of the swirl generator 2 run flush with the adjacent inner wall 6 of the shaped element 7 while maintaining their partial cone shell shape, as if the partial cone shells penetrated the inner wall 6 unhindered, but the partial cone shells 1 each connect via the cutting lines 8 the inner wall 6 from. In the case of the inflow region 12 designed as a quarter ellipse, the downstream end regions of the partial cone shells 1 nestle against the ellipse curvature of the inner wall 6 in this region 12. Reference is made to the above figures for the meaning of the reference symbols already introduced, which are additionally provided in FIGS. 6 and 7.
Die erfindungsgemäße Verbindung jeder einzelnen Teilkegelschale mit ihrem stromabseitigen Endbereich formerhaltend mit einer Innenwand eines die Teilkegelschalen umgebenden Formelementes führt zu einer geringsten Irritation der die Teilkegelschalen durchsetzenden Drallströmung. Im Unterschied zu den bis anhin bekannten Vormischbrennem sind keinerlei Versperrwirkungen in axialer Richtung durch die Brennerachse mit dem erfindungsgemäßen, formerhaltenden Auslaufen der Teilkegelschalen in die entsprechende Innenwand verbunden. The connection according to the invention of each individual partial cone shell with its downstream end region maintaining shape with an inner wall of a shaped element surrounding the partial cone shells leads to the slightest irritation of the swirl flow passing through the partial cone shells. In contrast to the previously known premix burners, there are no blocking effects in the axial direction Direction connected by the burner axis with the shape-retaining runout of the partial cone shells according to the invention into the corresponding inner wall.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
TeilkegelschalenCone shell
Drallerzeugerswirl generator
Aufnahmeeinheitrecording unit
LufteintrittsschlitzeAir inlet slots
BrennstoffzufuhrleitungFuel supply line
Innenwandinner wall
Formelementforming element
Schnittebenecutting plane
Formelementforming element
Stufe hohlzylinderförmig ausgebildetes FormelementStep hollow cylindrical shaped element
Einströmbereich inflow

Claims

Patentansprüche claims
1. Vormischbrenner zum Betreiben einer Brennkammer mit einem gasförmigen und/oder flüssigen Brennstoff mit einem Drallerzeuger (2) für einen Verbrennungszuluftstrom zur Ausbildung einer Drallströmung sowie Mitteln (5) zur Eindüsung von Brennstoff in die Drallströmung, wobei der Drallerzeuger (2) wenigstens zwei sich zu einem Strömungskörper ergänzende Teilkegelschalen (1) aufweist, die gemeinsam einen kegelförmig ausgebildeten Drallraum mit einem Kegelwinkel y sowie in Kegellängserstreckung tangentiale Lufteintrittsschlitze (4) einschließen, dadurch gekennzeichnet, dass zumindest am stromabseitigen Endbereich des Drallerzeugers (2) ein die Teilkegelschalen (1 ) umschließendes Formelement (7) mit einer den Teilkegelschalen (1) zugewandten Innenwand (6) vorgesehen ist, und dass die Teilkegelschalen (1) formerhaltend in die Innenwand (6) bündig auslaufen.1. premix burner for operating a combustion chamber with a gaseous and / or liquid fuel with a swirl generator (2) for a combustion supply air flow to form a swirl flow and means (5) for injecting fuel into the swirl flow, the swirl generator (2) being at least two Partial conical shells (1) complementing a flow body, which together enclose a conical swirl chamber with a conical angle y and tangential air inlet slots (4) in the longitudinal direction of the cone, characterized in that at least on the downstream end region of the swirl generator (2) encloses the partial conical shells (1) Shaped element (7) with an inner wall (6) facing the partial cone shells (1) is provided, and that the partial cone shells (1) end flush into the inner wall (6) in a shape-retaining manner.
2. Vormischbrenner nach Anspruch 1 , dadurch gekennzeichnet, dass das Formelement (7) die Teilkegelschalen (1) an ihrem stromabseitigen Endbereich ringartig derart umschließt, dass die Innenwand (6) des Formelementes (7) jeweils über eine Schnittlinie (8) durch die jeweilige Teilkegelschale (1), welche längs der die Teilkegelschale (1) die Innenwand (6) virtuell formerhaltend durchdringt, mit dieser verbunden ist.2. premix burner according to claim 1, characterized in that the shaped element (7) surrounds the partial cone shells (1) at their downstream end region in a ring-like manner such that the inner wall (6) of the shaped element (7) each has a cutting line (8) through the respective Partial cone shell (1), which along which the partial cone shell (1) penetrates the inner wall (6) virtually in a shape-retaining manner, is connected to the latter.
3. Vormischbrenner nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Innenwand (6) kegelsstumpfartig ausgebildet ist und eine sich in Strömungsrichtung konisch verjüngende Kontur aufweist.3. premix burner according to claim 1 or 2, characterized in that the inner wall (6) is frustoconical and has a tapered contour in the flow direction.
4 Vormischbrenner nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Innenwand (6) unmittelbar stromab am Drallerzeuger (2) angrenzend einen Einströmbereich (12) aufweist, in dem die Innenwand (6) in Strömungsrichtung trichterförmig verjüngend ausgebildet ist. 4 premix burner according to claim 1 or 2, characterized in that the inner wall (6) immediately downstream of the swirl generator (2) adjacent an inflow region (12) in which the inner wall (6) is funnel-shaped in the direction of flow.
5. Vormischbrennem nach Anspruch 4, dadurch gekennzeichnet, dass die Innenwand (6) im Einströmbereich (12) eine im Längsschnitt als Viertelellipse ausgebildete Krümmungskontur aufweist.5. premix burner according to claim 4, characterized in that the inner wall (6) in the inflow region (12) has a curvature contour formed in longitudinal section as a quarter ellipse.
6. Vormischbrennem nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass stromab am Einströmbereich (12) die Innenwand (6) in einen Strömungsabschnitt (12') übergeht, der über einen in Strömungsrichtung gleich bleibenden Strömungsquerschnitt verfügt.6. premix burner according to claim 4 or 5, characterized in that downstream of the inflow region (12) the inner wall (6) merges into a flow section (12 ') which has a flow cross-section which remains constant in the flow direction.
7. Vormischbrenner nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Innenwand (6) zylinderförmig ausgebildet ist.7. premix burner according to claim 1 or 2, characterized in that the inner wall (6) is cylindrical.
8. Vormischbrenner nach Anspruch 3 oder 7, dadurch gekennzeichnet, dass sich in Strömungsrichtung ein weiteres Formelement (11) an das erste Formelement (7) anschließt mit einerweiteren Innenwand, die axialwärts über einen konstanten Strömungsquerschnitt verfügt.8. premix burner according to claim 3 or 7, characterized in that in the flow direction a further shaped element (11) adjoins the first shaped element (7) with a further inner wall which has a constant flow cross-section axially.
9. Vormischbrenner nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass der Kegelwinkel y größer 11°, vorzugsweise größer 20 ° ist.9. premix burner according to one of claims 1 to 10, characterized in that the cone angle y is greater than 11 °, preferably greater than 20 °.
10. Vormischbrenner nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass wenigstens vier, vorzugsweise acht, Teilkegelschalen (1) zur Ausbildung des Drallraumes vorgesehen sind.10. premix burner according to one of claims 1 to 9, characterized in that at least four, preferably eight, partial cone shells (1) are provided to form the swirl chamber.
11. Vormischbrenner nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass der Drallerzeuger (2) einen stromabseitigen Brennerdurchmesser von größer 180 mm aufweist.11. premix burner according to one of claims 1 to 10, characterized in that the swirl generator (2) has a downstream burner diameter of greater than 180 mm.
12. Verwendung des Vormischbrenners nach einem der Ansprüchen 1 bis 12 zur Befeuerung einer Silobrennkammer. 12. Use of the premix burner according to one of claims 1 to 12 for firing a silo combustion chamber.
EP05726413A 2004-02-12 2005-02-09 Premixing burner arrangement for operating a burner chamber and method for operating a burner chamber Not-in-force EP1714081B1 (en)

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EP2703721A1 (en) 2012-08-31 2014-03-05 Alstom Technology Ltd Premix burner

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Publication number Priority date Publication date Assignee Title
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DE502005003648D1 (en) 2008-05-21
ATE391887T1 (en) 2008-04-15
CN1942710A (en) 2007-04-04
MXPA06008994A (en) 2006-12-14
WO2005078348A1 (en) 2005-08-25
EP1714081B1 (en) 2008-04-09
CA2555481A1 (en) 2005-08-25
BRPI0507640A (en) 2007-07-10
MY141577A (en) 2010-05-14
US20070042307A1 (en) 2007-02-22

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